#include <QFileDialog>

#include "addressbook.h"
#include "ui_addressbook.h"

AddressBook::AddressBook(QWidget *parent)
    : QWidget(parent), ui(new Ui::AddressBook)
{
    ui->setupUi(this);

    ui->nameLine->setReadOnly(true);
    ui->addressText->setReadOnly(true);
    ui->submitButton->hide();
    ui->cancelButton->hide();
    ui->nextButton->setEnabled(false);
    ui->previousButton->setEnabled(false);
    ui->editButton->setEnabled(false);
    ui->removeButton->setEnabled(false);

    connect(ui->addButton, SIGNAL(clicked()), this,
                SLOT(addContact()));
    connect(ui->submitButton, SIGNAL(clicked()), this,
                SLOT(submitContact()));
    connect(ui->cancelButton, SIGNAL(clicked()), this,
                SLOT(cancel()));
    connect(ui->nextButton, SIGNAL(clicked()), this,
                SLOT(next()));
    connect(ui->previousButton, SIGNAL(clicked()), this,
                SLOT(previous()));
    connect(ui->editButton, SIGNAL(clicked()), this,
                SLOT(editContact()));
    connect(ui->removeButton, SIGNAL(clicked()), this,
                SLOT(removeContact()));
    connect(ui->findButton, SIGNAL(clicked()), this,
                SLOT(findContact()));
    //! [connectSlots]
    connect(ui->loadButton, SIGNAL(clicked()), this,
                SLOT(loadFromFile()));
    connect(ui->saveButton, SIGNAL(clicked()), this,
                SLOT(saveToFile()));
    //! [connectSlots]

    setWindowTitle(tr("Simple Address Book"));
}

AddressBook::~AddressBook()
{
    delete ui;
}

void AddressBook::addContact()
{
    oldName = ui->nameLine->text();
    oldAddress = ui->addressText->toPlainText();

    ui->nameLine->clear();
    ui->addressText->clear();

    updateInterface(AddingMode);
}

void AddressBook::submitContact()
{
    QString name = ui->nameLine->text();
    QString address = ui->addressText->toPlainText();

    if (name == "" || address == "") {
        QMessageBox::information(this, tr("Empty Field"),
            tr("Please enter a name and address."));
        updateInterface(NavigationMode);
        return;
    }

    if (currentMode == AddingMode) {

        if (!contacts.contains(name)) {
            contacts.insert(name, address);
            QMessageBox::information(this, tr("Add Successful"),
                tr("\"%1\" has been added to your address book.").arg(name));
        } else {
            QMessageBox::information(this, tr("Add Unsuccessful"),
                tr("Sorry, \"%1\" is already in your address book.").arg(name));
        }

    } else if (currentMode == EditingMode) {

        if (oldName != name) {
            if (!contacts.contains(name)) {
                QMessageBox::information(this, tr("Edit Successful"),
                    tr("\"%1\" has been edited in your address book.").arg(oldName));
                contacts.remove(oldName);
                contacts.insert(name, address);
            } else  {
                QMessageBox::information(this, tr("Edit Unsuccessful"),
                    tr("Sorry, \"%1\" is already in your address book.").arg(name));
            }
        } else if (oldAddress != address) {
            QMessageBox::information(this, tr("Edit Successful"),
                tr("\"%1\" has been edited in your address book.").arg(name));
            contacts[name] = address;
        }
    }
    updateInterface(NavigationMode);
}

void AddressBook::cancel()
{
    ui->nameLine->setText(oldName);
    ui->nameLine->setReadOnly(true);

    updateInterface(NavigationMode);
}

void AddressBook::next()
{
    QString name = ui->nameLine->text();
    QMap<QString, QString>::iterator i = contacts.find(name);

    if (i != contacts.end())
        i++;
    if (i == contacts.end())
        i = contacts.begin();

    ui->nameLine->setText(i.key());
    ui->addressText->setText(i.value());
}

void AddressBook::previous()
{
    QString name = ui->nameLine->text();
    QMap<QString, QString>::iterator i = contacts.find(name);

    if (i == contacts.end()) {
        ui->nameLine->clear();
        ui->addressText->clear();
        return;
    }

    if (i == contacts.begin())
        i = contacts.end();

    i--;
    ui->nameLine->setText(i.key());
    ui->addressText->setText(i.value());
}

void AddressBook::editContact()
{
    oldName = ui->nameLine->text();
    oldAddress = ui->addressText->toPlainText();

    updateInterface(EditingMode);
}

void AddressBook::removeContact()
{
    QString name = ui->nameLine->text();
    QString address = ui->addressText->toPlainText();

    if (contacts.contains(name)) {
        int button = QMessageBox::question(this,
            tr("Confirm Remove"),
            tr("Are you sure you want to remove \"%1\"?").arg(name),
            QMessageBox::Yes | QMessageBox::No);

        if (button == QMessageBox::Yes) {
            previous();
            contacts.remove(name);

            QMessageBox::information(this, tr("Remove Successful"),
                tr("\"%1\" has been removed from your address book.").arg(name));
        }
    }

    updateInterface(NavigationMode);
}

void AddressBook::updateInterface(Mode mode)
{
    currentMode = mode;

    switch (currentMode) {

    case AddingMode:
    case EditingMode:

        ui->nameLine->setReadOnly(false);
        ui->nameLine->setFocus(Qt::OtherFocusReason);
        ui->addressText->setReadOnly(false);

        ui->addButton->setEnabled(false);
        ui->editButton->setEnabled(false);
        ui->removeButton->setEnabled(false);

        ui->nextButton->setEnabled(false);
        ui->previousButton->setEnabled(false);

        ui->submitButton->show();
        ui->cancelButton->show();
        break;

    case NavigationMode:

        if (contacts.isEmpty()) {
            ui->nameLine->clear();
            ui->addressText->clear();
        }

        ui->nameLine->setReadOnly(true);
        ui->addressText->setReadOnly(true);
        ui->addButton->setEnabled(true);

        int number = contacts.size();
        ui->editButton->setEnabled(number >= 1);
        ui->removeButton->setEnabled(number >= 1);
        ui->findButton->setEnabled(number > 2);
        ui->nextButton->setEnabled(number > 1);
        ui->previousButton->setEnabled(number >1);

        ui->submitButton->hide();
        ui->cancelButton->hide();
        break;
    }
}

void AddressBook::findContact()
{
    FindDialog dialog;

    if (dialog.exec() == QDialog::Accepted) {
        QString contactName = dialog.findText();

        if (contacts.contains(contactName)) {
            ui->nameLine->setText(contactName);
            ui->addressText->setText(contacts.value(contactName));
        } else {
            QMessageBox::information(this, tr("Contact Not Found"),
                tr("Sorry, \"%1\" is not in your address book.").arg(contactName));
            return;
        }
    }

    updateInterface(NavigationMode);
}

//! [saveToFile part1]
void AddressBook::saveToFile()
{
    QString fileName = QFileDialog::getSaveFileName(this,
        tr("Save Address Book"), "",
        tr("Address book (*.abk);; AllFiles (*)"));
//! [saveToFile part1]

//! [saveToFile part2]
    if (fileName.isEmpty())
        return;
    else {
        QFile file(fileName);

        if (!file.open(QIODevice::WriteOnly)) {
            QMessageBox::information(this, tr("Unable to open file"),
                file.errorString());
            return;
        }
//! [saveToFile part2]

//! [saveToFile part3]
        QDataStream out(&file);
        out.setVersion(QDataStream::Qt_4_5);
        out << contacts;
    }
}
//! [saveToFile part3]

//! [loadFromFile part1]
void AddressBook::loadFromFile()
{
    QString fileName = QFileDialog::getOpenFileName(this,
        tr("Open Address Book"), "",
        tr("Address Book(*.abk);; All Files(*)"));
//! [loadFromFile part1]

//! [loadFromFile part2]
    if (fileName.isEmpty())
        return;
    else {
        QFile file(fileName);

        if (!file.open(QIODevice::ReadOnly)) {
            QMessageBox::information(this, tr("Unable to open file"),
                file.errorString());
            return;
        }

        QDataStream in(&file);
        in.setVersion(QDataStream::Qt_4_5);
        contacts.clear();   // remove all items
        in >> contacts;
//! [loadFromFile part2]

//! [loadFromFile part3]
        if (contacts.isEmpty()) {
            QMessageBox::information(this, tr("No contacts in file"),
                tr("The file you are attempting to open contains no contacts."));
        } else {
            QMap<QString, QString>::iterator i = contacts.begin();
            ui->nameLine->setText(i.key());
            ui->addressText->setText(i.value());
        }
    }

    updateInterface(NavigationMode);
}
//! [loadFromFile part3]
