import { computed, ref, watch } from "vue";
import { defineStore } from "pinia";
import { loadDataApi } from "@/services/api";
import { useAuthStore } from "./auth";

export const usePermissionStore = defineStore("permissions", () => {
  const authStore = useAuthStore();
  const loadedPrincipalKey = ref("");
  const modules = ref([]);
  const grantedPageIds = ref([]);
  const moduleCodes = ref([]);
  const powerCodes = ref([]);
  let loadingPromise = null;
  let loadingPrincipalKey = "";
  let loadVersion = 0;

  const moduleByCode = computed(
    () => new Map(modules.value.map((module) => [String(module.b_code || ""), module])),
  );
  const moduleById = computed(
    () => new Map(modules.value.map((module) => [String(module.b_id || ""), module])),
  );
  const grantedPageSet = computed(() => new Set(grantedPageIds.value));
  const powerSet = computed(() => new Set(powerCodes.value));
  const isG3soft = computed(() => {
    return (
      String(authStore.user?.account || "")
        .trim()
        .toLowerCase() === "g3soft"
    );
  });

  async function load() {
    const userId = String(authStore.user?.id || "");
    const principalKey = `${String(authStore.orgId || "")}:${userId}`;
    if (isG3soft.value) {
      const elevatedKey = `g3soft:${principalKey}`;
      if (loadedPrincipalKey.value === elevatedKey) return;
      loadVersion++;
      loadingPromise = null;
      loadingPrincipalKey = "";
      loadedPrincipalKey.value = elevatedKey;
      modules.value = [];
      grantedPageIds.value = [];
      moduleCodes.value = [];
      powerCodes.value = [];
      return;
    }
    if (!/^\d+$/.test(userId)) throw new Error("登录用户 ID 无效，请重新登录");
    if (loadedPrincipalKey.value === principalKey) return;
    if (loadingPromise && loadingPrincipalKey === principalKey) return loadingPromise;

    const requestVersion = ++loadVersion;
    loadingPrincipalKey = principalKey;
    const request = Promise.all([
      loadDataApi("s_module", "b_canuse = 1", "b_id ASC"),
      loadDataApi("b_user_module", `b_user_id = ${userId}`, "b_id ASC"),
      loadDataApi("b_user_power", `b_user_id = ${userId}`, "b_id ASC"),
      loadDataApi("s_module_power", "b_canuse = 1", "b_id ASC"),
    ])
      .then(([moduleResponse, userModules, userPowers, powers]) => {
        if (requestVersion !== loadVersion) return;
        const activeModules = moduleResponse.data || [];
        const moduleById = new Map(activeModules.map((module) => [String(module.b_id), module]));
        const powerById = new Map(powers.data.map((power) => [String(power.b_id), power]));
        const pageIds = userModules.data
          .map((item) => String(item.b_module_id || ""))
          .filter(Boolean);
        modules.value = activeModules;
        grantedPageIds.value = pageIds;
        moduleCodes.value = userModules.data
          .map((item) => moduleById.get(String(item.b_module_id))?.b_code)
          .filter(Boolean);
        powerCodes.value = userPowers.data
          .map((item) => powerById.get(String(item.b_power_id)))
          .filter(Boolean)
          .map((power) => `${String(power.b_module_id)}.${power.b_code}`)
          .filter(Boolean);
        loadedPrincipalKey.value = principalKey;
      })
      .finally(() => {
        if (requestVersion !== loadVersion) return;
        loadingPromise = null;
        loadingPrincipalKey = "";
      });
    loadingPromise = request;
    return request;
  }

  function resolvePageId(code) {
    let module = moduleByCode.value.get(String(code || ""));
    const visited = new Set();
    while (module) {
      const moduleId = String(module.b_id || "");
      if (!moduleId || visited.has(moduleId)) return "";
      visited.add(moduleId);
      if (module.b_module_type === "page") return moduleId;
      const parentId = String(module.b_parent_id || "");
      module = parentId ? moduleById.value.get(parentId) : null;
    }
    return "";
  }

  function canAccess(moduleCode) {
    if (isG3soft.value || !moduleCode) return true;
    const module = moduleByCode.value.get(String(moduleCode));
    if (!module) return false;
    const moduleId = String(module.b_id || "");
    const pageId = resolvePageId(moduleCode);
    return grantedPageSet.value.has(moduleId) || (!!pageId && grantedPageSet.value.has(pageId));
  }

  function canPower(scopeCode, powerCode) {
    if (isG3soft.value) return true;
    const module = moduleByCode.value.get(String(scopeCode || ""));
    if (!module || !canAccess(scopeCode)) return false;
    const moduleId = String(module.b_id || "");
    const pageId = resolvePageId(scopeCode);
    return (
      powerSet.value.has(`${moduleId}.${powerCode}`) ||
      (!!pageId && powerSet.value.has(`${pageId}.${powerCode}`))
    );
  }

  function clear() {
    loadVersion++;
    loadingPromise = null;
    loadingPrincipalKey = "";
    loadedPrincipalKey.value = "";
    modules.value = [];
    grantedPageIds.value = [];
    moduleCodes.value = [];
    powerCodes.value = [];
  }

  watch(
    () => [authStore.orgId, authStore.user?.id, authStore.user?.account, authStore.token],
    clear,
  );

  return {
    load,
    canAccess,
    canPower,
    clear,
    modules,
    grantedPageIds,
    moduleCodes,
    powerCodes,
    isG3soft,
  };
});