/*
	This file is part of Warzone 2100.
	Copyright (C) 1999-2004  Eidos Interactive
	Copyright (C) 2005-2020  Warzone 2100 Project

	Warzone 2100 is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	Warzone 2100 is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with Warzone 2100; if not, write to the Free Software
	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*! \file input.h
 * \brief Prototypes for the keyboard and mouse input functions.
 */
#ifndef _input_h
#define _input_h

/* Check the header files have been included from frame.h if they
 * are used outside of the framework library.
 */
#if !defined(_frame_h) && !defined(FRAME_LIB_INCLUDE)
#error Framework header files MUST be included from Frame.h ONLY.
#endif

#include "types.h"
#include "lib/framework/utf.h"
#include "vector.h"
#include <vector>


/** Defines for all the key codes used. */
enum KEY_CODE
{
	KEY_ESC         = 27,
	KEY_1           = '1',
	KEY_2           = '2',
	KEY_3           = '3',
	KEY_4           = '4',
	KEY_5           = '5',
	KEY_6           = '6',
	KEY_7           = '7',
	KEY_8           = '8',
	KEY_9           = '9',
	KEY_0           = '0',
	KEY_MINUS       = '-',
	KEY_EQUALS      = '=',
	KEY_BACKSPACE   = '\b',
	KEY_TAB         = '\t',
	KEY_Q           = 'q',
	KEY_W           = 'w',
	KEY_E           = 'e',
	KEY_R           = 'r',
	KEY_T           = 't',
	KEY_Y           = 'y',
	KEY_U           = 'u',
	KEY_I           = 'i',
	KEY_O           = 'o',
	KEY_P           = 'p',
	KEY_LBRACE      = '[',
	KEY_RBRACE      = ']',
	KEY_RETURN      = '\r',  // Comes from SDL, don't know why not '\n'.
	KEY_LCTRL       = 306,
	KEY_A           = 'a',
	KEY_S           = 's',
	KEY_D           = 'd',
	KEY_F           = 'f',
	KEY_G           = 'g',
	KEY_H           = 'h',
	KEY_J           = 'j',
	KEY_K           = 'k',
	KEY_L           = 'l',
	KEY_SEMICOLON   = ';',
	KEY_QUOTE       = '\'',
	KEY_BACKQUOTE   = '`',
	KEY_LSHIFT      = 304,
	KEY_LMETA       = 310,  // TODO Added after Qt branched.
	KEY_LSUPER      = 311,  // TODO Added after Qt branched.
	KEY_BACKSLASH   = '\\',
	KEY_Z           = 'z',
	KEY_X           = 'x',
	KEY_C           = 'c',
	KEY_V           = 'v',
	KEY_B           = 'b',
	KEY_N           = 'n',
	KEY_M           = 'm',
	KEY_COMMA       = ',',
	KEY_FULLSTOP    = '.',
	KEY_FORWARDSLASH = '/',
	KEY_RSHIFT      = 303,
	KEY_RMETA       = 309,  // TODO Added after Qt branched.
	KEY_RSUPER      = 312,  // TODO Added after Qt branched.
	KEY_KP_STAR     = 268,
	KEY_LALT        = 308,
	KEY_SPACE       = ' ',
	KEY_CAPSLOCK    = 301,
	KEY_F1          = 282,
	KEY_F2          = 283,
	KEY_F3          = 284,
	KEY_F4          = 285,
	KEY_F5          = 286,
	KEY_F6          = 287,
	KEY_F7          = 288,
	KEY_F8          = 289,
	KEY_F9          = 290,
	KEY_F10         = 291,
	KEY_NUMLOCK     = 300,
	KEY_SCROLLLOCK  = 302,
	KEY_KP_7        = 263,
	KEY_KP_8        = 264,
	KEY_KP_9        = 265,
	KEY_KP_MINUS    = 269,
	KEY_KP_4        = 260,
	KEY_KP_5        = 261,
	KEY_KP_6        = 262,
	KEY_KP_PLUS     = 270,
	KEY_KP_1        = 257,
	KEY_KP_2        = 258,
	KEY_KP_3        = 259,
	KEY_KP_0        = 256,
	KEY_KP_FULLSTOP = 266,
	KEY_F11         = 292,
	KEY_F12         = 293,
	KEY_RCTRL       = 305,
	KEY_KP_BACKSLASH = 267, ///< Most keypads just have a forward slash.
	KEY_RALT        = 307,
	KEY_HOME        = 278,
	KEY_UPARROW     = 273,
	KEY_PAGEUP      = 280,
	KEY_LEFTARROW   = 276,
	KEY_RIGHTARROW  = 275,
	KEY_END         = 279,
	KEY_DOWNARROW   = 274,
	KEY_PAGEDOWN    = 281,
	KEY_INSERT      = 277,
	KEY_DELETE      = 127,
	KEY_KPENTER     = 271,

	KEY_MAXSCAN     = 323,  ///< The largest possible scan code.

	KEY_IGNORE      = 5190
};
enum MOUSE_KEY_CODE
{
	MOUSE_LMB = 1,
	MOUSE_MMB,
	MOUSE_RMB,
	MOUSE_X1,	// mouse button 4
	MOUSE_X2,	// mouse button 5
	MOUSE_WUP,
	MOUSE_WDN,
	MOUSE_END	// end of our enum
};

struct MousePress
{
	enum Action {None, Press, Release};

	MousePress(Action action = None, MOUSE_KEY_CODE key = MOUSE_END) : action(action), key(key), pos(0,0) {}
	bool empty() const
	{
		return action == None;
	}

	Action action;
	MOUSE_KEY_CODE key;
	Vector2i pos;
};
typedef std::vector<MousePress> MousePresses;

/** Tell the input system that we have lost the focus. */
void inputLoseFocus();
void StopTextInput();
/** Converts the key code into an ascii string. */
WZ_DECL_NONNULL(2) void keyScanToString(KEY_CODE code, char *ascii, UDWORD maxStringSize);
WZ_DECL_NONNULL(2) void mouseKeyCodeToString(const MOUSE_KEY_CODE code, char *ascii, const int maxStringLength);

void inputRestoreMetaKeyState();

/** Initialise the input module. */
void inputInitialise();

/** This returns true if the key is currently depressed. */
bool keyDown(KEY_CODE code);

/** This returns true if the key went from being up to being down this frame. */
bool keyPressed(KEY_CODE code);

/** This returns true if the key went from being down to being up this frame. */
bool keyReleased(KEY_CODE code);

/** Return the current X position of the mouse. */
uint16_t mouseX() WZ_DECL_PURE;

/** Return the current Y position of the mouse. */
uint16_t mouseY() WZ_DECL_PURE;

Vector2i const& getMouseWheelSpeed();

/// Returns true iff the mouse is on the window.
bool wzMouseInWindow();

/// Return the position of the mouse where it was clicked last.
Vector2i mousePressPos_DEPRECATED(MOUSE_KEY_CODE code) WZ_DECL_PURE;

/// Return the position of the mouse where it was released last.
Vector2i mouseReleasePos_DEPRECATED(MOUSE_KEY_CODE code) WZ_DECL_PURE;

/** This returns true if the mouse key is currently depressed. */
bool mouseDown(MOUSE_KEY_CODE code);

/** This returns true if the mouse key was double clicked. */
bool mouseDClicked(MOUSE_KEY_CODE code);

/** This returns true if the mouse key went from being up to being down this frame. */
bool mousePressed(MOUSE_KEY_CODE code);

/** This returns true if the mouse key went from being down to being up this frame. */
bool mouseReleased(MOUSE_KEY_CODE code);

/** Check for a mouse drag, return the drag start coords if dragging. */
WZ_DECL_NONNULL(2, 3) bool mouseDrag(MOUSE_KEY_CODE code, UDWORD *px, UDWORD *py);

void setMouseWarp(bool value);
bool getMouseWarp();

/* The input buffer can contain normal character codes and these control codes */
#define INPBUF_LEFT		KEY_LEFTARROW
#define INPBUF_RIGHT		KEY_RIGHTARROW
#define INPBUF_UP		KEY_UPARROW
#define INPBUF_DOWN		KEY_DOWNARROW
#define INPBUF_HOME		KEY_HOME
#define INPBUF_END		KEY_END
#define INPBUF_INS		KEY_INSERT
#define INPBUF_DEL		KEY_DELETE
#define INPBUF_PGUP		KEY_PAGEUP
#define INPBUF_PGDN		KEY_PAGEDOWN

/* Some defines for keys that map into the normal character space */
#define INPBUF_BKSPACE	KEY_BACKSPACE
#define INPBUF_TAB		KEY_TAB
#define INPBUF_CR		KEY_RETURN
#define INPBUF_ESC		KEY_ESC

/** Return the next key press or 0 if no key in the buffer.
 * The key returned will have been remapped to the correct ascii code for the
 * US layout (approximately) key map.
 * All key presses are buffered up (including auto repeat).
 * @param unicode is filled (unless NULL) with the unicode character corresponding
 * to the key press (using the user's native layout).
 */
UDWORD inputGetKey(utf_32_char *unicode);

/// Returns all clicks/releases since last update.
MousePresses const &inputGetClicks();

/** Clear the input buffer. */
void inputClearBuffer();

/* This is called once a frame so that the system can tell
 * whether a key was pressed this turn or held down from the last frame.
 */
void inputNewFrame();

static inline bool specialOrderKeyDown()
{
	return keyDown(KEY_LALT) || keyDown(KEY_RALT) || keyDown(KEY_LMETA) || keyDown(KEY_RMETA) || keyDown(KEY_LSUPER) || keyDown(KEY_RSUPER);
}

#endif // _input_h