package utils

import (
	"fmt"
	"reflect"
	"ulink-admin/frame"
)

func CopyFields(a interface{}, b interface{}, fields ...string) (err error) {
	at := reflect.TypeOf(a)
	av := reflect.ValueOf(a)
	bt := reflect.TypeOf(b)
	bv := reflect.ValueOf(b)
	// 简单判断下
	if at.Kind() != reflect.Ptr {
		frame.Throw(frame.BUSINESS_CODE, "请传入指针类型")
		return
	}
	if bt.Kind() == reflect.Ptr { //处理指针
		bt = bt.Elem()
		bv = bv.Elem()
	}
	av = reflect.ValueOf(av.Interface())
	// 要复制哪些字段
	_fields := make([]string, 0)
	if len(fields) > 0 {
		_fields = fields
	} else {
		for i := 0; i < bv.NumField(); i++ {
			_fields = append(_fields, bt.Field(i).Name)
		}
	}
	if len(_fields) == 0 {
		fmt.Println("no fields to copy")
		return
	}
	// 复制
	for i := 0; i < len(_fields); i++ {
		name := _fields[i]
		f := av.Elem().FieldByName(name)
		bValue := bv.FieldByName(name)
		// a中有同名的字段并且类型一致才复制
		if f.IsValid() && f.Kind() == bValue.Kind() {
			f.Set(bValue)
		} else {
			fmt.Printf("no such field or different kind, fieldName: %s\n", name)
		}
	}
	return
}

func GetFieldS(bean interface{}) []string {
	fields := make([]string, 0)
	beanType := reflect.TypeOf(bean)
	beanValue := reflect.ValueOf(bean)
	if beanType.Kind() == reflect.Ptr { //处理指针
		beanType = beanType.Elem()
		beanValue = beanValue.Elem()
	}
	if beanType.Kind() != reflect.Struct { //如果不是struct类型，直接返回
		return fields
	}
	for i := 0; i < beanType.NumField(); i++ {
		field := beanType.Field(i) //通过这个i作为它的索引，从0开始来取得它的字段
		value := beanValue.Field(i)
		if value.IsValid() {
			fields = append(fields, Camel2Case(field.Name))
		}
	}
	return fields
}