ai.lua
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ai.lua
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	--[[
	mattata v2.0 - AI Plugin
	AI-powered chat using OpenAI or Anthropic API.
	Must be enabled via AI_ENABLED=true in configuration.
	]]

	local plugin = {}
	plugin.name = 'ai'
	plugin.category = 'ai'
	plugin.description = 'Chat with an AI assistant'
	plugin.commands = { 'ai', 'ask' }
	plugin.help = '/ai <prompt> - Send a prompt to the AI assistant and receive a response.'

	local MAX_HISTORY = 10
	local SYSTEM_PROMPT = 'You are a helpful assistant embedded in a Telegram bot called mattata. '
	.. 'Be concise and direct in your responses. '
	.. 'Use Telegram-compatible formatting (bold, italic, code) when helpful.'

	-- Build a Redis key for conversation history
	local function history_key(chat_id, user_id)
	return string.format('ai:history:%s:%s', tostring(chat_id), tostring(user_id))
	end

	-- Retrieve recent conversation history from Redis
	local function get_history(redis, chat_id, user_id)
	local json = require('dkjson')
	local key = history_key(chat_id, user_id)
	local raw = redis.lrange(key, 0, MAX_HISTORY * 2 - 1)
	local messages = {}
	if raw and #raw > 0 then
	for _, entry in ipairs(raw) do
	local msg = json.decode(entry)
	if msg then
	table.insert(messages, msg)
	end
	end
	end
	return messages
	end

	-- Append a message to conversation history
	local function push_history(redis, chat_id, user_id, role, content)
	local json = require('dkjson')
	local key = history_key(chat_id, user_id)
	redis.rpush(key, json.encode({ role = role, content = content }))
	-- Trim to keep only recent messages
	redis.ltrim(key, -(MAX_HISTORY * 2), -1)
	-- Auto-expire after 1 hour of inactivity
	redis.expire(key, 3600)
	end

	-- Call OpenAI Chat Completions API
	local function call_openai(api_key, model, messages)
	local http = require('src.core.http')
	local json = require('dkjson')

	local request_body = json.encode({
	model = model,
	messages = messages,
	max_tokens = 1024
	})

	local body, code = http.post('https://api.openai.com/v1/chat/completions', request_body, 'application/json', {
	['Authorization'] = 'Bearer ' .. api_key
	})

	if code ~= 200 then
	return nil, 'OpenAI API request failed (HTTP ' .. tostring(code) .. ').'
	end

	local data = json.decode(body)
	if not data or not data.choices or #data.choices == 0 then
	return nil, 'No response from OpenAI.'
	end

	return data.choices[1].message and data.choices[1].message.content or nil
	end

	-- Call Anthropic Messages API
	local function call_anthropic(api_key, model, messages)
	local http = require('src.core.http')
	local json = require('dkjson')

	-- Convert from OpenAI message format; extract system prompt
	local system_text = nil
	local api_messages = {}
	for _, msg in ipairs(messages) do
	if msg.role == 'system' then
	system_text = msg.content
	else
	table.insert(api_messages, { role = msg.role, content = msg.content })
	end
	end

	local request_body = json.encode({
	model = model,
	max_tokens = 1024,
	system = system_text or SYSTEM_PROMPT,
	messages = api_messages
	})

	local body, code = http.post('https://api.anthropic.com/v1/messages', request_body, 'application/json', {
	['x-api-key'] = api_key,
	['anthropic-version'] = '2023-06-01'
	})

	if code ~= 200 then
	return nil, 'Anthropic API request failed (HTTP ' .. tostring(code) .. ').'
	end

	local data = json.decode(body)
	if not data or not data.content or #data.content == 0 then
	return nil, 'No response from Anthropic.'
	end

	return data.content[1].text
	end

	-- Main dispatch: pick provider and call
	local function get_ai_response(ai_config, messages)
	if ai_config.anthropic_key then
	return call_anthropic(ai_config.anthropic_key, ai_config.anthropic_model, messages)
	elseif ai_config.openai_key then
	return call_openai(ai_config.openai_key, ai_config.openai_model, messages)
	end
	return nil, 'No AI API key has been configured.'
	end

	function plugin.on_message(api, message, ctx)
	local ai_config = ctx.config.ai()
	if not ai_config.enabled then
	return api.send_message(message.chat.id, 'The AI feature is currently disabled.')
	end

	local input = message.args
	-- If replying to a message, prepend the quoted text for context
	if (not input or input == '') and message.reply and message.reply.text and message.reply.text ~= '' then
	input = message.reply.text
	end

	if not input or input == '' then
	return api.send_message(message.chat.id, 'Please provide a prompt, e.g. <code>/ai What is the capital of France?</code>', { parse_mode = 'html' })
	end

	-- Send typing action while processing
	api.send_chat_action(message.chat.id, 'typing')

	-- Build message history
	local history = get_history(ctx.redis, message.chat.id, message.from.id)
	local messages = {
	{ role = 'system', content = SYSTEM_PROMPT }
	}
	for _, msg in ipairs(history) do
	table.insert(messages, msg)
	end
	table.insert(messages, { role = 'user', content = input })

	local response, err = get_ai_response(ai_config, messages)
	if not response then
	return api.send_message(message.chat.id, err or 'Failed to get a response from the AI.')
	end

	-- Store conversation turn
	push_history(ctx.redis, message.chat.id, message.from.id, 'user', input)
	push_history(ctx.redis, message.chat.id, message.from.id, 'assistant', response)

	-- Truncate if response exceeds Telegram's 4096 character limit
	if #response > 4096 then
	response = response:sub(1, 4090) .. '\n...'
	end

	return api.send_message(message.chat.id, response, { link_preview_options = { is_disabled = true }, reply_parameters = { message_id = message.message_id } })
	end

	-- Respond to @mentions and DMs passively if AI is enabled
	function plugin.on_new_message(api, message, ctx)
	local ai_config = ctx.config.ai()
	if not ai_config.enabled then
	return
	end

	-- Skip if this was already handled as a command
	if message.text and message.text:match('^[/!#]') then
	return
	end

	local text = message.text or ''
	local is_mention = false
	local is_dm = message.chat and message.chat.type == 'private'

	-- Check for @bot_username mentions in entities
	if message.entities then
	for _, entity in ipairs(message.entities) do
	if entity.type == 'mention' then
	local mention = text:sub(entity.offset + 1, entity.offset + entity.length)
	if mention:lower() == '@' .. api.info.username:lower() then
	is_mention = true
	-- Strip the mention from the input
	text = text:sub(1, entity.offset) .. text:sub(entity.offset + entity.length + 1)
	text = text:match('^%s(.-)%s$') -- trim
	break
	end
	end
	end
	end

	if not is_mention and not is_dm then
	return
	end

	if text == '' then
	return
	end

	-- Send typing action
	api.send_chat_action(message.chat.id, 'typing')

	local history = get_history(ctx.redis, message.chat.id, message.from.id)
	local messages = {
	{ role = 'system', content = SYSTEM_PROMPT }
	}
	for _, msg in ipairs(history) do
	table.insert(messages, msg)
	end
	table.insert(messages, { role = 'user', content = text })

	local response, _ = get_ai_response(ai_config, messages)
	if not response then
	return
	end

	push_history(ctx.redis, message.chat.id, message.from.id, 'user', text)
	push_history(ctx.redis, message.chat.id, message.from.id, 'assistant', response)

	if #response > 4096 then
	response = response:sub(1, 4090) .. '\n...'
	end

	return api.send_message(message.chat.id, response, { link_preview_options = { is_disabled = true }, reply_parameters = { message_id = message.message_id } })
	end

	return plugin

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