/**
 * Used to parse the .env.development proxy configuration
 */
import type { ProxyOptions } from 'vite';

type ProxyItem = [string, string];

type ProxyList = ProxyItem[];

type ProxyTargetList = Record<string, ProxyOptions>;

const httpsRE = /^https:\/\//;

/**
 * Generate proxy
 * @param list
 */
export function createProxy(list: ProxyList = []) {
  const ret: ProxyTargetList = {};
  for (const [prefix, target] of list) {
    const isHttps = httpsRE.test(target);

    // 若 target 带路径（如 http://localhost:8080/jeecg-boot），需拼回转发路径：
    // 否则 rewrite 去掉 /jeecgboot 后只剩 /xslmes/...，缺少 context-path，后端会报 No static resource。
    let proxyTarget = target;
    let targetPathPrefix = '';
    try {
      const u = new URL(target);
      const p = (u.pathname || '').replace(/\/$/, '');
      if (p) {
        targetPathPrefix = p;
        proxyTarget = `${u.protocol}//${u.host}`;
      }
    } catch {
      /* 非标准 URL 时保持原 target */
    }

    // https://github.com/http-party/node-http-proxy#options
    ret[prefix] = {
      target: proxyTarget,
      changeOrigin: true,
      ws: true,
      rewrite: (path) => {
        const stripped = path.replace(new RegExp(`^${prefix}`), '');
        return targetPathPrefix ? `${targetPathPrefix}${stripped}` : stripped;
      },
      // https is require secure=false
      ...(isHttps ? { secure: false } : {}),
    };
  }
  return ret;
}