-- ============================================================
-- 02_create_functions.sql
-- 自动分级函数 + 任务自动生成函数 + 通知推送函数
-- ============================================================

-- 自动分级函数：基于 v_store_action_priority_deep_april 逻辑
-- 输入月份参数，输出门店分级结果
CREATE OR REPLACE FUNCTION analytics.f_auto_grade_stores(p_month DATE)
RETURNS TABLE(
  store_code TEXT,
  store_name TEXT,
  priority TEXT,
  problem_count INT,
  problem_combination TEXT,
  received NUMERIC,
  scale_tier TEXT,
  business_type TEXT
) AS $$
BEGIN
  -- 当前仅4月数据可用，直接查询现有视图
  -- 后续月份需先刷新物化视图再查询
  RETURN QUERY
  SELECT v.store_code, v.store_name, v.action_priority AS priority,
         v.problem_count, v.problem_combination,
         v.received, v.scale_tier, v.business_type
  FROM analytics.v_store_action_priority_deep_april v
  ORDER BY CASE v.action_priority
    WHEN 'P0-修复数据口径' THEN 1
    WHEN 'P0-综合专项整改' THEN 2
    WHEN 'P1-重点整改' THEN 3
    WHEN 'P2-单项改善' THEN 4
    WHEN '标杆候选' THEN 5
    ELSE 6
  END, v.received DESC;
END;
$$ LANGUAGE plpgsql STABLE;

-- 任务自动生成函数：按分级结果自动生成门店任务
-- 每店最多2个核心指标，P0门店可增加数据修复任务
CREATE OR REPLACE FUNCTION analytics.f_generate_store_tasks(p_month DATE)
RETURNS TABLE(generated INT, message TEXT) AS $$
DECLARE
  v_count INT := 0;
  v_store RECORD;
  v_task1_indicator TEXT;
  v_task1_action TEXT;
  v_task1_target TEXT;
  v_task2_indicator TEXT;
  v_task2_action TEXT;
  v_task2_target TEXT;
  v_deadline DATE;
BEGIN
  v_deadline := (p_month + INTERVAL '1 month' - INTERVAL '1 day')::date;

  FOR v_store IN
    SELECT * FROM analytics.f_auto_grade_stores(p_month)
  LOOP
    -- 根据问题组合生成任务1
    v_task1_indicator := NULL;
    v_task1_action := NULL;
    v_task1_target := NULL;

    -- 根据问题组合确定第一个任务
    IF v_store.problem_combination LIKE '%优惠偏高%' THEN
      v_task1_indicator := '优惠率';
      v_task1_action := '拆解平台折扣和营销方案，每周复核高折扣账单，退出低毛利满减商品';
      v_task1_target := '优惠率降低2个百分点';
    ELSIF v_store.problem_combination LIKE '%实际成本严重超耗%' THEN
      v_task1_indicator := '实际成本率';
      v_task1_action := '获取SKU成本，分析超耗原料，调整低毛利商品和套餐';
      v_task1_target := '实际成本率降低至理论+10%以内';
    ELSIF v_store.problem_combination LIKE '%理论毛利偏低%' THEN
      v_task1_indicator := '理论毛利率';
      v_task1_action := '分析商品结构，提升高毛利品类占比，优化套餐组合';
      v_task1_target := '理论毛利率提升1个百分点';
    ELSIF v_store.problem_combination LIKE '%会员复购偏低%' THEN
      v_task1_indicator := '会员复购率';
      v_task1_action := '执行消费后第3天和第7天触达，使用会员价和复购券';
      v_task1_target := '复购率提升5个百分点';
    ELSIF v_store.problem_combination LIKE '%异常%' THEN
      v_task1_indicator := '异常率';
      v_task1_action := '全额优惠必须填写原因和审批人，周度抽查收银员及营销方案';
      v_task1_target := '异常率降低至1.5%以下';
    ELSIF v_store.problem_combination LIKE '%饮品搭售偏低%' THEN
      v_task1_indicator := '饮品搭售率';
      v_task1_action := '按午晚市设计主食加饮品组合销售，培训搭售话术';
      v_task1_target := '饮品搭售率提升5个百分点';
    ELSIF v_store.problem_combination LIKE '%平台成本偏高%' THEN
      v_task1_indicator := '平台加权成本率';
      v_task1_action := '设置平台成本率红线，优化满减和折扣策略';
      v_task1_target := '平台成本率降低1个百分点';
    ELSIF v_store.priority = '标杆候选' THEN
      v_task1_indicator := '经验输出';
      v_task1_action := '总结核心SKU结构、会员运营、平台价格纪律等可推广经验';
      v_task1_target := '输出至少1个标准化经验模块';
    ELSIF v_store.priority = '持续跟踪' THEN
      v_task1_indicator := '经营稳定性';
      v_task1_action := '保持现有经营水平，关注核心指标波动';
      v_task1_target := '核心指标不恶化';
    END IF;

    -- 生成第一个任务
    IF v_task1_indicator IS NOT NULL THEN
      INSERT INTO analytics.store_task
        (plan_month, store_code, store_name, priority, problem_indicator,
         problem_description, action_required, owner, deadline, status,
         verification_indicator)
      VALUES (p_month, v_store.store_code, v_store.store_name, v_store.priority,
              v_task1_indicator, v_store.problem_combination,
              v_task1_action, '店长/区域经理', v_deadline, '待启动',
              v_task1_target)
      ON CONFLICT DO NOTHING;

      v_count := v_count + 1;
    END IF;

    -- 根据问题组合生成第二个任务（如果有多个问题）
    IF v_store.problem_count >= 2 THEN
      v_task2_indicator := NULL;
      v_task2_action := NULL;
      v_task2_target := NULL;

      IF v_store.problem_combination LIKE '%优惠偏高%' AND v_task1_indicator != '优惠率' THEN
        v_task2_indicator := '优惠率';
        v_task2_action := '拆解平台折扣和营销方案，每周复核高折扣账单';
        v_task2_target := '优惠率降低2个百分点';
      ELSIF v_store.problem_combination LIKE '%会员复购偏低%' AND v_task1_indicator != '会员复购率' THEN
        v_task2_indicator := '会员复购率';
        v_task2_action := '执行消费后第3天和第7天触达，使用会员价和复购券';
        v_task2_target := '复购率提升5个百分点';
      ELSIF v_store.problem_combination LIKE '%异常%' AND v_task1_indicator != '异常率' THEN
        v_task2_indicator := '异常率';
        v_task2_action := '全额优惠必须填写原因和审批人，周度抽查';
        v_task2_target := '异常率降低至1.5%以下';
      ELSIF v_store.problem_combination LIKE '%理论毛利偏低%' AND v_task1_indicator != '理论毛利率' THEN
        v_task2_indicator := '理论毛利率';
        v_task2_action := '分析商品结构，提升高毛利品类占比';
        v_task2_target := '理论毛利率提升1个百分点';
      ELSIF v_store.problem_combination LIKE '%饮品搭售偏低%' AND v_task1_indicator != '饮品搭售率' THEN
        v_task2_indicator := '饮品搭售率';
        v_task2_action := '按午晚市设计主食加饮品组合销售';
        v_task2_target := '饮品搭售率提升5个百分点';
      END IF;

      IF v_task2_indicator IS NOT NULL THEN
        INSERT INTO analytics.store_task
          (plan_month, store_code, store_name, priority, problem_indicator,
           problem_description, action_required, owner, deadline, status,
           verification_indicator)
        VALUES (p_month, v_store.store_code, v_store.store_name, v_store.priority,
                v_task2_indicator, v_store.problem_combination,
                v_task2_action, '店长/区域经理', v_deadline, '待启动',
                v_task2_target)
        ON CONFLICT DO NOTHING;

        v_count := v_count + 1;
      END IF;
    END IF;

    -- P0-修复数据口径 门店增加数据修复任务
    IF v_store.priority = 'P0-修复数据口径' THEN
      INSERT INTO analytics.store_task
        (plan_month, store_code, store_name, priority, problem_indicator,
         problem_description, action_required, owner, deadline, status,
         verification_indicator)
      VALUES (p_month, v_store.store_code, v_store.store_name, v_store.priority,
              '数据口径修复', '成本口径异常',
              '核实成本单位与门店映射关系，修正盘点数据口径', '信息部/财务部',
              v_deadline, '待启动', '成本口径校验通过')
      ON CONFLICT DO NOTHING;

      v_count := v_count + 1;
    END IF;
  END LOOP;

  RETURN QUERY SELECT v_count, format('已为 %s 家门店生成 %s 条任务',
    (SELECT count(DISTINCT store_code) FROM analytics.store_task WHERE plan_month = p_month),
    v_count);
END;
$$ LANGUAGE plpgsql;

-- 每日通知推送函数
CREATE OR REPLACE FUNCTION analytics.f_dispatch_daily_notifications()
RETURNS TABLE(dispatched INT, message TEXT) AS $$
DECLARE
  v_count INT := 0;
  v_store RECORD;
BEGIN
  -- 为每家门店的待启动任务标记为已推送
  -- 实际推送由应用层处理，这里只做标记
  UPDATE analytics.store_task
  SET updated_at = NOW()
  WHERE status = '待启动' AND updated_at < NOW() - INTERVAL '1 day';

  GET DIAGNOSTICS v_count = ROW_COUNT;

  RETURN QUERY SELECT v_count, format('已推送 %s 条待办任务通知', v_count);
END;
$$ LANGUAGE plpgsql;