import { Task, TaskPriority, TaskStatus } from "@/model/task";

export type TaskFilter = {
	statuses?: TaskStatus[];
	priorities?: TaskPriority[];
	query?: string;
	tags?: string[];
};

export function filterTasks(tasks: Task[], filter: TaskFilter): Task[] {
	const statuses = filter.statuses;
	const priorities = filter.priorities;
	const tags = filter.tags;
	const query = filter.query?.trim().toLowerCase() ?? "";

	return tasks.filter((task) => {
		if (statuses && statuses.length > 0 && !statuses.includes(task.status)) {
			return false;
		}
		if (
			priorities &&
			priorities.length > 0 &&
			!priorities.includes(task.priority)
		) {
			return false;
		}
		if (tags && tags.length > 0) {
			const hasAll = tags.every((tag) => task.tags.includes(tag));
			if (!hasAll) return false;
		}
		if (query) {
			const inTitle = task.title.toLowerCase().includes(query);
			const inDescription = task.description.toLowerCase().includes(query);
			if (!inTitle && !inDescription) return false;
		}
		return true;
	});
}