/* PDCurses */

#if defined(__EMX__) || defined(__WATCOMC__) || defined(__IBMC__) || \
defined(__TURBOC__)
# define HAVE_SIGNAL
# include <signal.h>
#endif

#include "pdcos2.h"

/*man-start**************************************************************

pdckbd
------

### Synopsis

    unsigned long PDC_get_input_fd(void);

### Description

   PDC_get_input_fd() returns the file descriptor that PDCurses reads
   its input from. It can be used for select().

### Portability
                             X/Open  ncurses  NetBSD
    PDC_get_input_fd            -       -       -

**man-end****************************************************************/

static KBDINFO kbdinfo;     /* default keyboard mode */
static HMOU mouse_handle = 0;
static MOUSE_STATUS old_mouse_status;
static USHORT old_shift = 0;
static bool key_pressed = FALSE;
static int mouse_events = 0;

/************************************************************************
 *    Table for key code translation of function keys in keypad mode    *
 *    These values are for strict IBM keyboard compatibles only         *
 ************************************************************************/

static short key_table[] =
{
    -1,             ALT_ESC,        -1,             0,
    -1,             -1,             -1,             -1,
    -1,             -1,             -1,             -1,
    -1,             -1,             ALT_BKSP,       KEY_BTAB,
    ALT_Q,          ALT_W,          ALT_E,          ALT_R,
    ALT_T,          ALT_Y,          ALT_U,          ALT_I,
    ALT_O,          ALT_P,          ALT_LBRACKET,   ALT_RBRACKET,
    ALT_ENTER,      -1,             ALT_A,          ALT_S,
    ALT_D,          ALT_F,          ALT_G,          ALT_H,
    ALT_J,          ALT_K,          ALT_L,          ALT_SEMICOLON,
    ALT_FQUOTE,     ALT_BQUOTE,     -1,             ALT_BSLASH,
    ALT_Z,          ALT_X,          ALT_C,          ALT_V,
    ALT_B,          ALT_N,          ALT_M,          ALT_COMMA,
    ALT_STOP,       ALT_FSLASH,     -1,             ALT_PADSTAR,
    -1,             -1,             -1,             KEY_F(1),
    KEY_F(2),       KEY_F(3),       KEY_F(4),       KEY_F(5),
    KEY_F(6),       KEY_F(7),       KEY_F(8),       KEY_F(9),
    KEY_F(10),      -1,             -1,             KEY_HOME,
    KEY_UP,         KEY_PPAGE,      ALT_PADMINUS,   KEY_LEFT,
    KEY_B2,         KEY_RIGHT,      ALT_PADPLUS,    KEY_END,
    KEY_DOWN,       KEY_NPAGE,      KEY_IC,         KEY_DC,
    KEY_F(13),      KEY_F(14),      KEY_F(15),      KEY_F(16),
    KEY_F(17),      KEY_F(18),      KEY_F(19),      KEY_F(20),
    KEY_F(21),      KEY_F(22),      KEY_F(25),      KEY_F(26),
    KEY_F(27),      KEY_F(28),      KEY_F(29),      KEY_F(30),
    KEY_F(31),      KEY_F(32),      KEY_F(33),      KEY_F(34),
    KEY_F(37),      KEY_F(38),      KEY_F(39),      KEY_F(40),
    KEY_F(41),      KEY_F(42),      KEY_F(43),      KEY_F(44),
    KEY_F(45),      KEY_F(46),      -1,             CTL_LEFT,
    CTL_RIGHT,      CTL_END,        CTL_PGDN,       CTL_HOME,
    ALT_1,          ALT_2,          ALT_3,          ALT_4,
    ALT_5,          ALT_6,          ALT_7,          ALT_8,
    ALT_9,          ALT_0,          ALT_MINUS,      ALT_EQUAL,
    CTL_PGUP,       KEY_F(11),      KEY_F(12),      KEY_F(23),
    KEY_F(24),      KEY_F(35),      KEY_F(36),      KEY_F(47),
    KEY_F(48),      CTL_UP,         CTL_PADMINUS,   CTL_PADCENTER,
    CTL_PADPLUS,    CTL_DOWN,       CTL_INS,        CTL_DEL,
    CTL_TAB,        CTL_PADSLASH,   CTL_PADSTAR,    ALT_HOME,
    ALT_UP,         ALT_PGUP,       -1,             ALT_LEFT,
    -1,             ALT_RIGHT,      -1,             ALT_END,
    ALT_DOWN,       ALT_PGDN,       ALT_INS,        ALT_DEL,
    ALT_PADSLASH,   ALT_TAB,        ALT_PADENTER,   -1
};

unsigned long PDC_get_input_fd(void)
{
    PDC_LOG(("PDC_get_input_fd() - called\n"));

    return (unsigned long)fileno(stdin);
}

void PDC_get_keyboard_info(void)
{
    kbdinfo.cb = sizeof(kbdinfo);
    KbdGetStatus(&kbdinfo, 0);
}

void PDC_set_keyboard_default(void)
{
    KbdSetStatus(&kbdinfo, 0);
}

void PDC_set_keyboard_binary(bool on)
{
    PDC_LOG(("PDC_set_keyboard_binary() - called\n"));

    if (on)
    {
        kbdinfo.fsMask &= ~(KEYBOARD_ASCII_MODE);
        kbdinfo.fsMask |= KEYBOARD_BINARY_MODE;
    }
    else
    {
        kbdinfo.fsMask &= ~(KEYBOARD_BINARY_MODE);
        kbdinfo.fsMask |= KEYBOARD_ASCII_MODE;
    }

    KbdSetStatus(&kbdinfo, 0);

#ifdef HAVE_SIGNAL
    signal(SIGBREAK, on ? SIG_IGN : SIG_DFL);
#endif
}

/* check if a key or mouse event is waiting */

bool PDC_check_key(void)
{
    KBDKEYINFO keyInfo = {0};

    KbdGetStatus(&kbdinfo, 0);

    if (mouse_handle)
    {
        MOUQUEINFO queue;

        MouGetNumQueEl(&queue, mouse_handle);
        mouse_events = queue.cEvents;

        if (mouse_events)
            return TRUE;
    }

    if (old_shift && !kbdinfo.fsState)  /* modifier released */
    {
        if (!key_pressed && SP->return_key_modifiers)
            return TRUE;
    }
    else if (!old_shift && kbdinfo.fsState) /* modifier pressed */
        key_pressed = FALSE;

    old_shift = kbdinfo.fsState;

    KbdPeek(&keyInfo, 0);   /* peek at keyboard  */
    return (keyInfo.fbStatus != 0);
}

static int _process_mouse_events(void)
{
    MOUEVENTINFO event;
    static const USHORT button_mask[] = {6, 96, 24},
                        move_mask[] = {2, 32, 8},
                        press_mask[] = {4, 64, 16};
    USHORT count = 1;
    short shift_flags = 0;
    int i;

    MouReadEventQue(&event, &count, mouse_handle);
    mouse_events--;

    for (i = 0; i < 3; i++)
    {
        SP->mouse_status.button[i] =
            ((event.fs & move_mask[i]) ? BUTTON_MOVED : 0) |
            ((event.fs & press_mask[i]) ? BUTTON_PRESSED : 0);

        /* PRESS events are sometimes mistakenly reported as MOVE
           events. A MOVE should always follow a PRESS, so treat a MOVE
           immediately after a RELEASE as a PRESS. */

        if ((SP->mouse_status.button[i] == BUTTON_MOVED) &&
            (old_mouse_status.button[i] == BUTTON_RELEASED))
        {
            SP->mouse_status.button[i] = BUTTON_PRESSED;
        }

        if (SP->mouse_status.button[i] == BUTTON_PRESSED && SP->mouse_wait)
        {
            /* Check for a click -- a PRESS followed immediately by a
               release */

            if (!mouse_events)
            {
                MOUQUEINFO queue;

                napms(SP->mouse_wait);

                MouGetNumQueEl(&queue, mouse_handle);
                mouse_events = queue.cEvents;
            }

            if (mouse_events)
            {
                MouReadEventQue(&event, &count, mouse_handle);

                if (!(event.fs & button_mask[i]))
                    SP->mouse_status.button[i] = BUTTON_CLICKED;
            }
        }
    }

    SP->mouse_status.x = event.col;
    SP->mouse_status.y = event.row;

    SP->mouse_status.changes = 0;

    for (i = 0; i < 3; i++)
    {
        if (old_mouse_status.button[i] != SP->mouse_status.button[i])
            SP->mouse_status.changes |= (1 << i);

        if (SP->mouse_status.button[i] == BUTTON_MOVED)
        {
            /* Discard non-moved "moves" */

            if (SP->mouse_status.x == old_mouse_status.x &&
                SP->mouse_status.y == old_mouse_status.y)
                return -1;

            /* Motion events always flag the button as changed */

            SP->mouse_status.changes |= (1 << i);
            SP->mouse_status.changes |= PDC_MOUSE_MOVED;
            break;
        }
    }

    old_mouse_status = SP->mouse_status;

    /* Treat click events as release events for comparison purposes */

    for (i = 0; i < 3; i++)
    {
        if (old_mouse_status.button[i] == BUTTON_CLICKED)
            old_mouse_status.button[i] = BUTTON_RELEASED;
    }

    /* Check for SHIFT/CONTROL/ALT */

    if (kbdinfo.fsState & KBDSTF_ALT)
        shift_flags |= BUTTON_ALT;

    if (kbdinfo.fsState & KBDSTF_CONTROL)
        shift_flags |= BUTTON_CONTROL;

    if (kbdinfo.fsState & (KBDSTF_LEFTSHIFT|KBDSTF_RIGHTSHIFT))
        shift_flags |= BUTTON_SHIFT;

    if (shift_flags)
    {
        for (i = 0; i < 3; i++)
        {
            if (SP->mouse_status.changes & (1 << i))
                SP->mouse_status.button[i] |= shift_flags;
        }
    }

    old_shift = kbdinfo.fsState;
    key_pressed = TRUE;

    SP->key_code = TRUE;
    return KEY_MOUSE;
}

/* return the next available key or mouse event */

int PDC_get_key(void)
{
    int key, scan;
    KBDKEYINFO keyInfo = {0};

    SP->key_modifiers = 0L;

    if (mouse_handle && mouse_events)
        return _process_mouse_events();

    if (old_shift && !kbdinfo.fsState)
    {
        key = -1;

        if (old_shift & KBDSTF_LEFTALT)
        {
            key = KEY_ALT_L;
        }
        else if (old_shift & KBDSTF_RIGHTALT)
        {
            key = KEY_ALT_R;
        }
        else if (old_shift & KBDSTF_LEFTCONTROL)
        {
            key = KEY_CONTROL_L;
        }
        else if (old_shift & KBDSTF_RIGHTCONTROL)
        {
            key = KEY_CONTROL_R;
        }
        else if (old_shift & KBDSTF_LEFTSHIFT)
        {
            key = KEY_SHIFT_L;
        }
        else if (old_shift & KBDSTF_RIGHTSHIFT)
        {
            key = KEY_SHIFT_R;
        }

        key_pressed = FALSE;
        old_shift = kbdinfo.fsState;

        SP->key_code = TRUE;
        return key;
    }

    KbdCharIn(&keyInfo, IO_WAIT, 0);    /* get a character */

    key = keyInfo.chChar;
    scan = keyInfo.chScan;

    if (keyInfo.fsState & KBDSTF_ALT)
        SP->key_modifiers |= PDC_KEY_MODIFIER_ALT;

    if (keyInfo.fsState & KBDSTF_CONTROL)
        SP->key_modifiers |= PDC_KEY_MODIFIER_CONTROL;

    if (keyInfo.fsState & KBDSTF_NUMLOCK_ON)
        SP->key_modifiers |= PDC_KEY_MODIFIER_NUMLOCK;

    if (keyInfo.fsState & (KBDSTF_LEFTSHIFT|KBDSTF_RIGHTSHIFT))
        SP->key_modifiers |= PDC_KEY_MODIFIER_SHIFT;

    if (scan == 0x1c && key == 0x0a)    /* ^Enter */
        key = CTL_ENTER;
    else if (scan == 0xe0 && key == 0x0d)   /* PadEnter */
        key = PADENTER;
    else if (scan == 0xe0 && key == 0x0a)   /* ^PadEnter */
        key = CTL_PADENTER;
    else if (scan == 0x37 && key == 0x2a)   /* Star */
        key = PADSTAR;
    else if (scan == 0x4a && key == 0x2d)   /* Minus */
        key = PADMINUS;
    else if (scan == 0x4e && key == 0x2b)   /* Plus */
        key = PADPLUS;
    else if (scan == 0xe0 && key == 0x2f)   /* Slash */
        key = PADSLASH;
    else if (key == 0x00 || (key == 0xe0 && scan > 53 && scan != 86))
        key = (scan > 0xa7) ? -1 : key_table[scan];

    if (keyInfo.fsState & (KBDSTF_LEFTSHIFT|KBDSTF_RIGHTSHIFT))
    {
        switch (key)
        {
        case KEY_HOME:  /* Shift Home */
            key = KEY_SHOME;
            break;
        case KEY_UP:    /* Shift Up */
            key = KEY_SUP;
            break;
        case KEY_PPAGE: /* Shift PgUp */
            key = KEY_SPREVIOUS;
            break;
        case KEY_LEFT:  /* Shift Left */
            key = KEY_SLEFT;
            break;
        case KEY_RIGHT: /* Shift Right */
            key = KEY_SRIGHT;
            break;
        case KEY_END:   /* Shift End */
            key = KEY_SEND;
            break;
        case KEY_DOWN:  /* Shift Down */
            key = KEY_SDOWN;
            break;
        case KEY_NPAGE: /* Shift PgDn */
            key = KEY_SNEXT;
            break;
        case KEY_IC:    /* Shift Ins */
            key = KEY_SIC;
            break;
        case KEY_DC:    /* Shift Del */
            key = KEY_SDC;
        }
    }

    key_pressed = TRUE;
    SP->key_code = ((unsigned)key >= 256);

    return key;
}

/* discard any pending keyboard or mouse input -- this is the core
   routine for flushinp() */

void PDC_flushinp(void)
{
    PDC_LOG(("PDC_flushinp() - called\n"));

    if (mouse_handle)
        MouFlushQue(mouse_handle);

    KbdFlushBuffer(0);
}

bool PDC_has_mouse(void)
{
    if (!mouse_handle)
    {
        memset(&old_mouse_status, 0, sizeof(MOUSE_STATUS));
        MouOpen(NULL, &mouse_handle);
    }

    return !!mouse_handle;
}

int PDC_mouse_set(void)
{
    unsigned long mbe = SP->_trap_mbe;

    if (mbe && !mouse_handle)
    {
        if (PDC_has_mouse())
            MouDrawPtr(mouse_handle);
    }
    else if (!mbe && mouse_handle)
    {
        MouClose(mouse_handle);
        mouse_handle = 0;
    }

    if (mbe && mouse_handle)
    {
        USHORT mask = ((mbe & (BUTTON1_PRESSED | BUTTON1_CLICKED |
                               BUTTON1_MOVED)) ? 6 : 0) |

                      ((mbe & (BUTTON3_PRESSED | BUTTON3_CLICKED |
                               BUTTON3_MOVED)) ? 24 : 0) |

                      ((mbe & (BUTTON2_PRESSED | BUTTON2_CLICKED |
                               BUTTON2_MOVED)) ? 96 : 0);

        MouSetEventMask(&mask, mouse_handle);
    }

    return OK;
}

int PDC_modifiers_set(void)
{
    key_pressed = FALSE;

    return OK;
}
