-- Starbook 典藏/活动藏品体系重构 - 数据库迁移
-- 创建时间: 2026-04-17
-- 状态: 新建（非破坏性变更）

-- =============================================
-- 1. 典藏藏品表 collection_assets
-- =============================================
CREATE TABLE IF NOT EXISTS collection_assets (
    id                  BIGSERIAL PRIMARY KEY,
    asset_id            BIGINT UNIQUE NOT NULL,
    owner_uid           BIGINT NOT NULL,
    star_id             BIGINT NOT NULL,
    name                VARCHAR(100) NOT NULL,
    cover_url           VARCHAR(500) NOT NULL,
    category            VARCHAR(50) NOT NULL,
    like_count          INT NOT NULL DEFAULT 0,
    status              SMALLINT NOT NULL DEFAULT 0,
    metadata            JSONB,
    created_at          BIGINT NOT NULL,
    updated_at          BIGINT NOT NULL,

    CONSTRAINT uk_collection_owner_star_name UNIQUE (owner_uid, star_id, name)
);

CREATE INDEX IF NOT EXISTS idx_collection_owner_star ON collection_assets (owner_uid, star_id);
CREATE INDEX IF NOT EXISTS idx_collection_category ON collection_assets (category);
CREATE INDEX IF NOT EXISTS idx_collection_asset_id ON collection_assets (asset_id);

-- =============================================
-- 2. 活动藏品表 activity_assets
-- =============================================
CREATE TABLE IF NOT EXISTS activity_assets (
    id                  BIGSERIAL PRIMARY KEY,
    asset_id            BIGINT UNIQUE NOT NULL,
    owner_uid           BIGINT NOT NULL,
    star_id             BIGINT NOT NULL,
    activity_id         BIGINT NOT NULL,
    activity_type       VARCHAR(50) NOT NULL,
    name                VARCHAR(100) NOT NULL,
    cover_url           VARCHAR(500) NOT NULL,
    like_count          INT NOT NULL DEFAULT 0,
    status              SMALLINT NOT NULL DEFAULT 0,
    metadata            JSONB,
    created_at          BIGINT NOT NULL,
    updated_at          BIGINT NOT NULL,

    CONSTRAINT uk_activity_owner_activity_name UNIQUE (owner_uid, activity_id, name)
);

CREATE INDEX IF NOT EXISTS idx_activity_owner ON activity_assets (owner_uid, activity_id);
CREATE INDEX IF NOT EXISTS idx_activity_star ON activity_assets (star_id, activity_id);
CREATE INDEX IF NOT EXISTS idx_activity_type ON activity_assets (activity_type);
CREATE INDEX IF NOT EXISTS idx_activity_asset_id ON activity_assets (asset_id);

-- =============================================
-- 3. 统一索引表 asset_registry
-- =============================================
CREATE TABLE IF NOT EXISTS asset_registry (
    id                  BIGSERIAL PRIMARY KEY,
    asset_id            BIGINT NOT NULL,
    asset_type          VARCHAR(20) NOT NULL,
    owner_uid           BIGINT NOT NULL,
    star_id             BIGINT NOT NULL,
    -- 普通藏品专属字段（其他类型时为 NULL）
    grade               SMALLINT,
    -- 典藏专属字段（其他类型时为 NULL）
    collection_category VARCHAR(50),
    -- 活动专属字段（其他类型时为 NULL）
    activity_id         BIGINT,
    activity_type       VARCHAR(50),
    -- 公共字段
    status              SMALLINT NOT NULL DEFAULT 0,
    like_count          INT NOT NULL DEFAULT 0,
    created_at          BIGINT NOT NULL,
    updated_at          BIGINT NOT NULL,

    CONSTRAINT uk_registry_asset_type_id UNIQUE (asset_type, asset_id),
    CONSTRAINT uk_registry_owner_star_type_asset UNIQUE (owner_uid, star_id, asset_type, asset_id)
);

CREATE INDEX IF NOT EXISTS idx_registry_owner_star ON asset_registry (owner_uid, star_id);
CREATE INDEX IF NOT EXISTS idx_registry_type_star ON asset_registry (asset_type, star_id);
CREATE INDEX IF NOT EXISTS idx_registry_star_grade ON asset_registry (star_id, grade) WHERE asset_type = 'regular';
CREATE INDEX IF NOT EXISTS idx_registry_star_activity ON asset_registry (star_id, activity_id) WHERE asset_type = 'activity';

-- =============================================
-- 注释说明
-- =============================================
COMMENT ON TABLE collection_assets IS '典藏藏品表';
COMMENT ON TABLE activity_assets IS '活动藏品表';
COMMENT ON TABLE asset_registry IS '资产统一索引表';

COMMENT ON COLUMN collection_assets.category IS '典藏子分类（如 limited, classic）';
COMMENT ON COLUMN activity_assets.activity_type IS '活动类型（如 birthday, anniversary, concert）';
COMMENT ON COLUMN asset_registry.asset_type IS '资产类型：regular(普通) | collection(典藏) | activity(活动)';
COMMENT ON COLUMN asset_registry.grade IS '普通藏品等级：1/2/3...（仅 regular 类型有效）';

-- =============================================
-- 4. 修改 assets 表：将 rarity 改名为 grade
-- =============================================
-- 注意：如果 assets.rarity 字段不存在（新建数据库），则跳过此步
DO $$
BEGIN
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'assets' AND column_name = 'rarity') THEN
        ALTER TABLE assets RENAME COLUMN rarity TO grade;
        COMMENT ON COLUMN assets.grade IS '星册等级：1/2/3...（铸爱流程创建时默认值为1）';
    END IF;
END $$;