Migrate LLM client to OpenAI SDK and implement WebUI-specific fileID handling

internal/transport/webui/bot_test.go

@@ -51,6 +51,66 @@ func TestHandleChatSuccess(t *testing.T) {
 	}
 }
 
+func TestHandleChatWithFileIDs(t *testing.T) {
+	b := newTestBot(t, 1024*1024)
+	b.chatHandler = func(_ context.Context, msg IncomingMessage) (string, error) {
+		if msg.ChatID != "s1" || msg.UserID != "u1" || msg.Text != "hello" {
+			t.Fatalf("unexpected message: %+v", msg)
+		}
+		if len(msg.FileIDs) != 2 || msg.FileIDs[0] != "file_a" || msg.FileIDs[1] != "file_b" {
+			t.Fatalf("unexpected file ids: %+v", msg.FileIDs)
+		}
+		return "ok", nil
+	}
+
+	body := strings.NewReader(`{"text":"hello","session_id":"s1","user_id":"u1","file_ids":["file_a","file_b"]}`)
+	req := httptest.NewRequest(http.MethodPost, "/api/chat", body)
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+
+	b.handleChat(w, req)
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d body=%s", w.Code, w.Body.String())
+	}
+}
+
+func TestHandleChatWithFileIDsAliases(t *testing.T) {
+	tests := []struct {
+		name string
+		body string
+	}{
+		{name: "camel array", body: `{"text":"hello","sessionId":"s1","userId":"u1","fileIds":["file_a","file_b"]}`},
+		{name: "flat array", body: `{"text":"hello","session_id":"s1","user_id":"u1","fileids":["file_a","file_b"]}`},
+		{name: "single key", body: `{"text":"hello","session_id":"s1","user_id":"u1","file_id":"file_a"}`},
+		{name: "csv string", body: `{"text":"hello","session_id":"s1","user_id":"u1","file_ids":"file_a, file_b"}`},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			b := newTestBot(t, 1024*1024)
+			b.chatHandler = func(_ context.Context, msg IncomingMessage) (string, error) {
+				if msg.ChatID != "s1" || msg.UserID != "u1" || msg.Text != "hello" {
+					t.Fatalf("unexpected message: %+v", msg)
+				}
+				if len(msg.FileIDs) == 0 {
+					t.Fatalf("expected file ids from alias payload, got empty")
+				}
+				return "ok", nil
+			}
+
+			body := strings.NewReader(tt.body)
+			req := httptest.NewRequest(http.MethodPost, "/api/chat", body)
+			req.Header.Set("Content-Type", "application/json")
+			w := httptest.NewRecorder()
+
+			b.handleChat(w, req)
+			if w.Code != http.StatusOK {
+				t.Fatalf("expected 200, got %d body=%s", w.Code, w.Body.String())
+			}
+		})
+	}
+}
+
 func TestHandleChatMissingText(t *testing.T) {
 	b := newTestBot(t, 1024*1024)
 	b.chatHandler = func(_ context.Context, _ IncomingMessage) (string, error) { return "", nil }