"use client";

import Link from "next/link";
import { Building2, LineChart, Mail, Radar, ShieldCheck, Sparkles } from "lucide-react";
import { useSystemStatus } from "@/hooks/use-auth";
import { isLocalConvenience } from "@/lib/auth";

// The canonical, authoritative repo - shown by default on every deployment
// (including someone else's clone running on their own machine) unless
// NEXT_PUBLIC_GIT_REPO_URL overrides it, e.g. because that clone runs its
// own self-hosted git server instead of pointing back at this one.
const CANONICAL_GIT_REPO_URL = "https://git.ciagent.org/saksham/CIAgent";

const steps = [
  {
    title: "Add a company",
    body: "Point CI Agent at a competitor's public website and tell it what you actually care about — manufacturing expansion, pricing, hiring, patents, whatever matters to you.",
    icon: Building2,
  },
  {
    title: "Choose a schedule",
    body: "Hourly to monthly, or a custom cron expression. The scheduler picks up changes automatically — no code changes required to add a company.",
    icon: Radar,
  },
  {
    title: "We collect public sources",
    body: "Official site, press releases, RSS/news feeds, SEC filings, GitHub, careers pages, and any custom URLs you add — all fetched through an SSRF-safe, robots.txt-respecting pipeline.",
    icon: ShieldCheck,
  },
  {
    title: "An LLM turns evidence into a report",
    body: "Every claim in the report traces back to a stored source document. Inferences are clearly labeled and confidence-scored — never presented as fact.",
    icon: Sparkles,
  },
  {
    title: "Changes are scored and explained",
    body: "New runs are compared to prior snapshots. Meaningful changes get a severity (Critical/High/Medium/Low) and a confidence score, with noise filtered out.",
    icon: LineChart,
  },
  {
    title: "You get notified",
    body: "Email (and optional SMS) alerts above your chosen severity threshold, with evidence and a link back to the full report in your dashboard.",
    icon: Mail,
  },
];

export default function LandingPage() {
  const { data: systemStatus } = useSystemStatus();
  const isLocalhost = systemStatus ? isLocalConvenience(systemStatus) : false;

  return (
    <main className="min-h-screen">
      <header className="border-b border-slate-200 bg-white">
        <div className="mx-auto flex max-w-6xl items-center justify-between px-6 py-4">
          <span className="text-lg font-semibold tracking-tight text-slate-900">CI&nbsp;Agent</span>
          <nav className="flex items-center gap-3">
            <a
              href={process.env.NEXT_PUBLIC_GIT_REPO_URL || CANONICAL_GIT_REPO_URL}
              target="_blank"
              rel="noopener noreferrer"
              className="rounded-md px-3 py-2 text-sm font-medium text-slate-700 hover:bg-slate-100"
            >
              Git Repository
            </a>
            <Link
              href="/login"
              className="rounded-md px-3 py-2 text-sm font-medium text-slate-700 hover:bg-slate-100"
            >
              Sign in
            </Link>
            <Link
              href="/register"
              className="rounded-md px-3 py-2 text-sm font-medium text-slate-700 hover:bg-slate-100"
            >
              Create account
            </Link>
            <Link
              href="/dashboard"
              className="focus-ring rounded-md bg-brand-600 px-3 py-2 text-sm font-semibold text-white hover:bg-brand-700"
            >
              {isLocalhost ? "Open dashboard (local mode)" : "Open dashboard"}
            </Link>
          </nav>
        </div>
      </header>

      <section className="mx-auto max-w-4xl px-6 py-20 text-center">
        <h1 className="text-4xl font-bold tracking-tight text-slate-900 sm:text-5xl">
          Know what your competitors are doing —{" "}
          <span className="text-brand-600">before it shows up on your roadmap.</span>
        </h1>
        <p className="mx-auto mt-6 max-w-2xl text-lg text-slate-600">
          CI Agent monitors the companies you choose, collects only publicly available information,
          and turns it into evidence-linked intelligence reports with severity- and
          confidence-scored alerts.
        </p>
        <div className="mt-8 flex items-center justify-center gap-3">
          <Link
            href="/dashboard"
            className="focus-ring rounded-md bg-brand-600 px-5 py-3 text-sm font-semibold text-white shadow-sm hover:bg-brand-700"
          >
            {isLocalhost ? "Try it in local mode" : "Try it now"}
          </Link>
          <Link
            href="/register"
            className="focus-ring rounded-md border border-slate-300 bg-white px-5 py-3 text-sm font-semibold text-slate-800 hover:bg-slate-50"
          >
            Create an account
          </Link>
        </div>
      </section>

      <section className="border-t border-slate-200 bg-white py-16">
        <div className="mx-auto max-w-6xl px-6">
          <h2 className="text-center text-2xl font-semibold text-slate-900">
            How monitoring works
          </h2>
          <div className="mt-10 grid gap-8 sm:grid-cols-2 lg:grid-cols-3">
            {steps.map((step) => (
              <div key={step.title} className="rounded-lg border border-slate-200 p-6">
                <step.icon className="h-6 w-6 text-brand-600" aria-hidden />
                <h3 className="mt-4 font-semibold text-slate-900">{step.title}</h3>
                <p className="mt-2 text-sm leading-relaxed text-slate-600">{step.body}</p>
              </div>
            ))}
          </div>
        </div>
      </section>

      <section className="border-t border-slate-200 bg-slate-900 py-14 text-slate-100">
        <div className="mx-auto max-w-4xl px-6 text-center">
          <h2 className="text-xl font-semibold">Only publicly available information</h2>
          <p className="mx-auto mt-3 max-w-2xl text-sm leading-relaxed text-slate-300">
            CI Agent never bypasses CAPTCHAs, login walls, paywalls, or anti-bot controls, and
            respects robots.txt. Every source document keeps its original URL and retrieval
            timestamp, and every source failure is recorded transparently — a report is never
            presented as complete when a source failed to collect.
          </p>
        </div>
      </section>

      <footer className="bg-white py-8">
        <p className="text-center text-xs text-slate-500">
          CI Agent — local-first competitive intelligence monitoring.
        </p>
      </footer>
    </main>
  );
}