-- lib/lunajson/src/ is not in default Lua package paths
package.path = 'lib/lunajson/src/?.lua;' .. package.path;

---
-- Put in blockstates to ignore:
local ignore = {
	["minecraft:redstone_wire"] = {
		east = "none", -- fix property to value
		north = "none",
		south = "none",
		west = "none",
	},
	["minecraft:redstone_ore"] = {
		lit = false  -- removes whole property
	},

	-- remove complete block (new in 1.13)
	["minecraft:conduit"] = false,
	["minecraft:sea_pickle"] = false,
	["minecraft:turtle_egg"] = false,

	["minecraft:kelp"] = false,
	["minecraft:kelp_plant"] = false,
	["minecraft:dried_kelp_block"] = false,

	["minecraft:seagrass"] = false,
	["minecraft:tall_seagrass"] = false,

	["minecraft:brain_coral"] = false,
	["minecraft:brain_coral_block"] = false,
	["minecraft:brain_coral_fan"] = false,
	["minecraft:brain_coral_wall_fan"] = false,
	["minecraft:bubble_coral"] = false,
	["minecraft:bubble_coral_block"] = false,
	["minecraft:bubble_coral_fan"] = false,
	["minecraft:bubble_coral_wall_fan"] = false,
	["minecraft:fire_coral"] = false,
	["minecraft:fire_coral_block"] = false,
	["minecraft:fire_coral_fan"] = false,
	["minecraft:fire_coral_wall_fan"] = false,
	["minecraft:horn_coral"] = false,
	["minecraft:horn_coral_block"] = false,
	["minecraft:horn_coral_fan"] = false,
	["minecraft:horn_coral_wall_fan"] = false,
	["minecraft:tube_coral"] = false,
	["minecraft:tube_coral_block"] = false,
	["minecraft:tube_coral_fan"] = false,
	["minecraft:tube_coral_wall_fan"] = false,
	["minecraft:dead_brain_coral_block"] = false,
	["minecraft:dead_brain_coral_fan"] = false,
	["minecraft:dead_brain_coral_wall_fan"] = false,
	["minecraft:dead_bubble_coral_block"] = false,
	["minecraft:dead_bubble_coral_fan"] = false,
	["minecraft:dead_bubble_coral_wall_fan"] = false,
	["minecraft:dead_fire_coral_block"] = false,
	["minecraft:dead_fire_coral_fan"] = false,
	["minecraft:dead_fire_coral_wall_fan"] = false,
	["minecraft:dead_horn_coral_block"] = false,
	["minecraft:dead_horn_coral_fan"] = false,
	["minecraft:dead_horn_coral_wall_fan"] = false,
	["minecraft:dead_tube_coral_block"] = false,
	["minecraft:dead_tube_coral_fan"] = false,
	["minecraft:dead_tube_coral_wall_fan"] = false,

	["minecraft:dark_prismarine_stairs"] = false,
	["minecraft:prismarine_brick_stairs"] = false,
	["minecraft:prismarine_stairs"] = false,

	["minecraft:prismarine_slab"] = false,
	["minecraft:prismarine_brick_slab"] = false,
	["minecraft:dark_prismarine_slab"] = false,

	["minecraft:spruce_trapdoor"] = false,
	["minecraft:birch_trapdoor"] = false,
	["minecraft:jungle_trapdoor"] = false,
	["minecraft:acacia_trapdoor"] = false,
	["minecraft:dark_oak_trapdoor"] = false,

	["minecraft:spruce_button"] = false,
	["minecraft:birch_button"] = false,
	["minecraft:jungle_button"] = false,
	["minecraft:acacia_button"] = false,
	["minecraft:dark_oak_button"] = false,

	["minecraft:stripped_oak_log"] = false,
	["minecraft:stripped_spruce_log"] = false,
	["minecraft:stripped_birch_log"] = false,
	["minecraft:stripped_jungle_log"] = false,
	["minecraft:stripped_acacia_log"] = false,
	["minecraft:stripped_dark_oak_log"] = false,

	["minecraft:stripped_oak_wood"] = false,
	["minecraft:stripped_spruce_wood"] = false,
	["minecraft:stripped_birch_wood"] = false,
	["minecraft:stripped_jungle_wood"] = false,
	["minecraft:stripped_acacia_wood"] = false,
	["minecraft:stripped_dark_oak_wood"] = false,
}


--- Prints usage instructions to stdout.
-- If the optional `message` is passed, output is prepended by message _and_
-- redirected to stderr.
function usage(message)
	if message then
		io.output(io.stderr);
		io.write(message, "\n\n");
	end
	io.write(
		"Usage: lua Generator.lua INPUTFILE OUTPUTFILE\n"..
		"Converts the Minecraft blocks.json report format to an upgrade "..
		"template from 1.12 to 1.13.\n"..
		"\n"..
		"INPUTFILE and OUTPUTFILE must point to a valid path. INPUTFILE must "..
		"be readable and OUTPUTFILE must be writable. Either can be replaced "..
		"with `-` (dash character) to point to standard-input or -output.\n");
	os.exit(message and 1 or 0);
end


-- Test whether the script is run in a path where it can load it's libraries
if not pcall(function() require("lunajson.decoder") end) then
	usage("Could not load required libraries, please run `Generator.lua` "..
		"within its directory and make sure to run `git submodule update`.");
end


-- Check/Prepare CLI arguments
local inpath, outpath = ...;
io.input(io.stdin);
io.output(io.stdout);

if select("#", ...) ~= 2 then
	usage("Incorrect number of arguments.");
end

if inpath ~= "-" then
	local handle, err = io.open(inpath, "r");
	io.input(handle or usage(err));
end

if outpath ~= "-" then
	local handle, err = io.open(outpath, "w");
	io.output(handle or usage(err));
end


-- Main program starts here
local decode = (require("lunajson.decoder"))();
local encode = (require("lunajson.encoder"))();

local input = decode(io.input():read("*a"));
local max_id = -1;
local EMPTY = {};
local blocknames = {};

for blockname, _ in pairs(input) do
	blocknames[#blocknames+1] = blockname;
end
table.sort(blocknames, function(k1, k2)
	return input[k1].states[1].id < input[k2].states[1].id;
end);

for _, blockname in ipairs(blocknames) do
	local blockdata = input[blockname];
	local propnames = {}; -- property name sorting
	local lines = {}; -- used for dedup

	if ignore[blockname] ~= false then
		io.stderr:write(("%d - %s\n"):format(#blockdata.states, blockname))

		for propname, _ in pairs(blockdata.properties or EMPTY) do
			propnames[#propnames+1] = propname;
		end
		table.sort(propnames);

		for i = 1, #(blockdata.states or {}) do
			local state = blockdata.states[i];
			local line = ""

			line = line .. "FIXME" .. "\t" .. "FIXME" .. "\t" .. blockname;

			for i = 1, #propnames do
				local property = propnames[i];
				if ignore[blockname] and ignore[blockname][property] ~= nil then
					if ignore[blockname][property] then
						line = line .. "\t" .. property .. "\t" .. ignore[blockname][property];
					end
				else
					line = line .. "\t" .. property .. "\t" .. state.properties[property];
				end
			end
			if not lines[line] then
				lines[line] = true;
				-- io.write(state.id, "\t"); -- test
				io.write(line, "\n");
			end
		end
	end
end