#include "P14_AtlasPage.h"
#include "ui_P14_AtlasPage.h"

#include <QDir>
#include <QDebug>
#include <QCoreApplication>
#include <QMouseEvent>
#include <QScrollArea>
#include <QScrollBar>
P14_AtlasPage::P14_AtlasPage(QWidget *parent)
    : QWidget(parent), ui(new Ui::P14_AtlasPage)
{
    ui->setupUi(this);
    WinInit();
}

P14_AtlasPage::~P14_AtlasPage()
{
    delete ui;
}

void P14_AtlasPage::WinInit()
{

    /* ----- 1. 扫描三组图 ----- */
    QString base = "./ProgramConfig/随机图册库";
    QDir dir1(base + "/电气图");
    QDir dir2(base + "/机械图");
    QDir dir3(base + "/液压图");

    auto scan = [](QDir d, QMap<QString,QString> &map, QStringList &list){
        d.setNameFilters({"*.png","*.PNG"});
        d.setFilter(QDir::Files | QDir::NoDotAndDotDot);
        for (const QString &f : d.entryList()){
            map[f] = d.absoluteFilePath(f);
            list.append(f);
        }
    };

    scan(dir1, Atlas1, AtStr1);
    scan(dir2, Atlas2, AtStr2);
    scan(dir3, Atlas3, AtStr3);

    /* ----- 2. 界面初始 ----- */
    CurrentAtlas = 1;
    ui->LV_FileList->addItems(AtStr1);
    ui->Label_Img->setParent(nullptr);
    ui->scrollArea->setWidget(ui->Label_Img);
    ui->scrollArea->setWidgetResizable(false);
    ui->Label_Img->installEventFilter(this);
    ui->Label_Zoom->setText("100.00");
    on_LV_FileList_currentTextChanged(AtStr1[0]);

}

/* ---------- 列表换图 ---------- */
void P14_AtlasPage::on_LV_FileList_currentTextChanged(const QString &currentText)
{

    if (currentText.isEmpty()) return;
    ui->Label_Img->setText("");
    QString path;
    if(CurrentAtlas ==1){
        path = Atlas1.value(currentText);          // 默认先电气图
    }else if(CurrentAtlas ==2){
        path = Atlas2.value(currentText);          // 默认先电气图
    }else if(CurrentAtlas ==3){
        path = Atlas3.value(currentText);          // 默认先电气图
    }

    QPixmap pix(path);
    if (!pix.isNull()) {
        Img_W = pix.width();
        Img_H = pix.height();
        Img_Zoom = 0.238f;
        ui->Label_Zoom->setText("23.8 %");
        ui->Label_Img->setPixmap(pix);
        ui->Label_Img->resize(788, 557);
        ui->Label_Img->setScaledContents(true);
    } else {
        ui->Label_Img->clear();
        ui->Label_Img->setText("图册加载失败");
    }
}

/* ---------- 放大 ---------- */
void P14_AtlasPage::on_But_Magnify_clicked()
{
    if (Img_Zoom >= 1.3f) return;
    if(Img_Zoom < 0.25f)
        Img_Zoom = 0.25f;
    else
        Img_Zoom += 0.05f;
    ui->Label_Zoom->setText(QString::number(Img_Zoom*100) + " %");
    ui->Label_Img->resize(Img_W * Img_Zoom, Img_H * Img_Zoom);
}

/* ---------- 缩小 ---------- */
void P14_AtlasPage::on_But_Reduce_clicked()
{
    if (Img_Zoom <= 0.238f) return;
    Img_Zoom -= 0.05f;
    if (Img_Zoom < 0.25f) Img_Zoom = 0.238f;
    ui->Label_Zoom->setText(QString::number(Img_Zoom*100) + " %");
    ui->Label_Img->resize(Img_W * Img_Zoom, Img_H * Img_Zoom);
}

/* ---------- 底部三按钮 ---------- */
void P14_AtlasPage::on_But_Atlas_1_clicked()
{
    ui->LV_FileList->clear();
    ui->LV_FileList->addItems(AtStr1);
    CurrentAtlas = 1;
}
void P14_AtlasPage::on_But_Atlas_2_clicked()
{
    ui->LV_FileList->clear();
    ui->LV_FileList->addItems(AtStr2);
    CurrentAtlas = 2;
}
void P14_AtlasPage::on_But_Atlas_3_clicked()
{
    ui->LV_FileList->clear();
    ui->LV_FileList->addItems(AtStr3);
    CurrentAtlas = 3;
}

/* ---------- 鼠标拖拽平移 ---------- */
bool P14_AtlasPage::eventFilter(QObject *obj, QEvent *ev)
{
    if (obj != ui->Label_Img) return false;

    switch (ev->type()) {
    case QEvent::MouseButtonPress:
        if (static_cast<QMouseEvent*>(ev)->button() == Qt::LeftButton) {
            dragging = true;
            dragStart = static_cast<QMouseEvent*>(ev)->pos();
            ui->Label_Img->setCursor(Qt::ClosedHandCursor);
            return true;
        }
        break;
    case QEvent::MouseMove:
        if (dragging) {
            auto *e = static_cast<QMouseEvent*>(ev);
            int dx = e->pos().x() - dragStart.x();
            int dy = e->pos().y() - dragStart.y();
            ui->scrollArea->horizontalScrollBar()->setValue(
                ui->scrollArea->horizontalScrollBar()->value() - dx);
            ui->scrollArea->verticalScrollBar()->setValue(
                ui->scrollArea->verticalScrollBar()->value() - dy);
            dragStart = e->pos();
            return true;
        }
        break;
    case QEvent::MouseButtonRelease:
        if (dragging && static_cast<QMouseEvent*>(ev)->button() == Qt::LeftButton) {
            dragging = false;
            ui->Label_Img->unsetCursor();
            return true;
        }
        break;
    default: break;
    }
    return false;
}