/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2010 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/*
     File added by Alan Buckley (alan_baa@hotmail.com) for RISC OS compatability
	 27 March 2003

     Implements keyboard setup, event pump and keyboard and mouse polling
*/


#include "../../timer/SDL_timer_c.h"
#include "../../events/SDL_sysevents.h"
#include "../../events/SDL_events_c.h"
#include "../SDL_cursor_c.h"
#include "SDL_riscosvideo.h"
#include "SDL_riscosevents_c.h"

#include "memory.h"
#include "stdlib.h"
#include "ctype.h"

#include "kernel.h"
#include "swis.h"

/* The translation table from a RISC OS internal key numbers to a SDL keysym */
static SDLKey RO_keymap[SDLK_LAST];

/* RISC OS Key codes */
#define ROKEY_SHIFT 0
#define ROKEY_CTRL  1
#define ROKEY_ALT   2
/* Left shift is first key we will check for */
#define ROKEY_LEFT_SHIFT 3

/* Need to ignore mouse buttons as they are processed separately */
#define ROKEY_LEFT_MOUSE   9
#define ROKEY_CENTRE_MOUSE 10
#define ROKEY_RIGHT_MOUSE  11

/* No key has been pressed return value*/
#define ROKEY_NONE 255

/* Id of last key in keyboard */
#define ROKEY_LAST_KEY  124

/* Size of array for all keys */
#define ROKEYBD_ARRAYSIZE 125

static char RO_pressed[ROKEYBD_ARRAYSIZE];

static SDL_keysym *TranslateKey(int intkey, SDL_keysym * keysym, int pressed);

void RISCOS_PollMouse(_THIS);
void RISCOS_PollKeyboard();

void RISCOS_PollMouseHelper(_THIS, int fullscreen);

#if SDL_THREADS_DISABLED
extern void DRenderer_FillBuffers();

/* Timer running function */
extern void RISCOS_CheckTimer();

#endif

void
FULLSCREEN_PumpEvents(_THIS)
{
    /* Current implementation requires keyboard and mouse polling */
    RISCOS_PollKeyboard();
    RISCOS_PollMouse(this);
#if SDL_THREADS_DISABLED
//      DRenderer_FillBuffers();
    if (SDL_timer_running)
        RISCOS_CheckTimer();
#endif
}


void
RISCOS_InitOSKeymap(_THIS)
{
    int i;

    /* Map the VK keysyms */
    for (i = 0; i < SDL_arraysize(RO_keymap); ++i)
        RO_keymap[i] = SDLK_UNKNOWN;

    RO_keymap[3] = SDLK_LSHIFT;
    RO_keymap[4] = SDLK_LCTRL;
    RO_keymap[5] = SDLK_LALT;
    RO_keymap[6] = SDLK_RSHIFT;
    RO_keymap[7] = SDLK_RCTRL;
    RO_keymap[8] = SDLK_RALT;
    RO_keymap[16] = SDLK_q;
    RO_keymap[17] = SDLK_3;
    RO_keymap[18] = SDLK_4;
    RO_keymap[19] = SDLK_5;
    RO_keymap[20] = SDLK_F4;
    RO_keymap[21] = SDLK_8;
    RO_keymap[22] = SDLK_F7;
    RO_keymap[23] = SDLK_MINUS, RO_keymap[25] = SDLK_LEFT;
    RO_keymap[26] = SDLK_KP6;
    RO_keymap[27] = SDLK_KP7;
    RO_keymap[28] = SDLK_F11;
    RO_keymap[29] = SDLK_F12;
    RO_keymap[30] = SDLK_F10;
    RO_keymap[31] = SDLK_SCROLLOCK;
    RO_keymap[32] = SDLK_PRINT;
    RO_keymap[33] = SDLK_w;
    RO_keymap[34] = SDLK_e;
    RO_keymap[35] = SDLK_t;
    RO_keymap[36] = SDLK_7;
    RO_keymap[37] = SDLK_i;
    RO_keymap[38] = SDLK_9;
    RO_keymap[39] = SDLK_0;
    RO_keymap[41] = SDLK_DOWN;
    RO_keymap[42] = SDLK_KP8;
    RO_keymap[43] = SDLK_KP9;
    RO_keymap[44] = SDLK_BREAK;
    RO_keymap[45] = SDLK_BACKQUOTE;
/*  RO_keymap[46] = SDLK_currency; TODO: Figure out if this has a value */
    RO_keymap[47] = SDLK_BACKSPACE;
    RO_keymap[48] = SDLK_1;
    RO_keymap[49] = SDLK_2;
    RO_keymap[50] = SDLK_d;
    RO_keymap[51] = SDLK_r;
    RO_keymap[52] = SDLK_6;
    RO_keymap[53] = SDLK_u;
    RO_keymap[54] = SDLK_o;
    RO_keymap[55] = SDLK_p;
    RO_keymap[56] = SDLK_LEFTBRACKET;
    RO_keymap[57] = SDLK_UP;
    RO_keymap[58] = SDLK_KP_PLUS;
    RO_keymap[59] = SDLK_KP_MINUS;
    RO_keymap[60] = SDLK_KP_ENTER;
    RO_keymap[61] = SDLK_INSERT;
    RO_keymap[62] = SDLK_HOME;
    RO_keymap[63] = SDLK_PAGEUP;
    RO_keymap[64] = SDLK_CAPSLOCK;
    RO_keymap[65] = SDLK_a;
    RO_keymap[66] = SDLK_x;
    RO_keymap[67] = SDLK_f;
    RO_keymap[68] = SDLK_y;
    RO_keymap[69] = SDLK_j;
    RO_keymap[70] = SDLK_k;
    RO_keymap[72] = SDLK_SEMICOLON;
    RO_keymap[73] = SDLK_RETURN;
    RO_keymap[74] = SDLK_KP_DIVIDE;
    RO_keymap[76] = SDLK_KP_PERIOD;
    RO_keymap[77] = SDLK_NUMLOCK;
    RO_keymap[78] = SDLK_PAGEDOWN;
    RO_keymap[79] = SDLK_QUOTE;
    RO_keymap[81] = SDLK_s;
    RO_keymap[82] = SDLK_c;
    RO_keymap[83] = SDLK_g;
    RO_keymap[84] = SDLK_h;
    RO_keymap[85] = SDLK_n;
    RO_keymap[86] = SDLK_l;
    RO_keymap[87] = SDLK_SEMICOLON;
    RO_keymap[88] = SDLK_RIGHTBRACKET;
    RO_keymap[89] = SDLK_DELETE;
    RO_keymap[90] = SDLK_KP_MINUS;
    RO_keymap[91] = SDLK_KP_MULTIPLY;
    RO_keymap[93] = SDLK_EQUALS;
    RO_keymap[94] = SDLK_BACKSLASH;
    RO_keymap[96] = SDLK_TAB;
    RO_keymap[97] = SDLK_z;
    RO_keymap[98] = SDLK_SPACE;
    RO_keymap[99] = SDLK_v;
    RO_keymap[100] = SDLK_b;
    RO_keymap[101] = SDLK_m;
    RO_keymap[102] = SDLK_COMMA;
    RO_keymap[103] = SDLK_PERIOD;
    RO_keymap[104] = SDLK_SLASH;
    RO_keymap[105] = SDLK_END;
    RO_keymap[106] = SDLK_KP0;
    RO_keymap[107] = SDLK_KP1;
    RO_keymap[108] = SDLK_KP3;
    RO_keymap[112] = SDLK_ESCAPE;
    RO_keymap[113] = SDLK_F1;
    RO_keymap[114] = SDLK_F2;
    RO_keymap[115] = SDLK_F3;
    RO_keymap[116] = SDLK_F5;
    RO_keymap[117] = SDLK_F6;
    RO_keymap[118] = SDLK_F8;
    RO_keymap[119] = SDLK_F9;
    RO_keymap[120] = SDLK_HASH;
    RO_keymap[121] = SDLK_RIGHT;
    RO_keymap[122] = SDLK_KP4;
    RO_keymap[123] = SDLK_KP5;
    RO_keymap[124] = SDLK_KP2;

    SDL_memset(RO_pressed, 0, ROKEYBD_ARRAYSIZE);
}


/* Variable for mouse relative processing */
int mouse_relative = 0;

/* Check to see if we need to enter or leave mouse relative mode */

void
RISCOS_CheckMouseMode(_THIS)
{
    /* If the mouse is hidden and input is grabbed, we use relative mode */
    if (!(SDL_cursorstate & CURSOR_VISIBLE) &&
        (this->input_grab != SDL_GRAB_OFF)) {
        mouse_relative = 1;
    } else {
        mouse_relative = 0;
    }
}


void
RISCOS_PollMouse(_THIS)
{
    RISCOS_PollMouseHelper(this, 1);
}

extern int mouseInWindow;

void
WIMP_PollMouse(_THIS)
{
    /* Only poll when mouse is over the window */
    if (!mouseInWindow)
        return;

    RISCOS_PollMouseHelper(this, 0);
}

/* Static variables so only changes are reported */
static Sint16 last_x = -1, last_y = -1;
static int last_buttons = 0;

/* Share routine between WIMP and FULLSCREEN for polling mouse and
   passing on events */
void
RISCOS_PollMouseHelper(_THIS, int fullscreen)
{
    _kernel_swi_regs regs;
    static int starting = 1;

    if (_kernel_swi(OS_Mouse, &regs, &regs) == NULL) {
        Sint16 new_x = regs.r[0];       /* Initialy get as OS units */
        Sint16 new_y = regs.r[1];

        /* Discard mouse events until they let go of the mouse after starting */
        if (starting && regs.r[2] != 0)
            return;
        else
            starting = 0;

        if (new_x != last_x || new_y != last_y || last_buttons != regs.r[2]) {
            /* Something changed so generate appropriate events */
            int topLeftX, topLeftY;     /* Top left OS units */
            int x, y;           /* Mouse position in SDL pixels */

            if (fullscreen) {
                topLeftX = 0;
                topLeftY = (this->hidden->height << this->hidden->yeig) - 1;
            } else {
                int window_state[9];

                /* Get current window state */
                window_state[0] = this->hidden->window_handle;
                regs.r[1] = (unsigned int) window_state;
                _kernel_swi(Wimp_GetWindowState, &regs, &regs);

                topLeftX = window_state[1];
                topLeftY = window_state[4];
            }

            /* Convert co-ordinates to workspace */
            x = new_x - topLeftX;
            y = topLeftY - new_y;       /* Y goes from top of window/screen */

            /* Convert OS units to pixels */
            x >>= this->hidden->xeig;
            y >>= this->hidden->yeig;

            if (last_x != new_x || last_y != new_y) {
                if (mouse_relative) {
                    int centre_x = SDL_VideoSurface->w / 2;
                    int centre_y = SDL_VideoSurface->h / 2;

                    if (centre_x != x || centre_y != y) {
                        if (SDL_VideoSurface)
                            SDL_PrivateMouseMotion(0, 1,
                                                   x - centre_x,
                                                   y - centre_y);
                        last_x = topLeftX + (centre_x << this->hidden->xeig);
                        last_y = topLeftY - (centre_y << this->hidden->yeig);

                        /* Re-centre the mouse pointer, so we still get relative
                           movement when the mouse is at the edge of the window
                           or screen.
                         */
                        {
                            unsigned char block[5];

                            block[0] = 3;       /* OSWORD move pointer sub-reason code */
                            block[1] = last_x & 0xFF;
                            block[2] = (last_x >> 8) & 0xFF;
                            block[3] = last_y & 0xFF;
                            block[4] = (last_y >> 8) & 0xFF;

                            regs.r[0] = 21;     /* OSWORD pointer stuff code */
                            regs.r[1] = (int) block;
                            _kernel_swi(OS_Word, &regs, &regs);
                        }
                    }
                } else {
                    last_x = new_x;
                    last_y = new_y;
                    SDL_PrivateMouseMotion(0, 0, x, y);
                }
            }

            if (last_buttons != regs.r[2]) {
                int changed = last_buttons ^ regs.r[2];
                last_buttons = regs.r[2];
                if (changed & 4)
                    SDL_PrivateMouseButton((last_buttons & 4) ?
                                           SDL_PRESSED : SDL_RELEASED,
                                           SDL_BUTTON_LEFT, 0, 0);
                if (changed & 2)
                    SDL_PrivateMouseButton((last_buttons & 2) ?
                                           SDL_PRESSED : SDL_RELEASED,
                                           SDL_BUTTON_MIDDLE, 0, 0);
                if (changed & 1)
                    SDL_PrivateMouseButton((last_buttons & 1) ?
                                           SDL_PRESSED : SDL_RELEASED,
                                           SDL_BUTTON_RIGHT, 0, 0);
            }
        }
    }
}

void
RISCOS_PollKeyboard()
{
    int which_key = ROKEY_LEFT_SHIFT;
    int j;
    int min_key, max_key;
    SDL_keysym key;

    /* Scan the keyboard to see what is pressed */
    while (which_key <= ROKEY_LAST_KEY) {
        which_key = (_kernel_osbyte(121, which_key, 0) & 0xFF);
        if (which_key != ROKEY_NONE) {
            switch (which_key) {
                /* Skip over mouse keys */
            case ROKEY_LEFT_MOUSE:
            case ROKEY_CENTRE_MOUSE:
            case ROKEY_RIGHT_MOUSE:
                which_key = ROKEY_RIGHT_MOUSE;
                break;

                /* Ignore keys that cause 2 internal number to be generated */
            case 71:
            case 24:
            case 87:
            case 40:
                break;

                /* Ignore break as it can be latched on */
            case 44:
                break;

            default:
                RO_pressed[which_key] += 2;
                break;
            }
            which_key++;
        }
    }

    /* Generate key released messages */
    min_key = ROKEY_LAST_KEY + 1;
    max_key = ROKEY_LEFT_SHIFT;

    for (j = ROKEY_LEFT_SHIFT; j <= ROKEY_LAST_KEY; j++) {
        if (RO_pressed[j]) {
            if (RO_pressed[j] == 1) {
                RO_pressed[j] = 0;
                SDL_PrivateKeyboard(SDL_RELEASED, TranslateKey(j, &key, 0));
            } else {
                if (j < min_key)
                    min_key = j;
                if (j > max_key)
                    max_key = j;
            }
        }
    }

    /* Generate key pressed messages */
    for (j = min_key; j <= max_key; j++) {
        if (RO_pressed[j]) {
            if (RO_pressed[j] == 2) {
                SDL_PrivateKeyboard(SDL_PRESSED, TranslateKey(j, &key, 1));
            }
            RO_pressed[j] = 1;
        }
    }
}

static SDL_keysym *
TranslateKey(int intkey, SDL_keysym * keysym, int pressed)
{
    /* Set the keysym information */
    keysym->scancode = (unsigned char) intkey;
    keysym->sym = RO_keymap[intkey];
    keysym->mod = KMOD_NONE;
    keysym->unicode = 0;
    if (pressed && SDL_TranslateUNICODE) {
        int state;
        int ch;

        state = (_kernel_osbyte(202, 0, 255) & 0xFF);

        /*TODO: Take into account other keyboard layouts */

        ch = keysym->sym;       /* This should handle most unshifted keys */

        if (intkey < 9 || ch == SDLK_UNKNOWN) {
            ch = 0;

        } else if (state & 64) {        /* Control on */
            ch = ch & 31;

        } else {
            int topOfKey = 0;
            if (state & 8) {    /* Shift on */
                topOfKey = 1;
            }

            if ((state & 16) == 0) {    /* Caps lock is on */
                if (ch >= SDLK_a && ch <= SDLK_z) {
                    if ((state & 128) == 0) {   /* Shift Enable off */
                        /* All letter become upper case */
                        topOfKey = 1;
                    } else {
                        /* Shift+Letters gives lower case */
                        topOfKey = 1 - topOfKey;
                    }
                }
            }

            if (topOfKey) {
                /* Key produced with shift held down */

                /* Letters just give upper case version */
                if (ch >= SDLK_a && ch <= SDLK_z)
                    ch = toupper(ch);
                else {
                    switch (ch) {
                    case SDLK_HASH:
                        ch = '~';
                        break;
                    case SDLK_QUOTE:
                        ch = '@';
                        break;
                    case SDLK_COMMA:
                        ch = '<';
                        break;
                    case SDLK_MINUS:
                        ch = '_';
                        break;
                    case SDLK_PERIOD:
                        ch = '>';
                        break;
                    case SDLK_SLASH:
                        ch = '?';
                        break;

                    case SDLK_0:
                        ch = ')';
                        break;
                    case SDLK_1:
                        ch = '!';
                        break;
                    case SDLK_2:
                        ch = '"';
                        break;
                    case SDLK_3:
                        ch = '£';
                        break;
                    case SDLK_4:
                        ch = '$';
                        break;
                    case SDLK_5:
                        ch = '%';
                        break;
                    case SDLK_6:
                        ch = '^';
                        break;
                    case SDLK_7:
                        ch = '&';
                        break;
                    case SDLK_8:
                        ch = '*';
                        break;
                    case SDLK_9:
                        ch = '(';
                        break;

                    case SDLK_SEMICOLON:
                        ch = ':';
                        break;
                    case SDLK_EQUALS:
                        ch = '+';
                        break;
                    case SDLK_LEFTBRACKET:
                        ch = '{';
                        break;
                    case SDLK_BACKSLASH:
                        ch = '|';
                        break;
                    case SDLK_RIGHTBRACKET:
                        ch = '}';
                        break;
                    case SDLK_BACKQUOTE:
                        ch = '¬';
                        break;

                    default:
                        ch = 0; /* Map to zero character if we don't understand it */
                        break;
                    }
                }

            } else if (ch > 126) {
                /* SDL key code < 126 map directly onto their Unicode equivalents */
                /* Keypad 0 to 9 maps to numeric equivalent */
                if (ch >= SDLK_KP0 && ch <= SDLK_KP9)
                    ch = ch - SDLK_KP0 + '0';
                else {
                    /* Following switch maps other keys that produce an Ascii value */
                    switch (ch) {
                    case SDLK_KP_PERIOD:
                        ch = '.';
                        break;
                    case SDLK_KP_DIVIDE:
                        ch = '/';
                        break;
                    case SDLK_KP_MULTIPLY:
                        ch = '*';
                        break;
                    case SDLK_KP_MINUS:
                        ch = '-';
                        break;
                    case SDLK_KP_PLUS:
                        ch = '+';
                        break;
                    case SDLK_KP_EQUALS:
                        ch = '=';
                        break;

                    default:
                        /* If we don't know what it is set the Unicode to 0 */
                        ch = 0;
                        break;
                    }
                }
            }
        }

        keysym->unicode = ch;
    }
    return (keysym);
}

/* end of SDL_riscosevents.c ... */
/* vi: set ts=4 sw=4 expandtab: */