import { defineConfig, LibraryFormats } from 'vite';
import { env, cwd } from 'node:process';
import { resolve } from 'node:path';
import { readFile } from 'node:fs/promises';
import react from '@vitejs/plugin-react';

interface Options {
  name: string;
  entry?: string;
  defaultFormats?: LibraryFormats[];
  externalDeps?: boolean;
}

const resolvePath = (path: string) => resolve(cwd(), path);
const isProduction = !!env['PROD'];

export default async ({
  name,
  entry = 'src/index.ts',
  defaultFormats = ['es'],
  externalDeps = true,
}: Options) => {
  const formats = (env['FORMATS']?.split(',') ?? defaultFormats) as LibraryFormats[];

  let externals: string[] = [];

  if (externalDeps) {
    const { peerDependencies = {}, devDependencies = {} } = await getPackageJson(
      resolvePath('package.json'),
    );
    externals = [...Object.keys(peerDependencies), ...Object.keys(devDependencies)];
  }

  return defineConfig({
    build: {
      lib: {
        entry: resolvePath(entry),
        name,
        fileName: camelCaseToKebabCase(name),
        formats,
      },
      minify: isProduction,
      sourcemap: isProduction ? false : 'inline',
      rollupOptions: {
        external: externals,
      },
    },
    plugins: [react()],
  });
};

function camelCaseToKebabCase(str: string) {
  // 使用正则表达式匹配大写字母
  return str.replace(/([a-z0-9])([A-Z])/g, '$1-$2').toLowerCase();
}

async function getPackageJson(path: string) {
  const content = await readFile(path, 'utf-8');
  return JSON.parse(content);
}