package dict

import (
	consts "cid/consts/dict"
	"cid/dao/dict"
	dto "cid/model/dto/dict"
	entity "cid/model/entity/dict"
	"context"
	"errors"
	"fmt"
	"time"

	"gitea.com/red-future/common/beans"
)

type fieldMappingConfigService struct{}

// FieldMappingConfig 字段映射配置服务
var FieldMappingConfig = new(fieldMappingConfigService)

// Create 创建字段映射配置
func (s *fieldMappingConfigService) Create(ctx context.Context, req *dto.CreateFieldMappingConfigReq) (res *dto.CreateFieldMappingConfigRes, err error) {
	// 验证必填字段
	if err = s.validateRequiredFields(req); err != nil {
		return nil, err
	}

	// 检查重复配置
	exists, err := dict.FieldMappingConfig.CheckDuplicate(ctx, req.VendorName, req.ApiName, req.SourceField, req.TargetField, 0)
	if err != nil {
		return nil, errors.New("检查配置重复性失败")
	}
	if exists {
		return nil, errors.New("相同厂商、接口、源字段和目标字段的配置已存在")
	}

	// 验证转换参数
	if err = s.validateTransformParams(req.TransformType, req.TransformParams); err != nil {
		return nil, fmt.Errorf("转换参数验证失败: %v", err)
	}

	// 验证业务域
	if req.BusinessDomain != "" && !s.isValidBusinessDomain(req.BusinessDomain) {
		return nil, errors.New("无效的业务域")
	}

	// 验证生效时间和失效时间
	if req.EffectiveDate != nil && req.ExpiryDate != nil && req.EffectiveDate.After(*req.ExpiryDate) {
		return nil, errors.New("生效时间不能晚于失效时间")
	}

	// 插入数据库
	id, err := dict.FieldMappingConfig.Insert(ctx, req)
	if err != nil {
		return nil, errors.New("创建配置失败")
	}

	res = &dto.CreateFieldMappingConfigRes{
		Id: id,
	}
	return
}

// List 获取字段映射配置列表
func (s *fieldMappingConfigService) List(ctx context.Context, req *dto.ListFieldMappingConfigReq) (res *dto.ListFieldMappingConfigRes, err error) {
	configs, total, err := dict.FieldMappingConfig.List(ctx, req)
	if err != nil {
		return nil, errors.New("查询配置列表失败")
	}

	// 组装响应数据
	list := make([]dto.FieldMappingConfigItem, 0, len(configs))
	for _, item := range configs {
		list = append(list, dto.FieldMappingConfigItem{
			Id:                 item.Id,
			ConfigName:         item.ConfigName,
			VendorName:         item.VendorName,
			ApiName:            item.ApiName,
			ApiVersion:         item.ApiVersion,
			SourceField:        item.SourceField,
			TargetField:        item.TargetField,
			TargetFieldType:    item.TargetFieldType,
			TransformType:      item.TransformType,
			TransformTypeName:  s.getTransformTypeName(item.TransformType),
			IsActive:           item.IsActive,
			Priority:           item.Priority,
			BusinessDomain:     item.BusinessDomain,
			BusinessDomainName: s.getBusinessDomainName(item.BusinessDomain),
			FieldGroup:         item.FieldGroup,
			ConfigVersion:      item.ConfigVersion,
			CreatedBy:          item.CreatedBy,
			CreatedTime:        item.CreatedTime,
			UpdatedBy:          item.UpdatedBy,
			UpdatedTime:        item.UpdatedTime,
		})
	}

	res = &dto.ListFieldMappingConfigRes{
		List:  list,
		Total: total,
	}
	return
}

// GetOne 获取单个字段映射配置
func (s *fieldMappingConfigService) GetOne(ctx context.Context, req *dto.GetFieldMappingConfigReq) (res *dto.GetFieldMappingConfigRes, err error) {
	config, err := dict.FieldMappingConfig.GetOne(ctx, req)
	if err != nil {
		return nil, errors.New("获取配置详情失败")
	}
	if config == nil {
		return nil, errors.New("配置不存在")
	}

	return &dto.GetFieldMappingConfigRes{
		FieldMappingConfig: config,
		TransformTypeName:  s.getTransformTypeName(config.TransformType),
		BusinessDomainName: s.getBusinessDomainName(config.BusinessDomain),
	}, nil
}

// Update 更新字段映射配置
func (s *fieldMappingConfigService) Update(ctx context.Context, req *dto.UpdateFieldMappingConfigReq) (err error) {
	// 检查配置是否存在
	exist, err := dict.FieldMappingConfig.GetOne(ctx, &dto.GetFieldMappingConfigReq{Id: req.Id})
	if err != nil || exist == nil {
		return errors.New("配置不存在")
	}

	// 如果修改了关键字段，检查重复性
	if (req.VendorName != "" && req.VendorName != exist.VendorName) ||
		(req.ApiName != "" && req.ApiName != exist.ApiName) ||
		(req.SourceField != "" && req.SourceField != exist.SourceField) ||
		(req.TargetField != "" && req.TargetField != exist.TargetField) {

		vendorName := req.VendorName
		if vendorName == "" {
			vendorName = exist.VendorName
		}
		apiName := req.ApiName
		if apiName == "" {
			apiName = exist.ApiName
		}
		sourceField := req.SourceField
		if sourceField == "" {
			sourceField = exist.SourceField
		}
		targetField := req.TargetField
		if targetField == "" {
			targetField = exist.TargetField
		}

		exists, err := dict.FieldMappingConfig.CheckDuplicate(ctx, vendorName, apiName, sourceField, targetField, req.Id)
		if err != nil {
			return errors.New("检查配置重复性失败")
		}
		if exists {
			return errors.New("相同厂商、接口、源字段和目标字段的配置已存在")
		}
	}

	// 验证转换参数
	if req.TransformType != "" && req.TransformParams != nil {
		if err = s.validateTransformParams(req.TransformType, req.TransformParams); err != nil {
			return fmt.Errorf("转换参数验证失败: %v", err)
		}
	}

	// 验证生效时间和失效时间
	if req.EffectiveDate != nil && req.ExpiryDate != nil && req.EffectiveDate.After(*req.ExpiryDate) {
		return errors.New("生效时间不能晚于失效时间")
	}

	// 更新数据库
	_, err = dict.FieldMappingConfig.Update(ctx, req)
	if err != nil {
		return errors.New("更新配置失败")
	}

	return nil
}

// UpdateStatus 更新字段映射配置状态
func (s *fieldMappingConfigService) UpdateStatus(ctx context.Context, req *dto.UpdateFieldMappingConfigStatusReq) (err error) {
	_, err = dict.FieldMappingConfig.UpdateStatus(ctx, req.Id, req.IsActive)
	if err != nil {
		return errors.New("更新配置状态失败")
	}
	return nil
}

// Delete 删除字段映射配置
func (s *fieldMappingConfigService) Delete(ctx context.Context, req *dto.DeleteFieldMappingConfigReq) (err error) {
	_, err = dict.FieldMappingConfig.Delete(ctx, req)
	if err != nil {
		return errors.New("删除配置失败")
	}
	return nil
}

// QueryByVendorApi 根据厂商和接口查询字段映射
func (s *fieldMappingConfigService) QueryByVendorApi(ctx context.Context, req *dto.QueryFieldMappingByVendorApiReq) (res *dto.QueryFieldMappingByVendorApiRes, err error) {
	configs, err := dict.FieldMappingConfig.GetByVendorAndApi(ctx, req.VendorName, req.ApiName, req.ApiVersion, req.IsActive)
	if err != nil {
		return nil, errors.New("查询字段映射配置失败")
	}

	// 过滤掉已过期的配置
	var validConfigs []*entity.FieldMappingConfig
	now := time.Now()
	for _, config := range configs {
		if (config.EffectiveDate == nil || !config.EffectiveDate.After(now)) &&
			(config.ExpiryDate == nil || config.ExpiryDate.After(now)) {
			validConfigs = append(validConfigs, config)
		}
	}

	res = &dto.QueryFieldMappingByVendorApiRes{
		List: validConfigs,
	}
	return
}

// Validate 验证字段映射配置
func (s *fieldMappingConfigService) Validate(ctx context.Context, req *dto.ValidateFieldMappingReq) (res *dto.ValidateFieldMappingRes, err error) {
	ctx = context.WithValue(ctx, "user", &beans.User{UserName: "admin"})
	res = &dto.ValidateFieldMappingRes{
		IsValid: false,
	}

	// 验证基本配置
	if req.ConfigName == "" || req.VendorName == "" || req.ApiName == "" || req.SourceField == "" || req.TargetField == "" {
		res.Error = "配置名称、厂商名称、接口名称、源字段和目标字段不能为空"
		return
	}

	// 检查重复配置
	exists, err := dict.FieldMappingConfig.CheckDuplicate(ctx, req.VendorName, req.ApiName, req.SourceField, req.TargetField, 0)
	if err != nil {
		res.Error = "检查配置重复性失败"
		return
	}
	if exists {
		res.Error = "相同厂商、接口、源字段和目标字段的配置已存在"
		return
	}

	// 如果有测试值，尝试转换
	if req.TestValue != nil {
		// 这里可以实现具体的转换逻辑
		// 例如：根据转换类型和参数进行值转换
		res.TransformedValue = req.TestValue
		res.Warnings = []string{"转换逻辑需要根据具体业务实现"}
	}

	res.IsValid = true
	return
}

// validateRequiredFields 验证必填字段
func (s *fieldMappingConfigService) validateRequiredFields(req *dto.CreateFieldMappingConfigReq) error {
	if req.ConfigName == "" {
		return errors.New("配置名称不能为空")
	}
	if req.VendorName == "" {
		return errors.New("厂商名称不能为空")
	}
	if req.ApiName == "" {
		return errors.New("接口名称不能为空")
	}
	if req.SourceField == "" {
		return errors.New("源字段不能为空")
	}
	if req.TargetField == "" {
		return errors.New("目标字段不能为空")
	}
	if req.TargetFieldType == "" {
		return errors.New("目标字段类型不能为空")
	}
	return nil
}

// validateRequiredFieldsForBatch 批量创建的字段验证
func (s *fieldMappingConfigService) validateRequiredFieldsForBatch(config *dto.BatchFieldMappingConfigItem) error {
	if config.ConfigName == "" {
		return errors.New("配置名称不能为空")
	}
	if config.VendorName == "" {
		return errors.New("厂商名称不能为空")
	}
	if config.ApiName == "" {
		return errors.New("接口名称不能为空")
	}
	if config.SourceField == "" {
		return errors.New("源字段不能为空")
	}
	if config.TargetField == "" {
		return errors.New("目标字段不能为空")
	}
	if config.TargetFieldType == "" {
		return errors.New("目标字段类型不能为空")
	}
	return nil
}

// validateTransformParams 验证转换参数
func (s *fieldMappingConfigService) validateTransformParams(transformType string, params map[string]interface{}) error {
	if params == nil {
		return nil
	}

	switch transformType {
	case consts.TransformTypeFormatDate:
		if _, ok := params["source_format"]; !ok {
			return errors.New("日期格式化转换需要source_format参数")
		}
		if _, ok := params["target_format"]; !ok {
			return errors.New("日期格式化转换需要target_format参数")
		}
	case consts.TransformTypeMapValue:
		if len(params) == 0 {
			return errors.New("值映射转换需要映射规则参数")
		}
	case consts.TransformTypeConcat:
		if _, ok := params["fields"]; !ok {
			return errors.New("拼接转换需要fields参数")
		}
	case consts.TransformTypeRegex:
		if _, ok := params["pattern"]; !ok {
			return errors.New("正则提取转换需要pattern参数")
		}
	}

	return nil
}

// isValidBusinessDomain 验证业务域是否有效
func (s *fieldMappingConfigService) isValidBusinessDomain(domain string) bool {
	validDomains := []string{
		consts.BusinessDomainUser,
		consts.BusinessDomainOrder,
		consts.BusinessDomainProduct,
		consts.BusinessDomainPayment,
	}
	for _, valid := range validDomains {
		if domain == valid {
			return true
		}
	}
	return false
}

// getTransformTypeName 获取转换类型名称
func (s *fieldMappingConfigService) getTransformTypeName(transformType string) string {
	typeNames := map[string]string{
		consts.TransformTypeDirect:     "直接映射",
		consts.TransformTypeFormatDate: "日期格式化",
		consts.TransformTypeMapValue:   "值映射",
		consts.TransformTypeConcat:     "拼接",
		consts.TransformTypeCalc:       "计算",
		consts.TransformTypeRegex:      "正则提取",
	}
	if name, ok := typeNames[transformType]; ok {
		return name
	}
	return transformType
}

// getBusinessDomainName 获取业务域名称
func (s *fieldMappingConfigService) getBusinessDomainName(domain string) string {
	domainNames := map[string]string{
		consts.BusinessDomainUser:    "用户",
		consts.BusinessDomainOrder:   "订单",
		consts.BusinessDomainProduct: "商品",
		consts.BusinessDomainPayment: "支付",
	}
	if name, ok := domainNames[domain]; ok {
		return name
	}
	return domain
}

// GetActiveConfigsByBusinessDomain 根据业务域获取启用的配置
func (s *fieldMappingConfigService) GetActiveConfigsByBusinessDomain(ctx context.Context, businessDomain string) ([]entity.FieldMappingConfig, error) {
	return dict.FieldMappingConfig.GetActiveConfigsByBusinessDomain(ctx, businessDomain)
}

// GetFieldGroupsByVendorApi 获取指定厂商接口的字段分组
func (s *fieldMappingConfigService) GetFieldGroupsByVendorApi(ctx context.Context, vendorName, apiName string) ([]string, error) {
	return dict.FieldMappingConfig.GetFieldGroupsByVendorApi(ctx, vendorName, apiName)
}

// CleanExpiredConfigs 清理过期配置
func (s *fieldMappingConfigService) CleanExpiredConfigs(ctx context.Context) (int64, error) {
	return dict.FieldMappingConfig.DeleteExpiredConfigs(ctx)
}