#include "MainWindow.h"
#include "ui_MainWindow.h"

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

    // Initialize UI
    updateCounterLabel();

    // Connect buttons to slots
    connect(ui->buttonIncrement, &QPushButton::clicked, this, &MainWindow::onIncrementClicked);
    connect(ui->buttonReset, &QPushButton::clicked, this, &MainWindow::onResetClicked);

    // slider business
    connect(ui->slider,     &QSlider::valueChanged,      this, &MainWindow::onSliderValueChanged);
    connect(ui->inputMin,   &QLineEdit::editingFinished, this, &MainWindow::onMinChanged);
    connect(ui->inputMax,   &QLineEdit::editingFinished, this, &MainWindow::onMaxChanged);
    connect(ui->inputStep,  &QLineEdit::editingFinished, this, &MainWindow::onStepChanged);
    connect(ui->inputValue, &QLineEdit::editingFinished, this, &MainWindow::onValueChanged);

}

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

void MainWindow::onIncrementClicked() {
    counter_++;
    updateCounterLabel();
}

void MainWindow::onResetClicked() {
    counter_ = 0;
    updateCounterLabel();
}

void MainWindow::updateCounterLabel() {
    ui->labelCounter->setText(QString::number(counter_));
}

// allows only numbers to be set
void MainWindow::onSliderValueChanged(int value) { 
    QSignalBlocker blocker(ui->inputValue);
    ui->inputValue->setText(QString::number(value));
}

// allows only values within the min, max to be set by the text field
void MainWindow::onValueChanged() {
    bool ok = false;
    int value = ui->inputValue->text().toInt(&ok);
    if(!ok) return;

    value = qBound(ui->slider->minimum(), value, ui->slider->maximum());
    ui->slider->setValue(value);
}

void MainWindow::applySliderRange() {
    bool minOk, maxOk;
    int min = ui->inputMin->text().toInt(&minOk);
    int max = ui->inputMax->text().toInt(&maxOk);
    if(!minOk || !maxOk || min > max) return;
    
    ui->slider->setRange(min, max);

    syncValueToUi(ui->slider->value());
}

void MainWindow::applySliderStep() {
    bool ok;
    int step = ui->inputStep->text().toInt(&ok);
    if(!ok || step <= 0) return;
    
    ui->slider->setSingleStep(step);
    ui->slider->setPageStep(step);
}

void MainWindow::syncValueToUi(int value) {
    QSignalBlocker block1(ui->slider);
    QSignalBlocker block2(ui->inputValue);

    value = qBound(ui->slider->minimum(), value, ui->slider->maximum());
    ui->slider->setValue(value);
    ui->inputValue->setText(QString::number(value));
}