/*
 * 86Box    A hypervisor and IBM PC system emulator that specializes in
 *          running old operating systems and software designed for IBM
 *          PC systems and compatibles from 1981 through fairly recent
 *          system designs based on the PCI bus.
 *
 *          This file is part of the 86Box distribution.
 *
 *          xkbcommon keyboard input module.
 *
 *
 *
 * Authors: RichardG, <richardg867@gmail.com>
 *
 *          Copyright 2023 RichardG.
 */
extern "C" {
#include <xkbcommon/xkbcommon.h>
};

#include <unordered_map>
#include <QtDebug>
#include "evdev_keyboard.hpp"

#define IS_DEC_DIGIT(c) (((c) >= '0') && ((c) <= '9'))
#define IS_HEX_DIGIT(c) (IS_DEC_DIGIT(c) || (((c) >= 'A') && ((c) <= 'F')) || (((c) >= 'a') && ((c) <= 'f')))

static std::unordered_map<std::string, uint16_t> xkb_keycodes = {
    {"ESC",  0x01},
    {"AE01", 0x02},
    {"AE02", 0x03},
    {"AE03", 0x04},
    {"AE04", 0x05},
    {"AE05", 0x06},
    {"AE06", 0x07},
    {"AE07", 0x08},
    {"AE08", 0x09},
    {"AE09", 0x0a},
    {"AE10", 0x0b},
    {"AE11", 0x0c},
    {"AE12", 0x0d},
    {"BKSP", 0x0e},

    {"TAB",  0x0f},
    {"AD01", 0x10},
    {"AD02", 0x11},
    {"AD03", 0x12},
    {"AD04", 0x13},
    {"AD05", 0x14},
    {"AD06", 0x15},
    {"AD07", 0x16},
    {"AD08", 0x17},
    {"AD09", 0x18},
    {"AD10", 0x19},
    {"AD11", 0x1a},
    {"AD12", 0x1b},
    {"RTRN", 0x1c},
    {"LNFD", 0x1c}, /* linefeed => Enter */

    {"LCTL", 0x1d},
    {"AC01", 0x1e},
    {"AC02", 0x1f},
    {"AC03", 0x20},
    {"AC04", 0x21},
    {"AC05", 0x22},
    {"AC06", 0x23},
    {"AC07", 0x24},
    {"AC08", 0x25},
    {"AC09", 0x26},
    {"AC10", 0x27},
    {"AC11", 0x28},

    {"TLDE", 0x29},
    {"LFSH", 0x2a},
    {"BKSL", 0x2b},
    {"AB01", 0x2c},
    {"AB02", 0x2d},
    {"AB03", 0x2e},
    {"AB04", 0x2f},
    {"AB05", 0x30},
    {"AB06", 0x31},
    {"AB07", 0x32},
    {"AB08", 0x33},
    {"AB09", 0x34},
    {"AB10", 0x35},
    {"RTSH", 0x36},

    {"KPMU", 0x37},
    {"LALT", 0x38},
    {"SPCE", 0x39},
    {"CAPS", 0x3a},
    {"FK01", 0x3b},
    {"FK02", 0x3c},
    {"FK03", 0x3d},
    {"FK04", 0x3e},
    {"FK05", 0x3f},
    {"FK06", 0x40},
    {"FK07", 0x41},
    {"FK08", 0x42},
    {"FK09", 0x43},
    {"FK10", 0x44},

    {"NMLK", 0x45},
    {"SCLK", 0x46},
    {"FK14", 0x46}, /* F14 => Scroll Lock (for Apple keyboards) */
    {"KP7",  0x47},
    {"KP8",  0x48},
    {"KP9",  0x49},
    {"KPSU", 0x4a},
    {"KP4",  0x4b},
    {"KP5",  0x4c},
    {"KP6",  0x4d},
    {"KPAD", 0x4e},
    {"KP1",  0x4f},
    {"KP2",  0x50},
    {"KP3",  0x51},
    {"KP0",  0x52},
    {"KPDL", 0x53},

    {"LSGT", 0x56},
    {"FK11", 0x57},
    {"FK12", 0x58},
    {"FK16", 0x5d}, /* F16 => F13 */
    {"FK17", 0x5e}, /* F17 => F14 */
    {"FK18", 0x5f}, /* F18 => F15 */

    /* Japanese keys. */
    {"JPCM", 0x5c}, /* Num, */
    {"KPDC", 0x5c},
    {"HKTG", 0x70}, /* hiragana-katakana toggle */
    {"AB11", 0x73}, /* \_ and Brazilian /? */
    {"HZTG", 0x76}, /* hankaku-zenkaku toggle */
    {"HIRA", 0x77},
    {"KATA", 0x78},
    {"HENK", 0x79},
    {"KANA", 0x79}, /* kana => henkan (for Apple keyboards) */
    {"MUHE", 0x7b},
    {"EISU", 0x7b}, /* eisu => muhenkan (for Apple keyboards) */
    {"AE13", 0x7d}, /* \| */
    {"KPPT", 0x7e}, /* Brazilian Num. */
    {"I06",  0x7e}, /* alias of KPPT on keycodes/xfree86 (i.e. X11 forwarding) */

    /* Korean keys. */
    {"HJCV", 0xf1}, /* hancha toggle */
    {"HNGL", 0xf2}, /* latin toggle */

    {"KPEN", 0x11c},
    {"RCTL", 0x11d},
    {"KPDV", 0x135},
    {"PRSC", 0x137},
    {"SYRQ", 0x137},
    {"FK13", 0x137}, /* F13 => SysRq (for Apple keyboards) */
    {"RALT", 0x138},
    {"ALGR", 0x138},
    {"LVL3", 0x138}, /* observed on TigerVNC with AltGr-enabled layout */
    {"PAUS", 0x145},
    {"FK15", 0x145}, /* F15 => Pause (for Apple keyboards) */
    {"BRK",  0x145},
    {"HOME", 0x147},
    {"UP",   0x148},
    {"PGUP", 0x149},
    {"LEFT", 0x14b},
    {"RGHT", 0x14d},
    {"END",  0x14f},
    {"DOWN", 0x150},
    {"PGDN", 0x151},
    {"INS",  0x152},
    {"DELE", 0x153},

    {"LWIN", 0x15b},
    {"LMTA", 0x15b},
    {"RWIN", 0x15c},
    {"RMTA", 0x15c},
    {"MENU", 0x15d},
    {"COMP", 0x15d}, /* Compose as Menu */

    /* Multimedia keys. Same notes as evdev_keyboard apply here. */
    {"KPEQ", 0x59},  /* Num= */
    {"FRNT", 0x101}, /* # Logitech Task Select */
    {"UNDO", 0x108}, /* # */
    {"PAST", 0x10a}, /* # Paste */
    {"FIND", 0x112}, /* # Logitech */
    {"CUT",  0x117}, /* # */
    {"COPY", 0x118}, /* # */
    {"MUTE", 0x120},
    {"VOL-", 0x12e},
    {"VOL+", 0x130},
    {"HELP", 0x13b},
    {"OPEN", 0x13f},
    {"POWR", 0x15e},
    {"STOP", 0x168},
};
struct xkb_keymap *xkbcommon_keymap = nullptr;

void
xkbcommon_init(struct xkb_keymap *keymap)
{
    if (keymap)
        xkbcommon_keymap = keymap;
}

void
xkbcommon_close()
{
    xkbcommon_keymap = nullptr;
}

uint16_t
xkbcommon_translate(uint32_t keycode)
{
    const char *key_name = xkb_keymap_key_get_name(xkbcommon_keymap, keycode);

    /* If XKB doesn't know the key name for this keycode, assume an unnamed Ixxx key.
       This is useful for older XKB versions with an incomplete evdev keycode map. */
    auto key_name_s = key_name ? std::string(key_name) : QString("I%1").arg(keycode).toStdString();
    auto ret = xkb_keycodes[key_name_s];

    /* Observed with multimedia keys on Windows VcXsrv. */
    if (!ret && (key_name_s.length() == 3) && (key_name_s[0] == 'I') && IS_HEX_DIGIT(key_name_s[1]) && IS_HEX_DIGIT(key_name_s[2]))
        ret = 0x100 | stoi(key_name_s.substr(1), nullptr, 16);

    /* Translate unnamed evdev-specific keycodes. */
    if (!ret && (key_name_s.length() >= 2) && (key_name_s[0] == 'I') && IS_DEC_DIGIT(key_name_s[1]))
        ret = evdev_translate(stoi(key_name_s.substr(1)) - 8);

    if (!ret)
        qWarning() << "XKB Keyboard: Unknown key" << QString::number(keycode, 16) << QString::fromStdString(key_name_s);
#if 0
    else
        qInfo() << "XKB Keyboard: Key" << QString::number(keycode, 16) << QString::fromStdString(key_name_s) << "scancode" << QString::number(ret, 16);
#endif

    return ret;
}