import * as React from 'react'
import { useEffect, useRef, useState } from 'react'
import {
  type AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
  logEvent,
} from 'src/services/analytics/index.js'
import { useInterval } from 'usehooks-ts'
import { useUpdateNotification } from '../hooks/useUpdateNotification.js'
import { Box, Text } from '@anthropic/ink'
import {
  type AutoUpdaterResult,
  getLatestVersion,
  getMaxVersion,
  type InstallStatus,
  installGlobalPackage,
  shouldSkipVersion,
} from '../utils/autoUpdater.js'
import { getGlobalConfig, isAutoUpdaterDisabled } from '../utils/config.js'
import { logForDebugging } from '../utils/debug.js'
import { getCurrentInstallationType } from '../utils/doctorDiagnostic.js'
import {
  installOrUpdateClaudePackage,
  localInstallationExists,
} from '../utils/localInstaller.js'
import { removeInstalledSymlink } from '../utils/nativeInstaller/index.js'
import { gt, gte } from '../utils/semver.js'
import { getInitialSettings } from '../utils/settings/settings.js'

type Props = {
  isUpdating: boolean
  onChangeIsUpdating: (isUpdating: boolean) => void
  onAutoUpdaterResult: (autoUpdaterResult: AutoUpdaterResult) => void
  autoUpdaterResult: AutoUpdaterResult | null
  showSuccessMessage: boolean
  verbose: boolean
}

export function AutoUpdater({
  isUpdating,
  onChangeIsUpdating,
  onAutoUpdaterResult,
  autoUpdaterResult,
  showSuccessMessage,
  verbose,
}: Props): React.ReactNode {
  const [versions, setVersions] = useState<{
    global?: string | null
    latest?: string | null
  }>({})
  const [hasLocalInstall, setHasLocalInstall] = useState(false)
  const updateSemver = useUpdateNotification(autoUpdaterResult?.version)

  useEffect(() => {
    void localInstallationExists().then(setHasLocalInstall)
  }, [])

  // Track latest isUpdating value in a ref so the memoized checkForUpdates
  // callback always sees the current value. Without this, the 30-minute
  // interval fires with a stale closure where isUpdating is false, allowing
  // a concurrent installGlobalPackage() to run while one is already in
  // progress.
  const isUpdatingRef = useRef(isUpdating)
  isUpdatingRef.current = isUpdating

  const checkForUpdates = React.useCallback(async () => {
    if (isUpdatingRef.current) {
      return
    }

    if (
      process.env.NODE_ENV === 'test' ||
      process.env.NODE_ENV === 'development'
    ) {
      logForDebugging(
        'AutoUpdater: Skipping update check in test/dev environment',
      )
      return
    }

    const currentVersion = MACRO.VERSION
    const channel = getInitialSettings()?.autoUpdatesChannel ?? 'latest'
    let latestVersion = await getLatestVersion(channel)
    const isDisabled = isAutoUpdaterDisabled()

    // Check if max version is set (server-side kill switch for auto-updates)
    const maxVersion = await getMaxVersion()
    if (maxVersion && latestVersion && gt(latestVersion, maxVersion)) {
      logForDebugging(
        `AutoUpdater: maxVersion ${maxVersion} is set, capping update from ${latestVersion} to ${maxVersion}`,
      )
      if (gte(currentVersion, maxVersion)) {
        logForDebugging(
          `AutoUpdater: current version ${currentVersion} is already at or above maxVersion ${maxVersion}, skipping update`,
        )
        setVersions({ global: currentVersion, latest: latestVersion })
        return
      }
      latestVersion = maxVersion
    }

    setVersions({ global: currentVersion, latest: latestVersion })

    // Check if update needed and perform update
    if (
      !isDisabled &&
      currentVersion &&
      latestVersion &&
      !gte(currentVersion, latestVersion) &&
      !shouldSkipVersion(latestVersion)
    ) {
      const startTime = Date.now()
      onChangeIsUpdating(true)

      // Remove native installer symlink since we're using JS-based updates
      // But only if user hasn't migrated to native installation
      const config = getGlobalConfig()
      if (config.installMethod !== 'native') {
        await removeInstalledSymlink()
      }

      // Detect actual running installation type
      const installationType = await getCurrentInstallationType()
      logForDebugging(
        `AutoUpdater: Detected installation type: ${installationType}`,
      )

      // Skip update for development builds
      if (installationType === 'development') {
        logForDebugging('AutoUpdater: Cannot auto-update development build')
        onChangeIsUpdating(false)
        return
      }

      // Choose the appropriate update method based on what's actually running
      let installStatus: InstallStatus
      let updateMethod: 'local' | 'global'

      if (installationType === 'npm-local') {
        // Use local update for local installations
        logForDebugging('AutoUpdater: Using local update method')
        updateMethod = 'local'
        installStatus = await installOrUpdateClaudePackage(channel)
      } else if (installationType === 'npm-global') {
        // Use global update for global installations
        logForDebugging('AutoUpdater: Using global update method')
        updateMethod = 'global'
        installStatus = await installGlobalPackage()
      } else if (installationType === 'native') {
        // This shouldn't happen - native should use NativeAutoUpdater
        logForDebugging(
          'AutoUpdater: Unexpected native installation in non-native updater',
        )
        onChangeIsUpdating(false)
        return
      } else {
        // Fallback to config-based detection for unknown types
        logForDebugging(
          `AutoUpdater: Unknown installation type, falling back to config`,
        )
        const isMigrated = config.installMethod === 'local'
        updateMethod = isMigrated ? 'local' : 'global'

        if (isMigrated) {
          installStatus = await installOrUpdateClaudePackage(channel)
        } else {
          installStatus = await installGlobalPackage()
        }
      }

      onChangeIsUpdating(false)

      if (installStatus === 'success') {
        logEvent('tengu_auto_updater_success', {
          fromVersion:
            currentVersion as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
          toVersion:
            latestVersion as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
          durationMs: Date.now() - startTime,
          wasMigrated: updateMethod === 'local',
          installationType:
            installationType as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
        })
      } else {
        logEvent('tengu_auto_updater_fail', {
          fromVersion:
            currentVersion as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
          attemptedVersion:
            latestVersion as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
          status:
            installStatus as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
          durationMs: Date.now() - startTime,
          wasMigrated: updateMethod === 'local',
          installationType:
            installationType as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
        })
      }

      onAutoUpdaterResult({
        version: latestVersion,
        status: installStatus,
      })
    }
    // isUpdating intentionally omitted from deps; we read isUpdatingRef
    // instead so the guard is always current without changing callback
    // identity (which would re-trigger the initial-check useEffect below).
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [onAutoUpdaterResult])

  // Initial check
  useEffect(() => {
    void checkForUpdates()
  }, [checkForUpdates])

  // Check every 30 minutes
  useInterval(checkForUpdates, 30 * 60 * 1000)

  if (!autoUpdaterResult?.version && (!versions.global || !versions.latest)) {
    return null
  }

  if (!autoUpdaterResult?.version && !isUpdating) {
    return null
  }

  return (
    <Box flexDirection="row" gap={1}>
      {verbose && (
        <Text dimColor wrap="truncate">
          globalVersion: {versions.global} &middot; latestVersion:{' '}
          {versions.latest}
        </Text>
      )}
      {isUpdating ? (
        <>
          <Box>
            <Text color="text" dimColor wrap="truncate">
              Auto-updating…
            </Text>
          </Box>
        </>
      ) : (
        autoUpdaterResult?.status === 'success' &&
        showSuccessMessage &&
        updateSemver && (
          <Text color="success" wrap="truncate">
            ✓ Update installed · Restart to apply
          </Text>
        )
      )}
      {(autoUpdaterResult?.status === 'install_failed' ||
        autoUpdaterResult?.status === 'no_permissions') && (
        <Text color="error" wrap="truncate">
          ✗ Auto-update failed &middot; Try <Text bold>claude doctor</Text> or{' '}
          <Text bold>
            {hasLocalInstall
              ? `cd ~/.claude/local && npm update ${MACRO.PACKAGE_URL}`
              : `npm i -g ${MACRO.PACKAGE_URL}`}
          </Text>
        </Text>
      )}
    </Box>
  )
}