/**
 * AIA 智能问答模块 - 附件控制器
 * @module aia/controllers/attachmentController
 * 
 * API 端点：
 * - POST /api/v1/aia/conversations/:id/attachments  上传附件
 */

import type { FastifyRequest, FastifyReply } from 'fastify';
import { logger } from '../../../common/logging/index.js';
import * as attachmentService from '../services/attachmentService.js';

/**
 * 从 JWT Token 获取用户 ID
 */
function getUserId(request: FastifyRequest): string {
  const userId = (request as any).user?.userId;
  if (!userId) {
    throw new Error('User not authenticated');
  }
  return userId;
}

/**
 * 上传附件
 * POST /api/v1/aia/conversations/:id/attachments
 */
export async function uploadAttachment(
  request: FastifyRequest<{
    Params: { id: string };
  }>,
  reply: FastifyReply
) {
  try {
    const userId = getUserId(request);
    const { id: conversationId } = request.params;

    // 获取上传的文件
    const data = await request.file();
    
    if (!data) {
      return reply.status(400).send({
        code: -1,
        error: {
          code: 'VALIDATION_ERROR',
          message: '请上传文件',
        },
      });
    }

    const buffer = await data.toBuffer();

    logger.info('[AIA:AttachmentController] 上传附件', {
      userId,
      conversationId,
      filename: data.filename,
      mimetype: data.mimetype,
      size: buffer.length,
    });

    const attachment = await attachmentService.uploadAttachment(
      userId,
      conversationId,
      {
        filename: data.filename,
        mimetype: data.mimetype,
        buffer,
      }
    );

    return reply.send({
      code: 0,
      data: attachment,
    });
  } catch (error) {
    const errorMessage = error instanceof Error ? error.message : String(error);
    logger.error('[AIA:AttachmentController] 上传附件失败', { 
      error: errorMessage,
      stack: error instanceof Error ? error.stack : undefined,
    });
    
    return reply.status(500).send({
      code: -1,
      error: {
        code: 'INTERNAL_ERROR',
        message: errorMessage,
      },
    });
  }
}