import fm from "front-matter";
import * as yaml from "js-yaml";
import { Task, TaskPriority, TaskStatus } from "@/model/task";

function toISO(value: unknown): string {
	if (value instanceof Date) return value.toISOString();
	if (typeof value === "string") return value;
	return new Date().toISOString();
}

export function parseTaskFile(content: string): Task {
	const parsed = fm<Record<string, unknown>>(content);
	const data = parsed.attributes;
	return {
		id: data.id as string,
		title: data.title as string,
		description: parsed.body.trim(),
		status: (data.status as TaskStatus) ?? "todo",
		priority: (data.priority as TaskPriority) ?? "medium",
		tags: (data.tags as string[]) ?? [],
		assignee: (data.assignee as string) ?? "",
		created: toISO(data.created),
		updated: toISO(data.updated),
	};
}

export function serializeTask(task: Task): string {
	const frontmatter: Record<string, unknown> = {
		id: task.id,
		title: task.title,
		status: task.status,
		priority: task.priority,
		tags: task.tags,
		assignee: task.assignee,
		created: task.created,
		updated: task.updated,
	};

	const yamlStr = yaml.dump(frontmatter).trim();
	return `---\n${yamlStr}\n---\n${task.description}`;
}