✨ feat: add DEFAULT_MODEL environment variable (#280)

* ✨ feat: add DEFAULT_MODEL environment variable

* set the model maxLength setting in the models definition

* set the model tokenLimit setting in the models definition

components/Chat/Chat.tsx

@@ -2,7 +2,7 @@ import { Conversation, Message } from '@/types/chat';
 import { IconArrowDown } from '@tabler/icons-react';
 import { KeyValuePair } from '@/types/data';
 import { ErrorMessage } from '@/types/error';
-import { OpenAIModel } from '@/types/openai';
+import { OpenAIModel, OpenAIModelID } from '@/types/openai';
 import { Prompt } from '@/types/prompt';
 import { throttle } from '@/utils';
 import { IconClearAll, IconKey, IconSettings } from '@tabler/icons-react';
@@ -29,6 +29,7 @@ interface Props {
   models: OpenAIModel[];
   apiKey: string;
   serverSideApiKeyIsSet: boolean;
+  defaultModelId: OpenAIModelID;
   messageIsStreaming: boolean;
   modelError: ErrorMessage | null;
   loading: boolean;
@@ -48,6 +49,7 @@ export const Chat: FC<Props> = memo(
     models,
     apiKey,
     serverSideApiKeyIsSet,
+    defaultModelId,
     messageIsStreaming,
     modelError,
     loading,
@@ -206,6 +208,7 @@ export const Chat: FC<Props> = memo(
                         <ModelSelect
                           model={conversation.model}
                           models={models}
+                          defaultModelId={defaultModelId}
                           onModelChange={(model) =>
                             onUpdateConversation(conversation, {
                               key: 'model',
@@ -236,12 +239,13 @@ export const Chat: FC<Props> = memo(
                       className="ml-2 cursor-pointer hover:opacity-50"
                       onClick={handleSettings}
                     >
-                    <IconSettings size={18} />
+                      <IconSettings size={18} />
                     </button>
                     <button
                       className="ml-2 cursor-pointer hover:opacity-50"
-                      onClick={onClearAll}>
-                    <IconClearAll size={18} />
+                      onClick={onClearAll}
+                    >
+                      <IconClearAll size={18} />
                     </button>
                   </div>
                   {showSettings && (
@@ -250,6 +254,7 @@ export const Chat: FC<Props> = memo(
                         <ModelSelect
                           model={conversation.model}
                           models={models}
+                          defaultModelId={defaultModelId}
                           onModelChange={(model) =>
                             onUpdateConversation(conversation, {
                               key: 'model',
@@ -306,7 +311,7 @@ export const Chat: FC<Props> = memo(
               className="flex h-7 w-7 items-center justify-center rounded-full bg-white shadow-md hover:shadow-lg focus:outline-none focus:ring-2 focus:ring-blue-500 dark:bg-[#515152d7]"
               onClick={handleScrollDown}
             >
-              <IconArrowDown size={18}/>
+              <IconArrowDown size={18} />
             </button>
           </div>
         )}

components/Chat/ChatInput.tsx

@@ -1,5 +1,5 @@
 import { Message } from '@/types/chat';
-import { OpenAIModel, OpenAIModelID } from '@/types/openai';
+import { OpenAIModel } from '@/types/openai';
 import { Prompt } from '@/types/prompt';
 import { IconPlayerStop, IconRepeat, IconSend } from '@tabler/icons-react';
 import { useTranslation } from 'next-i18next';
@@ -56,7 +56,7 @@ export const ChatInput: FC<Props> = ({
 
   const handleChange = (e: React.ChangeEvent<HTMLTextAreaElement>) => {
     const value = e.target.value;
-    const maxLength = model.id === OpenAIModelID.GPT_3_5 ? 12000 : 24000;
+    const maxLength = model.maxLength;
 
     if (value.length > maxLength) {
       alert(
@@ -109,7 +109,10 @@ export const ChatInput: FC<Props> = ({
     const selectedPrompt = filteredPrompts[activePromptIndex];
     if (selectedPrompt) {
       setContent((prevContent) => {
-        const newContent = prevContent?.replace(/\/\w*$/, selectedPrompt.content);
+        const newContent = prevContent?.replace(
+          /\/\w*$/,
+          selectedPrompt.content,
+        );
         return newContent;
       });
       handlePromptSelect(selectedPrompt);
@@ -211,8 +214,9 @@ export const ChatInput: FC<Props> = ({
     if (textareaRef && textareaRef.current) {
       textareaRef.current.style.height = 'inherit';
       textareaRef.current.style.height = `${textareaRef.current?.scrollHeight}px`;
-      textareaRef.current.style.overflow = `${textareaRef?.current?.scrollHeight > 400 ? 'auto' : 'hidden'
-        }`;
+      textareaRef.current.style.overflow = `${
+        textareaRef?.current?.scrollHeight > 400 ? 'auto' : 'hidden'
+      }`;
     }
   }, [content]);
 
@@ -257,15 +261,16 @@ export const ChatInput: FC<Props> = ({
         <div className="relative mx-2 flex w-full flex-grow flex-col rounded-md border border-black/10 bg-white shadow-[0_0_10px_rgba(0,0,0,0.10)] dark:border-gray-900/50 dark:bg-[#40414F] dark:text-white dark:shadow-[0_0_15px_rgba(0,0,0,0.10)] sm:mx-4">
           <textarea
             ref={textareaRef}
-            className="m-0 w-full resize-none border-0 bg-transparent p-0 pr-8 pl-2 text-black dark:bg-transparent dark:text-white py-2 md:py-3 md:pl-4"
+            className="m-0 w-full resize-none border-0 bg-transparent p-0 py-2 pr-8 pl-2 text-black dark:bg-transparent dark:text-white md:py-3 md:pl-4"
             style={{
               resize: 'none',
               bottom: `${textareaRef?.current?.scrollHeight}px`,
               maxHeight: '400px',
-              overflow: `${textareaRef.current && textareaRef.current.scrollHeight > 400
-                ? 'auto'
-                : 'hidden'
-                }`,
+              overflow: `${
+                textareaRef.current && textareaRef.current.scrollHeight > 400
+                  ? 'auto'
+                  : 'hidden'
+              }`,
             }}
             placeholder={
               t('Type a message or type "/" to select a prompt...') || ''
@@ -278,7 +283,7 @@ export const ChatInput: FC<Props> = ({
             onKeyDown={handleKeyDown}
           />
           <button
-            className="absolute right-2 top-2 rounded-sm p-1 text-neutral-800 hover:bg-neutral-200 hover:text-neutral-900 dark:bg-opacity-50 dark:text-neutral-100 dark:hover:text-neutral-200 opacity-60"
+            className="absolute right-2 top-2 rounded-sm p-1 text-neutral-800 opacity-60 hover:bg-neutral-200 hover:text-neutral-900 dark:bg-opacity-50 dark:text-neutral-100 dark:hover:text-neutral-200"
             onClick={handleSend}
           >
             <IconSend size={18} />

components/Chat/ModelSelect.tsx

@@ -1,15 +1,22 @@
-import { OpenAIModel } from '@/types/openai';
+import { OpenAIModel, OpenAIModelID } from '@/types/openai';
 import { useTranslation } from 'next-i18next';
 import { FC } from 'react';
 
 interface Props {
   model: OpenAIModel;
   models: OpenAIModel[];
+  defaultModelId: OpenAIModelID;
   onModelChange: (model: OpenAIModel) => void;
 }
 
-export const ModelSelect: FC<Props> = ({ model, models, onModelChange }) => {
+export const ModelSelect: FC<Props> = ({
+  model,
+  models,
+  defaultModelId,
+  onModelChange,
+}) => {
   const { t } = useTranslation('chat');
+
   return (
     <div className="flex flex-col">
       <label className="mb-2 text-left text-neutral-700 dark:text-neutral-400">
@@ -19,7 +26,7 @@ export const ModelSelect: FC<Props> = ({ model, models, onModelChange }) => {
         <select
           className="w-full bg-transparent p-2"
           placeholder={t('Select a model') || ''}
-          value={model.id}
+          value={model?.id || defaultModelId}
           onChange={(e) => {
             onModelChange(
               models.find(
@@ -34,7 +41,9 @@ export const ModelSelect: FC<Props> = ({ model, models, onModelChange }) => {
               value={model.id}
               className="dark:bg-[#343541] dark:text-white"
             >
-              {model.name}
+              {model.id === defaultModelId
+                ? `Default (${model.name})`
+                : model.name}
             </option>
           ))}
         </select>

components/Chat/SystemPrompt.tsx

@@ -43,8 +43,7 @@ export const SystemPrompt: FC<Props> = ({
 
   const handleChange = (e: React.ChangeEvent<HTMLTextAreaElement>) => {
     const value = e.target.value;
-    const maxLength =
-      conversation.model.id === OpenAIModelID.GPT_3_5 ? 12000 : 24000;
+    const maxLength = conversation.model.maxLength;
 
     if (value.length > maxLength) {
       alert(