import { ref } from 'vue'
import { loading } from '@/utils'
import { getLastPrices, startLastPricePolling, stopLastPricePolling } from '@/utils/price'
import { useWalletAssets } from '@/composables/useWalletAssets'
import { clearProductsCatalog } from '@/composables/useProductsCatalog'
import { getHomeLayoutId } from '../layouts/registry'
import { fetchHomeChartPrices, loadHomeMaftolOffset, resetHomePriceChart } from './usePriceChart'
import { loadHomeBanners, resetHomeBanners } from './useBanners'
import { loadHomeFunds, resetHomeFunds } from './useUserFunds'

/**
 * Single entry point for all homepage API calls.
 * Mobile and desktop layouts must not fetch independently — they consume shared module state.
 */
let initPromise: Promise<void> | null = null
const initialized = ref(false)

export function isHomePageDataInitialized() {
  return initialized.value
}

export async function initHomePageData(force = false) {
  if (!force && initialized.value) {
    // Resume live price updates when returning to home without refetching datasets
    startLastPricePolling()
    return
  }

  if (!force && initPromise) {
    return initPromise
  }

  initPromise = (async () => {
    try {
      loading.value = true
      const { loadWalletAssets } = useWalletAssets()

      await Promise.all([
        loadHomeFunds(force),
        loadWalletAssets(force),
        getLastPrices(),
        fetchHomeChartPrices(force),
        startLastPricePolling(),
        loadHomeBanners(force),
      ])

      if (getHomeLayoutId() === 'boursecu') {
        await loadHomeMaftolOffset(force)
      }

      initialized.value = true
    } catch (error) {
      console.error('Home page initialization error:', error)
    } finally {
      loading.value = false
      initPromise = null
    }
  })()

  return initPromise
}

/** Clears homepage caches — call on logout or when a full refresh is required. */
export function resetHomePageData() {
  initialized.value = false
  initPromise = null
  stopLastPricePolling()
  resetHomeBanners()
  resetHomeFunds()
  resetHomePriceChart()
  clearProductsCatalog()
}

export function useHomePageInitState() {
  return { initialized }
}