/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2007 Igor Ulyanov <iulyanov@gmail.com>

 * Copyright (c) 2007-2011 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 */

#include <QDesktopServices>

#include <QTextBrowser>

#include <QLineEdit>

#include <QAction>

#include <QTextDocument>

#include <QFile>

#include <QSettings>

#include <QTextStream>

#include <QMenu>

#include <QCursor>

#include <QScrollBar>

#include <QItemSelectionModel>

#include <QStringList>

#include <QRegExp>

#include "HWDataManager.h"

#include "hwconsts.h"

#include "gameuiconfig.h"

#include "chatwidget.h"

ListWidgetNickItem::ListWidgetNickItem(const QString& nick, bool isFriend, bool isIgnored) : QListWidgetItem(nick)

{

    this->aFriend = isFriend;

    this->isIgnored = isIgnored;

}

void ListWidgetNickItem::setFriend(bool isFriend)

{

    this->aFriend = isFriend;

}

void ListWidgetNickItem::setIgnored(bool isIgnored)

{

    this->isIgnored = isIgnored;

}

bool ListWidgetNickItem::isFriend()

{

    return aFriend;

}

bool ListWidgetNickItem::ignored()

{

    return isIgnored;

}

bool ListWidgetNickItem::operator< (const QListWidgetItem & other) const

{

    // case in-sensitive comparison of the associated strings

    // chars that are no letters are sorted at the end of the list

    ListWidgetNickItem otherNick = const_cast<ListWidgetNickItem &>(dynamic_cast<const ListWidgetNickItem &>(other));

    // ignored always down

    if (isIgnored != otherNick.ignored())

        return !isIgnored;

    // friends always up

    if (aFriend != otherNick.isFriend())

        return aFriend;

    QString txt1 = text().toLower();

    QString txt2 = other.text().toLower();

    bool firstIsShorter = (txt1.size() < txt2.size());

    int len = firstIsShorter?txt1.size():txt2.size();

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

    {

        if (txt1[i] == txt2[i])

            continue;

        if (txt1[i].isLetter() != txt2[i].isLetter())

            return txt1[i].isLetter();

        return (txt1[i] < txt2[i]);

    }

    return firstIsShorter;

}

QString * HWChatWidget::s_styleSheet = NULL;

QStringList * HWChatWidget::s_displayNone = NULL;

QString & HWChatWidget::styleSheet()

{

    if (s_styleSheet != NULL)

        return *s_styleSheet;

    // initialize

    s_styleSheet = new QString();

    // getting a reference

    QString & style = *s_styleSheet;

    // load external stylesheet if there is any

    QFile extFile(HWDataManager::instance().findFileForRead("css/chat.css"));

    QFile resFile(":/res/css/chat.css");

    QFile & file = (extFile.exists()?extFile:resFile);

    if (file.open(QIODevice::ReadOnly | QIODevice::Text))

    {

        QTextStream in(&file);

        while (!in.atEnd())

        {

            QString line = in.readLine();

            if(!line.isEmpty())

                style.append(line);

        }

    }

    // prepare for MAGIC :D

    // matches (multi-)whitespaces (for replacement with simple space)

    QRegExp ws("\\s+");

    // matches comments (for removal)

    QRegExp rem("/\\*([^*]|\\*(?!/))*\\*/");

    // strip comments and multi-whitespaces to compress the style-sheet a bit

    style = style.remove(rem).replace(ws," ");

    // now let's see what messages the user does not want to be displayed

    // by checking for display:none; (since QTextBrowser does not support it)

    // MOAR MAGIC :DDD

    // matches definitions lacking display:none; (for removal)

    QRegExp displayed(

        "([^{}]*\\{)(?!([^}]*;)* ?display ?: ?none ?(;[^}]*)?\\})[^}]*\\}");

    // matches all {...} and , (used as seperator for splitting into names)

    QRegExp split(" *(\\{[^}]*\\}|,) *");

    // matches class names that are referenced without hierachy

    QRegExp nohierarchy("^.[^ .]+$");

    QStringList victims = QString(style).

                                remove(displayed). // remove visible stuff

                                split(split). // get a list of the names

                                filter(nohierarchy). // only direct class names

                                replaceInStrings(QRegExp("^."),""); // crop .

    victims.removeDuplicates();

    s_displayNone = new QStringList(victims);

    return style;

}

void HWChatWidget::displayError(const QString & message)

{

    // scroll to the end

    chatText->moveCursor(QTextCursor::End);

}

void HWChatWidget::displayNotice(const QString & message)

{

}

void HWChatWidget::displayWarning(const QString & message)

{

}

HWChatWidget::HWChatWidget(QWidget* parent, QSettings * gameSettings, bool notify) :

  QWidget(parent),

  mainLayout(this)

{

    this->gameSettings = gameSettings;

    this->notify = notify;

    if(notify && gameSettings->value("frontend/sound", true).toBool())

        helloSound = HWDataManager::instance().findFileForRead(

                        "Sounds/voices/Classic/Hello.ogg");

    mainLayout.setSpacing(1);

    mainLayout.setMargin(1);

    mainLayout.setSizeConstraint(QLayout::SetMinimumSize);

    mainLayout.setColumnStretch(0, 76);

    mainLayout.setColumnStretch(1, 24);

    chatEditLine = new SmartLineEdit(this);

    chatEditLine->addCommands(QStringList("/me"));

    chatEditLine->setMaxLength(300);

    connect(chatEditLine, SIGNAL(returnPressed()), this, SLOT(returnPressed()));

    mainLayout.addWidget(chatEditLine, 2, 0);

    chatText = new QTextBrowser(this);

    chatText->document()->setDefaultStyleSheet(styleSheet());

    chatText->setMinimumHeight(20);

    chatText->setMinimumWidth(10);

    chatText->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

    chatText->setOpenLinks(false);

    connect(chatText, SIGNAL(anchorClicked(const QUrl&)),

        this, SLOT(linkClicked(const QUrl&)));

    mainLayout.addWidget(chatText, 0, 0, 2, 1);

    chatNicks = new QListWidget(this);

    chatNicks->setMinimumHeight(10);

    chatNicks->setMinimumWidth(10);

    chatNicks->setSortingEnabled(true);

    chatNicks->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

    chatNicks->setContextMenuPolicy(Qt::ActionsContextMenu);

    connect(chatNicks, SIGNAL(itemDoubleClicked(QListWidgetItem *)),

        this, SLOT(chatNickDoubleClicked(QListWidgetItem *)));

    connect(chatNicks, SIGNAL(currentRowChanged(int)),

        this, SLOT(chatNickSelected(int)));

    mainLayout.addWidget(chatNicks, 0, 1, 3, 1);

    acInfo = new QAction(QAction::tr("Info"), chatNicks);

    acInfo->setIcon(QIcon(":/res/info.png"));

    connect(acInfo, SIGNAL(triggered(bool)), this, SLOT(onInfo()));

    acKick = new QAction(QAction::tr("Kick"), chatNicks);

    acKick->setIcon(QIcon(":/res/kick.png"));

    connect(acKick, SIGNAL(triggered(bool)), this, SLOT(onKick()));

    acBan = new QAction(QAction::tr("Ban"), chatNicks);

    acBan->setIcon(QIcon(":/res/ban.png"));

    connect(acBan, SIGNAL(triggered(bool)), this, SLOT(onBan()));

    acFollow = new QAction(QAction::tr("Follow"), chatNicks);

    acFollow->setIcon(QIcon(":/res/follow.png"));

    connect(acFollow, SIGNAL(triggered(bool)), this, SLOT(onFollow()));

    acIgnore = new QAction(QAction::tr("Ignore"), chatNicks);

    acIgnore->setIcon(QIcon(":/res/ignore.png"));

    connect(acIgnore, SIGNAL(triggered(bool)), this, SLOT(onIgnore()));

    acFriend = new QAction(QAction::tr("Add friend"), chatNicks);

    acFriend->setIcon(QIcon(":/res/addfriend.png"));

    connect(acFriend, SIGNAL(triggered(bool)), this, SLOT(onFriend()));

    chatNicks->insertAction(0, acFriend);

    chatNicks->insertAction(0, acInfo);

    chatNicks->insertAction(0, acIgnore);

    showReady = false;

    setShowFollow(true);

}

void HWChatWidget::linkClicked(const QUrl & link)

{

    if (link.scheme() == "http")

        QDesktopServices::openUrl(link);

    if (link.scheme() == "hwnick")

    {

        // decode nick

        const QString& nick = QString::fromUtf8(QByteArray::fromBase64(link.encodedQuery()));

        QList<QListWidgetItem *> items = chatNicks->findItems(nick, Qt::MatchExactly);

        if (items.size() < 1)

            return;

        QMenu * popup = new QMenu(this);

        // selecting an item will automatically scroll there, so let's save old position

        QScrollBar * scrollBar = chatNicks->verticalScrollBar();

        int oldScrollPos = scrollBar->sliderPosition();

        // select the nick which we want to see the actions for

        chatNicks->setCurrentItem(items[0], QItemSelectionModel::Clear);

        // selecting an item will automatically scroll there, so let's save old position

        scrollBar->setSliderPosition(oldScrollPos);

        // load actions

        popup->addActions(chatNicks->actions());

        // display menu popup at mouse cursor position

        popup->popup(QCursor::pos());

    }

}

void HWChatWidget::setShowFollow(bool enabled)

{

    if (enabled) {

        if (!(chatNicks->actions().contains(acFollow)))

            chatNicks->insertAction(acFriend, acFollow);

    }

    else {

        if (chatNicks->actions().contains(acFollow))

            chatNicks->removeAction(acFollow);

    }

}

void HWChatWidget::loadList(QStringList & list, const QString & file)

{

    list.clear();

    QFile txt(cfgdir->absolutePath() + "/" + file);

    if(!txt.open(QIODevice::ReadOnly))

        return;

    QTextStream stream(&txt);

    stream.setCodec("UTF-8");

    while(!stream.atEnd())

    {

        QString str = stream.readLine();

        if(str.startsWith(";") || str.length() == 0)

            continue;

        list << str.trimmed();

    }

    //readd once we require newer Qt than 4.4

    //list.removeDuplicates();

    txt.close();

}

void HWChatWidget::saveList(QStringList & list, const QString & file)

{

    QFile txt(cfgdir->absolutePath() + "/" + file);

    // list empty? => rather have no file for the list than an empty one

    if (list.isEmpty())

    {

        if (txt.exists())

        {

            // try to remove file, if successful we're done here.

            if (txt.remove())

                return;

        }

        else

            // there is no file

            return;

    }

    if(!txt.open(QIODevice::WriteOnly | QIODevice::Truncate))

        return;

    QTextStream stream(&txt);

    stream.setCodec("UTF-8");

    stream << "; this list is used by Hedgewars - do not edit it unless you know what you're doing!" << endl;

    for(int i = 0; i < list.size(); i++)

        stream << list[i] << endl;

    txt.close();

}

void HWChatWidget::updateNickItem(QListWidgetItem *nickItem)

{

    QString nick = nickItem->text();

    ListWidgetNickItem * item = dynamic_cast<ListWidgetNickItem*>(nickItem);

    item->setFriend(friendsList.contains(nick, Qt::CaseInsensitive));

    item->setIgnored(ignoreList.contains(nick, Qt::CaseInsensitive));

    if(item->ignored())

    {

        item->setIcon(QIcon(showReady ? (item->data(Qt::UserRole).toBool() ? ":/res/chat_ignore_on.png" : ":/res/chat_ignore_off.png") : ":/res/chat_ignore.png"));

        item->setForeground(Qt::gray);

    }

    else if(item->isFriend())

    {

        item->setIcon(QIcon(showReady ? (item->data(Qt::UserRole).toBool() ? ":/res/chat_friend_on.png" : ":/res/chat_friend_off.png") : ":/res/chat_friend.png"));

        item->setForeground(Qt::green);

    }

    else

    {

        item->setIcon(QIcon(showReady ? (item->data(Qt::UserRole).toBool() ? ":/res/chat_default_on.png" : ":/res/chat_default_off.png") : ":/res/chat_default.png"));

        item->setForeground(QBrush(QColor(0xff, 0xcc, 0x00)));

    }

}

void HWChatWidget::updateNickItems()

{

    for(int i = 0; i < chatNicks->count(); i++)

        updateNickItem(chatNicks->item(i));

    chatNicks->sortItems();

}

void HWChatWidget::loadLists(const QString & nick)

{

    loadList(ignoreList, nick.toLower() + "_ignore.txt");

    loadList(friendsList, nick.toLower() + "_friends.txt");

    updateNickItems();

}

void HWChatWidget::saveLists(const QString & nick)

{

    saveList(ignoreList, nick.toLower() + "_ignore.txt");

    saveList(friendsList, nick.toLower() + "_friends.txt");

}

void HWChatWidget::returnPressed()

{

    QStringList lines = chatEditLine->text().split('\n');

    chatEditLine->rememberCurrentText();

    chatEditLine->clear();

    foreach (const QString &line, lines)

        emit chatLine(line);

}

void HWChatWidget::onChatString(const QString& str)

{

    onChatString("", str);

}

const QRegExp HWChatWidget::URLREGEXP = QRegExp("(http://)?(www\\.)?(hedgewars\\.org(/[^ ]*)?)");

void HWChatWidget::onChatString(const QString& nick, const QString& str)

{

    bool isFriend = false;

    if (!nick.isEmpty()) {

        // don't show chat lines that are from ignored nicks

        if (ignoreList.contains(nick, Qt::CaseInsensitive))

            return;

        // friends will get special treatment, of course

        isFriend = friendsList.contains(nick, Qt::CaseInsensitive);

    }

    QString formattedStr = Qt::escape(str.mid(1));

    // make hedgewars.org urls actual links

    formattedStr = formattedStr.replace(URLREGEXP, "<a href=\"http://\\3\">\\3</a>");

    // "link" nick, but before that encode it in base64 to make sure it can't intefere with html/url syntax

    // the nick is put as querystring as putting it as host would convert it to it's lower case variant

    if(!nick.isEmpty())

        formattedStr.replace("|nick|",QString("<a href=\"hwnick://?%1\" class=\"nick\">%2</a>").arg(QString(nick.toUtf8().toBase64())).arg(nick));

    QString cssClass("msg_UserChat");

    // check first character for color code and set color properly

    switch (str[0].toAscii()) {

        case 3:

            cssClass = (isFriend ? "msg_FriendJoin" : "msg_UserJoin");

            break;

        case 2:

            cssClass = (isFriend ? "msg_FriendAction" : "msg_UserAction");

            break;

        default:

            if (isFriend)

                cssClass = "msg_FriendChat";

    }

    addLine(cssClass,formattedStr);

}

void HWChatWidget::addLine(const QString & cssClass, QString line)

{

    if (s_displayNone->contains(cssClass))

        return; // the css forbids us to display this line

    if (chatStrings.size() > 250)

        chatStrings.removeFirst();

    line = QString("<span class=\"%2\">%1</span>").arg(line).arg(cssClass);

    chatStrings.append(line);

    chatText->setHtml(chatStrings.join("<br>"));

    chatText->moveCursor(QTextCursor::End);

}

void HWChatWidget::onServerMessage(const QString& str)

{

    if (chatStrings.size() > 250)

        chatStrings.removeFirst();

    chatStrings.append("<hr>" + str + "<hr>");

    chatText->setHtml(chatStrings.join("<br>"));

    chatText->moveCursor(QTextCursor::End);