/**
 * Hook for LSP plugin recommendations
 *
 * Detects file edits and recommends LSP plugins when:
 * - File extension matches an LSP plugin
 * - LSP binary is already installed on the system
 * - Plugin is not already installed
 * - User hasn't disabled recommendations
 *
 * Only shows one recommendation per session.
 */

import { extname, join } from 'path'
import * as React from 'react'
import {
  hasShownLspRecommendationThisSession,
  setLspRecommendationShownThisSession,
} from '../bootstrap/state.js'
import { useNotifications } from '../context/notifications.js'
import { useAppState } from '../state/AppState.js'
import { saveGlobalConfig } from '../utils/config.js'
import { logForDebugging } from '../utils/debug.js'
import { logError } from '../utils/log.js'
import {
  addToNeverSuggest,
  getMatchingLspPlugins,
  incrementIgnoredCount,
} from '../utils/plugins/lspRecommendation.js'
import { cacheAndRegisterPlugin } from '../utils/plugins/pluginInstallationHelpers.js'
import {
  getSettingsForSource,
  updateSettingsForSource,
} from '../utils/settings/settings.js'
import {
  installPluginAndNotify,
  usePluginRecommendationBase,
} from './usePluginRecommendationBase.js'

// Threshold for detecting timeout vs explicit dismiss (ms)
// Menu auto-dismisses at 30s, so anything over 28s is likely timeout
const TIMEOUT_THRESHOLD_MS = 28_000

export type LspRecommendationState = {
  pluginId: string
  pluginName: string
  pluginDescription?: string
  fileExtension: string
  shownAt: number // Timestamp for timeout detection
} | null

type UseLspPluginRecommendationResult = {
  recommendation: LspRecommendationState
  handleResponse: (response: 'yes' | 'no' | 'never' | 'disable') => void
}

export function useLspPluginRecommendation(): UseLspPluginRecommendationResult {
  const trackedFiles = useAppState(s => s.fileHistory.trackedFiles)
  const { addNotification } = useNotifications()
  const checkedFilesRef = React.useRef<Set<string>>(new Set())
  const { recommendation, clearRecommendation, tryResolve } =
    usePluginRecommendationBase<NonNullable<LspRecommendationState>>()

  React.useEffect(() => {
    tryResolve(async () => {
      if (hasShownLspRecommendationThisSession()) return null

      const newFiles: string[] = []
      for (const file of trackedFiles) {
        if (!checkedFilesRef.current.has(file)) {
          checkedFilesRef.current.add(file)
          newFiles.push(file)
        }
      }

      for (const filePath of newFiles) {
        try {
          const matches = await getMatchingLspPlugins(filePath)
          const match = matches[0] // official plugins prioritized
          if (match) {
            logForDebugging(
              `[useLspPluginRecommendation] Found match: ${match.pluginName} for ${filePath}`,
            )
            setLspRecommendationShownThisSession(true)
            return {
              pluginId: match.pluginId,
              pluginName: match.pluginName,
              pluginDescription: match.description,
              fileExtension: extname(filePath),
              shownAt: Date.now(),
            }
          }
        } catch (error) {
          logError(error)
        }
      }
      return null
    })
  }, [trackedFiles, tryResolve])

  const handleResponse = React.useCallback(
    (response: 'yes' | 'no' | 'never' | 'disable') => {
      if (!recommendation) return

      const { pluginId, pluginName, shownAt } = recommendation

      logForDebugging(
        `[useLspPluginRecommendation] User response: ${response} for ${pluginName}`,
      )

      switch (response) {
        case 'yes':
          void installPluginAndNotify(
            pluginId,
            pluginName,
            'lsp-plugin',
            addNotification,
            async pluginData => {
              logForDebugging(
                `[useLspPluginRecommendation] Installing plugin: ${pluginId}`,
              )
              const localSourcePath =
                typeof pluginData.entry.source === 'string'
                  ? join(
                      pluginData.marketplaceInstallLocation,
                      pluginData.entry.source,
                    )
                  : undefined
              await cacheAndRegisterPlugin(
                pluginId,
                pluginData.entry,
                'user',
                undefined, // projectPath - not needed for user scope
                localSourcePath,
              )
              // Enable in user settings so it loads on restart
              const settings = getSettingsForSource('userSettings')
              updateSettingsForSource('userSettings', {
                enabledPlugins: {
                  ...settings?.enabledPlugins,
                  [pluginId]: true,
                },
              })
              logForDebugging(
                `[useLspPluginRecommendation] Plugin installed: ${pluginId}`,
              )
            },
          )
          break

        case 'no': {
          const elapsed = Date.now() - shownAt
          if (elapsed >= TIMEOUT_THRESHOLD_MS) {
            logForDebugging(
              `[useLspPluginRecommendation] Timeout detected (${elapsed}ms), incrementing ignored count`,
            )
            incrementIgnoredCount()
          }
          break
        }

        case 'never':
          addToNeverSuggest(pluginId)
          break

        case 'disable':
          saveGlobalConfig(current => {
            if (current.lspRecommendationDisabled) return current
            return { ...current, lspRecommendationDisabled: true }
          })
          break
      }

      clearRecommendation()
    },
    [recommendation, addNotification, clearRecommendation],
  )

  return { recommendation, handleResponse }
}