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/*

 * Copyright (c) 2009 Jiri Svoboda

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup kbd

 * @brief US QWERTY leyout.

 * @{

 */

#include <kbd.h>

#include <io/console.h>

#include <io/keycode.h>

#include <bool.h>

#include <layout.h>

static void layout_reset(void);

static wchar_t layout_parse_ev(console_event_t *ev);

enum m_state {

    ms_start,

    ms_hacek,

    ms_carka

};

static enum m_state mstate;

layout_op_t cz_op = {

    layout_reset,

    layout_parse_ev

};

static wchar_t map_lcase[] = {

    [KC_Q] = 'q',

    [KC_W] = 'w',

    [KC_E] = 'e',

    [KC_R] = 'r',

    [KC_T] = 't',

    [KC_Y] = 'z',

    [KC_U] = 'u',

    [KC_I] = 'i',

    [KC_O] = 'o',

    [KC_P] = 'p',

    [KC_A] = 'a',

    [KC_S] = 's',

    [KC_D] = 'd',

    [KC_F] = 'f',

    [KC_G] = 'g',

    [KC_H] = 'h',

    [KC_J] = 'j',

    [KC_K] = 'k',

    [KC_L] = 'l',

    [KC_Z] = 'y',

    [KC_X] = 'x',

    [KC_C] = 'c',

    [KC_V] = 'v',

    [KC_B] = 'b',

    [KC_N] = 'n',

    [KC_M] = 'm',

};

static wchar_t map_ucase[] = {

    [KC_Q] = 'Q',

    [KC_W] = 'W',

    [KC_E] = 'E',

    [KC_R] = 'R',

    [KC_T] = 'T',

    [KC_Y] = 'Z',

    [KC_U] = 'U',

    [KC_I] = 'I',

    [KC_O] = 'O',

    [KC_P] = 'P',

    [KC_A] = 'A',

    [KC_S] = 'S',

    [KC_D] = 'D',

    [KC_F] = 'F',

    [KC_G] = 'G',

    [KC_H] = 'H',

    [KC_J] = 'J',

    [KC_K] = 'K',

    [KC_L] = 'L',

    [KC_Z] = 'Y',

    [KC_X] = 'X',

    [KC_C] = 'C',

    [KC_V] = 'V',

    [KC_B] = 'B',

    [KC_N] = 'N',

    [KC_M] = 'M',

};

static wchar_t map_not_shifted[] = {

    [KC_BACKTICK] = ';',

    [KC_1] = '+',

    [KC_MINUS] = '=',

    [KC_RBRACKET] = ')',

    [KC_QUOTE] = L'§',

    [KC_COMMA] = ',',

    [KC_PERIOD] = '.',

    [KC_SLASH] = '-',

};

static wchar_t map_shifted[] = {

    [KC_1] = '1',

    [KC_2] = '2',

    [KC_3] = '3',

    [KC_4] = '4',

    [KC_5] = '5',

    [KC_6] = '6',

    [KC_7] = '7',

    [KC_8] = '8',

    [KC_9] = '9',

    [KC_0] = '0',

    [KC_MINUS] = '%',

    [KC_LBRACKET] = '/',

    [KC_RBRACKET] = '(',

    [KC_SEMICOLON] = '"',

    [KC_QUOTE] = '!',

    [KC_BACKSLASH] = '\'',

    [KC_COMMA] = '?',

    [KC_PERIOD] = ':',

    [KC_SLASH] = '_',

};

static wchar_t map_ns_nocaps[] = {

    [KC_2] = L'ě',

    [KC_3] = L'š',

    [KC_4] = L'č',

    [KC_5] = L'ř',

    [KC_6] = L'ž',

    [KC_7] = L'ý',

    [KC_8] = L'á',

    [KC_9] = L'í',

    [KC_0] = L'é',

    [KC_LBRACKET] = L'ú',

    [KC_SEMICOLON] = L'ů'

};

static wchar_t map_ns_caps[] = {

    [KC_2] = L'Ě',

    [KC_3] = L'Š',

    [KC_4] = L'Č',

    [KC_5] = L'Ř',

    [KC_6] = L'Ž',

    [KC_7] = L'Ý',

    [KC_8] = L'Á',

    [KC_9] = L'Í',

    [KC_0] = L'É',

    [KC_LBRACKET] = L'Ú',

    [KC_SEMICOLON] = L'Ů'

};

static wchar_t map_neutral[] = {

    [KC_BACKSPACE] = '\b',

    [KC_TAB] = '\t',

    [KC_ENTER] = '\n',

    [KC_SPACE] = ' ',

    [KC_NSLASH] = '/',

    [KC_NTIMES] = '*',

    [KC_NMINUS] = '-',

    [KC_NPLUS] = '+',

    [KC_NENTER] = '\n'

};

static wchar_t map_numeric[] = {

    [KC_N7] = '7',

    [KC_N8] = '8',

    [KC_N9] = '9',

    [KC_N4] = '4',

    [KC_N5] = '5',

    [KC_N6] = '6',

    [KC_N1] = '1',

    [KC_N2] = '2',

    [KC_N3] = '3',

    [KC_N0] = '0',

    [KC_NPERIOD] = '.'

};

static wchar_t map_hacek_lcase[] = {

    [KC_E] = L'ě',

    [KC_R] = L'ř',

    [KC_T] = L'ť',

    [KC_Y] = L'ž',

    [KC_U] = L'ů',

    [KC_S] = L'š',

    [KC_D] = L'ď',

    [KC_C] = L'č',

    [KC_N] = L'ň'

};

static wchar_t map_hacek_ucase[] = {

    [KC_E] = L'Ě',

    [KC_R] = L'Ř',

    [KC_T] = L'Ť',

    [KC_Y] = L'Ž',

    [KC_U] = L'Ů',

    [KC_S] = L'Š',

    [KC_D] = L'Ď',

    [KC_C] = L'Č',

    [KC_N] = L'Ň'

};

static wchar_t map_carka_lcase[] = {

    [KC_E] = L'é',

    [KC_U] = L'ú',

    [KC_I] = L'í',

    [KC_O] = L'ó',

    [KC_A] = L'á',

    [KC_Z] = L'ý',

};

static wchar_t map_carka_ucase[] = {

    [KC_E] = L'É',

    [KC_U] = L'Ú',

    [KC_I] = L'Í',

    [KC_O] = L'Ó',

    [KC_A] = L'Á',

    [KC_Z] = L'Ý',

};

static wchar_t translate(unsigned int key, wchar_t *map, size_t map_length)

{

    if (key >= map_length)

        return 0;

    return map[key];

}

static wchar_t parse_ms_hacek(console_event_t *ev)

{

    wchar_t c;

    mstate = ms_start;

    /* Produce no characters when Ctrl or Alt is pressed. */

    if ((ev->mods & (KM_CTRL | KM_ALT)) != 0)

        return 0;

    if (((ev->mods & KM_SHIFT) != 0) ^ ((ev->mods & KM_CAPS_LOCK) != 0))

        c = translate(ev->key, map_hacek_ucase, sizeof(map_hacek_ucase) / sizeof(wchar_t));

    else

        c = translate(ev->key, map_hacek_lcase, sizeof(map_hacek_lcase) / sizeof(wchar_t));

    return c;

}

static wchar_t parse_ms_carka(console_event_t *ev)

{

    wchar_t c;

    mstate = ms_start;

    /* Produce no characters when Ctrl or Alt is pressed. */

    if ((ev->mods & (KM_CTRL | KM_ALT)) != 0)

        return 0;

    if (((ev->mods & KM_SHIFT) != 0) ^ ((ev->mods & KM_CAPS_LOCK) != 0))

        c = translate(ev->key, map_carka_ucase, sizeof(map_carka_ucase) / sizeof(wchar_t));

    else

        c = translate(ev->key, map_carka_lcase, sizeof(map_carka_lcase) / sizeof(wchar_t));

    return c;

}

static wchar_t parse_ms_start(console_event_t *ev)

{

    wchar_t c;

    /* Produce no characters when Ctrl or Alt is pressed. */

    if ((ev->mods & (KM_CTRL | KM_ALT)) != 0)

        return 0;

    if (ev->key == KC_EQUALS) {

        if ((ev->mods & KM_SHIFT) != 0)

            mstate = ms_hacek;

        else

            mstate = ms_carka;

        return 0;

    }

    c = translate(ev->key, map_neutral, sizeof(map_neutral) / sizeof(wchar_t));

    if (c != 0)

        return c;

    if ((ev->mods & KM_SHIFT) == 0) {

        if ((ev->mods & KM_CAPS_LOCK) != 0)

            c = translate(ev->key, map_ns_caps, sizeof(map_ns_caps) / sizeof(wchar_t));

        else

            c = translate(ev->key, map_ns_nocaps, sizeof(map_ns_nocaps) / sizeof(wchar_t));

        if (c != 0)

            return c;

    }  

    if (((ev->mods & KM_SHIFT) != 0) ^ ((ev->mods & KM_CAPS_LOCK) != 0))

        c = translate(ev->key, map_ucase, sizeof(map_ucase) / sizeof(wchar_t));

    else

        c = translate(ev->key, map_lcase, sizeof(map_lcase) / sizeof(wchar_t));

    if (c != 0)

        return c;

    if ((ev->mods & KM_SHIFT) != 0)

        c = translate(ev->key, map_shifted, sizeof(map_shifted) / sizeof(wchar_t));

    else

        c = translate(ev->key, map_not_shifted, sizeof(map_not_shifted) / sizeof(wchar_t));

    if (c != 0)

        return c;

    if ((ev->mods & KM_NUM_LOCK) != 0)

        c = translate(ev->key, map_numeric, sizeof(map_numeric) / sizeof(wchar_t));

    else

        c = 0;

    return c;

}

static bool key_is_mod(unsigned key)

{

    switch (key) {

    case KC_LSHIFT:

    case KC_RSHIFT:

    case KC_LALT:

    case KC_RALT:

    case KC_LCTRL:

    case KC_RCTRL:

        return true;

    default:

        return false;

    }

}

static void layout_reset(void)

{

    mstate = ms_start;

}

static wchar_t layout_parse_ev(console_event_t *ev)

{

    if (ev->type != KEY_PRESS)

        return 0;

    if (key_is_mod(ev->key))

        return 0;

    switch (mstate) {

    case ms_start:

        return parse_ms_start(ev);

    case ms_hacek:

        return parse_ms_hacek(ev);

    case ms_carka:

        return parse_ms_carka(ev);

    }

    return 0;

}

/**

 * @}

 */