'use strict';

const assert = require('node:assert/strict');
const test = require('node:test');
const fs = require('node:fs');
const path = require('node:path');
const os = require('node:os');
const { findUnusedAssets, collectUuidReferences } = require('../lib/tools/assets-advanced');

function createMockAssetsDir() {
  const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'funplay-unused-test-'));
  const assetsDir = path.join(tmpDir, 'assets');
  fs.mkdirSync(assetsDir, { recursive: true });
  return { tmpDir, assetsDir };
}

function writeFile(dir, relPath, content) {
  const fullPath = path.join(dir, relPath);
  fs.mkdirSync(path.dirname(fullPath), { recursive: true });
  fs.writeFileSync(fullPath, content, 'utf8');
}

test('findUnusedAssets returns assets not referenced by any serialized file', async () => {
  const { tmpDir, assetsDir } = createMockAssetsDir();
  try {
    const usedUuid = 'aaa11111-bbbb-cccc-dddd-eeeeeeee1111';
    writeFile(assetsDir, 'textures/used.png', 'fake-png');
    writeFile(assetsDir, 'textures/used.png.meta', JSON.stringify({ uuid: usedUuid }));

    const unusedUuid = 'aaa22222-bbbb-cccc-dddd-eeeeeeee2222';
    writeFile(assetsDir, 'textures/unused.png', 'fake-png');
    writeFile(assetsDir, 'textures/unused.png.meta', JSON.stringify({ uuid: unusedUuid }));

    writeFile(assetsDir, 'scenes/game.scene', JSON.stringify({
      __type__: 'cc.SceneAsset',
      scene: { __uuid__: usedUuid },
    }));

    const mockListAssets = async () => [
      { uuid: usedUuid, url: 'db://assets/textures/used.png', type: 'cc.Texture2D' },
      { uuid: unusedUuid, url: 'db://assets/textures/unused.png', type: 'cc.Texture2D' },
    ];

    const result = await findUnusedAssets(tmpDir, {}, mockListAssets);
    assert.equal(result.totalScanned, 2);
    assert.equal(result.unusedCount, 1);
    assert.equal(result.unused[0].uuid, unusedUuid);
  } finally {
    fs.rmSync(tmpDir, { recursive: true, force: true });
  }
});

test('findUnusedAssets skips .ts and .scene files from unused list', async () => {
  const { tmpDir, assetsDir } = createMockAssetsDir();
  try {
    const scriptUuid = 'bbb11111-bbbb-cccc-dddd-eeeeeeee3333';
    const sceneUuid = 'bbb22222-bbbb-cccc-dddd-eeeeeeee4444';

    writeFile(assetsDir, 'scripts/MyScript.ts', 'export class MyScript {}');
    writeFile(assetsDir, 'scripts/MyScript.ts.meta', JSON.stringify({ uuid: scriptUuid }));
    writeFile(assetsDir, 'scenes/level.scene', '{}');
    writeFile(assetsDir, 'scenes/level.scene.meta', JSON.stringify({ uuid: sceneUuid }));

    const mockListAssets = async () => [
      { uuid: scriptUuid, url: 'db://assets/scripts/MyScript.ts', type: 'cc.ScriptAsset' },
      { uuid: sceneUuid, url: 'db://assets/scenes/level.scene', type: 'cc.SceneAsset' },
    ];

    const result = await findUnusedAssets(tmpDir, {}, mockListAssets);
    assert.equal(result.totalScanned, 2);
    assert.equal(result.unusedCount, 0);
  } finally {
    fs.rmSync(tmpDir, { recursive: true, force: true });
  }
});

test('findUnusedAssets respects excludeDirectories', async () => {
  const { tmpDir, assetsDir } = createMockAssetsDir();
  try {
    const referencedUuid = 'ccc11111-bbbb-cccc-dddd-eeeeeeee5555';
    const unreferencedUuid = 'ccc22222-bbbb-cccc-dddd-eeeeeeee6666';

    writeFile(assetsDir, 'textures/a.png', 'fake');
    writeFile(assetsDir, 'textures/a.png.meta', JSON.stringify({ uuid: referencedUuid }));
    writeFile(assetsDir, 'internal/b.png', 'fake');
    writeFile(assetsDir, 'internal/b.png.meta', JSON.stringify({ uuid: unreferencedUuid }));

    writeFile(assetsDir, 'internal/hidden.scene', JSON.stringify({
      __type__: 'cc.SceneAsset',
      tex: { __uuid__: referencedUuid },
    }));

    const mockListAssets = async () => [
      { uuid: referencedUuid, url: 'db://assets/textures/a.png', type: 'cc.Texture2D' },
      { uuid: unreferencedUuid, url: 'db://assets/internal/b.png', type: 'cc.Texture2D' },
    ];

    const result = await findUnusedAssets(tmpDir, {
      excludeDirectories: ['internal'],
    }, mockListAssets);

    assert.equal(result.totalScanned, 2);
    assert.equal(result.unusedCount, 2);
  } finally {
    fs.rmSync(tmpDir, { recursive: true, force: true });
  }
});

test('findUnusedAssets respects limit option', async () => {
  const { tmpDir, assetsDir } = createMockAssetsDir();
  try {
    const assets = [];
    for (let i = 0; i < 5; i++) {
      const uuid = `ddd${i}1111-bbbb-cccc-dddd-eeeeeeee777${i}`;
      writeFile(assetsDir, `textures/tex${i}.png`, 'fake');
      writeFile(assetsDir, `textures/tex${i}.png.meta`, JSON.stringify({ uuid }));
      assets.push({ uuid, url: `db://assets/textures/tex${i}.png`, type: 'cc.Texture2D' });
    }

    const mockListAssets = async () => assets;

    const result = await findUnusedAssets(tmpDir, { limit: 3 }, mockListAssets);
    assert.equal(result.totalScanned, 5);
    assert.equal(result.unusedCount, 5);
    assert.equal(result.unused.length, 3);
  } finally {
    fs.rmSync(tmpDir, { recursive: true, force: true });
  }
});

test('collectUuidReferences is re-exported and works', () => {
  const refs = collectUuidReferences(JSON.stringify({
    __uuid__: 'abc12345-def6-7890-abcd-ef1234567890',
  }));
  assert.ok(refs.some((r) => r.uuid === 'abc12345-def6-7890-abcd-ef1234567890'));
});