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/*
 * Copyright © 2020 XDEV Software (https://xdev.software)
 *
 * 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 software.xdev.vaadin.daterange_picker.business;

import java.time.LocalDate;
import java.time.Period;
import java.util.Optional;
import java.util.function.BiFunction;
import java.util.function.Function;

/**
 * Basic implementation of {@link DateRange}
 *
 * @param  implementer
 */
@SuppressWarnings("java:S119")
public abstract class AbstractDateRange> implements DateRange
{
	private String key;
	private Optional optMovePeriod = Optional.empty();
	private String defaultDesc;
	private Function> calcForFunc;
	private BiFunction> moveFunc = (date, count) ->
	{
		if(this.optMovePeriod.isEmpty())
		{
			return Optional.empty();
		}
		
		return this.calcForFunc.apply(count != 0 ? date.plus(this.optMovePeriod.get().multipliedBy(count)) : date);
	};
	private boolean movable = true;
	private boolean calcable = true;
	private boolean setable = true;
		
	@SuppressWarnings("unchecked")
	public SELF self()
	{
		return (SELF)this;
	}
	
	// -- CONFIGURE
	public SELF withKey(final String key)
	{
		this.key = key;
		return this.self();
	}
	
	public SELF withMovePeriod(final Period period)
	{
		this.optMovePeriod = Optional.ofNullable(period);
		return this.self();
	}
	
	public SELF withDefaultDesc(final String defaultDesc)
	{
		this.defaultDesc = defaultDesc;
		return this.self();
	}
	
	public SELF withCalcForFunc(final Function calcForFunc)
	{
		return this.withOptCalcForFunc(date -> Optional.ofNullable(calcForFunc.apply(date)));
	}
	
	public SELF withOptCalcForFunc(final Function> calcForFunc)
	{
		this.calcForFunc = calcForFunc;
		return this.self();
	}
	
	public SELF withMoveFunc(final BiFunction> moveFunc)
	{
		this.moveFunc = moveFunc;
		return this.self();
	}
	
	public SELF withMovable(final boolean movable)
	{
		this.movable = movable;
		return this.self();
	}
	
	public SELF withCalcable(final boolean calcable)
	{
		this.calcable = calcable;
		return this.self();
	}
	
	public SELF withSettable(final boolean settable)
	{
		this.setable = settable;
		return this.self();
	}
	
	public SELF from(final AbstractDateRange dateRange)
	{
		this.key = dateRange.getKey();
		this.optMovePeriod = dateRange.getOptMovePeriod();
		this.defaultDesc = dateRange.getDefaultDescription();
		this.calcForFunc = dateRange.getCalcForFunc();
		this.moveFunc = dateRange.getMoveFunc();
		this.movable = dateRange.isMovable();
		this.calcable = dateRange.isCalcable();
		this.setable = dateRange.isSettable();
		
		return this.self();
	}
	
	// -- GETTER
	
	@Override
	public String getKey()
	{
		return this.key;
	}
	
	@Override
	public Optional getOptMovePeriod()
	{
		return this.optMovePeriod;
	}
	
	@Override
	public String getDefaultDescription()
	{
		return this.defaultDesc;
	}
	
	@Override
	public boolean isMovable()
	{
		return this.movable && this.isCalcable();
	}
	
	@Override
	public boolean isCalcable()
	{
		return this.calcable;
	}
	
	@Override
	public boolean isSettable()
	{
		return this.setable;
	}

	public Function> getCalcForFunc()
	{
		return this.calcForFunc;
	}

	public BiFunction> getMoveFunc()
	{
		return this.moveFunc;
	}

	@Override
	public Optional calcFor(final LocalDate date)
	{
		if(!this.isCalcable())
		{
			return Optional.empty();
		}
		return this.calcForFunc.apply(date);
	}
	
	@Override
	public Optional moveDateRange(final LocalDate date, final int dif)
	{
		if(!this.isMovable())
		{
			return Optional.empty();
		}
		return this.moveFunc.apply(date, dif);
	}
		
}