/**
 * 列表共用加载器：分页、同请求去重、身份隔离、初次加载回显缓存与刷新失败保留旧结果。
 * 缓存来自统一 auth 模块；旧查询/旧账号/已卸载组件的响应不能覆盖当前列表。
 */
import { onMounted } from "vue";
import { watch } from "vue";
import { onScopeDispose } from "vue";
import { ref } from "vue";
import { apiCacheKey } from "~/lib/auth.js";
import { apiCacheVersion } from "~/lib/auth.js";
import { useApi } from "~/lib/auth.js";
import { writeApiCache } from "~/lib/auth.js";
import { readApiCache } from "~/lib/auth.js";
import { clearApiCache } from "~/lib/auth.js";
/** u 为接口路径，d 可提供查询参数、外部 loader、行键和缓存命名空间等现有列表选项。 */
function u(u, d = {}) {
  let f = useApi(),
    p =
      d.identity ??
      (typeof f.identity == `function` ? () => f.identity() : void 0),
    m = d.retainOnRefreshError !== !1,
    h = ref([]),
    g = ref(0),
    _ = ref(!1),
    v = ref(``),
    y = ref(!1),
    b = ref(1),
    x = ref(d.limit ?? 10),
    S = 0,
    C = ``,
    w = !0,
    T = !1,
    E = null;
  // 身份变更或查询构造失败时统一作废在途序号，清理可见数据，防止跨账号残留。
  function D() {
    (S++,
      (h.value = []),
      (g.value = 0),
      (_.value = !1),
      (v.value = ``),
      (y.value = !1),
      (C = ``),
      (E = null),
      (w = !1));
  }
  (p &&
    watch(
      p,
      () => {
        (clearApiCache(), D());
      },
      {
        flush: `sync`,
      },
    ),
    onScopeDispose(() => {
      ((T = !0), S++, (E = null));
    }));
  // 优先使用业务行键，否则使用 id；没有稳定键的行不做对象复用。
  function O(e) {
    if (d.rowKey) return d.rowKey(e);
    if (
      e &&
      typeof e == `object` &&
      `id` in e &&
      (typeof e.id == `string` || typeof e.id == `number`)
    )
      return e.id;
  }
  /** 构造查询快照、读取一次初始缓存，再发真实请求刷新；同参数同身份共享 Promise。 */
  function k() {
    if (T) return Promise.resolve();
    let e,
      t,
      n = p?.();
    try {
      ((e = {
        page: b.value,
        limit: x.value,
        ...(d.params?.() ?? {}),
      }),
        (t = apiCacheKey(
          u,
          e,
          typeof d.snapshotKey == `function` ? d.snapshotKey() : d.snapshotKey,
        )));
    } catch (e) {
      return (
        D(),
        (v.value = e instanceof Error ? e.message : `查询条件无效`),
        Promise.resolve()
      );
    }
    if (E?.query === t && E.identity === n) return E.promise;
    let r = ++S,
      o = () => !T && r === S && (!p || p() === n);
    ((_.value = !0), (v.value = ``));
    let l = y.value && t === C,
      k = p ? readApiCache(n, t) : void 0,
      A = apiCacheVersion();
    (l || ((h.value = []), (g.value = 0), (y.value = !1)),
      w &&
        k &&
        ((h.value = k.list),
        (g.value = k.count),
        (y.value = !0),
        (C = t),
        (l = !0)),
      (w = !1));
    let j = (async () => {
      try {
        let r = d.loader ? await d.loader(e) : await f.get(u, e);
        if (!o()) return;
        // 复用同 id 的行对象以保留 UI 引用，但删除新响应已不存在的字段，避免旧值残留。
        let i = new Map(
          h.value.flatMap((e) => {
            let t = O(e);
            return t === void 0 ? [] : [[t, e]];
          }),
        );
        ((h.value = (r.list ?? []).map((e) => {
          let t = O(e),
            n = t === void 0 ? void 0 : i.get(t);
          if (!n || typeof n != `object` || typeof e != `object` || !e)
            return e;
          let r = n;
          for (let t of Object.keys(r))
            Object.prototype.hasOwnProperty.call(e, t) || delete r[t];
          return (Object.assign(r, e), n);
        })),
          (g.value = r.count ?? 0),
          (y.value = !0),
          (C = t),
          p &&
            writeApiCache(
              n,
              t,
              {
                list: h.value,
                count: g.value,
              },
              A,
            ));
      } catch (e) {
        // 只有同一查询已拥有结果时才可保留旧列表；新筛选失败不能继续展示上一查询。
        if (!o()) return;
        ((v.value = e instanceof Error ? e.message : `加载失败`),
          (!m || !l) && ((h.value = []), (g.value = 0), (y.value = !1)));
      } finally {
        (o() && (_.value = !1), r === S && (E = null));
      }
    })();
    return (
      o() &&
        _.value &&
        (E = {
          query: t,
          identity: n,
          promise: j,
        }),
      j
    );
  }
  // PrimeVue 页码从 0 开始，后端接口从 1 开始；切筛选的 reload 则回到第一页。
  function A(e) {
    ((b.value = e.page + 1), (x.value = e.rows), k());
  }
  function j() {
    ((b.value = 1), k());
  }
  return (
    d.immediate !== !1 && onMounted(k),
    {
      list: h,
      total: g,
      loading: _,
      error: v,
      hasResult: y,
      page: b,
      limit: x,
      load: k,
      onPage: A,
      reload: j,
    }
  );
}
export { u as t };