import { useState, useEffect } from 'react'
import { nostrAuthService } from '@/lib/nostrAuth'
import { syncUserContentToCache, type SyncProgress } from '@/lib/userContentSync'
import { getLastSyncDate, setLastSyncDate as setLastSyncDateStorage, getCurrentTimestamp, calculateDaysBetween } from '@/lib/syncStorage'
import { MIN_EVENT_DATE } from '@/lib/platformConfig'
import { objectCache } from '@/lib/objectCache'
import { t } from '@/lib/i18n'

export function SyncProgressBar(): React.ReactElement | null {
  console.log('[SyncProgressBar] Component function called')

  const [syncProgress, setSyncProgress] = useState<SyncProgress | null>(null)
  const [isSyncing, setIsSyncing] = useState(false)
  const [lastSyncDate, setLastSyncDate] = useState<number | null>(null)
  const [totalDays, setTotalDays] = useState<number>(0)
  const [isInitialized, setIsInitialized] = useState(false)
  const [connectionState, setConnectionState] = useState<{ connected: boolean; pubkey: string | null }>({ connected: false, pubkey: null })
  const [error, setError] = useState<string | null>(null)

  async function loadSyncStatus(): Promise<void> {
    try {
      const state = nostrAuthService.getState()
      if (!state.connected || !state.pubkey) {
        return
      }

      const storedLastSyncDate = await getLastSyncDate()
      const currentTimestamp = getCurrentTimestamp()
      const days = calculateDaysBetween(storedLastSyncDate, currentTimestamp)

      setLastSyncDate(storedLastSyncDate)
      setTotalDays(days)
    } catch (loadError) {
      console.error('Error loading sync status:', loadError)
    }
  }

  useEffect(() => {
    // Check connection state
    const checkConnection = (): void => {
      const state = nostrAuthService.getState()
      console.log('[SyncProgressBar] Initial connection check:', { connected: state.connected, pubkey: state.pubkey })
      setConnectionState({ connected: state.connected ?? false, pubkey: state.pubkey ?? null })
      setIsInitialized(true)
    }

    // Initial check
    checkConnection()

    // Listen to connection changes
    const unsubscribe = nostrAuthService.subscribe((state) => {
      console.log('[SyncProgressBar] Connection state changed:', { connected: state.connected, pubkey: state.pubkey })
      setConnectionState({ connected: state.connected ?? false, pubkey: state.pubkey ?? null })
    })

    return () => {
      unsubscribe()
    }
  }, [])

  useEffect(() => {
    console.log('[SyncProgressBar] Effect triggered:', { isInitialized, connected: connectionState.connected, pubkey: connectionState.pubkey, isSyncing })

    if (!isInitialized) {
      console.log('[SyncProgressBar] Not initialized yet')
      return
    }

    if (!connectionState.connected) {
      console.log('[SyncProgressBar] Not connected')
      return
    }

    if (!connectionState.pubkey) {
      console.log('[SyncProgressBar] No pubkey')
      return
    }

    void (async () => {
      console.log('[SyncProgressBar] Starting sync check...')
      await loadSyncStatus()

      // Auto-start sync if not recently synced
      const storedLastSyncDate = await getLastSyncDate()
      const currentTimestamp = getCurrentTimestamp()
      const isRecentlySynced = storedLastSyncDate >= currentTimestamp - 3600

      console.log('[SyncProgressBar] Sync status:', { storedLastSyncDate, currentTimestamp, isRecentlySynced, isSyncing })

      // Only auto-start if not recently synced
      if (!isRecentlySynced && !isSyncing && connectionState.pubkey) {
        console.log('[SyncProgressBar] Starting auto-sync...')
        setIsSyncing(true)
        setSyncProgress({ currentStep: 0, totalSteps: 6, completed: false })

        try {
          await syncUserContentToCache(connectionState.pubkey, (progress) => {
            setSyncProgress(progress)
            if (progress.completed) {
              setIsSyncing(false)
              void loadSyncStatus()
            }
          })
          // Check if sync completed successfully (if it didn't, isSyncing should still be false)
          setIsSyncing(false)
        } catch (autoSyncError) {
          console.error('[SyncProgressBar] Error during auto-sync:', autoSyncError)
          setIsSyncing(false)
          setError(autoSyncError instanceof Error ? autoSyncError.message : 'Erreur de synchronisation')
        }
      } else {
        console.log('[SyncProgressBar] Skipping auto-sync:', { isRecentlySynced, isSyncing, hasPubkey: Boolean(connectionState.pubkey) })
      }
    })()
  }, [isInitialized, connectionState.connected, connectionState.pubkey, isSyncing])

  async function resynchronize(): Promise<void> {
    try {
      const state = nostrAuthService.getState()
      if (!state.connected || !state.pubkey) {
        return
      }

      setIsSyncing(true)
      setSyncProgress({ currentStep: 0, totalSteps: 6, completed: false })

      // Clear cache for user content (but keep other data)
      await Promise.all([
        objectCache.clear('author'),
        objectCache.clear('series'),
        objectCache.clear('publication'),
        objectCache.clear('review'),
        objectCache.clear('purchase'),
        objectCache.clear('sponsoring'),
        objectCache.clear('review_tip'),
      ])

      // Reset last sync date to force full resync
      await setLastSyncDateStorage(MIN_EVENT_DATE)

      // Reload sync status
      await loadSyncStatus()

      // Start full resynchronization
      if (state.pubkey !== null) {
        await syncUserContentToCache(state.pubkey, (progress) => {
          setSyncProgress(progress)
          if (progress.completed) {
            setIsSyncing(false)
            void loadSyncStatus()
          }
        })
      }
    } catch (resyncError) {
      console.error('Error resynchronizing:', resyncError)
      setIsSyncing(false)
    }
  }

  // Don't show if not initialized or not connected
  if (!isInitialized || !connectionState.connected || !connectionState.pubkey) {
    console.log('[SyncProgressBar] Not rendering:', { isInitialized, connected: connectionState.connected, pubkey: connectionState.pubkey })
    return null
  }

  console.log('[SyncProgressBar] Rendering component')

  // Check if sync is recently completed (within last hour)
  const isRecentlySynced = lastSyncDate !== null && lastSyncDate >= getCurrentTimestamp() - 3600

  const progressPercentage = syncProgress && syncProgress.totalSteps > 0
    ? Math.min(100, (syncProgress.currentStep / syncProgress.totalSteps) * 100)
    : 0

  const formatDate = (timestamp: number): string => {
    const date = new Date(timestamp * 1000)
    const locale = typeof window !== 'undefined' ? navigator.language : 'fr-FR'
    return date.toLocaleDateString(locale, { day: '2-digit', month: '2-digit', year: 'numeric' })
  }

  const getStartDate = (): number => {
    if (lastSyncDate !== null) {
      return lastSyncDate
    }
    return MIN_EVENT_DATE
  }

  const startDate = getStartDate()
  const endDate = getCurrentTimestamp()

  return (
    <div className="bg-cyber-darker border border-neon-cyan/30 rounded-lg p-4 mt-6">
      {error && (
        <div className="mb-4 bg-red-900/30 border border-red-500/50 rounded p-3 text-red-300 text-sm">
          {error}
          <button
            onClick={() => {
              setError(null)
            }}
            className="ml-2 text-red-400 hover:text-red-200"
          >
            ×
          </button>
        </div>
      )}
      <div className="flex items-center justify-between mb-2">
        <h3 className="text-lg font-semibold text-neon-cyan">
          {t('settings.sync.title')}
        </h3>
        {!isSyncing && (
          <button
            onClick={() => {
              void resynchronize()
            }}
            className="px-3 py-1 text-xs bg-neon-cyan/20 hover:bg-neon-cyan/30 text-neon-cyan rounded border border-neon-cyan/50 hover:border-neon-cyan transition-colors"
          >
            {t('settings.sync.resync')}
          </button>
        )}
      </div>

      {totalDays > 0 && (
        <div className="mb-2">
          <p className="text-sm text-cyber-accent">
            {t('settings.sync.daysRange', {
              startDate: formatDate(startDate),
              endDate: formatDate(endDate),
              days: totalDays,
            })}
          </p>
        </div>
      )}

      {isSyncing && syncProgress && (
        <div className="space-y-2">
          <div className="flex items-center justify-between text-sm">
            <span className="text-cyber-accent">
              {t('settings.sync.progress', {
                current: syncProgress.currentStep,
                total: syncProgress.totalSteps,
              })}
            </span>
            <span className="text-neon-cyan font-semibold">
              {Math.round(progressPercentage)}%
            </span>
          </div>
          <div className="w-full bg-cyber-dark rounded-full h-2 overflow-hidden">
            <div
              className="bg-neon-cyan h-full transition-all duration-300"
              style={{ width: `${progressPercentage}%` }}
            />
          </div>
        </div>
      )}

      {!isSyncing && totalDays === 0 && isRecentlySynced && (
        <p className="text-sm text-green-400">
          {t('settings.sync.completed')}
        </p>
      )}

      {!isSyncing && totalDays === 0 && !isRecentlySynced && (
        <p className="text-sm text-cyber-accent">
          {t('settings.sync.ready')}
        </p>
      )}
    </div>
  )
}