#ifdef HAVE_CONFIG_H
# include "elementary_config.h"
#endif

#include "Elementary.h"

#include "elm_code_private.h"

#define _ELM_CODE_DIFF_WIDGET_LEFT "diffwidgetleft"
#define _ELM_CODE_DIFF_WIDGET_RIGHT "diffwidgetright"

#define _ELM_CODE_DIFF_WIDGET_TYPE_ADDED "added"
#define _ELM_CODE_DIFF_WIDGET_TYPE_REMOVED "removed"
#define _ELM_CODE_DIFF_WIDGET_TYPE_CHANGED "changed"

static void
_elm_code_diff_widget_parse_diff_line(Elm_Code_Line *line, Elm_Code_File *left, Elm_Code_File *right)
{
   const char *content;
   unsigned int length;

   if (line->length < 1)
     {
        elm_code_file_line_append(left, "", 0, NULL);
        elm_code_file_line_append(right, "", 0, NULL);
     }

   content = elm_code_line_text_get(line, &length);
   if (content[0] == '+')
     {
        elm_code_file_line_append(left, "", 0, NULL);
        elm_code_file_line_append(right, content, length, NULL);
     }
   else if (content[0] == '-')
     {
        elm_code_file_line_append(left, content, length, NULL);
        elm_code_file_line_append(right, "", 0, NULL);
     }
   else
     {
        elm_code_file_line_append(left, content, length, NULL);
        elm_code_file_line_append(right, content, length, NULL);
     }
}

static void
_elm_code_diff_widget_parse_diff(Elm_Code_File *diff, Elm_Code_File *left, Elm_Code_File *right)
{
   Eina_List *item;
   Elm_Code_Line *line;
   const char *content;
   unsigned int offset, length;

   offset = 0;
   EINA_LIST_FOREACH(diff->lines, item, line)
     {
        content = elm_code_line_text_get(line, &length);

        if (length > 0 && (content[0] == 'd' || content[0] == 'i' || content[0] == 'n'))
          {
             offset = 0;
             elm_code_file_line_append(left, content, length, NULL);
             elm_code_file_line_append(right, content, length, NULL);

             continue;
          }

        if (offset == 0)
          elm_code_file_line_append(left, content, length, NULL);
        else if (offset == 1)
          elm_code_file_line_append(right, content, length, NULL);
        else
          _elm_code_diff_widget_parse_diff_line(line, left, right);

        offset++;
     }

   _elm_code_parse_file(left->parent, left);
   _elm_code_parse_file(right->parent, right);
}

EAPI Evas_Object *
elm_code_diff_widget_add(Evas_Object *parent, Elm_Code *code)
{
   Elm_Code *wcode1, *wcode2;
   Elm_Code_Widget *widget_left, *widget_right;
   Evas_Object *hbox;

   hbox = elm_panes_add(parent);
   evas_object_size_hint_weight_set(hbox, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
   evas_object_size_hint_align_set(hbox, EVAS_HINT_FILL, EVAS_HINT_FILL);
   elm_panes_horizontal_set(hbox, EINA_FALSE);
   evas_object_show(hbox);

   // left side of diff
   wcode1 = elm_code_create();
   elm_code_parser_standard_add(wcode1, ELM_CODE_PARSER_STANDARD_DIFF);
   widget_left = efl_add(ELM_CODE_WIDGET_CLASS, parent, elm_obj_code_widget_code_set(efl_added, wcode1));

   evas_object_size_hint_weight_set(widget_left, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
   evas_object_size_hint_align_set(widget_left, EVAS_HINT_FILL, EVAS_HINT_FILL);
   evas_object_show(widget_left);
   evas_object_data_set(hbox, _ELM_CODE_DIFF_WIDGET_LEFT, widget_left);
   elm_object_part_content_set(hbox, "left", widget_left);

   // right side of diff
   wcode2 = elm_code_create();
   elm_code_parser_standard_add(wcode2, ELM_CODE_PARSER_STANDARD_DIFF);
   widget_right = efl_add(ELM_CODE_WIDGET_CLASS, parent, elm_obj_code_widget_code_set(efl_added, wcode2));

   evas_object_size_hint_weight_set(widget_right, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
   evas_object_size_hint_align_set(widget_right, EVAS_HINT_FILL, EVAS_HINT_FILL);
   evas_object_show(widget_right);
   evas_object_data_set(hbox, _ELM_CODE_DIFF_WIDGET_RIGHT, widget_right);
   elm_object_part_content_set(hbox, "right", widget_right);

   _elm_code_diff_widget_parse_diff(code->file, wcode1->file, wcode2->file);
   return hbox;
}

EAPI void
elm_code_diff_widget_font_set(Evas_Object *widget, const char *name, int size)
{
   Elm_Code_Widget *child;

   child = (Elm_Code_Widget *) evas_object_data_get(widget, _ELM_CODE_DIFF_WIDGET_LEFT);
   elm_obj_code_widget_font_set(child, name, size);
   child = (Elm_Code_Widget *) evas_object_data_get(widget, _ELM_CODE_DIFF_WIDGET_RIGHT);
   elm_obj_code_widget_font_set(child, name, size);
}