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local cqueues = require'cqueues'
local class = require'r.class'
local pprint = require'pprint'

local config = require'config'
local Channel = require'channel'
local Log = require 'log'
local Store = require 'store'

local pylon_classes = {
	irc = require'irc.pylon',
	xmpp = require'xmpp.pylon',
	discord = require'discord.pylon',
	nanochat = require'nanochat.pylon',
	quaddle = require'quaddle.pylon',
}

local Wilson = class()
function Wilson.make(cls, conf)
	local tlc = conf.top.level or {}
	local self = setmetatable({
		pylons={},
		busses={},
		cq = cqueues.new(),
		log = Log('(toplevel)',tlc.loglevel or 'info'),
		store = Store(),
	}, Wilson)
	for name, pylon_conf in pairs(conf.pylon) do
		pylon_conf.name = name
		local pylon_class = pylon_classes[pylon_conf.type]
		assert(pylon_class, "no such pylon type "..pylon_conf.type)
		self.pylons[name] = pylon_class:make(self, pylon_conf)
		self.log("constructed pylon",name,pylon_conf.type)
	end
	for name, bus_conf in pairs(conf.bus) do
		local bus = {}
		for _, item in ipairs(bus_conf) do
			local pylon_name, channel_descriptor = item[1], item[2]
			local pylon = self.pylons[pylon_name]
			assert(pylon,"no such pylon named "..pylon_name)
			table.insert(bus, Channel(pylon, channel_descriptor))
		end
		self.log("constructed bus  ",name,'with '..#bus_conf..' channels')
		self.busses[name] = bus
	end
	return self
end

-- find bus containing given channel
function Wilson._find_bus(self, channel)
	for name, bus in pairs(self.busses) do
		for _, q in ipairs(bus) do if q == channel then return bus end end
	end
	self.log:warn("unfound bus for",channel)
end
function Wilson.deliver(self, message)
	local bus = self:_find_bus(assert(message.source_channel))
	if bus then
		self.store:store(message)
		for _, dest_channel in ipairs(bus) do
			if message.source_channel ~= dest_channel then
				self.log:debug(message.source_channel, "-->", dest_channel, message)
				dest_channel.pylon:post(dest_channel, message)
			end
		end
	end
end
function Wilson.run(self)
	for pylonname, pylon in pairs(self.pylons) do
		self.cq:wrap(pylon.run, pylon)
		self.log("now running pylon", pylonname)
	end
	self.cq:wrap(self.store.run, self.store)
	self.log:loop(self.cq)
end

local config_file = assert(io.open("wilson.ini","r"))
local conf = config.parse(config_file)
config_file:close()
local wilson = Wilson:make(conf)
wilson:run()