using MediatR;
using TakeoutSaaS.Application.Identity.Commands;
using TakeoutSaaS.Application.Identity.Contracts;
using TakeoutSaaS.Domain.Identity.Entities;
using TakeoutSaaS.Domain.Identity.Repositories;
using TakeoutSaaS.Shared.Abstractions.Tenancy;

namespace TakeoutSaaS.Application.Identity.Handlers;

/// <summary>
/// 创建权限处理器。
/// </summary>
public sealed class CreatePermissionCommandHandler(
    IPermissionRepository permissionRepository,
    ITenantProvider tenantProvider)
    : IRequestHandler<CreatePermissionCommand, PermissionDto>
{
    public async Task<PermissionDto> Handle(CreatePermissionCommand request, CancellationToken cancellationToken)
    {
        // 1. 获取租户上下文
        var tenantId = tenantProvider.GetCurrentTenantId();

        // 2. 构建权限实体
        var permission = new Permission
        {
            TenantId = tenantId,
            Name = request.Name,
            Code = request.Code,
            Description = request.Description
        };

        // 3. 持久化
        await permissionRepository.AddAsync(permission, cancellationToken);
        await permissionRepository.SaveChangesAsync(cancellationToken);

        // 4. 返回 DTO
        return new PermissionDto
        {
            Id = permission.Id,
            TenantId = permission.TenantId,
            Name = permission.Name,
            Code = permission.Code,
            Description = permission.Description
        };
    }
}