Simplify OpenAI plain input

app/src/main/java/eu/faircode/email/AI.java

@@ -61,20 +61,27 @@ public class AI {
                 messages.add(new OpenAI.Message(OpenAI.SYSTEM, new OpenAI.Content[]{
                         new OpenAI.Content(OpenAI.CONTENT_TEXT, systemPrompt)}));
 
+            if (body instanceof Spannable && multimodal) {
                 messages.add(new OpenAI.Message(OpenAI.USER, new OpenAI.Content[]{
                         new OpenAI.Content(OpenAI.CONTENT_TEXT, prompt == null ? defaultPrompt : prompt)}));
 
                 if (!TextUtils.isEmpty(body))
-                if (body instanceof Spannable && multimodal)
                     messages.add(new OpenAI.Message(OpenAI.USER,
                             OpenAI.Content.get((Spannable) body, id, context)));
-                else
-                    messages.add(new OpenAI.Message(OpenAI.USER, new OpenAI.Content[]{
-                            new OpenAI.Content(OpenAI.CONTENT_TEXT, body.toString())}));
 
                 if (!TextUtils.isEmpty(reply))
                     messages.add(new OpenAI.Message(OpenAI.USER, new OpenAI.Content[]{
                             new OpenAI.Content(OpenAI.CONTENT_TEXT, reply)}));
+            } else {
+                List<String> contents = new ArrayList<>();
+                contents.add(prompt == null ? defaultPrompt : prompt);
+                if (!TextUtils.isEmpty(body))
+                    contents.add(body.toString());
+                if (!TextUtils.isEmpty(reply))
+                    contents.add(reply);
+                messages.add(new OpenAI.Message(OpenAI.USER, new OpenAI.Content[]{
+                        new OpenAI.Content(OpenAI.CONTENT_TEXT, TextUtils.join("\n", contents))}));
+            }
 
             OpenAI.Message[] completions = OpenAI.completeChat(context,
                     model, messages.toArray(new OpenAI.Message[0]), temperature, 1);
@@ -182,17 +189,22 @@ public class AI {
             boolean multimodal = prefs.getBoolean("openai_multimodal", false);
 
             List<OpenAI.Message> input = new ArrayList<>();
+
+            if (multimodal) {
                 input.add(new OpenAI.Message(OpenAI.USER,
                         new OpenAI.Content[]{new OpenAI.Content(OpenAI.CONTENT_TEXT,
                                 templatePrompt == null ? defaultPrompt : templatePrompt)}));
 
-            if (multimodal) {
                 SpannableStringBuilder ssb = HtmlHelper.fromDocument(context, d, null, null);
                 input.add(new OpenAI.Message(OpenAI.USER,
                         OpenAI.Content.get(ssb, message.id, context)));
-            } else
+            } else {
+                List<String> contents = new ArrayList<>();
+                contents.add(templatePrompt == null ? defaultPrompt : templatePrompt);
+                contents.add(body);
                 input.add(new OpenAI.Message(OpenAI.USER, new OpenAI.Content[]{
-                        new OpenAI.Content(OpenAI.CONTENT_TEXT, body)}));
+                        new OpenAI.Content(OpenAI.CONTENT_TEXT, TextUtils.join("\n", contents))}));
+            }
 
             OpenAI.Message[] completions =
                     OpenAI.completeChat(context, model, input.toArray(new OpenAI.Message[0]), temperature, 1);