#include "examquestionpage.h"

#include "appevent.h"

#include "qjsonobject.h"
#include "qpainter.h"
#include "tmodel.h"
#include "widgets/examsmodel.h"
#include "widgets/pagination.h"

#include <QCheckBox>
#include <QComboBox>
#include <QDialog>
#include <QFileDialog>
#include <QHeaderView>
#include <QLabel>
#include <QLineEdit>
#include <QStatusBar>
#include <QStyledItemDelegate>
#include <QTableView>

#include <QJsonArray>

#include <layoutbuilder.h>

#include "cwf/sqlquery.h"
#include <cwf/constants.h>
#include <cwf/cppwebapplication.h>
#include <cwf/filter.h>
#include <cwf/sqldatabasestorage.h>

#include "teachertr.h"

static CWF::SqlDatabaseStorage storage("QSQLITE", "localhost", "data.db", "", "");

class CheckDelegate : public QStyledItemDelegate
{
public:
    CheckDelegate(QObject *parent = nullptr)
        : QStyledItemDelegate(parent)
    {}

    void paint(QPainter *painter,
               const QStyleOptionViewItem &option,
               const QModelIndex &index) const override
    {
        QStyledItemDelegate::paint(painter, option, index);

        // 获取数据
        QString tagText = index.data(Qt::DisplayRole).toString();

        QColor color = Qt::lightGray;
        if (tagText == "1" || tagText == "true") {
            tagText = TeacherServer::Tr::tr("Select");
            color = Qt::green;
        } else {
            tagText = TeacherServer::Tr::tr("Not Selected");
        }
        // 设置背景色和边框
        painter->save();
        painter->setRenderHint(QPainter::Antialiasing);
        painter->setPen(Qt::NoPen);
        painter->setBrush(color);                                           // 背景色
        painter->drawRoundedRect(option.rect.adjusted(2, 2, -2, -2), 5, 5); // 圆角矩形

        // 设置文本颜色和对齐方式
        painter->setPen(QColor("#0078D4")); // 文本颜色
        painter->setFont(QFont("Arial", 10));
        painter->drawText(option.rect.adjusted(5, 2, -5, -2), Qt::AlignCenter, tagText);

        painter->restore();
    }

    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override
    {
        // 返回标签的合适大小
        QString tagText = index.data(Qt::DisplayRole).toString();
        QFontMetrics fm(option.font);
        QSize size = fm.size(0, tagText);
        return size + QSize(10, 4); // 调整大小，以适应内容
    }
};
ExamsQuestionPage::ExamsQuestionPage(QWidget *parent)
    : QWidget{parent}
{
    examsLineEdit = new QLineEdit;
    examsView = new QTableView;
    pagination = new Pagination;

    examsNameLineEdit = new QLineEdit;
    fileDirLineEdit = new QLineEdit;
    selectCheckBox = new QCheckBox;
    selectCheckBox->setDisabled(true);

    pageSize = new QComboBox;

    pageSize->addItem("10", 10);
    pageSize->addItem("20", 20);
    pageSize->addItem("30", 30);
    pageSize->addItem("50", 50);
    pageSize->addItem("100", 100);
    using namespace Layouting;

    auto examsEditor = Group{title(tr("Test question information")),
                             Form{
                                 tr("exams name"),
                                 examsNameLineEdit,
                                 br,
                                 tr("file dir"),
                                 fileDirLineEdit,
                                 PushButton{text(tr("open dir")), onClicked([this]() { getDir(); })},
                                 PushButton{text(tr("open file")),
                                            onClicked([this]() { getFile(); })},
                                 br,
                                 tr("select"),
                                 selectCheckBox,
                             },
                             normalMargin}
                           .emerge();

    auto op = Column{PushButton{text(tr("Add")), onClicked([this]() { addExamsQuestion(); })},
                     PushButton{text(tr("Remove")), onClicked([this]() { removeExamsQuestion(); })},
                     PushButton{text(tr("Set as Default")), onClicked([this]() { setDefault(); })},
                     st,
                     PushButton{text(tr("Save")), onClicked([this]() { save(); })}}
                  .emerge();
    // examsEditor->setMinimumWidth(300);
    op->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);
    // Form{"examsPath:", examsLineEdit, PushButton{text(tr("path"))}},}
    auto pageWidget = Row{pagination, st, tr("pageSize"), pageSize, st};

    Row{Column{examsView, pageWidget, examsEditor}, op}.attachTo(this);

    // 考试系统
    // 创建数据模型
    ExamsTableModel *examsTableModel = new ExamsTableModel;
    // 创建表格视图
    examsView->setModel(examsTableModel);
    examsView->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
    examsView->setSelectionBehavior(QAbstractItemView::SelectRows);
    examsView->setSelectionMode(QAbstractItemView::SingleSelection);
    examsView->setItemDelegateForColumn(2, new CheckDelegate(this)); // 设置第0列应用委托
    // 连接信号和槽
    QObject::connect(pageSize, &QComboBox::currentTextChanged, [this](const QString &) {
        updateExamsView();
    });
    QObject::connect(pagination, &Pagination::valueChanged, [this](int) { updateExamsView(); });
    connect(examsView, &QTableView::clicked, this, [=](const QModelIndex &index) {
        ExamsTableModel *model = qobject_cast<ExamsTableModel *>(examsView->model());
        ExamsTableModel::Exams exam = model->getCurrentExam(index);
        examsNameLineEdit->setText(exam.name);
        fileDirLineEdit->setText(exam.fileDir);
        fileDirLineEdit->setToolTip(exam.fileDir);
        selectCheckBox->setChecked(exam.select);
    });

    updateExamsView();
}
void ExamsQuestionPage::updateExamsView()
{
    int size = pageSize->currentData().toInt();
    pagination->setPageSizes(size);

    ExamsQuestionModel examsModel(storage);
    ExamsTableModel *model = qobject_cast<ExamsTableModel *>(examsView->model());

    CWF::SqlQueryManager queryManager(storage);
    queryManager.select("COUNT(*) AS total", examsModel.getTableName());
    queryManager.exec(queryManager.getQueryText());
    QJsonArray array = queryManager.toJson();
    if (!array.isEmpty()) {
        QJsonObject object = array[0].toObject();
        qint64 total = object["total"].toVariant().toLongLong();
        pagination->setTotal(total);
    }
    int pageNumber = pagination->currentPage();
    int pageSize = pagination->pageSizes();

    QString queryStr = QString("SELECT * FROM %1 LIMIT %2 OFFSET %3")
                           .arg(examsModel.getTableName())
                           .arg(pageSize)
                           .arg((pageNumber - 1) * pageSize);
    queryManager.exec(queryStr);
    model->loadJsonData(queryManager.toJson());
}

void ExamsQuestionPage::addExamsQuestion()
{
    ExamsQuestionModel examsModel(storage);
    CWF::SqlQueryManager queryManager(storage);

    queryManager.insert(examsModel.getTableName(), "name,fileDir,isSelect");
    queryManager.prepare();
    queryManager.addBindValue("");
    queryManager.addBindValue("");
    queryManager.addBindValue(false);
    QJsonObject status = queryManager.exec();

    if (status["success"].toBool()) {
        updateExamsView();
    }
}

void ExamsQuestionPage::setDefault()
{
    ExamsTableModel *model = qobject_cast<ExamsTableModel *>(examsView->model());

    const QModelIndex index = examsView->currentIndex();
    ExamsTableModel::Exams exams = model->getCurrentExam(index);
    if (exams.id == 0) {
        return;
    }

    ExamsQuestionModel examsModel(storage);
    CWF::SqlQueryManager queryManager(storage);
    //queryManager.select("*", examsModel.getTableName()).where("isSelect = ?");
    queryManager.update(examsModel.getTableName(),
                        "isSelect =(CASE WHEN id = ? THEN 1 ELSE 0 END );");
    queryManager.prepare();
    queryManager.addBindValue(exams.id);
    QJsonObject status = queryManager.exec();

    if (status["success"].toBool()) {
        updateExamsView();
        examsView->setCurrentIndex(index);

        AppEvent::instance()->examQuestionChenge();
    }
}

void ExamsQuestionPage::removeExamsQuestion()
{
    ExamsTableModel *model = qobject_cast<ExamsTableModel *>(examsView->model());

    const QModelIndex index = examsView->currentIndex();
    ExamsTableModel::Exams exams = model->getCurrentExam(index);
    if (exams.id == 0) {
        return;
    }

    ExamsQuestionModel examsModel(storage);
    CWF::SqlQueryManager queryManager(storage);
    //queryManager.select("*", examsModel.getTableName()).where("isSelect = ?");
    queryManager.remove(examsModel.getTableName(), "id = ?");
    queryManager.prepare();
    queryManager.addBindValue(exams.id);
    QJsonObject status = queryManager.exec();

    if (status["success"].toBool()) {
        updateExamsView();
        examsView->setCurrentIndex(index);
    }
}

void ExamsQuestionPage::save()
{
    ExamsTableModel *model = qobject_cast<ExamsTableModel *>(examsView->model());

    const QModelIndex index = examsView->currentIndex();
    ExamsTableModel::Exams exams = model->getCurrentExam(index);
    if (exams.id == 0) {
        return;
    }

    ExamsQuestionModel examsModel(storage);
    CWF::SqlQueryManager queryManager(storage);
    //queryManager.select("*", examsModel.getTableName()).where("isSelect = ?");
    queryManager.update(examsModel.getTableName(), "name=?,fileDir=?,isSelect=?").where("id = ?");
    queryManager.prepare();
    queryManager.addBindValue(examsNameLineEdit->text());
    queryManager.addBindValue(fileDirLineEdit->text());
    queryManager.addBindValue(selectCheckBox->isChecked());
    queryManager.addBindValue(exams.id);
    QJsonObject status = queryManager.exec();

    if (status["success"].toBool()) {
        updateExamsView();
        examsView->setCurrentIndex(index);
    }
}

void ExamsQuestionPage::getDir()
{
    const QString dir = QFileDialog::getExistingDirectory(this,
                                                          QObject::tr("选择目录"),
                                                          "./",
                                                          QFileDialog::ShowDirsOnly
                                                              | QFileDialog::DontResolveSymlinks);
    fileDirLineEdit->setText(dir);
}

void ExamsQuestionPage::getFile()
{
    const QString file = QFileDialog::getOpenFileName(this,
                                                      QObject::tr("选择文件"),
                                                      "./",
                                                      QObject::tr("所有文件 (*)"));
    fileDirLineEdit->setText(file);
}