"use client";

import { useState } from "react";
import type { ConfidenceLabel, Finding, InferredProject, ReportResponse } from "@/lib/types";
import { formatDateTime } from "@/lib/format";

const CONFIDENCE_LABELS: Record<ConfidenceLabel, string> = {
  confirmed: "Confirmed",
  strongly_indicated: "Strongly indicated",
  likely: "Likely",
  possible: "Possible",
  unconfirmed: "Unconfirmed",
  insufficient_evidence: "Insufficient evidence",
};

const CONFIDENCE_CLASSES: Record<ConfidenceLabel, string> = {
  confirmed: "bg-green-100 text-green-800",
  strongly_indicated: "bg-green-50 text-green-700",
  likely: "bg-amber-100 text-amber-800",
  possible: "bg-amber-50 text-amber-700",
  unconfirmed: "bg-slate-100 text-slate-600",
  insufficient_evidence: "bg-slate-100 text-slate-500",
};

function ConfidenceBadge({ confidence }: { confidence: ConfidenceLabel }) {
  return (
    <span
      className={`inline-flex items-center rounded-full px-2 py-0.5 text-xs font-medium ${CONFIDENCE_CLASSES[confidence]}`}
    >
      {CONFIDENCE_LABELS[confidence]}
    </span>
  );
}

function Section({
  number,
  title,
  children,
}: {
  number: number;
  title: string;
  children: React.ReactNode;
}) {
  return (
    <section className="border-b border-slate-200 py-6 first:pt-0 last:border-0">
      <h2 className="text-sm font-semibold uppercase tracking-wide text-slate-500">
        {number}. {title}
      </h2>
      <div className="mt-3 text-sm text-slate-700">{children}</div>
    </section>
  );
}

function FindingList({ findings }: { findings: Finding[] }) {
  if (findings.length === 0) {
    return (
      <p className="text-sm text-slate-500">
        No findings for this section from the current evidence.
      </p>
    );
  }
  return (
    <ul className="space-y-3">
      {findings.map((f, i) => (
        <li key={i} className="rounded-md border border-slate-200 p-3">
          <div className="flex items-start justify-between gap-2">
            <p className="font-medium text-slate-900">{f.headline}</p>
            <ConfidenceBadge confidence={f.confidence} />
          </div>
          <p className="mt-1 text-slate-600">{f.summary}</p>
          {f.date && <p className="mt-1 text-xs text-slate-400">{f.date}</p>}
        </li>
      ))}
    </ul>
  );
}

function ProjectList({ projects }: { projects: InferredProject[] }) {
  if (projects.length === 0) {
    return (
      <p className="text-sm text-slate-500">
        No inferred strategic projects from the current evidence.
      </p>
    );
  }
  return (
    <ul className="space-y-3">
      {projects.map((p, i) => (
        <li key={i} className="rounded-md border border-slate-200 p-3">
          <div className="flex items-start justify-between gap-2">
            <p className="font-medium text-slate-900">{p.project_name}</p>
            <ConfidenceBadge confidence={p.status} />
          </div>
          <p className="mt-1 text-slate-600">{p.summary}</p>
          {p.alternative_explanations.length > 0 && (
            <p className="mt-1 text-xs text-slate-500">
              Alternative explanations: {p.alternative_explanations.join("; ")}
            </p>
          )}
        </li>
      ))}
    </ul>
  );
}

function StringList({ items, emptyText }: { items: string[]; emptyText: string }) {
  if (items.length === 0) return <p className="text-sm text-slate-500">{emptyText}</p>;
  return (
    <ul className="list-inside list-disc space-y-1">
      {items.map((item, i) => (
        <li key={i}>{item}</li>
      ))}
    </ul>
  );
}

export function ReportView({ report }: { report: ReportResponse }) {
  const [copied, setCopied] = useState(false);
  const c = report.structured_report;

  const handleCopy = async () => {
    await navigator.clipboard.writeText(JSON.stringify(c, null, 2));
    setCopied(true);
    setTimeout(() => setCopied(false), 2000);
  };

  const downloadJson = () => {
    const blob = new Blob([JSON.stringify(c, null, 2)], { type: "application/json" });
    const url = URL.createObjectURL(blob);
    const a = document.createElement("a");
    a.href = url;
    a.download = `${report.title}.json`;
    a.click();
    URL.revokeObjectURL(url);
  };

  return (
    <div>
      <div className="flex flex-wrap items-center justify-between gap-3 print:hidden">
        <div>
          <h1 className="text-xl font-semibold text-slate-900">{report.title}</h1>
          <p className="text-xs text-slate-500">
            {report.report_type} report · generated {formatDateTime(report.created_at)} ·{" "}
            {report.model_provider}/{report.model_name}
          </p>
        </div>
        <div className="flex gap-2">
          <button
            onClick={handleCopy}
            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"
          >
            {copied ? "Copied!" : "Copy JSON"}
          </button>
          <button
            onClick={() => window.print()}
            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"
          >
            Print
          </button>
          <button
            onClick={downloadJson}
            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"
          >
            Export JSON
          </button>
        </div>
      </div>

      <div className="mt-6 rounded-lg border border-slate-200 bg-white p-6">
        <Section number={1} title="Executive Summary">
          <p>{c.executive_summary}</p>
        </Section>
        <Section number={2} title="Company Overview">
          <p>{c.company_overview}</p>
        </Section>
        <Section number={3} title="Products and Service Landscape">
          <FindingList findings={c.products_and_services} />
        </Section>
        <Section number={4} title="Recent Developments">
          <FindingList findings={c.recent_developments} />
        </Section>
        <Section number={5} title="Strategic Initiatives">
          <FindingList findings={c.strategic_initiatives} />
        </Section>
        <Section number={6} title="Key Project Signals">
          <ProjectList projects={c.key_inferred_projects} />
        </Section>
        <Section number={7} title="Competitive Positioning">
          <p>{c.market_positioning}</p>
          <p className="mt-2">{c.competitor_comparison}</p>
        </Section>
        <Section number={8} title="SWOT Analysis">
          <div className="grid gap-4 sm:grid-cols-2">
            <div>
              <h3 className="text-xs font-semibold text-slate-500">Strengths</h3>
              <StringList items={c.swot.strengths} emptyText="None noted." />
            </div>
            <div>
              <h3 className="text-xs font-semibold text-slate-500">Weaknesses</h3>
              <StringList items={c.swot.weaknesses} emptyText="None noted." />
            </div>
            <div>
              <h3 className="text-xs font-semibold text-slate-500">Opportunities</h3>
              <StringList items={c.swot.opportunities} emptyText="None noted." />
            </div>
            <div>
              <h3 className="text-xs font-semibold text-slate-500">Threats</h3>
              <StringList items={c.swot.threats} emptyText="None noted." />
            </div>
          </div>
        </Section>
        <Section number={9} title="Hiring Signals">
          <FindingList findings={c.hiring_signals} />
        </Section>
        <Section number={10} title="Product and Technology Signals">
          <FindingList findings={[...c.technology_signals, ...c.patent_signals]} />
        </Section>
        <Section number={11} title="Customer Sentiment">
          <p>{c.customer_sentiment}</p>
        </Section>
        <Section number={12} title="Financial and Regulatory Signals">
          <FindingList findings={[...c.financial_signals, ...c.regulatory_and_legal_signals]} />
        </Section>
        <Section number={13} title="Risks and Opportunities">
          <div className="grid gap-4 sm:grid-cols-2">
            <div>
              <h3 className="text-xs font-semibold text-slate-500">Risks</h3>
              <StringList items={c.risks} emptyText="None noted." />
            </div>
            <div>
              <h3 className="text-xs font-semibold text-slate-500">Opportunities</h3>
              <StringList items={c.opportunities} emptyText="None noted." />
            </div>
          </div>
        </Section>
        <Section number={14} title="Important Unknowns">
          <StringList items={c.unknowns_and_missing_data} emptyText="None noted." />
        </Section>
        <Section number={15} title="Monitoring Recommendations">
          <StringList items={c.monitoring_recommendations} emptyText="None noted." />
        </Section>
        <Section number={16} title="Methodology and Limitations">
          <p>{c.methodology}</p>
          <p className="mt-2 text-slate-500">{c.limitations}</p>
        </Section>
      </div>
    </div>
  );
}