import { defineStore } from 'pinia'
import { ref } from 'vue'
import { useApi } from '../composables/useApi.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 = ref(false)
  const error = ref(null)
  const stats = ref({ pending: 0, running: 0, ok: 0, error: 0, skipped: 0 })
  const activity = ref({ hours: 24, buckets: [] })
  const failing = 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() {
    loading.value = true
    error.value = null
    try {
      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
    } catch (e) {
      error.value = e
    } finally {
      loading.value = false
    }
  }

  async function loadMore() {
    if (!hasMore.value || cursor.value == null) return
    loading.value = true
    try {
      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
    } catch (e) {
      error.value = e
    } finally {
      loading.value = false
    }
  }

  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
  }

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