#include "mainwindow.h"
#include "ui_mainwindow.h"

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

    ui->mainWidget->setMouseTracking(true);
    QTimer *delay = new QTimer(this);
    connect(delay, &QTimer::timeout, this, [this](){init();});
    delay->setSingleShot(true);     // 只触发一次
    delay->start(10);   // 让构造函数执行完后再进行初始化
}

void MainWindow::init() {
    QPainterPath path;
    path.addRoundedRect(ui->mainWidget->rect(), cornerRadius - 1, cornerRadius - 1);
    QRegion mask(path.toFillPolygon().toPolygon());
    ui->mainWidget->setMask(mask);

    QString mainStyle;
    ui->mainWidget->setObjectName("mainWidget");
    mainStyle = "QWidget#mainWidget{background-color:" + mainBackGround.name() + QString::asprintf(";border-radius:%dpx", cornerRadius) + "}";
    ui->mainWidget->setStyleSheet(mainStyle);

    windowShadow = new QGraphicsDropShadowEffect(this);
    windowShadow->setBlurRadius(30);
    windowShadow->setColor(QColor(0, 0, 0));
    windowShadow->setOffset(0, 0);
    ui->mainWidget->setGraphicsEffect(windowShadow);

    border = new QWidget(this);
    border->move(ui->mainWidget->pos() - QPoint(1, 1));
    border->resize(ui->mainWidget->size() + QSize(2, 2));
    QString borderStyle = "background-color:#00FFFFFF;border:1.5px solid #686868; border-radius:20px";
    border->setStyleSheet(borderStyle);
    border->setAttribute(Qt::WA_TransparentForMouseEvents);
    border->show();


    // 创建用户登录界面
    user_login = new LoginWidget(ui->userWidget);
    user_login->show();

    // 创建用户注册界面(隐藏)
    user_register = new RegisterWidget(ui->userWidget);
    user_register->hide();

    // 创建用户找回密码界面(隐藏)
    user_findpasswd = new FindPasswd(ui->userWidget);
    user_findpasswd->hide();

    // 用户按下登录按钮
    connect(user_login, &LoginWidget::notify_register, this, [this](){
        if (!checkOpen()) return;
        user_login->hide();
        user_register->show();
    });

    // 用户按下忘记密码按钮
    connect(user_login, &LoginWidget::notify_forget, this, [this](){
        if (!checkOpen()) return;
        user_login->hide();
        user_findpasswd->show();
    });

    // 注册用户按下返回按钮
    connect(user_register, &RegisterWidget::notify_back, this, [this](){
        if (!checkOpen()) return;
        user_register->hide();
        user_login->show();
    });

    // 找回用户按下返回按钮
    connect(user_findpasswd, &FindPasswd::notify_back, this, [this](){
        if (!checkOpen()) return;
        user_findpasswd->hide();
        user_login->show();
    });

    // 用户按下登录按钮
    connect(user_login, &LoginWidget::notify_login, this, &MainWindow::deal_with_login);

    // 用户按下注册按钮
    connect(user_register, &RegisterWidget::notify_register, this, &MainWindow::deal_with_register);

    // 用户按下更改密码按钮
    connect(user_findpasswd, &FindPasswd::notify_find, this, &MainWindow::deal_with_findpasswd);
}

// 检查用户网络连接
bool MainWindow::checkOpen() {
    if (!user_login->isOpen() || !user_register->isOpen() || !user_findpasswd->isOpen()) {
        QMessageBox::critical(this, QString::fromLocal8Bit("注意"),
                             QString::fromLocal8Bit("请连接网络!"));
        return false;
    }
    return true;
}

// 处理登录界面返回值
void MainWindow::deal_with_login(LoginWidget::STATE state) {
    if (!checkOpen()) return;
    switch (state) {
    case LoginWidget::LOGIN_YES:
    {
        QMessageBox::information(this, QString::fromLocal8Bit("提示"),
                               QString::fromLocal8Bit("登录成功!"));
        break;
    }
    case LoginWidget::LOGIN_USER:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("用户名不存在!"));
        break;
    }
    case LoginWidget::LOGIN_PASS:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("密码错误!"));
        break;
    }
    }

    if (state == LoginWidget::LOGIN_YES) {
        // 将用户信息记录到全局数据结构中
        GlobalData::globalInstance()->setUserName(user_login->username);
        GlobalData::globalInstance()->setPassWord(user_login->password);
        this->hide();   // 隐藏当前窗口
        user->show();   // 显示主窗口
    }
}

// 处理注册界面返回值
void MainWindow::deal_with_register(RegisterWidget::STATE state) {
    if (!checkOpen()) return;
    switch (state) {
    case RegisterWidget::REGISTER_YES:
    {
        QMessageBox::information(this, QString::fromLocal8Bit("提示"),
                               QString::fromLocal8Bit("注册成功!"));
        user_register->hide();
        user_login->show();
        break;
    }
    case RegisterWidget::REGISTER_CODE:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("验证码错误!"));
        break;
    }
    case RegisterWidget::REGISTER_PASS_DIFF:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("密码不一致!"));
        break;
    }
    case RegisterWidget::REGISTER_PASS_SHORT:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("密码过短!"));
        break;
    }
    case RegisterWidget::REGISTER_USER:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("用户名已存在!"));
        break;
    }
    case RegisterWidget::REGISTER_EMPTY:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("用户名不能为空!"));
        break;
    }
    case RegisterWidget::REGISTER_EMAIL_ERROR:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("邮箱格式错误!"));
        break;
    }
    case RegisterWidget::REGISTER_EMAIL_SEND:
    {
        QMessageBox::information(this, QString::fromLocal8Bit("提示"),
                               QString::fromLocal8Bit("验证码已发送!"));
        break;
    }
    case RegisterWidget::REGISTER_FORMAT:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("用户名格式错误(只含大小写字母)!"));
        break;
    }
    }
}

// 处理找回密码界面返回值
void MainWindow::deal_with_findpasswd(FindPasswd::STATE state) {
    if (!checkOpen()) return;
    switch (state) {
    case FindPasswd::FIND_YES:
    {
        QMessageBox::information(this, QString::fromLocal8Bit("提示"),
                               QString::fromLocal8Bit("密码更改成功!"));
        user_findpasswd->hide();
        user_login->show();
        break;
    }
    case FindPasswd::FIND_CODE:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("验证码错误!"));
        break;
    }
    case FindPasswd::FIND_USER:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("用户名不存在!"));
        break;
    }
    case FindPasswd::FIND_EMAIL_SEND:
    {
        QMessageBox::information(this, QString::fromLocal8Bit("提示"),
                               QString::fromLocal8Bit("验证码已发送!"));
        break;
    }
    case FindPasswd::FIND_EMAIL_ERROR:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("邮箱格式错误!"));
        break;
    }
    case FindPasswd::FIND_EMPTY:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("用户名不能为空!"));
        break;
    }
    case FindPasswd::FIND_PASS_DIFF:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("密码不一致!"));
        break;
    }
    case FindPasswd::FIND_PASS_SHORT:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("密码过短!"));
        break;
    }
    case FindPasswd::FIND_FORMAT:
    {
        QMessageBox::warning(this, QString::fromLocal8Bit("警告"),
                             QString::fromLocal8Bit("用户名格式错误(只含大小写字母)!"));
        break;
    }
    }
}

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


void MainWindow::controlWindowScale(){
    if(!maximized){
        lastGeometry = this->frameGeometry();
        windowShadow->setEnabled(false);
        ui->verticalLayout->setContentsMargins(0, 0, 0, 0);
        border->hide();
        QString mainStyle = "QWidget#mainWidget{background-color:" + mainBackGround.name() + ";border-radius:0px;}";
        ui->mainWidget->setStyleSheet(mainStyle);
        this->showMaximized();
        maximized = true;
        QPainterPath path;
        path.addRect(ui->mainWidget->rect());
        QRegion mask(path.toFillPolygon().toPolygon());
        ui->mainWidget->setMask(mask);
    }
    else{
        ui->verticalLayout->setContentsMargins(30, 30, 30, 30);
        this->showNormal();
        QString mainStyle = "QWidget#mainWidget{background-color:" + mainBackGround.name() + QString::asprintf(";border-radius:%dpx", cornerRadius) + "}";
        ui->mainWidget->setStyleSheet(mainStyle);
        QPainterPath path;
        path.addRoundedRect(ui->mainWidget->rect(), cornerRadius - 1, cornerRadius - 1);
        QRegion mask(path.toFillPolygon().toPolygon());
        ui->mainWidget->setMask(mask);
        border->show();
        windowShadow->setEnabled(true);
        this->resize(lastGeometry.width(), lastGeometry.height());
        this->move(lastGeometry.x(), lastGeometry.y());
        maximized = false;
    }
}

void MainWindow::mousePressEvent(QMouseEvent *event) {
    if (event->button() == Qt::LeftButton) {
        mousePressed = true;
        lastPos = event->globalPos() - this->frameGeometry().topLeft();
    }
}

void MainWindow::mouseMoveEvent(QMouseEvent *event) {
    if(event->buttons() == Qt::NoButton)
        mousePressed = false;
    if(!mousePressed){
        mouseState = 0;
        if(!maximized && abs(event->pos().x() - ui->mainWidget->pos().x()) < 5)
            mouseState |= AT_LEFT;
        if(!maximized && abs(event->pos().y() - ui->mainWidget->pos().y()) < 5)
            mouseState |= AT_TOP;
        if(!maximized && abs(event->pos().x() - ui->mainWidget->pos().x() - ui->mainWidget->width()) < 5)
            mouseState |= AT_RIGHT;
        if(!maximized && abs(event->pos().y() - ui->mainWidget->pos().y() - ui->mainWidget->height()) < 5)
            mouseState |= AT_BOTTOM;
        if(mouseState == AT_TOP_LEFT  || mouseState == AT_BOTTOM_RIGHT)
            setCursor(Qt::SizeFDiagCursor);
        else if(mouseState == AT_TOP_RIGHT || mouseState == AT_BOTTOM_LEFT)
            setCursor(Qt::SizeBDiagCursor);
        else if(mouseState & (AT_LEFT | AT_RIGHT))
            setCursor(Qt::SizeHorCursor);
        else if(mouseState & (AT_TOP | AT_BOTTOM))
            setCursor(Qt::SizeVerCursor);
        else
            unsetCursor();
    }
    else{
        if(mouseState == 0){
            if(maximized){
                qreal wRatio = (double)event->pos().x() / (double)ui->mainWidget->width();
                controlWindowScale();
                this->move(QPoint(event->globalPos().x() - ui->mainWidget->width() * wRatio, -30));
                lastPos = QPoint(ui->mainWidget->width() * wRatio, event->pos().y());
            }
            else
                this->move(event->globalPos() - lastPos);
        }
        else{
            QPoint d = event->globalPos() - frameGeometry().topLeft() - lastPos;
            if(mouseState & AT_LEFT){
                this->move(this->frameGeometry().x() + d.x(), this->frameGeometry().y());
                this->resize(this->width() - d.x(), this->height());
            }
            if(mouseState & AT_RIGHT){
                this->resize(this->width() + d.x(), this->height());
            }
            if(mouseState & AT_TOP){
                this->move(this->frameGeometry().x(), this->frameGeometry().y() + d.y());
                this->resize(this->width(), this->height() - d.y());
            }
            if(mouseState & AT_BOTTOM){
                this->resize(this->width(), this->height() + d.y());
            }
        }
        lastPos = event->globalPos() - this->frameGeometry().topLeft();
    }
}


void MainWindow::mouseReleaseEvent(QMouseEvent *event) {
    Q_UNUSED(event);
    mousePressed = false;
}