/*
 * Copyright 2011 gitblit.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 com.gitblit.models;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.revwalk.RevCommit;

import com.gitblit.utils.TimeUtils;

/**
 * Model class to represent the commit activity across many repositories. This
 * class is used by the Activity page.
 * 
 * @author James Moger
 */
public class Activity implements Serializable, Comparable<Activity> {

	private static final long serialVersionUID = 1L;

	public final Date startDate;

	public final Date endDate;

	private final Set<RepositoryCommit> commits;

	private final Map<String, Metric> authorMetrics;

	private final Map<String, Metric> repositoryMetrics;

	/**
	 * Constructor for one day of activity.
	 * 
	 * @param date
	 */
	public Activity(Date date) {
		this(date, TimeUtils.ONEDAY - 1);
	}

	/**
	 * Constructor for specified duration of activity from start date.
	 * 
	 * @param date
	 *            the start date of the activity
	 * @param duration
	 *            the duration of the period in milliseconds
	 */
	public Activity(Date date, long duration) {
		startDate = date;
		endDate = new Date(date.getTime() + duration);
		commits = new LinkedHashSet<RepositoryCommit>();
		authorMetrics = new HashMap<String, Metric>();
		repositoryMetrics = new HashMap<String, Metric>();
	}

	/**
	 * Adds a commit to the activity object as long as the commit is not a
	 * duplicate.
	 * 
	 * @param repository
	 * @param branch
	 * @param commit
	 * @return a RepositoryCommit, if one was added. Null if this is duplicate
	 *         commit
	 */
	public RepositoryCommit addCommit(String repository, String branch, RevCommit commit) {
		RepositoryCommit commitModel = new RepositoryCommit(repository, branch, commit);
		if (commits.add(commitModel)) {
			if (!repositoryMetrics.containsKey(repository)) {
				repositoryMetrics.put(repository, new Metric(repository));
			}
			repositoryMetrics.get(repository).count++;

			String author = commit.getAuthorIdent().getEmailAddress()
					.toLowerCase();
			if (!authorMetrics.containsKey(author)) {
				authorMetrics.put(author, new Metric(author));
			}
			authorMetrics.get(author).count++;
			return commitModel;
		}
		return null;
	}
	
	public int getCommitCount() {
		return commits.size();
	}
	
	public List<RepositoryCommit> getCommits() {
		List<RepositoryCommit> list = new ArrayList<RepositoryCommit>(commits);
		Collections.sort(list);
		return list;
	}

	public Map<String, Metric> getAuthorMetrics() {
		return authorMetrics;
	}

	public Map<String, Metric> getRepositoryMetrics() {
		return repositoryMetrics;
	}

	@Override
	public int compareTo(Activity o) {
		// reverse chronological order
		return o.startDate.compareTo(startDate);
	}

	/**
	 * Model class to represent a RevCommit, it's source repository, and the
	 * branch. This class is used by the activity page.
	 * 
	 * @author James Moger
	 */
	public static class RepositoryCommit implements Serializable, Comparable<RepositoryCommit> {

		private static final long serialVersionUID = 1L;

		public final String repository;

		public final String branch;

		private final RevCommit commit;

		private List<RefModel> refs;

		public RepositoryCommit(String repository, String branch, RevCommit commit) {
			this.repository = repository;
			this.branch = branch;
			this.commit = commit;
		}

		public void setRefs(List<RefModel> refs) {
			this.refs = refs;
		}

		public List<RefModel> getRefs() {
			return refs;
		}

		public String getName() {
			return commit.getName();
		}

		public String getShortName() {
			return commit.getName().substring(0, 8);
		}

		public String getShortMessage() {
			return commit.getShortMessage();
		}

		public int getParentCount() {
			return commit.getParentCount();
		}

		public PersonIdent getAuthorIdent() {
			return commit.getAuthorIdent();
		}

		public PersonIdent getCommitterIdent() {
			return commit.getCommitterIdent();
		}

		@Override
		public boolean equals(Object o) {
			if (o instanceof RepositoryCommit) {
				RepositoryCommit commit = (RepositoryCommit) o;
				return repository.equals(commit.repository) && getName().equals(commit.getName());
			}
			return false;
		}
		
		@Override
		public int hashCode() {
			return (repository + commit).hashCode();
		}

		@Override
		public int compareTo(RepositoryCommit o) {
			// reverse-chronological order
			if (commit.getCommitTime() > o.commit.getCommitTime()) {
				return -1;
			} else if (commit.getCommitTime() < o.commit.getCommitTime()) {
				return 1;
			}
			return 0;
		}
	}
}