import { useState, useMemo } from "react"
import { useQuery } from "@tanstack/react-query"
import {
  getAssetLibraries,
  getAssets,
  type AssetLibraryItem,
  type AssetItem as ApiAssetItem,
} from "@/api/assets"
import { mapLibrary, mapAsset, type AssetItem, type LibraryItem } from "../types"

/**
 * 素材库数据 Hook
 * 封装视频库列表、素材列表的数据查询，以及筛选、搜索状态管理
 */
export function useAssetsData() {
  /* ── 视频库列表查询 ── */
  const { data: apiLibraries = [], isLoading: libLoading } = useQuery<AssetLibraryItem[], Error>({
    queryKey: ["asset-libraries"],
    queryFn: getAssetLibraries,
    staleTime: 60_000,
  })

  const libraries: LibraryItem[] = useMemo(
    () =>
      (Array.isArray(apiLibraries) ? apiLibraries : [])
        .map(mapLibrary)
        .filter((lib) => lib.kind === "video"),
    [apiLibraries],
  )

  /* ── 当前选中的视频库 ── */
  const [activeLibId, setActiveLibId] = useState<string>("")

  // 当库列表加载完成后，自动选中第一个
  const effectiveLibId = activeLibId || libraries[0]?.id || ""

  /* ── 当前库的素材列表查询 ── */
  const {
    data: apiAssets = { items: [], total: 0 },
    isLoading: assetsLoading,
    isError: assetsError,
    error: assetsErrorObj,
    refetch: refetchAssets,
  } = useQuery<{ items: ApiAssetItem[]; total: number }, Error>({
    queryKey: ["assets", effectiveLibId],
    queryFn: () =>
      getAssets(effectiveLibId, {
        // 拉取所有非删除状态的素材，让用户上传后立刻能看到"处理中"的素材
        status: "ready,uploading,ingesting,processing,pending,error,failed",
      }),
    enabled: !!effectiveLibId,
    staleTime: 30_000,
  })

  const assets: AssetItem[] = useMemo(
    () => (Array.isArray(apiAssets?.items) ? apiAssets.items : []).map(mapAsset),
    [apiAssets],
  )

  /* ── 筛选状态 ── */
  const [searchText, setSearchText] = useState("")
  const [filterType, setFilterType] = useState<string>("all")
  const [filterTime, setFilterTime] = useState<string>("all")

  /* ── 筛选后的素材列表 ── */
  const filteredAssets = useMemo(() => {
    let list = assets

    /* 按素材类型过滤 */
    if (filterType !== "all") {
      list = list.filter((a) => a.kind === filterType)
    }

    /* 按时间筛选 */
    if (filterTime !== "all") {
      const now = new Date()
      list = list.filter((a) => {
        const d = new Date(a.createdAt)
        const diffDays = (now.getTime() - d.getTime()) / (1000 * 60 * 60 * 24)
        if (filterTime === "today") return diffDays < 1
        if (filterTime === "week") return diffDays < 7
        if (filterTime === "month") return diffDays < 30
        return true
      })
    }

    /* 搜索 */
    if (searchText.trim()) {
      const q = searchText.trim().toLowerCase()
      list = list.filter((a) => a.name.toLowerCase().includes(q))
    }

    return list
  }, [assets, filterType, filterTime, searchText])

  return {
    // 视频库
    libraries,
    libLoading,
    activeLibId,
    setActiveLibId,
    effectiveLibId,
    // 素材列表
    assets,
    assetsLoading,
    assetsError,
    assetsErrorObj,
    refetchAssets,
    // 筛选
    searchText,
    setSearchText,
    filterType,
    setFilterType,
    filterTime,
    setFilterTime,
    filteredAssets,
  }
}