/*
    * Copyright (C) 2012 Atlassian
    *
    * 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 com.atlassian.jira.rest.client.api.domain.input;
  
  import com.atlassian.jira.rest.client.api.domain.BasicUser;
  import com.atlassian.jira.rest.client.api.domain.Visibility;
  import com.atlassian.jira.rest.client.api.domain.Worklog;
  import com.google.common.base.Preconditions;
  import org.joda.time.DateTime;
  
  import java.net.URI;
  
  /**
   * Builder class for WorklogInput. Allows to create new worklogInput instance by using convenient setters.
   * Especially useful are methods to set estimate adjustment options:
   * {@link WorklogInputBuilder#setAdjustEstimateAuto()}, {@link WorklogInputBuilder#setAdjustEstimateLeave()},
   * {@link WorklogInputBuilder#setAdjustEstimateManual(String)} and {@link WorklogInputBuilder#setAdjustEstimateNew(String)}.
   * <br/>
   * If you want ot create new WorklogInput from existing Worklog entity then use
   * {@link WorklogInputBuilder#copyFromWorklog(com.atlassian.jira.rest.client.api.domain.Worklog)} method.
   */
  public class WorklogInputBuilder {
  	public static final String ESTIMATE_UNIT_MINUTES = "m";
  	private URI self;
  	private URI issueUri;
  	private BasicUser author;
  	private BasicUser updateAuthor;
  	private String comment;
  	private DateTime startDate;
  	private int minutesSpent;
  	private Visibility visibility;
  	private WorklogInput.AdjustEstimate adjustEstimate = WorklogInput.AdjustEstimate.AUTO;
  	private String adjustEstimateValue;
  
  	public WorklogInputBuilder(URI issueUri) {
  		Preconditions.checkNotNull(issueUri, "The issueUri cannot be null");
  		this.issueUri = issueUri;
  	}
  
  	@SuppressWarnings("UnusedDeclaration")
  	public WorklogInputBuilder copyFromWorklog(Worklog worklog) {
  		return this
  				.setSelf(worklog.getSelf())
  				.setIssueUri(worklog.getIssueUri())
  				.setAuthor(worklog.getAuthor())
  				.setUpdateAuthor(worklog.getUpdateAuthor())
  				.setComment(worklog.getComment())
  				.setStartDate(worklog.getStartDate())
  				.setMinutesSpent(worklog.getMinutesSpent())
  				.setVisibility(worklog.getVisibility());
  	}
  
  
  	private WorklogInputBuilder setAdjustEstimate(WorklogInput.AdjustEstimate adjustEstimate, String estimateValue) {
  		this.adjustEstimate = adjustEstimate;
  		this.adjustEstimateValue = estimateValue;
  		return this;
  	}
  
  	/**
  	 * Sets AdjustEstimate to NEW - sets estimate to specified value.
  	 *
  	 * @param newEstimate new estimate value to set.<br/>
  	 *                    You can specify a time unit after a time value 'X', such as Xw, Xd, Xh or Xm,
  	 *                    to represent weeks (w), days (d), hours (h) and minutes (m), respectively.<br/>
  	 *                    If you do not specify a time unit, minute will be assumed.
  	 * @return this worklog input builder object
  	 */
  	public WorklogInputBuilder setAdjustEstimateNew(String newEstimate) {
  		return setAdjustEstimate(WorklogInput.AdjustEstimate.NEW, newEstimate);
  	}
  
  	/**
  	 * Sets AdjustEstimate to NEW - sets estimate to specified value.
  	 *
  	 * @param newEstimateMinutes new estimate value to set, in minutes.
  	 * @return this worklog input builder object
  	 */
  	public WorklogInputBuilder setAdjustEstimateNew(int newEstimateMinutes) {
  		return setAdjustEstimate(WorklogInput.AdjustEstimate.NEW, newEstimateMinutes + ESTIMATE_UNIT_MINUTES);
  	}
  
  	/**
  	 * Sets AdjustEstimate to LEAVE - leaves estimate as is.
  	 *
 	 * @return this worklog input builder object
 	 */
 	public WorklogInputBuilder setAdjustEstimateLeave() {
 		return setAdjustEstimate(WorklogInput.AdjustEstimate.LEAVE, null);
 	}
 
 	/**
 	 * Sets AdjustEstimate to MANUAL - reduces remaining estimate by given value.
 	 *
 	 * @param reduceEstimateBy the amount to reduce the remaining estimate by<br/>
 	 *                         You can specify a time unit after a time value 'X', such as Xw, Xd, Xh or Xm,
 	 *                         to represent weeks (w), days (d), hours (h) and minutes (m), respectively.<br/>
 	 *                         If you do not specify a time unit, minute will be assumed.
 	 * @return this worklog input builder object
 	 */
 	public WorklogInputBuilder setAdjustEstimateManual(String reduceEstimateBy) {
 		return setAdjustEstimate(WorklogInput.AdjustEstimate.MANUAL, reduceEstimateBy);
 	}
 
 	/**
 	 * Sets AdjustEstimate to MANUAL - reduces remaining estimate by given value.
 	 *
 	 * @param reduceEstimateByMinutes the amount to reduce the remaining estimate by, in minutes.
 	 * @return this worklog input builder object
 	 */
 	public WorklogInputBuilder setAdjustEstimateManual(int reduceEstimateByMinutes) {
 		return setAdjustEstimate(WorklogInput.AdjustEstimate.MANUAL, reduceEstimateByMinutes + ESTIMATE_UNIT_MINUTES);
 	}
 
 	/**
 	 * Sets AdjustEstimate to AUTO - will automatically adjust the value
 	 * based on the minutes spend specified on the worklog input.<br/>
 	 * This is the default option.
 	 *
 	 * @return this worklog input builder object
 	 */
 	@SuppressWarnings("UnusedDeclaration")
 	public WorklogInputBuilder setAdjustEstimateAuto() {
 		return setAdjustEstimate(WorklogInput.AdjustEstimate.AUTO, null);
 	}
 
 	public WorklogInputBuilder setSelf(URI self) {
 		this.self = self;
 		return this;
 	}
 
 	public WorklogInputBuilder setIssueUri(URI issueUri) {
 		this.issueUri = issueUri;
 		return this;
 	}
 
 	public WorklogInputBuilder setAuthor(BasicUser author) {
 		this.author = author;
 		return this;
 	}
 
 	public WorklogInputBuilder setUpdateAuthor(BasicUser updateAuthor) {
 		this.updateAuthor = updateAuthor;
 		return this;
 	}
 
 	public WorklogInputBuilder setComment(String comment) {
 		this.comment = comment;
 		return this;
 	}
 
 	public WorklogInputBuilder setStartDate(DateTime startDate) {
 		this.startDate = startDate;
 		return this;
 	}
 
 	public WorklogInputBuilder setMinutesSpent(int minutesSpent) {
 		this.minutesSpent = minutesSpent;
 		return this;
 	}
 
 	public WorklogInputBuilder setVisibility(Visibility visibility) {
 		this.visibility = visibility;
 		return this;
 	}
 
 	public WorklogInput build() {
 		return new WorklogInput(self, issueUri, author, updateAuthor, comment, startDate, minutesSpent, visibility, adjustEstimate, adjustEstimateValue);
 	}
 }