#include "FileManageWidget.h"
#include "ui_FileManageWidget.h"
#include <QDebug>
#include "SysPara.h"
#include <QDir>
#include <QStringList>
#include <QFileInfo>
#include <QMessageBox>
#include <QTextStream>

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

    // 安装事件过滤器用于判断当前焦点位于系统文件列表还是U盘文件列表，高亮获得焦点的列表
    ui->systemFileListView->installEventFilter(this);
    ui->udiskFileListView->installEventFilter(this);

    // 将各自列表所查找的根目录存放到各自的动态属性中
    // updateFileListView方法将会从属性中获取对应的查找根路径用于更新文件列表
    ui->systemFileListView->setProperty("searchPath", DOC_ROOT_DIR);
    ui->udiskFileListView->setProperty("searchPath", UDISK_DOC_ROOT_DIR);

    updateUDiskDevList();

    m_focusedListView = ui->systemFileListView;
    m_focusedListView->setFocus();

    onFilterCBoxSelectChanged(ui->filterCBox->currentIndex());
}

FileManageWidget::~FileManageWidget()
{
    ui->systemFileListView->removeEventFilter(this);
    ui->udiskFileListView->removeEventFilter(this);
    delete ui;
}

bool FileManageWidget::eventFilter(QObject *watched, QEvent *event)
{
    // 仅处理系统文件列表或U盘文件列表
    if(watched != ui->systemFileListView && watched != ui->udiskFileListView) {
        return false;
    }

    if(event->type() != QEvent::FocusIn) {
        return false;
    }

    // 为获得焦点的列表视图改变边框色，高亮显示

    if(m_focusedListView == watched) {
        return false;
    }

    QWidget * backgroundPanel = dynamic_cast<QWidget *>(m_focusedListView->parent());
    auto palette = backgroundPanel->palette();
    palette.setColor(backgroundPanel->backgroundRole(), QColor("white"));
    backgroundPanel->setPalette(palette);

    m_focusedListView = dynamic_cast<QListWidget *>(watched);
    backgroundPanel = dynamic_cast<QWidget *>(watched->parent());
    palette = backgroundPanel->palette();
    palette.setColor(backgroundPanel->backgroundRole(), QColor(175, 218, 223));
    backgroundPanel->setPalette(palette);

    return false;
}

void FileManageWidget::onFilterCBoxSelectChanged(int i)
{
    if(i < JobFile || i > All) {
        qWarning() << "无效的过滤类型编号: " << i;
        i = All;
        ui->filterCBox->setCurrentIndex(i);
    }

    m_currFilterType = i;
    updateFileListView(ui->systemFileListView);
    updateFileListView(ui->udiskFileListView);
}

void FileManageWidget::onExportBtnClicked()
{
    copyFiles(ui->systemFileListView, ui->udiskFileListView);
    updateFileListView(ui->udiskFileListView);
}

void FileManageWidget::onImportBtnClicked()
{
    copyFiles(ui->udiskFileListView, ui->systemFileListView);
    updateFileListView(ui->systemFileListView);
}

void FileManageWidget::onSelectAllBtnClicked()
{
    if(!m_focusedListView)
        return;

    m_focusedListView->selectAll();
}

void FileManageWidget::onCancelAllBtnClicked()
{
    if(!m_focusedListView)
        return;

    m_focusedListView->clearSelection();
}

void FileManageWidget::onDelSelectedBtnClicked()
{
    if(!m_focusedListView)
        return;

    auto items = m_focusedListView->selectedItems();
    for(auto item : items) {
        auto filename = item->data(AbsPathRole).toString();
        QString cmd = QString("rm %1").arg(filename);
        int ret = system(cmd.toLatin1().constData());
        qInfo() << "Command: " << cmd << ", result: " << ret;
    }

    updateFileListView(m_focusedListView);
}

void FileManageWidget::updateUDiskDevList()
{
    QDir dir(UDISK_DOC_ROOT_DIR);
    if(!dir.exists()) {
        ui->udiskSelectBox->clear();
        return;
    }

    if(ui->udiskSelectBox->currentText() != tr("U盘")){
        ui->udiskSelectBox->clear();
        ui->udiskSelectBox->addItem(tr("U盘"));
        ui->udiskSelectBox->setCurrentIndex(0);
    }

    updateFileListView(ui->udiskFileListView);
}

int FileManageWidget::updateFileListView(QListWidget* listView)
{
    QString searchPath = listView->property("searchPath").toString();

    // 判断目录是否存在
    QDir dir(searchPath);
    if(!dir.exists()) {
        qCritical() << "Cannot open path: " << searchPath;
        return -1;
    }

    // 根据过滤类型设置过滤器字符串
    QStringList filters;
    switch(m_currFilterType) {
    case JobFile:
        filters << "*.xml";
        break;
    case Image:
        filters << "*.png" << "*.jpeg" << "*.gif" << "*.jpg" <<  "*.bmp"<<  "*.BMP";
        break;
    case Font:
        filters << "*.ttf" << "*.otf";
        break;
    case All:
    default:
        filters << "*.xml" << "*.png" << "*.jpeg" << "*.gif" << "*.jpg" <<  "*.bmp"<<  "*.BMP" << "*.html" << "*.ttf" << "*.otf";
        break;
    }

    // 获取过滤后的文件集合
    auto fileInfoList = dir.entryInfoList(filters, QDir::Files);

    // 清理视图并为其重新添加文件列表
    listView->clear();
    for(const auto& fileInfo : fileInfoList) {
        auto absPath = fileInfo.absoluteFilePath();
        QListWidgetItem *item = new QListWidgetItem();
        item->setText(fileInfo.fileName());
        item->setData(AbsPathRole, absPath);
        listView->addItem(item);
    }

    qInfo() << "Scan path: " << searchPath << ", files: " << fileInfoList.size() << ", target: " << listView->objectName();
    return fileInfoList.size();
}

void FileManageWidget::copyFiles(QListWidget *from, QListWidget *to)
{
    // 获取目的地目录
    auto destPath = to->property("searchPath").toString();

    auto items = from->selectedItems();
    for(auto item : items) {
        auto filename = item->data(AbsPathRole).toString();
        QString cmd = QString("cp %1 %2").arg(filename).arg(destPath);
        auto ret = system(cmd.toLatin1().constData());
        qInfo() << "Command: " << cmd << ", result: " << ret;
    }
}