#ifndef UI_H
#define UI_H

#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <string.h>
#include <sys/types.h>

#define UI_CHECK_EOFDS

/*=== forward declarations ===*/
typedef struct ui_struct ui_t;
typedef struct uif_struct uif_t;


/*=== struct declarations === */

typedef uint8_t (*uif_cb)(ui_t *ui, uint8_t msg);

struct uif_struct
{
  uint8_t id0;
  uint8_t id1;
  uint8_t cflags;             // config flags e.g. UIF_CFLAG_IS_CURSOR_SELECTABLE, if so, then it will not receive any cursor/touch msgs
  uint8_t extra;
  void *data;                           // might be a pointer to a variable
  uif_cb cb;                        // callback
};

#define UIF(id,cflags,data,cb) { id[0], id[1], cflags, 0, data, cb}

#define uif_get_id0(uif) ((uif)->id0)
#define uif_get_id1(uif) ((uif)->id1)
#define uif_get_cflags(uif) ((uif)->cflags)
#define uif_get_extra(uif) ((uif)->extra)
#define uif_get_data(uif) ((uif)->data)
#define uif_get_cb(uif) ((uif)->cb)

#define UIF_MSG_NONE 0
#define UIF_MSG_DRAW 1
#define UIF_MSG_FORM_START 2
#define UIF_MSG_FORM_END 3
#define UIF_MSG_CURSOR_ENTER 4
#define UIF_MSG_CURSOR_SELECT 5
#define UIF_MSG_CURSOR_LEAVE 6
#define UIF_MSG_TOUCH_DOWN 7
#define UIF_MSG_TOUCH_UP 8


/* dynamic flags */
#define UIF_DFLAG_IS_CURSOR_FOCUS 0x01
#define UIF_DFLAG_IS_TOUCH_FOCUS 0x02
  
/* config flags */
#define UIF_CFLAG_IS_CURSOR_SELECTABLE 0x01
#define UIF_CFLAG_IS_TOUCH_SELECTABLE 0x02

typedef const char *fds_t;      // form/field definition string


/* must be smaller than or equal to 255 */
#define UI_MAX_TEXT_LEN 31

struct ui_struct
{
  void *graphics_data;
  fds_t root_fds;  
  
  uif_t *uif_list;
  size_t uif_cnt;
  
  fds_t current_form_fds;         // the current form
  fds_t cursor_focus_fds;           // the element which has the current cursor focus
  fds_t touch_focus_fds;            // the element which has touch focus
  

  fds_t token;             // current token position
  
  /* current field/style variables */
  uint8_t delimiter;    // outer delimiter of the text part of a field
  uint8_t cmd;          // current cmd or field (e.g. U or F)
  uint8_t id0;
  uint8_t id1;
  uint8_t x;
  uint8_t y;
  uint8_t dflags;
  ssize_t len;          // length of the current command
  fds_t fds;             // current position, *fds = cmd
  uif_t *uif;                   // user interface field or style for the given id0 / id1
  char text[UI_MAX_TEXT_LEN+1];

  /* target  */
  fds_t tmp_fds;
  fds_t target_fds;
};



/*=== form string definitions ===*/

#define UI_0 "\x00"
#define UI_1 "\x01"
#define UI_2 "\x02"
#define UI_3 "\x03"
#define UI_4 "\x04"
#define UI_5 "\x05"
#define UI_6 "\x06"
#define UI_7 "\x07"
#define UI_8 "\x08"
#define UI_9 "\x09"
#define UI_10 "\x0a"
#define UI_11 "\x0b"
#define UI_12 "\x0c"
#define UI_13 "\x0d"
#define UI_14 "\x0e"
#define UI_15 "\x0f"
#define UI_16 "\x10"
#define UI_17 "\x11"
#define UI_18 "\x12"
#define UI_19 "\x13"
#define UI_20 "\x14"
#define UI_21 "\x15"
#define UI_22 "\x16"
#define UI_23 "\x17"
#define UI_24 "\x18"
#define UI_25 "\x19"
#define UI_26 "\x1a"
#define UI_27 "\x1b"
#define UI_28 "\x1c"
#define UI_29 "\x1d"
#define UI_30 "\x1e"
#define UI_31 "\x1f"
#define UI_32 "\x20"
#define UI_33 "\x21"
#define UI_34 "\x22"
#define UI_35 "\x23"
#define UI_36 "\x24"
#define UI_37 "\x25"
#define UI_38 "\x26"
#define UI_39 "\x27"
#define UI_40 "\x28"
#define UI_41 "\x29"
#define UI_42 "\x2a"
#define UI_43 "\x2b"
#define UI_44 "\x2c"
#define UI_45 "\x2d"
#define UI_46 "\x2e"
#define UI_47 "\x2f"
#define UI_48 "\x30"
#define UI_49 "\x31"
#define UI_50 "\x32"
#define UI_51 "\x33"
#define UI_52 "\x34"
#define UI_53 "\x35"
#define UI_54 "\x36"
#define UI_55 "\x37"
#define UI_56 "\x38"
#define UI_57 "\x39"
#define UI_58 "\x3a"
#define UI_59 "\x3b"
#define UI_60 "\x3c"
#define UI_61 "\x3d"
#define UI_62 "\x3e"
#define UI_63 "\x3f"
#define UI_64 "\x40"
#define UI_65 "\x41"
#define UI_66 "\x42"
#define UI_67 "\x43"
#define UI_68 "\x44"
#define UI_69 "\x45"
#define UI_70 "\x46"
#define UI_71 "\x47"
#define UI_72 "\x48"
#define UI_73 "\x49"
#define UI_74 "\x4a"
#define UI_75 "\x4b"
#define UI_76 "\x4c"
#define UI_77 "\x4d"
#define UI_78 "\x4e"
#define UI_79 "\x4f"
#define UI_80 "\x50"
#define UI_81 "\x51"
#define UI_82 "\x52"
#define UI_83 "\x53"
#define UI_84 "\x54"
#define UI_85 "\x55"
#define UI_86 "\x56"
#define UI_87 "\x57"
#define UI_88 "\x58"
#define UI_89 "\x59"
#define UI_90 "\x5a"
#define UI_91 "\x5b"
#define UI_92 "\x5c"
#define UI_93 "\x5d"
#define UI_94 "\x5e"
#define UI_95 "\x5f"
#define UI_96 "\x60"
#define UI_97 "\x61"
#define UI_98 "\x62"
#define UI_99 "\x63"
#define UI_100 "\x64"
#define UI_101 "\x65"
#define UI_102 "\x66"
#define UI_103 "\x67"
#define UI_104 "\x68"
#define UI_105 "\x69"
#define UI_106 "\x6a"
#define UI_107 "\x6b"
#define UI_108 "\x6c"
#define UI_109 "\x6d"
#define UI_110 "\x6e"
#define UI_111 "\x6f"
#define UI_112 "\x70"
#define UI_113 "\x71"
#define UI_114 "\x72"
#define UI_115 "\x73"
#define UI_116 "\x74"
#define UI_117 "\x75"
#define UI_118 "\x76"
#define UI_119 "\x77"
#define UI_120 "\x78"
#define UI_121 "\x79"
#define UI_122 "\x7a"
#define UI_123 "\x7b"
#define UI_124 "\x7c"
#define UI_125 "\x7d"
#define UI_126 "\x7e"
#define UI_127 "\x7f"
#define UI_128 "\x80"
#define UI_129 "\x81"
#define UI_130 "\x82"
#define UI_131 "\x83"
#define UI_132 "\x84"
#define UI_133 "\x85"
#define UI_134 "\x86"
#define UI_135 "\x87"
#define UI_136 "\x88"
#define UI_137 "\x89"
#define UI_138 "\x8a"
#define UI_139 "\x8b"
#define UI_140 "\x8c"
#define UI_141 "\x8d"
#define UI_142 "\x8e"
#define UI_143 "\x8f"
#define UI_144 "\x90"
#define UI_145 "\x91"
#define UI_146 "\x92"
#define UI_147 "\x93"
#define UI_148 "\x94"
#define UI_149 "\x95"
#define UI_150 "\x96"
#define UI_151 "\x97"
#define UI_152 "\x98"
#define UI_153 "\x99"
#define UI_154 "\x9a"
#define UI_155 "\x9b"
#define UI_156 "\x9c"
#define UI_157 "\x9d"
#define UI_158 "\x9e"
#define UI_159 "\x9f"
#define UI_160 "\xa0"
#define UI_161 "\xa1"
#define UI_162 "\xa2"
#define UI_163 "\xa3"
#define UI_164 "\xa4"
#define UI_165 "\xa5"
#define UI_166 "\xa6"
#define UI_167 "\xa7"
#define UI_168 "\xa8"
#define UI_169 "\xa9"
#define UI_170 "\xaa"
#define UI_171 "\xab"
#define UI_172 "\xac"
#define UI_173 "\xad"
#define UI_174 "\xae"
#define UI_175 "\xaf"
#define UI_176 "\xb0"
#define UI_177 "\xb1"
#define UI_178 "\xb2"
#define UI_179 "\xb3"
#define UI_180 "\xb4"
#define UI_181 "\xb5"
#define UI_182 "\xb6"
#define UI_183 "\xb7"
#define UI_184 "\xb8"
#define UI_185 "\xb9"
#define UI_186 "\xba"
#define UI_187 "\xbb"
#define UI_188 "\xbc"
#define UI_189 "\xbd"
#define UI_190 "\xbe"
#define UI_191 "\xbf"
#define UI_192 "\xc0"
#define UI_193 "\xc1"
#define UI_194 "\xc2"
#define UI_195 "\xc3"
#define UI_196 "\xc4"
#define UI_197 "\xc5"
#define UI_198 "\xc6"
#define UI_199 "\xc7"
#define UI_200 "\xc8"
#define UI_201 "\xc9"
#define UI_202 "\xca"
#define UI_203 "\xcb"
#define UI_204 "\xcc"
#define UI_205 "\xcd"
#define UI_206 "\xce"
#define UI_207 "\xcf"
#define UI_208 "\xd0"
#define UI_209 "\xd1"
#define UI_210 "\xd2"
#define UI_211 "\xd3"
#define UI_212 "\xd4"
#define UI_213 "\xd5"
#define UI_214 "\xd6"
#define UI_215 "\xd7"
#define UI_216 "\xd8"
#define UI_217 "\xd9"
#define UI_218 "\xda"
#define UI_219 "\xdb"
#define UI_220 "\xdc"
#define UI_221 "\xdd"
#define UI_222 "\xde"
#define UI_223 "\xdf"
#define UI_224 "\xe0"
#define UI_225 "\xe1"
#define UI_226 "\xe2"
#define UI_227 "\xe3"
#define UI_228 "\xe4"
#define UI_229 "\xe5"
#define UI_230 "\xe6"
#define UI_231 "\xe7"
#define UI_232 "\xe8"
#define UI_233 "\xe9"
#define UI_234 "\xea"
#define UI_235 "\xeb"
#define UI_236 "\xec"
#define UI_237 "\xed"
#define UI_238 "\xee"
#define UI_239 "\xef"
#define UI_240 "\xf0"
#define UI_241 "\xf1"
#define UI_242 "\xf2"
#define UI_243 "\xf3"
#define UI_244 "\xf4"
#define UI_245 "\xf5"
#define UI_246 "\xf6"
#define UI_247 "\xf7"
#define UI_248 "\xf8"
#define UI_249 "\xf9"
#define UI_250 "\xfa"
#define UI_251 "\xfb"
#define UI_252 "\xfc"
#define UI_253 "\xfd"
#define UI_254 "\xfe"
#define UI_255 "\xff"

/* form: one id only */
#define UI_FORM(id) "U" id
#define UI_LABEL(x,y,text) "L" UI_##x UI_##y "\xff" text "\xff"
#define UI_FIELD(id, x,y) "F" id UI_##x UI_##y
/* button id must be two chars, but must be unique everywhere */
#define UI_BUTTON(id, x,y, text) "B" id UI_##x UI_##y  "\xff" text "\xff"


uint8_t ui_fds_first_token(ui_t *ui);
uint8_t ui_fds_next_token(ui_t *ui);
uint8_t ui_fds_get_nth_token(ui_t *ui, uint8_t n);
uint8_t ui_fds_get_token_cnt(ui_t *ui);


void ui_Init(ui_t *ui, fds_t fds, uif_t *uif_list, size_t uif_cnt);
void ui_Draw(ui_t *ui);
void ui_EnterForm(ui_t *ui);
void ui_LeaveForm(ui_t *ui);
void ui_NextField(ui_t *ui);
void ui_PrevField(ui_t *ui);
void ui_SendSelect(ui_t *ui);

#endif /* UI_H */