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--[[
  Modular Chatbox Command Interpreter
	Made by LDDestroier
  This version uses native Coroutines API instead of StateMachine.
  
  pastebin get 5tJM4Bf8 mcci  
--]]
local progname = fs.getName(shell.getRunningProgram())
local baseDir = ".mcci" --all other directories are combined with this one, you see
local commandDir = fs.combine(baseDir,"cmd") --a folder
local commandHelpDir = fs.combine(baseDir,"cmdhelp") --a folder
local chatlogDir = fs.combine(baseDir,"chatlog") --a file
local banDir = fs.combine(baseDir,"banlist")
local adminDir = fs.combine(baseDir,"adminlist")
local configDir = fs.combine(baseDir,"config")
local chatEvents = {"chat_message","chatbox_command","chat"}
local _

local useMoarPeriphs = (peripheral.find("chatbox_admin") or peripheral.find("chatbox") or peripheral.find("chat_box")) and true or false --either moarperipherals/computronics xor peripherals++

if not fs.exists(commandDir) then fs.makeDir(commandDir) end
if not fs.exists(commandHelpDir) then fs.makeDir(commandHelpDir) end

local adminUserTable = { --only one who can use admin commands. default values.
	"EldidiStroyrr",
	"Notch",
}
if pairs ~= _G.pairs then
	pairs = function(tbl)
		if type(tbl) ~= "table" then
			error("expected a table here, but got "..type(tbl))
		else
			return _G.pairs(tbl)
		end
	end
end

local doRestart = false
local adminUser = function(u)
	if type(u) ~= "string" then return false end
	for a = 1, #adminUserTable do
		if adminUserTable[a]:lower() == u:lower() then
			return true
		end
	end
	return false
end
--[[
local getEvents = function(...)
	local arg = table.pack(...)
	local output
	while true do
		output = {os.pullEvent()}
		for a = 1, #arg do
			if output[1] == arg[a] then
				return table.unpack(output)
			end
		end
	end
end
--]]
--here's a more experimental getEvents...
getEvents = function(...)
	local arg, funky, output = table.pack(...), {}
	if #arg <= 1 then
		return os.pullEvent(table.unpack(arg))
	else
		for a = 1, #arg do
			funky[a] = function() output = {os.pullEvent(arg[a])} end
		end
		parallel.waitForAny(table.unpack(funky))
		return table.unpack(output)
	end
end

local mcci = {
	prefix = "(>",
	ignoreErrors = true,
	mcciLabel = "MCCI",
}

local chatbox
local usingAdminChatbox = false
local chatDelay = 0.1 --seconds. regular chatboxes in P+1 will error if you use them too fast
local chatbox = peripheral.find("chatbox_admin") or peripheral.find("chatbox") or peripheral.find("chatBox") or peripheral.find("chat_box")
local cLabel
local setLabel = function(newLabel)
	cLabel = newLabel
	if chatbox.setLabel then
		chatbox.setLabel(newLabel)
	elseif chatbox.setName then
		chatbox.setName(newLabel)
	end
end
if useMoarPeriphs then setLabel(mcci.mcciLabel) end
local SAY = commands.tellraw and function(user,message)
	commands.tellraw("@a",'{"text":"['..cLabel..'] '..message..'"}')
end or chatbox.say
local WHISPER = commands.tellraw and function(user,message)
	commands.tellraw(user,'{"text":"['..cLabel..'] '..message..'"}')
end or chatbox.tell
local parseListenEvent = function(evt)
	return evt[3 - (useMoarPeriphs and 0 or 1)], evt[4 - (useMoarPeriphs and 0 or 1)]
end
local LISTEN = function(username,checkPrefix)
	local evt, user, message
	while true do
		evt = {getEvents(table.unpack(chatEvents))}
		user, message = parseListenEvent(evt)
		if (user == (username or user)) then
			if checkPrefix then
				if message:sub(1,#tostring(checkPrefix)) == checkPrefix then
					message = message:sub(#tostring(checkPrefix)+1)
					break
				end
			else
				break
			end
		end
	end
	return user, message
end

local checkit = function(check, ...) --checks if the first argument is equal to one of the others
	local list = {...}
	for a = 1, #list do
		if list[a] == check then
			return true
		end
	end
	return false
end

local explode = function(div,str)
    if (div=='') then return false end
    local pos,arr = 0,{}
    for st,sp in function() return string.find(str,div,pos,false) end do
        table.insert(arr,string.sub(str,pos,st-1))
        pos = sp + 1
    end
    table.insert(arr,string.sub(str,pos))
    return arr
end

local chatlog = {}
local blacklist = {}
local whitelist = {}
local userActions = {}
local userActionNames = {}

local addToChatlog = function(user,message) --what the fuck do you think it does
	if chatlog[1] then
		if chatlog[#chatlog][1] == user and chatlog[#chatlog][2] == message then
			chatlog[#chatlog] = {user,message,chatlog[#chatlog][3]+1}
		else
			chatlog[#chatlog+1] = {user,message,1}
		end
	else
		chatlog[#chatlog+1] = {user,message,1}
	end
end

local writeChatlog = function() --appends chat output to the chat log
	prettyOutput = "("..chatlog[#chatlog][3] or "0"..") <"..chatlog[#chatlog][1].."> "..chatlog[#chatlog][2]
	local file = fs.open(chatlogDir,"a")
	file.writeLine(prettyOutput)
	file.close()
end

local saveBanlist = function()
	local file = fs.open(banDir,"w")
	for k,v in pairs(blacklist) do
		file.writeLine(k)
		file.writeLine(v)
		file.writeLine("")
	end
	file.close()
end

local loadBanlist = function()
	blacklist = {}
	local file = fs.open(banDir,"r")
	local name,reason = ""
	while name do
		name = file.readLine()
		if name then
			reason = file.readLine()
			file.readLine() --blank space
			blacklist[name] = reason
		end
	end
	file.close()
	return blacklist
end

local saveAdminlist = function()
	local file = fs.open(adminDir,"w")
	for a = 1, #adminUserTable do
		file.writeLine(adminUserTable[a])
	end
	file.close()
end

local loadAdminlist = function()
	adminUserTable = {}
	local file = fs.open(adminDir,"r")
	local line = ""
	while line do
		line = file.readLine()
		if line then
			adminUserTable[#adminUserTable+1] = line
		end
	end
	file.close()
	return adminUserTable
end

local saveConfig = function()
	local file = fs.open(configDir,"w")
	file.writeLine("prefix:"..textutils.serialize(mcci.prefix))
	file.writeLine("mcciLabel:"..textutils.serialize(mcci.mcciLabel))
	file.writeLine("ignoreErrors:"..tostring(mcci.ignoreErrors))
	file.close()
end

local fixInput = function(input)
	if tonumber(input) then
		return tonumber(input)
	elseif input == "false" then
		return false
	elseif input == "true" then
		return true
	elseif textutils.unserialize(input) then
		return textutils.unserialize(input)
	else
		return tostring(input)
	end
end

loadConfig = function()
	local file = fs.open(configDir,"r")
	local line = ""
	while line do
		line = file.readLine()
		if line then
			local name = line:sub(1,line:find(":")-1)
			local value = line:sub(line:find(":")+1)
			value = fixInput(value)
			mcci[name] = value
		end
	end
	file.close()
end

local scr_x, scr_y = term.getSize()

local render = function()
	term.setTextColor(colors.white)
	term.setBackgroundColor(colors.black)
	term.clear()
	term.setCursorPos(1,1)
	print("("..mcci.mcciLabel.."/Prefix='"..mcci.prefix.."')")
	print("(ignoreErrors="..tostring(mcci.ignoreErrors)..")")
	print(("-"):rep(scr_x))
	print("Active Users:")
	for k,v in pairs(userActions) do
		print("-"..k.." ("..userActionNames[k]..")")
	end
end

local initCommand = function(u,cmd,...)
	local yarg = table.pack(...)
	local golly_G = setmetatable({}, {__index=(_ENV or getfenv())})
	golly_G.chatbox = chatbox
	golly_G.WHISPER = WHISPER
	golly_G.SAY = SAY
	golly_G.LISTEN = LISTEN
	golly_G._USERNAME = u
	golly_G._PREFIX = mcci.prefix
	golly_G._ADMIN = adminUser(u)
	golly_G.pairs = pairs
	userActions[u] = coroutine.create(function()
		local func = loadfile(fs.combine(commandDir,cmd))
		func = setfenv(func, golly_G)
		local output = {pcall( function() return func(table.unpack(yarg)) end )}
		if mcci.ignoreErrors and (output[1] == false) then
			error(output[2])
		end
		return table.unpack(output)
	end)
	userActionNames[u] = cmd
	render()
end

local dCommands,dCommandsHelp
dCommandsHelp = {
	["belay"] = mcci.prefix.."belay [playername] ; Belays all commands or a specific player's.",
	["ban"] = mcci.prefix.."ban playername ; Bans a player from using this chat command interpreter.",
	["unban"] = mcci.prefix.."unban playername ; Unbans a player who was banned from using this command interpreter.",
	["banlist"] = mcci.prefix.."banlist ; Lists every player banned from using this command interpreter.",
	["help"] = mcci.prefix.."help [commandname] ; Gives a more detailed description of a command.",
	["update"] = mcci.prefix.."update ; Redownloads the MCCI program and overwrites the source if it's different.",
	["restart"] = mcci.prefix.."restart ; Restarts the program. One would usually do this after updating.",
	["checkadmin"] = mcci.prefix.."checkadmin [username] ; Without argument, checks if you are an admin. Also can check if another user is an admin.",
	["admin"] = mcci.prefix.."admin username ; Sets a username as an administrator.",
	["sudo"] = mcci.prefix.."sudo username command ; Runs a command as a specific user. Can't be used to abdicate.",
	["abdicate"] = mcci.prefix.."abdicate ; Use with no arguments to tick yourself off the list of admins. Use with care, there's no confirming.",
}
dCommands = { --default commands
	["belay"] = function(u,username)
		if adminUser(u) then
			if username then
				if userActions[username] then
					userActions[username] = nil
					WHISPER(u,username.."'s command has been belayed.")
					WHISPER(username,"Your command has been belayed. Ready.")
					render()
				else
					WHISPER(u,"That user isn't executing a cancelable command.")
				end
			else
				WHISPER(u,"All commands have been belayed.")
				for k,v in pairs(userActions) do
					WHISPER(k,"Your command has been belayed. Ready.")
				end
				userActions = {}
				render()
			end
		else
			WHISPER(k,"You can't do that!")
		end
	end,
	["ban"] = function(u,baduser,...)
		local arg = table.pack(...)
		if adminUser(u) then
			if adminUser(baduser) then
				WHISPER(u,"Very funny. You can't ban admins.")
			elseif not baduser then
				WHISPER(u,"Do "..mcci.prefix.."ban [username]")
			else
				if blacklist[baduser] then
					WHISPER(u,"That dude was already banned.")
				else
					blacklist[baduser] = table.concat(arg," ") or "Unspecified reason."
					userActions[baduser] = nil
					userActionNames[baduser] = nil
					render()
					WHISPER(u,"'"..baduser.."' has been banned from making commands.")
					WHISPER(baduser,"You are hereby BANNED from making MCCI commands!")
				end
			end
		else
			WHISPER(u,"You can't do that!")
		end
	end,
	["banlist"] = function(u)
		WHISPER(u,"## USERS BANNED FROM THIS CHAT AI ##")
		for k,v in pairs(blacklist) do
			WHISPER(u," * "..k.." ("..v..")")
		end
	end,
	["unban"] = function(u,baduser)
		if adminUser(u) then
			if adminUser(baduser) then
				WHISPER(u,"Admins can't be banned to begin with, you dolt.")
			elseif (not baduser) then
				WHISPER(u,"Do "..mcci.prefix.."unban [username]")
			else
				if (not blacklist[baduser]) then
					WHISPER(u,"That dude isn't banned.")
				else
					blacklist[baduser] = nil
					WHISPER(u,"'"..baduser.."' has been unbanned from making commands.")
					WHISPER(baduser,"You've been unbanned from making commands.")
				end
			end
		else
			if blacklist[gooduser] then
				WHISPER(u,"You can't do that!")
			else
				WHISPER(u,"You couldn't do that even if "..gooduser.." were banned!")
			end
		end
	end,
	["order"] = function(u)
		WHISPER(u,"What, do I look like a pizzeria to you?")
	end,
	["help"] = function(u,cmd)
		if cmd then
			if dCommands[cmd] then
				WHISPER(u,dCommandsHelp[cmd])
			else
				if not fs.exists(fs.combine(commandDir,cmd)) then
					WHISPER(u,"That command doesn't exist, internally or externally.")
				else
					if fs.exists(fs.combine(commandHelpDir,cmd)) then
						local file = fs.open(fs.combine(commandHelpDir,cmd),"r")
						local cont = file.readAll(file)
						file.close()
						cont = cont:gsub("$PREFIX",mcci.prefix):gsub("\n"," ; ")
						WHISPER(u,cont)
					else
						WHISPER(u,"That external command does not have a help file.")
					end
				end
			end
		else
			local list = {}
			local cmdlist = fs.list(commandDir)
			for k,v in pairs(dCommands) do
				list[#list+1] = k
			end
			for a = 1, #cmdlist do
				list[#list+1] = cmdlist[a]
			end
			for a = 1, #list do
				WHISPER(u,mcci.prefix..list[a])
			end
		end
	end,
	["update"] = function(u)
		if adminUser(u) then
			WHISPER(u,"Downloading latest version...")
			local foyle = http.get("https://pastebin.com/raw/5tJM4Bf8")
			if foyle then
				local cont = foyle.readAll()
				local mccifoyle = fs.open(shell.getRunningProgram(),"r")
				local mccicont = mccifoyle.readAll()
				mccifoyle.close()
				if mccicont == cont then
					WHISPER(u,"You were using the latest version. Aborting.")
				else
					local file = fs.open(shell.getRunningProgram(),"w")
					file.write(cont)
					file.close()
					WHISPER(u,"Update complete. Use "..mcci.prefix.."restart to run the latest version.")
				end
			end
		else
			WHISPER(u,"Yeah, try that again as an admin, doofus.")
		end
	end,
	["restart"] = function(u)
		if adminUser(u) then
			doRestart = true
		end
	end,
	["checkadmin"] = function(u,user)
		if not user then
			if adminUser(u) then
				WHISPER(u,"You're an admin.")
			else
				WHISPER(u,"You're decidedly not an admin.")
			end
		else
			if adminUser(user) then
				WHISPER(u,"'"..user.."' is an admin.")
			else
				WHISPER(u,"'"..user.."' is decidedly not an admin.")
			end
		end
	end,
	["admin"] = function(u,user)
		if not user then
			if adminUser(u) then
				WHISPER(u,"Expected an argument with who you wish to make an admin, dunce.")
			else
				WHISPER(u,"Only admins can make other people admins, you twat.")
			end
		else
			if adminUser(u) then
				if adminUser(user) then
					if user == u then
						WHISPER(u,"Oh my god, stop it.")
					else
						WHISPER(u,"That person is already an admin.")
					end
				else
					table.insert(adminUserTable,user)
					WHISPER(u,"'"..user.."' is now an admin.")
				end
			else
				WHISPER(u,"This is an admin command, lamebrain.")
			end
		end
	end,
	["abdicate"] = function(u,user)
		if adminUser(u) then
			if user then
				WHISPER(u,"You can't abdicate another user from their adminship.")
			else
				for a = 1, #adminUserTable do
					if adminUserTable[a] == u then
						table.remove(adminUserTable,a)
						WHISPER(u,"Lo, you have abdicated the throne of adminship.")
						return
					end
				end
				WHISPER(u,"That's weird. You weren't on the list, but you still did this command.")
			end
		else
			if user then
				WHISPER(u,"If you really don't like an admin, don't go complaining to me.")
			else
				WHISPER(u,"Abdicate from what? Only admins can do this!")
			end
		end
	end,
	["sudo"] = function(u,user,cmd,...)
		if adminUser(u) then
			if cmd == "abdicate" then
				WHISPER(u,"You can't use sudo to abdicate people!")
			else
				if user then
					if userActions[user] then
						WHISPER(u,"That user is already in a command.")
					else
						if cmd then
							initCommand(user,cmd,...)
							WHISPER(u,"Ran '"..cmd.."' as '"..user.."'.")
						else
							WHISPER(u,"Sudo requires a second argument for the command.")
						end
					end
				else
					WHISPER(u,"Sudo requires a first argument for the user.")
				end
			end
		else
			WHISPER(u,"Sudo is an admin's command!")
		end
	end,
}

local handleDcommands = function(u,f,...) --heh heh heh
	local arg = table.pack(...)
	if dCommands[f] then
		return true, dCommands[f](u,table.unpack(arg))
	else
		return false
	end
end

local handleNormalCommands = function(u,cmd,...)
	local yarg = table.pack(...)
	local cmdlist = fs.list(commandDir)
	for a = 1, #cmdlist do
		if cmdlist[a] == cmd then
			initCommand(u,cmd,table.unpack(yarg))
			if useMoarPeriphs then setLabel(mcci.mcciLabel..":"..userActionNames[u]) end
			return true
		end
	end
	return false
end

local fuckingDoIt = function(user,message)
--	local user, message
	local isDcommand, isNormalCommand
--	while true do
--		user, message = LISTEN()
--		sleep(0) --to ensure that chatbox output comes AFTER player chat
		addToChatlog(user,message)
		writeChatlog()
		loadBanlist()
		loadAdminlist()
		loadConfig()
		if useMoarPeriphs then setLabel(mcci.mcciLabel) end
		render()
		if not blacklist[user] then
			if message:sub(1,#mcci.prefix) == mcci.prefix then
				message = message:sub(#mcci.prefix+1)
				if userActions[user] then
					if message == "nvm" then
						userActions[user] = nil
						userActionNames[user] = nil
						WHISPER(user,"Command cancelled. Ready.")
						render()
					else
						return "followup_command_"..user, message
					end
				else
					isNormalCommand = handleNormalCommands(user,table.unpack(explode(" ",message)))
					if not isNormalCommand then
						isDcommand = handleDcommands(user,table.unpack(explode(" ",message)))
						if doRestart then
							return
						else
							if not isDcommand then
								WHISPER(user,"No such command exists, internally or externally.")
							end
						end
					end
				end
			end
			saveBanlist()
			saveAdminlist()
			saveConfig()
		end
--	end
end

if not fs.exists(adminDir) then
	saveAdminlist()
end
if not fs.exists(banDir) then
	saveBanlist()
end
if not fs.exists(configDir) then
	saveConfig()
end

loadAdminlist()
loadBanlist()
loadConfig()

render()

local doBreak, vres, grodyList --grodyList is the list of coroutines that will be purged after each queuing
local rootEvent = {}
local followUpEvent = {}
local doUserActions = function()
	while true do
		rootEvent = {os.pullEvent()}
		if checkit(rootEvent[1], table.unpack(chatEvents)) then
			followUpEvent = {fuckingDoIt(parseListenEvent(rootEvent))}
		end
		grodyList = {}
		for k,v in pairs(userActions) do
			if useMoarPeriphs then setLabel(mcci.mcciLabel..":"..userActionNames[k]) end
			if (coroutine.status(v) == "dead") then
				if useMoarPeriphs then setLabel(mcci.mcciLabel) end
				WHISPER(k,"Ready.")
				grodyList[#grodyList+1] = k
			else
				_,vres = coroutine.resume(v,table.unpack(rootEvent))
			end
		end
		for a = 1, #grodyList do
			userActions[grodyList[a]] = nil
			userActionNames[grodyList[a]] = nil
		end
		grodyList = {}
		if #followUpEvent > 0 then
			for k,v in pairs(userActions) do
				if useMoarPeriphs then setLabel(mcci.mcciLabel..":"..userActionNames[k]) end
				_,vres = coroutine.resume(v,table.unpack(rootEvent))
				if (coroutine.status(v) == "dead") then
					if useMoarPeriphs then setLabel(mcci.mcciLabel) end
					WHISPER(k,"Ready.")
					grodyList[#grodyList+1] = k
				end
			end
		end
		for a = 1, #grodyList do
			userActions[grodyList[a]] = nil
			userActionNames[grodyList[a]] = nil
		end
		render()
		if doRestart then return true end
	end
end

doUserActions()

if doRestart then
	SAY("MCCI Restarting.")
	shell.run(shell.getRunningProgram())
end