#include "ItemGeneralSettings.h"
#include "ui_ItemGeneralSettings.h"
#include <QDebug>

ItemGeneralSettings::ItemGeneralSettings(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::ItemGeneralSettings)
{
    ui->setupUi(this);
    m_directionButtonGroup.addButton(ui->normalRBtn, NORMAL);
    m_directionButtonGroup.addButton(ui->verMirrorRBtn, MIRROR_V);
    m_directionButtonGroup.addButton(ui->horMirrorRBtn, MIRROR_H);
    m_directionButtonGroup.addButton(ui->mirrorRBtn, MIRROR_VH);
    m_directionButtonGroup.addButton(ui->m90NHorRBtn, MIRROR_H_R270);
    m_directionButtonGroup.addButton(ui->a90RBtn, R90);
    m_directionButtonGroup.addButton(ui->m90RBtn, R270);
    m_directionButtonGroup.addButton(ui->m90NVerRBtn, MIRROR_V_R270);

    connect(&m_directionButtonGroup, static_cast<void(QButtonGroup::*)(int)>(&QButtonGroup::buttonClicked),
            this, &ItemGeneralSettings::ondirectionChanged);
    connect(ui->boldSpinBox, static_cast<void(QSpinBox::*)(int)>(&QSpinBox::valueChanged),
            this, &ItemGeneralSettings::onBoldSpinBoxValueChanged);
    connect(ui->txtSpanSpinBox, static_cast<void(QSpinBox::*)(int)>(&QSpinBox::valueChanged),
            this, &ItemGeneralSettings::onLetterSpaceSpinBoxChanged);
    connect(ui->invertCheckBox, &QCheckBox::stateChanged,
            this, [this](int state) { onColorReversalCheckBoxChecked(state == Qt::Checked); });

	initUI();
}

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

void ItemGeneralSettings::edit(PicTextItem *item)
{
    m_currItem = item;
    
    // 从item快照创建ViewModel（如果item为空，使用默认值）
    setViewModel(ItemGeneralSettingsVM::fromItem(item));
}

void ItemGeneralSettings::initUI()
{
    ui->densitySpinBox->setValue(0);
    ui->invertCheckBox->setChecked(false);
    ui->alternateCheckBox->setChecked(false);
    ui->boldSpinBox->setValue(0);
    ui->txtSpanSpinBox->setValue(0);
    ui->normalRBtn->setChecked(true);
    ui->applyCounterCheckBox->setChecked(false);
    ui->counterIDSpinBox->setValue(0);
}

void ItemGeneralSettings::setViewModel(const ItemGeneralSettingsVM &vm)
{
    m_vmSnapshot = vm;
    m_vm = vm;
    
    // 阻止信号以避免重复回调
    auto blockBold = ui->boldSpinBox->blockSignals(true);
    auto blockSpan = ui->txtSpanSpinBox->blockSignals(true);
    auto blockInvert = ui->invertCheckBox->blockSignals(true);
    
    // 根据m_vm更新UI显示
    ui->boldSpinBox->setValue(m_vm.boldMultiple);
    ui->txtSpanSpinBox->setValue(m_vm.letterSpace);
    
    auto dirBtn = m_directionButtonGroup.button(m_vm.direction);
    if (dirBtn) {
        dirBtn->setChecked(true);
    }
    
    ui->invertCheckBox->setChecked(m_vm.colorReversal);
    
    // 恢复信号
    ui->boldSpinBox->blockSignals(blockBold);
    ui->txtSpanSpinBox->blockSignals(blockSpan);
    ui->invertCheckBox->blockSignals(blockInvert);
    
    // 字间距可见性由item的类型决定
    switch(m_vm.sourceType) {
    case SourceType::TEXT:
    case SourceType::DATETIME:
    case SourceType::SCHEDULE_SHIFT:
        ui->letterSpacePanel->setVisible(true);
        break;
    case SourceType::UNKNOWN:
    default:
        ui->letterSpacePanel->setVisible(false);
        break;
    }
    
    updatePreview();
}

void ItemGeneralSettings::applyToItem(PicTextItem *item)
{
    if (!item) {
        return;
    }
    
    // VM的属性被逐一应用到item
    item->setDirection(m_vm.direction);
    item->setBoldMultiple(m_vm.boldMultiple);
    item->setLetterSpace(m_vm.letterSpace);
    item->setColorReversal(m_vm.colorReversal);
    item->applyModify();
}

void ItemGeneralSettings::ondirectionChanged(int dir)
{
    // 只更新VM，不直接修改item
    m_vm.direction = ItemDirectionType(dir);
    updatePreview();
}

void ItemGeneralSettings::onBoldSpinBoxValueChanged(int multiple)
{
    // 只更新VM
    m_vm.boldMultiple = multiple;
    updatePreview();
}

void ItemGeneralSettings::onLetterSpaceSpinBoxChanged(int space)
{
    // 只更新VM
    m_vm.letterSpace = space;
    updatePreview();
}

void ItemGeneralSettings::onColorReversalCheckBoxChecked(bool b)
{
    // 只更新VM
    m_vm.colorReversal = b;
    updatePreview();
}

void ItemGeneralSettings::updatePreview()
{
    // 预览需要基于item的source和m_vm的属性组合渲染
    // 如果m_currItem为空，显示空图像
    if (!m_currItem) {
        if(m_vm.imageGenerator) {
            ui->previewWidget->setImg(m_vm.imageGenerator());
        }
        else {
            ui->previewWidget->setImg(QImage());
        }
        return;
    }
    
    // 临时应用VM到item以获取预览，随后还原
    auto backupDir = m_currItem->direction();
    auto backupBold = m_currItem->boldMultiple();
    auto backupSpace = m_currItem->letterSpace();
    auto backupReverse = m_currItem->colorReversal();
    
    m_currItem->setDirection(m_vm.direction);
    m_currItem->setBoldMultiple(m_vm.boldMultiple);
    m_currItem->setLetterSpace(m_vm.letterSpace);
    m_currItem->setColorReversal(m_vm.colorReversal);
    m_currItem->applyModify();
    
    ui->previewWidget->setImg(m_currItem->preview());
    
    // 还原原始状态（preview()后item的属性不应该被留下改动）
    m_currItem->setDirection(backupDir);
    m_currItem->setBoldMultiple(backupBold);
    m_currItem->setLetterSpace(backupSpace);
    m_currItem->setColorReversal(backupReverse);
    m_currItem->applyModify();
}