digiscreen = {}

function digiscreen.removeEntity(pos)
	local entitiesNearby = core.get_objects_inside_radius(pos,0.5)
	for _,i in pairs(entitiesNearby) do
		if i:get_luaentity() and i:get_luaentity().name == "digiscreen:image" then
			i:remove()
		end
	end
end

function digiscreen.processDigilinesMessage(pos,msg)
	local data = {}
	for y=1,16,1 do
		data[y] = {}
		if type(msg[y]) ~= "table" then msg[y] = {} end
		for x=1,16,1 do
			if type(msg[y][x]) == "string" and string.len(msg[y][x]) == 7 and string.sub(msg[y][x],1,1) == "#" then
				msg[y][x] = string.sub(msg[y][x],2,-1)
			end
			if type(msg[y][x]) ~= "string" or string.len(msg[y][x]) ~= 6 then msg[y][x] = "000000" end
			msg[y][x] = string.upper(msg[y][x])
			for i=1,6,1 do
				if not tonumber(string.sub(msg[y][x],i,i),16) then
					msg[y][x] = "000000"
				end
			end
			data[y][x] = msg[y][x]
		end
	end
	local bincolors = ""
	for y=1,16,1 do
		if type(data[y]) ~= "table" then data[y] = {} end
		for x=1,16,1 do
			local colorspec = 0
			if data[y][x] then
				colorspec = tonumber(data[y][x],16) or 0
			end
			colorspec = 0xFF000000 + colorspec
			bincolors = bincolors..core.colorspec_to_bytes(colorspec)
		end
	end
	local img = core.encode_png(16,16,bincolors,1)
	return pos,"[png:"..core.encode_base64(img),bincolors
end

function digiscreen.updateDisplay(pos)
	digiscreen.removeEntity(pos)
	local meta = core.get_meta(pos)
	local texture = meta:get_string("texture")
	if (not texture) or texture == "" then
		local oldData = meta:get_string("data")
		if oldData and string.len(oldData) > 1 then
			oldData = core.deserialize(oldData)
			if not oldData then return end
			core.handle_async(digiscreen.processDigilinesMessage,digiscreen.asyncDone,pos,oldData)
			return
		end
	end
	local entity = core.add_entity(pos,"digiscreen:image")
	local fdir = core.facedir_to_dir(core.get_node(pos).param2)
	entity:set_properties({textures={texture}})
	entity:set_yaw((fdir.x ~= 0) and math.pi/2 or 0)
	entity:set_pos(vector.add(pos,vector.multiply(fdir,0.39)))
end

function digiscreen.asyncDone(pos,texture,bincolors)
	local node = core.get_node(pos)
	if node.name ~= "digiscreen:digiscreen" then return end
	local meta = core.get_meta(pos)
	meta:set_string("data","")
	meta:set_string("bincolors",bincolors)
	meta:set_string("texture",texture)
	digiscreen.updateDisplay(pos)
	core.get_node_timer(pos):start(5)
end

function digiscreen.recompress(pos,bincolors)
	if string.len(bincolors) ~= 1024 then return false end
	local img = core.encode_png(16,16,bincolors,9)
	return true,pos,"[png:"..core.encode_base64(img)
end

function digiscreen.recompressDone(ok,pos,texture)
	if not ok then return end
	local node = core.get_node(pos)
	if node.name ~= "digiscreen:digiscreen" then return end
	local meta = core.get_meta(pos)
	meta:set_string("bincolors","")
	meta:set_string("texture",texture)
	digiscreen.updateDisplay(pos)
end

core.register_entity("digiscreen:image",{
	initial_properties = {
		visual = "upright_sprite",
		physical = false,
		collisionbox = {0,0,0,0,0,0,},
		textures = {"digiscreen_pixel.png",},
		glow = 14,
		shaded = true,
		static_save = false,
	},
})

core.register_node("digiscreen:digiscreen",{
	description = "Digilines Graphical Display",
	tiles = {"digiscreen_pixel.png",},
	groups = {cracky = 3,},
	paramtype = "light",
	paramtype2 = "facedir",
	on_rotate = core.global_exists("screwdriver") and screwdriver.rotate_simple,
	drawtype = "nodebox",
	node_box = {
		type = "fixed",
		fixed = {-0.5,-0.5,0.4,0.5,0.5,0.5},
	},
	_digistuff_channelcopier_fieldname = "channel",
	light_source = 10,
	on_construct = function(pos)
		local meta = core.get_meta(pos)
		meta:set_string("formspec","field[channel;Channel;${channel}]")
		local disp = {}
		for y=1,16,1 do
			disp[y] = {}
			for x=1,16,1 do
				disp[y][x] = "000000"
			end
		end
		meta:set_string("data",core.serialize(disp))
		digiscreen.updateDisplay(pos)
	end,
	on_destruct = digiscreen.removeEntity,
	on_receive_fields = function(pos,_,fields,sender)
		local name = sender:get_player_name()
		if not fields.channel then return end
		if core.is_protected(pos,name) and not core.check_player_privs(name,"protection_bypass") then
			core.record_protection_violation(pos,name)
			return
		end
		local meta = core.get_meta(pos)
		meta:set_string("channel",fields.channel)
	end,
	on_punch = function(screenpos,_,player)
		if player and not player.is_fake_player then
			local eyepos = vector.add(player:get_pos(),vector.add(player:get_eye_offset(),vector.new(0,1.5,0)))
			local lookdir = player:get_look_dir()
			local distance = vector.distance(eyepos,screenpos)
			local endpos = vector.add(eyepos,vector.multiply(lookdir,distance+1))
			local ray = core.raycast(eyepos,endpos,true,false)
			local pointed,screen,hitpos
			repeat
				pointed = ray:next()
				if pointed and pointed.type == "node" then
					local node = core.get_node(pointed.under)
					if node.name == "digiscreen:digiscreen" then
						screen = pointed.under
						hitpos = vector.subtract(pointed.intersection_point,screen)
					end
				end
			until screen or not pointed
			if not hitpos then return end
			local facedir = core.facedir_to_dir(core.get_node(screen).param2)
			if facedir.x > 0 then
				hitpos.x = -1*hitpos.z
			elseif facedir.x < 0 then
				hitpos.x = hitpos.z
			elseif facedir.z < 0 then
				hitpos.x = -1*hitpos.x
			end
			hitpos.y = -1*hitpos.y
			local hitpixel = {}
			hitpixel.x = math.floor((hitpos.x+0.5)*16+0.5)+1
			hitpixel.y = math.floor((hitpos.y+0.5)*16+0.5)+1
			if hitpixel.x < 1 or hitpixel.x > 16 or hitpixel.y < 1 or hitpixel.y > 16 then return end
			local message = {
				x = hitpixel.x,
				y = hitpixel.y,
				player = player:get_player_name(),
			}
			digilines.receptor_send(screenpos,digilines.rules.default,core.get_meta(screenpos):get_string("channel"),message)
		end
	end,
	on_timer = function(pos)
		local bincolors = core.get_meta(pos):get_string("bincolors")
		if string.len(bincolors) > 0 then core.handle_async(digiscreen.recompress,digiscreen.recompressDone,pos,bincolors) end
	end,
	digiline = {
		wire = {
			rules = digilines.rules.default,
		},
		effector = {
			action = function(pos,_,channel,msg)
				local meta = core.get_meta(pos)
				local setchan = meta:get_string("channel")
				if type(msg) ~= "table" or setchan ~= channel then return end
				core.handle_async(digiscreen.processDigilinesMessage,digiscreen.asyncDone,pos,msg)
			end,
		},
	},
})

core.register_lbm({
	name = "digiscreen:respawn",
	label = "Respawn/upgrade digiscreen entities",
	nodenames = {"digiscreen:digiscreen"},
	run_at_every_load = true,
	action = digiscreen.updateDisplay,
})

local luacontroller = "mesecons_luacontroller:luacontroller0000"
local rgblightstone = "rgblightstone:rgblightstone_truecolor_0"

core.register_craft({
	output = "digiscreen:digiscreen",
	recipe = {
		{luacontroller,rgblightstone,rgblightstone,},
		{rgblightstone,rgblightstone,rgblightstone,},
		{rgblightstone,rgblightstone,rgblightstone,},
	},
})