package convx

import (
	"errors"
	"fmt"
	"strconv"
)

// interface 转 string
func ToString(val interface{}) (str string, err error) {

	switch v := val.(type) {
	case nil:
		return "", fmt.Errorf("can not convert to string")
	case string:
		return v, nil
	case int:
		return strconv.Itoa(v), nil
	case int8:
		return strconv.FormatInt(int64(v), 10), nil
	case int16:
		return strconv.FormatInt(int64(v), 10), nil
	case int32:
		return strconv.FormatInt(int64(v), 10), nil
	case int64:
		return strconv.FormatInt(v, 10), nil
	case float32:
		return strconv.FormatFloat(float64(v), 'f', -1, 32), nil
	case float64:
		return strconv.FormatFloat(v, 'f', -1, 64), nil
	case bool:
		return strconv.FormatBool(v), nil
	case uint:
		return strconv.FormatUint(uint64(v), 10), nil
	case uint8:
		return strconv.FormatUint(uint64(v), 10), nil
	case uint16:
		return strconv.FormatUint(uint64(v), 10), nil
	case uint32:
		return strconv.FormatUint(uint64(v), 10), nil
	case uint64:
		return strconv.FormatUint(v, 10), nil
	}

	return "", errors.New("can not convert to string")
}