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#pragma once

#include <QPlainTextEdit>
#include <QObject>

class QPaintEvent;
class QResizeEvent;
class QSize;
class QWidget;

class LineNumberArea;

class CodeEditor
	: public QPlainTextEdit
{
	Q_OBJECT

public:
	CodeEditor(QWidget *parent = 0);

	void lineNumberAreaPaintEvent(QPaintEvent *event);
	int lineNumberAreaWidth();

protected:
	void resizeEvent(QResizeEvent *event);

public slots:
	void runningLine(int lineno);
	void errorLine(QString file, int lineno, QString msg);

private slots:
	void updateLineNumberAreaWidth(int newBlockCount);
	void highlightCurrentLine();
	void updateLineNumberArea(const QRect &, int);

private:
	QWidget *lineNumberArea;
	int lineNumber;
	int errorLineNumber{0};
};

class LineNumberArea
	: public QWidget
{
public:
	LineNumberArea(CodeEditor *editor) : QWidget(editor)
	{
		codeEditor = editor;
	}

	QSize sizeHint() const
	{
		return QSize(codeEditor->lineNumberAreaWidth(), 0);
	}

protected:
	void paintEvent(QPaintEvent *event)
	{
		codeEditor->lineNumberAreaPaintEvent(event);
	}

private:
	CodeEditor *codeEditor;
};