import type { FormEvent } from 'react'
import { useEffect, useState } from 'react'
import toast from 'react-hot-toast'

import { adminAPI } from '../api/admin'
import { strmAPI, type GenerateSTRMResult } from '../api/strm'
import type { Library } from '../types'
import {
  inferSTRMOutputRoot,
  playbackStatusText,
  preferredSTRMBaseURL,
  suggestedSTRMOutputDir,
  type CloudPlaybackMode,
} from './strmPageModel'
import { apiErrorMessage, isHTTPURL } from './strmPageUtils'

export function useStrmGenerateForm(libraries: Library[]) {
  const [generateLibraryID, setGenerateLibraryID] = useState('')
  const [baseURL, setBaseURL] = useState('')
  const [outputDir, setOutputDir] = useState('')
  const [outputRoot, setOutputRoot] = useState('')
  const [outputScope, setOutputScope] = useState('')
  const [outputDirTouched, setOutputDirTouched] = useState(false)
  const [settingsLoaded, setSettingsLoaded] = useState(false)
  const [cloudPlaybackMode, setCloudPlaybackMode] = useState<CloudPlaybackMode>('redirect_proxy')
  const [strmPlaybackEnabled, setStrmPlaybackEnabled] = useState(false)
  const [redirectProxyEnabled, setRedirectProxyEnabled] = useState(true)
  const [autoGenerate, setAutoGenerate] = useState(false)
  const [savingSettings, setSavingSettings] = useState(false)
  const [overwrite, setOverwrite] = useState(false)
  const [generating, setGenerating] = useState(false)
  const [generateResult, setGenerateResult] = useState<GenerateSTRMResult | null>(null)

  useEffect(() => {
    adminAPI
      .listSettings()
      .then((rows) => {
        const settings = Object.fromEntries(rows.map((row) => [row.key, row.value]))
        const savedOutputDir = settings['strm.output_dir'] || ''
        const mode = settings['cloud.playback_mode']
        const nextMode =
          mode === 'strm' || mode === 'redirect_proxy'
            ? mode
            : settings['strm.enabled'] === 'true'
              ? 'strm'
              : 'redirect_proxy'

        setBaseURL(preferredSTRMBaseURL(settings['strm.base_url'] || settings['app.server_url'] || ''))
        setOutputDir(savedOutputDir)
        setOutputRoot(savedOutputDir)
        setOutputScope(settings['strm.output_scope'] || '')
        setOutputDirTouched(false)
        setCloudPlaybackMode(nextMode)
        setStrmPlaybackEnabled(
          settings['cloud.playback_strm_enabled'] != null
            ? settings['cloud.playback_strm_enabled'] === 'true'
            : settings['strm.enabled'] === 'true' || nextMode === 'strm',
        )
        setRedirectProxyEnabled(settings['cloud.playback_redirect_proxy_enabled'] !== 'false')
        setAutoGenerate(settings['strm.auto_generate_enabled'] === 'true')
        setSettingsLoaded(true)
      })
      .catch(() => setSettingsLoaded(true))
  }, [])

  useEffect(() => {
    if (!generateLibraryID && libraries[0]) setGenerateLibraryID(libraries[0].id)
  }, [libraries, generateLibraryID])

  useEffect(() => {
    if (!settingsLoaded || outputDirTouched || !generateLibraryID) return
    const root = outputScope === 'library' ? inferSTRMOutputRoot(outputRoot, libraries) : outputRoot
    if (generateLibraryID === '*') {
      setOutputDir(root)
      return
    }
    const library = libraries.find((item) => item.id === generateLibraryID)
    if (library) setOutputDir(suggestedSTRMOutputDir(root, library))
  }, [settingsLoaded, outputDirTouched, outputRoot, outputScope, generateLibraryID, libraries])

  const onOutputDirChange = (value: string) => {
    setOutputDir(value)
    setOutputRoot(value)
    setOutputScope('')
    setOutputDirTouched(true)
  }

  const onGenerate = async (event: FormEvent) => {
    event.preventDefault()
    const trimmedBaseURL = baseURL.trim()
    if (!generateLibraryID || !trimmedBaseURL) return
    if (!isHTTPURL(trimmedBaseURL)) {
      toast.error('域名必须以 http:// 或 https:// 开头')
      return
    }

    setGenerating(true)
    try {
      const result = await strmAPI.generate({
        library_id: generateLibraryID,
        base_url: trimmedBaseURL.replace(/\/+$/, ''),
        output_dir: outputDir.trim(),
        overwrite,
        enabled: autoGenerate,
        include_local: true,
      })
      const nextOutputDir = result.output_dir || outputDir
      setGenerateResult(result)
      setOutputDir(nextOutputDir)
      setOutputRoot(inferSTRMOutputRoot(nextOutputDir, libraries))
      setOutputScope(generateLibraryID === '*' ? 'all' : 'library')
      setOutputDirTouched(false)
      toast.success(`生成完成：新增 ${result.generated} · 更新 ${result.updated} · 跳过 ${result.skipped}`)
    } catch (err: unknown) {
      toast.error(apiErrorMessage(err, '生成失败'))
    } finally {
      setGenerating(false)
    }
  }

  const saveSTRMSettings = async () => {
    setSavingSettings(true)
    try {
      const effectiveMode: CloudPlaybackMode =
        strmPlaybackEnabled && !redirectProxyEnabled
          ? 'strm'
          : !strmPlaybackEnabled && redirectProxyEnabled
            ? 'redirect_proxy'
            : cloudPlaybackMode
      await Promise.all([
        adminAPI.updateSetting('cloud.playback_mode', effectiveMode),
        adminAPI.updateSetting('cloud.playback_strm_enabled', String(strmPlaybackEnabled)),
        adminAPI.updateSetting('cloud.playback_redirect_proxy_enabled', String(redirectProxyEnabled)),
        adminAPI.updateSetting('strm.enabled', String(strmPlaybackEnabled)),
        adminAPI.updateSetting('strm.auto_generate_enabled', String(autoGenerate)),
      ])
      setCloudPlaybackMode(effectiveMode)
      toast.success(
        strmPlaybackEnabled || redirectProxyEnabled
          ? `播放设置已保存：优先 ${effectiveMode === 'strm' ? 'STRMURL' : '302/反代'}`
          : '播放设置已保存：云盘第三方播放已关闭',
      )
    } catch (err: unknown) {
      toast.error(apiErrorMessage(err, '保存 STRM 开关失败'))
    } finally {
      setSavingSettings(false)
    }
  }

  return {
    autoGenerate,
    baseURL,
    cloudPlaybackMode,
    generateLibraryID,
    generateResult,
    generating,
    onGenerate,
    outputDir,
    overwrite,
    playbackStatus: playbackStatusText(strmPlaybackEnabled, redirectProxyEnabled, cloudPlaybackMode),
    redirectProxyEnabled,
    saveSTRMSettings,
    savingSettings,
    setAutoGenerate,
    setBaseURL,
    setCloudPlaybackMode,
    setGenerateLibraryID,
    setOutputDir: onOutputDirChange,
    setOverwrite,
    setRedirectProxyEnabled,
    setStrmPlaybackEnabled,
    strmPlaybackEnabled,
  }
}