import { CanActivate, ExecutionContext, ForbiddenException, Injectable } from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { Request } from 'express';
import {
  REQUIRED_PERMISSIONS_METADATA,
} from '../decorators/require-permissions.decorator';
import { AdminUserRecord } from '../interfaces/admin-records.interface';
import { AdminService } from '../admin.service';

@Injectable()
export class PermissionsGuard implements CanActivate {
  constructor(
    private readonly reflector: Reflector,
    private readonly adminService: AdminService,
  ) {}

  async canActivate(context: ExecutionContext): Promise<boolean> {
    const required =
      this.reflector.getAllAndOverride<string[]>(
        REQUIRED_PERMISSIONS_METADATA,
        [context.getHandler(), context.getClass()],
      ) ?? [];

    if (required.length === 0) {
      return true;
    }

    const request = context
      .switchToHttp()
      .getRequest<Request & { adminUser?: AdminUserRecord }>();
    const adminUser = request.adminUser;

    if (!adminUser) {
      throw new ForbiddenException('No permission');
    }

    if (adminUser.isSuperAdmin) {
      return true;
    }

    const permissions = await this.adminService.getPermissionCodesForAdmin(
      adminUser.id,
    );
    const allowed = required.every((permission) =>
      permissions.includes(permission),
    );

    if (!allowed) {
      throw new ForbiddenException('No permission');
    }

    return true;
  }
}