import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { readFile, writeFile } from 'node:fs/promises';
import { existsSync } from 'node:fs';
import { join } from 'node:path';
import { newFixture, type Fixture } from '../helpers/fixture.js';

let fixture: Fixture;

beforeEach(async () => {
    vi.resetModules();
    fixture = await newFixture(
        { 'hud.gsc': 'v1', 'zom.gsc': 'v1' },
        ['t5_kino_1', 't5_ascension_1']
    );
});

afterEach(async () => {
    await fixture.cleanup();
});

describe('beta lifecycle', () => {
    it('open → rollback restores original state', async () => {
        const { doPush } = await import('../../src/lib/server/fleet/push.js');
        const { openBeta, rollbackBeta } = await import('../../src/lib/server/fleet/beta.js');
        const { seedServerRegistry } = await import('../../src/lib/server/fleet/servers.js');
        await seedServerRegistry();

        // Populate servers with v1 first
        await doPush({ patterns: ['*'] });

        // Stage a new hud
        await writeFile(join(fixture.staging, 'hud.gsc'), 'v2');

        // Open beta on t5_kino_1 only
        const opened = await openBeta({ name: 'test1', patterns: ['t5_kino_1'] });
        expect(opened.slug).toBe('test1');
        expect(opened.servers).toEqual(['t5_kino_1']);

        // On kino: hud-beta.gsc = v2, hud.OLD = v1, hud.gsc gone
        const kinoSp = join(fixture.t5, 't5_kino_1', 'runtime/plutonium/storage/t5/raw/scripts/sp');
        expect(await readFile(join(kinoSp, 'hud-beta.gsc'), 'utf8')).toBe('v2');
        expect(await readFile(join(kinoSp, 'hud.OLD'), 'utf8')).toBe('v1');
        expect(existsSync(join(kinoSp, 'hud.gsc'))).toBe(false);

        // ascension untouched
        const ascSp = join(fixture.t5, 't5_ascension_1', 'runtime/plutonium/storage/t5/raw/scripts/sp');
        expect(await readFile(join(ascSp, 'hud.gsc'), 'utf8')).toBe('v1');

        // Rollback
        const back = await rollbackBeta('test1');
        expect(back.restored).toContain('hud.gsc');
        expect(await readFile(join(kinoSp, 'hud.gsc'), 'utf8')).toBe('v1');
        expect(existsSync(join(kinoSp, 'hud-beta.gsc'))).toBe(false);
        expect(existsSync(join(kinoSp, 'hud.OLD'))).toBe(false);
    });

    it('open → promote lands the beta on shared/scripts and clears beta files', async () => {
        const { doPush } = await import('../../src/lib/server/fleet/push.js');
        const { openBeta, promoteBeta } = await import('../../src/lib/server/fleet/beta.js');
        const { seedServerRegistry } = await import('../../src/lib/server/fleet/servers.js');
        await seedServerRegistry();

        await doPush({ patterns: ['*'] });
        await writeFile(join(fixture.staging, 'hud.gsc'), 'v2');
        await openBeta({ name: 'promote-me', patterns: ['t5_kino_1'] });

        const kinoSp = join(fixture.t5, 't5_kino_1', 'runtime/plutonium/storage/t5/raw/scripts/sp');
        expect(existsSync(join(kinoSp, 'hud-beta.gsc'))).toBe(true);

        await promoteBeta('promote-me');

        // shared has v2 now
        expect(await readFile(join(fixture.shared, 'hud.gsc'), 'utf8')).toBe('v2');
        // kino has plain hud.gsc = v2, no OLD, no -beta
        expect(await readFile(join(kinoSp, 'hud.gsc'), 'utf8')).toBe('v2');
        expect(existsSync(join(kinoSp, 'hud-beta.gsc'))).toBe(false);
        expect(existsSync(join(kinoSp, 'hud.OLD'))).toBe(false);
    });

    it('refuses to open a beta whose staged file matches an already-owned target', async () => {
        const { doPush } = await import('../../src/lib/server/fleet/push.js');
        const { openBeta, BetaError } = await import('../../src/lib/server/fleet/beta.js');
        const { seedServerRegistry } = await import('../../src/lib/server/fleet/servers.js');
        await seedServerRegistry();
        await doPush({ patterns: ['*'] });

        // First beta claims hud on kino
        await writeFile(join(fixture.staging, 'hud.gsc'), 'v2');
        await openBeta({ name: 'first', patterns: ['t5_kino_1'] });

        // Second attempt on kino should conflict
        await writeFile(join(fixture.staging, 'hud.gsc'), 'v3');
        await expect(openBeta({ name: 'second', patterns: ['t5_kino_1'] })).rejects.toThrow(BetaError);
    });
});