"use client";

import Link from "next/link";
import { useRouter, useSearchParams } from "next/navigation";
import { Suspense, use, useState } from "react";
import {
  AlertTriangle,
  Check,
  CheckCheck,
  ChevronDown,
  ChevronRight,
  Loader2,
  Plus,
  RefreshCw,
} from "lucide-react";
import { CompanyPillLink } from "@/components/ui/company-pill";
import { CopyableEmail } from "@/components/ui/copyable-email";
import { CompanyStatusBadge, SeverityBadge } from "@/components/ui/badge";
import { NotificationChannelBox } from "@/components/ui/notification-channel-box";
import { Select } from "@/components/ui/select";
import { useAlerts, useMarkAlertRead, useResolveAlert } from "@/hooks/use-alerts";
import { useSystemStatus } from "@/hooks/use-auth";
import {
  useCompanies,
  useCompany,
  useDeleteCompany,
  useRefreshEnrichmentSection,
  useSetCompanyPaused,
  useUpdateMonitorConfiguration,
} from "@/hooks/use-companies";
import { useNotificationDestinations } from "@/hooks/use-notification-destinations";
import {
  useCreateSource,
  useDeleteSource,
  useSources,
  useTestSource,
  useUpdateSource,
} from "@/hooks/use-sources";
import { useCompanyRuns, useRunCompanyNow } from "@/hooks/use-monitoring-runs";
import { useCompanyReports, useGenerateReport } from "@/hooks/use-reports";
import { useSnapshots } from "@/hooks/use-snapshots";
import type { EnrichmentSection, MonitoringFrequency } from "@/lib/types";
import {
  FREQUENCY_LABELS,
  MONITORING_FREQUENCIES,
  SEVERITY_LABELS,
  SEVERITY_LEVELS,
} from "@/lib/types";
import {
  companyNameFromUrl,
  formatDateTime,
  formatEnrichmentReason,
  formatMoney,
  formatRelative,
  summarizeEnrichmentError,
} from "@/lib/format";

const TABS = [
  "Overview",
  "Enrichment",
  "Latest report",
  "Alerts",
  "Sources",
  "Monitoring history",
  "Snapshots",
  "Configuration",
] as const;
type Tab = (typeof TABS)[number];

const TAB_DESCRIPTIONS: Record<Tab, string> = {
  Overview: "A snapshot of this company — description, competitors, key details, and its monitoring schedule.",
  Enrichment: "Rich company data — funding, leadership, products, and customers.",
  "Latest report":
    "The most recent AI-generated competitive intelligence report, grounded in everything collected so far.",
  Alerts:
    "Notable changes detected for this company, ranked by severity, with actions to mark them read or resolved.",
  Sources: "Every data source being monitored for this company, and how often each one is checked.",
  "Monitoring history":
    "A log of every monitoring run for this company — what it collected and whether it succeeded.",
  Snapshots:
    "The raw content collected from each source on each run, so you can see exactly what was captured.",
  Configuration: "Scheduling, severity threshold, and notification settings for this company.",
};

function charCount(text: string | null): string {
  return `${(text ?? "").length.toLocaleString()} chars`;
}

const RUN_STATUS_CLASSES: Record<string, string> = {
  queued: "bg-slate-100 text-slate-700",
  running: "bg-blue-100 text-blue-700",
  successful: "bg-green-100 text-green-700",
  partial: "bg-amber-100 text-amber-700",
  failed: "bg-red-100 text-red-700",
};

const ERROR_TONE_CLASSES = {
  amber: {
    box: "border-amber-200 bg-amber-50 text-amber-800",
    button: "border-amber-300 text-amber-800 hover:bg-amber-100",
  },
  red: {
    box: "border-red-200 bg-red-50 text-red-800",
    button: "border-red-300 text-red-800 hover:bg-red-100",
  },
} as const;

function EnrichmentErrorSummary({
  tone,
  summary,
  errors,
}: {
  tone: keyof typeof ERROR_TONE_CLASSES;
  summary: string;
  errors: Record<string, string>;
}) {
  const [expanded, setExpanded] = useState(false);
  const sections = Object.entries(errors);
  const classes = ERROR_TONE_CLASSES[tone];

  return (
    <div className={`rounded-lg border p-4 text-sm ${classes.box}`}>
      <div className="flex items-start justify-between gap-3">
        <p>{summary}</p>
        {sections.length > 0 && (
          <button
            type="button"
            onClick={() => setExpanded((e) => !e)}
            className={`focus-ring shrink-0 whitespace-nowrap rounded-md border bg-white/60 px-2 py-1 text-xs font-medium transition-colors duration-200 ${classes.button}`}
          >
            {expanded ? "Hide details" : "View details"}
          </button>
        )}
      </div>
      <div
        className={`grid transition-[grid-template-rows] duration-300 ease-out ${expanded ? "grid-rows-[1fr] mt-3" : "grid-rows-[0fr]"}`}
      >
        <div className="overflow-hidden">
          <ul className="space-y-2 border-t border-current/20 pt-3 text-xs">
            {sections.map(([section, raw]) => (
              <li key={section}>
                <p className="font-medium">{section}</p>
                <p className="mt-0.5 opacity-80">{summarizeEnrichmentError(raw)}</p>
                <pre className="mt-1 whitespace-pre-wrap break-words opacity-60">{raw}</pre>
              </li>
            ))}
          </ul>
        </div>
      </div>
    </div>
  );
}

function RefreshSectionButton({
  section,
  label,
  mutation,
}: {
  section: EnrichmentSection;
  label: string;
  mutation: ReturnType<typeof useRefreshEnrichmentSection>;
}) {
  const isRefreshing = mutation.isPending && mutation.variables === section;
  return (
    <button
      type="button"
      onClick={() => mutation.mutate(section)}
      disabled={isRefreshing}
      title={`Re-fetch ${label} from NinjaPear`}
      className="focus-ring mt-2 inline-flex items-center gap-1.5 rounded-md border border-slate-300 px-2 py-1 text-xs font-medium text-slate-700 transition-colors duration-150 hover:bg-slate-50 disabled:opacity-60"
    >
      <RefreshCw className={`h-3 w-3 ${isRefreshing ? "animate-spin" : ""}`} aria-hidden />
      {isRefreshing ? "Refreshing…" : "Refresh"}
    </button>
  );
}

export default function CompanyDetailPage({ params }: { params: Promise<{ id: string }> }) {
  const { id } = use(params);
  return (
    <Suspense fallback={<p className="text-sm text-slate-500">Loading…</p>}>
      <CompanyDetailPageInner id={id} />
    </Suspense>
  );
}

function CompanyDetailPageInner({ id }: { id: string }) {
  const router = useRouter();
  const searchParams = useSearchParams();
  const requestedTab = searchParams.get("tab");
  const initialTab = (TABS as readonly string[]).includes(requestedTab ?? "")
    ? (requestedTab as Tab)
    : "Overview";

  const { data: company, isLoading } = useCompany(id);
  const { data: allCompanies } = useCompanies();
  const setPaused = useSetCompanyPaused();
  const deleteCompany = useDeleteCompany();
  const updateMonitor = useUpdateMonitorConfiguration(id);
  const { data: sources, isLoading: sourcesLoading } = useSources(id);
  const createSource = useCreateSource(id);
  const deleteSource = useDeleteSource(id);
  const testSource = useTestSource(id);
  const updateSource = useUpdateSource(id);
  const refreshEnrichmentSection = useRefreshEnrichmentSection(id);
  const { data: runs, isLoading: runsLoading } = useCompanyRuns(id);
  const runNow = useRunCompanyNow(id);
  const { data: reports, isLoading: reportsLoading } = useCompanyReports(id);
  const generateReport = useGenerateReport(id);
  const { data: snapshots, isLoading: snapshotsLoading } = useSnapshots(id);
  const { data: alerts, isLoading: alertsLoading } = useAlerts({ company_id: id });
  const markAlertRead = useMarkAlertRead();
  const resolveAlert = useResolveAlert();
  const { data: notificationDestinations } = useNotificationDestinations();
  const { data: systemStatus } = useSystemStatus();
  const [tab, setTab] = useState<Tab>(initialTab);
  const [confirmingDelete, setConfirmingDelete] = useState(false);
  const [newSourceName, setNewSourceName] = useState("");
  const [newSourceUrl, setNewSourceUrl] = useState("");
  const [testResults, setTestResults] = useState<Record<string, string>>({});
  const [expandedSnapshots, setExpandedSnapshots] = useState<Set<string>>(new Set());
  const [frequencyOverride, setFrequencyOverride] = useState<string | null>(null);
  const [severityOverride, setSeverityOverride] = useState<string | null>(null);

  if (isLoading) {
    return <p className="text-sm text-slate-500">Loading…</p>;
  }

  if (!company) {
    return <p className="text-sm text-slate-500">Company not found.</p>;
  }

  const config = company.monitor_configuration;
  // "Running" covers the whole onboarding/run chain, not just the
  // monitoring-run row itself: enrichment is a separate fire-and-forget
  // task fired at company creation, and its own tab shouldn't look done
  // (nor should Pause/Delete be usable) while it's still in flight either.
  const isRunning =
    (runs?.some((r) => r.status === "queued" || r.status === "running") ?? false) ||
    company.enrichment?.status === "pending";
  const returnTo = `/companies/${id}?tab=${encodeURIComponent(tab)}`;

  const monitoredByName = new Map(
    (allCompanies ?? [])
      .filter((c) => c.id !== company.id)
      .map((c) => [c.name.trim().toLowerCase(), c.id] as const),
  );

  const existingCompetitorKeys = new Set(company.competitors.map((c) => c.trim().toLowerCase()));
  const enrichmentCompetitors =
    (company.enrichment?.data.competitors as { name?: string }[] | undefined) ?? [];
  const suggestedCompetitors = [
    ...new Set(
      enrichmentCompetitors
        .map((c) => companyNameFromUrl((c.name ?? "").trim()))
        .filter((name) => name && !existingCompetitorKeys.has(name.toLowerCase())),
    ),
  ];

  const companyDestinations = (notificationDestinations ?? []).filter((d) =>
    d.companies.some((c) => c.id === company.id),
  );
  const emailDestination = companyDestinations.find((d) => d.type === "email");
  const smsDestination = companyDestinations.find((d) => d.type === "sms");

  return (
    <div>
      <Link href="/companies" className="text-sm text-slate-500 hover:text-slate-700">
        ← Back to companies
      </Link>

      <div className="mt-2 flex flex-wrap items-start justify-between gap-4">
        <div>
          <div className="flex items-center gap-3">
            <h1 className="text-2xl font-semibold text-slate-900">{company.name}</h1>
            <CompanyStatusBadge status={company.status} />
          </div>
          {company.official_website && (
            <a
              href={company.official_website}
              target="_blank"
              rel="noreferrer"
              className="text-sm text-brand-600 hover:text-brand-700"
            >
              {company.official_website}
            </a>
          )}
        </div>
        <div className="flex items-center gap-2">
          <button
            onClick={() => runNow.mutate()}
            disabled={runNow.isPending || isRunning}
            className={`focus-ring inline-flex items-center gap-1.5 rounded-md border px-3 py-2 text-sm font-medium transition-colors duration-200 disabled:cursor-not-allowed ${
              isRunning
                ? "border-green-700 bg-green-700 text-white"
                : "border-slate-300 text-slate-700 hover:border-green-300 hover:bg-green-50 hover:text-green-700 disabled:opacity-60"
            }`}
          >
            {isRunning && <Loader2 className="h-4 w-4 animate-spin" aria-hidden />}
            {isRunning ? "Running…" : "Run now"}
          </button>
          <button
            onClick={() =>
              setPaused.mutate({ companyId: company.id, paused: company.status === "active" })
            }
            disabled={setPaused.isPending || isRunning}
            className={`focus-ring rounded-md border border-slate-300 px-3 py-2 text-sm font-medium text-slate-700 transition-[opacity,color,background-color,border-color] duration-200 disabled:cursor-not-allowed ${
              isRunning
                ? "opacity-40"
                : "hover:border-amber-300 hover:bg-amber-50 hover:text-amber-700 disabled:opacity-60"
            }`}
          >
            <span key={company.status} className="inline-block animate-fade-in">
              {company.status === "active" ? "Pause Monitoring" : "Resume Monitoring"}
            </span>
          </button>
          <div
            className={`grid transition-[grid-template-columns] duration-200 ease-out ${
              confirmingDelete ? "grid-cols-[1fr]" : "grid-cols-[0fr]"
            }`}
          >
            <div className="overflow-hidden">
              <div
                className={`flex items-center gap-2 whitespace-nowrap text-sm transition-opacity duration-200 ${
                  confirmingDelete ? "opacity-100 delay-100" : "opacity-0"
                }`}
              >
                <span>Delete this company?</span>
                <button
                  onClick={async () => {
                    await deleteCompany.mutateAsync(company.id);
                    router.push("/companies");
                  }}
                  disabled={deleteCompany.isPending || isRunning}
                  className={`focus-ring rounded-md bg-red-600 px-3 py-2 font-semibold text-white transition-[opacity,background-color] duration-200 disabled:cursor-not-allowed ${
                    isRunning ? "opacity-40" : "hover:bg-red-700"
                  }`}
                >
                  Yes, delete
                </button>
                <button
                  onClick={() => setConfirmingDelete(false)}
                  className="focus-ring rounded-md px-3 py-2 text-slate-600 transition-colors duration-200 hover:bg-slate-100"
                >
                  Cancel
                </button>
              </div>
            </div>
          </div>
          <div
            className={`grid transition-[grid-template-columns] duration-200 ease-out ${
              confirmingDelete ? "grid-cols-[0fr]" : "grid-cols-[1fr]"
            }`}
          >
            <div className="overflow-hidden">
              <button
                onClick={() => setConfirmingDelete(true)}
                disabled={isRunning}
                className={`focus-ring whitespace-nowrap rounded-md border border-slate-300 px-3 py-2 text-sm font-medium text-red-600 transition-[opacity,color,background-color] duration-200 disabled:cursor-not-allowed ${
                  confirmingDelete
                    ? "opacity-0"
                    : isRunning
                      ? "opacity-40 delay-100"
                      : "opacity-100 delay-100 hover:bg-red-50"
                }`}
              >
                Delete
              </button>
            </div>
          </div>
        </div>
      </div>

      <div className="mt-6 border-b border-slate-200">
        <nav className="-mb-px flex flex-wrap gap-4">
          {TABS.map((t) => (
            <button
              key={t}
              onClick={() => setTab(t)}
              className={`focus-ring whitespace-nowrap border-b-2 px-1 py-2 text-sm font-medium ${
                tab === t
                  ? "border-brand-600 text-brand-600"
                  : "border-transparent text-slate-500 hover:text-slate-700"
              }`}
            >
              {t}
            </button>
          ))}
        </nav>
      </div>

      <div key={tab} className="mt-6 animate-fade-in">
        <p className="mb-4 rounded-lg border border-slate-200 bg-white p-3 text-sm text-slate-600">
          {TAB_DESCRIPTIONS[tab]}
        </p>

        {tab === "Overview" && (
          <div className="grid gap-6 lg:grid-cols-3">
            <div className="space-y-4 lg:col-span-2">
              <section className="rounded-lg border border-slate-200 bg-white p-5">
                <h2 className="text-sm font-medium text-slate-700">Monitoring focus</h2>
                <p className="mt-2 text-sm text-slate-600">
                  {company.monitoring_focus || "No specific focus provided — general monitoring."}
                </p>
              </section>
              {company.description && (
                <section className="rounded-lg border border-slate-200 bg-white p-5">
                  <h2 className="text-sm font-medium text-slate-700">Description</h2>
                  <p className="mt-2 text-sm text-slate-600">{company.description}</p>
                </section>
              )}
              <section className="rounded-lg border border-slate-200 bg-white p-5">
                <h2 className="text-sm font-medium text-slate-700">Competitors</h2>
                {company.competitors.length === 0 && suggestedCompetitors.length === 0 ? (
                  <p className="mt-2 text-sm text-slate-500">None listed.</p>
                ) : (
                  <ul className="mt-2 flex flex-wrap gap-2">
                    {company.competitors.map((c) => (
                      <li key={c}>
                        <CompanyPillLink name={c} monitoredByName={monitoredByName} returnTo={returnTo} />
                      </li>
                    ))}
                    {suggestedCompetitors.map((c) => (
                      <li key={`suggested-${c}`}>
                        <CompanyPillLink
                          name={c}
                          subtitle="suggested"
                          monitoredByName={monitoredByName}
                          returnTo={returnTo}
                        />
                      </li>
                    ))}
                  </ul>
                )}
              </section>
            </div>
            <aside className="space-y-4">
              <section className="rounded-lg border border-slate-200 bg-white p-5 text-sm">
                <h2 className="font-medium text-slate-700">Details</h2>
                <dl className="mt-3 space-y-3">
                  <div>
                    <dt className="text-xs text-slate-500">Industry</dt>
                    <dd className="mt-0.5 break-words">{company.industry || "—"}</dd>
                  </div>
                  <div>
                    <dt className="text-xs text-slate-500">Headquarters</dt>
                    <dd className="mt-0.5 break-words">{company.headquarters || "—"}</dd>
                  </div>
                  <div>
                    <dt className="text-xs text-slate-500">Country</dt>
                    <dd className="mt-0.5 break-words">{company.country || "—"}</dd>
                  </div>
                  <div>
                    <dt className="text-xs text-slate-500">Region</dt>
                    <dd className="mt-0.5 break-words">{company.region || "—"}</dd>
                  </div>
                  <div>
                    <dt className="text-xs text-slate-500">Aliases</dt>
                    <dd className="mt-0.5 break-words">{company.aliases.join(", ") || "—"}</dd>
                  </div>
                  {Object.entries(company.public_identifiers).map(([key, value]) => (
                    <div key={key}>
                      <dt className="text-xs capitalize text-slate-500">
                        {key.replace(/_/g, " ")}
                      </dt>
                      <dd className="mt-0.5 break-words">{value}</dd>
                    </div>
                  ))}
                </dl>
              </section>
              <section className="rounded-lg border border-slate-200 bg-white p-5 text-sm">
                <h2 className="font-medium text-slate-700">Schedule</h2>
                <dl className="mt-3 space-y-2">
                  <div className="flex justify-between">
                    <dt className="text-slate-500">Frequency</dt>
                    <dd>{config ? FREQUENCY_LABELS[config.frequency_type] : "—"}</dd>
                  </div>
                  <div className="flex justify-between">
                    <dt className="text-slate-500">Next run</dt>
                    <dd>{formatDateTime(config?.next_run)}</dd>
                  </div>
                  <div className="flex justify-between">
                    <dt className="text-slate-500">Last run</dt>
                    <dd>{formatDateTime(config?.last_run)}</dd>
                  </div>
                </dl>
              </section>
            </aside>
          </div>
        )}

        {tab === "Enrichment" && (
          <div className="space-y-4">
            {!company.enrichment ? (
              <div className="rounded-lg border border-dashed border-slate-300 bg-white p-10 text-center text-sm text-slate-500">
                Company enrichment (NinjaPear) isn&apos;t configured for this app — no data
                provider key is set.
              </div>
            ) : company.enrichment.status === "pending" ? (
              <div className="rounded-lg border border-slate-200 bg-white p-10 text-center text-sm text-slate-500">
                Enriching this company from external data sources… this can take a few minutes.
              </div>
            ) : (
              <>
                {company.enrichment.status === "partial" && (
                  <EnrichmentErrorSummary
                    tone="amber"
                    summary={`Some enrichment sections couldn't be fetched: ${Object.keys(
                      company.enrichment.errors,
                    ).join(", ")}.`}
                    errors={company.enrichment.errors}
                  />
                )}
                {company.enrichment.status === "failed" && (
                  <EnrichmentErrorSummary
                    tone="red"
                    summary="Enrichment failed for every section — no external data is available for this company."
                    errors={company.enrichment.errors}
                  />
                )}

                <div className="grid gap-4 sm:grid-cols-2">
                  <section className="rounded-lg border border-slate-200 bg-white p-5 text-sm">
                    <h2 className="font-medium text-slate-700">Company snapshot</h2>
                    <dl className="mt-3 space-y-2">
                      <div className="flex justify-between">
                        <dt className="text-slate-500">Employees</dt>
                        <dd>{String(company.enrichment.data.employee_count ?? "—")}</dd>
                      </div>
                      <div className="flex justify-between">
                        <dt className="text-slate-500">Founded</dt>
                        <dd>{String(company.enrichment.data.founded_year ?? "—")}</dd>
                      </div>
                    </dl>
                    {Array.isArray(company.enrichment.data.specialties) &&
                      (company.enrichment.data.specialties as string[]).length > 0 && (
                        <>
                          <h3 className="mt-4 text-xs font-medium uppercase text-slate-500">
                            Specialties
                          </h3>
                          <ul className="mt-1 flex flex-wrap gap-1.5">
                            {(company.enrichment.data.specialties as string[]).map((s) => (
                              <li
                                key={s}
                                className="rounded-full bg-slate-100 px-2.5 py-0.5 text-xs text-slate-700"
                              >
                                {s}
                              </li>
                            ))}
                          </ul>
                        </>
                      )}
                  </section>

                  <section className="rounded-lg border border-slate-200 bg-white p-5 text-sm">
                    <h2 className="font-medium text-slate-700">Funding</h2>
                    {(() => {
                      const funding = company.enrichment.data.funding as
                        | { total_raised?: string; rounds?: Record<string, unknown>[] }
                        | undefined;
                      if (!funding || (!funding.total_raised && !funding.rounds?.length)) {
                        return (
                          <div className="animate-fade-in">
                            <p className="mt-2 text-slate-500">No funding data found.</p>
                            <RefreshSectionButton
                              section="funding"
                              label="funding data"
                              mutation={refreshEnrichmentSection}
                            />
                          </div>
                        );
                      }
                      return (
                        <>
                          {funding.total_raised && (
                            <p className="mt-2 text-slate-600">
                              Total raised:{" "}
                              <span className="font-medium">
                                {formatMoney(funding.total_raised)}
                              </span>
                            </p>
                          )}
                          <ul className="mt-2 space-y-2">
                            {(funding.rounds ?? []).map((r, i) => (
                              <li
                                key={i}
                                className="border-t border-slate-100 pt-2 first:border-0 first:pt-0"
                              >
                                <p className="text-slate-700">
                                  {String(r.round_name ?? "Round")} —{" "}
                                  {r.amount ? formatMoney(String(r.amount)) : "—"}
                                  {r.date ? ` (${String(r.date)})` : ""}
                                </p>
                                {Array.isArray(r.investors) &&
                                  (r.investors as string[]).length > 0 && (
                                    <p className="text-xs text-slate-500">
                                      Investors: {(r.investors as string[]).join(", ")}
                                    </p>
                                  )}
                              </li>
                            ))}
                          </ul>
                        </>
                      );
                    })()}
                  </section>
                </div>

                <section className="rounded-lg border border-slate-200 bg-white p-5 text-sm">
                  <h2 className="font-medium text-slate-700">Leadership team</h2>
                  {!Array.isArray(company.enrichment.data.leadership_team) ||
                  (company.enrichment.data.leadership_team as unknown[]).length === 0 ? (
                    <div className="animate-fade-in">
                      <p className="mt-2 text-slate-500">No leadership team data found.</p>
                      <RefreshSectionButton
                        section="details"
                        label="leadership team"
                        mutation={refreshEnrichmentSection}
                      />
                    </div>
                  ) : (
                    <ul className="mt-2">
                      {(
                        company.enrichment.data.leadership_team as Record<string, unknown>[]
                      ).map((m, i) => (
                        <li key={i}>
                          {i > 0 && <hr className="my-2 border-t border-slate-100 mx-3" />}
                          <div className="flex items-center justify-between gap-4 py-1">
                            <div>
                              <p className="text-slate-800">{String(m.name ?? "")}</p>
                              {m.title ? (
                                <p className="text-xs text-slate-500">{String(m.title)}</p>
                              ) : null}
                            </div>
                            <div className="flex shrink-0 items-center gap-2 text-xs">
                              {m.work_email ? <CopyableEmail email={String(m.work_email)} /> : null}
                              {m.work_email && m.profile_url ? (
                                <span className="text-slate-300">-</span>
                              ) : null}
                              {m.profile_url ? (
                                <a
                                  href={String(m.profile_url)}
                                  target="_blank"
                                  rel="noopener noreferrer"
                                  className="text-blue-600 hover:underline"
                                >
                                  Profile
                                </a>
                              ) : null}
                            </div>
                          </div>
                        </li>
                      ))}
                    </ul>
                  )}
                </section>

                <div className="grid gap-4 sm:grid-cols-2">
                  <section className="rounded-lg border border-slate-200 bg-white p-5 text-sm">
                    <h2 className="font-medium text-slate-700">Products</h2>
                    {!Array.isArray(company.enrichment.data.products) ||
                    (company.enrichment.data.products as unknown[]).length === 0 ? (
                      <div className="animate-fade-in">
                        <p className="mt-2 text-slate-500">None found.</p>
                        <RefreshSectionButton
                          section="products"
                          label="products"
                          mutation={refreshEnrichmentSection}
                        />
                      </div>
                    ) : (
                      <ul className="mt-2 space-y-1.5">
                        {(company.enrichment.data.products as Record<string, unknown>[]).map(
                          (p, i) => (
                            <li key={i}>
                              <span className="text-slate-800">{String(p.name ?? "")}</span>
                              {p.description ? (
                                <span className="text-xs text-slate-500">
                                  {" "}
                                  — {String(p.description)}
                                </span>
                              ) : null}
                            </li>
                          ),
                        )}
                      </ul>
                    )}
                  </section>

                  <section className="rounded-lg border border-slate-200 bg-white p-5 text-sm">
                    <h2 className="font-medium text-slate-700">Recent updates</h2>
                    {!Array.isArray(company.enrichment.data.recent_updates) ||
                    (company.enrichment.data.recent_updates as unknown[]).length === 0 ? (
                      <div className="animate-fade-in">
                        <p className="mt-2 text-slate-500">None found.</p>
                        <RefreshSectionButton
                          section="updates"
                          label="recent updates"
                          mutation={refreshEnrichmentSection}
                        />
                      </div>
                    ) : (
                      <ul className="mt-2">
                        {(
                          company.enrichment.data.recent_updates as Record<string, unknown>[]
                        ).map((u, i) => (
                          <li key={i}>
                            {i > 0 && <hr className="my-2 border-t border-slate-100 mx-3" />}
                            <p className="text-slate-700">{String(u.text ?? "")}</p>
                            {u.url ? (
                              <a
                                href={String(u.url)}
                                target="_blank"
                                rel="noreferrer"
                                className="text-xs text-brand-600 hover:underline"
                              >
                                {String(u.url)}
                              </a>
                            ) : null}
                          </li>
                        ))}
                      </ul>
                    )}
                  </section>
                </div>

                <div className="grid gap-4 sm:grid-cols-2">
                  <section className="rounded-lg border border-slate-200 bg-white p-5 text-sm">
                    <h2 className="font-medium text-slate-700">Customers</h2>
                    {!Array.isArray(company.enrichment.data.customers) ||
                    (company.enrichment.data.customers as unknown[]).length === 0 ? (
                      <div className="animate-fade-in">
                        <p className="mt-2 text-slate-500">None found.</p>
                        <RefreshSectionButton
                          section="customers"
                          label="customers"
                          mutation={refreshEnrichmentSection}
                        />
                      </div>
                    ) : (
                      <ul className="mt-2 flex flex-wrap gap-2">
                        {(company.enrichment.data.customers as Record<string, unknown>[]).map(
                          (c, i) => {
                            const name = String(c.name ?? "");
                            if (!name) return null;
                            return (
                              <li key={i}>
                                <CompanyPillLink
                                  name={name}
                                  monitoredByName={monitoredByName}
                                  returnTo={returnTo}
                                />
                              </li>
                            );
                          },
                        )}
                      </ul>
                    )}
                  </section>

                  <section className="rounded-lg border border-slate-200 bg-white p-5 text-sm">
                    <h2 className="font-medium text-slate-700">
                      Competitors{" "}
                      <span className="text-xs font-normal text-slate-400">(API-suggested)</span>
                    </h2>
                    {!Array.isArray(company.enrichment.data.competitors) ||
                    (company.enrichment.data.competitors as unknown[]).length === 0 ? (
                      <div className="animate-fade-in">
                        <p className="mt-2 text-slate-500">None found.</p>
                        <RefreshSectionButton
                          section="competitors"
                          label="competitors"
                          mutation={refreshEnrichmentSection}
                        />
                      </div>
                    ) : (
                      <ul className="mt-2 flex flex-wrap gap-2">
                        {(
                          company.enrichment.data.competitors as Record<string, unknown>[]
                        ).map((c, i) => {
                          const name = companyNameFromUrl(String(c.name ?? ""));
                          if (!name) return null;
                          return (
                            <li key={i}>
                              <CompanyPillLink
                                name={name}
                                subtitle={c.reason ? formatEnrichmentReason(String(c.reason)) : undefined}
                                monitoredByName={monitoredByName}
                                returnTo={returnTo}
                              />
                            </li>
                          );
                        })}
                      </ul>
                    )}
                  </section>
                </div>

                {company.enrichment.credits_spent !== null && (
                  <p className="text-xs text-slate-400">
                    {company.enrichment.credits_spent} NinjaPear Credits spent fetching this data
                    {company.enrichment.fetched_at
                      ? ` on ${formatDateTime(company.enrichment.fetched_at)}`
                      : ""}
                    .
                  </p>
                )}
              </>
            )}
          </div>
        )}

        {tab === "Alerts" && (
          <div>
            {alertsLoading ? (
              <p className="text-sm text-slate-500">Loading…</p>
            ) : !alerts || alerts.length === 0 ? (
              <div className="rounded-lg border border-dashed border-slate-300 bg-white p-10 text-center">
                <AlertTriangle className="mx-auto h-8 w-8 text-slate-400" aria-hidden />
                <p className="mt-3 text-sm text-slate-600">No alerts for this company yet.</p>
              </div>
            ) : (
              <ul className="divide-y divide-slate-100 rounded-lg border border-slate-200 bg-white">
                {alerts.map((alert) => (
                  <li key={alert.id} className="flex items-start justify-between gap-4 px-4 py-4">
                    <div className="min-w-0 flex-1">
                      <div className="flex items-center gap-2">
                        <SeverityBadge severity={alert.severity} />
                        {!alert.read && (
                          <span
                            className="h-1.5 w-1.5 rounded-full bg-brand-600"
                            aria-label="Unread"
                          />
                        )}
                        {alert.resolved && (
                          <span className="text-xs font-medium text-slate-400">Resolved</span>
                        )}
                      </div>
                      <Link
                        href={`/alerts/${alert.id}`}
                        className="mt-1 block truncate font-medium text-slate-900 hover:text-brand-600"
                      >
                        {alert.title}
                      </Link>
                      <p className="mt-0.5 text-sm text-slate-600">
                        {formatRelative(alert.created_at)} · {Math.round(alert.confidence * 100)}%
                        confidence
                      </p>
                    </div>
                    <div className="flex shrink-0 items-center gap-1">
                      {!alert.read && (
                        <button
                          title="Mark read"
                          onClick={() => markAlertRead.mutate(alert.id)}
                          className="focus-ring rounded-md p-2 text-slate-500 transition-colors duration-150 hover:bg-slate-100"
                        >
                          <Check className="h-4 w-4" aria-hidden />
                          <span className="sr-only">Mark read</span>
                        </button>
                      )}
                      {!alert.resolved && (
                        <button
                          title="Resolve"
                          onClick={() => resolveAlert.mutate(alert.id)}
                          className="focus-ring rounded-md p-2 text-slate-500 transition-colors duration-150 hover:bg-slate-100"
                        >
                          <CheckCheck className="h-4 w-4" aria-hidden />
                          <span className="sr-only">Resolve</span>
                        </button>
                      )}
                    </div>
                  </li>
                ))}
              </ul>
            )}
          </div>
        )}

        {tab === "Configuration" && config && (
          <div className="max-w-xl rounded-lg border border-slate-200 bg-white p-5">
            <h2 className="text-sm font-medium text-slate-700">Monitoring configuration</h2>
            <form
              className="mt-4 space-y-4"
              onSubmit={(e) => {
                e.preventDefault();
                const form = new FormData(e.currentTarget);
                updateMonitor.mutate({
                  frequency_type: form.get("frequency_type") as never,
                  severity_threshold: form.get("severity_threshold") as never,
                  timezone: String(form.get("timezone")),
                });
              }}
            >
              <div>
                <label className="block text-sm font-medium text-slate-700">Frequency</label>
                <div className="mt-1">
                  <Select
                    name="frequency_type"
                    value={frequencyOverride ?? config.frequency_type}
                    onValueChange={setFrequencyOverride}
                    options={MONITORING_FREQUENCIES.map((f) => ({
                      value: f,
                      label: FREQUENCY_LABELS[f],
                    }))}
                    triggerClassName="w-full px-3 py-2 text-sm"
                  />
                </div>
              </div>
              <div>
                <label className="block text-sm font-medium text-slate-700">
                  Severity threshold
                </label>
                <div className="mt-1">
                  <Select
                    name="severity_threshold"
                    value={severityOverride ?? config.severity_threshold}
                    onValueChange={setSeverityOverride}
                    options={SEVERITY_LEVELS.map((s) => ({ value: s, label: SEVERITY_LABELS[s] }))}
                    triggerClassName="w-full px-3 py-2 text-sm"
                  />
                </div>
              </div>
              <div>
                <label className="block text-sm font-medium text-slate-700">Timezone</label>
                <input
                  name="timezone"
                  defaultValue={config.timezone}
                  className="focus-ring mt-1 block w-full rounded-md border border-slate-300 px-3 py-2 text-sm shadow-sm"
                />
              </div>
              <button
                type="submit"
                disabled={updateMonitor.isPending}
                className="focus-ring rounded-md bg-brand-600 px-4 py-2 text-sm font-semibold text-white hover:bg-brand-700 disabled:opacity-60"
              >
                {updateMonitor.isPending ? "Saving…" : "Save changes"}
              </button>
              {updateMonitor.isSuccess && (
                <p className="text-sm text-green-700">Configuration updated.</p>
              )}
            </form>
          </div>
        )}

        {tab === "Configuration" && config && (
          <div className="mt-4 max-w-xl rounded-lg border border-slate-200 bg-white p-5">
            <h2 className="text-sm font-medium text-slate-700">Notifications</h2>
            <p className="mt-1 text-xs text-slate-500">
              Where alerts for this company get sent. Managing them here also updates the
              Settings page, and vice versa.
            </p>
            <div className="mt-4 space-y-4">
              <NotificationChannelBox
                type="email"
                label="Email"
                placeholder="you@example.com"
                companyId={company.id}
                destination={emailDestination}
              />
              <NotificationChannelBox
                type="sms"
                label="Phone"
                placeholder="+15551234567"
                companyId={company.id}
                destination={smsDestination}
                disabled={!systemStatus?.sms_enabled}
                disabledReason="SMS delivery isn't enabled for this app yet."
              />
            </div>
          </div>
        )}

        {tab === "Latest report" && (
          <div className="space-y-4">
            <div className="flex items-center justify-between">
              <p className="text-xs text-slate-500">
                {reports && reports.length > 0
                  ? `${reports.length} report(s) generated for this company.`
                  : "No reports yet."}
              </p>
              <button
                onClick={() => generateReport.mutate()}
                disabled={generateReport.isPending}
                className="focus-ring rounded-md border border-slate-300 px-3 py-1.5 text-xs font-medium text-slate-700 hover:bg-slate-50 disabled:opacity-60"
              >
                {generateReport.isPending ? "Generating…" : "Generate report now"}
              </button>
            </div>

            {!runsLoading && (!runs || runs.length === 0) && (
              <p className="rounded-md bg-amber-50 p-3 text-xs text-amber-800">
                No monitoring run has collected any evidence yet, so a report generated now will
                come back mostly empty by design — this app never fabricates findings without real
                evidence. Click &quot;Run now&quot; above first, then generate the report.
              </p>
            )}

            {reportsLoading ? (
              <p className="text-sm text-slate-500">Loading…</p>
            ) : !reports || reports.length === 0 || !reports[0] ? (
              <div className="rounded-lg border border-dashed border-slate-300 bg-white p-10 text-center text-sm text-slate-500">
                No reports yet. Run a collection or click &quot;Generate report now&quot;.
              </div>
            ) : (
              <div className="rounded-lg border border-slate-200 bg-white">
                <div className="border-b border-slate-200 p-4">
                  <Link
                    href={`/reports/${reports[0].id}`}
                    className="text-sm font-medium text-brand-600 hover:text-brand-700"
                  >
                    View latest report ({reports[0].report_type},{" "}
                    {formatDateTime(reports[0].created_at)}) →
                  </Link>
                  <p className="mt-1 text-sm text-slate-600">{reports[0].executive_summary}</p>
                </div>
                {reports.length > 1 && (
                  <ul className="divide-y divide-slate-100">
                    {reports.slice(1).map((r) => (
                      <li key={r.id} className="p-3 text-sm">
                        <Link
                          href={`/reports/${r.id}`}
                          className="text-brand-600 hover:text-brand-700"
                        >
                          {r.title} — {r.report_type}
                        </Link>
                        <span className="ml-2 text-xs text-slate-400">
                          {formatDateTime(r.created_at)}
                        </span>
                      </li>
                    ))}
                  </ul>
                )}
              </div>
            )}
          </div>
        )}

        {tab === "Sources" && (
          <div className="space-y-4">
            <div className="rounded-lg border border-slate-200 bg-white p-5">
              <h2 className="text-sm font-medium text-slate-700">Add a custom URL source</h2>
              <p className="mt-1 text-xs text-slate-500">
                Website, GitHub, SEC EDGAR, and careers-page sources are found automatically the
                first time this company runs. Add any other public URL or RSS feed here to
                monitor it too.
              </p>
              <form
                className="mt-3 flex flex-wrap items-end gap-3"
                onSubmit={(e) => {
                  e.preventDefault();
                  if (!newSourceName || !newSourceUrl) return;
                  createSource.mutate(
                    { source_type: "custom_url", name: newSourceName, base_url: newSourceUrl },
                    {
                      onSuccess: () => {
                        setNewSourceName("");
                        setNewSourceUrl("");
                      },
                    },
                  );
                }}
              >
                <div>
                  <label className="block text-xs font-medium text-slate-600">Name</label>
                  <input
                    value={newSourceName}
                    onChange={(e) => setNewSourceName(e.target.value)}
                    className="focus-ring mt-1 rounded-md border border-slate-300 px-3 py-2 text-sm"
                    placeholder="Pricing page"
                  />
                </div>
                <div className="min-w-[200px] flex-1">
                  <label className="block text-xs font-medium text-slate-600">URL</label>
                  <input
                    value={newSourceUrl}
                    onChange={(e) => setNewSourceUrl(e.target.value)}
                    className="focus-ring mt-1 block w-full rounded-md border border-slate-300 px-3 py-2 text-sm"
                    placeholder="example.com/pricing"
                  />
                </div>
                <button
                  type="submit"
                  disabled={createSource.isPending}
                  className="focus-ring inline-flex items-center gap-1 rounded-md bg-brand-600 px-3 py-2 text-sm font-semibold text-white hover:bg-brand-700 disabled:opacity-60"
                >
                  <Plus className="h-4 w-4" aria-hidden /> Add
                </button>
              </form>
            </div>

            <div className="rounded-lg border border-slate-200 bg-white">
              {sourcesLoading ? (
                <p className="p-5 text-sm text-slate-500">Loading…</p>
              ) : !sources || sources.length === 0 ? (
                <p className="p-5 text-sm text-slate-500">
                  {runs && runs.length > 0
                    ? "No sources configured yet."
                    : "Website, GitHub, and other sources are discovered automatically on the " +
                      'first monitoring run — click "Run now" above to get started, or add a ' +
                      "custom URL yourself above."}
                </p>
              ) : (
                <table className="w-full text-left text-sm">
                  <thead className="border-b border-slate-200 bg-slate-50 text-xs uppercase tracking-wide text-slate-500">
                    <tr>
                      <th className="px-4 py-2">Name</th>
                      <th className="px-4 py-2">Type</th>
                      <th className="px-4 py-2">Status</th>
                      <th className="px-4 py-2">Last checked</th>
                      <th className="px-4 py-2">Check frequency</th>
                      <th className="px-4 py-2 text-right">Actions</th>
                    </tr>
                  </thead>
                  <tbody className="divide-y divide-slate-100">
                    {sources.map((source) => {
                      const isTesting =
                        testSource.isPending && testSource.variables === source.id;
                      const isDeleting =
                        deleteSource.isPending && deleteSource.variables === source.id;
                      return (
                        <tr key={source.id}>
                          <td className="px-4 py-2">
                            {source.name}
                            {source.base_url && (
                              <div className="text-xs text-slate-500">{source.base_url}</div>
                            )}
                          </td>
                          <td className="px-4 py-2 text-slate-600">{source.source_type}</td>
                          <td className="px-4 py-2 text-slate-600">{source.status}</td>
                          <td className="px-4 py-2 text-slate-600">
                            {formatDateTime(source.last_checked)}
                          </td>
                          <td className="px-4 py-2">
                            <Select
                              ariaLabel={`Check frequency for ${source.name}`}
                              value={source.frequency_type ?? ""}
                              onValueChange={(value) =>
                                updateSource.mutate({
                                  sourceId: source.id,
                                  payload: {
                                    frequency_type:
                                      value === "" ? null : (value as MonitoringFrequency),
                                  },
                                })
                              }
                              options={[
                                { value: "", label: "Same as company" },
                                ...MONITORING_FREQUENCIES.filter((f) => f !== "custom").map(
                                  (f) => ({ value: f, label: FREQUENCY_LABELS[f] }),
                                ),
                              ]}
                              triggerClassName="w-full min-w-[140px] px-2 py-1.5 text-xs"
                            />
                          </td>
                          <td className="px-4 py-2">
                            <div className="flex items-center justify-end gap-2">
                              <button
                                onClick={() =>
                                  testSource.mutate(source.id, {
                                    onSuccess: (result) =>
                                      setTestResults((prev) => ({
                                        ...prev,
                                        [source.id]: `${result.status} — ${result.documents_found} document(s)${result.error ? `: ${result.error}` : ""}`,
                                      })),
                                  })
                                }
                                disabled={isTesting}
                                title="Runs a real collection check on this source right now, outside its normal schedule"
                                className="focus-ring inline-flex items-center gap-1 rounded-md border border-slate-300 px-2 py-1 text-xs font-medium text-slate-700 transition-colors duration-150 hover:bg-slate-50 disabled:opacity-60"
                              >
                                {isTesting && (
                                  <Loader2 className="h-3 w-3 animate-spin" aria-hidden />
                                )}
                                Test
                              </button>
                              <button
                                onClick={() => deleteSource.mutate(source.id)}
                                disabled={isDeleting}
                                className="focus-ring inline-flex items-center gap-1 rounded-md px-2 py-1 text-xs font-medium text-red-600 transition-colors duration-150 hover:bg-red-50 disabled:opacity-60"
                              >
                                {isDeleting && (
                                  <Loader2 className="h-3 w-3 animate-spin" aria-hidden />
                                )}
                                Delete
                              </button>
                            </div>
                            {testResults[source.id] && (
                              <p className="mt-1 text-right text-xs text-slate-500">
                                {testResults[source.id]}
                              </p>
                            )}
                          </td>
                        </tr>
                      );
                    })}
                  </tbody>
                </table>
              )}
            </div>
          </div>
        )}

        {tab === "Monitoring history" && (
          <div className="rounded-lg border border-slate-200 bg-white">
            {runsLoading ? (
              <p className="p-5 text-sm text-slate-500">Loading…</p>
            ) : !runs || runs.length === 0 ? (
              <p className="p-5 text-sm text-slate-500">
                No monitoring runs yet. Click &quot;Run now&quot; above to start one.
              </p>
            ) : (
              <table className="w-full text-left text-sm">
                <thead className="border-b border-slate-200 bg-slate-50 text-xs uppercase tracking-wide text-slate-500">
                  <tr>
                    <th className="px-4 py-2">Started</th>
                    <th className="px-4 py-2">Trigger</th>
                    <th className="px-4 py-2">Status</th>
                    <th className="px-4 py-2">Sources</th>
                    <th className="px-4 py-2">Items collected</th>
                    <th className="px-4 py-2">Notes</th>
                  </tr>
                </thead>
                <tbody className="divide-y divide-slate-100">
                  {runs.map((run) => (
                    <tr key={run.id}>
                      <td className="px-4 py-2 text-slate-600">
                        {formatDateTime(run.started_at ?? run.created_at)}
                      </td>
                      <td className="px-4 py-2 capitalize text-slate-600">{run.trigger_type}</td>
                      <td className="px-4 py-2">
                        <span
                          className={`inline-flex items-center rounded-full px-2 py-0.5 text-xs font-medium capitalize ${
                            RUN_STATUS_CLASSES[run.status] ?? "bg-slate-100 text-slate-700"
                          }`}
                        >
                          {run.status}
                        </span>
                      </td>
                      <td className="px-4 py-2 text-slate-600">
                        {run.sources_successful}/{run.sources_attempted} succeeded
                      </td>
                      <td className="px-4 py-2 text-slate-600">{run.items_collected}</td>
                      <td className="px-4 py-2 text-xs text-slate-500">
                        {run.error_summary ?? "—"}
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            )}
          </div>
        )}

        {tab === "Snapshots" && (
          <div className="rounded-lg border border-slate-200 bg-white">
            {snapshotsLoading ? (
              <p className="p-5 text-sm text-slate-500">Loading…</p>
            ) : !snapshots || snapshots.length === 0 ? (
              <p className="p-5 text-sm text-slate-500">
                {runs && runs.length > 0
                  ? "No snapshots recorded yet."
                  : 'No snapshots yet — snapshots are captured during monitoring runs. Click "Run now" above to get started.'}
              </p>
            ) : (
              <ul className="divide-y divide-slate-100">
                {snapshots.map((snapshot) => {
                  const isExpanded = expandedSnapshots.has(snapshot.id);
                  const sourceName =
                    sources?.find((s) => s.id === snapshot.source_id)?.name ?? "Unknown source";
                  return (
                    <li key={snapshot.id}>
                      <button
                        onClick={() =>
                          setExpandedSnapshots((prev) => {
                            const next = new Set(prev);
                            if (next.has(snapshot.id)) next.delete(snapshot.id);
                            else next.add(snapshot.id);
                            return next;
                          })
                        }
                        className="focus-ring flex w-full items-center justify-between gap-4 px-4 py-3 text-left hover:bg-slate-50"
                      >
                        <span className="flex min-w-0 items-center gap-2 text-sm">
                          {isExpanded ? (
                            <ChevronDown className="h-4 w-4 shrink-0 text-slate-400" aria-hidden />
                          ) : (
                            <ChevronRight className="h-4 w-4 shrink-0 text-slate-400" aria-hidden />
                          )}
                          <span className="truncate font-medium text-slate-700">{sourceName}</span>
                          <span className="shrink-0 rounded-full bg-slate-100 px-2 py-0.5 text-xs capitalize text-slate-600">
                            {snapshot.snapshot_type}
                          </span>
                        </span>
                        <span className="shrink-0 text-xs text-slate-500">
                          {formatDateTime(snapshot.created_at)} · {charCount(snapshot.text_summary)}
                        </span>
                      </button>
                      {isExpanded && (
                        <div className="animate-fade-in space-y-3 border-t border-slate-100 bg-slate-50 px-4 py-3">
                          <div>
                            <p className="text-xs font-medium uppercase tracking-wide text-slate-500">
                              Hash
                            </p>
                            <p className="mt-1 break-all font-mono text-xs text-slate-600">
                              {snapshot.hash}
                            </p>
                          </div>
                          {snapshot.text_summary && (
                            <div>
                              <p className="text-xs font-medium uppercase tracking-wide text-slate-500">
                                Text summary
                              </p>
                              <p className="mt-1 max-h-64 overflow-y-auto whitespace-pre-wrap rounded-md bg-white p-3 text-xs text-slate-700">
                                {snapshot.text_summary}
                              </p>
                            </div>
                          )}
                          {Object.keys(snapshot.structured_summary).length > 0 && (
                            <div>
                              <p className="text-xs font-medium uppercase tracking-wide text-slate-500">
                                Structured summary
                              </p>
                              <pre className="mt-1 max-h-64 overflow-auto rounded-md bg-white p-3 text-xs text-slate-700">
                                {JSON.stringify(snapshot.structured_summary, null, 2)}
                              </pre>
                            </div>
                          )}
                        </div>
                      )}
                    </li>
                  );
                })}
              </ul>
            )}
          </div>
        )}
      </div>
    </div>
  );
}