-- =============================================================
-- 038: Announcement targeting system (ported from rwadurian)
-- 公告定向推送系统: 全体用户 / 按标签 / 指定用户
-- =============================================================

-- 1. 公告主表
CREATE TABLE IF NOT EXISTS announcements (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    title VARCHAR(200) NOT NULL,
    content TEXT NOT NULL,
    type VARCHAR(20) NOT NULL DEFAULT 'SYSTEM'
        CHECK (type IN ('SYSTEM','ACTIVITY','REWARD','UPGRADE','ANNOUNCEMENT')),
    priority VARCHAR(10) NOT NULL DEFAULT 'NORMAL'
        CHECK (priority IN ('LOW','NORMAL','HIGH','URGENT')),
    target_type VARCHAR(10) NOT NULL DEFAULT 'ALL'
        CHECK (target_type IN ('ALL','BY_TAG','SPECIFIC')),
    target_config JSONB,
    image_url VARCHAR(500),
    link_url VARCHAR(500),
    is_enabled BOOLEAN NOT NULL DEFAULT true,
    published_at TIMESTAMPTZ,
    expires_at TIMESTAMPTZ,
    created_by UUID,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_announcements_type ON announcements(type);
CREATE INDEX idx_announcements_target ON announcements(target_type);
CREATE INDEX idx_announcements_enabled ON announcements(is_enabled, published_at);

-- 2. 公告标签定向表
CREATE TABLE IF NOT EXISTS announcement_tag_targets (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    announcement_id UUID NOT NULL REFERENCES announcements(id) ON DELETE CASCADE,
    tag VARCHAR(100) NOT NULL
);

CREATE INDEX idx_ann_tag_targets_ann ON announcement_tag_targets(announcement_id);
CREATE INDEX idx_ann_tag_targets_tag ON announcement_tag_targets(tag);

-- 3. 公告用户定向表
CREATE TABLE IF NOT EXISTS announcement_user_targets (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    announcement_id UUID NOT NULL REFERENCES announcements(id) ON DELETE CASCADE,
    user_id UUID NOT NULL
);

CREATE INDEX idx_ann_user_targets_ann ON announcement_user_targets(announcement_id);
CREATE INDEX idx_ann_user_targets_user ON announcement_user_targets(user_id);

-- 4. 公告已读记录表
CREATE TABLE IF NOT EXISTS announcement_reads (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    announcement_id UUID NOT NULL REFERENCES announcements(id) ON DELETE CASCADE,
    user_id UUID NOT NULL,
    read_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE (announcement_id, user_id)
);

CREATE INDEX idx_ann_reads_user ON announcement_reads(user_id);
CREATE INDEX idx_ann_reads_ann ON announcement_reads(announcement_id);

-- 5. 用户标签表
CREATE TABLE IF NOT EXISTS user_tags (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL,
    tag VARCHAR(100) NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE (user_id, tag)
);

CREATE INDEX idx_user_tags_user ON user_tags(user_id);
CREATE INDEX idx_user_tags_tag ON user_tags(tag);