import { computed } from 'vue'
import { injectService, SERVICE_TOKENS } from '@/core/di-container'
import type { ScheduledEventService, ScheduledEvent, EventCompletion } from '../services/ScheduledEventService'
import { useToast } from '@/core/composables/useToast'

/**
 * Composable for managing scheduled events in the feed
 */
export function useScheduledEvents() {
  const scheduledEventService = injectService<ScheduledEventService>(SERVICE_TOKENS.SCHEDULED_EVENT_SERVICE)
  const toast = useToast()

  /**
   * Get all scheduled events
   */
  const getScheduledEvents = (): ScheduledEvent[] => {
    if (!scheduledEventService) return []
    return scheduledEventService.getScheduledEvents()
  }

  /**
   * Get events for a specific date (YYYY-MM-DD)
   */
  const getEventsForDate = (date: string): ScheduledEvent[] => {
    if (!scheduledEventService) return []
    return scheduledEventService.getEventsForDate(date)
  }

  /**
   * Get today's scheduled events
   */
  const getTodaysEvents = (): ScheduledEvent[] => {
    if (!scheduledEventService) return []
    return scheduledEventService.getTodaysEvents()
  }

  /**
   * Get completion status for an event
   */
  const getCompletion = (eventAddress: string): EventCompletion | undefined => {
    if (!scheduledEventService) return undefined
    return scheduledEventService.getCompletion(eventAddress)
  }

  /**
   * Check if an event is completed
   */
  const isCompleted = (eventAddress: string): boolean => {
    if (!scheduledEventService) return false
    return scheduledEventService.isCompleted(eventAddress)
  }

  /**
   * Toggle completion status of an event
   */
  const toggleComplete = async (event: ScheduledEvent, notes: string = ''): Promise<void> => {
    console.log('🔧 useScheduledEvents: toggleComplete called for event:', event.title)

    if (!scheduledEventService) {
      console.error('❌ useScheduledEvents: Scheduled event service not available')
      toast.error('Scheduled event service not available')
      return
    }

    try {
      const eventAddress = `31922:${event.pubkey}:${event.dTag}`
      const currentlyCompleted = scheduledEventService.isCompleted(eventAddress)
      console.log('📊 useScheduledEvents: Current completion status:', currentlyCompleted)

      if (currentlyCompleted) {
        console.log('⬇️ useScheduledEvents: Marking as incomplete...')
        await scheduledEventService.uncompleteEvent(event)
        toast.success('Event marked as incomplete')
      } else {
        console.log('⬆️ useScheduledEvents: Marking as complete...')
        await scheduledEventService.completeEvent(event, notes)
        toast.success('Event completed!')
      }
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Failed to toggle completion'

      if (message.includes('authenticated')) {
        toast.error('Please sign in to complete events')
      } else if (message.includes('Not connected')) {
        toast.error('Not connected to relays')
      } else {
        toast.error(message)
      }

      console.error('❌ useScheduledEvents: Failed to toggle completion:', error)
    }
  }

  /**
   * Complete an event with optional notes
   */
  const completeEvent = async (event: ScheduledEvent, notes: string = ''): Promise<void> => {
    if (!scheduledEventService) {
      toast.error('Scheduled event service not available')
      return
    }

    try {
      await scheduledEventService.completeEvent(event, notes)
      toast.success('Event completed!')
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Failed to complete event'
      toast.error(message)
      console.error('Failed to complete event:', error)
    }
  }

  /**
   * Get loading state
   */
  const isLoading = computed(() => {
    return scheduledEventService?.isLoading ?? false
  })

  /**
   * Get all scheduled events (reactive)
   */
  const allScheduledEvents = computed(() => {
    return scheduledEventService?.scheduledEvents ?? new Map()
  })

  /**
   * Get all completions (reactive)
   */
  const allCompletions = computed(() => {
    return scheduledEventService?.completions ?? new Map()
  })

  return {
    // Methods
    getScheduledEvents,
    getEventsForDate,
    getTodaysEvents,
    getCompletion,
    isCompleted,
    toggleComplete,
    completeEvent,

    // State
    isLoading,
    allScheduledEvents,
    allCompletions
  }
}