addtrigger.lua
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addtrigger.lua
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	--[[
	mattata v2.0 - Add Trigger Plugin
	]]

	local plugin = {}
	plugin.name = 'addtrigger'
	plugin.category = 'admin'
	plugin.description = 'Add a trigger (auto-response pattern)'
	plugin.commands = { 'addtrigger', 'deltrigger' }
	plugin.help = '/addtrigger <pattern> <response> - Adds a trigger. Use /deltrigger <number> to remove.'
	plugin.group_only = true
	plugin.admin_only = true

	function plugin.on_message(api, message, ctx)
	local tools = require('telegram-bot-lua.tools')

	if not message.args then
	return api.send_message(message.chat.id,
	'Usage: /addtrigger <pattern> <response>\n\n'
	.. 'The pattern is a Lua pattern that will be matched against incoming messages. '
	.. 'When matched, the response is sent.')
	end

	-- if used with /deltrigger, handle deletion
	if message.command == 'deltrigger' then
	local index = tonumber(message.args)
	if not index then
	return api.send_message(message.chat.id, 'Usage: /deltrigger <number>')
	end
	local triggers = ctx.db.call('sp_get_triggers_ordered', { message.chat.id })
	if not triggers or not triggers[index] then
	return api.send_message(message.chat.id, 'Invalid trigger number. Use /triggers to see the list.')
	end
	ctx.db.call('sp_delete_trigger_by_id', { triggers[index].id })
	-- invalidate trigger cache
	require('src.core.session').invalidate_cached_list(message.chat.id, 'triggers')
	return api.send_message(message.chat.id, string.format(
	'Trigger <code>%s</code> has been removed.',
	tools.escape_html(triggers[index].pattern)
	), { parse_mode = 'html' })
	end

	-- parse pattern and response (split on first newline or first space after the pattern)
	local pattern, response
	if message.args:match('\n') then
	pattern, response = message.args:match('^(.-)%s\n%s(.+)$')
	else
	pattern, response = message.args:match('^(%S+)%s+(.+)$')
	end

	if not pattern or not response then
	return api.send_message(message.chat.id, 'Usage: /addtrigger <pattern> <response>')
	end

	pattern = pattern:match('^%s(.-)%s$')
	response = response:match('^%s(.-)%s$')

	-- validate pattern syntax
	local ok = pcall(string.match, '', pattern)
	if not ok then
	return api.send_message(message.chat.id, 'Invalid Lua pattern. Please check your syntax.')
	end

	-- reject patterns that could cause catastrophic backtracking
	if #pattern > 128 then
	return api.send_message(message.chat.id, 'Pattern too long (max 128 characters).')
	end
	local wq_count = 0
	do
	local i = 1
	while i <= #pattern do
	if pattern:sub(i, i) == '%' then
	i = i + 2
	elseif pattern:sub(i, i) == '.' and i < #pattern then
	local nc = pattern:sub(i + 1, i + 1)
	if nc == '+' or nc == '*' or nc == '-' then wq_count = wq_count + 1 end
	i = i + 1
	else
	i = i + 1
	end
	end
	end
	if wq_count > 3 then
	return api.send_message(message.chat.id, 'Pattern too complex (too many wildcard repetitions).')
	end

	-- check for duplicate
	local existing = ctx.db.call('sp_check_trigger_exists', { message.chat.id, pattern })
	if existing and #existing > 0 then
	ctx.db.call('sp_update_trigger_response', { response, message.chat.id, pattern })
	return api.send_message(message.chat.id, string.format(
	'Trigger <code>%s</code> has been updated.',
	tools.escape_html(pattern)
	), { parse_mode = 'html' })
	end

	ctx.db.call('sp_insert_trigger', { message.chat.id, pattern, response, message.from.id })

	-- invalidate trigger cache
	local session = require('src.core.session')
	session.invalidate_cached_list(message.chat.id, 'triggers')

	api.send_message(message.chat.id, string.format(
	'Trigger added: <code>%s</code> -> %s',
	tools.escape_html(pattern),
	tools.escape_html(response:sub(1, 100)) .. (#response > 100 and '...' or '')
	), { parse_mode = 'html' })
	end

	-- handle trigger matching on every new message
	function plugin.on_new_message(api, message, ctx)
	if not ctx.is_group or not message.text or message.text == '' then return end
	-- don't trigger on commands
	if message.text:match('^[/!#]') then return end

	-- cache triggers per chat (5-min ttl)
	local session = require('src.core.session')
	local triggers = session.get_cached_list(message.chat.id, 'triggers', function()
	return ctx.db.call('sp_get_triggers', { message.chat.id })
	end, 300)
	if not triggers or #triggers == 0 then return end

	local text = message.text:lower()
	for _, t in ipairs(triggers) do
	-- Skip patterns that could cause catastrophic backtracking
	if #t.pattern > 128 then goto continue end
	local ok, matched = pcall(function()
	return text:match(t.pattern:lower())
	end)
	if ok and matched then
	if t.is_media and t.file_id then
	-- send media response
	api.send_document(message.chat.id, t.file_id, { reply_parameters = { message_id = message.message_id } })
	else
	api.send_message(message.chat.id, t.response, { reply_parameters = { message_id = message.message_id } })
	end
	return
	end
	::continue::
	end
	end

	return plugin

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