import './style2.css'

const BACKENDS = {
	plato : {
		prod: '/api/plato',
		dev : 'http://192.168.1.74:8080/v1',
		name: 'Plato (192.168.1.74)'
	},
	stoic : {
		prod: '/api/stoic',
		dev : 'http://192.168.1.159:1234/v1',
		name: 'Stoic (192.168.1.159)'
	},
	ollama: {
		prod: '/api/ollama',
		dev : 'http://192.168.1.159:8081/v1',
		name: 'Ollama (192.168.1.159:8081)'
	}
}
const IS_PRODUCTION = window.location.hostname === 'jarvis-lan.appmodel.nl'
const API_KEY = 'not-needed'
const MAX_CHAT_HISTORY = 50

let currentBackendModel = null
let availableBackendModels = []
let currentStreamController = null
let isStreaming = false
let chatHistory = JSON.parse(localStorage.getItem('chatHistory')) || []

// ✅ FIX: Generate unique IDs and validate message structure
chatHistory = chatHistory.map((message, index) => ({
	role     : message.role || 'user',
	content  : message.content || '',
	markdown : message.markdown || false,
	messageId: message.messageId || `msg-${ Date.now() }-${ index }`
})).filter(msg => msg.content && typeof msg.content === 'string')

const welcomeMessage = `# Welcome to LM Studio Chat!

I now support **full conversation history**, **real-time streaming responses** and **dark, readable text formatting**.

## Features:
1. **Full Chat History** - Complete conversation context is now sent to the AI
2. **Smart History Management** - Automatically keeps the last ${ MAX_CHAT_HISTORY } messages
3. **Streaming Mode** (enabled by default) - Watch responses appear word-by-word
4. **Markdown Rendering** - Proper formatting for code, lists, tables, and more
5. **Readable Dark Text** - No more eye strain from light gray text

## Try it out:
- Ask follow-up questions that reference earlier messages
- Have a multi-turn conversation with full context
- Ask "what did I just ask?" to test history retention
- Watch the streaming response in real-time!

> *Tip: You can toggle streaming and markdown using the checkboxes below.*`

// ✅ NEW: Robust parser for backend:model format
function splitBackendModel(value) {
	if (!value || value === ':') {
		return { backendKey: '', model: '' }
	}

	const colonIndex = value.indexOf(':')
	if (colonIndex === -1) {
		return { backendKey: value, model: '' }
	}

	return {
		backendKey: value.substring(0, colonIndex),
		model     : value.substring(colonIndex + 1)
	}
}

function getApiUrl() {
	const { backendKey, model } = splitBackendModel(currentBackendModel)
	const effectiveBackendKey = backendKey || 'plato'
	const backend = BACKENDS[effectiveBackendKey]

	if (!backend) {
		throw new Error(`Invalid backend: '${ effectiveBackendKey }'`)
	}

	return IS_PRODUCTION ? backend.prod : backend.dev
}

function updateBackendModelDisplay() {
	const { backendKey, model } = splitBackendModel(currentBackendModel)
	const backend = BACKENDS[backendKey]
	if (!backend) return

	const displayText = IS_PRODUCTION
		? `${ backend.prod } - ${ backend.name }`
		: backend.dev
	const displayElement = document.getElementById('backendDisplay')
	if (displayElement) {
		displayElement.textContent = `${ displayText } - Model: ${ model || 'None' }`
	}
}

async function fetchBackendModels() {
	const selector = document.getElementById('backendModelSelector')
	let allModels = []

	for (const [backendKey, backendConfig] of Object.entries(BACKENDS)) {
		try {
			const apiUrl = IS_PRODUCTION ? backendConfig.prod : backendConfig.dev
			console.log(`Fetching models from ${ backendKey }: ${ apiUrl }`)

			const response = await fetch(`${ apiUrl }/models`, {
				signal: AbortSignal.timeout(5000) // 5 second timeout
			})

			if (response.ok) {
				const data = await response.json()
				if (data.data && Array.isArray(data.data)) {
					const models = data.data.map(model => ({
						backend: backendKey,
						model  : model.id
					}))
					allModels = [...allModels, ...models]
				}
			} else {
				console.error(`Failed to fetch models from ${ backendKey }: ${ response.status } ${ response.statusText }`)
			}
		} catch (error) {
			console.error(`Error fetching models from ${ backendKey }:`, error)
		}
	}

	availableBackendModels = allModels

	if (selector) {
		if (availableBackendModels.length === 0) {
			selector.innerHTML = '<option value="">No models available (check backends)</option>'
		} else {
			populateBackendModelSelector()

			// Auto-select if no valid model is set
			const hasModel = currentBackendModel && currentBackendModel.includes(':') && currentBackendModel.split(':')[1]
			if (!hasModel && availableBackendModels.length > 0) {
				currentBackendModel = `${ availableBackendModels[0].backend }:${ availableBackendModels[0].model }`
				selector.value = currentBackendModel
			}
		}
	}

	updateBackendModelDisplay()
}

function populateBackendModelSelector() {
	const selector = document.getElementById('backendModelSelector')
	if (!selector) return

	if (availableBackendModels.length === 0) {
		selector.innerHTML = '<option value="">No models available</option>'
		return
	}

	selector.innerHTML = availableBackendModels.map(backendModel =>
		`<option value="${ backendModel.backend }:${ backendModel.model }">${ BACKENDS[backendModel.backend].name } - ${ backendModel.model }</option>`
	).join('')

	if (currentBackendModel && selector.querySelector(`option[value="${ currentBackendModel }"]`)) {
		selector.value = currentBackendModel
	} else if (availableBackendModels.length > 0) {
		// If current selection is invalid, reset to first available
		currentBackendModel = `${ availableBackendModels[0].backend }:${ availableBackendModels[0].model }`
		selector.value = currentBackendModel
	}
}

function getApiMessages() {
	return chatHistory.slice(-MAX_CHAT_HISTORY).map(({ role, content }) => ({
		role,
		content
	}))
}

function trimChatHistory() {
	if (chatHistory.length > MAX_CHAT_HISTORY) {
		chatHistory = chatHistory.slice(-MAX_CHAT_HISTORY)
		localStorage.setItem('chatHistory', JSON.stringify(chatHistory))
	}
}

document.addEventListener('DOMContentLoaded', () => {
	const backendModelSelector = document.getElementById('backendModelSelector')

	if (backendModelSelector) {
		backendModelSelector.addEventListener('change', (e) => {
			currentBackendModel = e.target.value
			updateBackendModelDisplay()
			fetchBackendModels()
		})
	}
})

const chatLog = document.getElementById('chatLog')
const userInput = document.getElementById('userInput')
const sendBtn = document.getElementById('sendBtn')
const streamToggle = document.getElementById('streamToggle')
const markdownToggle = document.getElementById('markdownToggle')
const modelNameSpan = document.getElementById('modelName')

marked.setOptions({
	gfm      : true,
	breaks   : true,
	highlight: function(code, lang) {
		if (window.hljs) {
			const language = hljs.getLanguage(lang) ? lang : 'plaintext'
			return hljs.highlight(code, { language }).value
		}
		return code
	}
})

window.autoResize = function autoResize(textarea) {
	textarea.style.height = 'auto'
	textarea.style.height = Math.min(textarea.scrollHeight, 300) + 'px'
}

function addMessage(role, content, markdown = false, messageId = null, saveToHistory = true) {
	const messageDiv = document.createElement('div')
	messageDiv.className = `message message-${ role }`
	if (messageId) {
		messageDiv.id = messageId
	}

	const headerDiv = document.createElement('div')
	headerDiv.className = `message-header ${ role }`

	const avatar = document.createElement('div')
	avatar.className = `avatar ${ role }-avatar`
	avatar.textContent = role === 'user' ? '👤' : '🤖'

	const name = document.createElement('span')
	name.textContent = role === 'user' ? 'You' : 'Assistant'

	headerDiv.appendChild(avatar)
	headerDiv.appendChild(name)

	const contentDiv = document.createElement('div')

	if (markdown && role === 'assistant' && markdownToggle.checked) {
		contentDiv.className = 'markdown-content'
		const processedContent = parseThinkingTags(content)
		contentDiv.innerHTML = marked.parse(processedContent)
		if (window.hljs) {
			setTimeout(() => {
				contentDiv.querySelectorAll('pre code').forEach((block) => {
					hljs.highlightElement(block)
				})
			}, 0)
		}
	} else {
		const processedContent = parseThinkingTags(content)
		contentDiv.innerHTML = processedContent
		contentDiv.style.whiteSpace = 'pre-wrap'
		contentDiv.style.padding = '8px 0'
		contentDiv.style.color = '#e0e0e0'
	}

	messageDiv.appendChild(headerDiv)
	messageDiv.appendChild(contentDiv)
	if (chatLog) {
		chatLog.appendChild(messageDiv)
		chatLog.scrollTop = chatLog.scrollHeight
	}

	if (saveToHistory) {
		chatHistory.push({ role, content, markdown, messageId })
		trimChatHistory()
		localStorage.setItem('chatHistory', JSON.stringify(chatHistory))
	}

	return contentDiv
}

function parseThinkingTags(content) {
	let result = content
	let thinkingCounter = 0

	const completeThinkRegex = /\[THINK\]([\s\S]*?)\[\/THINK\]/gi
	result = result.replace(completeThinkRegex, (match, thinkContent) => {
		thinkingCounter++
		const id = `thinking-${ Date.now() }-${ thinkingCounter }`
		return `<div class="thinking-block">
			<div class="thinking-header" onclick="toggleThinking('${ id }')">
				<span class="thinking-toggle" id="${ id }-toggle">?</span>
				<span>? Thinking...</span>
			</div>
			<div class="thinking-content" id="${ id }">${ thinkContent.trim() }</div>
		</div>`
	})

	const incompleteThinkRegex = /\[THINK\]([\s\S]*?)$/gi
	result = result.replace(incompleteThinkRegex, (match, thinkContent) => {
		thinkingCounter++
		const id = `thinking-${ Date.now() }-${ thinkingCounter }`
		return `<div class="thinking-block">
			<div class="thinking-header" onclick="toggleThinking('${ id }')">
				<span class="thinking-toggle" id="${ id }-toggle">?</span>
				<span>? Thinking...</span>
			</div>
			<div class="thinking-content" id="${ id }">${ thinkContent.trim() }</div>
		</div>`
	})

	return result
}

window.toggleThinking = function(id) {
	const content = document.getElementById(id)
	const toggle = document.getElementById(id + '-toggle')

	if (content && toggle) {
		content.classList.toggle('hidden')
		toggle.classList.toggle('collapsed')
	}
}

function updateMessageContent(contentDiv, newContent, markdown = false, role) {
	const processedContent = parseThinkingTags(newContent)

	if (markdown && role === 'assistant' && markdownToggle && markdownToggle.checked) {
		contentDiv.innerHTML = marked.parse(processedContent)
		if (window.hljs) {
			setTimeout(() => {
				contentDiv.querySelectorAll('pre code').forEach((block) => {
					hljs.highlightElement(block)
				})
			}, 0)
		}
	} else {
		contentDiv.innerHTML = processedContent
		contentDiv.style.whiteSpace = 'pre-wrap'
		contentDiv.style.padding = '8px 0'
		contentDiv.style.color = '#e0e0e0'
	}
	if (chatLog) {
		chatLog.scrollTop = chatLog.scrollHeight
	}
}

function showTypingIndicator() {
	const typingDiv = document.createElement('div')
	typingDiv.id = 'typingIndicator'
	typingDiv.className = 'message message-assistant'

	const headerDiv = document.createElement('div')
	headerDiv.className = 'message-header assistant'

	const avatar = document.createElement('div')
	avatar.className = 'avatar assistant-avatar'
	avatar.textContent = '🤖'

	const name = document.createElement('span')
	name.textContent = 'Assistant'

	headerDiv.appendChild(avatar)
	headerDiv.appendChild(name)

	const dotsDiv = document.createElement('div')
	dotsDiv.className = 'typing-indicator'
	dotsDiv.innerHTML = `
        <div class="typing-dot"></div>
        <div class="typing-dot"></div>
        <div class="typing-dot"></div>
        <span style="margin-left: 8px;">Thinking...</span>
    `

	typingDiv.appendChild(headerDiv)
	typingDiv.appendChild(dotsDiv)
	if (chatLog) {
		chatLog.appendChild(typingDiv)
		chatLog.scrollTop = chatLog.scrollHeight
	}

	return typingDiv
}

function removeTypingIndicator(typingDiv) {
	if (typingDiv && typingDiv.parentNode) {
		typingDiv.parentNode.removeChild(typingDiv)
	}
}

async function handleStreamingResponse(userMessage) {
	const messageId = 'msg-' + Date.now()
	let accumulatedContent = ''
	let contentDiv = null

	const messageDiv = document.createElement('div')
	messageDiv.className = 'message message-assistant'
	messageDiv.id = messageId

	const headerDiv = document.createElement('div')
	headerDiv.className = 'message-header assistant'

	const avatar = document.createElement('div')
	avatar.className = 'avatar assistant-avatar'
	avatar.textContent = '🤖'

	const name = document.createElement('span')
	name.textContent = 'Assistant'

	headerDiv.appendChild(avatar)
	headerDiv.appendChild(name)

	contentDiv = document.createElement('div')
	contentDiv.className = 'markdown-content'

	messageDiv.appendChild(headerDiv)
	messageDiv.appendChild(contentDiv)
	if (chatLog) {
		chatLog.appendChild(messageDiv)
	}

	const cursorSpan = document.createElement('span')
	cursorSpan.className = 'streaming-cursor'
	contentDiv.appendChild(cursorSpan)

	// ✅ FIX: Create AbortController BEFORE fetch
	currentStreamController = new AbortController()
	isStreaming = true

	try {
		const { backendKey, model } = splitBackendModel(currentBackendModel)
		const selectedModel = model || availableBackendModels[0]?.model || 'local-model'

		const requestBody = {
			model         : selectedModel,
			messages      : getApiMessages(),
			stream        : true,
			temperature   : 0.7,
			repeat_penalty: 1.1,
			max_tokens    : 2000
		}

		const response = await fetch(`${ getApiUrl() }/chat/completions`, {
			method : 'POST',
			headers: {
				'Content-Type' : 'application/json',
				'Authorization': `Bearer ${ API_KEY }`
			},
			body   : JSON.stringify(requestBody),
			signal : currentStreamController.signal  // ✅ Now works correctly
		})

		if (!response.ok) {
			throw new Error(`API Error: ${ response.status } ${ response.statusText }`)
		}

		const reader = response.body.getReader()
		const decoder = new TextDecoder()

		let updateScheduled = false
		let lastUpdate = Date.now()
		const MIN_UPDATE_INTERVAL = 100

		function scheduleUpdate() {
			if (updateScheduled) return

			const now = Date.now()
			const timeSinceLastUpdate = now - lastUpdate

			if (timeSinceLastUpdate >= MIN_UPDATE_INTERVAL) {
				updateScheduled = true
				requestAnimationFrame(() => {
					updateMessageContent(contentDiv, accumulatedContent, markdownToggle && markdownToggle.checked, 'assistant')
					if (cursorSpan.parentNode) {
						contentDiv.appendChild(cursorSpan)
					}
					if (chatLog) {
						chatLog.scrollTop = chatLog.scrollHeight
					}
					lastUpdate = Date.now()
					updateScheduled = false
				})
			} else {
				updateScheduled = true
				setTimeout(() => {
					requestAnimationFrame(() => {
						updateMessageContent(contentDiv, accumulatedContent, markdownToggle && markdownToggle.checked, 'assistant')
						if (cursorSpan.parentNode) {
							contentDiv.appendChild(cursorSpan)
						}
						if (chatLog) {
							chatLog.scrollTop = chatLog.scrollHeight
						}
						lastUpdate = Date.now()
						updateScheduled = false
					})
				}, MIN_UPDATE_INTERVAL - timeSinceLastUpdate)
			}
		}

		while (true) {
			const { done, value } = await reader.read()
			if (done) break

			const chunk = decoder.decode(value)
			const lines = chunk.split('\n').filter(line => line.trim() !== '')

			for (const line of lines) {
				if (line.startsWith('data: ')) {
					const data = line.slice(6)

					if (data === '[DONE]') {
						isStreaming = false
						currentStreamController = null
						updateMessageContent(contentDiv, accumulatedContent, markdownToggle.checked, 'assistant')
						if (cursorSpan.parentNode) {
							cursorSpan.parentNode.removeChild(cursorSpan)
						}
						chatLog.scrollTop = chatLog.scrollHeight
						return
					}

					try {
						const parsed = JSON.parse(data)
						if (parsed.choices && parsed.choices[0].delta.content) {
							accumulatedContent += parsed.choices[0].delta.content
							scheduleUpdate()
						}
					} catch (e) {
						console.log('Error parsing stream data:', e)
					}
				}
			}
		}

		updateMessageContent(contentDiv, accumulatedContent, markdownToggle.checked, 'assistant')
		chatLog.scrollTop = chatLog.scrollHeight

	} catch (error) {
		console.error('Streaming error:', error)
		if (error.name !== 'AbortError') {
			updateMessageContent(contentDiv, `Error: ${ error.message }`, false, 'assistant')
		}
	} finally {
		isStreaming = false
		currentStreamController = null
		sendBtn.disabled = false

		if (cursorSpan && cursorSpan.parentNode) {
			cursorSpan.parentNode.removeChild(cursorSpan)
		}
	}
}

async function handleNonStreamingResponse(userMessage) {
	let typingIndicator = null
	try {
		typingIndicator = showTypingIndicator()

		const { backendKey, model } = splitBackendModel(currentBackendModel)
		const selectedModel = model || availableBackendModels[0]?.model || 'local-model'

		const requestBody = {
			model         : selectedModel,
			messages      : getApiMessages(),
			stream        : false,
			temperature   : 0.7,
			repeat_penalty: 1.1,
			max_tokens    : 2000
		}

		const response = await fetch(`${ getApiUrl() }/chat/completions`, {
			method : 'POST',
			headers: {
				'Content-Type' : 'application/json',
				'Authorization': `Bearer ${ API_KEY }`
			},
			body   : JSON.stringify(requestBody)
		})

		if (!response.ok) {
			throw new Error(`API Error: ${ response.status } ${ response.statusText }`)
		}

		const data = await response.json()
		removeTypingIndicator(typingIndicator)

		if (data.choices && data.choices.length > 0) {
			const assistantReply = data.choices[0].message.content
			addMessage('assistant', assistantReply, markdownToggle.checked)
		} else {
			addMessage('assistant', 'No response generated.', false)
		}

	} catch (error) {
		console.error('Error:', error)
		if (typingIndicator) {
			removeTypingIndicator(typingIndicator)
		}
		addMessage('assistant', `Error: ${ error.message }`, false)
	} finally {
		sendBtn.disabled = false
		userInput.focus()
	}
}

function stopStream() {
	if (currentStreamController) {
		currentStreamController.abort()
		isStreaming = false
		currentStreamController = null
		sendBtn.disabled = false
		sendBtn.textContent = 'Send'
	}
}

async function sendMessage() {
	const userMessage = userInput.value.trim()
	if (!userMessage || isStreaming) return

	// ✅ FIX: Validate backend selection
	if (!currentBackendModel) {
		addMessage('assistant', 'Please select a backend model first.', false)
		return
	}

	addMessage('user', userMessage, false)

	userInput.value = ''
	userInput.style.height = 'auto'
	sendBtn.disabled = true

	if (streamToggle.checked) {
		sendBtn.textContent = 'Stop'
		await handleStreamingResponse(userMessage)
	} else {
		await handleNonStreamingResponse(userMessage)
	}

	sendBtn.textContent = 'Send'
}

sendBtn.addEventListener('click', () => {
	if (isStreaming) {
		stopStream()
	} else {
		sendMessage()
	}
})

userInput.addEventListener('keydown', (e) => {
	if (e.key === 'Enter' && !e.shiftKey) {
		e.preventDefault()
		if (!isStreaming) {
			sendMessage()
		}
	}
})

// ✅ Updated window.onload with better initialization
window.onload = () => {
	if (userInput) userInput.focus()

	// Set default backend BEFORE fetching
	if (!currentBackendModel) {
		currentBackendModel = 'plato'
	}

	fetchBackendModels().then(() => {
		// Load chat history after models are fetched
		if (chatLog) {
			if (chatHistory.length === 0) {
				//addMessage('assistant', welcomeMessage, true, null, false);
			} else {
				chatHistory.forEach(msg => {
					if (typeof msg.content === 'string' && msg.content.trim()) {
						addMessage(msg.role, msg.content, msg.markdown, msg.messageId, false)
					}
				})
			}
		}
	})

	document.getElementById('resetBtn')?.addEventListener('click', resetChat)
}

function resetChat() {
	chatHistory = []
	localStorage.setItem('chatHistory', JSON.stringify(chatHistory))

	if (chatLog) {
		chatLog.innerHTML = ''
		addMessage('assistant', welcomeMessage, true, null, false)
	}
}