#include "listeditordialog.h"
#include "ui_listeditordialog.h"

#include <QChar>
#include <QList>
#include <QStringList>

ListEditorDialog::ListEditorDialog(QWidget *parent, QString listStr, QChar separator) :
    QDialog(parent),
    ui(new Ui::ListEditorDialog)
{
    ui->setupUi(this);
    QStringList itemList = listStr.split(separator);
    for (int i = 0;i < itemList.count();i++) {
        QString currentStr = itemList[i].trimmed();
        if (currentStr.length() != 0) {
            ui->itemListWidget->addItem(currentStr);
        }
    }
    origListStr = listStr;
    listModified = false;
    connect(ui->addItemButton, &QPushButton::clicked, this, &ListEditorDialog::onAddItemButtonClicked);
    connect(ui->removeItemButton, &QPushButton::clicked, this, &ListEditorDialog::onRemoveItemButtonClicked);
    connect(ui->moveUpItemButton, &QPushButton::clicked, this, &ListEditorDialog::onMoveUpItemButtonClicked);
    connect(ui->moveDownItemButton, &QPushButton::clicked, this, &ListEditorDialog::onMoveDownItemButtonClicked);
    connect(ui->okButton, &QPushButton::clicked, this, &ListEditorDialog::onOkButtonClicked);
    connect(ui->cancelButton, &QPushButton::clicked, this, &ListEditorDialog::onCancelButtonClicked);
}

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

QString ListEditorDialog::list()
{
    if (!listModified) {
        return origListStr;
    } else {
        QStringList final;
        for (int i = 0;i < ui->itemListWidget->count();i++) {
            final.append(ui->itemListWidget->item(i)->text());
        }
        return final.join(',');
    }
}

void ListEditorDialog::onAddItemButtonClicked()
{
    if (ui->newItemLineEdit->text().trimmed() != "") {
        ui->itemListWidget->addItem(ui->newItemLineEdit->text().trimmed());
    }
    ui->newItemLineEdit->setText("");
}

void ListEditorDialog::onRemoveItemButtonClicked()
{
    if (ui->itemListWidget->count() != 0) {
        delete ui->itemListWidget->item(ui->itemListWidget->currentRow());
    }
}

void ListEditorDialog::onMoveUpItemButtonClicked()
{
    bool isBottomItemSelected = ui->itemListWidget->currentRow() == ui->itemListWidget->count() - 1;
    if (ui->itemListWidget->count() != 0 && ui->itemListWidget->currentRow() != 0) {
        ui->itemListWidget->insertItem(ui->itemListWidget->currentRow() - 1, ui->itemListWidget->takeItem(ui->itemListWidget->currentRow()));

        // Somehow the actively selected item ends up shifting down a row during the removal and reinsertion of the current item.
        // If the actively selected item is the bottommost one, this has no effect, and so we only move up one row.
        // Otherwise, we need to move up two rows to compensate.
        if (isBottomItemSelected) {
            ui->itemListWidget->setCurrentRow(ui->itemListWidget->currentRow() - 1);
        } else {
            ui->itemListWidget->setCurrentRow(ui->itemListWidget->currentRow() - 2);
        }
    }
}

void ListEditorDialog::onMoveDownItemButtonClicked()
{
    if (ui->itemListWidget->count() != 0 && ui->itemListWidget->currentRow() != ui->itemListWidget->count() - 1)
    {
        ui->itemListWidget->insertItem(ui->itemListWidget->currentRow() + 1, ui->itemListWidget->takeItem(ui->itemListWidget->currentRow()));
        ui->itemListWidget->setCurrentRow(ui->itemListWidget->currentRow() + 1);
    }
}

void ListEditorDialog::onOkButtonClicked()
{
    listModified = true;
    this->close();
}

void ListEditorDialog::onCancelButtonClicked()
{
    listModified = false;
    this->close();
}