"use client";

import { signIn } from "next-auth/react";
import Link from "next/link";
import { useRouter } from "next/navigation";
import { useState } from "react";
import { Button } from "~/components/ui/button";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle
} from "~/components/ui/card";
import { Input } from "~/components/ui/input";
import { Label } from "~/components/ui/label";
import { Logo } from "~/components/ui/logo";

export default function SignInPage() {
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState("");
  const router = useRouter();

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setIsLoading(true);
    setError("");

    try {
      const result = await signIn("credentials", {
        email,
        password,
        redirect: false,
      });

      if (result?.error) {
        setError("Invalid email or password");
      } else {
        router.push("/");
        router.refresh();
      }
    } catch (error: unknown) {
      setError(
        error instanceof Error
          ? error.message
          : "An error occurred. Please try again.",
      );
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <div className="relative flex min-h-screen items-center justify-center overflow-hidden bg-background px-4">
      {/* Background Gradients */}
      <div className="absolute top-0 left-1/2 -z-10 h-[500px] w-[1000px] -translate-x-1/2 rounded-full bg-primary/20 blur-3xl opacity-30 dark:opacity-20" />
      <div className="absolute bottom-0 right-0 -z-10 h-[300px] w-[300px] rounded-full bg-violet-500/10 blur-3xl" />

      <div className="w-full max-w-md animate-in fade-in zoom-in-95 duration-500">
        {/* Header */}
        <div className="mb-8 text-center">
          <Link href="/" className="inline-flex items-center justify-center transition-opacity hover:opacity-80">
            <Logo iconSize="lg" showText={false} />
          </Link>
          <h1 className="mt-6 text-2xl font-bold tracking-tight text-foreground">Welcome back</h1>
          <p className="mt-2 text-sm text-muted-foreground">
            Sign in to your research account
          </p>
        </div>

        {/* Sign In Card */}
        <Card className="border-muted/40 bg-card/50 backdrop-blur-sm shadow-xl">
          <CardHeader>
            <CardTitle>Sign In</CardTitle>
            <CardDescription>
              Enter your credentials to access the platform
            </CardDescription>
          </CardHeader>
          <CardContent>
            <form onSubmit={handleSubmit} className="space-y-4">
              {error && (
                <div className="rounded-md bg-destructive/15 p-3 text-sm text-destructive font-medium border border-destructive/20">
                  {error}
                </div>
              )}

              <div className="space-y-2">
                <Label htmlFor="email">Email</Label>
                <Input
                  id="email"
                  type="email"
                  placeholder="name@example.com"
                  value={email}
                  onChange={(e) => setEmail(e.target.value)}
                  required
                  disabled={isLoading}
                  className="bg-background/50"
                />
              </div>

              <div className="space-y-2">
                <div className="flex items-center justify-between">
                  <Label htmlFor="password">Password</Label>
                  <Link href="#" className="text-xs text-primary hover:underline">Forgot password?</Link>
                </div>
                <Input
                  id="password"
                  type="password"
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  required
                  disabled={isLoading}
                  className="bg-background/50"
                />
              </div>

              <Button type="submit" className="w-full" disabled={isLoading} size="lg">
                {isLoading ? "Signing in..." : "Sign In"}
              </Button>
            </form>

            <div className="mt-6 text-center text-sm text-muted-foreground">
              Don&apos;t have an account?{" "}
              <Link
                href="/auth/signup"
                className="font-medium text-primary hover:text-primary/80"
              >
                Sign up
              </Link>
            </div>
          </CardContent>
        </Card>

        {/* Footer */}
        <div className="mt-8 text-center text-xs text-muted-foreground">
          <p>
            &copy; {new Date().getFullYear()} HRIStudio. All rights reserved.
          </p>
        </div>
      </div>
    </div>
  );
}