/* -*- c-basic-offset:2; tab-width:2; indent-tabs-mode:nil -*- */

#ifdef BUILTIN_IMAGELIB

#include <strings.h> /* strcasecmp */
#include <pobl/bl_util.h> /* DIGIT_STR_LEN */
#include <pobl/bl_mem.h>  /* alloca */
#include <pobl/bl_path.h> /* BL_LIBEXECDIR (for registobmp) */

#include "c_sixel.c"
#include "c_regis.c"
#include "c_animgif.c"

/* --- static functions --- */

#ifdef GDK_PIXBUF_VERSION

#include <pobl/bl_conf_io.h> /* bl_get_user_rc_path */

#ifdef USE_FREETYPE_EMOJI
#include <ft2build.h>
#include FT_FREETYPE_H

#ifdef FT_LOAD_COLOR
static FT_Library library;

static void pixbuf_destroy_notify_emoji(guchar *pixels, gpointer data) {
  FT_Done_Face(data); /* free pixels */
#if 0
  FT_Done_FreeType(library);
  library = NULL;
#endif
}

static char *is_otf_emoji(char *path) {
  char *p;

  while ((p = strchr(path, '.'))) {
    if (((p[1] | 0x20) == 't' || (p[1] | 0x20) == 'o') &&
        (p[2] | 0x20) == 't' &&
        ((p[3] | 0x20) == 'f' || (p[3] | 0x20) == 'c') &&
        p[4] == '/') {
      p[4] = '\0';

      return p + 5;
    }
    path = p + 1;
  }

  return NULL;
}

static GdkPixbuf *gdk_pixbuf_new_from_otf(const char *path) {
  char *p;
  FT_Face face;
  u_int code;
  FT_UInt idx;
  int x;
  int y;
  unsigned char *buffer;
  GdkPixbuf *pixbuf = NULL;

  /* path is always changeable (see ui_emoji.c) */
  if (!(p = is_otf_emoji((char*)path))) {
    return NULL;
  }

  if (sscanf(p, "%x", &code) != 1 || code == 0) {
    return NULL;
  }

  if (library == NULL && FT_Init_FreeType(&library)) {
    return NULL;
  }

  if (FT_New_Face(library, path, 0, &face)) {
    goto end1;
  }

  if ((idx = FT_Get_Char_Index(face, code)) == 0) {
    goto end2;
  }

  if (face->num_fixed_sizes > 0) {
    int nearest = 0;
#if 0
    u_int32_t min_diff = 0xffffffff;
    u_int32_t diff;
    int count;
    for (count = 0; count < face->num_fixed_sizes; count++) {
      diff = abs(font_width - face->available_sizes[0].width);
      if (min_diff > diff) {
        min_diff = diff;
        nearest = count;
      }
    }
#endif

    FT_Select_Size(face, nearest);
  }

  FT_Load_Glyph(face, idx, FT_LOAD_DEFAULT|FT_LOAD_COLOR);
#if 0
  FT_Render_Glyph(face->glyph, FT_RENDER_MODE_LCD);
#endif
#ifdef DEBUG
  bl_debug_printf("%s emoji: code %x idx %x w %d(%d bytes) h %d\n", path, code, idx,
                  face->glyph->bitmap.width, face->glyph->bitmap.pitch, face->glyph->bitmap.rows);
#endif

  if (face->glyph->format != FT_GLYPH_FORMAT_BITMAP ||
      face->glyph->bitmap.pixel_mode != FT_PIXEL_MODE_BGRA) {
    goto end2;
  }

  buffer = face->glyph->bitmap.buffer;

  for (y = 0; y < face->glyph->bitmap.rows; y++) {
    for (x = 0; x < face->glyph->bitmap.pitch; x += 4) {
      /* BGRA => RGBA */
      unsigned char tmp = buffer[x];
      buffer[x] = buffer[x + 2];
      buffer[x + 2] = tmp;
    }
    buffer += face->glyph->bitmap.pitch;
  }

  return gdk_pixbuf_new_from_data(face->glyph->bitmap.buffer,
                                  GDK_COLORSPACE_RGB, TRUE, 8, face->glyph->bitmap.width,
                                  face->glyph->bitmap.rows, face->glyph->bitmap.pitch,
                                  pixbuf_destroy_notify_emoji, face);

end2:
  FT_Done_Face(face);

end1:
#if 0
  FT_Done_FreeType(library);
#endif

  return pixbuf;
}
#else
#define gdk_pixbuf_new_from_otf(path) (NULL)
#endif
#else
#define gdk_pixbuf_new_from_otf(path) (NULL)
#endif

static void pixbuf_destroy_notify(guchar *pixels, gpointer data) { free(pixels); }

static GdkPixbuf *gdk_pixbuf_new_from_sixel(const char *path) {
  u_char *pixels;
  u_int width;
  u_int height;

  if (!(pixels = load_sixel_from_file(path, &width, &height, NULL))) {
    return NULL;
  }

  /* load_sixel_from_file returns 4 bytes per pixel data. */
  return gdk_pixbuf_new_from_data(pixels, GDK_COLORSPACE_RGB, TRUE, 8, width, height, width * 4,
                                  pixbuf_destroy_notify, NULL);
}

#define create_cardinals_from_sixel(path, width, height) (NULL)

/* create an CARDINAL array for_NET_WM_ICON data */
static u_int32_t *create_cardinals_from_pixbuf(GdkPixbuf *pixbuf) {
  u_int width;
  u_int height;
  u_int32_t *cardinal;
  int rowstride;
  u_char *line;
  u_char *pixel;
  u_int i, j;

  width = gdk_pixbuf_get_width(pixbuf);
  height = gdk_pixbuf_get_height(pixbuf);

  if (width > ((SSIZE_MAX / sizeof(*cardinal)) - 2) / height || /* integer overflow */
      !(cardinal = malloc((width * height + 2) * sizeof(*cardinal)))) {
    return NULL;
  }

  rowstride = gdk_pixbuf_get_rowstride(pixbuf);
  line = gdk_pixbuf_get_pixels(pixbuf);

  /* format of the array is {width, height, ARGB[][]} */
  cardinal[0] = width;
  cardinal[1] = height;
  if (gdk_pixbuf_get_has_alpha(pixbuf)) {
    for (i = 0; i < height; i++) {
      pixel = line;
      line += rowstride;
      for (j = 0; j < width; j++) {
        /* RGBA to ARGB */
        cardinal[(i * width + j) + 2] =
            ((((((u_int32_t)(pixel[3]) << 8) + pixel[0]) << 8) + pixel[1]) << 8) + pixel[2];
        pixel += 4;
      }
    }
  } else {
    for (i = 0; i < height; i++) {
      pixel = line;
      line += rowstride;
      for (j = 0; j < width; j++) {
        /* all pixels are completely opaque (0xFF) */
        cardinal[(i * width + j) + 2] =
            ((((((u_int32_t)(0x0000FF) << 8) + pixel[0]) << 8) + pixel[1]) << 8) + pixel[2];
        pixel += 3;
      }
    }
  }

  return cardinal;
}

static GdkPixbuf *gdk_pixbuf_new_from(const char *path) {
  GdkPixbuf *pixbuf;

  if (!(pixbuf = gdk_pixbuf_new_from_otf(path)) &&
      (strcasecmp(path + strlen(path) - 4, ".six") != 0 ||
       !(pixbuf = gdk_pixbuf_new_from_sixel(path)))) {
    if (strcasecmp(path + strlen(path) - 4, ".gif") == 0 && !strstr(path, "mlterm/anim")) {
      /* Animation GIF */

      char *dir;

      if ((dir = bl_get_user_rc_path("mlterm/"))) {
        int hash;

        hash = hash_path(path);

        if (strstr(path, "://")) {
          char *cmd;

          if (!(cmd = alloca(25 + strlen(path) + strlen(dir) + 5 + DIGIT_STR_LEN(int)+1))) {
            goto end;
          }

          sprintf(cmd, "curl -L -k -s %s > %sanim%d.gif", path, dir, hash);
          if (system(cmd) != 0) {
            goto end;
          }

          path = cmd + 14 + strlen(path) + 3;
        }

        split_animation_gif(path, dir, hash);

      end:
        free(dir);
      }
    }

#if GDK_PIXBUF_MAJOR >= 2
    if (strstr(path, "://")) {
#ifdef __G_IO_H__
      /*
       * gdk-pixbuf depends on gio. (__G_IO_H__ is defined if
       * gdk-pixbuf-core.h includes gio.h)
       */
      GFile *file;
      GInputStream *in;

      if ((in = (GInputStream*)g_file_read(
               (file = g_vfs_get_file_for_uri(g_vfs_get_default(), path)), NULL, NULL))) {
        pixbuf = gdk_pixbuf_new_from_stream(in, NULL, NULL);
        g_object_unref(in);
      } else
#endif
      {
        char *cmd;

        pixbuf = NULL;

        if ((cmd = alloca(11 + strlen(path) + 1))) {
          FILE* fp;

          sprintf(cmd, "curl -L -k -s %s", path);
          if ((fp = popen(cmd, "r"))) {
            GdkPixbufLoader *loader;
            guchar buf[65536];
            size_t len;

            loader = gdk_pixbuf_loader_new();
            while ((len = fread(buf, 1, sizeof(buf), fp)) > 0) {
              gdk_pixbuf_loader_write(loader, buf, len, NULL);
            }
            gdk_pixbuf_loader_close(loader, NULL);

            pclose(fp);

            if ((pixbuf = gdk_pixbuf_loader_get_pixbuf(loader))) {
              g_object_ref(pixbuf);
            }

            g_object_unref(loader);
          }
        }
      }

#ifdef __G_IO_H__
      g_object_unref(file);
#endif
    } else
#endif /* GDK_PIXBUF_MAJOR */
    {
      if (strcasecmp(path + strlen(path) - 4, ".rgs") == 0) {
        char *new_path;

        if ((new_path = alloca(strlen(path) + 1)) &&
            convert_regis_to_bmp(strcpy(new_path, path))) {
          path = new_path;
        }
      }

#if GDK_PIXBUF_MAJOR >= 2
      pixbuf = gdk_pixbuf_new_from_file(path, NULL);
#else
      pixbuf = gdk_pixbuf_new_from_file(path);
#endif

      if (strstr(path, "mlterm/anim")) {
        int xoff;
        int yoff;
        int width;
        int height;

        if (read_gif_info(path, &xoff, &yoff, &width, &height)) {
          if (width > gdk_pixbuf_get_width(pixbuf) || height > gdk_pixbuf_get_height(pixbuf)) {
            GdkPixbuf *new_pixbuf;

            new_pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, width, height);
            gdk_pixbuf_fill(new_pixbuf, 0x00000000);
            gdk_pixbuf_copy_area(pixbuf, 0, 0, gdk_pixbuf_get_width(pixbuf),
                                 gdk_pixbuf_get_height(pixbuf), new_pixbuf, xoff, yoff);
            g_object_unref(pixbuf);
            pixbuf = new_pixbuf;
          }
        }
      }
    }
  }

  return pixbuf;
}

#else /* GDK_PIXBUF_VERSION */

#define gdk_pixbuf_new_from_sixel(path) (NULL)

static u_int32_t *create_cardinals_from_sixel(const char *path) {
  u_int width;
  u_int height;
  u_int32_t *cardinal;

  if (!(cardinal = (u_int32_t*)load_sixel_from_file(path, &width, &height, NULL))) {
    return NULL;
  }

  cardinal -= 2;

  cardinal[0] = width;
  cardinal[1] = height;

  return cardinal;
}

#endif /* GDK_PIXBUF_VERSION */

#endif /* BUILTIN_IMAGELIB */

#ifdef USE_XLIB

/* seek the closest color */
static int closest_color_index(XColor *color_list, int len, int red, int green, int blue) {
  int closest = 0;
  int i;
  u_int min = 0xffffff;
  u_int diff;
  int diff_r, diff_g, diff_b;

  for (i = 0; i < len; i++) {
    /* lazy color-space conversion*/
    diff_r = red - (color_list[i].red >> 8);
    diff_g = green - (color_list[i].green >> 8);
    diff_b = blue - (color_list[i].blue >> 8);
    diff = diff_r * diff_r * 9 + diff_g * diff_g * 30 + diff_b * diff_b;
    if (diff < min) {
      min = diff;
      closest = i;
      /* no one may notice the difference (4[2^3/2]*4*9+4*4*30+4*4) */
      if (diff < 640) {
        break;
      }
    }
  }

  return closest;
}

/**Return position of the least significant bit
 *
 *\param val value to count
 *
 */
static int lsb(u_int val) {
  int nth = 0;

  if (val == 0) {
    return 0;
  }

  while ((val & 1) == 0) {
    val = val >> 1;
    nth++;
  }

  return nth;
}

/**Return  position of the most significant bit
 *
 *\param val value to count
 *
 */
static int msb(u_int val) {
  int nth;

  if (val == 0) {
    return 0;
  }

  nth = lsb(val) + 1;

  while (val & (1 << nth)) {
    nth++;
  }

  return nth;
}

#endif /* USE_XLIB */
