// app/login/page.tsx
"use client";

import { FormEvent, useMemo, useState, Suspense } from "react";
import { useRouter, useSearchParams } from "next/navigation";
import Link from "next/link";
import { useAuth } from "@/context/AuthContext";
import { Button, Field, Input } from "@/components/ui/form";

const API_BASE_URL =
  process.env.NEXT_PUBLIC_API_BASE_URL ?? "";

function LoginPageContent() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const { login, refreshUser, loading } = useAuth();

  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");

  const [error, setError] = useState<string | null>(null);

  // Magic link UI state (separate from password login)
  const [magicLoading, setMagicLoading] = useState(false);
  const [magicMessage, setMagicMessage] = useState<string | null>(null);
  const [magicError, setMagicError] = useState<string | null>(null);

  const next = useMemo(
    () => searchParams.get("next") || "/builder",
    [searchParams]
  );

  async function handleSubmit(e: FormEvent) {
    e.preventDefault();
    setError(null);

    try {
      await login({ email, password });
      await refreshUser();
      router.push(next);
    } catch (err: any) {
      setError(err?.message ?? "Failed to log in");
    }
  }

  async function handleMagicLinkRequest() {
    setMagicMessage(null);
    setMagicError(null);

    const normalizedEmail = email.trim();

    if (!normalizedEmail) {
      setMagicError("Please enter your email above first.");
      return;
    }

    setMagicLoading(true);

    try {
      // ✅ This endpoint exists in your AuthController:
      // POST /api/auth/beta/signup  { email, useCase }
      const res = await fetch(`${API_BASE_URL}/api/auth/beta/signup`, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          email: normalizedEmail,
          useCase: "login_magic",
        }),
      });

      // Soft-fail (avoid email enumeration)
      if (!res.ok) {
        const text = await res.text().catch(() => "");
        console.error("Magic link request failed:", res.status, text);
      }

      setMagicMessage(
        "If that email is eligible, you’ll get a sign-in link shortly ✨"
      );
    } catch (e) {
      console.error(e);
      // Soft-fail
      setMagicMessage(
        "If that email is eligible, you’ll get a sign-in link shortly ✨"
      );
    } finally {
      setMagicLoading(false);
    }
  }

  return (
    <main className="min-h-screen bg-black text-zinc-50">
      <div className="mx-auto flex max-w-md flex-col px-4 py-10">
        <h1 className="text-2xl font-semibold tracking-tight">
          Log In to <span className="text-amber-300">The Builder</span>
        </h1>
        <p className="mt-2 text-sm text-zinc-400">
          Use your beta credentials to get back to your saved builds.
        </p>

        {/* Password Login */}
        <form onSubmit={handleSubmit} className="mt-6 space-y-4">
          {error && (
            <div className="rounded-md border border-red-500/40 bg-red-500/10 px-3 py-2 text-sm text-red-200">
              {error}
            </div>
          )}

          <Field label="Email" htmlFor="email">
            <Input
              id="email"
              type="email"
              autoComplete="email"
              required
              value={email}
              onChange={(e) => setEmail(e.target.value)}
            />
          </Field>

          <Field label="Password" htmlFor="password">
            <Input
              id="password"
              type="password"
              autoComplete="current-password"
              required
              value={password}
              onChange={(e) => setPassword(e.target.value)}
            />
          </Field>

          <Button type="submit" disabled={loading}>
            {loading ? "Signing in…" : "Log In"}
          </Button>
        </form>

        {/* Divider */}
        <div className="mt-8 flex items-center gap-3">
          <div className="h-px flex-1 bg-white/10" />
          <span className="text-xs text-zinc-500">or</span>
          <div className="h-px flex-1 bg-white/10" />
        </div>

        {/* Magic Link Request */}
        <div className="mt-6 space-y-3">
          <div>
            <h2 className="text-sm font-medium text-zinc-200">
              Already a beta user?
            </h2>
            <p className="mt-1 text-xs text-zinc-500">
              Request a one-time sign-in link (no password needed).
            </p>
          </div>

          {magicError && (
            <div className="rounded-md border border-red-500/40 bg-red-500/10 px-3 py-2 text-sm text-red-200">
              {magicError}
            </div>
          )}

          {magicMessage && (
            <div className="rounded-md border border-emerald-500/30 bg-emerald-500/10 px-3 py-2 text-sm text-emerald-200">
              {magicMessage}
            </div>
          )}

          <Button
            type="button"
            disabled={magicLoading}
            onClick={handleMagicLinkRequest}
          >
            {magicLoading ? "Sending link…" : "Email me a sign-in link"}
          </Button>

          <p className="text-[11px] text-zinc-500">
            Tip: check spam/promotions. Links expire.
          </p>
        </div>

        <p className="mt-8 text-xs text-zinc-500">
          New here?{" "}
          <Link href="/register" className="text-amber-300 hover:text-amber-200">
            Join the beta
          </Link>
          .
        </p>
      </div>
    </main>
  );
}

export default function LoginPage() {
  return (
    <Suspense fallback={
      <main className="min-h-screen bg-black text-zinc-50">
        <div className="mx-auto flex max-w-md flex-col px-4 py-10">
          <div className="h-8 w-48 animate-pulse bg-zinc-800 rounded" />
        </div>
      </main>
    }>
      <LoginPageContent />
    </Suspense>
  );
}
