package logic

import (
	"context"
	"strings"

	"godemo/category/category"
	"godemo/gateway/internal/svc"
	"godemo/gateway/internal/types"

	"github.com/zeromicro/go-zero/core/logx"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

type CreateCategoryLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewCreateCategoryLogic(ctx context.Context, svcCtx *svc.ServiceContext) *CreateCategoryLogic {
	return &CreateCategoryLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *CreateCategoryLogic) CreateCategory(req *types.CreateCategoryReq) (resp *types.CreateCategoryResp, err error) {
	// 1. 参数验证
	if err := validateCreateRequest(req); err != nil {
		return nil, err
	}

	// 2. 准备 RPC 请求
	rpcReq := &category.CreateCategoryRequest{
		SystemId:    req.SystemID,
		Name:        req.Name,
		Description: req.Description,
	}

	// 可选参数处理
	if req.Alias != "" {
		rpcReq.Alias = req.Alias
	}

	if req.ParentID != "" {
		rpcReq.ParentId = req.ParentID
	}

	// 3. 调用 RPC 服务
	rpcResp, rpcErr := l.svcCtx.CategoryRpc.CreateCategory(l.ctx, rpcReq)
	if rpcErr != nil {
		return nil, rpcErr
	}

	// 4. 构建响应
	resp = &types.CreateCategoryResp{
		ID: rpcResp.Category.Id,
	}

	l.Logger.Infof("Category created successfully: ID=%s, Name=%s", resp.ID, req.Name)
	return resp, nil
}

// validateCreateRequest 验证创建分类请求
func validateCreateRequest(req *types.CreateCategoryReq) error {
	// 必需字段检查
	if strings.TrimSpace(req.SystemID) == "" {
		return status.Error(codes.InvalidArgument, "systemId不能为空")
	}
	if strings.TrimSpace(req.Name) == "" {
		return status.Error(codes.InvalidArgument, "name不能为空")
	}

	// 名称长度限制
	if len(req.Name) > 50 {
		return status.Error(codes.InvalidArgument, "alias cannot exceed 50 characters")
	}

	// 别名格式验证 (只允许字母、数字、连字符和下划线)
	// if req.Alias != "" {
	// 	if len(req.Alias) > 50 {
	// 		return errors.New("alias cannot exceed 50 characters")
	// 	}
	// 	for _, ch := range req.Alias {
	// 		if !(ch >= 'a' && ch <= 'z') &&
	// 			!(ch >= 'A' && ch <= 'Z') &&
	// 			!(ch >= '0' && ch <= '9') &&
	// 			ch != '-' && ch != '_' {
	// 			return errors.New("alias can only contain letters, numbers, hyphens and underscores")
	// 		}
	// 	}
	// }

	// 描述长度限制
	if len(req.Description) > 500 {
		return status.Error(codes.InvalidArgument, "description cannot exceed 500 characters")
	}

	return nil
}