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#include <QtGui>

#include "chatdialog.h"

ChatDialog::ChatDialog(QWidget *parent)

    : QDialog(parent)

{

    setupUi(this);

    lineEdit->setFocusPolicy(Qt::StrongFocus);

    textEdit->setFocusPolicy(Qt::NoFocus);

    textEdit->setReadOnly(true);

    listWidget->setFocusPolicy(Qt::NoFocus);

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

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

    connect(&client, SIGNAL(newMessage(QString,QString)),

            this, SLOT(appendMessage(QString,QString)));

    connect(&client, SIGNAL(newParticipant(QString)),

            this, SLOT(newParticipant(QString)));

    connect(&client, SIGNAL(participantLeft(QString)),

            this, SLOT(participantLeft(QString)));

    myNickName = client.nickName();

    newParticipant(myNickName);

    tableFormat.setBorder(0);

    QTimer::singleShot(10 * 1000, this, SLOT(showInformation()));

}

void ChatDialog::appendMessage(const QString &from, const QString &message)

{

    if (from.isEmpty() || message.isEmpty())

        return;

    QTextCursor cursor(textEdit->textCursor());

    cursor.movePosition(QTextCursor::End);

    QTextTable *table = cursor.insertTable(1, 2, tableFormat);

    table->cellAt(0, 0).firstCursorPosition().insertText('<' + from + "> ");

    table->cellAt(0, 1).firstCursorPosition().insertText(message);

    QScrollBar *bar = textEdit->verticalScrollBar();

    bar->setValue(bar->maximum());

}

void ChatDialog::returnPressed()

{

    QString text = lineEdit->text();

    if (text.isEmpty())

        return;

    if (text.startsWith(QChar('/'))) {

        QColor color = textEdit->textColor();

        textEdit->setTextColor(Qt::red);

        textEdit->append(tr("! Unknown command: %1")

                         .arg(text.left(text.indexOf(' '))));

        textEdit->setTextColor(color);

    } else {

        client.sendMessage(text);

        appendMessage(myNickName, text);

    }

    lineEdit->clear();

}

void ChatDialog::newParticipant(const QString &nick)

{

    if (nick.isEmpty())

        return;

    QColor color = textEdit->textColor();

    textEdit->setTextColor(Qt::gray);

    textEdit->append(tr("* %1 has joined").arg(nick));

    textEdit->setTextColor(color);

    listWidget->addItem(nick);

}

void ChatDialog::participantLeft(const QString &nick)

{

    if (nick.isEmpty())

        return;

    QList<QListWidgetItem *> items = listWidget->findItems(nick,

                                                           Qt::MatchExactly);

    if (items.isEmpty())

        return;

    delete items.at(0);

    QColor color = textEdit->textColor();

    textEdit->setTextColor(Qt::gray);

    textEdit->append(tr("* %1 has left").arg(nick));

    textEdit->setTextColor(color);

}

void ChatDialog::showInformation()

{

    if (listWidget->count() == 1) {

        QMessageBox::information(this, tr("Chat"),

                                 tr("Launch several instances of this "

                                    "program on your local network and "

                                    "start chatting!"));

    }

}