// Package validator ...
//
// Description : validator ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2024-04-29 10:51
package validator

import (
	"bytes"
	"encoding/json"
	"fmt"
	"git.zhangdeman.cn/gateway/validator/define"
	"git.zhangdeman.cn/zhangdeman/consts"
	"git.zhangdeman.cn/zhangdeman/serialize"
	"git.zhangdeman.cn/zhangdeman/util"
	"git.zhangdeman.cn/zhangdeman/wrapper"
	"github.com/tidwall/gjson"
	"github.com/tidwall/sjson"
	"strings"
)

// RunForStruct 验证结构体
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 14:18 2024/4/29
func RunForStruct(sourceData interface{}, ruleList []*define.FieldRule) (map[string]interface{}, error) {
	if nil == sourceData {
		return map[string]interface{}{}, nil
	}
	byteData, _ := json.Marshal(sourceData)
	var (
		sourceMapData map[string]interface{}
		err           error
	)

	d := json.NewDecoder(bytes.NewReader(byteData))
	d.UseNumber()
	if err = d.Decode(&sourceMapData); nil != err {
		return nil, err
	}
	if err = Run(sourceMapData, ruleList); nil != err {
		return nil, err
	}
	return sourceMapData, nil
}

// Run 运行参数验证
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 14:13 2024/4/29
func Run(sourceData map[string]interface{}, ruleList []*define.FieldRule) error {
	if nil == sourceData || len(sourceData) == 0 {
		return nil
	}
	byteData, _ := json.Marshal(sourceData)
	for _, itemRule := range ruleList {
		if len(itemRule.Path) == 0 {
			// 未指定验证数据位置
			continue
		}
		inputFieldVal := gjson.GetBytes(byteData, itemRule.Path)
		if formatRule, err := validate(byteData, inputFieldVal, itemRule); nil != err {
			return err
		} else {
			if !itemRule.DisableRewrite {
				// 更新数据
				byteData, _ = sjson.SetBytes(byteData, itemRule.Path, formatRule)
			}
		}
	}
	sourceData = make(map[string]interface{})
	d := json.NewDecoder(bytes.NewReader(byteData))
	d.UseNumber()
	if err := d.Decode(&sourceData); nil != err {
		return err
	}
	return nil
}

// getDataStatus 获取数据状态
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:59 2024/4/29
func getDataStatus(val gjson.Result, dataType string) string {
	if !val.Exists() {
		return consts.DataStatusNotFound
	}
	switch dataType {
	case consts.DataTypeString:
		if len(val.String()) == 0 {
			return consts.DataStatusIsEmpty
		}
	case consts.DataTypeFloat:
		fallthrough
	case consts.DataTypeInt:
		if val.Float() == 0 {
			return consts.DataStatusIsZero
		}
	default:
		if strings.HasPrefix(dataType, "[]") {
			// 数组
			if len(val.Array()) == 0 {
				return consts.DataStatusIsEmpty
			}
		} else if strings.HasPrefix(dataType, "map") {
			// 对象
			if len(val.Map()) == 0 {
				return consts.DataStatusIsEmpty
			}
		}
	}
	return ""
}

// validate 验证字段
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 14:32 2024/4/29
func validate(sourceData []byte, val gjson.Result, rule *define.FieldRule) (interface{}, error) {
	inputVal := val.Value()
	if !val.Exists() {
		if rule.IsRequired {
			return nil, fmt.Errorf("%v : field is required, but not found", rule.Path)
		}
		// TODO : 验证有条件必传
		inputVal = rule.DefaultValue
	} else {
		if inputVal == nil {
			if !rule.AllowNil {
				return nil, fmt.Errorf("%v : field value is nil, but not allowed", rule.Path)
			}
			inputVal = rule.DefaultValue
		}
	}

	return handleData(inputVal, rule)
}

// handleData 处理数据
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 14:43 2024/4/29
func handleData(inputVal interface{}, rule *define.FieldRule) (interface{}, error) {
	switch rule.Type {
	case consts.DataTypeAny: // 任意类型
		return inputVal, nil
	case consts.DataTypeFloat: // float数据
		return handleFloat(inputVal, rule)
	case consts.DataTypeInt: // int类型
		return handleInt(inputVal, rule)
	case consts.DataTypeString: // 字符串处理
		return handleString(inputVal, rule)
	case consts.DataTypeMapStrFloat, consts.DataTypeMapStrBool,
		consts.DataTypeMapStrInt, consts.DataTypeMapStrUint:
		// 一律按照 map[string]float64处理
		return handleMapStringFloat(inputVal, rule)
	case consts.DataTypeMapStrAny: // 对象结构
		return handleMapStringAny(inputVal, rule)
	case consts.DataTypeMapStrSlice: // map列表

	case consts.DataTypeMapAnyAny: // 任意类型map

	}
	return nil, nil
}

// handleFloat 处理float数据
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:29 2024/4/29
func handleFloat(inputVal interface{}, rule *define.FieldRule) (float64, error) {
	var (
		err        error
		formatData float64
	)
	if err = util.ConvertAssign(&formatData, inputVal); nil != err {
		return 0, err
	}
	if !rule.AllowZero {
		return 0, fmt.Errorf("%v : field type is float, but zero val is not allowed", rule.Path)
	}
	if nil == rule.ValueLimit {
		return formatData, nil
	}
	if nil != rule.ValueLimit.Min && formatData < *rule.ValueLimit.Min {
		return 0, fmt.Errorf("%v : field type is float, min val is %v, real val is %v", rule.Path, *rule.ValueLimit.Min, formatData)
	}
	if nil != rule.ValueLimit.Max && formatData > *rule.ValueLimit.Max {
		return 0, fmt.Errorf("%v : field type is float, max val is %v, real val is %v", rule.Path, *rule.ValueLimit.Max, formatData)
	}
	if len(rule.ValueLimit.EnumList) > 0 {
		if wrapper.ArrayType(rule.ValueLimit.EnumList).Has(formatData) < 0 {
			return 0, fmt.Errorf("%v : field type is float, real val is %v, is not in enum list", rule.Path, formatData)
		}
	}
	return formatData, nil
}

// handleInt ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:36 2024/4/29
func handleInt(inputVal interface{}, rule *define.FieldRule) (int64, error) {
	var (
		err        error
		formatData int64
	)
	if err = util.ConvertAssign(&formatData, inputVal); nil != err {
		return 0, err
	}
	if _, err = handleFloat(formatData, rule); nil != err {
		return 0, err
	}
	return formatData, nil
}

// handleString ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:53 2024/4/29
func handleString(inputVal interface{}, rule *define.FieldRule) (string, error) {
	var (
		err        error
		formatData string
	)
	if err = util.ConvertAssign(&formatData, inputVal); nil != err {
		return "", err
	}
	if nil == rule.ValueLimit {
		return formatData, nil
	}
	if nil != rule.ValueLimit.Min {
		if float64(len(formatData)) < *rule.ValueLimit.Min {
			return "", fmt.Errorf("%v : data type is string, min length is %v, real length is %v", rule.Path, *rule.ValueLimit.Min, len(formatData))
		}
	}
	if nil != rule.ValueLimit.Max {
		if float64(len(formatData)) >= *rule.ValueLimit.Max {
			return "", fmt.Errorf("%v : data type is string, max length is %v, real length is %v", rule.Path, *rule.ValueLimit.Max, len(formatData))
		}
	}
	if len(rule.ValueLimit.EnumList) > 0 {
		if wrapper.ArrayType(rule.ValueLimit.EnumList).Has(formatData) < 0 {
			return "", fmt.Errorf("%v : data type is string, not in enum list, real val is %v", rule.Path, formatData)
		}
	}
	return formatData, nil
}

// handleMapStringFloat ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 16:38 2024/4/29
func handleMapStringFloat(inputVal interface{}, rule *define.FieldRule) (map[string]float64, error) {
	var (
		err error
		res map[string]float64
	)

	if err = strOrMapConvert(inputVal, &res); nil != err {
		return nil, err
	}

	dataFieldTable := make(map[string]string)
	for k, _ := range res {
		dataFieldTable[k] = k
	}

	if err = validateMap(dataFieldTable, rule); nil != err {
		return nil, err
	}

	return res, nil
}

// handleMapStringAny ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 17:19 2024/4/29
func handleMapStringAny(inputVal interface{}, rule *define.FieldRule) (map[string]interface{}, error) {
	var (
		err error
		res map[string]interface{}
	)

	if err = strOrMapConvert(inputVal, &res); nil != err {
		return nil, err
	}

	dataFieldTable := make(map[string]string)
	for k, _ := range res {
		dataFieldTable[k] = k
	}

	if err = validateMap(dataFieldTable, rule); nil != err {
		return nil, err
	}

	return res, nil
}

// strOrMapConvert 字符串或map转map
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 17:26 2024/4/29
func strOrMapConvert(inputVal interface{}, receiver interface{}) error {
	var (
		err error
	)

	if inputValStr, ok := inputVal.(string); ok {
		if err = serialize.JSON.UnmarshalWithNumber([]byte(inputValStr), receiver); nil != err {
			return err
		}
	} else {
		byteData := serialize.JSON.MarshalForByte(inputVal)
		if err = serialize.JSON.UnmarshalWithNumber(byteData, receiver); nil != err {
			return err
		}
	}
	return nil
}

// validateMap 验证map数据
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 17:21 2024/4/29
func validateMap(dataFieldTable map[string]string, rule *define.FieldRule) error {
	if nil == rule.ValueLimit {
		return nil
	}
	if nil != rule.ValueLimit.Min && float64(len(dataFieldTable)) < *rule.ValueLimit.Min {
		return fmt.Errorf("%v : data type is map, min item cnt is %v, real item cnt is %v", rule.Path, *rule.ValueLimit.Min, len(dataFieldTable))
	}
	if nil != rule.ValueLimit.Max && float64(len(dataFieldTable)) >= *rule.ValueLimit.Max {
		return fmt.Errorf("%v : data type is map, max item cnt is %v, real item max is %v", rule.Path, *rule.ValueLimit.Max, len(dataFieldTable))
	}
	if nil != rule.ValueLimit.Map {
		for _, itemField := range rule.ValueLimit.Map.IncludeFieldList {
			if _, exist := dataFieldTable[itemField]; !exist {
				return fmt.Errorf("%v : data type is map, %v field is required, but not found", rule.Path, itemField)
			}
		}
	}
	return nil
}