/**
 * 从 swagger.json 生成带参数的 API 接口清单 MD 文档
 * 用法: node _docs/_gen_api_doc.js
 */
const fs = require("fs");
const path = require("path");

const swagger = require("./swagger.json");
const mdRaw = fs.readFileSync(path.join(__dirname, "接口说明文档-完整版-含营销等级.md"), "utf8");

// ========== 1. 解析套餐映射 ==========
const planMap = {};
let curPath = "";
for (const line of mdRaw.split("\n")) {
  const m = line.match(/####.*`(POST|GET)\s+(.+?)`/);
  if (m) { curPath = m[2].trim(); continue; }
  const p = line.match(/对应套餐：\*\*(.+?)\*\*/);
  if (p && curPath) { planMap[curPath] = p[1]; curPath = ""; }
}

// ========== 2. 解析 definitions ==========
function resolveRef(ref) {
  if (!ref) return null;
  const name = ref.replace("#/definitions/", "");
  return swagger.definitions[name] || null;
}

function resolveType(prop) {
  if (!prop) return "any";
  if (prop.$ref) {
    const name = prop.$ref.replace("#/definitions/", "");
    return name;
  }
  if (prop.type === "array") {
    if (prop.items) {
      if (prop.items.$ref) return resolveType(prop.items) + "[]";
      return (prop.items.type || "any") + "[]";
    }
    return "array";
  }
  let t = prop.type || "any";
  if (prop.format) t += `(${prop.format})`;
  return t;
}

function getModelFields(def) {
  if (!def || !def.properties) return [];
  const fields = [];
  for (const [name, prop] of Object.entries(def.properties)) {
    fields.push({
      name,
      type: resolveType(prop),
      desc: (prop.description || "").trim() || "-",
    });
  }
  return fields;
}

// ========== 3. 按 tag 分组 ==========
const tagNameMap = { "朋友": "好友", "/shop": "微信小店", "管理": "管理/授权" };
function normTag(t) { return tagNameMap[t] || t; }

const tagOrder = [
  "登录", "用户", "好友", "标签", "消息", "消息回调",
  "群管理", "朋友圈", "收藏", "支付", "公众号/小程序",
  "企业微信", "视频号", "设备", "微信小店", "其他", "同步消息", "管理/授权",
];

const groups = {};
for (const [apiPath, methods] of Object.entries(swagger.paths)) {
  for (const [method, spec] of Object.entries(methods)) {
    const tag = (spec.tags && spec.tags[0]) || "未分类";
    if (!groups[tag]) groups[tag] = [];

    const params = spec.parameters || [];
    const queryParams = params.filter((p) => p.in === "query");
    const bodyParam = params.find((p) => p.in === "body");

    let bodyModelName = "";
    let bodyFields = [];
    if (bodyParam && bodyParam.schema && bodyParam.schema.$ref) {
      bodyModelName = bodyParam.schema.$ref.replace("#/definitions/", "");
      const def = resolveRef(bodyParam.schema.$ref);
      bodyFields = getModelFields(def);
    }

    groups[tag].push({
      method: method.toUpperCase(),
      path: apiPath,
      summary: spec.summary || "",
      plan: planMap[apiPath] || "-",
      queryParams,
      bodyModelName,
      bodyFields,
    });
  }
}

const sortedTags = Object.keys(groups).sort((a, b) => {
  const ia = tagOrder.indexOf(normTag(a));
  const ib = tagOrder.indexOf(normTag(b));
  return (ia === -1 ? 99 : ia) - (ib === -1 ? 99 : ib);
});

// ========== 4. 生成 MD ==========
const totalApis = Object.values(groups).reduce((s, a) => s + a.length, 0);
const planCount = {};
for (const apis of Object.values(groups)) {
  for (const a of apis) {
    planCount[a.plan] = (planCount[a.plan] || 0) + 1;
  }
}

let out = "# API 接口清单（按模块）\n\n";
out += `> 接口总数：**${totalApis}**\n\n`;

out += "## 套餐统计\n\n";
out += "| 套餐 | 接口数 |\n|---|---:|\n";
for (const p of ["初级版", "高级版", "定制版", "白标/OEM"]) {
  if (planCount[p]) out += `| ${p} | ${planCount[p]} |\n`;
}
out += "\n---\n\n";

let secIdx = 0;
for (const tag of sortedTags) {
  const apis = groups[tag];
  secIdx++;
  const displayTag = normTag(tag);
  out += `## ${secIdx}. ${displayTag}（${apis.length} 个接口）\n\n`;

  apis.forEach((a, i) => {
    const num = `${secIdx}.${i + 1}`;
    out += `### ${num} \`${a.method} ${a.path}\` - ${a.summary}\n\n`;
    out += `- 套餐：**${a.plan}**\n\n`;

    // Query 参数
    if (a.queryParams.length > 0) {
      out += "**Query 参数**\n\n";
      out += "| 参数名 | 类型 | 说明 |\n|---|---|---|\n";
      for (const q of a.queryParams) {
        out += `| \`${q.name}\` | ${q.type || "string"} | ${q.description || "-"} |\n`;
      }
      out += "\n";
    }

    // Body 请求体
    if (a.bodyFields.length > 0) {
      out += `**请求体 (${a.bodyModelName})**\n\n`;
      out += "| 字段名 | 类型 | 说明 |\n|---|---|---|\n";
      for (const f of a.bodyFields) {
        out += `| \`${f.name}\` | \`${f.type}\` | ${f.desc} |\n`;
      }
      out += "\n";
    }

    out += "---\n\n";
  });
}

const outPath = path.join(__dirname, "API接口清单-按模块.md");
fs.writeFileSync(outPath, out, "utf8");
console.log(`done: ${outPath}, ${out.split("\n").length} lines`);