-- bot.lua
-- Run this!

HTTP = require('socket.http')
HTTPS = require('ssl.https')
URL = require('socket.url')
JSON = require('dkjson')

VERSION = 2.7

function on_msg_receive(msg)

	if config.blacklist[tostring(msg.from.id)] then return end

	msg = process_msg(msg)

	if msg.date < os.time() - 5 then return end -- don't react to old messages
	if not msg.text then return end -- don't react to media messages
	if msg.forward_from then return end -- don't react to forwarded messages

	local lower = string.lower(msg.text)
	for i,v in pairs(plugins) do
		for j,w in pairs(v.triggers) do
			if string.match(lower, w) then
				if not v.no_typing then
					send_chat_action(msg.chat.id, 'typing')
				end
				local a,b = pcall(function() -- Janky error handling
					v.action(msg)
				end)
				if not a then
					print(b)
					send_msg(msg, b)
				end
			end
		end
	end
end

function bot_init()
	require('utilities')

	print('\nLoading configuration...')

	config = dofile('config.lua')

	print(#config.plugins .. ' plugins enabled.')

	require('bindings')

	print('\nFetching bot information...')

	bot = get_me().result
	if not bot then
		error('Failure fetching bot information.')
	end
	for k,v in pairs(bot) do
		print('',k,v)
	end

	print('Bot information retrieved!\n')
	print('Loading plugins...')

	plugins = {}
	for i,v in ipairs(config.plugins) do
		print('',v)
		local p = dofile('plugins/'..v)
		table.insert(plugins, p)
	end

	print('Done! Plugins loaded: ' .. #plugins .. '\n')
	print('Generating help message...')

	help_message = ''
	for i,v in ipairs(plugins) do
		if v.doc then
			local a = string.sub(v.doc, 1, string.find(v.doc, '\n')-1)
			print(a)
			help_message = help_message .. ' - ' .. a .. '\n'
		end
	end

	print('Help message generated!\n')

	print('username: @'..bot.username)
	print('name: '..bot.first_name)
	print('ID: '..bot.id)

	is_started = true

end

function process_msg(msg)

	if msg.new_chat_participant and msg.new_chat_participant.id ~= bot.id then
		msg.text = 'hi '..bot.first_name
		msg.from = msg.new_chat_participant
	end

	if msg.left_chat_participant and msg.left_chat_participant.id ~= bot.id then
		msg.text = 'bye '..bot.first_name
		msg.from = msg.left_chat_participant
	end

	if msg.new_chat_participant and msg.new_chat_participant.id == bot.id then
		msg.text = '/about'
	end

	return msg

end

bot_init()
reminders = {}
last_update = 0
while is_started do

	local res = get_updates(last_update+1)
	if not res then
		print('Error getting updates.')
	else
		for i,v in ipairs(res.result) do
			if v.update_id > last_update then
				last_update = v.update_id
				on_msg_receive(v.message)
			end
		end
	end

	for i,v in pairs(reminders) do
		if os.time() > v.alarm then
			local a = send_message(v.chat_id, 'Reminder: '..v.text)
			if a then
				table.remove(reminders, i)
			end
		end
	end
end
print('Halted.')