package com.github.dexecutor.core;
   
   import static com.github.dexecutor.core.support.Preconditions.*;
   
   public class ExecutionConfig {
   
   	private ExecutionBehavior executionBehavior;
   	private int retryCount = 0;
   	private Duration retryDelay = Duration.MINIMAL_DURATION; 
  
  	public static final ExecutionConfig TERMINATING = new ExecutionConfig().terminating();
  	public static final ExecutionConfig NON_TERMINATING = new ExecutionConfig().nonTerminating();
  	
  	/**
  	 * 
  	 * @return {@ ExecutionConfig} representing non-terminating execution behaivor
  	 */
  	public ExecutionConfig nonTerminating() {
  		this.executionBehavior = ExecutionBehavior.NON_TERMINATING;
  		return this;
  	}
  	
  	/**
  	 * 
  	 * @return {@ ExecutionConfig} representing terminating execution behaivor
  	 */
  	public ExecutionConfig terminating() {
  		this.executionBehavior = ExecutionBehavior.TERMINATING;
  		return this;
  	}
  	
  	/**
  	 * 
  	 * @return {@ ExecutionConfig} representing immediate retry execution behaivor
  	 */
  	public ExecutionConfig immediateRetrying(int count) {
  		this.executionBehavior = ExecutionBehavior.IMMEDIATE_RETRY_TERMINATING;
  		this.retryCount = count;
  		return this;
  	}
  	
  	/**
  	 * 
  	 * @return {@ ExecutionConfig} representing scheduled retry terminating execution behaivor
  	 */
  	public ExecutionConfig scheduledRetrying(int count, Duration delay) {
  		this.executionBehavior = ExecutionBehavior.SCHEDULED_RETRY_TERMINATING;
  		this.retryCount = count;
  		this.retryDelay = delay;
  		return this;
  	}
  	/**
  	 * 
  	 * @return the execution behavior
  	 */
  	public ExecutionBehavior getExecutionBehavior() {
  		return executionBehavior;
  	}
  	/**
  	 * 
  	 * @return the retry count
  	 */
  	public int getRetryCount() {
  		return retryCount;
  	}
  	/**
  	 * 
  	 * @return the retry delay
  	 */
  	public Duration getRetryDelay() {
  		return retryDelay;
  	}
  
  	/**
  	 * 
  	 * @return {@true} if the {@ExecutionBehavior} is TERMINATING
  	 * 			{@false} otherwise
  	 */
  	public boolean isTerminating() {
  		return ExecutionBehavior.TERMINATING.equals(this.executionBehavior);
  	}
  	/**
  	 * 
  	 * @return {@true} if the {@ExecutionBehavior} is NON_TERMINATING
  	 * 			{@false} otherwise
  	 */
  	public boolean isNonTerminating() {
  		return ExecutionBehavior.NON_TERMINATING.equals(this.executionBehavior);
  	}
  	/**
  	 * 
  	 * @return {@true} if the {@ExecutionBehavior} is IMMEDIATE_RETRY_TERMINATING
  	 * 			{@false} otherwise
  	 */
  	public boolean isImmediatelyRetrying() {
  		return ExecutionBehavior.IMMEDIATE_RETRY_TERMINATING.equals(this.executionBehavior);
  	}
  	
  	/**
 	 * 
 	 * @return {@true} if the {@ExecutionBehavior} is SCHEDULED_RETRY_TERMINATING
 	 * 			{@false} otherwise
 	 */
 	public boolean isScheduledRetrying() {
 		return ExecutionBehavior.SCHEDULED_RETRY_TERMINATING.equals(this.executionBehavior);
 	}
 	/**
 	 * 
 	 * @param currentCount
 	 * @return {@true} if a retry should be attempted, based on current retries already happened.
 	 * 			{@false} otherwise
 	 */
 	public boolean shouldRetry(int currentCount) {
 		return this.retryCount != 0 && this.retryCount > currentCount;
 	}
 	/**
 	 * Does basic validation to make sure object is valid
 	 */
 	public void validate() {
 		if (isScheduledRetrying()) {
 			checkNotNull(this.retryDelay, "retryDelay should be specified for " + ExecutionBehavior.SCHEDULED_RETRY_TERMINATING);
 			checkArgument(this.getRetryDelay().getDuration() > 0, "Retry delay duration should be greater than ZERO");
 		}
 	}
 }