#!/usr/bin/env lua
--[[

Main program for HaxServ, a pseudoserver for inspircd3.

Written by: Test_User <hax@andrewyu.org>

This is free and unencumbered software released into the public
domain.

Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.

In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
]]

path = arg[0]:sub(1, -arg[0]:reverse():find('/'))

socket = require("socket")
json = require("json")
ssl = require("ssl")

servlist = {}
userlist = {}
chanlist = {}

function has_permission(user, privs)
	if not user or type(user) ~= "table" then
		return false
	end

	privs = privs or {}
	for _, v in pairs(privs) do
		if v == "Admin" then
			if user.opertype ~= "Admin" then
				return false
			end
		elseif v == "Owner" then				-- not dealing with this yet, so just always return false for now
			return false
		else							-- unknown priv, naturally no one has it
			return false
		end
	end
	return true
end

config_file = io.open(path.."CoupServConfig.json", "r+")
config = json.decode(config_file:read("*a"))

for file, _ in pairs(config.files) do
	dofile(path..file)
end

stdin = socket.tcp()
stdin:close()
stdin:setfd(0) --clearly a hack but it works

while true do
	servlist = {}
	userlist = {}
	chanlist = {}

	::continue::

	local s = socket.tcp4()
	s:connect("irc.andrewyu.org", 7005)
	local con = ssl.wrap(s, {mode = "client", protocol = "tlsv1_3"})

	if not con:dohandshake() then
		socket.select(nil, nil, 5)
		con:close()
		goto continue
	end

	local time = tostring(os.time())

	con:send("SERVER hax.irc.andrewyu.org "..config.send_password.." 0 1HC :HaxServ\n")
	con:send("BURST "..time.."\n")
	con:send("UID 1HC000000 "..time.." "..config.nick.." "..config.hostmask.." "..config.hostmask.." HaxServ 192.168.1.1 "..time.." +k :HaxServ\n")
	con:send(":1HC000000 OPERTYPE Admin\n")

	userlist["1HC000000"] = {
		server = "1HC",
		nick_ts = time,
		nick = config.nick,
		hostname = config.hostmask,
		vhost = config.hostmask,
		ident = "HaxServ",
		ip = "192.168.1.1",
		user_ts = time,
		modes = {
			["k"] = true,
		},
		realname = "HaxServ",

		metadata = {},
	}

	for channel, _ in pairs(config.channels) do
		con:send("FJOIN "..channel.." "..time.." + :,1HC000000\n")
		con:send("MODE "..channel.." +o 1HC000000\n")
	end
	con:send("ENDBURST\n")

	local proceed = true
	while proceed do
		ready, _, err = socket.select({con, stdin}, {}, 120)
		if err then
			con:send("")	-- hack to make it properly timeout due to annoying bugs
		end

		for _, sock in ipairs(ready) do
			if sock == con then
				local msg, err = con:receive()

				local original = msg

				if err then
					proceed = false
					break
				end

				local source = nil
				if msg:sub(1, 1) == ":" then
					source = msg:sub(2):match("^[^ ]*")
					msg = msg:sub(string.len(source) + 3) -- 1 for the leading ':', 1 for the trailing ' ', and 1 for the offset
				end

				local lastarg = msg:match(" :.*")
				if lastarg ~= nil then
					msg = msg:sub(1, -string.len(lastarg) - 1) -- only offset
					lastarg = lastarg:sub(3)
				end

				local args = {}
				for arg in msg:gmatch("[^ ]*") do
					table.insert(args, arg)
				end

				local command = args[1]
				table.remove(args, 1)

				if lastarg ~= nil then
					table.insert(args, lastarg)
				end

				if message_handler[command] then
					local success, stop = pcall(message_handler[command], con, source, args, original)
					if success and stop then
						proceed = false
						break
					elseif not success then
						print(stop)
					end
				else
					print("Unhandled command:", ("%q"):format(original))
				end
			elseif sock == stdin then
				msg = io.stdin:read()
				local args = {}
				for arg in msg:gmatch("[^ ]*") do
					table.insert(args, arg)
				end
				local command = args[1]:upper()
				table.remove(args, 1)

				if stdin_commands[command] then
					local success, err = pcall(stdin_commands[command], con, msg, args)
					if not success then
						print(err)
					elseif err then
						proceed = false
						break
					end
				else
					print("Unknown command.")
				end
			end
		end
		if err then break end
	end

	con:close()
end