fix(anilist): harden AniList query transport and search errors

AniListQuery previously ignored json.Marshal/http.NewRequest errors,
logged the wrong variable on client.Do failure, and dereferenced a
nil response body, which could panic and leave callers hanging.

- Return early with user-safe messages on encode/request failures
- Add 20s http.Client timeout and nil guards for res/res.Body
- Keep logs generic so no auth material is ever printed
- Add aniListGraphQLErrorMessage/aniListSearchStatusError helpers
  mapping 429 to a rate-limit retry message, 5xx to a temporary
  outage message, and GraphQL errors[] (even on HTTP 200) to a
  surfaced message
- AniListSearch rejects empty bodies and unparseable payloads with
  actionable errors instead of failing silently downstream

AniListFunctions.go

@@ -7,26 +7,42 @@ import (
 	"io"
 	"log"
 	"net/http"
+	"strings"
+	"time"
 )
 
 func AniListQuery(body interface{}, login bool) (json.RawMessage, string) {
-	reader, _ := json.Marshal(body)
-	response, err := http.NewRequest("POST", "https://graphql.anilist.co", bytes.NewBuffer(reader))
+	reader, err := json.Marshal(body)
 	if err != nil {
-		log.Printf("Failed at response, %s\n", err)
+		log.Printf("AniList request failed: could not encode request body\n")
+		return nil, "Could not prepare the AniList request."
+	}
+	request, err := http.NewRequest("POST", "https://graphql.anilist.co", bytes.NewBuffer(reader))
+	if err != nil {
+		log.Printf("AniList request failed: could not create request\n")
+		return nil, "Could not reach AniList. Please check your connection and try again."
 	}
 	if login && (AniListJWT{}) != aniListJwt {
-		response.Header.Add("Authorization", "Bearer "+aniListJwt.AccessToken)
+		request.Header.Add("Authorization", "Bearer "+aniListJwt.AccessToken)
 	} else if login {
 		return nil, "Please login to AniList to make this request"
 	}
-	response.Header.Add("Content-Type", "application/json")
-	response.Header.Add("Accept", "application/json")
+	request.Header.Add("Content-Type", "application/json")
+	request.Header.Add("Accept", "application/json")
 
-	client := &http.Client{}
-	res, resErr := client.Do(response)
+	client := &http.Client{Timeout: 20 * time.Second}
+	res, resErr := client.Do(request)
 	if resErr != nil {
-		log.Printf("Failed at res, %s\n", err)
+		log.Printf("AniList request failed: network error\n")
+		return nil, "Could not reach AniList. Please check your connection and try again."
+	}
+	if res == nil {
+		log.Printf("AniList request failed: empty response\n")
+		return nil, "Could not reach AniList. Please check your connection and try again."
+	}
+	if res.Body == nil {
+		log.Printf("AniList request failed: empty response body\n")
+		return nil, "Could not reach AniList. Please check your connection and try again."
 	}
 
 	defer res.Body.Close()
@@ -39,6 +55,37 @@ func AniListQuery(body interface{}, login bool) (json.RawMessage, string) {
 	return returnedBody, res.Status
 }
 
+func aniListGraphQLErrorMessage(returnedBody json.RawMessage) string {
+	var gqlErr struct {
+		Errors []struct {
+			Message string `json:"message"`
+		} `json:"errors"`
+	}
+	if err := json.Unmarshal(returnedBody, &gqlErr); err != nil {
+		return ""
+	}
+	if len(gqlErr.Errors) > 0 && strings.TrimSpace(gqlErr.Errors[0].Message) != "" {
+		return strings.TrimSpace(gqlErr.Errors[0].Message)
+	}
+	return ""
+}
+
+func aniListSearchStatusError(status string, returnedBody json.RawMessage) error {
+	if msg := aniListGraphQLErrorMessage(returnedBody); msg != "" {
+		return fmt.Errorf("AniList search failed: %s", msg)
+	}
+	if strings.Contains(status, "429") {
+		return fmt.Errorf("AniList is rate-limiting search right now. Please wait a moment and try again.")
+	}
+	if strings.Contains(status, "500") || strings.Contains(status, "502") || strings.Contains(status, "503") || strings.Contains(status, "504") {
+		return fmt.Errorf("AniList is temporarily unavailable (%s). Please try again shortly.", status)
+	}
+	if strings.HasPrefix(status, "Could not") || strings.HasPrefix(status, "Please login") {
+		return fmt.Errorf("%s", status)
+	}
+	return fmt.Errorf("AniList search failed (%s). Please try again.", status)
+}
+
 func (a *App) GetAniListItem(aniId int, login bool) AniListGetSingleAnime {
 	user := a.GetAniListLoggedInUser()
 
@@ -338,12 +385,18 @@ func (a *App) AniListSearch(query string) (interface{}, error) {
 	}
 	returnedBody, status := AniListQuery(body, false)
 	if status != "200 OK" {
-		return nil, fmt.Errorf("API search failed with status: %s", status)
+		return nil, aniListSearchStatusError(status, returnedBody)
+	}
+	if len(returnedBody) == 0 {
+		return nil, fmt.Errorf("AniList returned an empty response. Please try again.")
+	}
+	if msg := aniListGraphQLErrorMessage(returnedBody); msg != "" {
+		return nil, fmt.Errorf("AniList search failed: %s", msg)
 	}
 	var post interface{}
 	err := json.Unmarshal(returnedBody, &post)
 	if err != nil {
-		log.Printf("Failed at unmarshal, %s\n", err)
+		log.Printf("Failed at unmarshal search results\n")
 		return nil, fmt.Errorf("Failed to parse search results")
 	}
 	return post, nil