/**
 * @file    u8g_fontutf8.cpp
 * @brief   font api for u8g lib
 * @author  Yunhui Fu (yhfudev@gmail.com)
 * @version 1.0
 * @date    2015-02-19
 * @copyright GPL/BSD
 */

#include "../../inc/MarlinConfigPre.h"

#if HAS_MARLINUI_U8GLIB

#include <string.h>
#include "../fontutils.h"
#include "u8g_fontutf8.h"

typedef void font_t;

/**
 * @brief the callback function to draw something
 *
 * @param userdata : User's data
 * @param msg : the u8g's string
 * @param fnt_current : the font
 *
 * @return 0 on success, 1 to force quit, <0 on error
 *
 * Get the screen pixel width of a ROM UTF-8 string
 */
typedef int (* fontgroup_cb_draw_t)(void *userdata, const font_t *fnt_current, const char *msg);

/* return v1 - v2 */
static int fontinfo_compare(uxg_fontinfo_t * v1, uxg_fontinfo_t * v2) {
  if (v1->page < v2->page)      return -1;
  else if (v1->page > v2->page) return 1;

  if (v1->end < v2->begin)      return -1;
  else if (v1->begin > v2->end) return 1;

  return 0;
}

/*"data_list[idx] - *data_pin"*/
static int pf_bsearch_cb_comp_fntifo_pgm (void *userdata, size_t idx, void *data_pin) {
  uxg_fontinfo_t *fntinfo = (uxg_fontinfo_t*)userdata;
  uxg_fontinfo_t localval;
  memcpy_P(&localval, fntinfo + idx, sizeof(localval));
  return fontinfo_compare(&localval, (uxg_fontinfo_t*)data_pin);
}

typedef struct _font_group_t {
  const uxg_fontinfo_t * m_fntifo;
  int m_fntinfo_num;
} font_group_t;

static int fontgroup_init(font_group_t * root, const uxg_fontinfo_t * fntinfo, int number) {
  root->m_fntifo = fntinfo;
  root->m_fntinfo_num = number;
  return 0;
}

static const font_t* fontgroup_find(font_group_t * root, const lchar_t &val) {
  if (val <= 0xFF) return nullptr;

  uxg_fontinfo_t vcmp = { uint16_t(val >> 7), uint8_t((val & 0x7F) + 0x80), uint8_t((val & 0x7F) + 0x80), 0, 0 };
  size_t idx = 0;

  if (pf_bsearch_r((void*)root->m_fntifo, root->m_fntinfo_num, pf_bsearch_cb_comp_fntifo_pgm, (void*)&vcmp, &idx) < 0)
    return nullptr;

  memcpy_P(&vcmp, root->m_fntifo + idx, sizeof(vcmp));
  return vcmp.fntdata;
}

static void fontgroup_drawwchar(font_group_t *group, const font_t *fnt_default, const lchar_t &val, void * userdata, fontgroup_cb_draw_t cb_draw_ram) {
  uint8_t buf[2] = {0, 0};
  const font_t * fntpqm = (font_t*)fontgroup_find(group, val);
  if (!fntpqm) {
    // Unknown char, use default font
    buf[0] = (uint8_t)(val & 0xFF);
    fntpqm = fnt_default;
  }
  if (fnt_default != fntpqm) {
    buf[0] = (uint8_t)(val & 0x7F);
    buf[0] |= 0x80; // use upper page to avoid 0x00 error in C. you may want to generate the font data
  }

  cb_draw_ram (userdata, fntpqm, (char*) buf);
}

/**
 * @brief try to process a utf8 string
 *
 * @param pu8g : U8G pointer
 * @param fnt_default : the default font
 * @param utf8_msg : the UTF-8 string
 * @param cb_read_byte : how to read the utf8_msg, from RAM or ROM (call read_byte_ram or pgm_read_byte)
 * @param userdata : User's data
 * @param cb_draw_ram : the callback function of userdata to draw a !RAM! string (actually it is to draw a one byte string in RAM)
 *
 * @return N/A
 *
 * Get the screen pixel width of a ROM UTF-8 string
 */
static void fontgroup_drawstring(font_group_t *group, const font_t *fnt_default, const char *utf8_msg, read_byte_cb_t cb_read_byte, void * userdata, fontgroup_cb_draw_t cb_draw_ram) {
  const uint8_t *p = (uint8_t*)utf8_msg;
  for (;;) {
    lchar_t wc;
    p = get_utf8_value_cb(p, cb_read_byte, wc);
    if (!wc) break;
    fontgroup_drawwchar(group, fnt_default, wc, userdata, cb_draw_ram);
  }
}

static bool flag_fontgroup_was_inited = false;
static font_group_t g_fontgroup_root = { nullptr, 0 };

/**
 * @brief check if font is loaded
 */
static inline bool uxg_Utf8FontIsInited() { return flag_fontgroup_was_inited; }

int uxg_SetUtf8Fonts (const uxg_fontinfo_t * fntinfo, int number) {
  flag_fontgroup_was_inited = 1;
  return fontgroup_init(&g_fontgroup_root, fntinfo, number);
}

struct _uxg_drawu8_data_t {
  u8g_t *pu8g;
  unsigned int x;
  unsigned int y;
  unsigned int adv;
  unsigned int max_width; // the max pixel width of the string allowed
  const void * fnt_prev;
};

static int fontgroup_cb_draw_u8g(void *userdata, const font_t *fnt_current, const char *msg) {
  struct _uxg_drawu8_data_t * pdata = (_uxg_drawu8_data_t*)userdata;

  if (pdata->fnt_prev != fnt_current) {
    u8g_SetFont(pdata->pu8g, (const u8g_fntpgm_uint8_t*)fnt_current);
    pdata->fnt_prev = fnt_current;
  }
  if ((pdata->max_width != PIXEL_LEN_NOLIMIT) && (pdata->adv + u8g_GetStrPixelWidth(pdata->pu8g, (char*)msg) > pdata->max_width))
    return 1;
  pdata->adv += u8g_DrawStr(pdata->pu8g, pdata->x + pdata->adv, pdata->y, (char*) msg);
  return 0;
}

/**
 * @brief Draw a lchar_t at the specified position
 *
 * @param pu8g : U8G pointer
 * @param x : position x axis
 * @param y : position y axis
 * @param wc : the lchar_t
 * @param max_width : the pixel width of the string allowed
 *
 * @return number of pixels advanced
 *
 * Draw a UTF-8 string at the specified position
 */
unsigned int uxg_DrawLchar(u8g_t *pu8g, unsigned int x, unsigned int y, const lchar_t &wc, pixel_len_t max_width) {
  struct _uxg_drawu8_data_t data;
  font_group_t *group = &g_fontgroup_root;
  const font_t *fnt_default = uxg_GetFont(pu8g);

  if (!uxg_Utf8FontIsInited()) {
    u8g_DrawStrP(pu8g, x, y, (const u8g_pgm_uint8_t *)PSTR("Err: utf8 font not initialized."));
    return 0;
  }
  data.pu8g = pu8g;
  data.x = x;
  data.y = y;
  data.adv = 0;
  data.max_width = max_width;
  data.fnt_prev = nullptr;
  fontgroup_drawwchar(group, fnt_default, wc, (void*)&data, fontgroup_cb_draw_u8g);
  u8g_SetFont(pu8g, (const u8g_fntpgm_uint8_t*)fnt_default);

  return data.adv;
}

/**
 * @brief Draw a UTF-8 string at the specified position
 *
 * @param pu8g : U8G pointer
 * @param x : position x axis
 * @param y : position y axis
 * @param utf8_msg : the UTF-8 string
 * @param max_width : the pixel width of the string allowed
 *
 * @return number of pixels advanced
 *
 * Draw a UTF-8 string at the specified position
 */
unsigned int uxg_DrawUtf8Str(u8g_t *pu8g, unsigned int x, unsigned int y, const char *utf8_msg, pixel_len_t max_width) {
  struct _uxg_drawu8_data_t data;
  font_group_t *group = &g_fontgroup_root;
  const font_t *fnt_default = uxg_GetFont(pu8g);

  if (!uxg_Utf8FontIsInited()) {
    u8g_DrawStrP(pu8g, x, y, (const u8g_pgm_uint8_t *)PSTR("Err: utf8 font not initialized."));
    return 0;
  }
  data.pu8g = pu8g;
  data.x = x;
  data.y = y;
  data.adv = 0;
  data.max_width = max_width;
  data.fnt_prev = nullptr;
  fontgroup_drawstring(group, fnt_default, utf8_msg, read_byte_ram, (void*)&data, fontgroup_cb_draw_u8g);
  u8g_SetFont(pu8g, (const u8g_fntpgm_uint8_t*)fnt_default);

  return data.adv;
}

/**
 * @brief Draw a ROM UTF-8 string at the specified position
 *
 * @param pu8g : U8G pointer
 * @param x : position x axis
 * @param y : position y axis
 * @param utf8_msg : the UTF-8 string
 * @param max_width : the pixel width of the string allowed
 *
 * @return number of pixels advanced
 *
 * Draw a ROM UTF-8 string at the specified position
 */
unsigned int uxg_DrawUtf8StrP(u8g_t *pu8g, unsigned int x, unsigned int y, PGM_P utf8_msg, pixel_len_t max_width) {
  struct _uxg_drawu8_data_t data;
  font_group_t *group = &g_fontgroup_root;
  const font_t *fnt_default = uxg_GetFont(pu8g);

  if (!uxg_Utf8FontIsInited()) {
    u8g_DrawStrP(pu8g, x, y, (const u8g_pgm_uint8_t *)PSTR("Err: utf8 font not initialized."));
    return 0;
  }
  data.pu8g = pu8g;
  data.x = x;
  data.y = y;
  data.adv = 0;
  data.max_width = max_width;
  data.fnt_prev = nullptr;
  fontgroup_drawstring(group, fnt_default, utf8_msg, read_byte_rom, (void*)&data, fontgroup_cb_draw_u8g);
  u8g_SetFont(pu8g, (const u8g_fntpgm_uint8_t*)fnt_default);

  return data.adv;
}

static int fontgroup_cb_draw_u8gstrlen(void *userdata, const font_t *fnt_current, const char *msg) {
  struct _uxg_drawu8_data_t * pdata = (_uxg_drawu8_data_t*)userdata;

  if (pdata->fnt_prev != fnt_current) {
    u8g_SetFont(pdata->pu8g, (const u8g_fntpgm_uint8_t*)fnt_current);
    pdata->fnt_prev = fnt_current;
  }
  pdata->adv += u8g_GetStrPixelWidth(pdata->pu8g, (char*)msg);
  return 0;
}

/**
 * @brief Get the screen pixel width of a UTF-8 string
 *
 * @param pu8g : U8G pointer
 * @param utf8_msg : the UTF-8 string
 *
 * @return the pixel width
 *
 * Get the screen pixel width of a UTF-8 string
 */
int uxg_GetUtf8StrPixelWidth(u8g_t *pu8g, const char *utf8_msg) {
  struct _uxg_drawu8_data_t data;
  font_group_t *group = &g_fontgroup_root;
  const font_t *fnt_default = uxg_GetFont(pu8g);

  if (!uxg_Utf8FontIsInited()) return -1;

  memset(&data, 0, sizeof(data));
  data.pu8g = pu8g;
  data.adv = 0;
  fontgroup_drawstring(group, fnt_default, utf8_msg, read_byte_ram, (void*)&data, fontgroup_cb_draw_u8gstrlen);
  u8g_SetFont(pu8g, (const u8g_fntpgm_uint8_t*)fnt_default);

  return data.adv;
}

/**
 * @brief Get the screen pixel width of a ROM UTF-8 string
 *
 * @param pu8g : U8G pointer
 * @param utf8_msg : the UTF-8 string
 *
 * @return the pixel width
 *
 * Get the screen pixel width of a ROM UTF-8 string
 */
int uxg_GetUtf8StrPixelWidthP(u8g_t *pu8g, PGM_P utf8_msg) {
  struct _uxg_drawu8_data_t data;
  font_group_t *group = &g_fontgroup_root;
  const font_t *fnt_default = uxg_GetFont(pu8g);

  if (!uxg_Utf8FontIsInited()) return -1;

  memset(&data, 0, sizeof(data));
  data.pu8g = pu8g;
  data.adv = 0;
  fontgroup_drawstring(group, fnt_default, utf8_msg, read_byte_rom, (void*)&data, fontgroup_cb_draw_u8gstrlen);
  u8g_SetFont(pu8g, (const u8g_fntpgm_uint8_t*)fnt_default);
  return data.adv;
}

#endif // HAS_MARLINUI_U8GLIB
