'use client';

import { useState } from 'react';
import { useRouter } from 'next/navigation';
import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod';
import { toast } from 'sonner';
import { api } from '@/lib/api';
import { useAuthStore } from '@/lib/auth-store';
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 { Loader2 } from 'lucide-react';

const loginSchema = z.object({
  tenantSlug: z.string().min(1, 'Tenant slug is required'),
  email: z.string().email('Invalid email address'),
  password: z.string().min(6, 'Password must be at least 6 characters'),
});

type LoginForm = z.infer<typeof loginSchema>;

export default function LoginPage() {
  const router = useRouter();
  const setAuth = useAuthStore((s) => s.setAuth);
  const [loading, setLoading] = useState(false);

  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm<LoginForm>({
    resolver: zodResolver(loginSchema),
  });

  const onSubmit = async (data: LoginForm) => {
    setLoading(true);
    try {
      const res = await api.post('/api/v1/auth/login', data);
      const { accessToken, user } = res.data;
      setAuth({ accessToken, tenantSlug: data.tenantSlug, user });
      toast.success('Welcome back, ' + user.firstName + '!');
      router.push('/dashboard');
    } catch (err: unknown) {
      const error = err as { response?: { data?: { message?: string } } };
      toast.error(error.response?.data?.message || 'Login failed. Check your credentials.');
    } finally {
      setLoading(false);
    }
  };

  return (
    <div
      className="min-h-screen flex items-center justify-center p-4"
      style={{ backgroundColor: '#F8FAFC' }}
    >
      <div className="w-full max-w-md">
        {/* Logo */}
        <div className="text-center mb-8">
          <div
            className="w-12 h-12 rounded-xl flex items-center justify-center text-white font-bold text-xl mx-auto mb-3"
            style={{ backgroundColor: '#0891B2' }}
          >
            F
          </div>
          <h1 className="text-2xl font-bold text-slate-800">FiberOps</h1>
          <p className="text-slate-500 text-sm mt-1">ISP Management Platform</p>
        </div>

        <Card className="shadow-sm">
          <CardHeader>
            <CardTitle className="text-lg">Sign in to your account</CardTitle>
            <CardDescription>Enter your tenant and credentials to continue</CardDescription>
          </CardHeader>
          <CardContent>
            <form onSubmit={handleSubmit(onSubmit)} className="space-y-4">
              <div className="space-y-1.5">
                <Label htmlFor="tenantSlug">Tenant Slug</Label>
                <Input
                  id="tenantSlug"
                  placeholder="e.g. demo-isp"
                  {...register('tenantSlug')}
                />
                {errors.tenantSlug && (
                  <p className="text-xs text-red-500">{errors.tenantSlug.message}</p>
                )}
              </div>

              <div className="space-y-1.5">
                <Label htmlFor="email">Email</Label>
                <Input
                  id="email"
                  type="email"
                  placeholder="admin@yourisp.com"
                  {...register('email')}
                />
                {errors.email && (
                  <p className="text-xs text-red-500">{errors.email.message}</p>
                )}
              </div>

              <div className="space-y-1.5">
                <Label htmlFor="password">Password</Label>
                <Input
                  id="password"
                  type="password"
                  placeholder="••••••••"
                  {...register('password')}
                />
                {errors.password && (
                  <p className="text-xs text-red-500">{errors.password.message}</p>
                )}
              </div>

              <Button
                type="submit"
                className="w-full"
                disabled={loading}
                style={{ backgroundColor: '#0891B2' }}
              >
                {loading ? (
                  <>
                    <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                    Signing in…
                  </>
                ) : (
                  'Sign In'
                )}
              </Button>
            </form>
          </CardContent>
        </Card>
      </div>
    </div>
  );
}