CREATE TABLE shows_v4 (
	id TEXT PRIMARY KEY,
	title TEXT NOT NULL,
	starts_at_utc TEXT,
	twitch_title TEXT NOT NULL DEFAULT '',
	announcement_text TEXT NOT NULL DEFAULT '',
	status TEXT NOT NULL CHECK (status IN ('draft', 'ready', 'live', 'completed')),
	revision INTEGER NOT NULL DEFAULT 1 CHECK (revision >= 1),
	created_at_utc TEXT NOT NULL,
	updated_at_utc TEXT NOT NULL
);

CREATE TABLE show_sections_v4 (
	id TEXT PRIMARY KEY,
	show_id TEXT NOT NULL REFERENCES shows_v4(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 AND explicit_duration_seconds <= 86400)
	),
	is_reserve_bank INTEGER NOT NULL DEFAULT 0 CHECK (is_reserve_bank IN (0, 1)),
	UNIQUE (show_id, position)
);

CREATE TABLE piece_usages_v4 (
	id TEXT PRIMARY KEY,
	show_section_id TEXT NOT NULL REFERENCES show_sections_v4(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 AND duration_seconds <= 86400),
	title_snapshot TEXT NOT NULL,
	intro_snapshot TEXT NOT NULL DEFAULT '',
	research_snapshot TEXT NOT NULL DEFAULT '',
	moderation_snapshot TEXT NOT NULL DEFAULT '',
	transition_snapshot TEXT NOT NULL DEFAULT '',
	presentation_snapshot TEXT NOT NULL DEFAULT '',
	own_notes TEXT NOT NULL DEFAULT '',
	is_reserve INTEGER NOT NULL DEFAULT 0 CHECK (is_reserve IN (0, 1)),
	UNIQUE (show_section_id, position)
);

INSERT INTO shows_v4 (
	id, title, starts_at_utc, twitch_title, announcement_text, status, revision,
	created_at_utc, updated_at_utc
)
SELECT id, title, starts_at_utc, twitch_title, announcement_text, status, 1,
	created_at_utc, updated_at_utc
FROM shows;

INSERT INTO show_sections_v4 (
	id, show_id, name, category_id, position, explicit_duration_seconds, is_reserve_bank
)
SELECT id, show_id, name, category_id, position, explicit_duration_seconds, 0
FROM show_sections;

INSERT INTO show_sections_v4 (
	id, show_id, name, category_id, position, explicit_duration_seconds, is_reserve_bank
)
SELECT 'reserve-bank-' || id, id, 'Reservebank', NULL,
	COALESCE((SELECT max(position) + 1 FROM show_sections WHERE show_id = shows.id), 0), NULL, 1
FROM shows;

INSERT INTO piece_usages_v4 (
	id, show_section_id, original_piece_id, position, status, duration_seconds,
	title_snapshot, intro_snapshot, research_snapshot, moderation_snapshot,
	transition_snapshot, presentation_snapshot, own_notes, is_reserve
)
SELECT
	u.id,
	CASE WHEN u.is_reserve = 1 THEN 'reserve-bank-' || s.show_id ELSE u.show_section_id END,
	u.original_piece_id,
	CASE WHEN u.is_reserve = 1 THEN
		(
			SELECT count(*) - 1
			FROM piece_usages earlier
			JOIN show_sections earlier_section ON earlier_section.id = earlier.show_section_id
			WHERE earlier.is_reserve = 1 AND earlier_section.show_id = s.show_id
			AND (earlier_section.position < s.position OR
				(earlier_section.position = s.position AND earlier.position < u.position) OR
				(earlier_section.position = s.position AND earlier.position = u.position AND earlier.id <= u.id))
		)
	ELSE u.position END,
	u.status,
	u.duration_seconds,
	u.title_snapshot,
	u.intro_snapshot,
	COALESCE(p.research_text, ''),
	u.moderation_snapshot,
	u.transition_snapshot,
	u.presentation_snapshot,
	'',
	u.is_reserve
FROM piece_usages u
JOIN show_sections s ON s.id = u.show_section_id
LEFT JOIN pieces p ON p.id = u.original_piece_id;

DROP TABLE piece_usages;
DROP TABLE show_sections;
DROP TABLE shows;

ALTER TABLE shows_v4 RENAME TO shows;
ALTER TABLE show_sections_v4 RENAME TO show_sections;
ALTER TABLE piece_usages_v4 RENAME TO piece_usages;

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);
CREATE UNIQUE INDEX idx_one_reserve_bank_per_show
	ON show_sections(show_id) WHERE is_reserve_bank = 1;

CREATE TABLE show_templates (
	id TEXT PRIMARY KEY,
	name TEXT NOT NULL UNIQUE,
	description TEXT NOT NULL DEFAULT ''
);

CREATE TABLE show_template_sections (
	id TEXT PRIMARY KEY,
	template_id TEXT NOT NULL REFERENCES show_templates(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 AND explicit_duration_seconds <= 86400)
	),
	UNIQUE (template_id, position)
);

CREATE INDEX idx_show_template_sections_template
	ON show_template_sections(template_id, position);

INSERT INTO show_templates (id, name, description) VALUES
	('template-default', 'Standardablauf', 'Start, zwei JC-Blöcke und zwei Spiele.'),
	('template-games', 'Spieleabend', 'Ein ruhiger Einstieg und drei flexible Spieleblöcke.');

INSERT INTO show_template_sections (
	id, template_id, name, category_id, position, explicit_duration_seconds
) VALUES
	('template-default-start', 'template-default', 'Start', NULL, 0, 300),
	('template-default-jc-reaction', 'template-default', 'JC / Reaction', NULL, 1, NULL),
	('template-default-game-1', 'template-default', 'Spiel 1', NULL, 2, 3600),
	('template-default-jc', 'template-default', 'JC', NULL, 3, NULL),
	('template-default-game-2', 'template-default', 'Spiel 2', NULL, 4, 3600),
	('template-games-start', 'template-games', 'Start', NULL, 0, 300),
	('template-games-game-1', 'template-games', 'Spiel 1', NULL, 1, 2700),
	('template-games-break', 'template-games', 'Pause & Chat', NULL, 2, 600),
	('template-games-game-2', 'template-games', 'Spiel 2', NULL, 3, 2700),
	('template-games-game-3', 'template-games', 'Spiel 3', NULL, 4, 2700);