// 社交 BI v2 的数据层：负责 master/overview/funnel/kpi 接口的拉取与派生行，
// 视图不直接调 API，只消费这里的产物（原始 snake_case 指标行 + 维度字段）。

import { useCallback, useEffect, useMemo, useRef, useState } from "react";
import { fetchSocialBiFunnel, fetchSocialBiKpi, fetchSocialBiMaster, fetchSocialBiOverview } from "../api.js";
import { DEFAULT_TIME_ZONE, rangeEndMs, rangeStartMs } from "../utils/time.js";
import { ALL, appSelectionMatches, regionSelectionMatches, resolveDateRange } from "./state.js";

export const SOCIAL_BI_TZ = DEFAULT_TIME_ZONE;
export const SOCIAL_BI_FUNNEL_APP_CODES = ["lalu", "huwaa", "fami"];

export function useSocialBiData(filters) {
  const [master, setMaster] = useState(null);
  // 数据请求等 master 结果落地后再发：否则会先用兜底 App 列表打一轮，master 到达后立刻重打一轮（整轮浪费）。
  const [isMasterSettled, setIsMasterSettled] = useState(false);
  const [overview, setOverview] = useState(null);
  const [funnel, setFunnel] = useState(null);
  const [kpi, setKpi] = useState(null);
  const [isLoading, setIsLoading] = useState(true);
  const [errors, setErrors] = useState([]);
  const [refreshToken, setRefreshToken] = useState(0);
  const requestSeq = useRef(0);

  useEffect(() => {
    let ignore = false;
    fetchSocialBiMaster()
      .then((data) => {
        if (!ignore && data) {
          setMaster(data);
        }
      })
      .catch(() => {
        if (!ignore) {
          setMaster(null);
        }
      })
      .finally(() => {
        if (!ignore) {
          setIsMasterSettled(true);
        }
      });
    return () => {
      ignore = true;
    };
  }, []);

  // range 只依赖日期相关筛选：切换粒度/区域/App 多选不应触发接口重拉（那些是纯前端派生）。
  const { customEnd, customStart, preset } = filters;
  const range = useMemo(
    () => resolveDateRange({ customEnd, customStart, preset }, SOCIAL_BI_TZ),
    [customEnd, customStart, preset]
  );
  const appCodes = useMemo(() => {
    const available = (master?.apps || []).map((app) => app.app_code);
    if (!filters.apps.length || filters.apps.includes(ALL)) {
      return available;
    }
    return filters.apps.filter((appCode) => !available.length || available.includes(appCode));
  }, [filters.apps, master]);
  const funnelAppCodes = useMemo(() => {
    const available = (master?.apps || []).map((app) => app.app_code).filter((appCode) => SOCIAL_BI_FUNNEL_APP_CODES.includes(appCode));
    if (!filters.apps.length || filters.apps.includes(ALL)) {
      return available;
    }
    const selected = filters.apps.filter((appCode) => available.includes(appCode));
    return selected.length ? selected : available;
  }, [filters.apps, master]);

  useEffect(() => {
    if (!isMasterSettled) {
      return;
    }
    const sequence = ++requestSeq.current;
    const startMs = rangeStartMs(range, SOCIAL_BI_TZ);
    const endMs = rangeEndMs(range, SOCIAL_BI_TZ);
    setIsLoading(true);
    Promise.allSettled([
      fetchSocialBiOverview({ appCodes, endMs, startMs, statTz: SOCIAL_BI_TZ }),
      fetchSocialBiFunnel({ appCodes: funnelAppCodes, endMs, startMs, statTz: SOCIAL_BI_TZ }),
      fetchSocialBiKpi({ appCodes, endMs, startMs, statTz: SOCIAL_BI_TZ })
    ]).then(([overviewResult, funnelResult, kpiResult]) => {
      if (sequence !== requestSeq.current) {
        return;
      }
      const nextErrors = [];
      if (overviewResult.status === "fulfilled") {
        setOverview(overviewResult.value);
        (overviewResult.value?.apps || []).forEach((app) => {
          if (app.error) {
            nextErrors.push(`${app.app_name || app.app_code}: ${app.error}`);
          }
        });
      } else {
        setOverview(null);
        nextErrors.push(`统计数据加载失败: ${overviewResult.reason?.message || "未知错误"}`);
      }
      if (funnelResult.status === "fulfilled") {
        setFunnel(funnelResult.value);
        (funnelResult.value?.apps || []).forEach((app) => {
          if (app.error) {
            nextErrors.push(`${app.app_name || app.app_code}: ${app.error}`);
          }
        });
      } else {
        setFunnel(null);
        nextErrors.push(`埋点漏斗加载失败: ${funnelResult.reason?.message || "未知错误"}`);
      }
      if (kpiResult.status === "fulfilled") {
        setKpi(kpiResult.value);
        Object.entries(kpiResult.value?.app_errors || {}).forEach(([appCode, message]) => {
          nextErrors.push(`${appCode}: ${message}`);
        });
      } else {
        setKpi(null);
        nextErrors.push(`运营充值数据加载失败: ${kpiResult.reason?.message || "未知错误"}`);
      }
      setErrors(nextErrors);
      setIsLoading(false);
    });
  }, [appCodes, funnelAppCodes, isMasterSettled, range, refreshToken]);

  const refresh = useCallback(() => {
    setRefreshToken((current) => current + 1);
  }, []);

  const derived = useMemo(() => deriveRows(overview, filters, master), [filters, master, overview]);

  return {
    appCodes,
    derived,
    errors,
    funnel,
    funnelAppCodes,
    isLoading,
    kpi,
    master,
    overview,
    range,
    refresh
  };
}

// deriveRows 输出四类行，全部带维度字段 + 原始指标字段：
// appTotals/appDaily（App 粒度）、regionTotals/regionDaily（大区粒度，已按顶栏区域选择过滤）、
// countryTotals（国家粒度，已按国家→区域目录归一 region_id 并跟随区域筛选）。restricted=true 表示该 App 已被数据范围裁剪。
function deriveRows(overview, filters, master) {
  const appTotals = [];
  const appDaily = [];
  const regionTotals = [];
  const regionDaily = [];
  const countryTotals = [];
  const appErrors = [];
  const regionByCountry = buildRegionByCountryIndex(master);

  (overview?.apps || []).forEach((app) => {
    if (!appSelectionMatches(filters.apps, app.app_code)) {
      return;
    }
    const context = {
      app_code: app.app_code,
      app_name: app.app_name || app.app_code,
      kind: app.kind,
      restricted: Boolean(app.restricted)
    };
    if (app.error) {
      appErrors.push({ ...context, error: app.error });
      return;
    }
    appTotals.push({ ...context, ...(app.total || {}) });
    (app.daily_series || []).forEach((row) => {
      appDaily.push({ ...context, ...row, stat_day: row.stat_day || row.label });
    });
    (app.region_breakdown || []).forEach((row) => {
      if (!regionSelectionMatches(filters.regions, app.app_code, Number(row.region_id ?? 0))) {
        return;
      }
      regionTotals.push({
        ...context,
        ...row,
        region_id: Number(row.region_id ?? 0),
        region_name: row.region_name || row.region_code || `区域 ${row.region_id}`
      });
    });
    (app.daily_region_breakdown || []).forEach((row) => {
      if (!regionSelectionMatches(filters.regions, app.app_code, Number(row.region_id ?? 0))) {
        return;
      }
      regionDaily.push({
        ...context,
        ...row,
        region_id: Number(row.region_id ?? 0),
        region_name: row.region_name || row.region_code || `区域 ${row.region_id}`,
        stat_day: row.stat_day || row.label
      });
    });
    (app.country_breakdown || []).forEach((row) => {
      const countryCode = row.country_code || String(row.country_id || "");
      // legacy 国家行不带 region_id，用区域目录（countries 列表）归一，保证下钻与区域筛选口径一致。
      let regionId = Number(row.region_id ?? 0);
      let regionName = row.region_name || "";
      if (!regionId) {
        const region = regionByCountry.get(`${app.app_code}:${String(countryCode).toUpperCase()}`);
        if (region) {
          regionId = region.region_id;
          regionName = region.region_name || region.region_code || regionName;
        }
      }
      if (!regionSelectionMatches(filters.regions, app.app_code, regionId)) {
        return;
      }
      countryTotals.push({
        ...context,
        ...row,
        country_code: countryCode,
        country_name: row.country_name || row.country || row.country_code || `国家 ${row.country_id}`,
        region_id: regionId,
        region_name: regionName
      });
    });
  });

  // 顶栏选了区域时，App 合计/日行切换成所选区域行的聚合视角由各视图用 regionScoped 判断。
  const regionScoped = Boolean(filters.regions.length && !filters.regions.includes(ALL));
  return { appDaily, appErrors, appTotals, countryTotals, regionDaily, regionScoped, regionTotals };
}

function buildRegionByCountryIndex(master) {
  const index = new Map();
  (master?.regions || []).forEach((region) => {
    (region.countries || []).forEach((countryCode) => {
      const key = `${region.app_code}:${String(countryCode).toUpperCase()}`;
      if (!index.has(key)) {
        index.set(key, region);
      }
    });
  });
  return index;
}