#include "logview.h"
#include "ui_logview.h"
#include "qad_types.h"
#include "ecombobox.h"
#include <QTextDocument>
#include <QAbstractTextDocumentLayout>
#include <QTextEdit>
#include <QTextBlock>
#include <QScrollBar>
#include <QPixmap>
#include <QEvent>


LogView::Category::Category() {
	bold = false;
}


void LogView::Category::makeIcon(QSize size, QSize size_icon) {
	icon_image = QImage();
	if (!image.isNull())
		icon_image = image.scaled(size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
	QPixmap px = QPixmap::fromImage(image.scaled(size_icon, Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
	icon.addPixmap(px, QIcon::Active);
	icon.addPixmap(px, QIcon::Disabled);
	icon.addPixmap(px, QIcon::Normal);
	icon.addPixmap(px, QIcon::Selected);
}


LogView::LogView(QWidget * parent): QWidget(parent) {
	ui = new Ui::LogView();
	ui->setupUi(this);
	ui->textEdit->setContextMenuPolicy(Qt::ActionsContextMenu);
	actionLogSelectAll = new QAction(QIcon(":/icons/select-all.png"), tr("Select All"));
	actionLogCopy      = new QAction(QIcon(":/icons/edit-copy.png"), tr("Copy"));
	actionLogClear     = new QAction(QIcon(":/icons/edit-clear.png"), tr("Clear"));
	connect(actionLogSelectAll, SIGNAL(triggered(bool)), ui->textEdit, SLOT(selectAll()));
	connect(actionLogCopy, SIGNAL(triggered(bool)), ui->textEdit, SLOT(copy()));
	connect(actionLogClear, SIGNAL(triggered(bool)), ui->textEdit, SLOT(clear()));
	ui->textEdit->addAction(actionLogSelectAll);
	ui->textEdit->addAction(actionLogCopy);
	ui->textEdit->addAction(actionLogClear);
	ui->buttonClear->setDefaultAction(ui->actionClear);
	ui->labelIconSearch->setFixedSize(preferredIconSize(1.2, this));
	ui->comboCategory->addItem(tr("All"));
	ui->textEdit->document()->setUndoRedoEnabled(false);
	setLinesLimit(10000);
	QTextCursor tc(ui->textEdit->document());
	def_cf = tc.charFormat();
}


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


const QTextEdit * LogView::textEdit() const {
	return ui->textEdit;
}


void LogView::setLogFont(QFont f) {
	ui->textEdit->document()->setDefaultFont(f);
	QTextCursor tc(ui->textEdit->document());
	def_cf = tc.charFormat();
}


QFont LogView::logFont() const {
	return ui->textEdit->document()->defaultFont();
}


bool LogView::isFilterVisible() const {
	return ui->widgetToolbar->isVisible();
}


int LogView::linesLimit() const {
	return ui->textEdit->document()->maximumBlockCount();
}


void LogView::registerCategory(const QString & label, QString keyword, const QImage & icon, QColor color, bool bold) {
	QRegularExpression regexp(keyword, QRegularExpression::PatternOptions(QRegularExpression::CaseInsensitiveOption));
	registerCategory(label, regexp, icon, color, bold);
}


void LogView::registerCategory(const QString & label, QRegularExpression regexp, const QImage & icon, QColor color, bool bold) {
	if (!regexp.isValid()) return;
	Category c;
	c.regexp = regexp;
	categories.removeAll(c);
	c.label = label;
	c.image = icon;
	c.color = color;
	c.bold = bold;
	c.makeIcon(iconImageSize(), preferredIconSize(1., this));
	categories.append(c);
	ui->comboCategory->addItem(c.icon, label, regexp);
}


void LogView::addText(const QString & text, bool insert_newline) {
	if (text.isEmpty()) return;
	QTextCursor tc(ui->textEdit->document());
	QStringList sl = text.split("\n");
	tc.movePosition(QTextCursor::End);
	QScrollBar * bar = ui->textEdit->verticalScrollBar();
	bool at_end = (bar->value() == bar->maximum());
	for (int i = 0; i < sl.size(); ++i) {
		if (sl[i].isEmpty()) return;
		tc.insertText(sl[i]);
		if ((i < sl.size() - 1) || insert_newline)
			newLine();
	}
	if (at_end)
		bar->setValue(bar->maximum());
	if (ui->widgetToolbar->isVisible())
		filter();
}


void LogView::changeEvent(QEvent * e) {
	QWidget::changeEvent(e);
	switch (e->type()) {
		case QEvent::LanguageChange:
			ui->retranslateUi(this);
			actionLogSelectAll->setText(tr("Select All"));
			actionLogCopy->setText(tr("Copy"));
			actionLogClear->setText(tr("Clear"));
			break;
		case QEvent::Polish: {
			ui->labelIconSearch->setFixedSize(preferredIconSize(1.2, this));
			QSize is = iconImageSize(), is_i = preferredIconSize(1., this);
			QMutableListIterator<Category> it(categories);
			while (it.hasNext())
				it.next().makeIcon(is, is_i);
		} break;
		default:
			break;
	}
}


void LogView::newLine() {
	QTextCursor tc(ui->textEdit->document());
	tc.movePosition(QTextCursor::End);
	tc.movePosition(QTextCursor::StartOfBlock, QTextCursor::KeepAnchor);
	QString line = tc.selectedText();
	QImage icon;
	QListIterator<Category> it(categories);
	while (it.hasNext()) {
		const Category & c(it.next());
		if (line.contains(c.regexp)) {
			QTextCharFormat  cf = def_cf;
			cf.setForeground(c.color);
			if (c.bold)
				cf.setFontWeight(QFont::Bold);
			tc.setCharFormat(cf);
			icon = c.icon_image;
			break;
		}
	}
	if (!icon.isNull()) {
		tc.movePosition(QTextCursor::StartOfBlock, QTextCursor::MoveAnchor);
		tc.insertImage(icon);
	}
	tc.movePosition(QTextCursor::End);
	tc.setCharFormat(def_cf);
	tc.insertBlock();
}


QSize LogView::iconImageSize() {
	int hei = QFontMetrics(ui->textEdit->document()->defaultFont()).height() / 1.25;
	return QSize(hei, hei);
}


void LogView::setFilterVisible(bool yes) {
	ui->widgetToolbar->setHidden(!yes);
}


void LogView::setLinesLimit(int l) {
	ui->textEdit->document()->setMaximumBlockCount(l);
}


void LogView::clear() {
	ui->textEdit->clear();
}


void LogView::filter() {
	QTextDocument * doc = ui->textEdit->document();
	int bc = doc->blockCount();
	QRegularExpression regexp = ui->comboCategory->currentData().toRegularExpression();
	QString fs = ui->lineEdit->text();
	QTextBlock bl;
	for (int i = 0; i < bc; ++i) {
		bl = doc->findBlockByNumber(i);
		bool vis = true;
		if (regexp.isValid()) vis = vis && bl.text().contains(regexp);
		if (!fs.isEmpty()) vis = vis && bl.text().contains(fs[1], Qt::CaseInsensitive);
		bl.setVisible(vis);
	}
	doc->markContentsDirty(0, bl.position() + bl.length());
}