/**
 * Schedule Composable
 *
 * Manages SBA schedule data fetching and week navigation.
 * Fetches current season/week and scheduled games from SBA API.
 */

import type { SbaCurrent, SbaScheduledGame } from '~/types'

export function useSchedule() {
  const config = useRuntimeConfig()
  const apiUrl = useApiUrl()

  // State - use useState for SSR-safe persistence across hydration
  // Regular ref() creates new state on each call, breaking after hydration
  const current = useState<SbaCurrent | null>('schedule-current', () => null)
  const selectedSeason = useState<number>('schedule-season', () => 0)
  const selectedWeek = useState<number>('schedule-week', () => 0)
  const games = useState<SbaScheduledGame[]>('schedule-games', () => [])
  const loading = useState<boolean>('schedule-loading', () => false)
  const error = useState<string | null>('schedule-error', () => null)

  // Track if we've initialized
  const initialized = useState<boolean>('schedule-initialized', () => false)

  /**
   * Get headers for SSR-compatible requests
   */
  function getHeaders(): Record<string, string> {
    const headers: Record<string, string> = {}
    if (import.meta.server) {
      const event = useRequestEvent()
      const cookieHeader = event?.node.req.headers.cookie
      if (cookieHeader) {
        headers['Cookie'] = cookieHeader
      }
    }
    return headers
  }

  /**
   * Fetch current season and week from SBA API
   */
  async function fetchCurrent(): Promise<void> {
    try {
      error.value = null
      const response = await $fetch<SbaCurrent>(`${apiUrl}/api/schedule/current`, {
        credentials: 'include',
        headers: getHeaders(),
      })

      current.value = response
      // Initialize selected to current if not already set
      if (!initialized.value) {
        selectedSeason.value = response.season
        selectedWeek.value = response.week
        initialized.value = true
      }

      console.log('[useSchedule] Current:', response)
    } catch (err: any) {
      console.error('[useSchedule] Failed to fetch current:', err)
      error.value = err.data?.detail || err.message || 'Failed to fetch current season/week'
      throw err
    }
  }

  /**
   * Fetch games for the selected week
   */
  async function fetchGames(): Promise<void> {
    if (!selectedSeason.value || !selectedWeek.value) {
      console.warn('[useSchedule] No season/week selected')
      return
    }

    try {
      loading.value = true
      error.value = null

      const response = await $fetch<SbaScheduledGame[]>(
        `${apiUrl}/api/schedule/games`,
        {
          credentials: 'include',
          headers: getHeaders(),
          params: {
            season: selectedSeason.value,
            week: selectedWeek.value,
          },
        }
      )

      games.value = response
      console.log(`[useSchedule] Loaded ${response.length} games for S${selectedSeason.value} W${selectedWeek.value}`)
    } catch (err: any) {
      console.error('[useSchedule] Failed to fetch games:', err)
      error.value = err.data?.detail || err.message || 'Failed to fetch schedule games'
      games.value = []
    } finally {
      loading.value = false
    }
  }

  /**
   * Initialize schedule data (fetch current + games)
   */
  async function initialize(): Promise<void> {
    try {
      loading.value = true
      await fetchCurrent()
      await fetchGames()
    } catch {
      // Error already set in fetchCurrent
    } finally {
      loading.value = false
    }
  }

  /**
   * Navigate to next week
   */
  function nextWeek(): void {
    selectedWeek.value++
    fetchGames()
  }

  /**
   * Navigate to previous week
   */
  function prevWeek(): void {
    if (selectedWeek.value > 1) {
      selectedWeek.value--
      fetchGames()
    }
  }

  /**
   * Jump back to current week
   */
  function goToCurrentWeek(): void {
    if (current.value) {
      selectedSeason.value = current.value.season
      selectedWeek.value = current.value.week
      fetchGames()
    }
  }

  /**
   * Set specific week (useful for direct navigation)
   */
  function setWeek(week: number): void {
    if (week >= 1) {
      selectedWeek.value = week
      fetchGames()
    }
  }

  /**
   * Check if currently viewing the current week
   */
  const isCurrentWeek = computed(() => {
    if (!current.value) return false
    return (
      selectedSeason.value === current.value.season &&
      selectedWeek.value === current.value.week
    )
  })

  return {
    // State - return refs directly for proper reactivity in templates
    current,
    selectedSeason,
    selectedWeek,
    games,
    loading,
    error,
    initialized,

    // Computed
    isCurrentWeek,

    // Actions
    initialize,
    fetchCurrent,
    fetchGames,
    nextWeek,
    prevWeek,
    goToCurrentWeek,
    setWeek,
  }
}