Implemented MusicBrainz lookup

Wow, what a convoluted api, to say the least...
They have documentation, which is good, but the query syntax definitely
needs more explaining, foremost how to encode non-ASCII characters and
names with whitspaces...

Well, it kinda works, but the Other Albums sections can be waaaaay
off...

5 files changed, 145 insertions, 11 deletions

diff --git a/BeetPlayer.pro b/BeetPlayer.pro
index 0598033..0af8894 100644
--- a/BeetPlayer.pro
+++ b/BeetPlayer.pro
@@ -4,7 +4,7 @@
 #
 #-------------------------------------------------
 
-QT      += core gui multimedia sql
+QT      += core gui multimedia sql network
 QT      += KGlobalAccel KWindowSystem
 
 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
@@ -32,7 +32,8 @@ SOURCES += main.cpp\
     playerwidget.cpp \
     beetview.cpp \
     indexerdialog.cpp \
-    helper.cpp
+    helper.cpp \
+    webdownloader.cpp
 
 HEADERS  += beetplayer.h \
     configurationdialog.h \
@@ -41,7 +42,8 @@ HEADERS  += beetplayer.h \
     playerwidget.h \
     beetview.h \
     indexerdialog.h \
-    helper.h
+    helper.h \
+    webdownloader.h
 
 LIBS += -ltag
 
diff --git a/playerwidget.cpp b/playerwidget.cpp
index c00db32..6eb5821 100644
--- a/playerwidget.cpp
+++ b/playerwidget.cpp
@@ -3,6 +3,7 @@
 #include <QPushButton>
 #include <QLabel>
 #include <QTextEdit>
+#include <QTextBrowser>
 #include <QSlider>
 #include <QTreeView>
 #include <QSplitter>
@@ -35,11 +36,14 @@
 #include "indexerdialog.h"
 #include "globals.h"
 #include "helper.h"
+#include "webdownloader.h"
 
 PlayerWidget::PlayerWidget(QWidget *parent) : QWidget(parent), mDurSecs(0), mPlayListLength(0){
     mStarting = true;
     setupGui();
     createActions();
+    mWebDownloader = new WebDownloader(this);
+    connect(mWebDownloader, &WebDownloader::done, this, &PlayerWidget::webDlDone);
     mStarting = false;
 }
 
@@ -203,7 +207,8 @@ void PlayerWidget::setupGui(){
     //misc info
     QString leftInfoGBS = QString(tr("%1 Misc. %1")).arg(QChar(0x26A5));
     QGroupBox *leftInfoGB = new QGroupBox(leftInfoGBS);
-    mLeftTE = new QTextEdit;
+    mLeftTE = new QTextBrowser;
+    mLeftTE->setOpenExternalLinks(true);
     mLeftTE->setFont(QFont("courier"));
     mLeftTE->setReadOnly(true);
     QVBoxLayout *leftInfoL = new QVBoxLayout;
@@ -354,8 +359,10 @@ void PlayerWidget::createActions(){
     helpA->setMenu(helpM);
     QAction *miscPrintA = new QAction(QIcon(":/clean_tampon.png"), tr("List selected"), this);
     connect(miscPrintA, &QAction::triggered, this, &PlayerWidget::printList);
-    QAction *miscMusicBrainzA = new QAction(QIcon(":/bizarre_amputee.png"), tr("Search Musicbrainz"), this);
-    connect(miscMusicBrainzA, &QAction::triggered, this, &PlayerWidget::searchMusicbrainz);
+    QAction *miscMusicBrainzRightA = new QAction(QIcon(":/bizarre_amputee.png"), tr("Search Musicbrainz"), this);
+    connect(miscMusicBrainzRightA, &QAction::triggered, this, &PlayerWidget::searchMusicbrainzRight);
+    QAction *miscMusicBrainzLeftA = new QAction(QIcon(":/bizarre_amputee.png"), tr("Search Musicbrainz"), this);
+    connect(miscMusicBrainzLeftA, &QAction::triggered, this, &PlayerWidget::searchMusicbrainzLeft);
     mView->addAction(addToPlayListA);
     mView->addAction(addToPlayListAndClearA);
     mView->addAction(Helper::createSeparator(this));
@@ -367,13 +374,14 @@ void PlayerWidget::createActions(){
     mView->addAction(mDeleteFilesA);
     mView->addAction(Helper::createSeparator(this));
     mView->addAction(miscPrintA);
+    mView->addAction(miscMusicBrainzLeftA);
     mView->addAction(Helper::createSeparator(this));
     mView->addAction(mRefreshA);
     mView->addAction(Helper::createSeparator(this));
     mView->addAction(randomPlayA);
     mPlayListView->addAction(removeFromPlayListA);
     mPlayListView->addAction(Helper::createSeparator(this));
-    mPlayListView->addAction(miscMusicBrainzA);
+    mPlayListView->addAction(miscMusicBrainzRightA);
     mPlayListView->addAction(Helper::createSeparator(this));
     mPlayListView->addAction(shufflePlayistA);
     mPlayListView->addAction(clearPlayListA);
@@ -959,6 +967,8 @@ void PlayerWidget::addSong(const QModelIndex &idx){
         len = Helper::lengthInSeconds(idx.data(FullPathRole).toString());
     }
     item->setData(len, LengthRole);
+    item->setData(artist, ArtistRole);
+    item->setData(album, AlbumRole);
     root->appendRow(item);
     mPlayListLength += len;
 }
@@ -1179,6 +1189,8 @@ void PlayerWidget::randomPlay(){
         item->setIcon(songIcon);
         item->setData(randomQ.value(2), FullPathRole);
         item->setData(randomQ.value(6), LengthRole);
+        item->setData(randomQ.value(4), ArtistRole);
+        item->setData(randomQ.value(5), AlbumRole);
         mPlayListLength += randomQ.value(6).toInt();
         root->appendRow(item);
     }
@@ -1213,11 +1225,45 @@ void PlayerWidget::printList(){
             output.append(t);
         }
     }
-    mLeftTE->setText(output);
+    mLeftTE->clear();
+    mLeftTE->setPlainText(output);
 }
 
-void PlayerWidget::searchMusicbrainz(){
+void PlayerWidget::searchMusicbrainzRight(){
+    QModelIndex idx = mPlayListView->selectionModel()->currentIndex();
+    if(!idx.isValid()){
+        return;
+    }
+    QString artist = idx.data(ArtistRole).toString();
+    QString album = idx.data(AlbumRole).toString();
+    mWebDownloader->fetchData(artist, album);
+}
+
+void PlayerWidget::searchMusicbrainzLeft(){
+    QModelIndex idx = mView->selectionModel()->currentIndex();
+    if(!idx.isValid()){
+        return;
+    }
+    QString artist = idx.data(ArtistRole).toString().toLower();
+    QString album = idx.data(AlbumRole).toString().toLower();
+    mWebDownloader->fetchData(artist, album);
+}
 
+
+void PlayerWidget::webDlDone(){
+    QString text(tr("<b>Musicbrainz:</b><ul>"));
+    text.append(QString(tr("<li>Artist: %1</li>")).arg(mWebDownloader->artist()));
+    text.append(QString(tr("<li>Album: %1</li>")).arg(mWebDownloader->album()));
+    foreach(QString rg, mWebDownloader->data()){
+        text.append(QString("<li><a href=\"https://musicbrainz.org/release-group/%1\">%1</a></li>").arg(rg));
+    }
+    text.append("</ul>");
+    text.append(tr("<b>Other Albums</b><ul>"));
+    for(QMap<QString, QString>::const_iterator it = mWebDownloader->otherData().constBegin(); it != mWebDownloader->otherData().constEnd(); ++it){
+        text.append(QString("<li><a href=\"https://musicbrainz.org/release-group/%1\">%2</a></li>").arg(it.value()).arg(it.key()));
+    }
+    text.append("</ul>");
+    mLeftTE->setText(text);
 }
 
 void PlayerWidget::play(const QString &fullPath){
diff --git a/playerwidget.h b/playerwidget.h
index ad58ea4..738b72e 100644
--- a/playerwidget.h
+++ b/playerwidget.h
@@ -13,6 +13,7 @@ class QLineEdit;
 class QLabel;
 class QSlider;
 class QTextEdit;
+class QTextBrowser;
 class QMediaPlayer;
 class QToolBar;
 class QAction;
@@ -21,6 +22,7 @@ class QStackedLayout;
 class BeetPlayerProxy;
 class BeetView;
 class QSystemTrayIcon;
+class WebDownloader;
 
 class PlayerWidget : public QWidget {
     Q_OBJECT
@@ -65,7 +67,9 @@ class PlayerWidget : public QWidget {
         void randomPlay();
         void playCurrent(const QModelIndex &index);
         void printList();
-        void searchMusicbrainz();
+        void searchMusicbrainzRight();
+        void searchMusicbrainzLeft();
+        void webDlDone();
 
         void mute(bool triggered);
         void volumeChanged(int volume);
@@ -117,7 +121,7 @@ class PlayerWidget : public QWidget {
         QSlider *mVolumeSlider;
         QLabel *mVolumePos;
         QTextEdit *mCurrentTE;
-        QTextEdit *mLeftTE;
+        QTextBrowser *mLeftTE;
         QTextEdit *mRightTE;
         BeetView *mPlayListView;
         QStandardItemModel *mPlayListModel;
@@ -140,6 +144,7 @@ class PlayerWidget : public QWidget {
         QTimer *mVolumeTimer;
         bool mStarting;
         QStackedLayout *mSearchDirStack;
+        WebDownloader *mWebDownloader;
 };
 
 #endif // PLAYERWIDGET_H
diff --git a/webdownloader.cpp b/webdownloader.cpp
new file mode 100644
index 0000000..8035fe1
--- /dev/null
+++ b/webdownloader.cpp
@@ -0,0 +1,49 @@
+#include <QNetworkReply>
+#include <QNetworkRequest>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QJsonArray>
+
+#include "webdownloader.h"
+
+WebDownloader::WebDownloader(QObject *parent) : QObject(parent) {
+    mAccessMgr = new QNetworkAccessManager(this);
+    connect(mAccessMgr, &QNetworkAccessManager::finished, this, &WebDownloader::dlFinished);
+}
+
+void WebDownloader::fetchData(QString artist, QString album){
+    mArtist = artist;
+    mAlbum = album;
+    QString artistQ = QString("artist:\"%1\"").arg(artist);
+    QByteArray peq = QUrl::toPercentEncoding(artistQ);
+    QString url = QString("https://musicbrainz.org/ws/2/release/?query=%1&fmt=json&limit=100").arg(QString(peq));
+    QUrl aUrl(url);
+    QNetworkRequest req(aUrl);
+    req.setHeader(QNetworkRequest::UserAgentHeader, "Beetplayer/1.0.0 (beetplayer@d-tor.org");
+    mAccessMgr->get(req);
+}
+
+void WebDownloader::dlFinished(QNetworkReply *reply){
+    mData.clear();
+    mOtherData.clear();
+    QByteArray res = reply->readAll();
+    QJsonParseError err;
+    QJsonDocument jDoc = QJsonDocument::fromJson(res, &err);
+    QJsonObject docObj = jDoc.object();
+    QJsonArray relArr = docObj.value("releases").toArray();
+    for(QJsonArray::const_iterator it = relArr.constBegin(); it != relArr.constEnd(); ++it){
+        QJsonValue v = *it;
+        QString title = v.toObject().value("title").toString().toLower();
+        QString curId = v.toObject().value("release-group").toObject().value("id").toString();
+        qDebug() << mAlbum << title;
+        if(mAlbum == title){
+            if(!mData.contains(curId)){
+                mData << curId;
+            }
+        }else{
+            mOtherData.insert(title, curId);
+        }
+    }
+    reply->deleteLater();
+    emit done();
+}
diff --git a/webdownloader.h b/webdownloader.h
new file mode 100644
index 0000000..522ec86
--- /dev/null
+++ b/webdownloader.h
@@ -0,0 +1,32 @@
+#ifndef WEBDOWNLOADER_H
+#define WEBDOWNLOADER_H
+
+#include <QObject>
+#include <QNetworkAccessManager>
+#include <QMap>
+
+class WebDownloader : public QObject {
+    Q_OBJECT
+    public:
+        WebDownloader(QObject *parent = 0);
+        void fetchData(QString artist, QString album);
+        const QString album() const { return mAlbum; }
+        const QString artist() const { return mArtist; }
+        const QStringList data() const { return mData; }
+        const QMap<QString, QString> otherData() const { return mOtherData; }
+
+    signals:
+        void done();
+
+    private slots:
+        void dlFinished(QNetworkReply *reply);
+
+    private:
+        QNetworkAccessManager *mAccessMgr;
+        QString mArtist;
+        QString mAlbum;
+        QStringList mData;
+        QMap<QString, QString> mOtherData;
+};
+
+#endif // WEBDOWNLOADER_H