/* main.c

Copyright (C) 1999,2000 Tom Gilbert.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to
deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies of the Software and its documentation and acknowledgment shall be
given in the documentation and software packages that this Software was
used.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

#include "gozer.h"
#include "options.h"

int
main(int argc, char **argv)
{
   Imlib_Font fn;
   Imlib_Image image, bg_image = NULL;
   Imlib_Load_Error err;
   gib_list *lines, *l, *ll, *words;
   int w = 0, h = 0, ww, hh, x = 0, y = 0, bgw = 0, bgh = 0;
   DATA8 atab[256];
   gib_style *style = NULL;
   char *p, *pp;

   init_parse_options(argc, argv);

   init_imlib();

   if (!opt.output_file)
   {
      weprintf("no output file specified");
      show_mini_usage();
   }
   if (!opt.text && opt.textfile)
      opt.text = gozer_read_file(opt.textfile);

   if (!opt.text && opt.pipe)
   {
      opt.text = gozer_read_pipe();
   }

   if (!opt.text)
   {
      weprintf("no text specified for rendering");
      show_mini_usage();
   }

   fn = imlib_load_font(opt.font);
   if (!fn)
      eprintf("failed to load font %s", opt.font);

   if (opt.stylefile)
   {
      style = gib_style_new_from_ascii(opt.stylefile);
      if (!style)
         weprintf("failed to load style %s", opt.stylefile);
   }

   if (opt.bg_image)
   {
      if (gib_imlib_load_image(&bg_image, opt.bg_image))
      {
         bgw = gib_imlib_image_get_width(bg_image);
         bgh = gib_imlib_image_get_height(bg_image);
      }
      else
      {
         weprintf("failed to load background image \"%s\"", opt.bg_image);
      }
   }

   lines = gozer_calculate_lines(fn, style);

   l = lines;
   while (l)
   {
      p = (char *) l->data;
      gib_imlib_get_text_size(fn, p, style, &ww, &hh, IMLIB_TEXT_TO_RIGHT);
      if (ww > w)
         w = ww;
      h += hh;
      if (l->next)
         h += opt.line_spacing;
      l = l->next;
   }

   /* If we have an offset, increase the size */
   if (opt.x)
      w += opt.x;
   if (opt.y)
      h += opt.y;

   if (bg_image && opt.bg_resize)
      image = imlib_create_image(bgw, bgh);
   else
      image = imlib_create_image(w, h);

   if (!image)
      eprintf("couldn't create imlib image for text area.");

   /* make image transparent (HACK - imlib2 should do this nicely) */
   gib_imlib_image_set_has_alpha(image, 1);
   memset(atab, 0, sizeof(atab));
   gib_imlib_apply_color_modifier_to_rectangle(image, 0, 0, w, h, NULL, NULL,
                                               NULL, atab);

   gib_imlib_image_fill_rectangle(image, 0, 0, w, h, opt.bg_r, opt.bg_g,
                                  opt.bg_b, opt.bg_a);
   if (bg_image)
   {
      if (opt.bg_scale)
      {
         gib_imlib_blend_image_onto_image(image, bg_image, 1, 0, 0, bgw, bgh,
                                          0, 0, w, h, 0, 1, 1);
      }
      else if (opt.bg_tile)
      {
         gib_imlib_image_tile(bg_image);
         gib_imlib_blend_image_onto_image(image, bg_image, 1, 0, 0, bgw, bgh,
                                          0, 0, w, h, 0, 1, 1);
      }
      else
      {
         gib_imlib_blend_image_onto_image(image, bg_image, 1, 0, 0, bgw, bgh,
                                          0, 0, bgw, bgh, 0, 1, 1);
      }
   }
   l = lines;
   x = opt.x;
   y = opt.y;
   while (l)
   {
      p = (char *) l->data;
      gib_imlib_get_text_size(fn, p, style, &ww, &hh, IMLIB_TEXT_TO_RIGHT);
      switch (opt.justification)
      {
        case JUST_LEFT:
           x = opt.x;
           gib_imlib_text_draw(image, fn, style, x, y, p, IMLIB_TEXT_TO_RIGHT,
                               opt.fn_r, opt.fn_g, opt.fn_b, opt.fn_a);
           break;
        case JUST_CENTER:
           x = ((((opt.bg_resize && bgw) ? bgw : w) - ww) / 2);
           /* y = ((((opt.bg_resize && bgw) ? bgh : h) - hh) / 2); */
           gib_imlib_text_draw(image, fn, style, x, y, p, IMLIB_TEXT_TO_RIGHT,
                               opt.fn_r, opt.fn_g, opt.fn_b, opt.fn_a);
           break;
        case JUST_RIGHT:
           x = (((opt.bg_resize && bgw) ? bgw : w) - ww);
           gib_imlib_text_draw(image, fn, style, x, y, p, IMLIB_TEXT_TO_RIGHT,
                               opt.fn_r, opt.fn_g, opt.fn_b, opt.fn_a);

           break;
        case JUST_BLOCK:
           words = gib_string_split(p, " ");
           if (words)
           {
              int wordcnt, word_spacing, line_w;
              int t_width, m_width, space_width, offset = 0;

              wordcnt = gib_list_length(words);
              gib_imlib_get_text_size(fn, p, style, &line_w, NULL,
                                      IMLIB_TEXT_TO_RIGHT);
              gib_imlib_get_text_size(fn, "M M", style, &t_width, NULL,
                                      IMLIB_TEXT_TO_RIGHT);
              gib_imlib_get_text_size(fn, "M", style, &m_width, NULL,
                                      IMLIB_TEXT_TO_RIGHT);
              space_width = t_width - (2 * m_width);

              if (wordcnt > 1)
                 word_spacing = (w - line_w) / (wordcnt - 1);
              else
                 word_spacing = (w - line_w);

              ll = words;
              while (ll)
              {
                 pp = (char *) ll->data;
                 if (strcmp(pp, " "))
                 {
                    int wordw;

                    gib_imlib_text_draw(image, fn, style, x + offset, y, pp,
                                        IMLIB_TEXT_TO_RIGHT, opt.fn_r,
                                        opt.fn_g, opt.fn_b, opt.fn_a);
                    gib_imlib_get_text_size(fn, pp, style, &wordw, NULL,
                                            IMLIB_TEXT_TO_RIGHT);
                    offset += (wordw + space_width + word_spacing);
                 }
                 ll = ll->next;
              }
              gib_list_free_and_data(words);
           }
           break;

        default:
           break;
      }
      y += hh + opt.line_spacing;
      l = l->next;
   }

   imlib_context_set_image(image);
   imlib_image_attach_data_value("quality", NULL, opt.quality, NULL);

   gib_imlib_save_image_with_error_return(image, opt.output_file, &err);
   if (err)
      eprintf("Saving to file %s failed", opt.output_file);
   if (opt.to_stdout)
   {
      gozer_stream_file(opt.output_file, opt.cgi);
      unlink(opt.output_file);
   }

   return 0;
}


gib_list *
gozer_calculate_lines(Imlib_Font fn, gib_style * style)
{
   gib_list *ll, *lines = NULL, *list = NULL, *words;
   gib_list *l = NULL;
   char delim[2] = { '\n', '\0' };
   int w, line_width;
   int tw, th;
   char *p, *pp;
   char *line = NULL;
   char *temp;
   int space_width = 0, m_width = 0, t_width = 0, new_width = 0;

   lines = gib_string_split(opt.text, delim);

   if (opt.wrap_width)
   {
      gib_imlib_get_text_size(fn, "M M", style, &t_width, NULL,
                              IMLIB_TEXT_TO_RIGHT);
      gib_imlib_get_text_size(fn, "M", style, &m_width, NULL,
                              IMLIB_TEXT_TO_RIGHT);
      space_width = t_width - (2 * m_width);
      w = opt.wrap_width;
      l = lines;
      while (l)
      {
         line_width = 0;
         p = (char *) l->data;
         /* quick check to see if whole line fits okay */
         gib_imlib_get_text_size(fn, p, style, &tw, &th, IMLIB_TEXT_TO_RIGHT);
         if (tw <= w)
            list = gib_list_add_end(list, estrdup(p));
         else if (strlen(p) == 0)
            list = gib_list_add_end(list, estrdup(""));
         else if (!strcmp(p, " "))
            list = gib_list_add_end(list, estrdup(" "));
         else
         {
            words = gib_string_split(p, " ");
            if (words)
            {
               ll = words;
               while (ll)
               {
                  pp = (char *) ll->data;
                  if (strcmp(pp, " "))
                  {
                     gib_imlib_get_text_size(fn, pp, style, &tw, &th,
                                             IMLIB_TEXT_TO_RIGHT);
                     if (line_width == 0)
                        new_width = tw;
                     else
                        new_width = line_width + space_width + tw;
                     if (new_width <= w)
                     {
                        /* add word to line */
                        if (line)
                        {
                           int len;

                           len = strlen(line) + strlen(pp) + 2;
                           temp = emalloc(len);
                           snprintf(temp, len, "%s %s", line, pp);
                           free(line);
                           line = temp;
                        }
                        else
                           line = estrdup(pp);
                        line_width = new_width;
                     }
                     else if (line_width == 0)
                     {
                        /* can't fit single word in :/
                           increase width limit to width of word and jam the bastard
                           in anyhow */
                        w = tw;
                        line = estrdup(pp);
                        line_width = new_width;
                     }
                     else
                     {
                        /* finish this line, start next and add word there */
                        if (line)
                        {
                           list = gib_list_add_end(list, estrdup(line));
                           free(line);
                           line = NULL;
                        }
                        line = estrdup(pp);
                        line_width = tw;
                     }
                  }
                  ll = ll->next;
               }
               if (line)
               {
                  /* finish last line */
                  list = gib_list_add_end(list, estrdup(line));
                  free(line);
                  line = NULL;
                  line_width = 0;
               }
               gib_list_free_and_data(words);
            }
         }
         l = l->next;
      }
      gib_list_free_and_data(lines);
      lines = list;
   }
   else
      lines = lines;
   return lines;
}

char *
gozer_read_file(char *filename)
{
   FILE *fp;
   struct stat st;
   char *text;

   if (stat(filename, &st) == -1)
   {
      weprintf("couldn't stat file %s :", filename);
      return NULL;
   }

   fp = fopen(filename, "r");

   if (!fp)
   {
      weprintf("couldn't open file %s :", filename);
      return NULL;
   }

   text = malloc(st.st_size + 1);
   fread(text, 1, st.st_size, fp);
   text[st.st_size] = '\0';

   return text;
}

char *
gozer_read_pipe()
{
   char buf[PIPE_BUF_MAX] = "", buf2[1023] = "", *text = NULL;
   int len = 0;

   while (fgets(buf2, 1023, stdin))
   {
      len += strlen(buf2);
      if (len < PIPE_BUF_MAX)
      {
         strncat(buf, buf2, 1023);
      }
      else
      {
         weprintf("Truncating oversized pipe buffer at %d bytes.", len);
      }
   }
   text = _estrdup(buf);
   return text;
}

void
gozer_stream_file(char *file, int headers)
{
   FILE *fp;
   int c;

   if (headers)
   {
      /* print headers for user-agents */
      char *extension;

      extension = strrchr(file, '.');
      extension++;
      if (extension)
      {
         if (!strcasecmp(extension, "jpg"))
            printf("Content-type: image/jpeg\n");
         else
            printf("Content-type: image/%s\n", extension);
      }
      else
         weprintf("couldn't determine file extension for mime type setting");
      printf("\n");
   }

   fp = fopen(file, "r");
   if (!fp)
   {
      weprintf("couldn't open file %s for streaming\n", file);
      return;
   }
   while (!feof(fp))
   {
      c = fgetc(fp);
      fputc(c, stdout);
   }
}