+page.svelte 24.9 KB
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<script lang="ts">
	import { v4 as uuidv4 } from 'uuid';
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	import { toast } from 'svelte-sonner';
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	import { onMount, tick, getContext } from 'svelte';
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	import { goto } from '$app/navigation';
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	import { page } from '$app/stores';
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	import {
		models,
		modelfiles,
		user,
		settings,
		chats,
		chatId,
		config,
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		WEBUI_NAME,
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		tags as _tags,
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		showSidebar,
		type Model
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	} from '$lib/stores';
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	import { copyToClipboard, splitStream, convertMessagesToHistory } from '$lib/utils';
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	import { generateChatCompletion, cancelOllamaRequest } from '$lib/apis/ollama';
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	import {
		addTagById,
		createNewChat,
		deleteTagById,
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		getAllChatTags,
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		getChatById,
		getChatList,
		getTagsById,
		updateChatById
	} from '$lib/apis/chats';
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	import { generateOpenAIChatCompletion, generateTitle } from '$lib/apis/openai';
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	import MessageInput from '$lib/components/chat/MessageInput.svelte';
	import Messages from '$lib/components/chat/Messages.svelte';
	import Navbar from '$lib/components/layout/Navbar.svelte';
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	import {
		LITELLM_API_BASE_URL,
		OPENAI_API_BASE_URL,
		OLLAMA_API_BASE_URL,
		WEBUI_BASE_URL
	} from '$lib/constants';
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	import { createOpenAITextStream } from '$lib/apis/streaming';
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	const i18n = getContext('i18n');

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	let loaded = false;
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	let stopResponseFlag = false;
	let autoScroll = true;
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	let processing = '';
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	let messagesContainerElement: HTMLDivElement;
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	let currentRequestId = null;

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	// let chatId = $page.params.id;
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	let showModelSelector = true;
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	let selectedModels = [''];
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	let atSelectedModel: Model | undefined;
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	let selectedModelfile = null;
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	$: selectedModelfile =
		selectedModels.length === 1 &&
		$modelfiles.filter((modelfile) => modelfile.tagName === selectedModels[0]).length > 0
			? $modelfiles.filter((modelfile) => modelfile.tagName === selectedModels[0])[0]
			: null;
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	let selectedModelfiles = {};
	$: selectedModelfiles = selectedModels.reduce((a, tagName, i, arr) => {
		const modelfile =
			$modelfiles.filter((modelfile) => modelfile.tagName === tagName)?.at(0) ?? undefined;

		return {
			...a,
			...(modelfile && { [tagName]: modelfile })
		};
	}, {});

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	let chat = null;
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	let tags = [];
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	let title = '';
	let prompt = '';
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	let files = [];
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	let messages = [];
	let history = {
		messages: {},
		currentId: null
	};

	$: if (history.currentId !== null) {
		let _messages = [];

		let currentMessage = history.messages[history.currentId];
		while (currentMessage !== null) {
			_messages.unshift({ ...currentMessage });
			currentMessage =
				currentMessage.parentId !== null ? history.messages[currentMessage.parentId] : null;
		}
		messages = _messages;
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	} else {
		messages = [];
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	}

	$: if ($page.params.id) {
		(async () => {
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			if (await loadChat()) {
				await tick();
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				loaded = true;
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				window.setTimeout(() => scrollToBottom(), 0);
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				const chatInput = document.getElementById('chat-textarea');
				chatInput?.focus();
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			} else {
				await goto('/');
			}
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		})();
	}

	//////////////////////////
	// Web functions
	//////////////////////////

	const loadChat = async () => {
		await chatId.set($page.params.id);
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		chat = await getChatById(localStorage.token, $chatId).catch(async (error) => {
			await goto('/');
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			return null;
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		});

		if (chat) {
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			tags = await getTags();
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			const chatContent = chat.chat;

			if (chatContent) {
				console.log(chatContent);

				selectedModels =
					(chatContent?.models ?? undefined) !== undefined
						? chatContent.models
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						: [chatContent.models ?? ''];
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				history =
					(chatContent?.history ?? undefined) !== undefined
						? chatContent.history
						: convertMessagesToHistory(chatContent.messages);
				title = chatContent.title;

				let _settings = JSON.parse(localStorage.getItem('settings') ?? '{}');
				await settings.set({
					..._settings,
					system: chatContent.system ?? _settings.system,
					options: chatContent.options ?? _settings.options
				});
				autoScroll = true;
				await tick();

				if (messages.length > 0) {
					history.messages[messages.at(-1).id].done = true;
				}
				await tick();

				return true;
			} else {
				return null;
			}
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		}
	};

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	const scrollToBottom = async () => {
		await tick();
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		if (messagesContainerElement) {
			messagesContainerElement.scrollTop = messagesContainerElement.scrollHeight;
		}
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	};

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	//////////////////////////
	// Ollama functions
	//////////////////////////

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	const submitPrompt = async (userPrompt, _user = null) => {
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		console.log('submitPrompt', $chatId);

		if (selectedModels.includes('')) {
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			toast.error($i18n.t('Model not selected'));
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		} else if (messages.length != 0 && messages.at(-1).done != true) {
			// Response not done
			console.log('wait');
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		} else if (
			files.length > 0 &&
			files.filter((file) => file.upload_status === false).length > 0
		) {
			// Upload not done
			toast.error(
				`Oops! Hold tight! Your files are still in the processing oven. We're cooking them up to perfection. Please be patient and we'll let you know once they're ready.`
			);
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		} else {
			// Reset chat message textarea height
			document.getElementById('chat-textarea').style.height = '';

			// Create user message
			let userMessageId = uuidv4();
			let userMessage = {
				id: userMessageId,
				parentId: messages.length !== 0 ? messages.at(-1).id : null,
				childrenIds: [],
				role: 'user',
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				user: _user ?? undefined,
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				content: userPrompt,
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				files: files.length > 0 ? files : undefined,
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				timestamp: Math.floor(Date.now() / 1000) // Unix epoch
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			};

			// Add message to history and Set currentId to messageId
			history.messages[userMessageId] = userMessage;
			history.currentId = userMessageId;

			// Append messageId to childrenIds of parent message
			if (messages.length !== 0) {
				history.messages[messages.at(-1).id].childrenIds.push(userMessageId);
			}

			// Wait until history/message have been updated
			await tick();

			// Create new chat if only one message in messages
			if (messages.length == 1) {
				if ($settings.saveChatHistory ?? true) {
					chat = await createNewChat(localStorage.token, {
						id: $chatId,
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						title: $i18n.t('New Chat'),
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						models: selectedModels,
						system: $settings.system ?? undefined,
						options: {
							...($settings.options ?? {})
						},
						messages: messages,
						history: history,
						timestamp: Date.now()
					});
					await chats.set(await getChatList(localStorage.token));
					await chatId.set(chat.id);
				} else {
					await chatId.set('local');
				}
				await tick();
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			}
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			// Reset chat input textarea
			prompt = '';
			files = [];

			// Send prompt
			await sendPrompt(userPrompt, userMessageId);
		}
	};
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	const sendPrompt = async (prompt, parentId) => {
		const _chatId = JSON.parse(JSON.stringify($chatId));
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		await Promise.all(
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			(atSelectedModel !== undefined ? [atSelectedModel.id] : selectedModels).map(
				async (modelId) => {
					const model = $models.filter((m) => m.id === modelId).at(0);

					if (model) {
						// If there are image files, check if model is vision capable
						const hasImages = messages.some((message) =>
							message.files?.some((file) => file.type === 'image')
						);
						if (hasImages && !(model.custom_info?.vision_capable ?? true)) {
							toast.error(
								$i18n.t('Model {{modelName}} is not vision capable', {
									modelName: model.custom_info?.displayName ?? model.name ?? model.id
								})
							);
						}

						// Create response message
						let responseMessageId = uuidv4();
						let responseMessage = {
							parentId: parentId,
							id: responseMessageId,
							childrenIds: [],
							role: 'assistant',
							content: '',
							model: model.id,
							modelName: model.custom_info?.displayName ?? model.name ?? model.id,
							timestamp: Math.floor(Date.now() / 1000) // Unix epoch
						};

						// Add message to history and Set currentId to messageId
						history.messages[responseMessageId] = responseMessage;
						history.currentId = responseMessageId;

						// Append messageId to childrenIds of parent message
						if (parentId !== null) {
							history.messages[parentId].childrenIds = [
								...history.messages[parentId].childrenIds,
								responseMessageId
							];
						}
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						if (model?.external) {
							await sendPromptOpenAI(model, prompt, responseMessageId, _chatId);
						} else if (model) {
							await sendPromptOllama(model, prompt, responseMessageId, _chatId);
						}
					} else {
						toast.error($i18n.t(`Model {{modelId}} not found`, { modelId }));
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					}
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				}
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			)
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		);

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		await chats.set(await getChatList(localStorage.token));
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	};
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	const sendPromptOllama = async (model, userPrompt, responseMessageId, _chatId) => {
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		model = model.id;
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		const responseMessage = history.messages[responseMessageId];
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		// Wait until history/message have been updated
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		await tick();
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		// Scroll down
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		scrollToBottom();
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		const messagesBody = [
			$settings.system
				? {
						role: 'system',
						content: $settings.system
				  }
				: undefined,
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			...messages
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		]
			.filter((message) => message)
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			.map((message, idx, arr) => {
				// Prepare the base message object
				const baseMessage = {
					role: message.role,
					content: arr.length - 2 !== idx ? message.content : message?.raContent ?? message.content
				};

				// Extract and format image URLs if any exist
				const imageUrls = message.files
					?.filter((file) => file.type === 'image')
					.map((file) => file.url.slice(file.url.indexOf(',') + 1));

				// Add images array only if it contains elements
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				if (imageUrls && imageUrls.length > 0 && message.role === 'user') {
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					baseMessage.images = imageUrls;
				}

				return baseMessage;
			});
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		let lastImageIndex = -1;

		// Find the index of the last object with images
		messagesBody.forEach((item, index) => {
			if (item.images) {
				lastImageIndex = index;
			}
		});

		// Remove images from all but the last one
		messagesBody.forEach((item, index) => {
			if (index !== lastImageIndex) {
				delete item.images;
			}
		});

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		const docs = messages
			.filter((message) => message?.files ?? null)
			.map((message) =>
				message.files.filter((item) => item.type === 'doc' || item.type === 'collection')
			)
			.flat(1);

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		const [res, controller] = await generateChatCompletion(localStorage.token, {
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			model: model,
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			messages: messagesBody,
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			options: {
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				...($settings.options ?? {}),
				stop:
					$settings?.options?.stop ?? undefined
						? $settings.options.stop.map((str) =>
								decodeURIComponent(JSON.parse('"' + str.replace(/\"/g, '\\"') + '"'))
						  )
						: undefined
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			},
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			format: $settings.requestFormat ?? undefined,
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			keep_alive: $settings.keepAlive ?? undefined,
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			docs: docs.length > 0 ? docs : undefined,
			citations: docs.length > 0
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		});
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		if (res && res.ok) {
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			console.log('controller', controller);

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			const reader = res.body
				.pipeThrough(new TextDecoderStream())
				.pipeThrough(splitStream('\n'))
				.getReader();

			while (true) {
				const { value, done } = await reader.read();
				if (done || stopResponseFlag || _chatId !== $chatId) {
					responseMessage.done = true;
					messages = messages;
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					if (stopResponseFlag) {
						controller.abort('User: Stop Response');
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						await cancelOllamaRequest(localStorage.token, currentRequestId);
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					}
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					currentRequestId = null;
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					break;
				}
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				try {
					let lines = value.split('\n');
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					for (const line of lines) {
						if (line !== '') {
							console.log(line);
							let data = JSON.parse(line);
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							if ('citations' in data) {
								responseMessage.citations = data.citations;
								continue;
							}

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							if ('detail' in data) {
								throw data;
							}
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							if ('id' in data) {
								console.log(data);
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								currentRequestId = data.id;
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							} else {
								if (data.done == false) {
									if (responseMessage.content == '' && data.message.content == '\n') {
										continue;
									} else {
										responseMessage.content += data.message.content;
										messages = messages;
									}
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								} else {
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									responseMessage.done = true;

									if (responseMessage.content == '') {
										responseMessage.error = true;
										responseMessage.content =
											'Oops! No text generated from Ollama, Please try again.';
									}

									responseMessage.context = data.context ?? null;
									responseMessage.info = {
										total_duration: data.total_duration,
										load_duration: data.load_duration,
										sample_count: data.sample_count,
										sample_duration: data.sample_duration,
										prompt_eval_count: data.prompt_eval_count,
										prompt_eval_duration: data.prompt_eval_duration,
										eval_count: data.eval_count,
										eval_duration: data.eval_duration
									};
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									messages = messages;
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									if ($settings.notificationEnabled && !document.hasFocus()) {
										const notification = new Notification(
											selectedModelfile
												? `${
														selectedModelfile.title.charAt(0).toUpperCase() +
														selectedModelfile.title.slice(1)
												  }`
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												: `${model}`,
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											{
												body: responseMessage.content,
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												icon: selectedModelfile?.imageUrl ?? `${WEBUI_BASE_URL}/static/favicon.png`
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											}
										);
									}

									if ($settings.responseAutoCopy) {
										copyToClipboard(responseMessage.content);
									}
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									if ($settings.responseAutoPlayback) {
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										await tick();
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										document.getElementById(`speak-button-${responseMessage.id}`)?.click();
									}
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								}
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							}
						}
					}
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				} catch (error) {
					console.log(error);
					if ('detail' in error) {
						toast.error(error.detail);
					}
					break;
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				}
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				if (autoScroll) {
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					scrollToBottom();
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				}
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			}
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			if ($chatId == _chatId) {
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				if ($settings.saveChatHistory ?? true) {
					chat = await updateChatById(localStorage.token, _chatId, {
						messages: messages,
						history: history
					});
					await chats.set(await getChatList(localStorage.token));
				}
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			}
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		} else {
			if (res !== null) {
				const error = await res.json();
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				console.log(error);
				if ('detail' in error) {
					toast.error(error.detail);
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					responseMessage.content = error.detail;
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				} else {
					toast.error(error.error);
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					responseMessage.content = error.error;
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				}
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			} else {
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				toast.error(
					$i18n.t(`Uh-oh! There was an issue connecting to {{provider}}.`, { provider: 'Ollama' })
				);
				responseMessage.content = $i18n.t(`Uh-oh! There was an issue connecting to {{provider}}.`, {
					provider: 'Ollama'
				});
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			}

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			responseMessage.error = true;
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			responseMessage.content = $i18n.t(`Uh-oh! There was an issue connecting to {{provider}}.`, {
				provider: 'Ollama'
			});
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			responseMessage.done = true;
			messages = messages;
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		}

		stopResponseFlag = false;
		await tick();
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		if (autoScroll) {
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			scrollToBottom();
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		}

		if (messages.length == 2 && messages.at(1).content !== '') {
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			window.history.replaceState(history.state, '', `/c/${_chatId}`);
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			const _title = await generateChatTitle(userPrompt);
			await setChatTitle(_chatId, _title);
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		}
	};

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	const sendPromptOpenAI = async (model, userPrompt, responseMessageId, _chatId) => {
		const responseMessage = history.messages[responseMessageId];
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		const docs = messages
			.filter((message) => message?.files ?? null)
			.map((message) =>
				message.files.filter((item) => item.type === 'doc' || item.type === 'collection')
			)
			.flat(1);

		console.log(docs);

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		scrollToBottom();

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		const [res, controller] = await generateOpenAIChatCompletion(
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			localStorage.token,
			{
				model: model.id,
				stream: true,
				messages: [
					$settings.system
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						? {
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								role: 'system',
								content: $settings.system
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						  }
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						: undefined,
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					...messages
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				]
					.filter((message) => message)
					.map((message, idx, arr) => ({
						role: message.role,
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						...((message.files?.filter((file) => file.type === 'image').length > 0 ?? false) &&
						message.role === 'user'
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							? {
									content: [
										{
											type: 'text',
											text:
												arr.length - 1 !== idx
													? message.content
													: message?.raContent ?? message.content
										},
										...message.files
											.filter((file) => file.type === 'image')
											.map((file) => ({
												type: 'image_url',
												image_url: {
													url: file.url
												}
											}))
									]
							  }
							: {
									content:
										arr.length - 1 !== idx ? message.content : message?.raContent ?? message.content
							  })
					})),
				seed: $settings?.options?.seed ?? undefined,
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				stop:
					$settings?.options?.stop ?? undefined
						? $settings.options.stop.map((str) =>
								decodeURIComponent(JSON.parse('"' + str.replace(/\"/g, '\\"') + '"'))
						  )
						: undefined,
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				temperature: $settings?.options?.temperature ?? undefined,
				top_p: $settings?.options?.top_p ?? undefined,
				num_ctx: $settings?.options?.num_ctx ?? undefined,
				frequency_penalty: $settings?.options?.repeat_penalty ?? undefined,
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				max_tokens: $settings?.options?.num_predict ?? undefined,
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				docs: docs.length > 0 ? docs : undefined,
				citations: docs.length > 0
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			},
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			model?.source?.toLowerCase() === 'litellm'
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				? `${LITELLM_API_BASE_URL}/v1`
				: `${OPENAI_API_BASE_URL}`
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		);
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		// Wait until history/message have been updated
		await tick();

		scrollToBottom();

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		if (res && res.ok && res.body) {
			const textStream = await createOpenAITextStream(res.body, $settings.splitLargeChunks);
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			for await (const update of textStream) {
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				const { value, done, citations } = update;
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				if (done || stopResponseFlag || _chatId !== $chatId) {
					responseMessage.done = true;
					messages = messages;
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					if (stopResponseFlag) {
						controller.abort('User: Stop Response');
					}

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					break;
				}
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				if (citations) {
					responseMessage.citations = citations;
					continue;
				}

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				if (responseMessage.content == '' && value == '\n') {
					continue;
				} else {
					responseMessage.content += value;
					messages = messages;
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				}
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				if ($settings.notificationEnabled && !document.hasFocus()) {
					const notification = new Notification(`OpenAI ${model}`, {
						body: responseMessage.content,
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						icon: `${WEBUI_BASE_URL}/static/favicon.png`
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					});
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				}

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				if ($settings.responseAutoCopy) {
					copyToClipboard(responseMessage.content);
				}
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				if ($settings.responseAutoPlayback) {
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					await tick();
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					document.getElementById(`speak-button-${responseMessage.id}`)?.click();
				}

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				if (autoScroll) {
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					scrollToBottom();
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				}
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			}
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			if ($chatId == _chatId) {
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				if ($settings.saveChatHistory ?? true) {
					chat = await updateChatById(localStorage.token, _chatId, {
						messages: messages,
						history: history
					});
					await chats.set(await getChatList(localStorage.token));
				}
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			}
		} else {
			if (res !== null) {
				const error = await res.json();
				console.log(error);
				if ('detail' in error) {
					toast.error(error.detail);
					responseMessage.content = error.detail;
				} else {
					if ('message' in error.error) {
						toast.error(error.error.message);
						responseMessage.content = error.error.message;
					} else {
						toast.error(error.error);
						responseMessage.content = error.error;
					}
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				}
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			} else {
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				toast.error(
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					$i18n.t(`Uh-oh! There was an issue connecting to {{provider}}.`, {
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						provider: model.custom_info?.displayName ?? model.name ?? model.id
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					})
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				);
				responseMessage.content = $i18n.t(`Uh-oh! There was an issue connecting to {{provider}}.`, {
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					provider: model.custom_info?.displayName ?? model.name ?? model.id
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				});
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			}
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			responseMessage.error = true;
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			responseMessage.content = $i18n.t(`Uh-oh! There was an issue connecting to {{provider}}.`, {
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				provider: model.custom_info?.displayName ?? model.name ?? model.id
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			});
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			responseMessage.done = true;
			messages = messages;
		}

		stopResponseFlag = false;
		await tick();

		if (autoScroll) {
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			scrollToBottom();
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		}

		if (messages.length == 2) {
			window.history.replaceState(history.state, '', `/c/${_chatId}`);
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			const _title = await generateChatTitle(userPrompt);
			await setChatTitle(_chatId, _title);
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		}
	};
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	const stopResponse = () => {
		stopResponseFlag = true;
		console.log('stopResponse');
	};

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	const regenerateResponse = async () => {
		console.log('regenerateResponse');
		if (messages.length != 0 && messages.at(-1).done == true) {
			messages.splice(messages.length - 1, 1);
			messages = messages;

			let userMessage = messages.at(-1);
			let userPrompt = userMessage.content;

			await sendPrompt(userPrompt, userMessage.id);
		}
	};

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	const continueGeneration = async () => {
		console.log('continueGeneration');
		const _chatId = JSON.parse(JSON.stringify($chatId));

		if (messages.length != 0 && messages.at(-1).done == true) {
			const responseMessage = history.messages[history.currentId];
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			responseMessage.done = false;
			await tick();

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			const model = $models.filter((m) => m.id === responseMessage.model).at(0);

			if (model) {
				if (model?.external) {
					await sendPromptOpenAI(
						model,
						history.messages[responseMessage.parentId].content,
						responseMessage.id,
						_chatId
					);
				} else
					await sendPromptOllama(
						model,
						history.messages[responseMessage.parentId].content,
						responseMessage.id,
						_chatId
					);
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			}
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		} else {
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			toast.error($i18n.t(`Model {{modelId}} not found`, { modelId }));
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		}
	};

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	const generateChatTitle = async (userPrompt) => {
		if ($settings?.title?.auto ?? true) {
			const model = $models.find((model) => model.id === selectedModels[0]);
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			const titleModelId =
				model?.external ?? false
					? $settings?.title?.modelExternal ?? selectedModels[0]
					: $settings?.title?.model ?? selectedModels[0];
			const titleModel = $models.find((model) => model.id === titleModelId);
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			console.log(titleModel);
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			const title = await generateTitle(
				localStorage.token,
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				$settings?.title?.prompt ??
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					$i18n.t(
						"Create a concise, 3-5 word phrase as a header for the following query, strictly adhering to the 3-5 word limit and avoiding the use of the word 'title':"
					) + ' {{prompt}}',
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				titleModelId,
				userPrompt,
				titleModel?.external ?? false
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					? titleModel?.source?.toLowerCase() === 'litellm'
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						? `${LITELLM_API_BASE_URL}/v1`
						: `${OPENAI_API_BASE_URL}`
					: `${OLLAMA_API_BASE_URL}/v1`
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			);
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			return title;
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		} else {
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			return `${userPrompt}`;
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		}
	};

	const setChatTitle = async (_chatId, _title) => {
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		if (_chatId === $chatId) {
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			title = _title;
		}
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		if ($settings.saveChatHistory ?? true) {
			chat = await updateChatById(localStorage.token, _chatId, { title: _title });
			await chats.set(await getChatList(localStorage.token));
		}
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	};
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	const getTags = async () => {
		return await getTagsById(localStorage.token, $chatId).catch(async (error) => {
			return [];
		});
	};

	const addTag = async (tagName) => {
		const res = await addTagById(localStorage.token, $chatId, tagName);
		tags = await getTags();
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		chat = await updateChatById(localStorage.token, $chatId, {
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			tags: tags
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		});
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		_tags.set(await getAllChatTags(localStorage.token));
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	};

	const deleteTag = async (tagName) => {
		const res = await deleteTagById(localStorage.token, $chatId, tagName);
		tags = await getTags();
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		chat = await updateChatById(localStorage.token, $chatId, {
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			tags: tags
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		});
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		_tags.set(await getAllChatTags(localStorage.token));
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	};

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	onMount(async () => {
		if (!($settings.saveChatHistory ?? true)) {
			await goto('/');
		}
	});
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</script>

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<svelte:head>
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	<title>
		{title
			? `${title.length > 30 ? `${title.slice(0, 30)}...` : title} | ${$WEBUI_NAME}`
			: `${$WEBUI_NAME}`}
	</title>
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</svelte:head>

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{#if loaded}
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	<div
		class="min-h-screen max-h-screen {$showSidebar
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			? 'lg:max-w-[calc(100%-260px)]'
			: ''} w-full max-w-full flex flex-col"
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	>
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		<Navbar
			{title}
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			{chat}
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			bind:selectedModels
			bind:showModelSelector
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			shareEnabled={messages.length > 0}
			initNewChat={async () => {
				if (currentRequestId !== null) {
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					await cancelOllamaRequest(localStorage.token, currentRequestId);
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					currentRequestId = null;
				}
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				goto('/');
			}}
		/>
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		<div class="flex flex-col flex-auto">
			<div
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				class=" pb-2.5 flex flex-col justify-between w-full flex-auto overflow-auto h-0 max-w-full"
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				id="messages-container"
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				bind:this={messagesContainerElement}
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				on:scroll={(e) => {
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					autoScroll =
						messagesContainerElement.scrollHeight - messagesContainerElement.scrollTop <=
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						messagesContainerElement.clientHeight + 5;
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				}}
			>
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				<div class=" h-full w-full flex flex-col py-4">
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					<Messages
						chatId={$chatId}
						{selectedModels}
						{selectedModelfiles}
						{processing}
						bind:history
						bind:messages
						bind:autoScroll
						bottomPadding={files.length > 0}
						{sendPrompt}
						{continueGeneration}
						{regenerateResponse}
					/>
				</div>
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			</div>
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		</div>
	</div>
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	<MessageInput
		bind:files
		bind:prompt
		bind:autoScroll
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		bind:selectedModel={atSelectedModel}
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		suggestionPrompts={selectedModelfile?.suggestionPrompts ?? $config.default_prompt_suggestions}
		{messages}
		{submitPrompt}
		{stopResponse}
	/>
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{/if}