package carbon

// Closest returns the closest Carbon instance from the given Carbon instance.
// 返回离给定 carbon 实例最近的 Carbon 实例
func (c Carbon) Closest(c1 Carbon, c2 Carbon) Carbon {
	if c1.Error != nil {
		return c2
	}
	if c2.Error != nil {
		return c1
	}
	if c.DiffAbsInSeconds(c1) < c.DiffAbsInSeconds(c2) {
		return c1
	}
	return c2
}

// Farthest returns the farthest Carbon instance from the given Carbon instance.
// 返回离给定 carbon 实例最远的 Carbon 实例
func (c Carbon) Farthest(c1 Carbon, c2 Carbon) Carbon {
	if c1.IsZero() || c1.IsInvalid() {
		return c2
	}
	if c2.IsZero() || c2.IsInvalid() {
		return c1
	}
	if c.DiffAbsInSeconds(c1) > c.DiffAbsInSeconds(c2) {
		return c1
	}
	return c2
}

// Max returns the maximum Carbon instance from the given Carbon instance (second-precision).
// 返回最大的 Carbon 实例
func Max(c1 Carbon, c2 ...Carbon) (c Carbon) {
	c = c1
	for i := range c2 {
		if c2[i].Gte(c) {
			c = c2[i]
		}
	}
	return
}

// Min returns the minimum Carbon instance from the given Carbon instance (second-precision).
// 返回最小的 Carbon 实例
func Min(c1 Carbon, c2 ...Carbon) (c Carbon) {
	c = c1
	for i := range c2 {
		if c2[i].Lte(c) {
			c = c2[i]
		}
	}
	return
}