sendou.ink/app/modules/brackets-manager/delete.ts

import type { Storage } from "./types";

export class Delete {
	private readonly storage: Storage;

	/**
	 * Creates an instance of Delete, which will handle cleanly deleting data in the storage.
	 *
	 * @param storage The implementation of Storage.
	 */
	constructor(storage: Storage) {
		this.storage = storage;
	}

	/**
	 * Deletes a stage, and all its components:
	 *
	 * - Groups
	 * - Rounds
	 * - Matches
	 * - Match games
	 *
	 * @param stageId ID of the stage.
	 */
	public stage(stageId: number): void {
		// The order is important here, because the abstract storage can possibly have foreign key checks (e.g. SQL).

		if (!this.storage.delete("match", { stage_id: stageId }))
			throw Error("Could not delete matches.");

		if (!this.storage.delete("round", { stage_id: stageId }))
			throw Error("Could not delete rounds.");

		if (!this.storage.delete("group", { stage_id: stageId }))
			throw Error("Could not delete groups.");

		if (!this.storage.delete("stage", { id: stageId }))
			throw Error("Could not delete the stage.");
	}

	/**
	 * Deletes **the stages** of a tournament (and all their components, see {@link stage | delete.stage()}).
	 *
	 * You are responsible for deleting the tournament itself.
	 *
	 * @param tournamentId ID of the tournament.
	 */
	public tournament(tournamentId: number): void {
		const stages = this.storage.select("stage", {
			tournament_id: tournamentId,
		});
		if (!stages) throw Error("Error getting the stages.");

		for (const stage of stages) this.stage(stage.id);
	}
}