package convx

import (
	"errors"
	"strconv"
)

// interface 转 int64
func ToInt64(val interface{}) (i int64, err error) {

	if v, ok := val.(int64); ok {
		i = v
	} else if v, ok := val.(int32); ok {
		i = int64(v)
	} else if v, ok := val.(string); ok {
		// string 转 int64
		// 第二个参数为基数（2~36），第三个参数位大小表示期望转换的结果类型，其值可以为0, 8, 16, 32和64，分别对应 int, int8, int16, int32和int64
		i, err = strconv.ParseInt(v, 10, 64)
	} else if v, ok := val.(float64); ok {
		i = int64(v)
	} else if v, ok := val.(float32); ok {
		i = int64(v)
	} else if v, ok := val.(int); ok {
		i = int64(v)
	} else if v, ok := val.(uint); ok {
		i = int64(v)
	} else if v, ok := val.(uint32); ok {
		i = int64(v)
	} else if v, ok := val.(uint64); ok {
		i = int64(v)
	} else if v, ok := val.(bool); ok {
		if v {
			i = 1
		} else {
			i = 0
		}
	} else {
		err = errors.New("不支持的参数类型")
	}
	return
}