/* This file is part of Clementine.
   Copyright 2010, David Sansome <me@davidsansome.com>

   Clementine is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Clementine is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "transcodedialog.h"
#include "transcoder.h"
#include "ui_transcodedialog.h"
#include "ui_transcodelogdialog.h"
#include "ui/mainwindow.h"

#include <QPushButton>
#include <QFileDialog>
#include <QSettings>
#include <QDateTime>

// winspool.h defines this :(
#ifdef AddJob
#  undef AddJob
#endif

const char* TranscodeDialog::kSettingsGroup = "Transcoder";
const int TranscodeDialog::kProgressInterval = 500;

static bool ComparePresetsByName(const TranscoderPreset& left,
                                 const TranscoderPreset& right) {
  return left.name_ < right.name_;
}


TranscodeDialog::TranscodeDialog(QWidget *parent)
  : QDialog(parent),
    ui_(new Ui_TranscodeDialog),
    log_ui_(new Ui_TranscodeLogDialog),
    log_dialog_(new QDialog(this)),
    transcoder_(new Transcoder(this)),
    queued_(0),
    finished_success_(0),
    finished_failed_(0)
{
  ui_->setupUi(this);
  ui_->files->header()->setResizeMode(QHeaderView::ResizeToContents);

  log_ui_->setupUi(log_dialog_);

  // Get presets
  QList<TranscoderPreset> presets = Transcoder::GetAllPresets();
  qSort(presets.begin(), presets.end(), ComparePresetsByName);
  foreach (const TranscoderPreset& preset, presets) {
    ui_->format->addItem(
        QString("%1 (.%2)").arg(preset.name_, preset.extension_),
        QVariant::fromValue(preset));
  }

  // Load settings
  QSettings s;
  s.beginGroup(kSettingsGroup);
  last_add_dir_ = s.value("last_add_dir", QDir::homePath()).toString();

  QString last_output_format = s.value("last_output_format", "ogg").toString();
  for (int i=0 ; i<ui_->format->count() ; ++i) {
    if (last_output_format ==
        ui_->format->itemData(i).value<TranscoderPreset>().extension_) {
      ui_->format->setCurrentIndex(i);
      break;
    }
  }

  // Add a start button
  start_button_ = ui_->button_box->addButton(
      tr("Start transcoding"), QDialogButtonBox::ActionRole);
  cancel_button_ = ui_->button_box->button(QDialogButtonBox::Cancel);
  close_button_ = ui_->button_box->button(QDialogButtonBox::Close);

  close_button_->setShortcut(QKeySequence::Close);

  // Hide elements
  cancel_button_->hide();
  ui_->progress_group->hide();

  // Connect stuff
  connect(ui_->add, SIGNAL(clicked()), SLOT(Add()));
  connect(ui_->remove, SIGNAL(clicked()), SLOT(Remove()));
  connect(start_button_, SIGNAL(clicked()), SLOT(Start()));
  connect(cancel_button_, SIGNAL(clicked()), SLOT(Cancel()));
  connect(close_button_, SIGNAL(clicked()), SLOT(hide()));
  connect(ui_->details, SIGNAL(clicked()), log_dialog_, SLOT(show()));

  connect(transcoder_, SIGNAL(JobComplete(QString,bool)), SLOT(JobComplete(QString,bool)));
  connect(transcoder_, SIGNAL(LogLine(QString)), SLOT(LogLine(QString)));
  connect(transcoder_, SIGNAL(AllJobsComplete()), SLOT(AllJobsComplete()));
}

TranscodeDialog::~TranscodeDialog() {
  delete log_ui_;
  delete ui_;
}

void TranscodeDialog::SetWorking(bool working) {
  start_button_->setVisible(!working);
  cancel_button_->setVisible(working);
  close_button_->setVisible(!working);
  ui_->input_group->setEnabled(!working);
  ui_->output_group->setEnabled(!working);
  ui_->progress_group->setVisible(true);

  if (working)
    progress_timer_.start(kProgressInterval, this);
  else
    progress_timer_.stop();
}

void TranscodeDialog::Start() {
  SetWorking(true);

  QAbstractItemModel* file_model = ui_->files->model();
  TranscoderPreset preset = ui_->format->itemData(
      ui_->format->currentIndex()).value<TranscoderPreset>();

  // Add jobs to the transcoder
  for (int i=0 ; i<file_model->rowCount() ; ++i) {
    QString filename = file_model->index(i, 0).data(Qt::UserRole).toString();
    transcoder_->AddJob(filename, preset);
  }

  // Set up the progressbar
  ui_->progress_bar->setValue(0);
  ui_->progress_bar->setMaximum(file_model->rowCount() * 100);

  // Reset the UI
  queued_ = file_model->rowCount();
  finished_success_ = 0;
  finished_failed_ = 0;
  UpdateStatusText();

  // Start transcoding
  transcoder_->Start();

  // Save the last output format
  QSettings s;
  s.beginGroup(kSettingsGroup);
  s.setValue("last_output_format", preset.extension_);
}

void TranscodeDialog::Cancel() {
  transcoder_->Cancel();
  SetWorking(false);
}

void TranscodeDialog::JobComplete(const QString& filename, bool success) {
  (*(success ? &finished_success_ : &finished_failed_)) ++;
  queued_ --;

  UpdateStatusText();
  UpdateProgress();
}

void TranscodeDialog::UpdateProgress() {
  int progress = (finished_success_ + finished_failed_) * 100;

  QMap<QString, float> current_jobs = transcoder_->GetProgress();
  foreach (float value, current_jobs.values()) {
    progress += qBound(0, int(value * 100), 99);
  }

  ui_->progress_bar->setValue(progress);
}

void TranscodeDialog::UpdateStatusText() {
  QStringList sections;

  if (queued_) {
    sections << "<font color=\"#3467c8\">" +
        tr("%n remaining", "", queued_) + "</font>";
  }

  if (finished_success_) {
    sections << "<font color=\"#02b600\">" +
        tr("%n finished", "", finished_success_) + "</font>";
  }

  if (finished_failed_) {
    sections << "<font color=\"#b60000\">" +
        tr("%n failed", "", finished_failed_) + "</font>";
  }

  ui_->progress_text->setText(sections.join(", "));
}

void TranscodeDialog::AllJobsComplete() {
  SetWorking(false);
}

void TranscodeDialog::Add() {
  QStringList filenames = QFileDialog::getOpenFileNames(
      this, tr("Add files to transcode"), last_add_dir_,
      QString("%1;;%2").arg(tr(MainWindow::kMusicFilterSpec),
                            tr(MainWindow::kAllFilesFilterSpec)));

  if (filenames.isEmpty())
    return;

  foreach (const QString& filename, filenames) {
    QString name = filename.section('/', -1, -1);
    QString path = filename.section('/', 0, -2);

    QTreeWidgetItem* item = new QTreeWidgetItem(
        ui_->files, QStringList() << name << path);
    item->setData(0, Qt::UserRole, filename);
  }

  last_add_dir_ = filenames[0];
  QSettings s;
  s.beginGroup(kSettingsGroup);
  s.setValue("last_add_dir", last_add_dir_);
}

void TranscodeDialog::Remove() {
  qDeleteAll(ui_->files->selectedItems());
}

void TranscodeDialog::LogLine(const QString &message) {
  QString date(QDateTime::currentDateTime().toString(Qt::TextDate));
  log_ui_->log->appendPlainText(QString("%1: %2").arg(date, message));
}

void TranscodeDialog::timerEvent(QTimerEvent* e) {
  QDialog::timerEvent(e);

  if (e->timerId() == progress_timer_.timerId()) {
    UpdateProgress();
  }
}
