-- docs/tag-ddl.sql
-- W3-1 태그 + 검색 확장. 멱등(IF NOT EXISTS / DO $$ guard). search_path=dev.

-- 1) 통합 태그 마스터
CREATE TABLE IF NOT EXISTS tags (
    id          BIGSERIAL PRIMARY KEY,
    name        VARCHAR(20)  NOT NULL,
    slug        VARCHAR(40)  NOT NULL,
    tag_type    VARCHAR(10)  NOT NULL,
    is_active   BOOLEAN      NOT NULL DEFAULT FALSE,
    created_by  BIGINT       NULL,
    created_at  TIMESTAMP    NOT NULL DEFAULT now()
);

DO $$
BEGIN
    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'chk_tags_name_len') THEN
        ALTER TABLE tags ADD CONSTRAINT chk_tags_name_len
            CHECK (char_length(name) BETWEEN 2 AND 20);
    END IF;
    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'chk_tags_type') THEN
        ALTER TABLE tags ADD CONSTRAINT chk_tags_type
            CHECK (tag_type IN ('GAME', 'JAM', 'COMMON'));
    END IF;
END $$;

DO $$
BEGIN
    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'fk_tags_created_by') THEN
        ALTER TABLE tags ADD CONSTRAINT fk_tags_created_by
            FOREIGN KEY (created_by) REFERENCES users(id);
    END IF;
END $$;

CREATE UNIQUE INDEX IF NOT EXISTS uq_tags_slug ON tags (slug);
CREATE UNIQUE INDEX IF NOT EXISTS uq_tags_name ON tags (name);
CREATE INDEX IF NOT EXISTS idx_tags_type_active ON tags (tag_type, is_active);

-- 2) 게임-태그 조인 (N:M)
CREATE TABLE IF NOT EXISTS game_tags (
    id         BIGSERIAL PRIMARY KEY,
    game_id    BIGINT    NOT NULL,
    tag_id     BIGINT    NOT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT now()
);
CREATE UNIQUE INDEX IF NOT EXISTS uq_game_tags ON game_tags (game_id, tag_id);
CREATE INDEX IF NOT EXISTS idx_game_tags_tag ON game_tags (tag_id);
DO $$
BEGIN
    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'fk_game_tags_game') THEN
        ALTER TABLE game_tags ADD CONSTRAINT fk_game_tags_game
            FOREIGN KEY (game_id) REFERENCES games(id);
    END IF;
    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'fk_game_tags_tag') THEN
        ALTER TABLE game_tags ADD CONSTRAINT fk_game_tags_tag
            FOREIGN KEY (tag_id) REFERENCES tags(id);
    END IF;
END $$;

-- 3) 잼-태그 조인 (N:M, jams 는 W2-1 소관)
CREATE TABLE IF NOT EXISTS jam_tags (
    id         BIGSERIAL PRIMARY KEY,
    jam_id     BIGINT    NOT NULL,
    tag_id     BIGINT    NOT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT now()
);
CREATE UNIQUE INDEX IF NOT EXISTS uq_jam_tags ON jam_tags (jam_id, tag_id);
CREATE INDEX IF NOT EXISTS idx_jam_tags_tag ON jam_tags (tag_id);
DO $$
BEGIN
    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'fk_jam_tags_jam') THEN
        ALTER TABLE jam_tags ADD CONSTRAINT fk_jam_tags_jam
            FOREIGN KEY (jam_id) REFERENCES jams(id);
    END IF;
    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'fk_jam_tags_tag') THEN
        ALTER TABLE jam_tags ADD CONSTRAINT fk_jam_tags_tag
            FOREIGN KEY (tag_id) REFERENCES tags(id);
    END IF;
END $$;

-- 4) 방문 로그 (dedupe 가능)
CREATE TABLE IF NOT EXISTS game_views (
    id         BIGSERIAL    PRIMARY KEY,
    game_id    BIGINT       NOT NULL,
    viewer_key VARCHAR(200) NOT NULL,
    viewed_at  TIMESTAMP    NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS idx_game_views_game ON game_views (game_id);
CREATE INDEX IF NOT EXISTS idx_game_views_dedupe ON game_views (game_id, viewer_key, viewed_at);
DO $$
BEGIN
    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'fk_game_views_game') THEN
        ALTER TABLE game_views ADD CONSTRAINT fk_game_views_game
            FOREIGN KEY (game_id) REFERENCES games(id);
    END IF;
END $$;

-- 5) games 비정규화 방문수 카운터
ALTER TABLE games ADD COLUMN IF NOT EXISTS view_count INTEGER NOT NULL DEFAULT 0;
CREATE INDEX IF NOT EXISTS idx_games_view_count ON games (view_count);