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/*
* Copyright 2013 Jesse Morgan
*/
package com.p4square.grow.model;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.annotation.JsonIgnore;
/**
* Representation of a user's playlist.
*
* @author Jesse Morgan <jesse@jesterpm.net>
*/
public class Playlist {
/**
* Map of Chapter ID to map of Video ID to VideoRecord.
*/
private Map<Chapters, Chapter> mPlaylist;
private Date mLastUpdated;
/**
* Construct an empty playlist.
*/
public Playlist() {
mPlaylist = new HashMap<>();
mLastUpdated = new Date(0); // Default to a prehistoric date if we don't have one.
}
/**
* Find the VideoRecord for a video id.
*/
public VideoRecord find(String videoId) {
for (Chapter chapter : mPlaylist.values()) {
VideoRecord r = chapter.getVideoRecord(videoId);
if (r != null) {
return r;
}
}
return null;
}
/**
* @param videoId The video to search for.
* @return the Chapter containing videoId.
*/
private Chapter findChapter(String videoId) {
for (Chapter chapter : mPlaylist.values()) {
VideoRecord r = chapter.getVideoRecord(videoId);
if (r != null) {
return chapter;
}
}
return null;
}
/**
* @return The last modified date of the source playlist.
*/
public Date getLastUpdated() {
return mLastUpdated;
}
/**
* Set the last updated date.
* @param date the new last updated date.
*/
public void setLastUpdated(Date date) {
mLastUpdated = date;
}
/**
* Add a video to the playlist.
*/
public VideoRecord add(Chapters chapterId, String videoId) {
Chapter chapter = mPlaylist.get(chapterId);
if (chapter == null) {
chapter = new Chapter(chapterId);
mPlaylist.put(chapterId, chapter);
}
VideoRecord r = new VideoRecord();
chapter.setVideoRecord(videoId, r);
return r;
}
/**
* Add a Chapter to the Playlist.
* @param chapterId The name of the chapter.
* @param chapter The Chapter object to add.
*/
public void addChapter(Chapters chapterId, Chapter chapter) {
chapter.setName(chapterId);
mPlaylist.put(chapterId, chapter);
}
/**
* Variation of addChapter() with a String key for Jackson.
*/
@JsonAnySetter
private void addChapter(String chapterName, Chapter chapter) {
addChapter(Chapters.fromString(chapterName), chapter);
}
/**
* @return a map of chapter id to chapter.
*/
@JsonAnyGetter
public Map<Chapters, Chapter> getChaptersMap() {
return mPlaylist;
}
/**
* @return The last chapter to be completed.
*/
@JsonIgnore
public Map<Chapters, Boolean> getChapterStatuses() {
Map<Chapters, Boolean> completed = new HashMap<>();
for (Map.Entry<Chapters, Chapter> entry : mPlaylist.entrySet()) {
completed.put(entry.getKey(), entry.getValue().isComplete());
}
return completed;
}
/**
* @return true if all required videos in the chapter have been watched.
*/
public boolean isChapterComplete(Chapters chapterId) {
Chapter chapter = mPlaylist.get(chapterId);
if (chapter != null) {
return chapter.isComplete();
}
return false;
}
/**
* Merge a playlist into this playlist.
*
* Merge is accomplished by adding all missing Chapters and VideoRecords to
* this playlist.
*
* Additionally,
* * any "required" videos that are only present in this playlist are
* marked as "not required".
* * any new "required" videos in a completed chapter are marked as
* "not required".
*/
public void merge(Playlist source) {
if (source.getLastUpdated().before(mLastUpdated)) {
// Already up to date.
return;
}
for (Map.Entry<Chapters, Chapter> entry : source.getChaptersMap().entrySet()) {
Chapters chapterName = entry.getKey();
Chapter theirChapter = entry.getValue();
Chapter myChapter = mPlaylist.get(entry.getKey());
if (myChapter == null) {
// Add new chapter
myChapter = new Chapter(chapterName);
addChapter(chapterName, myChapter);
}
// If my chapter is already complete, no new videos will be required.
boolean myChapterComplete = true;
for (Map.Entry<String, VideoRecord> videoEntry : myChapter.getVideos().entrySet()) {
VideoRecord myVideo = videoEntry.getValue();
myChapterComplete &= (myVideo.getComplete() || !myVideo.getRequired());
// Mark all existing, uncompleted videos as not required.
// We'll mark them as required again if they are required in the new playlist.
myVideo.setRequired(myVideo.getRequired() && myVideo.getComplete());
}
// Check chapter for missing videos
for (Map.Entry<String, VideoRecord> videoEntry : theirChapter.getVideos().entrySet()) {
String videoId = videoEntry.getKey();
VideoRecord myVideo = myChapter.getVideoRecord(videoId);
if (myVideo == null) {
myVideo = find(videoId);
if (myVideo == null) {
// New Video
try {
myVideo = videoEntry.getValue().clone();
myChapter.setVideoRecord(videoId, myVideo);
if (myChapterComplete) {
myVideo.setRequired(false);
}
} catch (CloneNotSupportedException e) {
throw new RuntimeException(e); // Unexpected...
}
} else {
// Video moved
findChapter(videoId).removeVideoRecord(videoId);
myChapter.setVideoRecord(videoId, myVideo);
}
} else {
// Copy the required property from the newer video.
// However, like new videos, newly required videos aren't applied to completed
// chapters.
if (!myChapterComplete) {
myVideo.setRequired(videoEntry.getValue().getRequired());
}
}
}
}
mLastUpdated = source.getLastUpdated();
}
}
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