1 files changed, 71 insertions, 0 deletions
diff --git a/anime/errhandlers.go b/anime/errhandlers.go
new file mode 100644
index 0000000..d7f70f9
--- /dev/null
+++ b/anime/errhandlers.go
@@ -0,0 +1,71 @@
+/* mal2go - MyAnimeList V2 API wrapper for Go
+ * Copyright (C) 2022  Vidhu Kant Sharma <vidhukant@protonmail.ch>
+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>. */
+
+package anime
+
+import (
+  "errors"
+  "fmt"
+)
+
+/* NOTE: MAL still seems to send some fields 
+ * even if they aren't requested.
+ * those include Title, Picture, Id, etc */
+// default fields to use when none are specified
+var defaultFields []string = []string{
+  "id", "title", "main_picture",
+  "alternative_titles", "start_date",
+  "end_date", "synopsis", "mean", "rank",
+  "popularity", "num_list_users",
+  "num_scoring_users", "nsfw", "created_at",
+  "updated_at", "media_type", "status",
+  "genres", "my_list_status", "num_episodes",
+  "start_season", "broadcast", "source",
+  "average_episode_duration", "rating",
+  "pictures", "background", "related_anime",
+  "related_manga", "recommendations",
+  "studios", "statistics",
+}
+
+// if fields aren't specified
+func fieldsErrHandler(fields []string) ([]string, error) {
+  if cap(fields) == 0 {
+    // uses all the default fields if none specified
+    return defaultFields, nil
+  }
+
+  // checks if each given field is valid
+  for _, j := range(fields) {
+    if !isValidField(j) {
+      return []string{}, errors.New(fmt.Sprintf("InvalidFieldError: Invalid field specified: \"%s\"", j))
+    }
+  }
+
+  // everything's fine!
+  return fields, nil
+}
+
+// if limit or error specified are above the limit
+func limitsErrHandler(limit, offset int) error {
+  maxOffset := 500 - limit
+  if limit > 500 {
+    return errors.New(fmt.Sprintf("InvalidLimitError: Limit specified too high (%d > 500).", limit))
+  } else if offset > maxOffset {
+    return errors.New(fmt.Sprintf("InvalidOffsetError: Offset specified too high (%d > %d).", offset, maxOffset))
+  }
+  // return nil if no error
+  return nil
+}