import { useState } from 'react'
import { Link, useNavigate } from 'react-router-dom'
import { useAuth } from '@/context/AuthContext'
import type { IdentifierType } from '@/lib/crypto'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
import { Label } from '@/components/ui/label'

const identifierOptions: Array<{ label: string; value: IdentifierType }> = [
  { label: 'Email', value: 'email' },
  { label: 'Username', value: 'username' },
  { label: 'Mobile number', value: 'mobile' },
]

export function LoginPage() {
  const navigate = useNavigate()
  const { signIn } = useAuth()
  const [identifierType, setIdentifierType] = useState<IdentifierType>('email')
  const [identifier, setIdentifier] = useState('')
  const [password, setPassword] = useState('')
  const [error, setError] = useState('')
  const [isSubmitting, setIsSubmitting] = useState(false)

  async function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
    event.preventDefault()
    setIsSubmitting(true)
    setError('')

    try {
      await signIn({ identifierType, identifier, password })
      navigate('/workspace')
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Authentication failed.')
    } finally {
      setIsSubmitting(false)
    }
  }

  return (
    <div className="flex items-center justify-center p-6 sm:p-10 lg:p-16">
      <Card className="w-full max-w-md">
        <CardHeader className="text-center">
          <CardTitle className="text-2xl">Welcome back</CardTitle>
          <CardDescription>
            Sign in to access your encrypted workspace.
          </CardDescription>
        </CardHeader>
        <CardContent>
          <form onSubmit={handleSubmit} className="grid gap-4">
            <div className="grid gap-2">
              <Label htmlFor="identifier-type">Identifier type</Label>
              <select
                id="identifier-type"
                value={identifierType}
                onChange={(e) => setIdentifierType(e.target.value as IdentifierType)}
                className="flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring"
              >
                {identifierOptions.map((option) => (
                  <option key={option.value} value={option.value}>
                    {option.label}
                  </option>
                ))}
              </select>
            </div>

            <div className="grid gap-2">
              <Label htmlFor="identifier">
                {identifierType === 'email' ? 'Email' : identifierType === 'username' ? 'Username' : 'Mobile number'}
              </Label>
              <Input
                id="identifier"
                value={identifier}
                onChange={(e) => setIdentifier(e.target.value)}
                placeholder={identifierType === 'mobile' ? '+15555550123' : 'Enter your identifier'}
                autoComplete={identifierType === 'email' ? 'email' : 'off'}
                required
              />
            </div>

            <div className="grid gap-2">
              <Label htmlFor="password">Password</Label>
              <Input
                id="password"
                type="password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                placeholder="Enter your password"
                autoComplete="current-password"
                required
              />
            </div>

            {error && <p className="text-sm text-destructive">{error}</p>}

            <Button type="submit" disabled={isSubmitting} className="w-full">
              {isSubmitting ? 'Signing in...' : 'Sign in'}
            </Button>
          </form>

          <div className="mt-4 text-center text-sm text-muted-foreground">
            Don&apos;t have an account?{' '}
            <Link to="/signup" className="text-primary underline-offset-4 hover:underline">
              Sign up
            </Link>
          </div>
        </CardContent>
      </Card>
    </div>
  )
}