#include <assert.h>
#include <stdint.h>
#include <stdarg.h>
#include <stdio.h>
#include <locale.h>

#define TB_IMPL
#include <termbox2.h>

struct key {
    unsigned char x;
    unsigned char y;
    uint32_t ch;
};

#define STOP {0,0,0}
struct key K_ESC[] = {{1,1,'E'},{2,1,'S'},{3,1,'C'},STOP};
struct key K_F1[] = {{6,1,'F'},{7,1,'1'},STOP};
struct key K_F2[] = {{9,1,'F'},{10,1,'2'},STOP};
struct key K_F3[] = {{12,1,'F'},{13,1,'3'},STOP};
struct key K_F4[] = {{15,1,'F'},{16,1,'4'},STOP};
struct key K_F5[] = {{19,1,'F'},{20,1,'5'},STOP};
struct key K_F6[] = {{22,1,'F'},{23,1,'6'},STOP};
struct key K_F7[] = {{25,1,'F'},{26,1,'7'},STOP};
struct key K_F8[] = {{28,1,'F'},{29,1,'8'},STOP};
struct key K_F9[] = {{33,1,'F'},{34,1,'9'},STOP};
struct key K_F10[] = {{36,1,'F'},{37,1,'1'},{38,1,'0'},STOP};
struct key K_F11[] = {{40,1,'F'},{41,1,'1'},{42,1,'1'},STOP};
struct key K_F12[] = {{44,1,'F'},{45,1,'1'},{46,1,'2'},STOP};
struct key K_PRN[] = {{50,1,'P'},{51,1,'R'},{52,1,'N'},STOP};
struct key K_SCR[] = {{54,1,'S'},{55,1,'C'},{56,1,'R'},STOP};
struct key K_BRK[] = {{58,1,'B'},{59,1,'R'},{60,1,'K'},STOP};
struct key K_LED1[] = {{66,1,'-'},STOP};
struct key K_LED2[] = {{70,1,'-'},STOP};
struct key K_LED3[] = {{74,1,'-'},STOP};

struct key K_TILDE[] = {{1,4,'`'},STOP};
struct key K_TILDE_SHIFT[] = {{1,4,'~'},STOP};
struct key K_1[] = {{4,4,'1'},STOP};
struct key K_1_SHIFT[] = {{4,4,'!'},STOP};
struct key K_2[] = {{7,4,'2'},STOP};
struct key K_2_SHIFT[] = {{7,4,'@'},STOP};
struct key K_3[] = {{10,4,'3'},STOP};
struct key K_3_SHIFT[] = {{10,4,'#'},STOP};
struct key K_4[] = {{13,4,'4'},STOP};
struct key K_4_SHIFT[] = {{13,4,'$'},STOP};
struct key K_5[] = {{16,4,'5'},STOP};
struct key K_5_SHIFT[] = {{16,4,'%'},STOP};
struct key K_6[] = {{19,4,'6'},STOP};
struct key K_6_SHIFT[] = {{19,4,'^'},STOP};
struct key K_7[] = {{22,4,'7'},STOP};
struct key K_7_SHIFT[] = {{22,4,'&'},STOP};
struct key K_8[] = {{25,4,'8'},STOP};
struct key K_8_SHIFT[] = {{25,4,'*'},STOP};
struct key K_9[] = {{28,4,'9'},STOP};
struct key K_9_SHIFT[] = {{28,4,'('},STOP};
struct key K_0[] = {{31,4,'0'},STOP};
struct key K_0_SHIFT[] = {{31,4,')'},STOP};
struct key K_MINUS[] = {{34,4,'-'},STOP};
struct key K_MINUS_SHIFT[] = {{34,4,'_'},STOP};
struct key K_EQUALS[] = {{37,4,'='},STOP};
struct key K_EQUALS_SHIFT[] = {{37,4,'+'},STOP};
struct key K_BACKSLASH[] = {{40,4,'\\'},STOP};
struct key K_BACKSLASH_SHIFT[] = {{40,4,'|'},STOP};
struct key K_BACKSPACE[] = {{44,4,0x2190},{45,4,0x2500},{46,4,0x2500},STOP};
struct key K_INS[] = {{50,4,'I'},{51,4,'N'},{52,4,'S'},STOP};
struct key K_HOM[] = {{54,4,'H'},{55,4,'O'},{56,4,'M'},STOP};
struct key K_PGU[] = {{58,4,'P'},{59,4,'G'},{60,4,'U'},STOP};
struct key K_K_NUMLOCK[] = {{65,4,'N'},STOP};
struct key K_K_SLASH[] = {{68,4,'/'},STOP};
struct key K_K_STAR[] = {{71,4,'*'},STOP};
struct key K_K_MINUS[] = {{74,4,'-'},STOP};

struct key K_TAB[] = {{1,6,'T'},{2,6,'A'},{3,6,'B'},STOP};
struct key K_q[] = {{6,6,'q'},STOP};
struct key K_Q[] = {{6,6,'Q'},STOP};
struct key K_w[] = {{9,6,'w'},STOP};
struct key K_W[] = {{9,6,'W'},STOP};
struct key K_e[] = {{12,6,'e'},STOP};
struct key K_E[] = {{12,6,'E'},STOP};
struct key K_r[] = {{15,6,'r'},STOP};
struct key K_R[] = {{15,6,'R'},STOP};
struct key K_t[] = {{18,6,'t'},STOP};
struct key K_T[] = {{18,6,'T'},STOP};
struct key K_y[] = {{21,6,'y'},STOP};
struct key K_Y[] = {{21,6,'Y'},STOP};
struct key K_u[] = {{24,6,'u'},STOP};
struct key K_U[] = {{24,6,'U'},STOP};
struct key K_i[] = {{27,6,'i'},STOP};
struct key K_I[] = {{27,6,'I'},STOP};
struct key K_o[] = {{30,6,'o'},STOP};
struct key K_O[] = {{30,6,'O'},STOP};
struct key K_p[] = {{33,6,'p'},STOP};
struct key K_P[] = {{33,6,'P'},STOP};
struct key K_LSQB[] = {{36,6,'['},STOP};
struct key K_LCUB[] = {{36,6,'{'},STOP};
struct key K_RSQB[] = {{39,6,']'},STOP};
struct key K_RCUB[] = {{39,6,'}'},STOP};
struct key K_ENTER[] = {
    {43,6,0x2591},{44,6,0x2591},{45,6,0x2591},{46,6,0x2591},
    {43,7,0x2591},{44,7,0x2591},{45,7,0x21B5},{46,7,0x2591},
    {41,8,0x2591},{42,8,0x2591},{43,8,0x2591},{44,8,0x2591},
    {45,8,0x2591},{46,8,0x2591},STOP
};
struct key K_DEL[] = {{50,6,'D'},{51,6,'E'},{52,6,'L'},STOP};
struct key K_END[] = {{54,6,'E'},{55,6,'N'},{56,6,'D'},STOP};
struct key K_PGD[] = {{58,6,'P'},{59,6,'G'},{60,6,'D'},STOP};
struct key K_K_7[] = {{65,6,'7'},STOP};
struct key K_K_8[] = {{68,6,'8'},STOP};
struct key K_K_9[] = {{71,6,'9'},STOP};
struct key K_K_PLUS[] = {{74,6,' '},{74,7,'+'},{74,8,' '},STOP};

struct key K_CAPS[] = {{1,8,'C'},{2,8,'A'},{3,8,'P'},{4,8,'S'},STOP};
struct key K_a[] = {{7,8,'a'},STOP};
struct key K_A[] = {{7,8,'A'},STOP};
struct key K_s[] = {{10,8,'s'},STOP};
struct key K_S[] = {{10,8,'S'},STOP};
struct key K_d[] = {{13,8,'d'},STOP};
struct key K_D[] = {{13,8,'D'},STOP};
struct key K_f[] = {{16,8,'f'},STOP};
struct key K_F[] = {{16,8,'F'},STOP};
struct key K_g[] = {{19,8,'g'},STOP};
struct key K_G[] = {{19,8,'G'},STOP};
struct key K_h[] = {{22,8,'h'},STOP};
struct key K_H[] = {{22,8,'H'},STOP};
struct key K_j[] = {{25,8,'j'},STOP};
struct key K_J[] = {{25,8,'J'},STOP};
struct key K_k[] = {{28,8,'k'},STOP};
struct key K_K[] = {{28,8,'K'},STOP};
struct key K_l[] = {{31,8,'l'},STOP};
struct key K_L[] = {{31,8,'L'},STOP};
struct key K_SEMICOLON[] = {{34,8,';'},STOP};
struct key K_PARENTHESIS[] = {{34,8,':'},STOP};
struct key K_QUOTE[] = {{37,8,'\''},STOP};
struct key K_DOUBLEQUOTE[] = {{37,8,'"'},STOP};
struct key K_K_4[] = {{65,8,'4'},STOP};
struct key K_K_5[] = {{68,8,'5'},STOP};
struct key K_K_6[] = {{71,8,'6'},STOP};

struct key K_LSHIFT[] = {{1,10,'S'},{2,10,'H'},{3,10,'I'},{4,10,'F'},{5,10,'T'},STOP};
struct key K_z[] = {{9,10,'z'},STOP};
struct key K_Z[] = {{9,10,'Z'},STOP};
struct key K_x[] = {{12,10,'x'},STOP};
struct key K_X[] = {{12,10,'X'},STOP};
struct key K_c[] = {{15,10,'c'},STOP};
struct key K_C[] = {{15,10,'C'},STOP};
struct key K_v[] = {{18,10,'v'},STOP};
struct key K_V[] = {{18,10,'V'},STOP};
struct key K_b[] = {{21,10,'b'},STOP};
struct key K_B[] = {{21,10,'B'},STOP};
struct key K_n[] = {{24,10,'n'},STOP};
struct key K_N[] = {{24,10,'N'},STOP};
struct key K_m[] = {{27,10,'m'},STOP};
struct key K_M[] = {{27,10,'M'},STOP};
struct key K_COMMA[] = {{30,10,','},STOP};
struct key K_LANB[] = {{30,10,'<'},STOP};
struct key K_PERIOD[] = {{33,10,'.'},STOP};
struct key K_RANB[] = {{33,10,'>'},STOP};
struct key K_SLASH[] = {{36,10,'/'},STOP};
struct key K_QUESTION[] = {{36,10,'?'},STOP};
struct key K_RSHIFT[] = {{42,10,'S'},{43,10,'H'},{44,10,'I'},{45,10,'F'},{46,10,'T'},STOP};
struct key K_ARROW_UP[] = {{54,10,'('},{55,10,0x2191},{56,10,')'},STOP};
struct key K_K_1[] = {{65,10,'1'},STOP};
struct key K_K_2[] = {{68,10,'2'},STOP};
struct key K_K_3[] = {{71,10,'3'},STOP};
struct key K_K_ENTER[] = {{74,10,0x2591},{74,11,0x2591},{74,12,0x2591},STOP};

struct key K_LCTRL[] = {{1,12,'C'},{2,12,'T'},{3,12,'R'},{4,12,'L'},STOP};
struct key K_LWIN[] = {{6,12,'W'},{7,12,'I'},{8,12,'N'},STOP};
struct key K_LALT[] = {{10,12,'A'},{11,12,'L'},{12,12,'T'},STOP};
struct key K_SPACE[] = {
    {14,12,' '},{15,12,' '},{16,12,' '},{17,12,' '},{18,12,' '},
    {19,12,'S'},{20,12,'P'},{21,12,'A'},{22,12,'C'},{23,12,'E'},
    {24,12,' '},{25,12,' '},{26,12,' '},{27,12,' '},{28,12,' '},
    STOP
};
struct key K_RALT[] = {{30,12,'A'},{31,12,'L'},{32,12,'T'},STOP};
struct key K_RWIN[] = {{34,12,'W'},{35,12,'I'},{36,12,'N'},STOP};
struct key K_RPROP[] = {{38,12,'P'},{39,12,'R'},{40,12,'O'},{41,12,'P'},STOP};
struct key K_RCTRL[] = {{43,12,'C'},{44,12,'T'},{45,12,'R'},{46,12,'L'},STOP};
struct key K_ARROW_LEFT[] = {{50,12,'('},{51,12,0x2190},{52,12,')'},STOP};
struct key K_ARROW_DOWN[] = {{54,12,'('},{55,12,0x2193},{56,12,')'},STOP};
struct key K_ARROW_RIGHT[] = {{58,12,'('},{59,12,0x2192},{60,12,')'},STOP};
struct key K_K_0[] = {{65,12,' '},{66,12,'0'},{67,12,' '},{68,12,' '},STOP};
struct key K_K_PERIOD[] = {{71,12,'.'},STOP};

struct combo {
    struct key *keys[6];
};

struct combo combos[] = {
    {{K_TILDE, K_2, K_LCTRL, K_RCTRL, 0}},
    {{K_A, K_LCTRL, K_RCTRL, 0}},
    {{K_B, K_LCTRL, K_RCTRL, 0}},
    {{K_C, K_LCTRL, K_RCTRL, 0}},
    {{K_D, K_LCTRL, K_RCTRL, 0}},
    {{K_E, K_LCTRL, K_RCTRL, 0}},
    {{K_F, K_LCTRL, K_RCTRL, 0}},
    {{K_G, K_LCTRL, K_RCTRL, 0}},
    {{K_H, K_BACKSPACE, K_LCTRL, K_RCTRL, 0}},
    {{K_I, K_TAB, K_LCTRL, K_RCTRL, 0}},
    {{K_J, K_LCTRL, K_RCTRL, 0}},
    {{K_K, K_LCTRL, K_RCTRL, 0}},
    {{K_L, K_LCTRL, K_RCTRL, 0}},
    {{K_M, K_ENTER, K_K_ENTER, K_LCTRL, K_RCTRL, 0}},
    {{K_N, K_LCTRL, K_RCTRL, 0}},
    {{K_O, K_LCTRL, K_RCTRL, 0}},
    {{K_P, K_LCTRL, K_RCTRL, 0}},
    {{K_Q, K_LCTRL, K_RCTRL, 0}},
    {{K_R, K_LCTRL, K_RCTRL, 0}},
    {{K_S, K_LCTRL, K_RCTRL, 0}},
    {{K_T, K_LCTRL, K_RCTRL, 0}},
    {{K_U, K_LCTRL, K_RCTRL, 0}},
    {{K_V, K_LCTRL, K_RCTRL, 0}},
    {{K_W, K_LCTRL, K_RCTRL, 0}},
    {{K_X, K_LCTRL, K_RCTRL, 0}},
    {{K_Y, K_LCTRL, K_RCTRL, 0}},
    {{K_Z, K_LCTRL, K_RCTRL, 0}},
    {{K_LSQB, K_ESC, K_3, K_LCTRL, K_RCTRL, 0}},
    {{K_4, K_BACKSLASH, K_LCTRL, K_RCTRL, 0}},
    {{K_RSQB, K_5, K_LCTRL, K_RCTRL, 0}},
    {{K_6, K_LCTRL, K_RCTRL, 0}},
    {{K_7, K_SLASH, K_MINUS_SHIFT, K_LCTRL, K_RCTRL, 0}},
    {{K_SPACE,0}},
    {{K_1_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_DOUBLEQUOTE,K_LSHIFT,K_RSHIFT,0}},
    {{K_3_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_4_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_5_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_7_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_QUOTE,0}},
    {{K_9_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_0_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_8_SHIFT,K_K_STAR,K_LSHIFT,K_RSHIFT,0}},
    {{K_EQUALS_SHIFT,K_K_PLUS,K_LSHIFT,K_RSHIFT,0}},
    {{K_COMMA,0}},
    {{K_MINUS,K_K_MINUS,0}},
    {{K_PERIOD,K_K_PERIOD,0}},
    {{K_SLASH,K_K_SLASH,0}},
    {{K_0,K_K_0,0}},
    {{K_1,K_K_1,0}},
    {{K_2,K_K_2,0}},
    {{K_3,K_K_3,0}},
    {{K_4,K_K_4,0}},
    {{K_5,K_K_5,0}},
    {{K_6,K_K_6,0}},
    {{K_7,K_K_7,0}},
    {{K_8,K_K_8,0}},
    {{K_9,K_K_9,0}},
    {{K_PARENTHESIS,K_LSHIFT,K_RSHIFT,0}},
    {{K_SEMICOLON,0}},
    {{K_LANB,K_LSHIFT,K_RSHIFT,0}},
    {{K_EQUALS,0}},
    {{K_RANB,K_LSHIFT,K_RSHIFT,0}},
    {{K_QUESTION,K_LSHIFT,K_RSHIFT,0}},
    {{K_2_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_A,K_LSHIFT,K_RSHIFT,0}},
    {{K_B,K_LSHIFT,K_RSHIFT,0}},
    {{K_C,K_LSHIFT,K_RSHIFT,0}},
    {{K_D,K_LSHIFT,K_RSHIFT,0}},
    {{K_E,K_LSHIFT,K_RSHIFT,0}},
    {{K_F,K_LSHIFT,K_RSHIFT,0}},
    {{K_G,K_LSHIFT,K_RSHIFT,0}},
    {{K_H,K_LSHIFT,K_RSHIFT,0}},
    {{K_I,K_LSHIFT,K_RSHIFT,0}},
    {{K_J,K_LSHIFT,K_RSHIFT,0}},
    {{K_K,K_LSHIFT,K_RSHIFT,0}},
    {{K_L,K_LSHIFT,K_RSHIFT,0}},
    {{K_M,K_LSHIFT,K_RSHIFT,0}},
    {{K_N,K_LSHIFT,K_RSHIFT,0}},
    {{K_O,K_LSHIFT,K_RSHIFT,0}},
    {{K_P,K_LSHIFT,K_RSHIFT,0}},
    {{K_Q,K_LSHIFT,K_RSHIFT,0}},
    {{K_R,K_LSHIFT,K_RSHIFT,0}},
    {{K_S,K_LSHIFT,K_RSHIFT,0}},
    {{K_T,K_LSHIFT,K_RSHIFT,0}},
    {{K_U,K_LSHIFT,K_RSHIFT,0}},
    {{K_V,K_LSHIFT,K_RSHIFT,0}},
    {{K_W,K_LSHIFT,K_RSHIFT,0}},
    {{K_X,K_LSHIFT,K_RSHIFT,0}},
    {{K_Y,K_LSHIFT,K_RSHIFT,0}},
    {{K_Z,K_LSHIFT,K_RSHIFT,0}},
    {{K_LSQB,0}},
    {{K_BACKSLASH,0}},
    {{K_RSQB,0}},
    {{K_6_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_MINUS_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_TILDE,0}},
    {{K_a,0}},
    {{K_b,0}},
    {{K_c,0}},
    {{K_d,0}},
    {{K_e,0}},
    {{K_f,0}},
    {{K_g,0}},
    {{K_h,0}},
    {{K_i,0}},
    {{K_j,0}},
    {{K_k,0}},
    {{K_l,0}},
    {{K_m,0}},
    {{K_n,0}},
    {{K_o,0}},
    {{K_p,0}},
    {{K_q,0}},
    {{K_r,0}},
    {{K_s,0}},
    {{K_t,0}},
    {{K_u,0}},
    {{K_v,0}},
    {{K_w,0}},
    {{K_x,0}},
    {{K_y,0}},
    {{K_z,0}},
    {{K_LCUB,K_LSHIFT,K_RSHIFT,0}},
    {{K_BACKSLASH_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_RCUB,K_LSHIFT,K_RSHIFT,0}},
    {{K_TILDE_SHIFT,K_LSHIFT,K_RSHIFT,0}},
    {{K_8, K_BACKSPACE, K_LCTRL, K_RCTRL, 0}}
};

struct combo func_combos[] = {
    {{K_F1,0}},
    {{K_F2,0}},
    {{K_F3,0}},
    {{K_F4,0}},
    {{K_F5,0}},
    {{K_F6,0}},
    {{K_F7,0}},
    {{K_F8,0}},
    {{K_F9,0}},
    {{K_F10,0}},
    {{K_F11,0}},
    {{K_F12,0}},
    {{K_INS,0}},
    {{K_DEL,0}},
    {{K_HOM,0}},
    {{K_END,0}},
    {{K_PGU,0}},
    {{K_PGD,0}},
    {{K_ARROW_UP,0}},
    {{K_ARROW_DOWN,0}},
    {{K_ARROW_LEFT,0}},
    {{K_ARROW_RIGHT,0}}
};

void print_tb(const char *str, int x, int y, uint16_t fg, uint16_t bg)
{
    while (*str) {
        uint32_t uni;
        str += tb_utf8_char_to_unicode(&uni, str);
        tb_set_cell(x, y, uni, fg, bg);
        x++;
    }
}

void printf_tb(int x, int y, uint16_t fg, uint16_t bg, const char *fmt, ...)
{
    char buf[4096];
    va_list vl;
    va_start(vl, fmt);
    vsnprintf(buf, sizeof(buf), fmt, vl);
    va_end(vl);
    print_tb(buf, x, y, fg, bg);
}

void draw_key(struct key *k, uint16_t fg, uint16_t bg)
{
    while (k->x) {
        tb_set_cell(k->x+2, k->y+4, k->ch, fg, bg);
        k++;
    }
}

void draw_keyboard(void)
{
    int i;
    tb_set_cell(0, 0, 0x250C, TB_WHITE, TB_DEFAULT);
    tb_set_cell(79, 0, 0x2510, TB_WHITE, TB_DEFAULT);
    tb_set_cell(0, 23, 0x2514, TB_WHITE, TB_DEFAULT);
    tb_set_cell(79, 23, 0x2518, TB_WHITE, TB_DEFAULT);

    for (i = 1; i < 79; ++i) {
        tb_set_cell(i, 0, 0x2500, TB_WHITE, TB_DEFAULT);
        tb_set_cell(i, 23, 0x2500, TB_WHITE, TB_DEFAULT);
        tb_set_cell(i, 17, 0x2500, TB_WHITE, TB_DEFAULT);
        tb_set_cell(i, 4, 0x2500, TB_WHITE, TB_DEFAULT);
    }
    for (i = 1; i < 23; ++i) {
        tb_set_cell(0, i, 0x2502, TB_WHITE, TB_DEFAULT);
        tb_set_cell(79, i, 0x2502, TB_WHITE, TB_DEFAULT);
    }
    tb_set_cell(0, 17, 0x251C, TB_WHITE, TB_DEFAULT);
    tb_set_cell(79, 17, 0x2524, TB_WHITE, TB_DEFAULT);
    tb_set_cell(0, 4, 0x251C, TB_WHITE, TB_DEFAULT);
    tb_set_cell(79, 4, 0x2524, TB_WHITE, TB_DEFAULT);
    for (i = 5; i < 17; ++i) {
        tb_set_cell(1, i, 0x2588, TB_YELLOW, TB_YELLOW);
        tb_set_cell(78, i, 0x2588, TB_YELLOW, TB_YELLOW);
    }

    draw_key(K_ESC, TB_WHITE, TB_BLUE);
    draw_key(K_F1, TB_WHITE, TB_BLUE);
    draw_key(K_F2, TB_WHITE, TB_BLUE);
    draw_key(K_F3, TB_WHITE, TB_BLUE);
    draw_key(K_F4, TB_WHITE, TB_BLUE);
    draw_key(K_F5, TB_WHITE, TB_BLUE);
    draw_key(K_F6, TB_WHITE, TB_BLUE);
    draw_key(K_F7, TB_WHITE, TB_BLUE);
    draw_key(K_F8, TB_WHITE, TB_BLUE);
    draw_key(K_F9, TB_WHITE, TB_BLUE);
    draw_key(K_F10, TB_WHITE, TB_BLUE);
    draw_key(K_F11, TB_WHITE, TB_BLUE);
    draw_key(K_F12, TB_WHITE, TB_BLUE);
    draw_key(K_PRN, TB_WHITE, TB_BLUE);
    draw_key(K_SCR, TB_WHITE, TB_BLUE);
    draw_key(K_BRK, TB_WHITE, TB_BLUE);
    draw_key(K_LED1, TB_WHITE, TB_BLUE);
    draw_key(K_LED2, TB_WHITE, TB_BLUE);
    draw_key(K_LED3, TB_WHITE, TB_BLUE);

    draw_key(K_TILDE, TB_WHITE, TB_BLUE);
    draw_key(K_1, TB_WHITE, TB_BLUE);
    draw_key(K_2, TB_WHITE, TB_BLUE);
    draw_key(K_3, TB_WHITE, TB_BLUE);
    draw_key(K_4, TB_WHITE, TB_BLUE);
    draw_key(K_5, TB_WHITE, TB_BLUE);
    draw_key(K_6, TB_WHITE, TB_BLUE);
    draw_key(K_7, TB_WHITE, TB_BLUE);
    draw_key(K_8, TB_WHITE, TB_BLUE);
    draw_key(K_9, TB_WHITE, TB_BLUE);
    draw_key(K_0, TB_WHITE, TB_BLUE);
    draw_key(K_MINUS, TB_WHITE, TB_BLUE);
    draw_key(K_EQUALS, TB_WHITE, TB_BLUE);
    draw_key(K_BACKSLASH, TB_WHITE, TB_BLUE);
    draw_key(K_BACKSPACE, TB_WHITE, TB_BLUE);
    draw_key(K_INS, TB_WHITE, TB_BLUE);
    draw_key(K_HOM, TB_WHITE, TB_BLUE);
    draw_key(K_PGU, TB_WHITE, TB_BLUE);
    draw_key(K_K_NUMLOCK, TB_WHITE, TB_BLUE);
    draw_key(K_K_SLASH, TB_WHITE, TB_BLUE);
    draw_key(K_K_STAR, TB_WHITE, TB_BLUE);
    draw_key(K_K_MINUS, TB_WHITE, TB_BLUE);

    draw_key(K_TAB, TB_WHITE, TB_BLUE);
    draw_key(K_q, TB_WHITE, TB_BLUE);
    draw_key(K_w, TB_WHITE, TB_BLUE);
    draw_key(K_e, TB_WHITE, TB_BLUE);
    draw_key(K_r, TB_WHITE, TB_BLUE);
    draw_key(K_t, TB_WHITE, TB_BLUE);
    draw_key(K_y, TB_WHITE, TB_BLUE);
    draw_key(K_u, TB_WHITE, TB_BLUE);
    draw_key(K_i, TB_WHITE, TB_BLUE);
    draw_key(K_o, TB_WHITE, TB_BLUE);
    draw_key(K_p, TB_WHITE, TB_BLUE);
    draw_key(K_LSQB, TB_WHITE, TB_BLUE);
    draw_key(K_RSQB, TB_WHITE, TB_BLUE);
    draw_key(K_ENTER, TB_WHITE, TB_BLUE);
    draw_key(K_DEL, TB_WHITE, TB_BLUE);
    draw_key(K_END, TB_WHITE, TB_BLUE);
    draw_key(K_PGD, TB_WHITE, TB_BLUE);
    draw_key(K_K_7, TB_WHITE, TB_BLUE);
    draw_key(K_K_8, TB_WHITE, TB_BLUE);
    draw_key(K_K_9, TB_WHITE, TB_BLUE);
    draw_key(K_K_PLUS, TB_WHITE, TB_BLUE);

    draw_key(K_CAPS, TB_WHITE, TB_BLUE);
    draw_key(K_a, TB_WHITE, TB_BLUE);
    draw_key(K_s, TB_WHITE, TB_BLUE);
    draw_key(K_d, TB_WHITE, TB_BLUE);
    draw_key(K_f, TB_WHITE, TB_BLUE);
    draw_key(K_g, TB_WHITE, TB_BLUE);
    draw_key(K_h, TB_WHITE, TB_BLUE);
    draw_key(K_j, TB_WHITE, TB_BLUE);
    draw_key(K_k, TB_WHITE, TB_BLUE);
    draw_key(K_l, TB_WHITE, TB_BLUE);
    draw_key(K_SEMICOLON, TB_WHITE, TB_BLUE);
    draw_key(K_QUOTE, TB_WHITE, TB_BLUE);
    draw_key(K_K_4, TB_WHITE, TB_BLUE);
    draw_key(K_K_5, TB_WHITE, TB_BLUE);
    draw_key(K_K_6, TB_WHITE, TB_BLUE);

    draw_key(K_LSHIFT, TB_WHITE, TB_BLUE);
    draw_key(K_z, TB_WHITE, TB_BLUE);
    draw_key(K_x, TB_WHITE, TB_BLUE);
    draw_key(K_c, TB_WHITE, TB_BLUE);
    draw_key(K_v, TB_WHITE, TB_BLUE);
    draw_key(K_b, TB_WHITE, TB_BLUE);
    draw_key(K_n, TB_WHITE, TB_BLUE);
    draw_key(K_m, TB_WHITE, TB_BLUE);
    draw_key(K_COMMA, TB_WHITE, TB_BLUE);
    draw_key(K_PERIOD, TB_WHITE, TB_BLUE);
    draw_key(K_SLASH, TB_WHITE, TB_BLUE);
    draw_key(K_RSHIFT, TB_WHITE, TB_BLUE);
    draw_key(K_ARROW_UP, TB_WHITE, TB_BLUE);
    draw_key(K_K_1, TB_WHITE, TB_BLUE);
    draw_key(K_K_2, TB_WHITE, TB_BLUE);
    draw_key(K_K_3, TB_WHITE, TB_BLUE);
    draw_key(K_K_ENTER, TB_WHITE, TB_BLUE);

    draw_key(K_LCTRL, TB_WHITE, TB_BLUE);
    draw_key(K_LWIN, TB_WHITE, TB_BLUE);
    draw_key(K_LALT, TB_WHITE, TB_BLUE);
    draw_key(K_SPACE, TB_WHITE, TB_BLUE);
    draw_key(K_RCTRL, TB_WHITE, TB_BLUE);
    draw_key(K_RPROP, TB_WHITE, TB_BLUE);
    draw_key(K_RWIN, TB_WHITE, TB_BLUE);
    draw_key(K_RALT, TB_WHITE, TB_BLUE);
    draw_key(K_ARROW_LEFT, TB_WHITE, TB_BLUE);
    draw_key(K_ARROW_DOWN, TB_WHITE, TB_BLUE);
    draw_key(K_ARROW_RIGHT, TB_WHITE, TB_BLUE);
    draw_key(K_K_0, TB_WHITE, TB_BLUE);
    draw_key(K_K_PERIOD, TB_WHITE, TB_BLUE);

    printf_tb(33, 1, (uint16_t)(TB_MAGENTA | TB_BOLD), TB_DEFAULT, "Keyboard demo!");
    printf_tb(21, 2, TB_MAGENTA, TB_DEFAULT, "(press CTRL+X and then CTRL+Q to exit)");
    printf_tb(15, 3, TB_MAGENTA, TB_DEFAULT, "(press CTRL+X and then CTRL+C to change input mode)");

    int inputmode = tb_set_input_mode(0);
    char inputmode_str[64];

    if (inputmode & TB_INPUT_ESC)
        sprintf(inputmode_str, "TB_INPUT_ESC");
    if (inputmode & TB_INPUT_ALT)
        sprintf(inputmode_str, "TB_INPUT_ALT");
    if (inputmode & TB_INPUT_MOUSE)
        sprintf(inputmode_str + 12, " | TB_INPUT_MOUSE");

    printf_tb(3, 18, TB_WHITE, TB_DEFAULT, "Input mode: %s", inputmode_str);
}

const char *funckeymap(int k)
{
    static const char *fcmap[] = {
        "CTRL+2, CTRL+~",
        "CTRL+A",
        "CTRL+B",
        "CTRL+C",
        "CTRL+D",
        "CTRL+E",
        "CTRL+F",
        "CTRL+G",
        "CTRL+H, BACKSPACE",
        "CTRL+I, TAB",
        "CTRL+J",
        "CTRL+K",
        "CTRL+L",
        "CTRL+M, ENTER",
        "CTRL+N",
        "CTRL+O",
        "CTRL+P",
        "CTRL+Q",
        "CTRL+R",
        "CTRL+S",
        "CTRL+T",
        "CTRL+U",
        "CTRL+V",
        "CTRL+W",
        "CTRL+X",
        "CTRL+Y",
        "CTRL+Z",
        "CTRL+3, ESC, CTRL+[",
        "CTRL+4, CTRL+\\",
        "CTRL+5, CTRL+]",
        "CTRL+6",
        "CTRL+7, CTRL+/, CTRL+_",
        "SPACE"
    };
    static const char *fkmap[] = {
        "F1",
        "F2",
        "F3",
        "F4",
        "F5",
        "F6",
        "F7",
        "F8",
        "F9",
        "F10",
        "F11",
        "F12",
        "INSERT",
        "DELETE",
        "HOME",
        "END",
        "PGUP",
        "PGDN",
        "ARROW UP",
        "ARROW DOWN",
        "ARROW LEFT",
        "ARROW RIGHT"
    };

    if (k == TB_KEY_CTRL_8)
        return "CTRL+8, BACKSPACE 2"; /* 0x7F */
    else if (k >= TB_KEY_ARROW_RIGHT && k <= 0xFFFF)
        return fkmap[0xFFFF-k];
    else if (k <= TB_KEY_SPACE)
        return fcmap[k];
    return "UNKNOWN";
}

void pretty_print_press(struct tb_event *ev)
{
    char buf[7];
    buf[tb_utf8_unicode_to_char(buf, ev->ch)] = '\0';
    printf_tb(3, 19, TB_WHITE , TB_DEFAULT, "Key: ");
    printf_tb(8, 19, TB_YELLOW, TB_DEFAULT, "decimal: %d", ev->key);
    printf_tb(8, 20, TB_GREEN , TB_DEFAULT, "hex:     0x%X", ev->key);
    printf_tb(8, 21, TB_CYAN  , TB_DEFAULT, "octal:   0%o", ev->key);
    printf_tb(8, 22, TB_RED   , TB_DEFAULT, "string:  %s", funckeymap(ev->key));

    printf_tb(54, 19, TB_WHITE , TB_DEFAULT, "Char: ");
    printf_tb(60, 19, TB_YELLOW, TB_DEFAULT, "decimal: %d", ev->ch);
    printf_tb(60, 20, TB_GREEN , TB_DEFAULT, "hex:     0x%X", ev->ch);
    printf_tb(60, 21, TB_CYAN  , TB_DEFAULT, "octal:   0%o", ev->ch);
    printf_tb(60, 22, TB_RED   , TB_DEFAULT, "string:  %s", buf);

    printf_tb(54, 18, TB_WHITE, TB_DEFAULT, "Modifier: %c%c%c%c",
            (ev->mod & TB_MOD_CTRL)   ? 'C' : ' ',
            (ev->mod & TB_MOD_ALT)    ? 'A' : ' ',
            (ev->mod & TB_MOD_SHIFT)  ? 'S' : ' ',
            (ev->mod & TB_MOD_MOTION) ? 'M' : ' ');

}

void pretty_print_resize(struct tb_event *ev)
{
    printf_tb(3, 19, TB_WHITE, TB_DEFAULT, "Resize event: %d x %d", ev->w, ev->h);
}

int counter = 0;

void pretty_print_mouse(struct tb_event *ev) {
    printf_tb(3, 19, TB_WHITE, TB_DEFAULT, "Mouse event: %d x %d %c", ev->x, ev->y, (ev->mod & TB_MOD_MOTION) ? '*' : ' ');
    char *btn = "";
    switch (ev->key) {
    case TB_KEY_MOUSE_LEFT:
        btn = "MouseLeft: %d";
        break;
    case TB_KEY_MOUSE_MIDDLE:
        btn = "MouseMiddle: %d";
        break;
    case TB_KEY_MOUSE_RIGHT:
        btn = "MouseRight: %d";
        break;
    case TB_KEY_MOUSE_WHEEL_UP:
        btn = "MouseWheelUp: %d";
        break;
    case TB_KEY_MOUSE_WHEEL_DOWN:
        btn = "MouseWheelDown: %d";
        break;
    case TB_KEY_MOUSE_RELEASE:
        btn = "MouseRelease: %d";
    }
    counter++;
    printf_tb(43, 19, TB_WHITE, TB_DEFAULT, "Key: ");
    printf_tb(48, 19, TB_YELLOW, TB_DEFAULT, btn, counter);
}

void dispatch_press(struct tb_event *ev)
{
    if (ev->mod & TB_MOD_ALT) {
        draw_key(K_LALT, TB_WHITE, TB_RED);
        draw_key(K_RALT, TB_WHITE, TB_RED);
    }
    if (ev->mod & TB_MOD_CTRL) {
        draw_key(K_LCTRL, TB_WHITE, TB_RED);
        draw_key(K_RCTRL, TB_WHITE, TB_RED);
    }
    if (ev->mod & TB_MOD_SHIFT) {
        draw_key(K_LSHIFT, TB_WHITE, TB_RED);
        draw_key(K_RSHIFT, TB_WHITE, TB_RED);
    }

    struct combo *k = 0;
    if (ev->key >= TB_KEY_ARROW_RIGHT)
        k = &func_combos[0xFFFF-ev->key];
    else if (ev->ch < 128) {
        if (ev->ch == 0 && ev->key < 128)
            k = &combos[ev->key];
        else
            k = &combos[ev->ch];
    }
    if (!k)
        return;

    struct key **keys = k->keys;
    while (*keys) {
        draw_key(*keys, TB_WHITE, TB_RED);
        keys++;
    }
}

int main(int argc, char **argv)
{
    (void) argc; (void) argv;
    int ret;

    setlocale(LC_ALL, "");

    ret = tb_init();
    if (ret) {
        fprintf(stderr, "tb_init() failed with error code %d\n", ret);
        return 1;
    }

    tb_set_input_mode(TB_INPUT_ESC | TB_INPUT_MOUSE);
    struct tb_event ev;

    tb_clear();
    draw_keyboard();
    tb_present();
    int inputmode = 0;
    int ctrlxpressed = 0;

    while (1) {
        ret = tb_poll_event(&ev);

        if (ret != TB_OK) {
            if (ret == TB_ERR_POLL && tb_last_errno() == EINTR) {
                /* poll was interrupted, maybe by a SIGWINCH; try again */
                continue;
            }
            /* some other error occurred; bail */
            break;
        }

        switch (ev.type) {
        case TB_EVENT_KEY:
            if (ev.key == TB_KEY_CTRL_Q && ctrlxpressed) {
                tb_shutdown();
                return 0;
            }
            if (ev.key == TB_KEY_CTRL_C && ctrlxpressed) {
                static int chmap[] = {
                    TB_INPUT_ESC | TB_INPUT_MOUSE, /* 101 */
                    TB_INPUT_ALT | TB_INPUT_MOUSE, /* 110 */
                    TB_INPUT_ESC,                  /* 001 */
                    TB_INPUT_ALT,                  /* 010 */
                };
                inputmode++;
                if (inputmode >= 4) {
                    inputmode = 0;
                }
                tb_set_input_mode(chmap[inputmode]);
            }
            if (ev.key == TB_KEY_CTRL_X)
                ctrlxpressed = 1;
            else
                ctrlxpressed = 0;

            tb_clear();
            draw_keyboard();
            dispatch_press(&ev);
            pretty_print_press(&ev);
            tb_present();
            break;
        case TB_EVENT_RESIZE:
            tb_clear();
            draw_keyboard();
            pretty_print_resize(&ev);
            tb_present();
            break;
        case TB_EVENT_MOUSE:
            tb_clear();
            draw_keyboard();
            pretty_print_mouse(&ev);
            tb_present();
            break;
        default:
            break;
        }
    }
    tb_shutdown();
    return 0;
}
