page.tsx

'use client'

import { useState, useEffect } from 'react'
import Link from 'next/link'
import { useRouter, useSearchParams } from 'next/navigation'
import { useAuth } from '@/lib/auth-context'
import toast from 'react-hot-toast'

export default function LoginPage() {
  const { signIn, signInWithGoogle, user, loading } = useAuth()
  const router = useRouter()
  const searchParams = useSearchParams()

  const [email, setEmail] = useState('')
  const [password, setPassword] = useState('')
  const [isSubmitting, setIsSubmitting] = useState(false)
  const [isGoogleLoading, setIsGoogleLoading] = useState(false)

  // Show any errors coming back from the OAuth callback
  useEffect(() => {
    const error = searchParams.get('error')
    if (error) toast.error(decodeURIComponent(error))
  }, [searchParams])

  // Redirect already-logged-in users
  useEffect(() => {
    if (!loading && user) router.replace('/dashboard')
  }, [user, loading, router])

  const handleEmailLogin = async (e: React.FormEvent) => {
    e.preventDefault()
    if (!email || !password) return toast.error('Please fill in all fields')

    setIsSubmitting(true)
    const { error } = await signIn(email, password)
    setIsSubmitting(false)

    if (error) {
      // Make common Supabase error messages friendlier
      if (error.includes('Invalid login credentials')) {
        toast.error('Incorrect email or password')
      } else if (error.includes('Email not confirmed')) {
        toast.error('Please confirm your email before signing in')
      } else {
        toast.error(error)
      }
    }
    // signIn() handles the redirect on success
  }

  const handleGoogleLogin = async () => {
    setIsGoogleLoading(true)
    const { error } = await signInWithGoogle()
    if (error) {
      toast.error(error)
      setIsGoogleLoading(false)
    }
    // Page will redirect to Google — no need to setIsGoogleLoading(false)
  }

  if (loading) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-gray-50">
        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-green-600" />
      </div>
    )
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50 px-4">
      <div className="w-full max-w-md">
        {/* Logo / Header */}
        <div className="text-center mb-8">
          <Link href="/" className="text-2xl font-bold text-green-600">
            TaskCloud
          </Link>
          <h1 className="mt-4 text-2xl font-semibold text-gray-900">Welcome back</h1>
          <p className="mt-1 text-sm text-gray-500">Sign in to your account</p>
        </div>

        <div className="bg-white rounded-2xl shadow-sm border border-gray-200 p-8 space-y-6">
          {/* Google OAuth */}
          <button
            type="button"
            onClick={handleGoogleLogin}
            disabled={isGoogleLoading || isSubmitting}
            className="w-full flex items-center justify-center gap-3 px-4 py-2.5 border border-gray-300 rounded-lg text-sm font-medium text-gray-700 bg-white hover:bg-gray-50 transition disabled:opacity-50 disabled:cursor-not-allowed"
          >
            {isGoogleLoading ? (
              <span className="animate-spin rounded-full h-4 w-4 border-b-2 border-gray-600" />
            ) : (
              <svg className="h-5 w-5" 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 4.93l3.66-2.84z"
                  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>

          <div className="relative">
            <div className="absolute inset-0 flex items-center">
              <div className="w-full border-t border-gray-200" />
            </div>
            <div className="relative flex justify-center text-xs text-gray-400 uppercase">
              <span className="bg-white px-3">or</span>
            </div>
          </div>

          {/* Email / Password */}
          <form onSubmit={handleEmailLogin} className="space-y-4">
            <div>
              <label htmlFor="email" className="block text-sm font-medium text-gray-700 mb-1">
                Email
              </label>
              <input
                id="email"
                type="email"
                autoComplete="email"
                required
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                className="w-full px-3 py-2 border border-gray-300 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-green-500 focus:border-transparent"
                placeholder="you@example.com"
              />
            </div>

            <div>
              <div className="flex justify-between items-center mb-1">
                <label htmlFor="password" className="block text-sm font-medium text-gray-700">
                  Password
                </label>
                <Link
                  href="/auth/forgot-password"
                  className="text-xs text-green-600 hover:text-green-700"
                >
                  Forgot password?
                </Link>
              </div>
              <input
                id="password"
                type="password"
                autoComplete="current-password"
                required
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                className="w-full px-3 py-2 border border-gray-300 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-green-500 focus:border-transparent"
                placeholder="••••••••"
              />
            </div>

            <button
              type="submit"
              disabled={isSubmitting || isGoogleLoading}
              className="w-full py-2.5 px-4 bg-green-600 text-white text-sm font-medium rounded-lg hover:bg-green-700 transition disabled:opacity-50 disabled:cursor-not-allowed"
            >
              {isSubmitting ? 'Signing in…' : 'Sign in'}
            </button>
          </form>

          <p className="text-center text-sm text-gray-500">
            Don&apos;t have an account?{' '}
            <Link href="/auth/signup" className="text-green-600 font-medium hover:text-green-700">
              Sign up
            </Link>
          </p>
        </div>
      </div>
    </div>
  )
}