// Package v10 ...
//
// Description : v10 ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2025-01-24 10:32
package v10

import (
	"errors"
	"fmt"
	"git.zhangdeman.cn/gateway/validator/v10/define"
	"strings"
)

// DefaultValidateRuleGenerateFunc 验证规则生成的默认方法
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 10:33 2025/1/24
func DefaultValidateRuleGenerateFunc(validateRule define.GenerateRuleExpressConfig) (express string, err error) {
	ruleConfig := validateRule.Rule.Config()
	if len(ruleConfig.ValidatorRule.String()) == 0 {
		return "", define.ErrValidatorRuleIsEmpty
	}
	if ruleConfig.WithoutParam {
		// 验证规则不需要任何参数, 舍弃参数
		return ruleConfig.ValidatorRule.String(), nil
	}
	// 验证参数数量
	if ruleConfig.MinParamCnt > 0 && len(validateRule.ParamList) < ruleConfig.MinParamCnt {
		return "", errors.New(ruleConfig.ValidatorRule.String() + " : " + define.ErrValidatorRuleParamCntIsTooLess.Error() + "-> " + fmt.Sprintf("%v", ruleConfig.MinParamCnt))
	}
	if ruleConfig.MaxParamCnt > 0 && len(validateRule.ParamList) > ruleConfig.MaxParamCnt {
		return "", errors.New(ruleConfig.ValidatorRule.String() + " :" + define.ErrValidatorRuleParamCntIsTooMore.Error() + " -> " + fmt.Sprintf("%v", ruleConfig.MaxParamCnt))
	}
	if ruleConfig.ParamCntMustEven && len(validateRule.ParamList)%2 != 0 {
		return "", errors.New(ruleConfig.ValidatorRule.String() + " : " + define.ErrValidatorRuleParamCntIsNotEven.Error())
	}
	paramStrList := make([]string, 0)
	for _, param := range validateRule.ParamList {
		paramStrList = append(paramStrList, fmt.Sprintf("%v", param))
	}
	return ruleConfig.ValidatorRule.String() + "=" + strings.Join(paramStrList, " "), nil
}

// DefaultFieldValidateRuleGenerateFunc 字段验证表达式生成
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:44 2025/1/24
func DefaultFieldValidateRuleGenerateFunc(fieldValidateRule define.FieldValidateGenerateConfig) (string, error) {
	if len(fieldValidateRule.RuleGroup) == 0 && len(fieldValidateRule.RuleSimple.Rule.String()) == 0 {
		return "", define.ErrValidatorRuleGroupOrSimpleRuleAllEmpty
	}
	if len(fieldValidateRule.RuleGroup) == 0 {
		// note: 当 fieldValidateRule.RuleGroup 不为空时, 会忽略 fieldValidateRule.RuleSimple 配置
		fieldValidateRule.RuleGroup = [][]define.GenerateRuleExpressConfig{
			[]define.GenerateRuleExpressConfig{
				fieldValidateRule.RuleSimple,
			},
		}
	}
	finalExpressList := make([]string, 0)
	for _, itemGroupList := range fieldValidateRule.RuleGroup {
		expressList := make([]string, 0)
		for _, itemRule := range itemGroupList {
			if fieldExpress, err := validatorRuleExpressGenerateFunc(itemRule); nil != err {
				return "", err
			} else {
				expressList = append(expressList, fieldExpress)
			}
		}
		finalExpressList = append(finalExpressList, strings.Join(expressList, ","))
	}
	return strings.Join(finalExpressList, "|"), nil
}