calc.lua
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calc.lua
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	--[[
	mattata v2.0 - Calculator Plugin
	Evaluates mathematical expressions using the mathjs.org API.
	]]

	local plugin = {}
	plugin.name = 'calc'
	plugin.category = 'utility'
	plugin.description = 'Evaluate mathematical expressions'
	plugin.commands = { 'calc', 'calculate', 'calculator' }
	plugin.help = '/calc <expression> - Evaluate a mathematical expression.'

	function plugin.on_message(api, message, ctx)
	local http = require('src.core.http')
	local url = require('socket.url')
	local tools = require('telegram-bot-lua.tools')

	local input = message.args
	if not input or input == '' then
	return api.send_message(message.chat.id, 'Please provide an expression to evaluate. Example: /calc 2+2*5')
	end

	local encoded = url.escape(input)
	local api_url = 'https://api.mathjs.org/v4/?expr=' .. encoded
	local body, status = http.get(api_url)
	if not body or status ~= 200 then
	return api.send_message(message.chat.id, 'Failed to evaluate that expression. Please check the syntax and try again.')
	end

	-- mathjs returns the result as plain text
	local result = body:match('^%s(.-)%s$')
	if not result or result == '' then
	return api.send_message(message.chat.id, 'No result returned for that expression.')
	end

	return api.send_message(
	message.chat.id,
	string.format('<b>Expression:</b> <code>%s</code>\n<b>Result:</b> <code>%s</code>', tools.escape_html(input), tools.escape_html(result)),
	{ parse_mode = 'html' }
	)
	end

	return plugin