package cast

import (
	"bytes"
	"encoding/json"
	"fmt"
	"reflect"
	"slices"
	"strconv"
	"strings"
	"time"
)

// If 泛型三元表达式
func If[T any](condition bool, trueVal, falseVal T) T {
	if condition {
		return trueVal
	}
	return falseVal
}

// In 泛型包含判断
func In[T comparable](arr []T, val T) bool {
	return slices.Contains(arr, val)
}

// As 忽略错误，返回零值 (消除摩擦)
func As[T any](v T, err error) T {
	if err != nil {
		var zero T
		return zero
	}
	return v
}

func RealValue(v reflect.Value) reflect.Value {
	for v.Kind() == reflect.Pointer || v.Kind() == reflect.Interface {
		if v.IsNil() {
			return v
		}
		v = v.Elem()
	}
	return v
}

// --- Core Cast Logic ---

var (
	timeType = reflect.TypeOf(time.Time{})
)

// To 深度转换 (支持基础类型、Slice、Map、Struct 及 JSON 自动转换，零摩擦模式)
func To[T any](v any) T {
	var res T
	performRecursiveTo(reflect.ValueOf(v), reflect.ValueOf(&res).Elem())
	return res
}

// Convert 深度转换 (支持基础类型、Slice、Map、Struct 及 JSON 自动转换，原地更新)
func Convert(dst, src any) {
	if dst == nil {
		return
	}

	dstV := reflect.ValueOf(dst)
	var srcV reflect.Value
	if v, ok := src.(reflect.Value); ok {
		srcV = v
	} else {
		srcV = reflect.ValueOf(src)
	}

	// Task 1: 拦截“自我转换”死循环陷阱 (Self-Assignment Guard)
	if dstV.Kind() == reflect.Pointer && srcV.Kind() == reflect.Pointer {
		if dstV.Pointer() == srcV.Pointer() {
			return
		}
	}

	performRecursiveTo(srcV, dstV)
}

func performRecursiveTo(src, dst reflect.Value) {
	// 0. 处理 Interface 目标 (直接赋值)
	if dst.Kind() == reflect.Interface {
		if dst.CanSet() {
			dst.Set(RealValue(src))
		}
		return
	}

	// 1. 处理指针 (自动初始化与解引用)
	for dst.Kind() == reflect.Pointer {
		if dst.IsNil() {
			if dst.CanSet() {
				dst.Set(reflect.New(dst.Type().Elem()))
			} else {
				return
			}
		}
		dst = dst.Elem()
	}

	// 2. 解开源数据
	src = RealValue(src)
	if !src.IsValid() {
		return
	}

	dstType := dst.Type()

	// 3. 处理 JSON Unmarshaler 接口 (优先级高)
	if dst.CanAddr() {
		if unmarshaler, ok := dst.Addr().Interface().(json.Unmarshaler); ok {
			var b []byte
			if src.Kind() == reflect.String {
				b = []byte(src.String())
			} else if src.Kind() == reflect.Slice && src.Type().Elem().Kind() == reflect.Uint8 {
				b = src.Bytes()
			} else {
				b, _ = ToJSONBytes(src.Interface())
			}
			if len(b) > 0 {
				_ = unmarshaler.UnmarshalJSON(b)
				return
			}
		}
	}

	// 4. Frictionless 增强：单值 <-> 切片 自动转换
	if src.Kind() == reflect.Slice && src.Type().Elem().Kind() != reflect.Uint8 && src.Len() > 0 &&
		dst.Kind() != reflect.Slice && dst.Kind() != reflect.Array && dst.Kind() != reflect.Map {
		src = RealValue(src.Index(0))
	}

	// 5. 基础类型快速转换 (利用 cast 已有的高性能基础函数)
	switch dst.Kind() {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		if dst.CanSet() {
			dst.SetInt(Int64(src.Interface()))
		}
		return
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		if dst.CanSet() {
			dst.SetUint(Uint64(src.Interface()))
		}
		return
	case reflect.Float32, reflect.Float64:
		if dst.CanSet() {
			dst.SetFloat(Float64(src.Interface()))
		}
		return
	case reflect.String:
		if dst.CanSet() {
			if isComplexValue(src.Interface()) {
				s, _ := ToJSON(src.Interface())
				dst.SetString(s)
			} else {
				dst.SetString(String(src.Interface()))
			}
		}
		return
	case reflect.Bool:
		if dst.CanSet() {
			dst.SetBool(Bool(src.Interface()))
		}
		return
	}

	// 原生 time.Time 支持
	if dstType == timeType {
		if dst.CanSet() {
			dst.Set(reflect.ValueOf(ToTime(src.Interface(), "")))
		}
		return
	}

	// 6. 复杂容器深度递归转换
	switch dst.Kind() {
	case reflect.Struct:
		if src.Kind() == reflect.Map {
			recursiveMapToStruct(src, dst)
		} else if src.Kind() == reflect.Struct {
			recursiveStructToStruct(src, dst)
		} else if src.Kind() == reflect.String || (src.Kind() == reflect.Slice && src.Type().Elem().Kind() == reflect.Uint8) {
			if dst.CanAddr() {
				_ = UnmarshalJSON(src.Interface(), dst.Addr().Interface())
			}
		}
	case reflect.Map:
		if dst.IsNil() {
			if dst.CanSet() {
				dst.Set(reflect.MakeMap(dstType))
			} else {
				return
			}
		}
		if src.Kind() == reflect.Map {
			recursiveMapToMap(src, dst)
		} else if src.Kind() == reflect.Struct {
			recursiveStructToMap(src, dst)
		} else if src.Kind() == reflect.Slice || src.Kind() == reflect.Array {
			recursiveSliceToMap(src, dst)
		} else if src.Kind() == reflect.String {
			if dst.CanAddr() {
				_ = UnmarshalJSON(src.Interface(), dst.Addr().Interface())
			}
		}
	case reflect.Slice:
		if dstType.Elem().Kind() == reflect.Uint8 {
			if dst.CanSet() {
				if isComplexValue(src.Interface()) {
					b, _ := ToJSONBytes(src.Interface())
					dst.SetBytes(b)
				} else {
					dst.SetBytes(toBytes(src.Interface()))
				}
			}
		} else {
			// JSON/CSV 字符串增强
			if src.Kind() == reflect.String {
				s := src.String()
				if isJSONText(s) {
					if dst.CanAddr() {
						_ = UnmarshalJSON(s, dst.Addr().Interface())
						return
					}
				}
				if !strings.HasPrefix(s, "[") && strings.Contains(s, ",") {
					src = reflect.ValueOf(Split(s, ","))
				}
			}
			recursiveSliceToSlice(src, dst)
		}
	case reflect.Func:
		if src.Kind() == reflect.Func {
			dst.Set(reflect.MakeFunc(dstType, func(args []reflect.Value) []reflect.Value {
				srcType := src.Type()
				inParams := make([]reflect.Value, srcType.NumIn())
				for i := 0; i < srcType.NumIn(); i++ {
					inParams[i] = reflect.New(srcType.In(i)).Elem()
					if i < len(args) {
						performRecursiveTo(args[i], inParams[i])
					}
				}
				results := src.Call(inParams)
				outParams := make([]reflect.Value, dstType.NumOut())
				for i := 0; i < dstType.NumOut(); i++ {
					outParams[i] = reflect.New(dstType.Out(i)).Elem()
					if i < len(results) {
						performRecursiveTo(results[i], outParams[i])
					}
				}
				return outParams
			}))
		}
	}
}

// 内部递归助手 (零分配/高性能设计)

func recursiveMapToStruct(src, dst reflect.Value) {
	if !dst.CanAddr() {
		return
	}
	dstAddr := dst.Addr()
	dstType := dst.Type()
	descriptor := getDecoderFieldMap(dstType)
	iter := src.MapRange() // 零分配遍历
	for iter.Next() {
		rk := iter.Key()
		var key string
		if rk.Kind() == reflect.String {
			key = rk.String()
		} else {
			key = String(rk.Interface())
		}

		if index, isTime, format, ok := matchField(key, descriptor); ok {
			field := dst.Field(index)
			fieldInfo := dstType.Field(index)

			// ParseHook 支持: ParseFieldName(sourceType) FieldType
			if method, ok := dstAddr.Type().MethodByName("Parse" + fieldInfo.Name); ok {
				arg := reflect.New(method.Type.In(1)).Elem()
				performRecursiveTo(iter.Value(), arg)
				res := method.Func.Call([]reflect.Value{dstAddr, arg})
				field.Set(res[0])
				continue
			}

			if isTime {
				field.Set(reflect.ValueOf(ToTime(iter.Value().Interface(), format)))
			} else {
				performRecursiveTo(iter.Value(), field)
			}
		}
	}
}

func recursiveStructToStruct(src, dst reflect.Value) {
	if !dst.CanAddr() {
		return
	}
	dstAddr := dst.Addr()
	srcType := src.Type()
	dstType := dst.Type()
	descriptor := getDecoderFieldMap(dstType)
	for i := 0; i < src.NumField(); i++ {
		field := srcType.Field(i)
		if !field.IsExported() {
			continue
		}
		if field.Anonymous {
			recursiveStructToStruct(src.Field(i), dst)
			continue
		}
		// 使用 matchField 实现归一化 Key 匹配 (零分配)
		if index, isTime, format, ok := matchField(field.Name, descriptor); ok {
			df := dst.Field(index)
			fieldInfo := dstType.Field(index)

			// ParseHook 支持
			if method, ok := dstAddr.Type().MethodByName("Parse" + fieldInfo.Name); ok {
				arg := reflect.New(method.Type.In(1)).Elem()
				performRecursiveTo(src.Field(i), arg)
				res := method.Func.Call([]reflect.Value{dstAddr, arg})
				df.Set(res[0])
				continue
			}

			if isTime {
				df.Set(reflect.ValueOf(ToTime(src.Field(i).Interface(), format)))
			} else {
				performRecursiveTo(src.Field(i), df)
			}
		}
	}
}

func recursiveMapToMap(src, dst reflect.Value) {
	kt := dst.Type().Key()
	vt := dst.Type().Elem()
	newKey := reflect.New(kt).Elem()
	newVal := reflect.New(vt).Elem()
	iter := src.MapRange()
	for iter.Next() {
		newKey.Set(reflect.Zero(kt))
		performRecursiveTo(iter.Key(), newKey)
		newVal.Set(reflect.Zero(vt))
		performRecursiveTo(iter.Value(), newVal)
		dst.SetMapIndex(newKey, newVal)
	}
}

func recursiveStructToMap(src, dst reflect.Value) {
	kt := dst.Type().Key()
	vt := dst.Type().Elem()
	newKey := reflect.New(kt).Elem()
	newVal := reflect.New(vt).Elem()
	srcType := src.Type()
	for i := 0; i < src.NumField(); i++ {
		field := srcType.Field(i)
		if !field.IsExported() {
			continue
		}
		if field.Anonymous {
			recursiveStructToMap(src.Field(i), dst)
			continue
		}
		newKey.Set(reflect.Zero(kt))
		performRecursiveTo(reflect.ValueOf(GetLowerName(field.Name)), newKey)
		newVal.Set(reflect.Zero(vt))
		performRecursiveTo(src.Field(i), newVal)
		dst.SetMapIndex(newKey, newVal)
	}
}

func recursiveSliceToMap(src, dst reflect.Value) {
	kt := dst.Type().Key()
	vt := dst.Type().Elem()
	newKey := reflect.New(kt).Elem()
	newVal := reflect.New(vt).Elem()
	for i := 0; i < src.Len(); i += 2 {
		newKey.Set(reflect.Zero(kt))
		performRecursiveTo(src.Index(i), newKey)
		newVal.Set(reflect.Zero(vt))
		if i+1 < src.Len() {
			performRecursiveTo(src.Index(i+1), newVal)
		}
		dst.SetMapIndex(newKey, newVal)
	}
}

func recursiveSliceToSlice(src, dst reflect.Value) {
	et := dst.Type().Elem()
	temp := reflect.New(et).Elem()
	if src.Kind() == reflect.Slice || src.Kind() == reflect.Array {
		l := src.Len()
		dst.Set(reflect.MakeSlice(dst.Type(), l, l))
		for i := 0; i < l; i++ {
			temp.Set(reflect.Zero(et))
			performRecursiveTo(src.Index(i), temp)
			dst.Index(i).Set(temp)
		}
	} else {
		// Frictionless: 自动包装单值为切片 (覆盖赋值)
		dst.Set(reflect.MakeSlice(dst.Type(), 1, 1))
		temp.Set(reflect.Zero(et))
		performRecursiveTo(src, temp)
		dst.Index(0).Set(temp)
	}
}

func ToTime(v any, format string) time.Time {
	if v == nil {
		return time.Time{}
	}
	if t, ok := v.(time.Time); ok {
		return t.In(DefaultTimeZone.loc)
	}
	if format != "" {
		s := String(v)
		if t, err := time.ParseInLocation(format, s, DefaultTimeZone.loc); err == nil {
			return t
		}
	}
	return DefaultTimeZone.ParseTime(v)
}

func reflectCast(value any, t reflect.Type) reflect.Value {
	var v reflect.Value
	if t.Kind() == reflect.Ptr {
		v = reflect.New(t.Elem())
	} else {
		v = reflect.New(t).Elem()
	}
	performRecursiveTo(reflect.ValueOf(value), v)
	return v
}

func reflectCastE(value any, t reflect.Type) (reflect.Value, error) {
	return reflectCast(value, t), nil
}

func ToInt64E(v any) (int64, error) {
	return Int64(v), nil
}

func ToUint64E(v any) (uint64, error) {
	return Uint64(v), nil
}

func ToFloat64E(v any) (float64, error) {
	return Float64(v), nil
}

func isJSONText(v any) bool {
	switch val := v.(type) {
	case string:
		s := strings.TrimSpace(val)
		return strings.HasPrefix(s, "{") || strings.HasPrefix(s, "[")
	case []byte:
		s := bytes.TrimSpace(val)
		return bytes.HasPrefix(s, []byte("{")) || bytes.HasPrefix(s, []byte("["))
	}
	return false
}

func isComplexType(t reflect.Type) bool {
	kind := t.Kind()
	for kind == reflect.Ptr {
		t = t.Elem()
		kind = t.Kind()
	}
	return kind == reflect.Struct || kind == reflect.Map || (kind == reflect.Slice && t.Elem().Kind() != reflect.Uint8)
}

func isComplexValue(v any) bool {
	if v == nil {
		return true
	}
	rv := RealValue(reflect.ValueOf(v))
	if !rv.IsValid() || rv.Kind() == reflect.Pointer || rv.Kind() == reflect.Interface {
		return true
	}
	kind := rv.Kind()
	return kind == reflect.Struct || kind == reflect.Map || (kind == reflect.Slice && rv.Type().Elem().Kind() != reflect.Uint8)
}

func parseInt(s string) int64 {
	i, err := strconv.ParseInt(s, 10, 64)
	if err == nil {
		return i
	}
	if f, err := strconv.ParseFloat(s, 64); err == nil {
		return int64(f)
	}
	return 0
}

func parseUint(s string) uint64 {
	i, err := strconv.ParseUint(s, 10, 64)
	if err == nil {
		return i
	}
	if f, err := strconv.ParseFloat(s, 64); err == nil {
		return uint64(f)
	}
	return 0
}

func Int(value any) int { return int(Int64(value)) }

// Helper for integer coercion to avoid repetition
func toInt64(value any) (int64, bool) {
	switch v := value.(type) {
	case int:
		return int64(v), true
	case int8:
		return int64(v), true
	case int16:
		return int64(v), true
	case int32:
		return int64(v), true
	case int64:
		return v, true
	case uint:
		return int64(v), true
	case uint8:
		return int64(v), true
	case uint16:
		return int64(v), true
	case uint32:
		return int64(v), true
	case uint64:
		return int64(v), true
	case float32:
		return int64(v), true
	case float64:
		return int64(v), true
	case bool:
		return If(v, int64(1), int64(0)), true
	}
	return 0, false
}

func Int64(value any) int64 {
	if value == nil {
		return 0
	}
	if i, ok := toInt64(value); ok {
		return i
	}

	switch realValue := value.(type) {
	case []byte:
		return parseInt(string(realValue))
	case string:
		return parseInt(realValue)
	}

	rv := reflect.ValueOf(value)
	if rv.Kind() == reflect.Pointer || rv.Kind() == reflect.Interface {
		if rv = RealValue(rv); rv.IsValid() && rv.CanInterface() && rv.Kind() != reflect.Pointer {
			return Int64(rv.Interface())
		}
	}
	return 0
}

func Uint(value any) uint { return uint(Uint64(value)) }

func Uint64(value any) uint64 {
	if value == nil {
		return 0
	}
	switch realValue := value.(type) {
	case int:
		return uint64(realValue)
	case int8:
		return uint64(realValue)
	case int16:
		return uint64(realValue)
	case int32:
		return uint64(realValue)
	case int64:
		return uint64(realValue)
	case uint:
		return uint64(realValue)
	case uint8:
		return uint64(realValue)
	case uint16:
		return uint64(realValue)
	case uint32:
		return uint64(realValue)
	case uint64:
		return realValue
	case float32:
		return uint64(realValue)
	case float64:
		return uint64(realValue)
	case bool:
		return If(realValue, uint64(1), uint64(0))
	case []byte:
		return parseUint(string(realValue))
	case string:
		return parseUint(realValue)
	}
	rv := reflect.ValueOf(value)
	if rv.Kind() == reflect.Pointer || rv.Kind() == reflect.Interface {
		if rv = RealValue(rv); rv.IsValid() && rv.CanInterface() && rv.Kind() != reflect.Pointer {
			return Uint64(rv.Interface())
		}
	}
	return 0
}

func Float(value any) float32 { return float32(Float64(value)) }

func Float64(value any) float64 {
	if value == nil {
		return 0
	}
	switch realValue := value.(type) {
	case int, int8, int16, int32, int64:
		return float64(Int64(realValue))
	case uint, uint8, uint16, uint32, uint64:
		return float64(Uint64(realValue))
	case float32:
		return float64(realValue)
	case float64:
		return realValue
	case bool:
		return If(realValue, 1.0, 0.0)
	case []byte:
		i, err := strconv.ParseFloat(string(realValue), 64)
		if err == nil {
			return i
		}
	case string:
		i, err := strconv.ParseFloat(realValue, 64)
		if err == nil {
			return i
		}
	}
	rv := reflect.ValueOf(value)
	if rv.Kind() == reflect.Pointer || rv.Kind() == reflect.Interface {
		if rv = RealValue(rv); rv.IsValid() && rv.CanInterface() && rv.Kind() != reflect.Pointer {
			return Float64(rv.Interface())
		}
	}
	return 0
}

func String(value any) string {
	if value == nil {
		return ""
	}
	switch realValue := value.(type) {
	case int, int8, int16, int32, int64:
		return strconv.FormatInt(Int64(realValue), 10)
	case uint, uint8, uint16, uint32, uint64:
		return strconv.FormatUint(Uint64(realValue), 10)
	case float32:
		return strconv.FormatFloat(float64(realValue), 'f', -1, 32)
	case float64:
		return strconv.FormatFloat(realValue, 'f', -1, 64)
	case bool:
		return If(realValue, "true", "false")
	case string:
		return realValue
	case []byte:
		return string(realValue)
	}
	rv := reflect.ValueOf(value)
	if rv.Kind() == reflect.Pointer || rv.Kind() == reflect.Interface {
		if rv = RealValue(rv); rv.IsValid() && rv.CanInterface() && rv.Kind() != reflect.Pointer {
			return String(rv.Interface())
		}
	}
	return fmt.Sprint(value)
}

func Bool(value any) bool {
	if value == nil {
		return false
	}
	if b, ok := value.(bool); ok {
		return b
	}
	if i, ok := toInt64(value); ok {
		return i != 0
	}
	switch realValue := value.(type) {
	case []byte:
		s := strings.ToLower(string(realValue))
		return s == "1" || s == "t" || s == "true"
	case string:
		s := strings.ToLower(realValue)
		return s == "1" || s == "t" || s == "true"
	}
	rv := reflect.ValueOf(value)
	if rv.Kind() == reflect.Pointer || rv.Kind() == reflect.Interface {
		if rv = RealValue(rv); rv.IsValid() && rv.CanInterface() && rv.Kind() != reflect.Pointer {
			return Bool(rv.Interface())
		}
	}
	return false
}

func Duration(value any) time.Duration {
	if value == nil {
		return 0
	}
	switch realValue := value.(type) {
	case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
		return time.Duration(Int64(realValue))
	case float32, float64:
		return time.Duration(Float64(realValue) * float64(time.Second))
	case []byte, string:
		if result, err := time.ParseDuration(String(realValue)); err == nil {
			return result
		}
	}
	rv := reflect.ValueOf(value)
	if rv.Kind() == reflect.Pointer || rv.Kind() == reflect.Interface {
		if rv = RealValue(rv); rv.IsValid() && rv.CanInterface() && rv.Kind() != reflect.Pointer {
			return Duration(rv.Interface())
		}
	}
	return 0
}

func ToJSONBytes(value any) ([]byte, error) {
	return fastToJSONBytes(value)
}

func ToJSONDesensitizeBytes(value any, keys []string) ([]byte, error) {
	return fastToJSONBytes(value, keys...)
}

func ToJSON(value any) (string, error) {
	b, err := ToJSONBytes(value)
	return string(b), err
}

func PrettyToJSON(value any) string {
	j := As(ToJSONBytes(value))
	r := &bytes.Buffer{}
	if err := json.Indent(r, j, "", "  "); err == nil {
		return r.String()
	}
	return string(j)
}

func toBytes(data any) []byte {
	if data == nil {
		return nil
	}
	switch v := data.(type) {
	case []byte:
		return v
	case string:
		return []byte(v)
	}
	return []byte(String(data))
}

func UnmarshalJSON(data any, value any) error {
	b := toBytes(data)
	if b == nil {
		return fmt.Errorf("nil data")
	}
	return fastUnmarshalJSONBytes(b, value)
}

func FromJSON[T any](data any) (T, error) {
	var v T
	err := UnmarshalJSON(data, &v)
	return v, err
}

// --- Others (Keep logic but clean style) ---

func Split(s, sep string) []string {
	ss := strings.Split(s, sep)
	out := make([]string, 0, len(ss))
	for _, s1 := range ss {
		if s2 := strings.TrimSpace(s1); s2 != "" {
			out = append(out, s2)
		}
	}
	return out
}

func SplitArgs(s string) []string {
	var res []string
	var builder strings.Builder
	inQuote := false
	escaped := false

	chars := []rune(s)
	for i := 0; i < len(chars); i++ {
		c := chars[i]

		if escaped {
			builder.WriteRune(c)
			escaped = false
			continue
		}

		if c == '\\' {
			escaped = true
			continue
		}

		if c == '"' {
			inQuote = !inQuote
			continue
		}

		if c == ' ' && !inQuote {
			if builder.Len() > 0 {
				res = append(res, builder.String())
				builder.Reset()
			}
			continue
		}

		builder.WriteRune(c)
	}

	if builder.Len() > 0 {
		res = append(res, builder.String())
	}
	return res
}

func JoinArgs(arr []string, sep string) string {
	var builder strings.Builder
	for i, s := range arr {
		if i > 0 {
			builder.WriteString(sep)
		}
		// 如果包含空格或引号，则需要包裹引号并转义内部引号
		if strings.ContainsRune(s, ' ') || strings.ContainsRune(s, '"') {
			builder.WriteByte('"')
			builder.WriteString(strings.ReplaceAll(s, "\"", "\\\""))
			builder.WriteByte('"')
		} else {
			builder.WriteString(s)
		}
	}
	return builder.String()
}

func UniqueAppend(to []string, from ...any) []string {
	exists := make(map[string]struct{}, len(to))
	for _, s := range to {
		exists[s] = struct{}{}
	}
	for _, a := range from {
		s := String(a)
		if _, ok := exists[s]; !ok {
			to = append(to, s)
			exists[s] = struct{}{}
		}
	}
	return to
}

func ArrayToBoolMap[T comparable](arr []T) map[T]bool {
	r := map[T]bool{}
	for _, s := range arr {
		r[s] = true
	}
	return r
}

// ToMap 泛型构建新 Map
func ToMap[K comparable, V any](source any) (map[K]V, error) {
	m := make(map[K]V)
	performRecursiveTo(reflect.ValueOf(source), reflect.ValueOf(m))
	return m, nil
}

// ToSlice 泛型构建新 Slice
func ToSlice[T any](source any) ([]T, error) {
	var s []T
	performRecursiveTo(reflect.ValueOf(source), reflect.ValueOf(&s).Elem())
	return s, nil
}

// FillMap 将 source 填充到目标 map 中
func FillMap(target any, source any) {
	Convert(target, source)
}

// FillSlice 将 source 填充到目标 slice 中
func FillSlice(target any, source any) {
	Convert(target, source)
}

// 补充缺失的 Key 转换工具
func GetLowerName(s string) string {
	if len(s) > 0 && s[0] >= 'A' && s[0] <= 'Z' {
		hasLower := false
		for i := 0; i < len(s); i++ {
			if s[i] >= 'a' && s[i] <= 'z' {
				hasLower = true
				break
			}
		}
		if hasLower {
			return strings.ToLower(s[:1]) + s[1:]
		}
	}
	return s
}

func GetUpperName(s string) string {
	if s == "" {
		return ""
	}
	return strings.ToUpper(s[:1]) + s[1:]
}

// 指针工具
func Ptr[T any](v T) *T { return &v }

// FixUpperCase (保留以支持历史复杂的 Key 转换需求)
func FixUpperCase(data []byte, excludesKeys []string) {
	// 原有逻辑保持
	n := len(data)
	types, keys, tpos := make([]bool, 0), make([]string, 0), -1
	for i := 0; i < n-1; i++ {
		if tpos+1 >= len(types) {
			types = append(types, false)
			keys = append(keys, "")
		}
		switch data[i] {
		case '{':
			tpos++
			types[tpos] = true
			keys[tpos] = ""
		case '}':
			tpos--
		case '[':
			tpos++
			types[tpos] = false
			keys[tpos] = ""
		case ']':
			tpos--
		case '"':
			keyPos := -1
			if i > 0 && (data[i-1] == '{' || (data[i-1] == ',' && tpos >= 0 && types[tpos])) {
				keyPos = i + 1
			}
			i++
			for ; i < n-1; i++ {
				if data[i] == '\\' {
					i++
					continue
				}
				if data[i] == '"' {
					if keyPos >= 0 && len(excludesKeys) > 0 {
						keys[tpos] = string(data[keyPos:i])
					}
					break
				}
			}
			if keyPos >= 0 && (data[keyPos] >= 'A' && data[keyPos] <= 'Z') {
				excluded := false
				if len(excludesKeys) > 0 {
					checkStr := strings.Join(keys[0:tpos+1], ".")
					for _, ek := range excludesKeys {
						if strings.HasSuffix(ek, ".") {
							excluded = strings.HasPrefix(checkStr, ek)
						} else {
							excluded = checkStr == ek
						}
						if excluded {
							break
						}
					}
				}
				if !excluded {
					hasLower := false
					for _, b := range data[keyPos:i] {
						if b >= 'a' && b <= 'z' {
							hasLower = true
							break
						}
					}
					if hasLower {
						data[keyPos] |= 0x20
					}
				}
			}
		}
	}
}