-- =====================================================================================
-- Schema: 用户等级表
-- 位置：docs/sql/10_schema/user/
-- 对象类型：Schema (DDL)
-- 版本：v1
-- 说明：用户等级（经验值/折扣/展示/状态），支持逻辑删除
-- =====================================================================================

CREATE TABLE IF NOT EXISTS public.ak_user_levels (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

  name TEXT NOT NULL,
  level_weight INT NOT NULL,
  min_experience INT NOT NULL DEFAULT 0,
  discount_percent INT NOT NULL DEFAULT 100,

  is_visible BOOLEAN NOT NULL DEFAULT TRUE,
  status INT NOT NULL DEFAULT 1,

  icon_url TEXT NULL,
  bg_image_url TEXT NULL,
  bg_style_json JSONB NULL,

  remark TEXT NULL,

  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  deleted_at TIMESTAMPTZ NULL,

  CONSTRAINT ak_user_levels_level_weight_nonnegative CHECK (level_weight >= 0),
  CONSTRAINT ak_user_levels_min_experience_nonnegative CHECK (min_experience >= 0),
  CONSTRAINT ak_user_levels_discount_percent_range CHECK (discount_percent BETWEEN 1 AND 100)
);

-- 唯一性（仅对未删除记录生效）
CREATE UNIQUE INDEX IF NOT EXISTS ak_user_levels_name_uniq_active
  ON public.ak_user_levels (name)
  WHERE deleted_at IS NULL;

CREATE UNIQUE INDEX IF NOT EXISTS ak_user_levels_level_weight_uniq_active
  ON public.ak_user_levels (level_weight)
  WHERE deleted_at IS NULL;

-- 常用查询索引
CREATE INDEX IF NOT EXISTS ak_user_levels_active_filter_idx
  ON public.ak_user_levels (status, is_visible)
  WHERE deleted_at IS NULL;

CREATE INDEX IF NOT EXISTS ak_user_levels_min_experience_idx
  ON public.ak_user_levels (min_experience)
  WHERE deleted_at IS NULL;

CREATE INDEX IF NOT EXISTS ak_user_levels_level_weight_desc_idx
  ON public.ak_user_levels (level_weight DESC)
  WHERE deleted_at IS NULL;