import {
  CanActivate,
  ExecutionContext,
  Injectable,
  UnauthorizedException,
} from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';
import { Request } from 'express';
import { AdminUserRecord } from '../interfaces/admin-records.interface';
import { AdminService } from '../admin.service';

@Injectable()
export class AdminJwtAuthGuard implements CanActivate {
  constructor(
    private readonly jwtService: JwtService,
    private readonly adminService: AdminService,
  ) {}

  async canActivate(context: ExecutionContext): Promise<boolean> {
    const request = context
      .switchToHttp()
      .getRequest<Request & { adminUser?: AdminUserRecord; adminId?: number }>();
    const authHeader = request.get('authorization');
    const token = authHeader?.startsWith('Bearer ')
      ? authHeader.slice('Bearer '.length)
      : undefined;

    if (!token) {
      throw new UnauthorizedException('Admin not authenticated');
    }

    try {
      const payload = await this.jwtService.verifyAsync<{
        sub: number;
        type: string;
      }>(token);
      if (payload.type !== 'admin') {
        throw new UnauthorizedException('Admin not authenticated');
      }

      const adminUser = await this.adminService.findAdminById(payload.sub);
      if (!adminUser || adminUser.status !== 'active') {
        throw new UnauthorizedException('Admin not authenticated');
      }

      request.adminUser = adminUser;
      request.adminId = adminUser.id;
      return true;
    } catch {
      throw new UnauthorizedException('Admin not authenticated');
    }
  }
}