const esbuild = require('esbuild');
const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');

const isWatch = process.argv.includes('--watch');

const commonOptions = {
  entryPoints: [path.resolve(__dirname, '../src/index.ts')],
  bundle: true,
  minify: true,
  sourcemap: false,
  target: ['es2018'],
  logLevel: 'info',
};

// 生成 TypeScript 声明文件
function generateDeclarations() {
  console.log('Generating TypeScript declarations...');
  
  const tmpDir = path.resolve(__dirname, '../dist-tmp');
  
  try {
    // 清理临时目录
    if (fs.existsSync(tmpDir)) {
      fs.rmSync(tmpDir, { recursive: true, force: true });
    }
    fs.mkdirSync(tmpDir, { recursive: true });
    
    // 生成所有 .d.ts 到临时目录（宽松模式，忽略错误）
    execSync(
      `tsc --skipLibCheck --declaration --declarationDir ${tmpDir} --outDir ${tmpDir} --strict false --noImplicitAny false --strictNullChecks false --noEmitOnError false --emitDeclarationOnly`,
      {
        cwd: path.resolve(__dirname, '..'),
        stdio: 'pipe',
      }
    );
  } catch (e) {
    // 忽略 tsc 错误
  }
  
  // 只复制 .d.ts 文件到 dist，删除多余的 .js
  copyDtsFiles(tmpDir, path.resolve(__dirname, '../dist'));
  
  // 清理临时目录
  if (fs.existsSync(tmpDir)) {
    fs.rmSync(tmpDir, { recursive: true, force: true });
  }
  
  console.log('Declarations generated.');
}

// 递归复制 .d.ts 文件
function copyDtsFiles(srcDir, destDir) {
  if (!fs.existsSync(destDir)) {
    fs.mkdirSync(destDir, { recursive: true });
  }
  
  const files = fs.readdirSync(srcDir);
  for (const file of files) {
    const srcPath = path.join(srcDir, file);
    const stat = fs.statSync(srcPath);
    
    if (stat.isDirectory()) {
      copyDtsFiles(srcPath, path.join(destDir, file));
    } else if (file.endsWith('.d.ts')) {
      fs.copyFileSync(srcPath, path.join(destDir, file));
    }
  }
}

async function build() {
  const distDir = path.resolve(__dirname, '../dist');
  
  // 清理 dist 目录
  if (fs.existsSync(distDir)) {
    fs.rmSync(distDir, { recursive: true, force: true });
  }
  fs.mkdirSync(distDir, { recursive: true });

  const outputs = [
    {
      format: 'iife',
      outfile: path.resolve(__dirname, '../dist/index.iife.js'),
      globalName: 'LightSDK',
    },
    {
      format: 'esm',
      outfile: path.resolve(__dirname, '../dist/index.esm.js'),
    },
    {
      format: 'cjs',
      outfile: path.resolve(__dirname, '../dist/index.cjs.js'),
    },
  ];

  for (const output of outputs) {
    await esbuild.build({
      ...commonOptions,
      format: output.format,
      outfile: output.outfile,
      globalName: output.globalName,
    });
  }

  // 生成声明文件
  generateDeclarations();

  console.log('Build complete!');
}

if (isWatch) {
  console.log('Watching for changes...');
  const ctx = esbuild.context({
    ...commonOptions,
    format: 'esm',
    outfile: path.resolve(__dirname, '../dist/index.esm.js'),
  });
  ctx.watch();
} else {
  build().catch((e) => {
    console.error(e);
    process.exit(1);
  });
}