--[[

	Hyperloop Mod
	=============

	Copyright (C) 2017 Joachim Stolberg

	LGPLv2.1+
	See LICENSE.txt for more information

	History:
	see init.lua

]]--

-- Return a text block with all station names and their attributes
local function station_list_as_string(pos)
	-- First sort the station list according to the players distance.
	local sortedList = {}
	local distance = 0
	for key_str, dataSet in pairs(table.copy(hyperloop.data.tAllStations)) do
		distance = hyperloop.distance(pos, dataSet["pos"])
		dataSet.distance = distance
		dataSet.key_str = key_str
		sortedList[#sortedList+1] = dataSet
	end
	table.sort(sortedList, function(x,y) 
			return x.distance < y.distance
		end)
	
	-- Then generate a list with lStationPositions[pos] = idx
	-- used to generate the "connected with" list.
	local lStationPositions = {}
	for idx,dataSet in ipairs(sortedList) do
		local spos = minetest.pos_to_string(dataSet.pos)
		lStationPositions[spos] = idx
	end
	
	local tRes = {"label[0,0;ID]label[0.7,0;Dist.]label[1.8,0;Station/Junction]label[4.2,0;Position]"..
		          "label[5.9,0;State]label[7.9,0;Owner]label[10,0;Conn. with]"}
	local state, owner
	for idx,dataSet in ipairs(sortedList) do
		if idx == 18 then
			break
		end
		local ypos = 0.2 + idx * 0.4
		if dataSet.station_name ~= nil then
			state = "Station"
		elseif dataSet.junction == true then
			dataSet.station_name = "Junction"
			state = "Junction"
		else
			dataSet.station_name = "<no name>"
			state = "unfinished"
		end
		if dataSet.owner ~= nil then
			owner = dataSet.owner
		else
			owner = "unknown"
		end
		tRes[#tRes+1] = "label[0,"..ypos..";"..idx.."]"
		tRes[#tRes+1] = "label[0.7,"..ypos..";"..dataSet.distance.." m]"
		tRes[#tRes+1] = "label[1.8,"..ypos..";"..dataSet.station_name.."]"
		tRes[#tRes+1] = "label[4.2,"..ypos..";"..minetest.pos_to_string(dataSet.pos).."]"
		tRes[#tRes+1] = "label[5.9,"..ypos..";"..state.."]"
		tRes[#tRes+1] = "label[7.9,"..ypos..";"..owner.."]"
		tRes[#tRes+1] = "label[10,"..ypos..";"
		--print(idx, #dataSet.routes)
		for _,route in ipairs(dataSet.routes) do
			local spos = '('..string.sub(route[2], 2, -2)..')'
			if lStationPositions[spos] then
				tRes[#tRes + 1] = lStationPositions[spos]
				tRes[#tRes + 1] = ", "
			else
				tRes[#tRes + 1] = spos
				tRes[#tRes + 1] = ", "
			end
		end
		tRes[#tRes] = "]"
	end
	return table.concat(tRes)
end


local function map_on_use(itemstack, user)
	local player_name = user:get_player_name()
	local pos = user:get_pos()
	local sStationList = station_list_as_string(pos)
	local formspec = "size[12,10]" .. default.gui_bg ..
	default.gui_bg_img ..
	sStationList ..
	"button_exit[5,9.5;2,1;close;Close]"

	minetest.show_formspec(player_name, "hyperloop:station_map", formspec)
	return itemstack
end

-- Tool for tube workers to find the next station
minetest.register_node("hyperloop:station_map", {
	description = "Hyperloop Station Book",
	inventory_image = "hyperloop_stations_book.png",
	wield_image = "hyperloop_stations_book.png",
	groups = {cracky=1, book=1},
	on_use = map_on_use,
	on_place = map_on_use,
	stack_max = 1,
})