// ------------------------------------------------------------------------
//   Project atila
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  date_days_range.go
//   Created by DEV
//   Modified   21/02/2024
//
//   Copyright 2024 activething.com 
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------

package times

type (

	DateDaysRange 	struct {
		Start 		DateDays
		End   		DateDays
	}


	DateDaysRangeFnc func(daysRange *DateDaysRange)
)

func NewDateRange (options ...DateDaysRangeFnc) *DateDaysRange {
	dr := &DateDaysRange{}
	for _,o := range options {
		o(dr)
	}
	return dr
}





func (r DateDaysRange) IsZero () bool {
	return r.End-r.Start <= 0 }


func (r DateDaysRange) Size   () DateDays {
	return DateDays(r.End -r.Start) }


func (r DateDaysRange) Contains (days DateDays) bool {
	if r.IsZero() {
		return false }
	return r.Start < days && r.End > days
}


func (r DateDaysRange) ContainsRange (drange DateDaysRange) bool {
	if r.IsZero() {
		return false }
	return r.Start > drange.Start && r.End < drange.End
}


func (r DateDaysRange) IsRangeOverlap (drange DateDaysRange) bool {
	if r.IsZero() {
		return false }
	if r.Start == drange.Start || r.Start == drange.End || r.End == drange.End {
		return true }
	if r.Start > drange.Start {
		return drange.End < r.End
	}
	return r.End > drange.Start
}


/*
   ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

   I HAVE NO DESIRE TO WALK ON WATER," SAID SIDDHARTA.
   "LET THE OLD SHRAMANAS SATISFY THEMSELVES WITH SUCH SKILLS.

   SIDDHARTA
   - HERMANN HESSE -

   :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

*/