"use client";

import Link from "next/link";
import { useRouter } from "next/navigation";
import { FormEvent, useMemo, useState } from "react";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { isDemoMode } from "@/lib/data-store";
import { createBrowserClient } from "@/lib/supabase/client";

export default function LoginPage() {
  const router = useRouter();
  const demoMode = useMemo(() => isDemoMode(), []);
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);

  const onSubmit = async (e: FormEvent) => {
    e.preventDefault();
    setError(null);

    if (demoMode) {
      router.push("/demo");
      return;
    }

    try {
      setLoading(true);
      const supabase = createBrowserClient();
      const { error: authError } = await supabase.auth.signInWithPassword({ email, password });
      if (authError) throw authError;
      router.push("/dashboard");
    } catch (err) {
      setError(err instanceof Error ? err.message : "Unable to sign in.");
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="flex min-h-screen items-center justify-center bg-slate-950 p-4">
      <Card className="w-full max-w-md">
        <CardHeader>
          <CardTitle>Welcome back to BrandLxft</CardTitle>
          <p className="text-sm text-slate-400">Your AI Co-Founder for Growth</p>
        </CardHeader>
        <CardContent className="space-y-4">
          <form onSubmit={onSubmit} className="space-y-3">
            <Input placeholder="Email" type="email" value={email} onChange={(e) => setEmail(e.target.value)} required />
            <Input
              placeholder="Password"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              required
            />
            {error ? <p className="text-sm text-rose-400">{error}</p> : null}
            <Button className="w-full" type="submit" disabled={loading}>
              {loading ? "Signing in..." : "Log In"}
            </Button>
          </form>

          <Button variant="outline" className="w-full" onClick={() => router.push("/demo")}>
            Explore live demos
          </Button>

          <Button variant="ghost" className="w-full text-slate-400" onClick={() => router.push("/onboarding")}>
            Start from scratch
          </Button>

          <p className="text-sm text-slate-400">
            No account yet?{" "}
            <Link href="/signup" className="text-sky-400 hover:underline">
              Create one
            </Link>
          </p>
        </CardContent>
      </Card>
    </div>
  );
}