import { Middleware, IMiddleware } from '@midwayjs/core';
import { Context, NextFunction } from '@midwayjs/koa';
import { Provide, Inject } from '@midwayjs/core';
import { InjectRepository } from '@midwayjs/sequelize';
import SysOperationLog from '../entity/sysOperationLog.entity';

@Provide()
export class LogMiddleware implements IMiddleware<Context, NextFunction> {
  // 中间件匹配范围：全局生效，跳过日志查询、健康检查、登录（登录由内部记录）与文件上传（multipart 无记录价值）
  ignore = ['/api/logs/*', '/api/health', '/api/auth/login', '/api/upload/*'];

  @InjectRepository(SysOperationLog)
  logModel!: typeof SysOperationLog;

  resolve() {
    return async (ctx: Context, next: NextFunction) => {
      await next();

      // 仅记录写操作，且要求登录用户存在
      if (!['POST', 'PUT', 'DELETE'].includes(ctx.method)) {
        return;
      }

      if (!ctx.state.user) {
        return;
      }

      const logData = {
        userId: ctx.state.user.userId,
        module: this.getModuleFromUrl(ctx.url),
        action: this.getActionDescription(ctx),
        method: ctx.method,
        params: JSON.stringify(ctx.request.body || {}),
        ip: ctx.ip,
      };

      this.saveLog(logData).catch(err => {
        console.error('保存操作日志失败:', err);
      });
    };
  }

  private getActionDescription(ctx: Context): string {
    const actionMap: Record<string, Record<string, string>> = {
      '/api/auth/login': { POST: '用户登录' },
      '/api/auth/logout': { POST: '用户登出' },
      '/api/users': {
        POST: '创建用户',
        PUT: '更新用户',
        DELETE: '删除用户',
      },
      '/api/roles': {
        POST: '创建角色',
        PUT: '更新角色',
        DELETE: '删除角色',
      },
      '/api/menus': {
        POST: '创建菜单',
        PUT: '更新菜单',
        DELETE: '删除菜单',
      },
      '/api/dicts': {
        POST: '创建字典',
        PUT: '更新字典',
        DELETE: '删除字典',
      },
    };

    const basePath = ctx.url.split('?')[0];

    if (actionMap[basePath]?.[ctx.method]) {
      return actionMap[basePath][ctx.method];
    }

    for (const [path, actions] of Object.entries(actionMap)) {
      if (basePath.startsWith(path) && actions[ctx.method]) {
        return actions[ctx.method];
      }
    }

    return `${ctx.method} ${basePath}`;
  }

  private getModuleFromUrl(url: string): string {
    const moduleMap: Record<string, string> = {
      '/api/auth': '认证',
      '/api/users': '用户管理',
      '/api/roles': '角色管理',
      '/api/menus': '菜单管理',
      '/api/dicts': '数据字典',
      '/api/logs': '日志管理',
      '/api/dashboard': '仪表盘',
    };

    for (const [path, module] of Object.entries(moduleMap)) {
      if (url.startsWith(path)) {
        return module;
      }
    }

    return '其他';
  }

  private async saveLog(logData: any): Promise<void> {
    try {
      await this.logModel.create(logData);
    } catch (error) {
      console.error('写入操作日志失败:', error);
    }
  }
}