/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * This program 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; version 2 of the License

 *

 * This program 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 this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#include <QGridLayout>

#include <QVBoxLayout>

#include <QLabel>

#include <QListWidget>

#include <QListWidgetItem>

#include <QPushButton>

#include <QTextStream>

#include <QFile>

#include <QLocale>

#include <QSettings>

#include "hwconsts.h"

#include "DataManager.h"

#include "pagetraining.h"

QLayout * PageTraining::bodyLayoutDefinition()

{

    QGridLayout * pageLayout = new QGridLayout();

// left column

    // declare start button, caption and description

    btnPreview = formattedButton(":/res/Trainings.png", true);

    // make both rows equal height

    pageLayout->setRowStretch(0, 1);

    pageLayout->setRowStretch(1, 1);

    // add start button, caption and description to 3 different rows

    pageLayout->addWidget(btnPreview, 0, 0);

    // center preview

    pageLayout->setAlignment(btnPreview, Qt::AlignRight | Qt::AlignVCenter);

// right column

    // info area (caption on top, description below)

    QVBoxLayout * infoLayout = new QVBoxLayout();

    lblCaption = new QLabel();

    lblCaption->setMinimumWidth(360);

    lblCaption->setAlignment(Qt::AlignHCenter | Qt::AlignBottom);

    lblCaption->setWordWrap(true);

    lblDescription = new QLabel();

    lblDescription->setMinimumWidth(360);

    lblDescription->setAlignment(Qt::AlignHCenter | Qt::AlignTop);

    lblDescription->setWordWrap(true);

    infoLayout->addWidget(lblCaption);

    infoLayout->addWidget(lblDescription);

    // tab widget containing all lists

    tbw = new QTabWidget(this);

    pageLayout->addWidget(tbw, 1, 0, 1, 2); // span 2 columns

    // let's not make the tab widget use more space than needed

    tbw->setFixedWidth(400);

    pageLayout->setAlignment(tbw, Qt::AlignHCenter);

    tbw->setStyleSheet("QListWidget { border-style: none; padding-top: 6px; }");

    // training/challenge/scenario lists

    lstTrainings = new QListWidget(this);

    lstTrainings ->setWhatsThis(tr("Pick the training to play"));

    lstChallenges = new QListWidget(this);

    lstChallenges ->setWhatsThis(tr("Pick the challenge to play"));

    lstScenarios= new QListWidget(this);

    lstScenarios->setWhatsThis(tr("Pick the scenario to play"));

    tbw->addTab(lstTrainings, tr("Trainings"));

    tbw->addTab(lstChallenges, tr("Challenges"));

    tbw->addTab(lstScenarios, tr("Scenarios"));

    tbw->setCurrentWidget(lstTrainings);

    return pageLayout;

}

QLayout * PageTraining::footerLayoutDefinition()

{

    QBoxLayout * bottomLayout = new QVBoxLayout();

    const QIcon& lp = QIcon(":/res/Start.png");

    QSize sz = lp.actualSize(QSize(65535, 65535));

    btnStart = new QPushButton();

    btnStart->setStyleSheet("padding: 5px 10px");

    btnStart->setText(QPushButton::tr("Start"));

    btnStart->setWhatsThis(tr("Start fighting"));

    btnStart->setMinimumWidth(sz.width() + 60);

    btnStart->setIcon(lp);

    btnStart->setFixedHeight(50);

    btnStart->setIconSize(sz);

    btnStart->setFlat(true);

    btnStart->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

    bottomLayout->addWidget(btnStart);

    bottomLayout->setAlignment(btnStart, Qt::AlignRight | Qt::AlignVCenter);

    return bottomLayout;

}

void PageTraining::connectSignals()

{

    connect(lstTrainings, SIGNAL(currentItemChanged(QListWidgetItem*, QListWidgetItem*)), this, SLOT(updateInfo()));

    connect(lstTrainings, SIGNAL(itemClicked(QListWidgetItem*)), this, SLOT(updateInfo()));

    connect(lstTrainings, SIGNAL(itemDoubleClicked(QListWidgetItem*)), this, SLOT(startSelected()));

    connect(lstChallenges, SIGNAL(currentItemChanged(QListWidgetItem*, QListWidgetItem*)), this, SLOT(updateInfo()));

    connect(lstChallenges, SIGNAL(itemClicked(QListWidgetItem*)), this, SLOT(updateInfo()));

    connect(lstChallenges, SIGNAL(itemDoubleClicked(QListWidgetItem*)), this, SLOT(startSelected()));

    connect(lstScenarios, SIGNAL(currentItemChanged(QListWidgetItem*, QListWidgetItem*)), this, SLOT(updateInfo()));

    connect(lstScenarios, SIGNAL(itemClicked(QListWidgetItem*)), this, SLOT(updateInfo()));

    connect(lstScenarios, SIGNAL(itemDoubleClicked(QListWidgetItem*)), this, SLOT(startSelected()));

    connect(tbw, SIGNAL(currentChanged(int)), this, SLOT(updateInfo()));

    connect(btnPreview, SIGNAL(clicked()), this, SLOT(startSelected()));

    connect(btnStart, SIGNAL(clicked()), this, SLOT(startSelected()));

}

PageTraining::PageTraining(QWidget* parent) : AbstractPage(parent)

{

    initPage();

    DataManager & dataMgr = DataManager::instance();

    // get locale

    QSettings settings(dataMgr.settingsFileName(),

                       QSettings::IniFormat);

    QString loc = QLocale().name();

    QString infoFile = QString("physfs://Locale/missions_" + loc + ".txt");

    // if file is non-existant try with language only

    if (!QFile::exists(infoFile))

        infoFile = QString("physfs://Locale/missions_" + loc.remove(QRegExp("_.*$")) + ".txt");

    // fallback if file for current locale is non-existant

    if (!QFile::exists(infoFile))

        infoFile = QString("physfs://Locale/missions_en.txt");

    // preload mission info for current locale

    m_info = new QSettings(infoFile, QSettings::IniFormat, this);

    m_info->setIniCodec("UTF-8");

    QStringList m_list;

    QListWidget * m_widget;

    QString subFolder;

    for(int i=1; i<=3; i++) {

        switch(i) {

            case 1:

                subFolder = "Training";

                m_widget = lstTrainings;

                break;

            case 2:

                subFolder = "Challenge";

                m_widget = lstChallenges;

                break;

            case 3:

                subFolder = "Scenario";

                m_widget = lstScenarios;

                break;

        }

        // scripts to load

        // first, load scripts in order specified in order.cfg (if present)

        QFile orderFile(QString("physfs://Missions/%1/order.cfg").arg(subFolder));

        QStringList orderedMissions;

        if (orderFile.open(QFile::ReadOnly))

        {

            QString m_id;

            QTextStream input(&orderFile);

            while(true)

            {

                m_id = input.readLine();

                if(m_id.isNull() || m_id.isEmpty())

                {

                    break;

                }

                QListWidgetItem * item = new QListWidgetItem(m_id);

                QString name = item->text().replace("_", " ");

                name = m_info->value(m_id + ".name", name).toString();

                item->setText(name);

                item->setData(Qt::UserRole, m_id);

                m_widget->addItem(item);

                orderedMissions << m_id;

            }

        }

        // then, just load anything else in no particular order

        m_list = dataMgr.entryList(

                    "Missions/" + subFolder,

                    QDir::Files, QStringList("*.lua")).

               replaceInStrings(QRegExp("\\.lua$"), "");

        foreach (const QString & m_id, m_list)

        {

            // Disallow duplicates from order.cfg

            if (orderedMissions.contains(m_id))

            {

                continue;

            }

            QListWidgetItem * item = new QListWidgetItem(m_id);

            // fallback name: replace underscores in mission name with spaces

            QString name = item->text().replace("_", " ");

            // see if we can get a prettier/translated name

            name = m_info->value(m_id + ".name", name).toString();

            item->setText(name);

            // store original name in data

            item->setData(Qt::UserRole, m_id);

            m_widget->addItem(item);

        }

    }

    updateInfo();

    // pre-select first mission

    if (lstTrainings->count() > 0)

        lstTrainings->setCurrentRow(0);

    if (lstChallenges->count() > 0)

        lstChallenges->setCurrentRow(0);

    if (lstScenarios->count() > 0)

        lstScenarios->setCurrentRow(0);

}

QString PageTraining::getSubFolderOfSelected()

{

    QString subFolder;

    if (tbw->currentWidget() == lstTrainings) {

        subFolder = "Training";

    } else if (tbw->currentWidget() == lstChallenges) {

        subFolder = "Challenge";

    } else if (tbw->currentWidget() == lstScenarios) {

        subFolder = "Scenario";

    } else {

        subFolder = "Training";

    }

    return subFolder;

}

void PageTraining::startSelected()

{

    QListWidget *list;

    list = (QListWidget*) tbw->currentWidget();

    QListWidgetItem * curItem = list->currentItem();

    if (curItem != NULL)

        emit startMission(curItem->data(Qt::UserRole).toString(), getSubFolderOfSelected());

}

void PageTraining::updateInfo()

{

    if (tbw->currentWidget())

    {

        QString subFolder;

        QListWidget *list;

        subFolder = getSubFolderOfSelected();

        list = (QListWidget*) tbw->currentWidget();

        if (list->currentItem())

        {

            // TODO also use .pngs in userdata folder

            QString thumbFile =     "physfs://Graphics/Missions/" +

                                    subFolder + "/" +

                                    list->currentItem()->data(Qt::UserRole).toString() +

                                    "@2x.png";

            if (QFile::exists(thumbFile))

                btnPreview->setIcon(QIcon(thumbFile));

            else

                btnPreview->setIcon(QIcon(":/res/Trainings.png"));

            btnPreview->setWhatsThis(tr("Start fighting"));

            QString realName = list->currentItem()->data(

                                    Qt::UserRole).toString();

            QString caption = m_info->value(realName + ".name",

                                            list->currentItem()->text()).toString();

            QString description = m_info->value(realName + ".desc",

                                                tr("No description available")).toString();

            lblCaption->setText("<h2>" + caption +"</h2>");

            lblDescription->setText(description);

        }

        else

        {

            btnPreview->setIcon(QIcon(":/res/Trainings.png"));

            lblCaption->setText(tr("Select a mission!"));

            // TODO better text and tr()

            lblDescription->setText("");

        }

    }

}