"use client";

import { useState, useTransition } from "react";
import { useRouter } from "next/navigation";
import Link from "next/link";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { Flame } from "lucide-react";
import { registerSchema, type RegisterInput } from "@/schemas/auth.schema";
import { registerUser } from "./actions";
import { loginAction } from "../login/actions";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form";
import { APP_NAME } from "@/lib/constants";

export default function RegisterPage() {
  const router = useRouter();
  const [error, setError] = useState<string | null>(null);
  const [isPending, startTransition] = useTransition();

  const form = useForm<RegisterInput>({
    resolver: zodResolver(registerSchema) as any,
    defaultValues: { name: "", email: "", password: "", confirmPassword: "" },
  });

  function onSubmit(values: RegisterInput) {
    setError(null);
    startTransition(async () => {
      const result = await registerUser(values);

      if (!result.success) {
        setError(result.error);
        return;
      }

      // Auto-login after registration using server action
      try {
        const loginResult = await loginAction({
          email: values.email,
          password: values.password,
        });

        if (loginResult?.error) {
          setError("Account created but sign in failed. Please try logging in.");
          return;
        }

        router.push("/dashboard");
        router.refresh();
      } catch {
        // Redirect from server action
        router.push("/dashboard");
        router.refresh();
      }
    });
  }

  return (
    <>
      <div className="flex flex-col items-center gap-2 text-center">
        <Flame className="h-10 w-10 text-primary" />
        <h1 className="text-2xl font-bold tracking-tight">{APP_NAME}</h1>
        <p className="text-sm text-muted-foreground">Create an account to get started</p>
      </div>

      <Card>
        <CardHeader>
          <CardTitle>Create Account</CardTitle>
          <CardDescription>Fill in your details below</CardDescription>
        </CardHeader>
        <CardContent>
          <Form {...form}>
            <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-4">
              {error && (
                <div className="rounded-md bg-destructive/10 p-3 text-sm text-destructive">
                  {error}
                </div>
              )}

              <FormField
                control={form.control}
                name="name"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Name</FormLabel>
                    <FormControl>
                      <Input placeholder="Your name" autoComplete="name" {...field} />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              <FormField
                control={form.control}
                name="email"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Email</FormLabel>
                    <FormControl>
                      <Input
                        type="email"
                        placeholder="you@example.com"
                        autoComplete="email"
                        {...field}
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              <FormField
                control={form.control}
                name="password"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Password</FormLabel>
                    <FormControl>
                      <Input
                        type="password"
                        placeholder="At least 6 characters"
                        autoComplete="new-password"
                        {...field}
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              <FormField
                control={form.control}
                name="confirmPassword"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Confirm Password</FormLabel>
                    <FormControl>
                      <Input
                        type="password"
                        placeholder="Repeat your password"
                        autoComplete="new-password"
                        {...field}
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              <Button type="submit" className="w-full" disabled={isPending}>
                {isPending ? "Creating account..." : "Create Account"}
              </Button>
            </form>
          </Form>

          <p className="mt-4 text-center text-sm text-muted-foreground">
            Already have an account?{" "}
            <Link href="/login" className="text-primary underline-offset-4 hover:underline">
              Sign in
            </Link>
          </p>
        </CardContent>
      </Card>
    </>
  );
}