/*
 * Copyright 2013 Jeremie Roy. All rights reserved.
 * License: http://www.opensource.org/licenses/BSD-2-Clause
 */

#ifndef __TEXT_METRICS_H__
#define __TEXT_METRICS_H__

#include "font_manager.h"

class TextMetrics
{
public:
	TextMetrics(FontManager* _fontManager);
	
	/// Append an ASCII/utf-8 string to the metrics helper
	void appendText(FontHandle _fontHandle, const char* _string);

	/// Append a wide char string to the metrics helper
	void appendText(FontHandle _fontHandle, const wchar_t* _string);
		
	/// return the width of the measured text
	float getWidth() const { return m_width; }

	/// return the height of the measured text
	float getHeight() const { return m_height; }

private:
	FontManager* m_fontManager;
	float m_width;
	float m_height;
	float m_x;
	float m_lineHeight;
	float m_lineGap;
};

/// Compute text crop area for text using a single font
class TextLineMetrics
{
public:
	TextLineMetrics(FontManager* _fontManager, FontHandle _fontHandle);
	
	/// Return the height of a line of text using the given font
	float getLineHeight() const { return m_lineHeight; }

	/// Return the number of text line in the given text
	uint32_t getLineCount(const char* _string) const;
	/// Return the number of text line in the given text
	uint32_t getLineCount(const wchar_t* _string) const;
	
	/// Return the first and last character visible in the [_firstLine, _lastLine[ range
	void getSubText(const char* _string, uint32_t _firstLine, uint32_t _lastLine, const char*& _begin, const char*& _end);
	/// Return the first and last character visible in the [_firstLine, _lastLine[ range
	void getSubText(const wchar_t* _string, uint32_t _firstLine, uint32_t _lastLine, const wchar_t*& _begin, const wchar_t*& _end);

	/// Return the first and last character visible in the [_top, _bottom] range,
	void getVisibleText(const char* _string, float _top, float _bottom, const char*& _begin, const char*& _end);
	/// Return the first and last character visible in the [_top, _bottom] range,
	void getVisibleText(const wchar_t* _string, float _top, float _bottom, const wchar_t*& _begin, const wchar_t*& _end);

private:
	FontManager* m_fontManager;
	float m_lineHeight;
};


#endif // __TEXT_METRICS_H__