package assign

import (
	"git.sxidc.com/go-tools/utils/reflectutils"
	"git.sxidc.com/go-tools/utils/strutils"
	"reflect"
	"strings"
	"time"
)

func DefaultUsage(from any, to any) error {
	return UseTag(from, to,
		func(fromFieldName string, fromFieldElemValue reflect.Value, retFieldElementValue reflect.Value, tag *Tag) error {
			if fromFieldElemValue.IsZero() {
				return nil
			}

			return defaultCallback(fromFieldElemValue, retFieldElementValue, tag)
		})
}

func defaultCallback(fromFieldElemValue reflect.Value, toFieldElemValue reflect.Value, tag *Tag) error {
	fromKind := reflectutils.GroupValueKind(fromFieldElemValue)
	toKind := reflectutils.GroupValueKind(toFieldElemValue)

	var fromAny any
	switch fromKind {
	case reflect.Struct:
		// time.Time类型的结构，接收字段是string类型，使用FormatTime的格式转换
		if reflectutils.IsValueTime(fromFieldElemValue) && toKind == reflect.String {
			fromString := fromFieldElemValue.Interface().(time.Time).Format(tag.TimeLayout)
			fromAny = trimFromString(fromString, tag)
			break
		}

		// 不是time.Time类型的结构，接收字段是结构，执行结构到结构字段的赋值
		if !reflectutils.IsValueTime(fromFieldElemValue) && toKind == reflect.Struct {
			return parseTag(fromFieldElemValue, &toFieldElemValue, func(fromFieldName string, fromFieldElemValue reflect.Value, toFieldElementValue reflect.Value, tag *Tag) error {
				return defaultCallback(fromFieldElemValue, toFieldElementValue, tag)
			})
		}

		// 直接将整个结构进行字段赋值
		fromAny = fromFieldElemValue.Interface()
	case reflect.Slice:
		if reflectutils.IsSliceValueOf(fromFieldElemValue, reflect.String) && toKind == reflect.String {
			fromString := strings.Join(fromFieldElemValue.Interface().([]string), tag.JoinWith)
			fromAny = trimFromString(fromString, tag)
			break
		}

		fromAny = fromFieldElemValue.Interface()
	case reflect.String:
		fromString := fromFieldElemValue.String()

		if reflectutils.IsValueTime(toFieldElemValue) {
			toTimeField, err := time.ParseInLocation(tag.TimeLayout, fromString, time.Local)
			if err != nil {
				return err
			}

			fromAny = toTimeField
			break
		}

		if reflectutils.IsSliceValueOf(toFieldElemValue, reflect.String) {
			fromAny = strings.Split(fromString, tag.SplitWith)
			break
		}

		fromAny = trimFromString(fromString, tag)
	default:
		fromAny = fromFieldElemValue.Interface()
	}

	switch toKind {
	case reflect.Int64:
		return reflectutils.AssignInt64Value(fromAny, toFieldElemValue)
	case reflect.Uint64:
		return reflectutils.AssignUint64Value(fromAny, toFieldElemValue)
	case reflect.Float64:
		return reflectutils.AssignFloat64Value(fromAny, toFieldElemValue)
	case reflect.Bool:
		return reflectutils.AssignBoolValue(fromAny, toFieldElemValue)
	case reflect.String:
		return reflectutils.AssignStringValue(fromAny, toFieldElemValue)
	default:
		toFieldElemValue.Set(reflect.ValueOf(fromAny))
		return nil
	}
}

func trimFromString(fromString string, tag *Tag) string {
	if strutils.IsStringNotEmpty(tag.Trim) {
		return strings.Trim(fromString, tag.Trim)
	} else {
		if strutils.IsStringNotEmpty(tag.TrimPrefix) {
			return strings.TrimPrefix(fromString, tag.TrimPrefix)
		}

		if strutils.IsStringNotEmpty(tag.TrimSuffix) {
			return strings.TrimSuffix(fromString, tag.TrimSuffix)
		}
	}

	return fromString
}