"use client";

import { Loader2 } from "lucide-react";
import Link from "next/link";
import { useRouter, useSearchParams } from "next/navigation";
import { Suspense, useState } from "react";
import { Button } from "@/components/ui/button";
import { Card } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { useAuthStore } from "@/store/auth-store";

function LoginContent() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const setUser = useAuthStore((s) => s.setUser);
  const [loading, setLoading] = useState(false);
  const [localError, setLocalError] = useState("");
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");

  const error = searchParams.get("error") ?? localError;
  const redirectTo = searchParams.get("from") || "/dashboard";

  const handleLogin = async (e: React.FormEvent) => {
    e.preventDefault();
    setLoading(true);
    setLocalError("");

    try {
      const res = await fetch("/api/auth/login", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ email, password }),
      });

      const data = (await res.json()) as {
        success?: boolean;
        user?: { id: string; name: string; email: string; initials: string };
        error?: string;
      };

      if (!res.ok || !data.success || !data.user) {
        throw new Error(data.error ?? "Sign in failed");
      }

      setUser(data.user);
      router.replace(redirectTo);
    } catch (err) {
      setLocalError(err instanceof Error ? err.message : "Sign in failed");
      setLoading(false);
    }
  };

  return (
    <div className="flex min-h-screen">
      <aside className="hidden w-[42%] flex-col justify-between bg-brand-700 p-10 text-white lg:flex">
        <div>
          <div className="flex items-center gap-3">
            <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-white/15 text-sm font-bold">
              PS
            </div>
            <span className="text-xl font-semibold tracking-tight">PostSync Pro</span>
          </div>
          <h1 className="mt-16 text-3xl font-bold leading-tight">
            One account. Many projects. Your social channels per project.
          </h1>
          <p className="mt-4 max-w-md text-sm leading-relaxed text-white/80">
            Sign in with your PostSync user account. Connect LinkedIn, Facebook, and other
            platforms separately inside each project under Connected Accounts.
          </p>
        </div>
        <p className="text-xs text-white/50">© PostSync Pro</p>
      </aside>

      <main className="flex flex-1 flex-col items-center justify-center bg-surface px-6 py-12">
        <div className="mb-8 flex items-center gap-2 lg:hidden">
          <div className="flex h-9 w-9 items-center justify-center rounded-lg bg-brand-700 text-xs font-bold text-white">
            PS
          </div>
          <span className="text-lg font-semibold text-gray-900">PostSync Pro</span>
        </div>

        <div className="w-full max-w-md space-y-6">
          <div className="text-center lg:text-left">
            <h2 className="text-2xl font-bold tracking-tight text-gray-900">Sign in</h2>
            <p className="mt-1 text-sm text-gray-500">
              User login — social platforms are connected per project after sign-in
            </p>
          </div>

          <Card className="p-8">
            {error && (
              <div className="mb-4 rounded-lg border border-red-200 bg-red-50 px-4 py-3 text-sm text-red-700">
                {error}
              </div>
            )}

            <form onSubmit={handleLogin} className="space-y-4">
              <Input
                label="Email"
                id="login-email"
                type="email"
                autoComplete="email"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                required
              />
              <Input
                label="Password"
                id="login-password"
                type="password"
                autoComplete="current-password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                required
              />
              <Button type="submit" disabled={loading} className="h-12 w-full text-base">
                {loading ? <Loader2 className="h-5 w-5 animate-spin" /> : null}
                Sign in
              </Button>
            </form>
          </Card>

          <p className="text-center text-xs text-gray-400">
            By continuing you agree to our{" "}
            <Link href="#" className="text-action hover:underline">
              Terms
            </Link>{" "}
            and{" "}
            <Link href="#" className="text-action hover:underline">
              Privacy Policy
            </Link>
            .
          </p>
        </div>
      </main>
    </div>
  );
}

export function LoginForm() {
  return (
    <Suspense
      fallback={
        <div className="flex min-h-screen items-center justify-center bg-surface">
          <Loader2 className="h-8 w-8 animate-spin text-brand-600" />
        </div>
      }
    >
      <LoginContent />
    </Suspense>
  );
}