#!/usr/bin/env node

/**
 * API 文档自动生成脚本
 * 从后端 Swagger 自动生成前端文档
 */

const fs = require('fs');
const path = require('path');
const axios = require('axios');

// 配置
const config = {
  backendUrl: process.env.BACKEND_URL || 'http://localhost:3000',
  docsDir: path.join(__dirname, '../src/wwjcloud/openapi/api'),
  apiGroups: {
    unified: {
      name: '统一 API',
      swaggerPath: '/docs-json',
      outputDir: 'unified',
      prefix: ''
    }
  }
};

/**
 * 获取 Swagger JSON
 */
async function getSwaggerJson(group) {
  try {
    const url = `${config.backendUrl}${group.swaggerPath}`;
    console.log(`获取 ${group.name} API: ${url}`);
    const response = await axios.get(url);
    return response.data;
  } catch (error) {
    console.error(`获取失败: ${error.message}`);
    return null;
  }
}

/**
 * 生成模块文档
 */
function generateModuleDoc(group, tag, paths) {
  const moduleName = tag.name;
  let markdown = `---
title: ${moduleName} API
description: ${tag.description || `${moduleName} 相关接口`}
---

# ${moduleName} API

::: info ${moduleName}

${tag.description || `${moduleName} 相关接口`}

:::

## API 列表

`;

  // 查找该标签下的接口
  Object.keys(paths).forEach(path => {
    Object.keys(paths[path]).forEach(method => {
      const operation = paths[path][method];
      if (operation.tags && operation.tags.includes(tag.name)) {
        markdown += generateApiDoc(path, method, operation);
      }
    });
  });

  return markdown;
}

/**
 * 生成单个 API 文档
 */
function generateApiDoc(path, method, operation) {
  const summary = operation.summary || operation.operationId || '未命名接口';
  
  let doc = `### ${summary}\n\n`;
  doc += `**接口**: \`${method.toUpperCase()} ${path}\`\n\n`;
  
  if (operation.description) {
    doc += `**描述**: ${operation.description}\n\n`;
  }

  // 请求参数
  if (operation.parameters && operation.parameters.length > 0) {
    doc += `**参数**:\n\n`;
    doc += `| 参数 | 类型 | 必填 | 说明 |\n`;
    doc += `|------|------|------|------|\n`;
    
    operation.parameters.forEach(param => {
      const required = param.required ? '是' : '否';
      const type = param.type || param.schema?.type || 'string';
      doc += `| ${param.name} | ${type} | ${required} | ${param.description || ''} |\n`;
    });
    doc += `\n`;
  }

  // 请求体
  if (operation.requestBody) {
    doc += `**请求体**:\n\n`;
    doc += `\`\`\`json\n`;
    doc += `{\n`;
    doc += `  // 请求数据\n`;
    doc += `}\n`;
    doc += `\`\`\`\n\n`;
  }

  // 响应
  doc += `**响应**:\n\n`;
  doc += `\`\`\`json\n`;
  doc += `{\n`;
  doc += `  "code": 200,\n`;
  doc += `  "message": "success",\n`;
  doc += `  "data": {\n`;
  doc += `    // 响应数据\n`;
  doc += `  }\n`;
  doc += `}\n`;
  doc += `\`\`\`\n\n`;
  doc += `---\n\n`;

  return doc;
}

/**
 * 保存文档
 */
function saveDocument(outputPath, content) {
  try {
    const dir = path.dirname(outputPath);
    if (!fs.existsSync(dir)) {
      fs.mkdirSync(dir, { recursive: true });
    }
    fs.writeFileSync(outputPath, content, 'utf8');
    console.log(`已保存: ${outputPath}`);
  } catch (error) {
    console.error(`保存失败: ${error.message}`);
  }
}

/**
 * 主函数
 */
async function main() {
  console.log('开始自动生成 API 文档...\n');

  for (const [key, group] of Object.entries(config.apiGroups)) {
    console.log(`处理 ${group.name}...`);
    
    const swaggerData = await getSwaggerJson(group);
    if (!swaggerData) {
      console.log(`跳过 ${group.name}\n`);
      continue;
    }

    const tags = swaggerData.tags || [];
    const paths = swaggerData.paths || {};

    // 为每个标签生成文档
    for (const tag of tags) {
      const moduleName = tag.name.toLowerCase().replace(/\s+/g, '-');
      const content = generateModuleDoc(group, tag, paths);
      const outputPath = path.join(config.docsDir, group.outputDir, `${moduleName}.md`);
      saveDocument(outputPath, content);
    }

    console.log(`${group.name} 完成\n`);
  }

  console.log('API 文档生成完成！');
  console.log('访问: http://localhost:6173/wwjcloud/openapi/api/');
}

// 运行
if (require.main === module) {
  main().catch(error => {
    console.error('执行失败:', error);
    process.exit(1);
  });
}

module.exports = { config, getSwaggerJson, generateModuleDoc };