/**
 * Custom hook for monitoring sync progress
 * Centralizes the pattern of polling syncProgressManager and updating state
 */

import { useState, useEffect, useRef, useCallback, type MutableRefObject } from 'react'
import type { SyncProgress } from '../helpers/syncProgressHelper'

export interface UseSyncProgressOptions {
  onComplete?: () => void | Promise<void>
  pollInterval?: number
  maxDuration?: number
}

export interface UseSyncProgressResult {
  syncProgress: SyncProgress | null
  isSyncing: boolean
  startMonitoring: () => void
  stopMonitoring: () => void
}

/**
 * Hook to monitor sync progress from syncProgressManager
 */
export function useSyncProgress(options: UseSyncProgressOptions = {}): UseSyncProgressResult {
  const config = normalizeSyncProgressOptions(options)
  const state = useSyncProgressState({ onComplete: config.onComplete })
  const checkProgress = useCheckProgress({ onCompleteRef: state.onCompleteRef, setSyncProgress: state.setSyncProgress, setIsSyncing: state.setIsSyncing, stopMonitoring: state.stopMonitoring })
  const startMonitoring = useStartMonitoring({ pollInterval: config.pollInterval, maxDuration: config.maxDuration, checkProgress, stopMonitoring: state.stopMonitoring, setIsSyncing: state.setIsSyncing, setSyncProgress: state.setSyncProgress, isMonitoringRef: state.isMonitoringRef, intervalRef: state.intervalRef, timeoutRef: state.timeoutRef })
  useUnmountCleanup({ stopMonitoring: state.stopMonitoring })
  return { syncProgress: state.syncProgress, isSyncing: state.isSyncing, startMonitoring, stopMonitoring: state.stopMonitoring }
}

function normalizeSyncProgressOptions(options: UseSyncProgressOptions): { onComplete: UseSyncProgressOptions['onComplete']; pollInterval: number; maxDuration: number } {
  return { onComplete: options.onComplete, pollInterval: options.pollInterval ?? 500, maxDuration: options.maxDuration ?? 60000 }
}

function useSyncProgressState(params: { onComplete: UseSyncProgressOptions['onComplete'] }): {
  syncProgress: SyncProgress | null
  setSyncProgress: (value: SyncProgress | null) => void
  isSyncing: boolean
  setIsSyncing: (value: boolean) => void
  intervalRef: MutableRefObject<ReturnType<typeof setInterval> | null>
  timeoutRef: MutableRefObject<ReturnType<typeof setTimeout> | null>
  isMonitoringRef: MutableRefObject<boolean>
  onCompleteRef: MutableRefObject<UseSyncProgressOptions['onComplete']>
  stopMonitoring: () => void
} {
  const [syncProgress, setSyncProgress] = useState<SyncProgress | null>(null)
  const [isSyncing, setIsSyncing] = useState(false)
  const intervalRef = useRef<ReturnType<typeof setInterval> | null>(null)
  const timeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null)
  const isMonitoringRef = useRef(false)
  const onCompleteRef = useRef(params.onComplete)

  useEffect(() => {
    onCompleteRef.current = params.onComplete
  }, [params.onComplete])

  const stopMonitoring = useCallback((): void => {
    if (!isMonitoringRef.current) {
      return
    }
    isMonitoringRef.current = false
    setIsSyncing(false)
    intervalRef.current = clearIntervalAndReturnNull(intervalRef.current)
    timeoutRef.current = clearTimeoutAndReturnNull(timeoutRef.current)
  }, [])

  return { syncProgress, setSyncProgress, isSyncing, setIsSyncing, intervalRef, timeoutRef, isMonitoringRef, onCompleteRef, stopMonitoring }
}

function clearIntervalAndReturnNull(current: ReturnType<typeof setInterval> | null): null {
  if (current) {
    clearInterval(current)
  }
  return null
}

function clearTimeoutAndReturnNull(current: ReturnType<typeof setTimeout> | null): null {
  if (current) {
    clearTimeout(current)
  }
  return null
}

function useCheckProgress(params: {
  onCompleteRef: MutableRefObject<UseSyncProgressOptions['onComplete']>
  setSyncProgress: (value: SyncProgress | null) => void
  setIsSyncing: (value: boolean) => void
  stopMonitoring: () => void
}): () => Promise<void> {
  const { onCompleteRef, setSyncProgress, setIsSyncing, stopMonitoring } = params
  return useCallback(async (): Promise<void> => {
    const { syncProgressManager } = await import('../syncProgressManager')
    const current = syncProgressManager.getProgress()
    if (!current) {
      return
    }
    setSyncProgress(current)
    if (!current.completed) {
      return
    }
    setIsSyncing(false)
    await onCompleteRef.current?.()
    stopMonitoring()
  }, [onCompleteRef, setIsSyncing, setSyncProgress, stopMonitoring])
}

function useStartMonitoring(params: {
  pollInterval: number
  maxDuration: number
  checkProgress: () => Promise<void>
  stopMonitoring: () => void
  setIsSyncing: (value: boolean) => void
  setSyncProgress: (value: SyncProgress | null) => void
  isMonitoringRef: MutableRefObject<boolean>
  intervalRef: MutableRefObject<ReturnType<typeof setInterval> | null>
  timeoutRef: MutableRefObject<ReturnType<typeof setTimeout> | null>
}): () => void {
  const {
    pollInterval,
    maxDuration,
    checkProgress,
    stopMonitoring,
    setIsSyncing,
    setSyncProgress,
    isMonitoringRef,
    intervalRef,
    timeoutRef,
  } = params
  return useCallback((): void => {
    if (isMonitoringRef.current) {
      return
    }
    isMonitoringRef.current = true
    setIsSyncing(true)
    setSyncProgress({ currentStep: 0, totalSteps: 7, completed: false })
    intervalRef.current = setInterval(() => void checkProgress(), pollInterval)
    timeoutRef.current = setTimeout(() => stopMonitoring(), maxDuration)
  }, [checkProgress, intervalRef, isMonitoringRef, maxDuration, pollInterval, setIsSyncing, setSyncProgress, stopMonitoring, timeoutRef])
}

function useUnmountCleanup(params: { stopMonitoring: () => void }): void {
  const { stopMonitoring } = params
  useEffect(() => () => stopMonitoring(), [stopMonitoring])
}