/* See LICENSE file for license and copyright information */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <libgen.h>

#include "completion.h"
#include "utils.h"

girara_completion_t*
cc_open(girara_session_t* session, char* input)
{
  g_return_val_if_fail(session != NULL, NULL);
  g_return_val_if_fail(session->global.data != NULL, NULL);
  zathura_t* zathura = session->global.data;

  girara_completion_t* completion  = girara_completion_init();
  girara_completion_group_t* group = girara_completion_group_create(session, NULL);

  gchar* path         = NULL;
  gchar* current_path = NULL;

  if (completion == NULL || group == NULL) {
    goto error_free;
  }

  path = girara_fix_path(input);
  if (path == NULL) {
    goto error_free;
  }

  /* If the path does not begin with a slash we update the path with the current
   * working directory */
  if (strlen(path) == 0 || path[0] != '/') {
    size_t path_max;
#ifdef PATH_MAX
    path_max = PATH_MAX;
#else
    path_max = pathconf(path,_PC_PATH_MAX);
    if (path_max <= 0)
      path_max = 4096;
#endif

    char cwd[path_max];
    getcwd(cwd, path_max);

    char* tmp_path = g_strdup_printf("%s/%s", cwd, path);
    if (tmp_path == NULL) {
      goto error_free;
    }

    g_free(path);
    path = tmp_path;
  }

  /* Append a slash if the given argument is a directory */
  bool is_dir = (path[strlen(path) - 1] == '/') ? true : false;
  if ((g_file_test(path, G_FILE_TEST_IS_DIR) == TRUE) && !is_dir) {
    char* tmp_path = g_strdup_printf("%s/", path);
    if (tmp_path == NULL) {
      goto error_free;
    }

    g_free(path);
    path = tmp_path;
    is_dir = true;
  }

  /* get current path */
  char* tmp    = g_strdup(path);
  current_path = is_dir ? g_strdup(tmp) : g_strdup(dirname(tmp));
  g_free(tmp);

  /* get current file */
  gchar* current_file     = is_dir ? "" : basename(path);
  int current_file_length = strlen(current_file);

  /* read directory */
  if (g_file_test(current_path, G_FILE_TEST_IS_DIR) == TRUE) {
    GDir* dir = g_dir_open(current_path, 0, NULL);
    if (dir == NULL) {
      goto error_free;
    }

    /* read files */
    char* name = NULL;
    while ((name = (char*) g_dir_read_name(dir)) != NULL) {
      char* e_name   = g_filename_display_name(name);
      int   e_length = strlen(e_name);

      if (e_name == NULL) {
        goto error_free;
      }

      if ((current_file_length > e_length) || strncmp(current_file, e_name,
            current_file_length)) {
        g_free(e_name);
        continue;
      }

      char* full_path = g_strdup_printf("%s%s%s", current_path, is_dir ? "" : "/", e_name);
      if (full_path == NULL) {
        g_free(e_name);
        goto error_free;
      }

      if (g_file_test(full_path, G_FILE_TEST_IS_DIR) == true) {
        char* tmp_path = full_path;
        full_path = g_strdup_printf("%s/", full_path);
        g_free(tmp_path);
        girara_completion_group_add_element(group, full_path, NULL);
      } else if (file_valid_extension(zathura, full_path) == true) {
        girara_completion_group_add_element(group, full_path, NULL);
      }

      g_free(full_path);
      g_free(e_name);
    }

    g_dir_close(dir);
  }

  g_free(path);

  girara_completion_add_group(completion, group);

  return completion;

error_free:

  if (completion) {
    girara_completion_free(completion);
  }
  if (group) {
    girara_completion_group_free(group);
  }

  g_free(current_path);
  g_free(path);

  return NULL;
}