/**
 * Getting plugin info in child_process to prevent effecting egg application( splitting scopes ).
 */

import fs from 'node:fs';
import path from 'node:path';
import { execFileSync } from 'node:child_process';
import { pathToFileURL } from 'node:url';

import { eggInfoPath } from '../config';
import * as utils from '../utils';

const cwd = process.cwd();
const eggInfo: utils.EggInfoResult = {};
const startTime = Date.now();

if (utils.checkMaybeIsTsProj(cwd)) {
  // only require ts-node in ts project
  const tsconfigPath = path.resolve(cwd, './tsconfig.json');
  if (fs.existsSync(tsconfigPath)) {
    require('ts-node').register(utils.readJson5(tsconfigPath));
  } else {
    require('ts-node/register');
  }
}

async function main() {
  const pkg = utils.getPkgInfo(cwd);
  // try to read postinstall script env.ETS_SCRIPT_FRAMEWORK, let egg-bin can auto set the default framework
  const framework = (pkg.egg || {}).framework || process.env.ETS_SCRIPT_FRAMEWORK || 'egg';
  if (pkg.type === 'module') {
    const saveEggInfoPath = path.join(__dirname, '../../save_egg_info.mjs');
    console.warn('[egg-ts-helper] use esm script to save egg info, %o', saveEggInfoPath);
    const frameworkPath = getFrameworkPath(cwd, framework);
    const esmLoader = pathToFileURL(require.resolve('ts-node/esm')).href;
    execFileSync(process.execPath, [ '--no-warnings', '--loader', esmLoader, saveEggInfoPath, cwd, frameworkPath, eggInfoPath ], {
      env: {
        ...process.env,
        EGG_TS_ENABLE: 'true',
        VITEST: 'true',
      },
    });
    return;
  }
  const loader = getLoader(cwd, framework);
  if (loader) {
    try {
      await loader.loadPlugin();
    } catch (e) {
      console.warn('[egg-ts-helper] WARN loader.loadPlugin() error: %s, cwd: %s, framework: %s',
        e, cwd, framework);
      // do nothing
    }

    // hack loadFile, ignore config file without customLoader for faster booting
    mockFn(loader, 'loadFile', (filepath: string) => {
      if (filepath && filepath.substring(filepath.lastIndexOf(path.sep) + 1).startsWith('config.')) {
        const fileContent = fs.readFileSync(filepath, 'utf-8');
        if (!fileContent.includes('customLoader')) return;
      }
      return true;
    });

    try {
      await loader.loadConfig();
    } catch (e) {
      console.warn('[egg-ts-helper] WARN loader.loadConfig() error: %s, cwd: %s, framework: %s',
        e, cwd, framework);
      // do nothing
    }

    eggInfo.plugins = loader.allPlugins;
    eggInfo.config = loader.config;
    eggInfo.eggPaths = loader.eggPaths;
    eggInfo.timing = Date.now() - startTime;
  }

  utils.writeFileSync(eggInfoPath, JSON.stringify(eggInfo));
}

/* istanbul ignore next */
function noop() {}

function mockFn(obj, name, fn) {
  const oldFn = obj[name];
  obj[name] = (...args) => {
    const result = fn.apply(obj, args);
    if (result) return oldFn.apply(obj, args);
  };
}

function getFrameworkPath(baseDir: string, framework: string) {
  let frameworkPath = '';
  try {
    frameworkPath = require.resolve(`${framework}/package.json`, { paths: [ baseDir ] });
    frameworkPath = path.dirname(frameworkPath);
  } catch {
    // ignore error
  }
  if (!frameworkPath) {
    frameworkPath = path.join(baseDir, 'node_modules', framework);
  }
  return frameworkPath;
}

function getLoader(baseDir: string, framework: string) {
  const frameworkPath = getFrameworkPath(baseDir, framework);
  const eggCore = findEggCore(baseDir, frameworkPath);
  if (!eggCore) {
    console.warn('[egg-ts-helper] WARN cannot find @eggjs/core from frameworkPath: %s', frameworkPath);
    return;
  }
  const EggLoader = eggCore.EggLoader;
  const egg = utils.requireFile(frameworkPath) || utils.requireFile(framework);
  if (!egg || !egg.Application || !EggLoader) return;
  process.env.EGG_SERVER_ENV = 'local';
  return new EggLoader({
    baseDir,
    logger: {
      debug: noop,
      info: noop,
      warn: noop,
      error: noop,
    },
    app: Object.create(egg.Application.prototype),
  });
}

function findEggCore(baseDir: string, frameworkPath: string, eggCorePkgName = '@eggjs/core') {
  let eggCorePath = '';
  try {
    eggCorePath = require.resolve(eggCorePkgName, { paths: [ frameworkPath ] });
  } catch {
    // ignore error
  }
  if (!eggCorePath) {
    eggCorePath = path.join(baseDir, 'node_modules', eggCorePkgName);
    if (!fs.existsSync(eggCorePath)) {
      eggCorePath = path.join(frameworkPath, 'node_modules', eggCorePkgName);
    }
  }
  // try to load egg-core in cwd
  const eggCore = utils.requireFile(eggCorePath);
  if (!eggCore) {
    // try to resolve egg-core
    return utils.requireFile(eggCorePkgName);
  }
  return eggCore;
}

main();