"use client";
import { useState } from "react";
import { useRouter } from "next/navigation";
import { Lock, Loader2, GitBranch } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";

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

  async function onSubmit(e: React.FormEvent) {
    e.preventDefault();
    setLoading(true);
    setError(null);
    const res = await fetch("/api/auth/login", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ password }),
    });
    setLoading(false);
    if (res.ok) {
      router.push("/");
      router.refresh();
    } else {
      setError("Mật khẩu không đúng");
    }
  }

  return (
    <main className="relative flex min-h-screen items-center justify-center overflow-hidden p-4">
      <div
        aria-hidden
        className="pointer-events-none absolute inset-0 grid-bg opacity-40"
      />
      <div
        aria-hidden
        className="pointer-events-none absolute left-1/2 top-1/2 -z-0 h-[600px] w-[600px] -translate-x-1/2 -translate-y-1/2 rounded-full bg-primary/10 blur-3xl"
      />

      <div className="relative w-full max-w-sm space-y-6 animate-fade-in">
        <div className="flex flex-col items-center text-center">
          <div className="flex h-12 w-12 items-center justify-center rounded-xl bg-primary/15 ring-1 ring-primary/30 shadow-glow">
            <GitBranch className="h-6 w-6 text-primary" />
          </div>
          <h1 className="mt-4 text-xl font-semibold tracking-tight">Project Manager</h1>
          <p className="mt-1.5 text-sm text-muted-foreground">
            Bảng điều khiển dự án và deploy tự host
          </p>
        </div>

        <div className="surface p-6">
          <form onSubmit={onSubmit} className="space-y-4">
            <div className="space-y-2">
              <Label htmlFor="password" className="text-2xs font-medium uppercase tracking-wider text-muted-foreground">
                Mật khẩu
              </Label>
              <div className="relative">
                <Lock className="pointer-events-none absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-muted-foreground/60" />
                <Input
                  id="password"
                  type="password"
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  className="pl-9"
                  autoFocus
                  required
                />
              </div>
            </div>
            {error && (
              <p className="rounded-md border border-destructive/30 bg-destructive/10 px-3 py-2 text-xs text-destructive">
                {error}
              </p>
            )}
            <Button type="submit" size="lg" className="w-full" disabled={loading}>
              {loading ? <Loader2 className="h-4 w-4 animate-spin" /> : null}
              {loading ? "Đang đăng nhập…" : "Đăng nhập"}
            </Button>
          </form>
        </div>

        <p className="text-center text-2xs uppercase tracking-wider text-muted-foreground">
          Mật khẩu duy nhất · chỉ truy cập trong LAN
        </p>
      </div>
    </main>
  );
}