'use client'

import { useState, useEffect, type FormEvent } from 'react'
import { useRouter } from 'next/navigation'
import { useAuth } from '@/contexts/auth-context'
import { getApiError } from '@/lib/api'
import { Input } from '@/components/ui/input'
import { Button } from '@/components/ui/button'
import { Label } from '@/components/ui/label'

export default function LoginPage() {
  const { login, user, loading } = useAuth()
  const router = useRouter()
  const [identifier, setIdentifier] = useState('')
  const [password, setPassword] = useState('')
  const [error, setError] = useState<string | null>(null)
  const [submitting, setSubmitting] = useState(false)

  useEffect(() => {
    if (!loading && user) {
      router.replace('/')
    }
  }, [user, loading, router])

  async function handleSubmit(e: FormEvent) {
    e.preventDefault()
    setError(null)
    setSubmitting(true)
    try {
      await login(identifier, password)
    } catch (err) {
      setError(getApiError(err))
    } finally {
      setSubmitting(false)
    }
  }

  return (
    <div className="flex min-h-svh items-center justify-center bg-background">
      <form onSubmit={handleSubmit} className="flex w-full max-w-sm flex-col gap-6 p-6">
        <div className="flex flex-col gap-1 text-center">
          <h1 className="text-2xl font-semibold text-foreground">Sign in</h1>
          <p className="text-sm text-muted-foreground">Distribution ERP</p>
        </div>

        <div className="flex flex-col gap-4">
          <div className="flex flex-col gap-1.5">
            <Label htmlFor="identifier">Email</Label>
            <Input
              id="identifier"
              type="email"
              autoComplete="email"
              required
              value={identifier}
              onChange={(e) => setIdentifier(e.target.value)}
            />
          </div>

          <div className="flex flex-col gap-1.5">
            <Label htmlFor="password">Password</Label>
            <Input
              id="password"
              type="password"
              autoComplete="current-password"
              required
              value={password}
              onChange={(e) => setPassword(e.target.value)}
            />
          </div>

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

          <Button type="submit" disabled={submitting} className="w-full">
            {submitting ? 'Signing in…' : 'Sign in'}
          </Button>
        </div>
      </form>
    </div>
  )
}