/**
 * common.js — 商机模块接口验收公共工具
 *
 * 用法：在各 demo 页 <script src="../common.js"> 引入后直接调用：
 *   const token = await getToken();
 *   const res   = await apiFetch('GET', '/api/opportunity/123');
 *   renderResult('result', res);
 */

const BASE_URL   = 'http://localhost:8080';
const DEBUG_UID  = '739564171091247104';
const TOKEN_KEY  = 'verify_token';

/** 获取调试 token（优先读 sessionStorage 缓存，避免重复请求） */
async function getToken() {
  let t = sessionStorage.getItem(TOKEN_KEY);
  if (t) return t;
  const r = await fetch(`${BASE_URL}/api/auth/debug/token?userId=${DEBUG_UID}`);
  const j = await r.json();
  t = j.data;
  sessionStorage.setItem(TOKEN_KEY, t);
  return t;
}

/**
 * 发送带 token 的 HTTP 请求
 * @param {string} method  - GET / POST / PUT / DELETE
 * @param {string} path    - 以 /api/ 开头
 * @param {object} [body]  - JSON body（GET 时忽略）
 * @param {object} [query] - URL 查询参数 key-value
 * @returns {{ status, ok, data, raw, durationMs }}
 */
async function apiFetch(method, path, body, query) {
  const token = await getToken();
  let url = BASE_URL + path;
  if (query && Object.keys(query).length) {
    url += '?' + new URLSearchParams(query).toString();
  }
  const opts = {
    method,
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${token}`,
    },
  };
  if (body && method !== 'GET') {
    opts.body = JSON.stringify(body);
  }
  const t0 = Date.now();
  let raw, status, ok;
  try {
    const resp = await fetch(url, opts);
    status = resp.status;
    ok     = resp.ok;
    raw    = await resp.text();
  } catch (e) {
    return { status: 0, ok: false, data: null, raw: String(e), durationMs: Date.now() - t0 };
  }
  let data = null;
  try { data = JSON.parse(raw); } catch (_) { data = raw; }
  return { status, ok, data, raw, durationMs: Date.now() - t0 };
}

/**
 * 把结果渲染到页面上指定 id 的 <pre> 元素
 * @param {string} elementId
 * @param {{ status, ok, data, durationMs }} result
 */
function renderResult(elementId, result) {
  const el = document.getElementById(elementId);
  if (!el) return;
  const icon   = result.ok ? '✅' : (result.status === 0 ? '🔴' : '⚠️');
  const header = `${icon} HTTP ${result.status}  (${result.durationMs} ms)\n${'─'.repeat(50)}\n`;
  el.textContent = header + (
    typeof result.data === 'object'
      ? JSON.stringify(result.data, null, 2)
      : result.raw
  );
  el.style.color = result.ok ? '#1a7a1a' : '#b00020';
}

/**
 * 简单断言辅助（写入 <ul id="assertions"> 列表）
 * @param {string} label   - 断言说明
 * @param {boolean} pass
 * @param {string} [hint]  - 失败时显示的附加信息
 */
function assert(label, pass, hint) {
  const ul = document.getElementById('assertions');
  if (!ul) return;
  const li = document.createElement('li');
  li.style.color = pass ? '#1a7a1a' : '#b00020';
  li.textContent  = (pass ? '✅ ' : '❌ ') + label + (hint && !pass ? ` — ${hint}` : '');
  ul.appendChild(li);
}