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package com.arellomobile.mvp.viewstate.strategy;

import com.arellomobile.mvp.MvpView;
import com.arellomobile.mvp.viewstate.ViewCommand;

import java.util.List;

/**
 * Cautions:
 * 
 *     Don't rearrange current state
 *     Don't insert commands inside existing current state - only put to end of it
 *     Be careful if remove commands by another type. If you make it, be sure that inside your view method you fully override view changes
 * 
 *
 * Date: 17.12.2015
 * Time: 11:21
 *
 * @author Yuri Shmakov
 */
public interface StateStrategy {
	/**
	 * Called immediately after
	 * {@link com.arellomobile.mvp.viewstate.MvpViewState} receive some
	 * command. Will not be called before re-apply to some other
	 * {@link MvpView}
	 *
	 * @param currentState    current state of
	 *                        {@link com.arellomobile.mvp.viewstate.MvpViewState}. Each {@link ViewCommand}
	 *                        contains self parameters.
	 * @param incomingCommand command for apply to {@link MvpView} This
	 *                        {@link ViewCommand} contains params of this command.
	 * @param           type of incoming view
	 */
	 void beforeApply(List> currentState, ViewCommand incomingCommand);

	/**
	 * Called immediately after command applied to {@link MvpView}. Also called
	 * after re-apply to other views.
	 *
	 * @param currentState    current state of
	 *                        {@link com.arellomobile.mvp.viewstate.MvpViewState}. Each {@link ViewCommand}
	 *                        contains self parameters.
	 * @param incomingCommand applied command to {@link MvpView} This
	 *                        {@link ViewCommand} contains params of this command.
	 * @param           type of incoming view
	 */
	 void afterApply(List> currentState, ViewCommand incomingCommand);
}