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#include "textfinder.h"
#include <QFile>
#include <QLineEdit>
#include <QMessageBox>
#include <QPushButton>
#include <QTextEdit>
#include <QTextStream>
#include <QUiLoader>
#include <QVBoxLayout>

//! [4]
static QWidget *loadUiFile(QWidget *parent)
{
    QFile file(":/res/forms/textfinder.ui");
    file.open(QIODevice::ReadOnly);

    QUiLoader loader;
    return loader.load(&file, parent);
}

static QString loadTextFile(QString contentPath)
{
    QFile inputFile(contentPath);
    inputFile.open(QIODevice::ReadOnly);
    QTextStream in(&inputFile);
    in.setCodec("UTF-8");
    return in.readAll();
}

TextFinder::TextFinder(QString contentPath, QString titleText, QWidget *parent)
    : QDialog(parent)
{
    QWidget *formWidget = loadUiFile(this);

    ui_findButton = findChild<QPushButton*>("findButton");
    ui_textEdit = findChild<QTextEdit*>("textEdit");
    ui_lineEdit = findChild<QLineEdit*>("lineEdit");

    QMetaObject::connectSlotsByName(this);
    ui_textEdit->setText(loadTextFile(contentPath));

    QFont font = QFont("Microsoft YaHei",10);
    ui_textEdit->setFont(font);

    QVBoxLayout *layout = new QVBoxLayout;
    layout->setMargin(0);
    layout->setContentsMargins(0,0,0,0);
    layout->addWidget(formWidget);
    setLayout(layout);
    setWindowTitle(titleText);


    Qt::WindowFlags flags=Qt::Dialog;
    flags |=Qt::WindowMinMaxButtonsHint;
    flags |=Qt::WindowCloseButtonHint;
    setWindowFlags(flags);

    resize(1520, 890);

    connect(ui_findButton, SIGNAL(clicked()), this, SLOT(OnFindButtonClicked()));
}

bool TextFinder::HighlightKeyWord(QString keyWorld,bool bDefault)
{
    QTextDocument *document = ui_textEdit->document();

    bool found = false;

    // undo previous change (if any)
    document->undo();

    QTextCursor highlightCursor(document);
    QTextCursor cursor(document);

    cursor.beginEditBlock();

    QTextCharFormat plainFormat(highlightCursor.charFormat());
    QTextCharFormat colorFormat = plainFormat;
    colorFormat.setForeground(Qt::red);
    if(bDefault)
        colorFormat.setForeground(Qt::red);
    else
        colorFormat.setForeground(Qt::blue);
    colorFormat.setFontWeight(75);

    while (!highlightCursor.isNull() && !highlightCursor.atEnd()) {
        highlightCursor = document->find(keyWorld, highlightCursor, QTextDocument::FindWholeWords);
        if (!highlightCursor.isNull()) {
            found = true;
            highlightCursor.movePosition(QTextCursor::WordRight,QTextCursor::KeepAnchor);
            highlightCursor.mergeCharFormat(colorFormat);
        }
    }
    cursor.endEditBlock();
    return found;
}

void TextFinder::OnFindButtonClicked()
{
    QString searchString = ui_lineEdit->text();
    if (searchString.isEmpty()) {
        QMessageBox::information(this, QStringLiteral("查找"), QStringLiteral("请输入要查找的关键词 ！ "));
    } else {
        if (!HighlightKeyWord(searchString)) {
            QMessageBox::information(this, QStringLiteral("提示"), QStringLiteral("抱歉！未找到相关关键词！ "));
        }
    }
}