"use client";

import { useState } from "react";
import { useRouter, useSearchParams } from "next/navigation";
import { Terminal } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Alert, AlertDescription } from "@/components/ui/alert";

export function LoginForm() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState<string | null>(null);
  const [pending, setPending] = useState(false);

  async function handleSubmit(event: React.FormEvent) {
    event.preventDefault();
    setPending(true);
    setError(null);

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

    if (response.ok) {
      const next = searchParams.get("next") ?? "/";
      router.push(next);
      router.refresh();
      return;
    }

    const data = await response.json().catch(() => ({}));
    setError(data.error ?? "Login failed");
    setPending(false);
  }

  return (
    <Card className="w-full max-w-sm">
      <CardHeader>
        <div className="flex items-center gap-2">
          <Terminal className="text-primary size-5" />
          <CardTitle>TriggerShell</CardTitle>
        </div>
        <CardDescription>
          Sign in to run and monitor your configured scripts.
        </CardDescription>
      </CardHeader>
      <CardContent>
        <form onSubmit={handleSubmit} className="flex flex-col gap-4">
          {error && (
            <Alert variant="destructive">
              <AlertDescription>{error}</AlertDescription>
            </Alert>
          )}
          <div className="flex flex-col gap-2">
            <Label htmlFor="username">Username</Label>
            <Input
              id="username"
              autoComplete="username"
              value={username}
              onChange={(event) => setUsername(event.target.value)}
              required
            />
          </div>
          <div className="flex flex-col gap-2">
            <Label htmlFor="password">Password</Label>
            <Input
              id="password"
              type="password"
              autoComplete="current-password"
              value={password}
              onChange={(event) => setPassword(event.target.value)}
              required
            />
          </div>
          <Button type="submit" disabled={pending} className="mt-2">
            {pending ? "Signing in..." : "Sign in"}
          </Button>
        </form>
      </CardContent>
    </Card>
  );
}