import { defineStore } from 'pinia'
import { ref } from 'vue'
import { useApi } from '../composables/useApi.js'
import { useAsyncAction } from '../composables/useAsyncAction.js'

export const useDownloadsStore = defineStore('downloads', () => {
  const api = useApi()

  const events = ref([])
  const cursor = ref(null)
  const hasMore = ref(true)
  const filter = ref({
    status: null, source_id: null, artist_id: null,
    from_date: null, to_date: null,
  })
  const selected = ref(null)
  const { loading, error, run } = useAsyncAction()
  const stats = ref({ pending: 0, running: 0, ok: 0, error: 0, skipped: 0 })
  const activity = ref({ hours: 24, buckets: [] })
  const failing = ref([])
  // Running + queued events, fetched independent of the feed's filter so
  // the "active now" panel always reflects what's happening regardless of
  // how the operator has filtered the historical list below.
  const activeEvents = ref([])

  function _params(extra = {}) {
    const out = { limit: 50, ...extra }
    if (filter.value.status) out.status = filter.value.status
    if (filter.value.source_id != null) out.source_id = filter.value.source_id
    if (filter.value.artist_id != null) out.artist_id = filter.value.artist_id
    return out
  }

  async function loadFirst() {
    await run(async () => {
      const body = await api.get('/api/downloads', { params: _params() })
      events.value = body
      cursor.value = body.length ? body[body.length - 1].id : null
      hasMore.value = body.length === 50
    })
  }

  async function loadMore() {
    if (!hasMore.value || cursor.value == null) return
    await run(async () => {
      const body = await api.get('/api/downloads', { params: _params({ before: cursor.value }) })
      events.value.push(...body)
      cursor.value = body.length ? body[body.length - 1].id : cursor.value
      hasMore.value = body.length === 50
    })
  }

  async function loadOne(id) {
    selected.value = await api.get(`/api/downloads/${id}`)
    return selected.value
  }

  async function applyFilter(patch) {
    filter.value = { ...filter.value, ...patch }
    await loadFirst()
  }

  function closeDetail() {
    selected.value = null
  }

  async function loadStats(windowHours = 24) {
    stats.value = await api.get('/api/downloads/stats', { params: { window_hours: windowHours } })
    return stats.value
  }

  async function loadActivity(hours = 24) {
    activity.value = await api.get('/api/downloads/activity', { params: { hours } })
    return activity.value
  }

  async function loadFailing() {
    failing.value = await api.get('/api/sources', { params: { failing: true } })
    return failing.value
  }

  async function loadActive() {
    const [running, pending] = await Promise.all([
      api.get('/api/downloads', { params: { status: 'running', limit: 50 } }),
      api.get('/api/downloads', { params: { status: 'pending', limit: 50 } }),
    ])
    activeEvents.value = [...running, ...pending]
    return activeEvents.value
  }

  // POSTs to the download-recovery sweep endpoint (fire-and-forget — the
  // Beat schedule also runs it every 5 min). The caller should refresh
  // failing/stats a few seconds after this resolves to see swept rows.
  async function recoverStalled() {
    return api.post('/api/downloads/recover-stalled')
  }

  return {
    events, cursor, hasMore, filter, selected, loading, error, stats,
    activity, failing, activeEvents,
    loadFirst, loadMore, loadOne, applyFilter, closeDetail, loadStats,
    loadActivity, loadFailing, loadActive, recoverStalled,
  }
})