resolve some bugs

anilist-cmp/__init__.py

@@ -7,7 +7,7 @@
 from fastapi.responses import Response
 
 if TYPE_CHECKING:
-    from .types_.responses import AnilistResponse, InnerMediaEntry, MediaEntry
+    from .types_.responses import AnilistError, AnilistErrorResponse, AnilistResponse, InnerMediaEntry, MediaEntry
 
 app = FastAPI(debug=False, title="Welcome!", version="0.0.1", openapi_url=None, redoc_url=None, docs_url=None)
 
@@ -88,12 +88,18 @@
 """
 
 
+class NoPlanningData(ValueError):
+    def __init__(self, user: int, *args: object) -> None:
+        self.user = user
+        super().__init__(*args)
+
+
 def format_entries_as_table(entries: dict[int, InnerMediaEntry]) -> str:
     rows = [ROW.format_map(entry) for entry in entries.values()]
     return TABLE.format(body="\n".join(rows))
 
 
-async def _fetch_user_entries(*usernames: str) -> AnilistResponse:
+async def _fetch_user_entries(*usernames: str) -> AnilistResponse | AnilistErrorResponse:
     username1, username2 = usernames
 
     async with aiohttp.ClientSession() as session, session.post(
@@ -108,28 +114,59 @@ def _restructure_entries(entries: list[MediaEntry]) -> dict[int, InnerMediaEntry
 
 
 def _get_common_planning(data: AnilistResponse) -> dict[int, InnerMediaEntry]:
-    user1_data = data["data"]["user1"]
-    user2_data = data["data"]["user2"]
+    user1_data = data["data"]["user1"]["lists"]
+    user2_data = data["data"]["user2"]["lists"]
+
+    if not user1_data:
+        raise NoPlanningData(1)
+    elif not user2_data:
+        raise NoPlanningData(2)
 
-    user1_entries = _restructure_entries(user1_data["lists"][0]["entries"])
-    user2_entries = _restructure_entries(user2_data["lists"][0]["entries"])
+    user1_entries = _restructure_entries(user1_data[0]["entries"])
+    user2_entries = _restructure_entries(user2_data[0]["entries"])
 
     all_anime = user1_entries | user2_entries
     common_anime = user1_entries.keys() & user2_entries.keys()
 
     return {id_: all_anime[id_] for id_ in common_anime}
 
 
+def _handle_errors(errors: list[AnilistError], user1: str, user2: str) -> list[str]:
+    missing_users: list[str] = []
+    for error in errors:
+        if error["message"] == "User not found":
+            for location in error["locations"]:
+                if location["column"] == 2:
+                    missing_users.append(user1)
+                elif location["column"] == 17:
+                    missing_users.append(user2)
+
+    return missing_users
+
+
 @app.get("/")
 async def index() -> Response:
     return Response("Did you forget to add path parameters? Like <url>/User1/User2?", media_type="text/plain")
 
 
 @app.get("/{user1}/{user2}")
 async def get_matches(request: Request, user1: str, user2: str) -> Response:
+    if user1.casefold() == user2.casefold():
+        return Response("Haha, you're really funny.", media_type="text/plain")
+
     data = await _fetch_user_entries(user1.casefold(), user2.casefold())
 
-    matching_items = _get_common_planning(data)
+    if errors := data.get("errors"):
+        errored_users = _handle_errors(errors, user1, user2)
+
+        fmt = ", ".join(errored_users)
+        return Response(f"Sorry, it seems that user(s) {fmt} are not found.")
+
+    try:
+        matching_items = _get_common_planning(data)  # type: ignore # the type is resolved above.
+    except NoPlanningData as err:
+        errored_user = user1 if err.user == 1 else user2
+        return Response(f"Sorry, but {errored_user} has no Planning entries!", media_type="text/plain")
 
     if not matching_items:
         return Response("No planning anime in common :(", status_code=405, media_type="text/plain")

anilist-cmp/types_/responses.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TypedDict
+from typing import Literal, TypedDict
 
 
 class LocalizedTitle(TypedDict):
@@ -34,3 +34,24 @@ class MediaListCollectionResponse(TypedDict):
 
 class AnilistResponse(TypedDict):
     data: MediaListCollectionResponse
+
+
+class AnilistErrorLocation(TypedDict):
+    line: int
+    column: int
+
+
+class AnilistError(TypedDict):
+    message: str
+    status: int
+    locations: list[AnilistErrorLocation]
+
+
+class UserEntryError(TypedDict):
+    user1: Literal[None]
+    user2: Literal[None]
+
+
+class AnilistErrorResponse(TypedDict):
+    errors: list[AnilistError]
+    data: UserEntryError