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

const PROJECT_SRC = path.join(__dirname, '..', 'wwjcloud', 'src', 'common');
const CONTRACT_FILE = path.join(__dirname, 'contracts', 'routes.json');

function toCamelCase(input) {
  return input.replace(/[-_]+([a-zA-Z0-9])/g, (_, c) => c.toUpperCase());
}

function toPascalCase(input) {
  const camel = toCamelCase(input);
  return camel.charAt(0).toUpperCase() + camel.slice(1);
}

function ensureDir(dir) {
  if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
}

function buildMethodName(method, relPath) {
  const cleaned = relPath.replace(/:\w+/g, '').replace(/\/$/, '');
  const parts = cleaned.split('/').filter(Boolean);
  const base = parts.length ? parts.join('_') : 'root';
  return method.toLowerCase() + toPascalCase(base);
}

function controllerTemplate(prefix, className, routes) {
  const imports = "import { Controller, Get, Post, Put, Delete, Body, Param, Query, UseGuards } from '@nestjs/common';\n" +
    "import { ApiOperation, ApiTags } from '@nestjs/swagger';\n" +
    "import { AdminCheckTokenGuard } from '../../../../core/security/adminCheckToken.guard';\n" +
    "import { SiteScopeGuard } from '../../../../core/security/siteScopeGuard';\n\n";
  const header = `@ApiTags('${prefix}')\n@UseGuards(AdminCheckTokenGuard, SiteScopeGuard)\n@Controller('adminapi/${prefix}')\nexport class ${className} {`;
  const methods = routes.map(r => {
    const decorator = `@${r.method.charAt(0) + r.method.slice(1).toLowerCase()}('${r.rel}')`;
    const summary = `@ApiOperation({ summary: '${r.method} ${r.rel}' })`;
    const methodName = buildMethodName(r.method, r.rel);
    return `  ${decorator}\n  ${summary}\n  ${methodName}() {\n    return { success: true };\n  }`;
  }).join('\n\n');
  return imports + header + '\n' + methods + '\n}\n';
}

function main() {
  const contract = JSON.parse(fs.readFileSync(CONTRACT_FILE, 'utf8'));
  // group by first segment after adminapi/
  const groups = new Map();
  for (const r of contract) {
    if (!r.path.startsWith('adminapi/')) continue;
    const rest = r.path.slice('adminapi/'.length);
    const [prefix, ...restParts] = rest.split('/');
    const rel = restParts.join('/');
    const arr = groups.get(prefix) || [];
    arr.push({ method: r.method, rel });
    groups.set(prefix, arr);
  }
  for (const [prefix, routes] of groups) {
    const moduleDir = path.join(PROJECT_SRC, prefix);
    const ctrlDir = path.join(moduleDir, 'controllers', 'adminapi');
    ensureDir(ctrlDir);
    const fileName = `${toCamelCase(prefix)}.controller.ts`;
    const filePath = path.join(ctrlDir, fileName);
    if (fs.existsSync(filePath)) {
      // do not overwrite; skip existing controllers
      continue;
    }
    const className = `${toPascalCase(prefix)}Controller`;
    const content = controllerTemplate(prefix, className, routes);
    fs.writeFileSync(filePath, content);
    console.log('Generated', filePath);
  }
}

main();