import { Task } from "@/model/task";
import {
	TASK_STATUS_META,
	TASK_STATUS_ORDER,
	type TaskStatus,
} from "@/model/taskStatus";

export type KanbanColumn = {
	status: TaskStatus;
	label: string;
	tasks: Task[];
};

export type KanbanBoard = {
	columns: KanbanColumn[];
};

export type BuildKanbanBoardOptions = {
	/** When false (default), columns with meta.defaultHidden are omitted. */
	showHiddenStatuses?: boolean;
};

/** Build status columns; empty columns kept. Hidden statuses optional. */
export function buildKanbanBoard(
	tasks: Task[],
	options: BuildKanbanBoardOptions = {},
): KanbanBoard {
	const showHidden = options.showHiddenStatuses ?? false;
	const statuses = TASK_STATUS_ORDER.filter(
		(status) => showHidden || !TASK_STATUS_META[status].defaultHidden,
	);

	const columns: KanbanColumn[] = statuses.map((status) => {
		const columnTasks = tasks
			.filter((task) => task.status === status)
			.slice()
			.sort(
				(a, b) => new Date(b.updated).getTime() - new Date(a.updated).getTime(),
			);

		return {
			status,
			label: TASK_STATUS_META[status].label,
			tasks: columnTasks,
		};
	});

	return { columns };
}