"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
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 { Separator } from "@/components/ui/separator";
import { signUpWithEmail, signInWithEmail, signInWithGoogle, signInWithGitHub } from "@/lib/firebase/auth";
import { Github, Loader2 } from "lucide-react";
import { toast } from "sonner";

export default function AuthPage() {
  const router = useRouter();
  const [isSignUp, setIsSignUp] = useState(false);
  const [isLoading, setIsLoading] = useState(false);
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [displayName, setDisplayName] = useState("");

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

    try {
      if (isSignUp) {
        if (!displayName.trim()) {
          toast.error("Please enter your name");
          setIsLoading(false);
          return;
        }
        const { workspace } = await signUpWithEmail(email, password, displayName);
        toast.success("Account created successfully!");
        router.push(`/${workspace}/projects`);
      } else {
        await signInWithEmail(email, password);
        toast.success("Signed in successfully!");
        // Get user's workspace from Firestore
        router.push(`/marks-account/projects`); // TODO: Get actual workspace
      }
    } catch (error: any) {
      toast.error(error.message);
    } finally {
      setIsLoading(false);
    }
  };

  const handleGoogleSignIn = async () => {
    setIsLoading(true);
    try {
      await signInWithGoogle();
      toast.success("Signed in with Google!");
      router.push(`/marks-account/projects`); // TODO: Get actual workspace
    } catch (error: any) {
      toast.error(error.message);
    } finally {
      setIsLoading(false);
    }
  };

  const handleGitHubSignIn = async () => {
    setIsLoading(true);
    try {
      await signInWithGitHub();
      toast.success("Signed in with GitHub!");
      router.push(`/marks-account/projects`); // TODO: Get actual workspace
    } catch (error: any) {
      toast.error(error.message);
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <div className="flex min-h-screen items-center justify-center bg-background p-4">
      <div className="w-full max-w-md space-y-6">
        {/* Logo */}
        <div className="flex justify-center">
          <img 
            src="/vibn-black-circle-logo.png" 
            alt="Vib'n" 
            className="h-16 w-16"
          />
        </div>

        {/* Auth Card */}
        <Card>
          <CardHeader className="space-y-1">
            <CardTitle className="text-2xl font-bold text-center">
              {isSignUp ? "Create your account" : "Welcome back"}
            </CardTitle>
            <CardDescription className="text-center">
              {isSignUp 
                ? "Sign up to start building with Vib'n" 
                : "Sign in to continue to Vib'n"}
            </CardDescription>
          </CardHeader>
          <CardContent className="space-y-4">
            {/* Social Sign In */}
            <div className="space-y-2">
              <Button
                type="button"
                variant="outline"
                className="w-full"
                onClick={handleGoogleSignIn}
                disabled={isLoading}
              >
                <svg className="mr-2 h-4 w-4" viewBox="0 0 24 24">
                  <path
                    d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z"
                    fill="#4285F4"
                  />
                  <path
                    d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"
                    fill="#34A853"
                  />
                  <path
                    d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"
                    fill="#FBBC05"
                  />
                  <path
                    d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"
                    fill="#EA4335"
                  />
                </svg>
                Continue with Google
              </Button>

              <Button
                type="button"
                variant="outline"
                className="w-full"
                onClick={handleGitHubSignIn}
                disabled={isLoading}
              >
                <Github className="mr-2 h-4 w-4" />
                Continue with GitHub
              </Button>
            </div>

            <div className="relative">
              <div className="absolute inset-0 flex items-center">
                <Separator />
              </div>
              <div className="relative flex justify-center text-xs uppercase">
                <span className="bg-background px-2 text-muted-foreground">
                  Or continue with email
                </span>
              </div>
            </div>

            {/* Email Sign In Form */}
            <form onSubmit={handleEmailAuth} className="space-y-4">
              {isSignUp && (
                <div className="space-y-2">
                  <Label htmlFor="name">Name</Label>
                  <Input
                    id="name"
                    placeholder="John Doe"
                    value={displayName}
                    onChange={(e) => setDisplayName(e.target.value)}
                    disabled={isLoading}
                    required
                  />
                </div>
              )}

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

              <div className="space-y-2">
                <Label htmlFor="password">Password</Label>
                <Input
                  id="password"
                  type="password"
                  placeholder="••••••••"
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  disabled={isLoading}
                  required
                  minLength={6}
                />
                {isSignUp && (
                  <p className="text-xs text-muted-foreground">
                    Must be at least 6 characters
                  </p>
                )}
              </div>

              <Button
                type="submit"
                className="w-full"
                disabled={isLoading}
              >
                {isLoading ? (
                  <>
                    <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                    {isSignUp ? "Creating account..." : "Signing in..."}
                  </>
                ) : (
                  <>{isSignUp ? "Create account" : "Sign in"}</>
                )}
              </Button>
            </form>

            {/* Toggle Sign Up/Sign In */}
            <div className="text-center text-sm">
              <span className="text-muted-foreground">
                {isSignUp ? "Already have an account?" : "Don't have an account?"}
              </span>{" "}
              <button
                type="button"
                onClick={() => setIsSignUp(!isSignUp)}
                className="text-primary hover:underline font-medium"
                disabled={isLoading}
              >
                {isSignUp ? "Sign in" : "Sign up"}
              </button>
            </div>
          </CardContent>
        </Card>

        {/* Footer */}
        <p className="text-center text-xs text-muted-foreground">
          By continuing, you agree to our Terms of Service and Privacy Policy.
        </p>
      </div>
    </div>
  );
}