// Package filter ...
//
// Description : filter ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022-07-04 17:47
package filter

import (
	"fmt"
	"strings"

	"git.zhangdeman.cn/zhangdeman/util"
	"github.com/Jeffail/gabs"
	"github.com/pkg/errors"
	"github.com/tidwall/gjson"
)

// MapRule 映射规则
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 12:21 2022/7/4
type MapRule struct {
	SourcePath   string `json:"source_path"`   // 原路径
	MapPath      string `json:"map_path"`      // 映射路径
	Required     bool   `json:"required"`      // 必须存在
	DataType     string `json:"data_type"`     // 数据类型
	DefaultValue string `json:"default_value"` // 默认值, 以字符串传入, 会转换成 DataType
}

// NewFilter 过滤器实例
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:54 2022/7/4
func NewFilter(sourceData string, filterRuleList []MapRule) *filter {
	return &filter{
		sourceData:     sourceData,
		filterRuleList: filterRuleList,
		jsonObj:        &gabs.Container{},
	}
}

// filter 数据过滤
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:58 2022/7/4
type filter struct {
	sourceData     string
	filterRuleList []MapRule
	jsonObj        *gabs.Container // 生成的json对象实例
}

// Deal ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:59 2022/7/4
func (f *filter) Deal() ([]byte, error) {
	for _, rule := range f.filterRuleList {
		if strings.Contains(rule.SourcePath, "[]") {
			// 对于list的处理
			continue
		}
		sourceResult := gjson.Get(f.sourceData, rule.SourcePath)
		sourceVal := sourceResult.String()
		if !sourceResult.Exists() {
			// 不存在, 使用默认值
			sourceVal = rule.DefaultValue
		}
		formatVal, err := f.getValue(rule.DataType, sourceVal)
		if nil != err {
			return nil, fmt.Errorf("%s = %v can not convert to %s : %s", rule.SourcePath, sourceResult.Value(), rule.DataType, err.Error())
		}
		if _, err := f.jsonObj.SetP(formatVal, rule.MapPath); nil != err {
			return nil, fmt.Errorf("%s set val = %v fail : %s", rule.MapPath, formatVal, err.Error())
		}
	}
	return f.jsonObj.EncodeJSON(), nil
}

// getValue 获取值
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 12:25 2022/7/4
func (f *filter) getValue(dataType string, defaultValue string) (interface{}, error) {
	switch dataType {
	case "int8":
		fallthrough
	case "int16":
		fallthrough
	case "int32":
		fallthrough
	case "int64":
		fallthrough
	case "int":
		var (
			err error
			val int64
		)
		err = util.ConvertAssign(&val, defaultValue)
		return val, err
	case "uint8":
		fallthrough
	case "uint16":
		fallthrough
	case "uint32":
		fallthrough
	case "uint64":
		fallthrough
	case "uint":
		var (
			err error
			val uint64
		)
		err = util.ConvertAssign(&val, defaultValue)
		return val, err
	case "bool":
		var (
			err error
			val bool
		)
		err = util.ConvertAssign(&val, defaultValue)
		return val, err
	case "float32":
		fallthrough
	case "float64":
		var (
			err error
			val float64
		)
		err = util.ConvertAssign(&val, defaultValue)
		return val, err
	case "string":
		return defaultValue, nil
	default:
		return nil, errors.New(dataType + " is not support!")
	}
}