'use client'

import { createClient } from '@/lib/supabase/client'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Label } from '@/components/ui/label'
import Link from 'next/link'
import { useRouter } from 'next/navigation'
import { useState } from 'react'
import { Mail, Lock, Loader2, ArrowLeft, Key } from 'lucide-react'
import { isPasskeySupported, authenticateWithPasskey } from '@/lib/passkeys'

export default function LoginPage() {
  const [email, setEmail] = useState('')
  const [password, setPassword] = useState('')
  const [error, setError] = useState<string | null>(null)
  const [isLoading, setIsLoading] = useState(false)
  const [isGoogleLoading, setIsGoogleLoading] = useState(false)
  const [isPasskeyLoading, setIsPasskeyLoading] = useState(false)
  const [passkeySupported] = useState(() => isPasskeySupported())
  const router = useRouter()

  const handleLogin = async (e: React.FormEvent) => {
    e.preventDefault()
    const supabase = createClient()
    setIsLoading(true)
    setError(null)

    try {
      const { error } = await supabase.auth.signInWithPassword({
        email,
        password,
      })
      if (error) throw error
      router.push('/dashboard')
    } catch (error: unknown) {
      setError(error instanceof Error ? error.message : 'An error occurred')
    } finally {
      setIsLoading(false)
    }
  }

  const handleGoogleLogin = async () => {
    const supabase = createClient()
    setIsGoogleLoading(true)
    setError(null)

    try {
      const { error } = await supabase.auth.signInWithOAuth({
        provider: 'google',
        options: {
          redirectTo: `${window.location.origin}/auth/callback`,
        },
      })
      if (error) throw error
    } catch (error: unknown) {
      setError(error instanceof Error ? error.message : 'An error occurred')
      setIsGoogleLoading(false)
    }
  }

  const handlePasskeyLogin = async () => {
    const supabase = createClient()
    setIsPasskeyLoading(true)
    setError(null)

    try {
      const credential = await authenticateWithPasskey()
      
      if (!credential) {
        throw new Error('Passkey authentication failed')
      }

      // For now, passkeys are registered as a factor in Supabase
      // This is a placeholder - in production, you'd verify the credential server-side
      console.log('[v0] Passkey authentication initiated:', credential.id)
      
      // Since this is invite-only, users would have pre-registered their passkeys
      // and we'd verify them here. For now, show success.
      setError('Passkey authentication requires server-side verification setup')
    } catch (error: unknown) {
      const message = error instanceof Error ? error.message : 'Passkey authentication failed'
      setError(message)
    } finally {
      setIsPasskeyLoading(false)
    }
  }

  return (
    <div className="min-h-screen bg-background flex items-center justify-center p-4">
      {/* Background elements */}
      <div className="absolute inset-0 overflow-hidden pointer-events-none">
        <div className="absolute top-1/4 left-1/4 w-96 h-96 bg-primary/5 rounded-full blur-3xl" />
        <div className="absolute bottom-1/4 right-1/4 w-96 h-96 bg-primary/5 rounded-full blur-3xl" />
      </div>

      <div className="relative w-full max-w-md">
        {/* Back to home */}
        <Link 
          href="/" 
          className="inline-flex items-center gap-2 text-sm text-muted-foreground hover:text-foreground transition-colors mb-8"
        >
          <ArrowLeft className="w-4 h-4" />
          Back to home
        </Link>

        {/* Card */}
        <div className="bg-card border border-border rounded-2xl p-8">
          {/* Header */}
          <div className="text-center mb-8">
            <Link href="/" className="inline-block mb-6">
              <span className="text-2xl font-bold">
                Cloud<span className="text-primary">rite</span>
              </span>
            </Link>
            <h1 className="text-2xl font-bold mb-2">Welcome back</h1>
            <p className="text-muted-foreground">
              Sign in to your account to continue
            </p>
          </div>

          {/* Passkey Button */}
          {passkeySupported && (
            <Button
              type="button"
              variant="outline"
              className="w-full h-12 mb-4 relative"
              onClick={handlePasskeyLogin}
              disabled={isPasskeyLoading}
            >
              {isPasskeyLoading ? (
                <Loader2 className="w-5 h-5 animate-spin" />
              ) : (
                <>
                  <Key className="w-5 h-5 mr-2" />
                  Sign in with passkey
                </>
              )}
            </Button>
          )}

          {/* Google OAuth Button */}
          <Button
            type="button"
            variant="outline"
            className="w-full h-12 mb-6 relative"
            onClick={handleGoogleLogin}
            disabled={isGoogleLoading}
          >
            {isGoogleLoading ? (
              <Loader2 className="w-5 h-5 animate-spin" />
            ) : (
              <>
                <svg className="w-5 h-5 mr-2" viewBox="0 0 24 24">
                  <path
                    fill="currentColor"
                    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"
                  />
                  <path
                    fill="currentColor"
                    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"
                  />
                  <path
                    fill="currentColor"
                    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"
                  />
                  <path
                    fill="currentColor"
                    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"
                  />
                </svg>
                Continue with Google
              </>
            )}
          </Button>

          {/* Divider */}
          <div className="relative mb-6">
            <div className="absolute inset-0 flex items-center">
              <div className="w-full border-t border-border" />
            </div>
            <div className="relative flex justify-center text-xs uppercase">
              <span className="bg-card px-2 text-muted-foreground">
                Or continue with email
              </span>
            </div>
          </div>

          {/* Email/Password Form */}
          <form onSubmit={handleLogin} className="space-y-4">
            <div className="space-y-2">
              <Label htmlFor="email">Email</Label>
              <div className="relative">
                <Mail className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
                <Input
                  id="email"
                  type="email"
                  placeholder="you@example.com"
                  required
                  value={email}
                  onChange={(e) => setEmail(e.target.value)}
                  className="pl-10 h-12"
                />
              </div>
            </div>

            <div className="space-y-2">
              <Label htmlFor="password">Password</Label>
              <div className="relative">
                <Lock className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
                <Input
                  id="password"
                  type="password"
                  placeholder="Enter your password"
                  required
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  className="pl-10 h-12"
                />
              </div>
            </div>

            {error && (
              <div className="p-3 bg-destructive/10 border border-destructive/50 rounded-lg">
                <p className="text-sm text-destructive">{error}</p>
              </div>
            )}

            <Button 
              type="submit" 
              className="w-full h-12 bg-primary hover:bg-primary/90 text-primary-foreground"
              disabled={isLoading}
            >
              {isLoading ? (
                <Loader2 className="w-5 h-5 animate-spin" />
              ) : (
                'Sign in'
              )}
            </Button>
          </form>

          {/* Footer */}
          <p className="text-center text-sm text-muted-foreground mt-6">
            Need an account?{' '}
            <a
              href="mailto:contact@cloudrite.co.nz"
              className="text-primary hover:underline font-medium"
            >
              Contact us
            </a>
            {' '}to request access.
          </p>
        </div>
      </div>
    </div>
  )
}