#include "Menu.h"
#include "Constant.h"
#include "DatabaseManager.h"
#include "Log.h"
#include "ui_Menu.h"
#include <QDateTime>
#include <QDesktopWidget>
#include <QListView>
#include <QTimer>

#define CONTENT_ROW 6 // 列表行
#define CONTENT_COLUMN 6 // 列表列
#define CONTENT_CELL_HEIGHT 56 // 单元格高度

Menu::Menu(QWidget* parent)
    : QWidget(parent)
    , FocusWindow()
    , ui(new Ui::Menu)
{
    ui->setupUi(this);
    setAttribute(Qt::WA_WState_WindowOpacitySet);
    setWindowFlags(windowFlags() | Qt::FramelessWindowHint);
    setWindowOpacity(0.5);
    setFixedSize(800, 600);
    ui->stackedWidget->setCurrentIndex(0);
    ui->btnChannelSetting->setFocus();

    QDesktopWidget* deskdop = QApplication::desktop();
    QWidget::move((deskdop->width() - this->width()) / 2, (deskdop->height() - this->height()) / 2);

    ui->cmbYear->setView(new QListView());
    ui->cmbMonth->setView(new QListView());
    ui->cmbDay->setView(new QListView());

    // 设置ScrollArea为栅格布局
    QGridLayout* layout = new QGridLayout(ui->scrollArea);
    ui->scrollAreaWidgetContents->setLayout(layout);

    db = DatabaseManager::getInstace();
    if (!db->open())
        return;

    connect(ui->cmbYear, &QComboBox::currentTextChanged, [=](QString text) {
        renderComboBoxMonth();
    });
    connect(ui->cmbMonth, &QComboBox::currentTextChanged, [=](QString text) {
        renderComboBoxDay();
    });
    // 默认设置当前操作选择主通道
    currentChannel = DatabaseManager::MainChannel;
    QTimer::singleShot(200, [=] {
        emit curChannelChanged(Constant::MainChannel);
    });
}

Menu::~Menu()
{
    delete ui;
    delete db;
}

/**
 * @brief 重写菜单show方法
 */
void Menu::show()
{
    renderComboBoxYear();
    getContents();
    QWidget::show();
}

/**
 * @brief 设置是否显示通道选择
 * @param visible
 */
void Menu::setChannelSelectVisible(bool visible)
{
    ui->widget_chnSelect->setVisible(visible);
}

/**
 * @brief 渲染年份
 */
void Menu::renderComboBoxYear()
{
    QStringList years = db->getAllYears(currentChannel);

    ui->cmbYear->clear();
    for (auto& str : years) {
        ui->cmbYear->addItem(str);
    }
    ui->cmbYear->setCurrentIndex(0);
}

/**
 * @brief 渲染月份
 */
void Menu::renderComboBoxMonth()
{
    QString year = ui->cmbYear->currentText();
    if (year.isEmpty()) {
        return;
    }
    QStringList months = db->getAllMonths(currentChannel, year);
    ui->cmbMonth->clear();
    for (auto& str : months) {
        ui->cmbMonth->addItem(str);
    }
    ui->cmbMonth->setCurrentIndex(0);
}

/**
 * @brief 渲染天数
 */
void Menu::renderComboBoxDay()
{
    QString year = ui->cmbYear->currentText();
    QString month = ui->cmbMonth->currentText();
    if (year.isEmpty() || year.isEmpty()) {
        return;
    }
    QStringList days = db->getAllDays(currentChannel, year, month);
    ui->cmbDay->clear();
    for (auto& str : days) {
        ui->cmbDay->addItem(str);
    }
    ui->cmbDay->setCurrentIndex(0);
}

/**
 * @brief 获取数据
 */
void Menu::getContents()
{
    QVariantMap params;
    params["channel"] = currentChannel;
    params["year"] = ui->cmbYear->currentText();
    params["month"] = ui->cmbMonth->currentText();
    params["day"] = ui->cmbDay->currentText();
    contentList = db->get(params);
    renderContents();
}

/**
 * @brief 将视频名称列表渲染成一堆按钮放到ScrollArea中，6*6
 */
void Menu::renderContents()
{
    QGridLayout* layout = qobject_cast<QGridLayout*>(ui->scrollAreaWidgetContents->layout());

    // 清除原来的控件防止内存泄漏
    QList<QWidget*> widgets = ui->scrollAreaWidgetContents->findChildren<QWidget*>();
    for (QWidget* w : widgets) {
        delete w;
    }
    // 重新生成若干个按钮
    for (int i = 0; i < contentList.length(); i++) {
        // 文件名格式: yyyyMMddhhmmss.mp4，只将时分秒显示到界面上
        DatabaseManager::File file = contentList.at(i);
        QPushButton* btn = new QPushButton(file.time, ui->scrollArea);
        btn->setProperty("name", file.filename);
        btn->setMinimumHeight(CONTENT_CELL_HEIGHT);
        btn->setStyleSheet("QPushButton{border-radius: 5px;}");
        btn->setCheckable(true);
        btn->setAutoExclusive(true);
        btn->setObjectName(QString("btn_video_%1").arg(i));
        int row = i / CONTENT_COLUMN;
        int column = i % CONTENT_COLUMN;
        layout->addWidget(btn, row, column);
    }

    // 少于36个用空的widget占位置
    if (contentList.length() < CONTENT_ROW * CONTENT_COLUMN) {
        int lastRow = (contentList.length() - 1) / CONTENT_COLUMN;
        int lastColum = (contentList.length() - 1) % CONTENT_COLUMN;

        for (int i = lastRow; i < CONTENT_ROW; i++) {
            for (int j = 0; j < CONTENT_COLUMN; j++) {
                if (i == lastRow && j <= lastColum) {
                    continue;
                }
                QWidget* widget = new QWidget(ui->scrollArea);
                widget->setMinimumHeight(CONTENT_CELL_HEIGHT);
                layout->addWidget(widget, i, j);
            }
        }
    }
}

/**
 * @brief 移动
 * @param direction
 */
void Menu::move(Direction direction)
{
    QWidget* focusWidget = QApplication::focusWidget();
    // 当前焦点是否在展开后的ComboBox上
    bool isCmbPopup = (strcmp(focusWidget->metaObject()->className(), "QListView") == 0);
    // 下拉框展开，则只进行上下选择
    if (isCmbPopup) {
        // 随便赋值一个不影响功能的按键
        Qt::Key key = Qt::Key_Right;
        if (direction == Up) {
            key == Qt::Key_Up;
        } else if (direction == Down) {
            key == Qt::Key_Down;
        }
        QKeyEvent pressEvent(QEvent::KeyPress, key, Qt::NoModifier);
        QApplication::sendEvent(focusWidget, &pressEvent);
        QKeyEvent releaseEvent(QEvent::KeyRelease, key, Qt::NoModifier);
        QApplication::sendEvent(focusWidget, &releaseEvent);
    } else {
        focusNext(direction);
        focusWidget = QApplication::focusWidget();
        int drawedHeight = focusWidget->visibleRegion().boundingRect().height();
        int height = focusWidget->height();
        // 绘制的高度小于实际高度，则表示控件显示不完全
        if (drawedHeight < height) {
            ui->scrollArea->ensureWidgetVisible(focusWidget);
        }
        if (focusWidget == ui->btnChannelSetting) {
            ui->btnChannelSetting->setChecked(true);
            ui->stackedWidget->setCurrentIndex(0);
        } else if (focusWidget == ui->btnPlayback) {
            ui->btnPlayback->setChecked(true);
            ui->stackedWidget->setCurrentIndex(1);
        }
    }
}

/**
 * @brief 确认
 */
void Menu::confirm()
{
    int index = ui->stackedWidget->currentIndex();
    QWidget* focusWidget = QApplication::focusWidget();
    switch (index) {
    // 通道设置界面
    case 0: {
        QPushButton* btn = qobject_cast<QPushButton*>(focusWidget);
        btn->setChecked(true);
        if (btn == ui->btn_hdmi_1) {
            emit btnHdmi1Checked();
        } else if (btn == ui->btn_hdmi_2) {
            emit btnHdmi2Checked();
        } else if (btn == ui->btn_vga_1) {
            emit btnVga1Checked();
        } else if (btn == ui->btn_vga_2) {
            emit btnVga2Checked();
        }
        break;
    }
    // 回放界面
    case 1: {
        // 通道选择时按下确认
        if (focusWidget == ui->btn_channel_1 || focusWidget == ui->btn_channel_2) {
            QPushButton* btn = qobject_cast<QPushButton*>(focusWidget);
            btn->setChecked(true);
            if (btn == ui->btn_channel_1) {
                currentChannel = DatabaseManager::MainChannel;
                emit curChannelChanged(Constant::MainChannel);
            } else {
                currentChannel = DatabaseManager::SecondaryChannel;
                emit curChannelChanged(Constant::SecondaryChannel);
            }
            renderComboBoxYear();
        }
        // 下拉框未展开时按下确认
        else if (strcmp(focusWidget->metaObject()->className(), "QComboBox") == 0) {
            QComboBox* cmb = qobject_cast<QComboBox*>(focusWidget);
            cmb->showPopup();
        }
        // 下拉框展开时按下确认
        else if (strcmp(focusWidget->metaObject()->className(), "QListView") == 0) {
            // QComboBox的层级
            // QComboBox
            // |- QComboBoxPrivateContainer(Popup widget)
            //     |- QListView(or QListWidget)
            //         |-QViewPort(Child of QListView)
            QComboBox* cmb = static_cast<QComboBox*>(focusWidget->parent()->parent());
            if (cmb) {
                cmb->hidePopup();
            }
        }
        // 选择视频时按下确认
        else if (focusWidget->objectName().contains("btn_video")) {
            QPushButton* btn = qobject_cast<QPushButton*>(focusWidget);
            btn->setChecked(true);
            QString filename = btn->property("name").toString();
            emit btnVideoClicked(filename);
            currentFilename = filename;
        }
        // 确认按钮按下确认
        else if (focusWidget->objectName() == "btn_done") {
            getContents();
        }
        break;
    }
    default:
        break;
    }
}

/**
 * @brief 点击查找当前列表中的上一个视频和下一个视频
 */
void Menu::clickVideo(QString type)
{
    getContents();
    int index = -1;
    for (int i = 0; i < contentList.length(); i++) {
        DatabaseManager::File file = contentList[i];
        if (file.filename == currentFilename) {
            index = i;
            break;
        }
    }
    QString filename;
    // 上一个视频
    if (type == "previous") {
        if (index == 0) {
            emit btnVideoClicked("first");
            return;
        }
        filename = contentList[index - 1].filename;
    }
    // 下一个视频
    else {
        if (index == contentList.length() - 1) {
            emit btnVideoClicked("last");
            return;
        }
        filename = contentList[index + 1].filename;
    }
    filename = contentList[index + 1].filename;
    emit btnVideoClicked(filename);
    QString h = filename.mid(8, 2);
    QString m = filename.mid(10, 2);
    QString s = filename.mid(12, 2);
    QString str = QString("%1:%2:%3").arg(h).arg(m).arg(s);
    // 选中要播放的按钮
    QList<QPushButton*> btns = ui->scrollArea->findChildren<QPushButton*>();
    for (QPushButton* btn : btns) {
        if (btn->text() == str) {
            btn->setChecked(true);
        }
    }
}

/**
 * @brief 遍历当前窗体可以获取焦点的所有控件
 */
QList<QWidget*> Menu::getAllFocusabelWidget()
{
    QList<QWidget*> list = findChildren<QWidget*>();
    QList<QWidget*> result;
    for (int i = 0; i < list.length(); i++) {
        QWidget* w = list.at(i);
        if (w->focusPolicy() == Qt::NoFocus || !w->isVisible())
            continue;
        else {
            result.push_back(w);
        }
    }
    return result;
}