/*

 * 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 "keybinder.h"

#include "HWApplication.h"

#include "DataManager.h"

#include <QHBoxLayout>

#include <QScrollArea>

#include <QTableWidget>

#include <QTableWidgetItem>

#include <QStandardItemModel>

#include <QAbstractItemModel>

#include <QListWidget>

#include <QListWidgetItem>

#include <QPushButton>

#include <QHeaderView>

#include <QComboBox>

#include <QLabel>

#include <QFrame>

#include <QDebug>

KeyBinder::KeyBinder(QWidget * parent, const QString & helpText, const QString & defaultText, const QString & resetButtonText) : QWidget(parent)

{

    this->defaultText = defaultText;

    enableSignal = false;

    p_hasConflicts = false;

    // Two-column tab layout

    QHBoxLayout * pageKeysLayout = new QHBoxLayout(this);

    pageKeysLayout->setSpacing(0);

    pageKeysLayout->setContentsMargins(0, 0, 0, 0);

    // Table for category list

    QVBoxLayout * catListContainer = new QVBoxLayout();

    catListContainer->setContentsMargins(10, 10, 10, 10);

    catList = new QListWidget();

    catList->setMinimumWidth(180);

    catList->setStyleSheet("QListWidget::item { font-size: 14px; } QListWidget:hover { border-color: #F6CB1C; } QListWidget::item:selected { background: #150A61; color: yellow; }");

    catList->setFocusPolicy(Qt::NoFocus);

    connect(catList, SIGNAL(currentRowChanged(int)), this, SLOT(changeBindingsPage(int)));

    catListContainer->addWidget(catList);

    pageKeysLayout->addLayout(catListContainer);

    // Reset all binds button

    if (!resetButtonText.isEmpty())

    {

        QPushButton * btnResetAll = new QPushButton(resetButtonText);

        catListContainer->addWidget(btnResetAll);

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

        btnResetAll->setFixedHeight(40);

        catListContainer->setStretch(1, 0);

        catListContainer->setSpacing(10);

        connect(btnResetAll, SIGNAL(clicked()), this, SIGNAL(resetAllBinds()));

    }

    // Container for pages of key bindings

    QWidget * bindingsPagesContainer = new QWidget();

    QVBoxLayout * rightLayout = new QVBoxLayout(bindingsPagesContainer);

    // Scroll area for key bindings

    QScrollArea * scrollArea = new QScrollArea();

    scrollArea->setContentsMargins(0, 0, 0, 0);

    scrollArea->setWidget(bindingsPagesContainer);

    scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);

    scrollArea->setWidgetResizable(true);

    scrollArea->setFrameShape(QFrame::NoFrame);

    scrollArea->setObjectName("keyBinderScrollArea");

    // Add key binding pages to bindings tab

    pageKeysLayout->addWidget(scrollArea);

    pageKeysLayout->setStretch(1, 1);

    // Custom help text

    QLabel * helpLabel = new QLabel();

    helpLabel->setText(helpText);

    helpLabel->setStyleSheet("color: #130F2A; background: #F6CB1C; border: solid 4px #F6CB1C; border-radius: 10px; padding: auto 20px;");

    helpLabel->setFixedHeight(24);

    rightLayout->addWidget(helpLabel, 0, Qt::AlignCenter);

    conflictLabel = new QLabel();

    conflictLabel->setText(tr("Warning: The same key is assigned multiple times!"));

    conflictLabel->setStyleSheet("color: white; background: #E31A1A; border: solid 4px #E31A1A; border-radius: 10px; padding: auto 20px;");

    conflictLabel->setFixedHeight(24);

    conflictLabel->setHidden(true);

    rightLayout->addWidget(conflictLabel, 0, Qt::AlignCenter);

    // Category list and bind table row heights

    const int rowHeight = 20;

    QSize catSize, headerSize;

    catSize.setHeight(36);

    headerSize.setHeight(24);

    // Category list header

    QListWidgetItem * catListHeader = new QListWidgetItem(tr("Category"));

    catListHeader->setSizeHint(headerSize);

    catListHeader->setFlags(Qt::NoItemFlags);

    catListHeader->setForeground(QBrush(QColor("#130F2A")));

    catListHeader->setBackground(QBrush(QColor("#F6CB1C")));

    catListHeader->setTextAlignment(Qt::AlignCenter);

    catList->addItem(catListHeader);

    // Populate

    bindingsPages = new QHBoxLayout();

    bindingsPages->setContentsMargins(0, 0, 0, 0);

    rightLayout->addLayout(bindingsPages);

    QWidget * curPage = NULL;

    QVBoxLayout * curLayout = NULL;

    QTableWidget * curTable = NULL;

    bool bFirstPage = true;

    selectedBindTable = NULL;

    bindComboBoxCellMappings = new QHash<QObject *, QTableWidgetItem *>();

    bindCellComboBoxMappings = new QHash<QTableWidgetItem *, QComboBox *>();

    dropDownIcon = new QIcon();

    QPixmap dd1 = QPixmap(":/res/dropdown.png");

    QPixmap dd2 = QPixmap(":/res/dropdown_selected.png");

    dropDownIcon->addPixmap(dd1, QIcon::Normal);

    dropDownIcon->addPixmap(dd2, QIcon::Selected);

    conflictIcon = new QIcon();

    QPixmap kc1 = QPixmap(":/res/keyconflict.png");

    QPixmap kc2 = QPixmap(":/res/keyconflict_selected.png");

    conflictIcon->addPixmap(kc1, QIcon::Normal);

    conflictIcon->addPixmap(kc2, QIcon::Selected);

    QPixmap emptySpace = QPixmap(16, 16);

    emptySpace.fill(QColor(0, 0, 0, 0));

    QIcon emptyIcon = QIcon(emptySpace);

    for (int i = 0; i < BINDS_NUMBER; i++)

    {

        if (cbinds[i].category != NULL)

        {

            // Add stretch at end of previous layout

            if (curLayout != NULL) curLayout->insertStretch(-1, 1);

            // Category list item

            QListWidgetItem * catItem = new QListWidgetItem(HWApplication::translate("binds (categories)", cbinds[i].category));

            catItem->setSizeHint(catSize);

            catList->addItem(catItem);

            // Create new page

            curPage = new QWidget();

            curLayout = new QVBoxLayout(curPage);

            curLayout->setSpacing(2);

            bindingsPages->addWidget(curPage);

            if (!bFirstPage) curPage->setVisible(false);

        }

        // Description

        if (cbinds[i].description != NULL)

        {

            QLabel * desc = new QLabel(HWApplication::translate("binds (descriptions)", cbinds[i].description));

            curLayout->addWidget(desc, 0);

            QFrame * divider = new QFrame();

            divider->setFrameShape(QFrame::HLine);

            divider->setFrameShadow(QFrame::Plain);

            curLayout->addWidget(divider, 0);

        }

        // New table

        if (cbinds[i].category != NULL || cbinds[i].description != NULL)

        {

            curTable = new QTableWidget(0, 2);

            curTable->verticalHeader()->setVisible(false);

            curTable->horizontalHeader()->setVisible(false);

            curTable->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);

            curTable->verticalHeader()->setDefaultSectionSize(rowHeight);

            curTable->setShowGrid(false);

            curTable->setStyleSheet("QTableWidget { border: none; background-color: transparent; } ");

            curTable->setSelectionBehavior(QAbstractItemView::SelectRows);

            curTable->setSelectionMode(QAbstractItemView::SingleSelection);

            curTable->setFocusPolicy(Qt::NoFocus);

            connect(curTable, SIGNAL(itemSelectionChanged()), this, SLOT(bindSelectionChanged()));

            connect(curTable, SIGNAL(itemClicked(QTableWidgetItem *)), this, SLOT(bindCellClicked(QTableWidgetItem *)));

            curLayout->addWidget(curTable, 0);

        }

        // Hidden combo box

        QComboBox * comboBox;

        if (cbinds[i].action != "!MULTI")

        {

            comboBox = CBBind[i] = new QComboBox(curTable);

            comboBox->setModel((QAbstractItemModel*)DataManager::instance().bindsModel());

            comboBox->setVisible(false);

            comboBox->setMinimumWidth(400);

            comboBox->setMaxVisibleItems(50);

        }

        else

        {

            comboBox = CBBind[i] = NULL;

        }

        // Table row

        int row = curTable->rowCount();

        QTableWidgetItem * nameCell = new QTableWidgetItem(HWApplication::translate("binds", cbinds[i].name));

        curTable->insertRow(row);

        curTable->setItem(row, 0, nameCell);

        QTableWidgetItem * bindCell;

        if (cbinds[i].action != "!MULTI")

        {

            bindCell = new QTableWidgetItem(comboBox->currentText());

            nameCell->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);

            bindCell->setIcon(*dropDownIcon);

            bindCell->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);

        }

        else

        {

            bindCell = new QTableWidgetItem(HWApplication::translate("binds (combination)", cbinds[i].strbind.toUtf8().constData()));

            nameCell->setFlags(Qt::NoItemFlags);

            bindCell->setFlags(Qt::NoItemFlags);

            bindCell->setIcon(emptyIcon);

        }

        curTable->setItem(row, 1, bindCell);

        curTable->resizeColumnsToContents();

        curTable->setFixedHeight(curTable->verticalHeader()->length() + 10);

        if (cbinds[i].action != "!MULTI")

        {

            // Updates the text in the table cell

            connect(comboBox, SIGNAL(currentIndexChanged(const QString &)), this, SLOT(bindChanged(const QString &)));

            // Map combo box and that row's cells to each other

            bindComboBoxCellMappings->insert(comboBox, bindCell);

            bindCellComboBoxMappings->insert(nameCell, comboBox);

            bindCellComboBoxMappings->insert(bindCell, comboBox);

        }

    }

    // Add stretch at end of last layout

    if (curLayout != NULL) curLayout->insertStretch(-1, 1);

    // Go to first page

    catList->setCurrentItem(catList->item(1));

    enableSignal = true;

}

KeyBinder::~KeyBinder()

{

    delete bindComboBoxCellMappings;

    delete bindCellComboBoxMappings;

}

// Switches between different pages of key binds

void KeyBinder::changeBindingsPage(int page)

{

    page--; // Disregard first item (the list header)

    int pages = bindingsPages->count();

    for (int i = 0; i < pages; i++)

        bindingsPages->itemAt(i)->widget()->setVisible(false);

    bindingsPages->itemAt(page)->widget()->setVisible(true);

}

// When a key bind combobox value is changed, updates the table cell text

void KeyBinder::bindChanged(const QString & text)

{

    bindComboBoxCellMappings->value(sender())->setText(text);

    if (enableSignal)

    {

        for (int i = 0; i < BINDS_NUMBER; i++)

        {

            if (CBBind[i] == sender())

            {

                emit bindUpdate(i);

                checkConflicts();

                break;

            }

        }

    }

}

// When a row in a key bind table is clicked, this shows the popup

void KeyBinder::bindCellClicked(QTableWidgetItem * item)

{

    QComboBox * box = bindCellComboBoxMappings->value(item);

    if(box == NULL)

        return;

    QTableWidget * table = item->tableWidget();

    box->move(

        table->horizontalHeader()->sectionSize(0),

        (table->verticalHeader()->defaultSectionSize() * (item->row() + 1)) - (box->height()) + 1

    );

    box->showPopup();

}

// When a new row in a bind table is *selected*, this clears selection in any other table

void KeyBinder::bindSelectionChanged()

{

    QTableWidget * theSender = (QTableWidget*)sender();

    if (theSender != selectedBindTable)

    {

        if (selectedBindTable != NULL)

            selectedBindTable->clearSelection();

        selectedBindTable = theSender;

    }

}

// check if the given key is bound multiple times

bool KeyBinder::checkConflictsWith(int compareTo, bool updateState)

{

    for(int i=0; i<BINDS_NUMBER; i++)

    {

        if(i == compareTo)

            continue;

        if(CBBind[i] == NULL || CBBind[compareTo] == NULL)

            continue;

        QString bind1 = CBBind[i]->currentData(Qt::UserRole + 1).toString();

        QString bind2 = CBBind[compareTo]->currentData(Qt::UserRole + 1).toString();

        // TODO: For team key binds, also check collisions with global key binds

        if((!(bind1 == "none" || bind2 == "none" || bind1 == "default" || bind2 == "default")) && (bind1 == bind2))

        {

            if(updateState)

            {

                p_hasConflicts = true;

                conflictLabel->setHidden(false);

            }

            QTableWidgetItem* conflictItem = bindComboBoxCellMappings->value(CBBind[i]);

            conflictItem->setIcon(*conflictIcon);

            conflictItem->setBackground(QBrush(QColor(0xE3, 0x1A, 0x1A)));

            conflictItem->setForeground(QBrush(Qt::white));

            conflictItems.append(conflictItem);

            conflictItem = bindComboBoxCellMappings->value(CBBind[compareTo]);

            conflictItem->setIcon(*conflictIcon);

            conflictItem->setBackground(QBrush(QColor(0xE3, 0x1A, 0x1A)));

            conflictItem->setForeground(QBrush(Qt::white));

            conflictItems.append(conflictItem);

            return true;

        }

    }

    if(updateState)

    {

        p_hasConflicts = false;

        conflictLabel->setHidden(true);

    }

    for (int c=0; c < conflictItems.size(); c++)

    {

        QTableWidgetItem* conflictItem = conflictItems[c];

        conflictItem->setIcon(*dropDownIcon);

        conflictItem->setBackground(QBrush(Qt::transparent));

        conflictItem->setForeground(QBrush(QColor("#F6CB1C")));

        conflictItem = NULL;

    }

    conflictItems.clear();

    return false;

}

// check if any key is bound multiple times and causing a conflict

bool KeyBinder::checkConflicts()

{

    bool conflict = false;

    for(int i=0; i<BINDS_NUMBER; i++)

    {

        conflict = checkConflictsWith(i, false);

        if(conflict)

        {

            p_hasConflicts = true;

            conflictLabel->setHidden(false);

            return true;

        }

    }

    p_hasConflicts = false;

    conflictLabel->setHidden(true);

    return false;

}

bool KeyBinder::hasConflicts()

{

    return p_hasConflicts;

}

// Set a combobox's index

void KeyBinder::setBindIndex(int keyIndex, int bindIndex)

{

    enableSignal = false;

    if(CBBind[keyIndex] != NULL)

        CBBind[keyIndex]->setCurrentIndex(bindIndex);

    enableSignal = true;

}

// Return a combobox's selected index

int KeyBinder::bindIndex(int keyIndex)

{

    if(CBBind[keyIndex] != NULL)

        return CBBind[keyIndex]->currentIndex();

    else

        return 0;

}

// Clears selection and goes to first category

void KeyBinder::resetInterface()

{

    enableSignal = false;

    catList->setCurrentItem(catList->item(1));

    changeBindingsPage(1);

    if (selectedBindTable != NULL)

    {

        selectedBindTable->clearSelection();

        selectedBindTable = NULL;

    }

    // Default bind text

    DataManager::instance().bindsModel()->item(0)->setData(defaultText, Qt::DisplayRole);

    for (int i = 0; i < BINDS_NUMBER; i++)

    {

        if (CBBind[i] != NULL)

        {

            CBBind[i]->setModel(DataManager::instance().bindsModel());

            CBBind[i]->setCurrentIndex(0);

            bindComboBoxCellMappings->value(CBBind[i])->setText(defaultText);

        }

    }

    enableSignal = true;

}