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import fs from 'node:fs/promises';
import os from 'node:os';
import path from 'node:path';

import {afterEach, describe, expect, it} from 'vitest';
import * as temp from '../lib/temp.js';
import * as utils from '../lib/utils.js';

describe('Creates and tracks temporary directories', () => {
    const osTemp = os.tmpdir();
    afterEach(async () => {
        await temp.cleanup();
        temp.resetStats();
    });

    it('creates directories under $TMPDIR', async () => {
        expect(temp.getStats()).toEqual({numCreated: 0, numActive: 0, numRemoved: 0, numAlreadyGone: 0});
        const newTemp = await temp.mkdir('prefix');
        expect(newTemp).toContain(osTemp);
        expect(await utils.dirExists(newTemp)).toBe(true);
        expect(temp.getStats()).toEqual({numCreated: 1, numActive: 1, numRemoved: 0, numAlreadyGone: 0});
    });
    it('creates directories with prefix', async () => {
        const newTemp = await temp.mkdir('prefix');
        expect(newTemp).toContain('prefix');
    });
    it('creates uniquely-named directories', async () => {
        const temp1 = await temp.mkdir('prefix');
        const temp2 = await temp.mkdir('prefix');
        const temp3 = await temp.mkdir('prefix');
        expect(temp1).not.toEqual(temp2);
        expect(temp1).not.toEqual(temp3);
        expect(temp2).not.toEqual(temp3);
        expect(temp.getStats()).toEqual({numCreated: 3, numActive: 3, numRemoved: 0, numAlreadyGone: 0});
    });
    it('cleans up directories even if not empty', async () => {
        const newTemp1 = await temp.mkdir('prefix');
        await utils.ensureFileExists(path.join(newTemp1, 'some', 'dirs', 'under', 'file'));
        const newTemp2 = await temp.mkdir('prefix');
        const newTemp3 = await temp.mkdir('prefix');
        expect(temp.getStats()).toEqual({numCreated: 3, numActive: 3, numRemoved: 0, numAlreadyGone: 0});
        await temp.cleanup();
        expect(temp.getStats()).toEqual({numCreated: 3, numActive: 0, numRemoved: 3, numAlreadyGone: 0});
        expect(await utils.dirExists(newTemp1)).toBe(false);
        expect(await utils.dirExists(newTemp2)).toBe(false);
        expect(await utils.dirExists(newTemp3)).toBe(false);
    });
    it('counts already-cleaned-up directiories', async () => {
        const newTemp = await temp.mkdir('prefix');
        await fs.rm(newTemp, {recursive: true});
        expect(temp.getStats()).toEqual({numCreated: 1, numActive: 1, numRemoved: 0, numAlreadyGone: 0});
        await temp.cleanup();
        expect(temp.getStats()).toEqual({numCreated: 1, numActive: 0, numRemoved: 0, numAlreadyGone: 1});
    });
});