import { describe, it, expect, beforeEach } from "vitest";
import { FsTaskRepository } from "@/storage/FsTaskRepository";
import { InMemoryFileSystem } from "../helpers/InMemoryFileSystem";
import { ITaskRepository } from "@/ports";
import { Task } from "@/model/task";

describe("FsTaskRepository", () => {
	let fs: InMemoryFileSystem;
	let repo: ITaskRepository;

	const folder = "/tasks";

	const sampleTask = {
		title: "Fix login bug",
		description: "Token validation error",
		status: "todo" as const,
		priority: "high" as const,
		tags: ["bug", "frontend"],
		assignee: "ivanov",
	};

	beforeEach(() => {
		fs = new InMemoryFileSystem();
		repo = new FsTaskRepository(fs, ".task.md");
	});

	it("creates a task and writes it as a .task.md file", async () => {
		const task = await repo.create(folder, sampleTask);

		expect(task.id).toBeTruthy();
		expect(task.title).toBe("Fix login bug");
		expect(task.created).toBeTruthy();
		expect(task.updated).toBe(task.created);

		const files = await fs.readdir(folder);
		expect(files).toHaveLength(1);
		expect(files[0]).toMatch(/\.task\.md$/);

		const content = await fs.readFile(`${folder}/${files[0]}`);
		expect(content).toContain("Fix login bug");
		expect(content).toContain("status: todo");
	});

	it("list returns created tasks sorted by updated desc", async () => {
		const a = await repo.create(folder, { ...sampleTask, title: "A" });
		await delay(10);
		const b = await repo.create(folder, { ...sampleTask, title: "B" });

		const tasks = await repo.list(folder);
		expect(tasks).toHaveLength(2);
		expect(tasks[0].title).toBe("B");
		expect(tasks[1].title).toBe("A");
	});

	it("getById returns the correct task", async () => {
		const created = await repo.create(folder, sampleTask);
		const found = await repo.getById(folder, created.id);
		expect(found).toEqual(created);
	});

	it("getById returns undefined for unknown id", async () => {
		const found = await repo.getById(folder, "nonexistent");
		expect(found).toBeUndefined();
	});

	it("update modifies the file and updates timestamp", async () => {
		const task = await repo.create(folder, sampleTask);
		await delay(5);
		const updated: Task = { ...task, title: "Fixed!", status: "done" };

		await repo.update(folder, updated);
		const found = await repo.getById(folder, task.id);

		expect(found!.title).toBe("Fixed!");
		expect(found!.status).toBe("done");
		expect(new Date(found!.updated).getTime()).toBeGreaterThan(
			new Date(task.updated).getTime(),
		);
	});

	it("delete removes the task file", async () => {
		const task = await repo.create(folder, sampleTask);
		await repo.delete(folder, task.id);

		const tasks = await repo.list(folder);
		expect(tasks).toHaveLength(0);
	});

	it("delete is a no-op for unknown id", async () => {
		await expect(repo.delete(folder, "nope")).resolves.toBeUndefined();
	});

	it("list returns empty array for non-existent folder", async () => {
		const tasks = await repo.list("/nonexistent");
		expect(tasks).toEqual([]);
	});

	it("filters files by extension", async () => {
		fs.writeFile(`${folder}/notes.txt`, "hello");
		fs.writeFile(`${folder}/chore.md`, "---\nid: x\n---\n");

		await repo.create(folder, sampleTask);

		const tasks = await repo.list(folder);
		expect(tasks).toHaveLength(1);
	});

	it("skips unparseable .task.md files silently", async () => {
		fs.writeFile(`${folder}/corrupt.task.md`, "not valid frontmatter");

		await repo.create(folder, sampleTask);
		const tasks = await repo.list(folder);
		expect(tasks).toHaveLength(1);
	});
});

function delay(ms: number): Promise<void> {
	return new Promise((r) => setTimeout(r, ms));
}