#include "SDL.h"

#include "SDL_ttf.h"

#include <map>

#include <vector>

class GlyphCache

{

public:

	SDL_Surface *lookup_glyph(Uint16 ch);

	void put_glyph(Uint16 ch, SDL_Surface *srf);

	void flush();

private:

	std::map<Uint16, SDL_Surface*> _glyph_map;

};

class GlyphRenderer

{

public:

	GlyphRenderer();

	~GlyphRenderer();

	void open_font(const char *fname_regular, const char *fname_bold, int ptsize);

	void close_font();

	// do not free surface returned!

	int get_cell_width() { return _cell_width; };

	int get_cell_height() { return _cell_height; };

private:

	TTF_Font *_font_regular;

	TTF_Font *_font_bold;

	int _cell_width;

	int _cell_height;

	GlyphCache _cache;

};

struct TerminalCell

{

	Uint16 ch;

	Uint16 attr;

	bool operator !=(const TerminalCell &rhs) const { return ch != rhs.ch || attr != rhs.attr; };

};

class TerminalScreen

{

public:

	~TerminalScreen() {};

	void select_font(const char *fname_regular, const char *fname_bold, int ptsize);

	void resize(int pxwidth, int pxheight);

	void erase();

	void putch(int x, int y, Uint16 ch, Uint16 attr);

	void commit();

	int get_width() { return _width; };

	int get_height() { return _height; };

	int get_cell_width() { return _cell_width; };

	int get_cell_height() { return _cell_height; };

private:

	SDL_Surface *_screen_surface;

	std::vector<TerminalCell> _cells_front;

	std::vector<TerminalCell> _cells_back;

	GlyphRenderer _render;

	int _pixel_width;  // terminal window width in pixels

	int _pixel_height;

	int _width;  // width in characters

	int _height; // height in characters

	int _cell_width;  // character cell width in pixels

	int _cell_height;

	void _reset_cells();

};

struct Event

{

	enum { QUIT, RESIZE, KEYPRESS, MOUSEDOWN, MOUSEUP, MOUSEMOVE, MOUSEWHEEL };

	int type;

	union

	{

		struct

		{

			char keyname[10];

			Uint16 unicode;

		} key;

		struct

		{

			int x, y;

			int button;

		} mouse;

	};

};

class Terminal

{

public:

	Terminal();

	~Terminal();

	void select_font(const char *fname_regular, const char *fname_bold, int ptsize)

		{ _screen.select_font(fname_regular, fname_bold, ptsize); };

	void resize(int pxwidth, int pxheight) { _screen.resize(pxwidth, pxheight); };

	void erase() { _screen.erase(); };

	void putch(int x, int y, Uint16 ch) { _screen.putch(x, y, ch, _attr); };

	void commit() { _screen.commit(); };

	void set_attr(Uint16 value) { _attr = value; };

	void set_cursor(int x, int y) { _cursor_x = x; _cursor_y = y; };

	void show_cursor(bool visible) { _cursor_visible = visible; };

	void get_next_event(Event &event);

	int get_width() { return _screen.get_width(); };

	int get_height() { return _screen.get_height(); };

private:

	TerminalScreen _screen;

	Uint16 _attr;

	int _cursor_x;

	int _cursor_y;

	bool _cursor_visible;

	int _mousemove_last_x;

	int _mousemove_last_y;

	const char *_translate_keyname(SDLKey sym);

};