#include "mainwidget.h"
#include "./ui_mainwidget.h"
#include <QHBoxLayout>
#include <QVBoxLayout>

#include "sessionfriendarea.h"

MainWidget *MainWidget::instance = nullptr;

MainWidget *MainWidget::getInstance()
{
    if(instance == nullptr) {
        //此处不传入参数，以桌面为父窗口
        //
        instance = new MainWidget();
    }
    return instance;
}

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

    // this->setStyleSheet("MainWidget {min-height: 6000px; }");
    this->resize(QSize(1280, 800));

    this->setWindowTitle("MyChat");
    this->setWindowIcon(QIcon(":/resource/image/logo.png"));

    //初始化主窗口的样式布局
    initMainWindow();
    //初始化左侧窗口的样式布局
    initLeftWindow();
    //初始化中间窗口的样式布局
    initMidWindow();
    //初始化右侧窗口的样式布局
    initRightWindow();
    //初始化信号槽
    initSignalSlot();

}

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

void MainWidget::initMainWindow()
{
    QHBoxLayout* layout = new QHBoxLayout();
    //layout内部的元素间隔设置为0
    layout->setSpacing(0);
    //layout内部元素四个方向边界的距离设置
    layout->setContentsMargins(0, 0, 0, 0);
    this->setLayout(layout);

    windowLeft = new QWidget();
    windowMid = new QWidget();
    windowRight = new QWidget();


    windowLeft->setFixedWidth(70);
    windowMid->setFixedWidth(320);
    windowRight->setMinimumWidth(900);

    windowLeft->setStyleSheet("QWidget { background-color: rgb(46, 46, 46); }");
    windowMid->setStyleSheet("QWidget { background-color: rgb(247, 247, 247); }");
    windowRight->setStyleSheet("QWidget { background-color: rgb(245, 245, 245); }");

    layout->addWidget(windowLeft);
    layout->addWidget(windowMid);
    layout->addWidget(windowRight);
}

void MainWidget::initLeftWindow()
{
    QVBoxLayout* layout = new QVBoxLayout();

    layout->setSpacing(20);
    layout->setContentsMargins(0, 50, 0, 0);

    windowLeft->setLayout(layout);

    //添加用户头像
    userAvatar = new QPushButton();
    userAvatar->setFixedSize(45, 45);
    userAvatar->setIconSize(QSize(45, 45));
    userAvatar->setIcon(QIcon(":/resource/image/defaultAv.png"));
    userAvatar->setStyleSheet("QPushButton {background-color: transparent; }");
    layout->addWidget(userAvatar, 1, Qt::AlignTop | Qt::AlignCenter);

    //添加会话标签页按钮
    sessionTabBtn = new QPushButton();
    sessionTabBtn->setFixedSize(45, 45);
    sessionTabBtn->setIconSize(QSize(35, 35));
    sessionTabBtn->setIcon(QIcon(":/resource/image/session_active.png"));
    sessionTabBtn->setStyleSheet("QPushButton {background-color: transparent; }");
    layout->addWidget(sessionTabBtn, 1, Qt::AlignTop | Qt::AlignCenter);

    //添加好友标签页按钮
    friendTabBtn = new QPushButton();
    friendTabBtn->setFixedSize(45, 45);
    friendTabBtn->setIconSize(QSize(35, 35));
    friendTabBtn->setIcon(QIcon(":/resource/image/friend_inactive.png"));
    friendTabBtn->setStyleSheet("QPushButton {background-color: transparent; }");
    layout->addWidget(friendTabBtn, 1, Qt::AlignTop | Qt::AlignCenter);

    //添加好友申请标签页按钮
    applyTabBtn = new QPushButton();
    applyTabBtn->setFixedSize(45, 45);
    applyTabBtn->setIconSize(QSize(35, 35));
    applyTabBtn->setIcon(QIcon(":/resource/image/apply_inactive.png"));
    applyTabBtn->setStyleSheet("QPushButton {background-color: transparent; }");
    layout->addWidget(applyTabBtn, 1, Qt::AlignTop | Qt::AlignCenter);

    layout->addStretch(20);

}
void MainWidget::initMidWindow()
{
    QGridLayout* layout = new QGridLayout();
    //距离上方有20px，另外的三个方向都不要边距
    layout->setContentsMargins(0, 20, 0, 0);
    layout->setSpacing(0);
    windowMid->setLayout(layout);

    searchEdit = new QLineEdit();
    searchEdit->setFixedHeight(30);
    searchEdit->setPlaceholderText("搜索");
    searchEdit->setStyleSheet("QLineEdit { border-radius: 5px; background-color: rgb(226, 226, 226); padding-left: 5px; }");

    addFriendBtn = new QPushButton();
    addFriendBtn->setFixedSize(30, 30);
    addFriendBtn->setIcon(QIcon(":/resource/image/cross.png"));
    QString style = R"(QPushButton { border-radius: 5px; background-color: rgb(226, 226, 226); }
                        QPushButton::pressed { background-color: rgb(240, 240, 240); })";
    addFriendBtn->setStyleSheet(style);

    SessionFriendArea* sessionFriendArea = new SessionFriendArea();

    //为了更加灵活的控制边距，只影响搜索框和按钮的这一行，
    //创建空白的widget填充到布局管理器上
    QWidget* spacer1 = new QWidget();
    spacer1->setFixedWidth(10);
    QWidget* spacer2 = new QWidget();
    spacer2->setFixedWidth(10);
    QWidget* spacer3 = new QWidget();
    spacer3->setFixedWidth(10);

    QWidget* spacer4 = new QWidget();
    spacer4->setFixedHeight(10);

    layout->addWidget(spacer1, 0, 0);
    layout->addWidget(searchEdit, 0, 1);
    layout->addWidget(spacer2, 0, 2);
    layout->addWidget(addFriendBtn, 0 ,3);
    layout->addWidget(spacer3, 0, 4);

    layout->addWidget(spacer4, 1, 0, 1, 5);
    layout->addWidget(sessionFriendArea, 2, 0, 1, 5);
}

void MainWidget::initRightWindow()
{
    //创建右侧窗口的布局管理器
    QVBoxLayout* vlayout = new QVBoxLayout();
    vlayout->setSpacing(0);
    vlayout->setContentsMargins(0, 0, 0, 0);
    vlayout->setAlignment(Qt::AlignTop);
    windowRight->setLayout(vlayout);

    //创建上方的标题栏
    QWidget* titleWidget = new QWidget();
    titleWidget->setFixedHeight(62);
    titleWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
    titleWidget->setObjectName("titleWidget");
    titleWidget->setStyleSheet(R"(#titleWidget  { border-bottom: 2px solid rgb(231, 231, 231);
                                            border-left: 1px solid rgb(231, 231, 231); }
    )");
    vlayout->addWidget(titleWidget);

    //给标题栏添加 label 和 button
    QHBoxLayout* hlayout = new QHBoxLayout();
    hlayout->setSpacing(0);
    hlayout->setContentsMargins(10, 0, 10, 0);
    titleWidget->setLayout(hlayout);

    QLabel* sessionTitleLabel = new QLabel();
    sessionTitleLabel->setStyleSheet("QLabel { font-size: 22px; border-bottom: 1px solid rgb(230, 230, 230); }");

#if TEST_UI
    //为了测试仅填充从服务器获取的数据
    sessionTitleLabel->setText("TEST TITLE");
#endif

    hlayout->addWidget(sessionTitleLabel);

    QPushButton* extraBtn = new QPushButton();
    extraBtn->setFixedSize(30, 30);
    extraBtn->setIconSize(QSize(30, 30));
    extraBtn->setIcon(QIcon(":/resource/image/more.png"));
    extraBtn->setStyleSheet(R"(QPushButton { border: none; background-color: transparent; }
                                QPushButton:pressed { background-color: rgb(210, 210 ,210); }
    )");
    hlayout->addWidget(extraBtn);


    //添加消息展示区
    messageShowArea = new MessageShowArea();
    vlayout->addWidget(messageShowArea);

    //添加消息编辑区
    messageEditArea = new MessageEditArea();
    //确保消息编辑区处于窗口正下方
    vlayout->addWidget(messageEditArea, 0, Qt::AlignBottom);
}

void MainWidget::initSignalSlot()
{
    /////////////////////////////////////
    //连接信号槽，处理标签页切换
    /////////////////////////////////////
    connect(sessionTabBtn, &QPushButton::clicked, this, &MainWidget::switchTabToSession);
    connect(friendTabBtn, &QPushButton::clicked, this, &MainWidget::switchTabToFriend);
    connect(applyTabBtn, &QPushButton::clicked, this, &MainWidget::switchTabToApply);


    /////////////////////////////////////
    // 点击自己的头像，弹出对话框显示个人的主页
    /////////////////////////////////////
    connect(userAvatar, &QPushButton::clicked, this, [=]()->void {
        SelfInfoWidget* selfInfoWidget = new SelfInfoWidget(this);
        selfInfoWidget->setStyleSheet("QDialog { background-color: rgb(255, 255, 255); }");
        selfInfoWidget->exec(); //弹出模态对话框
        //selfInfoWidget->show(); //弹出非模态对加框
        });
}

void MainWidget::switchTabToSession()
{
    //记录当前切换到了哪个标签页
    activeTab = SESSION_LIST;
    //调整图标显示情况
    sessionTabBtn->setIcon(QIcon(":/resource/image/session_active.png"));
    friendTabBtn->setIcon(QIcon(":/resource/image/friend_inactive.png"));
    applyTabBtn->setIcon(QIcon(":/resource/image/apply_inactive.png"));
    // 在主窗口的中间部分，加载出会话列表数据
    this->loadSessionList();
}

void MainWidget::switchTabToFriend()
{
    //记录当前切换到了哪个标签页
    activeTab = FRIEND_LIST;
    //调整图标显示情况
    sessionTabBtn->setIcon(QIcon(":/resource/image/session_inactive.png"));
    friendTabBtn->setIcon(QIcon(":/resource/image/friend_active.png"));
    applyTabBtn->setIcon(QIcon(":/resource/image/apply_inactive.png"));
    // 在主窗口的中间部分，加载出会话列表数据
    this->loadFriendList();
}

void MainWidget::switchTabToApply()
{
    //记录当前切换到了哪个标签页
    activeTab = APPLY_LIST;
    //调整图标显示情况
    sessionTabBtn->setIcon(QIcon(":/resource/image/session_inactive.png"));
    friendTabBtn->setIcon(QIcon(":/resource/image/friend_inactive.png"));
    applyTabBtn->setIcon(QIcon(":/resource/image/apply_active.png"));
    // 在主窗口的中间部分，加载出会话列表数据
    this->loadApplyList();
}

//加载会话列表
void MainWidget::loadSessionList()
{
    //TODO
}

//加载好友列表
void MainWidget::loadFriendList()
{
    //TODO
}

//加载申请列表
void MainWidget::loadApplyList()
{
    //TODO
}