-- ============================================================================
-- Phase V2-6: Admin CRM 고도화 — 권한 확장 + 감사로그 + admin_note
-- ============================================================================

-- ----------------------------------------------------------------------------
-- 1. profiles.role CHECK 확장: super_admin 추가
-- ----------------------------------------------------------------------------
ALTER TABLE public.profiles DROP CONSTRAINT IF EXISTS profiles_role_check;
ALTER TABLE public.profiles
  ADD CONSTRAINT profiles_role_check
  CHECK (role IN ('user', 'admin', 'super_admin'));

-- ----------------------------------------------------------------------------
-- 2. audit_log 테이블 — 관리자 작업 감사 기록 (before/after diff 포함)
-- ----------------------------------------------------------------------------
CREATE TABLE IF NOT EXISTS public.audit_log (
  id          bigserial PRIMARY KEY,
  admin_id    uuid NOT NULL REFERENCES auth.users(id),
  action      text NOT NULL,
  target_type text NOT NULL,
  target_id   uuid NOT NULL,
  before_data jsonb,
  after_data  jsonb,
  memo        text NOT NULL,
  created_at  timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_audit_log_target ON public.audit_log(target_type, target_id);
CREATE INDEX IF NOT EXISTS idx_audit_log_admin  ON public.audit_log(admin_id);
CREATE INDEX IF NOT EXISTS idx_audit_log_date   ON public.audit_log(created_at DESC);

-- audit_log RLS
ALTER TABLE public.audit_log ENABLE ROW LEVEL SECURITY;

CREATE POLICY "admin_read_audit_log" ON public.audit_log
  FOR SELECT TO authenticated
  USING ((auth.jwt() -> 'app_metadata' ->> 'role') IN ('admin', 'super_admin'));

-- INSERT는 service_role만 (Edge Function에서 기록)

-- ----------------------------------------------------------------------------
-- 3. subscriptions.admin_note 컬럼
-- ----------------------------------------------------------------------------
ALTER TABLE public.subscriptions
  ADD COLUMN IF NOT EXISTS admin_note text;

-- ----------------------------------------------------------------------------
-- 4. 기존 RLS 정책 업데이트 — admin OR super_admin
-- ----------------------------------------------------------------------------
DROP POLICY IF EXISTS "admin_read_all_profiles" ON public.profiles;
CREATE POLICY "admin_read_all_profiles" ON public.profiles
  FOR SELECT TO authenticated
  USING ((auth.jwt() -> 'app_metadata' ->> 'role') IN ('admin', 'super_admin'));

DROP POLICY IF EXISTS "admin_read_all_subscriptions" ON public.subscriptions;
CREATE POLICY "admin_read_all_subscriptions" ON public.subscriptions
  FOR SELECT TO authenticated
  USING ((auth.jwt() -> 'app_metadata' ->> 'role') IN ('admin', 'super_admin'));

DROP POLICY IF EXISTS "admin_read_all_daily_usage" ON public.daily_usage;
CREATE POLICY "admin_read_all_daily_usage" ON public.daily_usage
  FOR SELECT TO authenticated
  USING ((auth.jwt() -> 'app_metadata' ->> 'role') IN ('admin', 'super_admin'));

-- subscriptions: super_admin 쓰기 정책
DROP POLICY IF EXISTS "super_admin_write_subscriptions" ON public.subscriptions;
CREATE POLICY "super_admin_write_subscriptions" ON public.subscriptions
  FOR ALL TO authenticated
  USING ((auth.jwt() -> 'app_metadata' ->> 'role') = 'super_admin')
  WITH CHECK ((auth.jwt() -> 'app_metadata' ->> 'role') = 'super_admin');

-- profiles: super_admin이 role 컬럼 수정 가능
DROP POLICY IF EXISTS "super_admin_update_profiles" ON public.profiles;
CREATE POLICY "super_admin_update_profiles" ON public.profiles
  FOR UPDATE TO authenticated
  USING ((auth.jwt() -> 'app_metadata' ->> 'role') = 'super_admin')
  WITH CHECK ((auth.jwt() -> 'app_metadata' ->> 'role') = 'super_admin');

-- ----------------------------------------------------------------------------
-- 5. 통계 RPC 함수 — admin 전용
-- ----------------------------------------------------------------------------

-- 5.1 일별 feature 집계
CREATE OR REPLACE FUNCTION public.admin_usage_by_feature(
  p_from date, p_to date
) RETURNS TABLE(date date, feature text, total_count bigint, unique_users bigint)
LANGUAGE sql SECURITY DEFINER STABLE
SET search_path = public
AS $$
  SELECT du.date, du.feature,
         SUM(du.count)::bigint AS total_count,
         COUNT(DISTINCT du.user_id)::bigint AS unique_users
    FROM public.daily_usage du
   WHERE du.date BETWEEN p_from AND p_to
   GROUP BY du.date, du.feature
   ORDER BY du.date, du.feature;
$$;

REVOKE ALL ON FUNCTION public.admin_usage_by_feature(date, date) FROM public;
GRANT EXECUTE ON FUNCTION public.admin_usage_by_feature(date, date) TO authenticated;

-- 5.2 유저별 사용량 랭킹
CREATE OR REPLACE FUNCTION public.admin_top_users(
  p_from date, p_to date, p_limit integer DEFAULT 20
) RETURNS TABLE(user_id uuid, name text, total_count bigint, feature_count bigint)
LANGUAGE sql SECURITY DEFINER STABLE
SET search_path = public
AS $$
  SELECT du.user_id, p.name,
         SUM(du.count)::bigint AS total_count,
         COUNT(DISTINCT du.feature)::bigint AS feature_count
    FROM public.daily_usage du
    JOIN public.profiles p ON p.id = du.user_id
   WHERE du.date BETWEEN p_from AND p_to
   GROUP BY du.user_id, p.name
   ORDER BY total_count DESC
   LIMIT p_limit;
$$;

REVOKE ALL ON FUNCTION public.admin_top_users(date, date, integer) FROM public;
GRANT EXECUTE ON FUNCTION public.admin_top_users(date, date, integer) TO authenticated;

-- 5.3 DAU 추이
CREATE OR REPLACE FUNCTION public.admin_dau(
  p_from date, p_to date
) RETURNS TABLE(date date, active_users bigint)
LANGUAGE sql SECURITY DEFINER STABLE
SET search_path = public
AS $$
  SELECT du.date, COUNT(DISTINCT du.user_id)::bigint AS active_users
    FROM public.daily_usage du
   WHERE du.date BETWEEN p_from AND p_to
   GROUP BY du.date
   ORDER BY du.date;
$$;

REVOKE ALL ON FUNCTION public.admin_dau(date, date) FROM public;
GRANT EXECUTE ON FUNCTION public.admin_dau(date, date) TO authenticated;