CREATE TABLE IF NOT EXISTS media (
    id BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,

    playlist_id BIGINT,

    room_id BIGINT NOT NULL REFERENCES rooms(id) ON DELETE RESTRICT,
    creator_id BIGINT REFERENCES users(id) ON DELETE RESTRICT,

    name VARCHAR(500) NOT NULL,
    description TEXT NOT NULL DEFAULT '',

    position DOUBLE PRECISION NOT NULL,

    source_provider SMALLINT NOT NULL,

    source_config JSONB NOT NULL,

    provider_instance_name VARCHAR(64),

    cover_file_reference_id BIGINT NULL REFERENCES file_references(id) ON DELETE SET NULL,
    thumbnail_file_reference_id BIGINT NULL REFERENCES file_references(id) ON DELETE SET NULL,

    added_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,

    version INTEGER NOT NULL DEFAULT 0,

    CONSTRAINT media_playlist_same_room_fk
        FOREIGN KEY (playlist_id, room_id)
        REFERENCES playlists(id, room_id)
        ON DELETE RESTRICT,
    CONSTRAINT media_provider_instance_fk
        FOREIGN KEY (provider_instance_name)
        REFERENCES media_provider_instances(name)
        ON DELETE RESTRICT,
    CONSTRAINT media_source_config_object
        CHECK (jsonb_typeof(source_config) = 'object')
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_media_id_room_unique ON media(id, room_id);

CREATE INDEX IF NOT EXISTS idx_media_room ON media(room_id);
CREATE INDEX IF NOT EXISTS idx_media_creator ON media(creator_id);
CREATE INDEX IF NOT EXISTS idx_media_added_at ON media(added_at DESC);
CREATE INDEX IF NOT EXISTS idx_media_source_provider ON media(source_provider);
CREATE INDEX IF NOT EXISTS idx_media_provider_name ON media(provider_instance_name);
CREATE INDEX IF NOT EXISTS idx_media_source_config ON media USING gin(source_config);
CREATE INDEX IF NOT EXISTS idx_media_name_trgm ON media USING gin(name gin_trgm_ops);
CREATE INDEX IF NOT EXISTS idx_media_description_trgm ON media USING gin(description gin_trgm_ops);
CREATE INDEX IF NOT EXISTS idx_media_playlist_covering ON media(playlist_id, position, id, source_provider, name);
CREATE INDEX IF NOT EXISTS idx_media_room_root_covering ON media(room_id, position, id, source_provider, name)
    WHERE playlist_id IS NULL;

CREATE TRIGGER trigger_media_updated_at
    BEFORE UPDATE ON media
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_at_column();