CREATE TABLE section_categories (
	id TEXT PRIMARY KEY,
	name TEXT NOT NULL UNIQUE,
	color TEXT NOT NULL,
	sort_order INTEGER NOT NULL CHECK (sort_order >= 0)
);

CREATE TABLE formats (
	id TEXT PRIMARY KEY,
	name TEXT NOT NULL UNIQUE
);

CREATE TABLE topics (
	id TEXT PRIMARY KEY,
	name TEXT NOT NULL UNIQUE
);

CREATE TABLE pieces (
	id TEXT PRIMARY KEY,
	title TEXT NOT NULL,
	summary TEXT NOT NULL DEFAULT '',
	format_id TEXT REFERENCES formats(id) ON DELETE SET NULL,
	status TEXT NOT NULL CHECK (status IN ('inbox', 'preparing', 'ready', 'archived')),
	duration_seconds INTEGER NOT NULL DEFAULT 0 CHECK (duration_seconds >= 0),
	intro TEXT NOT NULL DEFAULT '',
	moderation_notes TEXT NOT NULL DEFAULT '',
	transition_text TEXT NOT NULL DEFAULT '',
	presentation_text TEXT NOT NULL DEFAULT '',
	created_at_utc TEXT NOT NULL,
	updated_at_utc TEXT NOT NULL
);

CREATE TABLE piece_topics (
	piece_id TEXT NOT NULL REFERENCES pieces(id) ON DELETE CASCADE,
	topic_id TEXT NOT NULL REFERENCES topics(id) ON DELETE CASCADE,
	PRIMARY KEY (piece_id, topic_id)
);

CREATE TABLE piece_category_suggestions (
	piece_id TEXT NOT NULL REFERENCES pieces(id) ON DELETE CASCADE,
	category_id TEXT NOT NULL REFERENCES section_categories(id) ON DELETE CASCADE,
	PRIMARY KEY (piece_id, category_id)
);

CREATE TABLE piece_sources (
	id TEXT PRIMARY KEY,
	piece_id TEXT NOT NULL REFERENCES pieces(id) ON DELETE CASCADE,
	label TEXT NOT NULL,
	url TEXT NOT NULL,
	timecode_seconds INTEGER CHECK (timecode_seconds IS NULL OR timecode_seconds >= 0),
	position INTEGER NOT NULL CHECK (position >= 0)
);

CREATE TABLE shows (
	id TEXT PRIMARY KEY,
	title TEXT NOT NULL,
	starts_at_utc TEXT NOT NULL,
	twitch_title TEXT NOT NULL DEFAULT '',
	announcement_text TEXT NOT NULL DEFAULT '',
	status TEXT NOT NULL CHECK (status IN ('draft', 'ready', 'live', 'completed')),
	created_at_utc TEXT NOT NULL,
	updated_at_utc TEXT NOT NULL
);

CREATE TABLE show_sections (
	id TEXT PRIMARY KEY,
	show_id TEXT NOT NULL REFERENCES shows(id) ON DELETE CASCADE,
	name TEXT NOT NULL,
	category_id TEXT REFERENCES section_categories(id) ON DELETE SET NULL,
	position INTEGER NOT NULL CHECK (position >= 0),
	explicit_duration_seconds INTEGER CHECK (
		explicit_duration_seconds IS NULL OR explicit_duration_seconds >= 0
	),
	UNIQUE (show_id, position)
);

CREATE TABLE piece_usages (
	id TEXT PRIMARY KEY,
	show_section_id TEXT NOT NULL REFERENCES show_sections(id) ON DELETE CASCADE,
	original_piece_id TEXT REFERENCES pieces(id) ON DELETE SET NULL,
	position INTEGER NOT NULL CHECK (position >= 0),
	status TEXT NOT NULL CHECK (status IN ('open', 'current', 'done', 'skipped')),
	duration_seconds INTEGER NOT NULL CHECK (duration_seconds >= 0),
	title_snapshot TEXT NOT NULL,
	intro_snapshot TEXT NOT NULL DEFAULT '',
	moderation_snapshot TEXT NOT NULL DEFAULT '',
	transition_snapshot TEXT NOT NULL DEFAULT '',
	presentation_snapshot TEXT NOT NULL DEFAULT '',
	is_reserve INTEGER NOT NULL DEFAULT 0 CHECK (is_reserve IN (0, 1)),
	UNIQUE (show_section_id, position)
);

CREATE INDEX idx_pieces_status ON pieces(status);
CREATE INDEX idx_shows_status_start ON shows(status, starts_at_utc);
CREATE INDEX idx_sections_show ON show_sections(show_id, position);
CREATE INDEX idx_usages_section ON piece_usages(show_section_id, position);