'use client'

import { useState, FormEvent } from 'react'
import { useTranslations } from 'next-intl'
import { useRouter } from '@/navigation'

const FORMATS = ['mp4', 'mp3', 'webm', 'mkv']
const QUALITIES = ['best', '1080p', '720p', '480p', '360p']

function Spinner() {
  return (
    <svg className="animate-spin w-4 h-4" viewBox="0 0 24 24" fill="none" aria-hidden>
      <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
      <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
    </svg>
  )
}

const selectClass =
  'rounded-lg border border-gray-200 dark:border-slate-700 bg-white dark:bg-slate-900 px-2 py-1 text-gray-900 dark:text-gray-50 text-sm outline-none focus:ring-2 focus:ring-violet-500'

export function SubmitForm({ examplePlaceholder }: { examplePlaceholder?: string } = {}) {
  const t = useTranslations('home')
  const router = useRouter()
  const [url, setUrl] = useState('')
  const [format, setFormat] = useState('mp4')
  const [quality, setQuality] = useState('best')
  const [subtitles, setSubtitles] = useState(false)
  const [extraArgs, setExtraArgs] = useState('')
  const [error, setError] = useState<string | null>(null)
  const [loading, setLoading] = useState(false)

  async function handleSubmit(e: FormEvent) {
    e.preventDefault()
    setError(null)
    setLoading(true)

    const res = await fetch('/api/downloads', {
      method: 'POST',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify({
        url,
        format,
        quality,
        subtitles,
        extraArgs: extraArgs.trim() || null,
      }),
    })

    setLoading(false)

    if (res.status === 429) {
      setError(t('errorRateLimit'))
      return
    }
    if (!res.ok) {
      const body = await res.json().catch(() => ({}))
      setError((body as { error?: string }).error ?? t('errorGeneric'))
      return
    }

    const { uuid } = (await res.json()) as { uuid: string }
    router.push(`/status/${uuid}`)
  }

  return (
    <form onSubmit={handleSubmit} className="w-full max-w-2xl mx-auto">
      {/* URL input with inline submit button */}
      <div className="relative">
        {/* Violet glow behind the input */}
        <div className="absolute inset-0 -z-10 rounded-xl bg-violet-500 blur-3xl opacity-15 dark:opacity-20" aria-hidden />
        <div className="flex rounded-xl border border-gray-200 dark:border-slate-700 bg-white dark:bg-slate-900 overflow-hidden shadow-sm focus-within:ring-2 focus-within:ring-violet-500">
          <input
            type="url"
            value={url}
            onChange={(e) => setUrl(e.target.value)}
            required
            placeholder={examplePlaceholder ?? 'https://www.youtube.com/watch?v=...'}
            className="flex-1 px-4 py-3 bg-transparent text-sm outline-none placeholder:text-gray-400 dark:placeholder:text-slate-500"
          />
          <button
            type="submit"
            disabled={loading}
            className="flex items-center gap-2 px-5 py-3 bg-violet-600 hover:bg-violet-700 dark:bg-violet-500 dark:hover:bg-violet-600 text-white text-sm font-medium transition-colors disabled:opacity-60 cursor-pointer disabled:cursor-not-allowed"
          >
            {loading && <Spinner />}
            {loading ? t('submitting') : t('submit')}
          </button>
        </div>
      </div>

      {/* Options row */}
      <div className="mt-4 flex flex-wrap items-center gap-x-5 gap-y-3 text-sm text-gray-600 dark:text-gray-400">
        <label className="flex items-center gap-2">
          <span>{t('format')}</span>
          <select
            value={format}
            onChange={(e) => setFormat(e.target.value)}
            className={selectClass}
          >
            {FORMATS.map((f) => <option key={f}>{f}</option>)}
          </select>
        </label>

        <label className="flex items-center gap-2">
          <span>{t('quality')}</span>
          <select
            value={quality}
            onChange={(e) => setQuality(e.target.value)}
            className={selectClass}
          >
            {QUALITIES.map((q) => <option key={q}>{q}</option>)}
          </select>
        </label>

        <label className="flex items-center gap-2 cursor-pointer">
          <input
            type="checkbox"
            checked={subtitles}
            onChange={(e) => setSubtitles(e.target.checked)}
            className="accent-violet-600 w-4 h-4"
          />
          <span>{t('subtitles')}</span>
        </label>

        <details className="w-full mt-1">
          <summary className="cursor-pointer select-none text-gray-500 dark:text-gray-500 hover:text-gray-700 dark:hover:text-gray-300 transition-colors">
            {t('advanced')}
          </summary>
          <input
            type="text"
            value={extraArgs}
            onChange={(e) => setExtraArgs(e.target.value)}
            placeholder='["--sponsorblock-remove","all"]'
            className="mt-2 w-full rounded-lg border border-gray-200 dark:border-slate-700 bg-white dark:bg-slate-900 px-3 py-2 text-sm text-gray-900 dark:text-gray-50 outline-none focus:ring-2 focus:ring-violet-500"
          />
        </details>
      </div>

      {error && (
        <p className="mt-3 text-sm text-red-600 dark:text-red-400">{error}</p>
      )}
    </form>
  )
}