import { Logger, ValidationPipe } from '@nestjs/common';
import { NestFactory } from '@nestjs/core';
import { NestExpressApplication } from '@nestjs/platform-express';
import { existsSync, mkdirSync } from 'node:fs';
import { resolve } from 'node:path';
import { AppModule } from './app.module';
import { AppConfig, configuration, validateEnv } from './config/configuration';

async function bootstrap(): Promise<void> {
  const logger = new Logger('Bootstrap');

  // 启动前校验环境变量（生产环境禁止 DB_SYNCHRONIZE=true 等）
  const problems = validateEnv(configuration());
  if (problems.length > 0) {
    for (const problem of problems) logger.warn(`环境变量问题：${problem}`);
    if ((process.env.NODE_ENV ?? 'development') === 'production') {
      logger.error('生产环境配置校验失败，启动中止');
      process.exit(1);
    }
  }

  const app = await NestFactory.create<NestExpressApplication>(AppModule, {
    logger: ['error', 'warn', 'log'],
  });

  const config = app.get(AppConfig);

  app.useGlobalPipes(
    new ValidationPipe({
      transform: true,
      whitelist: true,
      forbidNonWhitelisted: false,
      transformOptions: { enableImplicitConversion: false },
    }),
  );

  // Windows 客户端与管理端跨源访问
  app.enableCors({
    origin: true,
    credentials: false,
    exposedHeaders: ['Content-Disposition'],
  });

  // 上传文件静态访问：/static/<kind>/<yyyy>/<mm>/<sha256>.<ext>
  const storageDir = resolve(config.storageDir);
  if (!existsSync(storageDir)) mkdirSync(storageDir, { recursive: true });
  app.useStaticAssets(storageDir, { prefix: '/static/', index: false, fallthrough: true });

  // 契约快照静态访问（若存在）：/contracts/rest-api.yaml 等
  if (config.contractsDir && existsSync(config.contractsDir)) {
    app.useStaticAssets(resolve(config.contractsDir), { prefix: '/contracts/', index: false });
  }

  app.enableShutdownHooks();

  const db = config.db;
  await app.listen(config.port, config.bindHost);

  logger.log(`OpenDance Studio Web 服务端已启动：http://${config.bindHost}:${config.port}`);
  logger.log(`健康检查：http://${config.bindHost}:${config.port}/health`);
  logger.log(`数据库：${db.host}:${db.port}/${db.name}（现有实例，本服务不管理 MySQL）`);
  logger.log(`文件存储：${storageDir}`);
  logger.log(`契约版本：${JSON.stringify(config.contractVersions)}`);
}

void bootstrap().catch((error) => {
  // eslint-disable-next-line no-console
  console.error('服务启动失败：', error);
  process.exit(1);
});