local S = minetest.get_translator(minetest.get_current_modname())
local F = minetest.formspec_escape
local C = minetest.colorize

-- Prepare player info table
local players = {}

-- Containing all the items for each Creative Mode tab
local inventory_lists = {}

--local mod_player = minetest.get_modpath("mcl_player")

-- Create tables
local builtin_filter_ids = {"blocks","deco","redstone","rail","food","tools","combat","mobs","brew","matr","misc","all"}
for _, f in pairs(builtin_filter_ids) do
	inventory_lists[f] = {}
end

local function replace_enchanted_books(tbl)
	for k, item in ipairs(tbl) do
		if item:find("mcl_enchanting:book_enchanted") == 1 then
			local _, enchantment, level = item:match("(%a+) ([_%w]+) (%d+)")
			level = level and tonumber(level)
			if enchantment and level then
				tbl[k] = mcl_enchanting.enchant(ItemStack("mcl_enchanting:book_enchanted"), enchantment, level)
			end
		end
	end
end

--[[ Populate all the item tables. We only do this once. Note this code must be
executed after loading all the other mods in order to work. ]]
minetest.register_on_mods_loaded(function()
	for name,def in pairs(minetest.registered_items) do
		if (not def.groups.not_in_creative_inventory or def.groups.not_in_creative_inventory == 0) and def.description and def.description ~= "" then
			local function is_redstone(def)
				return def.mesecons or def.groups.mesecon or def.groups.mesecon_conductor_craftable or def.groups.mesecon_effecor_off
			end
			local function is_tool(def)
				return def.groups.tool or (def.tool_capabilities and def.tool_capabilities.damage_groups == nil)
			end
			local function is_weapon_or_armor(def)
				return def.groups.weapon or def.groups.weapon_ranged or def.groups.ammo or def.groups.combat_item or ((def.groups.armor_head or def.groups.armor_torso or def.groups.armor_legs or def.groups.armor_feet or def.groups.horse_armor) and def.groups.non_combat_armor ~= 1)
			end
			-- Is set to true if it was added in any category besides misc
			local nonmisc = false
			if def.groups.building_block then
				table.insert(inventory_lists["blocks"], name)
				nonmisc = true
			end
			if def.groups.deco_block then
				table.insert(inventory_lists["deco"], name)
				nonmisc = true
			end
			if is_redstone(def) then
				table.insert(inventory_lists["redstone"], name)
				nonmisc = true
			end
			if def.groups.transport then
				table.insert(inventory_lists["rail"], name)
				nonmisc = true
			end
			if (def.groups.food and not def.groups.brewitem) or def.groups.eatable then
				table.insert(inventory_lists["food"], name)
				nonmisc = true
			end
			if is_tool(def) then
				table.insert(inventory_lists["tools"], name)
				nonmisc = true
			end
			if is_weapon_or_armor(def) then
				table.insert(inventory_lists["combat"], name)
				nonmisc = true
			end
			if def.groups.spawn_egg == 1 then
				table.insert(inventory_lists["mobs"], name)
				nonmisc = true
			end
			if def.groups.brewitem then
				table.insert(inventory_lists["brew"], name)
				nonmisc = true
			end
			if def.groups.craftitem then
				table.insert(inventory_lists["matr"], name)
				nonmisc = true
			end
			-- Misc. category is for everything which is not in any other category
			if not nonmisc then
				table.insert(inventory_lists["misc"], name)
			end

			table.insert(inventory_lists["all"], name)
		end
	end

	for ench, def in pairs(mcl_enchanting.enchantments) do
		local str = "mcl_enchanting:book_enchanted " .. ench .. " " .. def.max_level
		if def.inv_tool_tab then
			table.insert(inventory_lists["tools"], str)
		end
		if def.inv_combat_tab then
			table.insert(inventory_lists["combat"], str)
		end
		table.insert(inventory_lists["all"], str)
	end

	for _, to_sort in pairs(inventory_lists) do
		table.sort(to_sort)
		replace_enchanted_books(to_sort)
	end
end)

local function filter_item(name, description, lang, filter)
	local desc
	if not lang then
		desc = string.lower(description)
	else
		desc = string.lower(minetest.get_translated_string(lang, description))
	end
	return string.find(name, filter, nil, true) or string.find(desc, filter, nil, true)
end

local function set_inv_search(filter, player)
	local playername = player:get_player_name()
	local inv = minetest.get_inventory({type="detached", name="creative_"..playername})
	local creative_list = {}
	local lang = minetest.get_player_information(playername).lang_code
	for name,def in pairs(minetest.registered_items) do
		if (not def.groups.not_in_creative_inventory or def.groups.not_in_creative_inventory == 0) and def.description and def.description ~= "" then
			if filter_item(string.lower(def.name), def.description, lang, filter) then
				table.insert(creative_list, name)
			end
		end
	end
	for ench, def in pairs(mcl_enchanting.enchantments) do
		for i = 1, def.max_level do
			local stack = mcl_enchanting.enchant(ItemStack("mcl_enchanting:book_enchanted"), ench, i)
			if filter_item("mcl_enchanting:book_enchanted", minetest.strip_colors(stack:get_description()), lang, filter) then
				table.insert(creative_list, "mcl_enchanting:book_enchanted " .. ench .. " " .. i)
			end
		end
	end
	table.sort(creative_list)
	replace_enchanted_books(creative_list)

	inv:set_size("main", #creative_list)
	inv:set_list("main", creative_list)
end

local function set_inv_page(page, player)
	local playername = player:get_player_name()
	local inv = minetest.get_inventory({type="detached", name="creative_"..playername})
	inv:set_size("main", 0)
	local creative_list = {}
	if inventory_lists[page] then -- Standard filter
		creative_list = inventory_lists[page]
	end
	inv:set_size("main", #creative_list)
	players[playername].inv_size = #creative_list
	inv:set_list("main", creative_list)
end

local function init(player)
	local playername = player:get_player_name()
	minetest.create_detached_inventory("creative_"..playername, {
		allow_move = function(inv, from_list, from_index, to_list, to_index, count, player)
			if minetest.is_creative_enabled(playername) then
				return count
			else
				return 0
			end
		end,
		allow_put = function(inv, listname, index, stack, player)
			return 0
		end,
		allow_take = function(inv, listname, index, stack, player)
			if minetest.is_creative_enabled(player:get_player_name()) then
				return -1
			else
				return 0
			end
		end,
	}, playername)
	set_inv_page("all", player)
end

-- Create the trash field
local trash = minetest.create_detached_inventory("trash", {
	allow_put = function(inv, listname, index, stack, player)
		if minetest.is_creative_enabled(player:get_player_name()) then
			return stack:get_count()
		else
			return 0
		end
	end,
	on_put = function(inv, listname, index, stack, player)
		inv:set_stack(listname, index, "")
	end,
})
trash:set_size("main", 1)

local noffset = {} -- numeric tab offset
local offset = {} -- string offset:
local boffset = {} --
local hoch = {}
local filtername = {}
--local bg = {}

local noffset_x_start = -0.24
local noffset_x = noffset_x_start
local noffset_y = -0.25
local function next_noffset(id, right)
	if right then
		noffset[id] = { 8.94, noffset_y }
	else
		noffset[id] = { noffset_x, noffset_y }
		noffset_x = noffset_x + 1.25
	end
end

-- Upper row
next_noffset("blocks")
next_noffset("deco")
next_noffset("redstone")
next_noffset("rail")
next_noffset("brew")
next_noffset("misc")
next_noffset("nix", true)

noffset_x = noffset_x_start
noffset_y = 8.12

-- Lower row
next_noffset("food")
next_noffset("tools")
next_noffset("combat")
next_noffset("mobs")
next_noffset("matr")
next_noffset("inv", true)

for k,v in pairs(noffset) do
	offset[k] = tostring(v[1]) .. "," .. tostring(v[2])
	boffset[k] = tostring(v[1]+0.19) .. "," .. tostring(v[2]+0.25)
end

hoch["blocks"] = ""
hoch["deco"] = ""
hoch["redstone"] = ""
hoch["rail"] = ""
hoch["brew"] = ""
hoch["misc"] = ""
hoch["nix"] = ""
hoch["default"] = ""
hoch["food"] = "_down"
hoch["tools"] = "_down"
hoch["combat"] = "_down"
hoch["mobs"] = "_down"
hoch["matr"] = "_down"
hoch["inv"] = "_down"

filtername["blocks"] = S("Building Blocks")
filtername["deco"] = S("Decoration Blocks")
filtername["redstone"] = S("Redstone")
filtername["rail"] = S("Transportation")
filtername["misc"] = S("Miscellaneous")
filtername["nix"] = S("Search Items")
filtername["food"] = S("Foodstuffs")
filtername["tools"] = S("Tools")
filtername["combat"] = S("Combat")
filtername["mobs"] = S("Mobs")
filtername["brew"] = S("Brewing")
filtername["matr"] = S("Materials")
filtername["inv"] = S("Survival Inventory")

--local dark_bg = "crafting_creative_bg_dark.png"

--[[local function reset_menu_item_bg()
	bg["blocks"] = dark_bg
	bg["deco"] = dark_bg
	bg["redstone"] = dark_bg
	bg["rail"] = dark_bg
	bg["misc"] = dark_bg
	bg["nix"] = dark_bg
	bg["food"] = dark_bg
	bg["tools"] = dark_bg
	bg["combat"] = dark_bg
	bg["mobs"] = dark_bg
	bg["brew"] = dark_bg
	bg["matr"] = dark_bg
	bg["inv"] = dark_bg
	bg["default"] = dark_bg
end]]

local function get_stack_size(player)
	return player:get_meta():get_int("mcl_inventory:switch_stack")
end

local function set_stack_size(player, n)
	player:get_meta():set_int("mcl_inventory:switch_stack", n)
end

minetest.register_on_joinplayer(function (player)
	if get_stack_size(player) == 0 then
		set_stack_size(player, 64)
	end
end)

function mcl_inventory.set_creative_formspec(player)
	local playername = player:get_player_name()
	if not players[playername] then return end

	local start_i = players[playername].start_i
	local pagenum = start_i / (9*5) + 1
	local name = players[playername].page
	local inv_size = players[playername].inv_size
	local filter = players[playername].filter
	local pagemax = math.max(1, math.floor((inv_size-1) / (9*5) + 1))
	local main_list
	local listrings = "listring[detached:creative_"..playername..";main]"..
		"listring[current_player;main]"..
		"listring[detached:trash;main]"

	local inv_bg = "crafting_inventory_creative.png"
	if name == "inv" then
		inv_bg = "crafting_inventory_creative_survival.png"

		-- Background images for armor slots (hide if occupied)
		local armor_slot_imgs = ""
		local inv = player:get_inventory()
		if inv:get_stack("armor", 2):is_empty() then
			armor_slot_imgs = armor_slot_imgs .. "image[2.5,1.3;1,1;mcl_inventory_empty_armor_slot_helmet.png]"
		end
		if inv:get_stack("armor", 3):is_empty() then
			armor_slot_imgs = armor_slot_imgs .. "image[2.5,2.75;1,1;mcl_inventory_empty_armor_slot_chestplate.png]"
		end
		if inv:get_stack("armor", 4):is_empty() then
			armor_slot_imgs = armor_slot_imgs .. "image[5.5,1.3;1,1;mcl_inventory_empty_armor_slot_leggings.png]"
		end
		if inv:get_stack("armor", 5):is_empty() then
			armor_slot_imgs = armor_slot_imgs .. "image[5.5,2.75;1,1;mcl_inventory_empty_armor_slot_boots.png]"
		end

		if inv:get_stack("offhand", 1):is_empty() then
			armor_slot_imgs = armor_slot_imgs .. "image[1.5,2.025;1,1;mcl_inventory_empty_armor_slot_shield.png]"
		end

		local stack_size = get_stack_size(player)

		-- Survival inventory slots
		main_list = "list[current_player;main;0,3.75;9,3;9]" ..
			mcl_formspec.get_itemslot_bg(0, 3.75, 9, 3) ..
			
			-- Armor
			"list[current_player;armor;2.5,1.3;1,1;1]" ..
			"list[current_player;armor;2.5,2.75;1,1;2]" ..
			"list[current_player;armor;5.5,1.3;1,1;3]" ..
			"list[current_player;armor;5.5,2.75;1,1;4]" ..
			mcl_formspec.get_itemslot_bg(2.5, 1.3, 1, 1) ..
			mcl_formspec.get_itemslot_bg(2.5, 2.75, 1, 1) ..
			mcl_formspec.get_itemslot_bg(5.5, 1.3, 1, 1) ..
			mcl_formspec.get_itemslot_bg(5.5, 2.75, 1, 1) ..
			"list[current_player;offhand;1.5,2.025;1,1]" ..
			mcl_formspec.get_itemslot_bg(1.5, 2.025, 1, 1) ..
			armor_slot_imgs ..
			
			-- Player preview
			mcl_player.get_player_formspec_model(player, 3.9, 1.4, 1.2333, 2.4666, "") ..
			
			-- Crafting guide button
			"image_button[9,1;1,1;craftguide_book.png;__mcl_craftguide;]" ..
			"tooltip[__mcl_craftguide;"..F(S("Recipe book")) .. "]" ..
			
			-- Help button
			"image_button[9,2;1,1;doc_button_icon_lores.png;__mcl_doc;]" ..
			"tooltip[__mcl_doc;" .. F(S("Help")) .. "]" ..
			
			-- Achievements button
			"image_button[9,3;1,1;mcl_achievements_button.png;__mcl_achievements;]" ..
			--"style_type[image_button;border=;bgimg=;bgimg_pressed=]" ..
			"tooltip[__mcl_achievements;"..F(S("Advancements")) .. "]" ..
			
			-- Switch stack size button
			"image_button[9,4;1,1;default_apple.png;__switch_stack;]" ..
			"label[9.4,4.4;" .. F(C("#FFFFFF", stack_size ~= 1 and stack_size or "")) .. "]" ..
			"tooltip[__switch_stack;" .. F(S("Switch stack size")) .. "]"
			
		-- Skins button
		if minetest.global_exists("mcl_skins") then
			main_list = main_list ..
				"image_button[9,5;1,1;mcl_skins_button.png;__mcl_skins;]" ..
				"tooltip[__mcl_skins;"..F(S("Select player skin")) .. "]"
		end

		-- For shortcuts
		listrings = listrings ..
			"listring[detached:"..playername.."_armor;armor]"..
			"listring[current_player;main]"
	else
		-- Creative inventory slots
		main_list = "list[detached:creative_"..playername..";main;0,1.75;9,5;"..tostring(start_i).."]"..
			mcl_formspec.get_itemslot_bg(0,1.75,9,5)..
		-- Page buttons
			"label[9.0,5.5;"..F(S("@1/@2", pagenum, pagemax)).."]"..
			"image_button[9.0,6.0;0.7,0.7;crafting_creative_prev.png;creative_prev;]"..
			"image_button[9.5,6.0;0.7,0.7;crafting_creative_next.png;creative_next;]"
	end

	local tab_icon = {
		blocks = "mcl_core:brick_block",
		deco = "mcl_flowers:peony",
		redstone = "mesecons:redstone",
		rail = "mcl_minecarts:golden_rail",
		misc = "mcl_buckets:bucket_lava",
		nix = "mcl_compass:compass",
		food = "mcl_core:apple",
		tools = "mcl_core:axe_iron",
		combat = "mcl_core:sword_gold",
		mobs = "mobs_mc:cow",
		brew = "mcl_potions:dragon_breath",
		matr = "mcl_core:stick",
		inv = "mcl_chests:chest",
	}
	local function tab(current_tab, this_tab)
		local bg_img
		if current_tab == this_tab then
			bg_img = "crafting_creative_active"..hoch[this_tab]..".png"
		else
			bg_img = "crafting_creative_inactive"..hoch[this_tab]..".png"
		end
		return
			"style["..this_tab..";border=false;bgimg=;bgimg_pressed=]"..
			"item_image_button[" .. boffset[this_tab] ..";1,1;"..tab_icon[this_tab]..";"..this_tab..";]"..
			"image[" .. offset[this_tab] .. ";1.5,1.44;" .. bg_img .. "]"
	end
	local caption = ""
	if name ~= "inv" and filtername[name] then
		caption = "label[0,1.2;"..F(minetest.colorize("#313131", filtername[name])).."]"
	end

	local formspec = "size[10,9.3]"..
		"no_prepend[]"..
		mcl_vars.gui_nonbg..mcl_vars.gui_bg_color..
		"background[-0.19,-0.25;10.5,9.87;"..inv_bg.."]"..
		"label[-5,-5;"..name.."]"..
		tab(name, "blocks") ..
		"tooltip[blocks;"..F(filtername["blocks"]).."]"..
		tab(name, "deco") ..
		"tooltip[deco;"..F(filtername["deco"]).."]"..
		tab(name, "redstone") ..
		"tooltip[redstone;"..F(filtername["redstone"]).."]"..
		tab(name, "rail") ..
		"tooltip[rail;"..F(filtername["rail"]).."]"..
		tab(name, "misc") ..
		"tooltip[misc;"..F(filtername["misc"]).."]"..
		tab(name, "nix") ..
		"tooltip[nix;"..F(filtername["nix"]).."]"..
		caption..
		"list[current_player;main;0,7;9,1;]"..
		mcl_formspec.get_itemslot_bg(0,7,9,1)..
		main_list..
		tab(name, "food") ..
		"tooltip[food;"..F(filtername["food"]).."]"..
		tab(name, "tools") ..
		"tooltip[tools;"..F(filtername["tools"]).."]"..
		tab(name, "combat") ..
		"tooltip[combat;"..F(filtername["combat"]).."]"..
		tab(name, "mobs") ..
		"tooltip[mobs;"..F(filtername["mobs"]).."]"..
		tab(name, "brew") ..
		"tooltip[brew;"..F(filtername["brew"]).."]"..
		tab(name, "matr") ..
		"tooltip[matr;"..F(filtername["matr"]).."]"..
		tab(name, "inv") ..
		"tooltip[inv;"..F(filtername["inv"]).."]"..
		"list[detached:trash;main;9,7;1,1;]"..
		mcl_formspec.get_itemslot_bg(9,7,1,1)..
		"image[9,7;1,1;crafting_creative_trash.png]"..
		listrings

	if name == "nix" then
		formspec = formspec .. "field[5.3,1.34;4,0.75;search;;"..minetest.formspec_escape(filter).."]"
		formspec = formspec .. "field_close_on_enter[search;false]"
	end
	if pagenum then formspec = formspec .. "p"..tostring(pagenum) end
	player:set_inventory_formspec(formspec)
end

minetest.register_on_player_receive_fields(function(player, formname, fields)
	local page = nil

	if not minetest.is_creative_enabled(player:get_player_name()) then
		return
	end
	if formname ~= "" or fields.quit == "true" then
		-- No-op if formspec closed or not player inventory (formname == "")
		return
	end

	local name = player:get_player_name()

	if fields.blocks then
		if players[name].page == "blocks" then return end
		set_inv_page("blocks",player)
		page = "blocks"
	elseif fields.deco then
		if players[name].page == "deco" then return end
		set_inv_page("deco",player)
		page = "deco"
	elseif fields.redstone then
		if players[name].page == "redstone" then return end
		set_inv_page("redstone",player)
		page = "redstone"
	elseif fields.rail then
		if players[name].page == "rail" then return end
		set_inv_page("rail",player)
		page = "rail"
	elseif fields.misc then
		if players[name].page == "misc" then return end
		set_inv_page("misc",player)
		page = "misc"
	elseif fields.nix then
		set_inv_page("all",player)
		page = "nix"
	elseif fields.food then
		if players[name].page == "food" then return end
		set_inv_page("food",player)
		page = "food"
	elseif fields.tools then
		if players[name].page == "tools" then return end
		set_inv_page("tools",player)
		page = "tools"
	elseif fields.combat then
		if players[name].page == "combat" then return end
		set_inv_page("combat",player)
		page = "combat"
	elseif fields.mobs then
		if players[name].page == "mobs" then return end
		set_inv_page("mobs",player)
		page = "mobs"
	elseif fields.brew then
		if players[name].page == "brew" then return end
		set_inv_page("brew",player)
		page = "brew"
	elseif fields.matr then
		if players[name].page == "matr" then return end
		set_inv_page("matr",player)
		page = "matr"
	elseif fields.inv then
		if players[name].page == "inv" then return end
		page = "inv"
	elseif fields.search == "" and not fields.creative_next and not fields.creative_prev then
		set_inv_page("all", player)
		page = "nix"
	elseif fields.search and not fields.creative_next and not fields.creative_prev then
		set_inv_search(string.lower(fields.search),player)
		page = "nix"
	elseif fields.__switch_stack then
		local switch = 1
		if get_stack_size(player) == 1 then
			switch = 64
		end
		set_stack_size(player, switch)
	end

	if page then
		players[name].page = page
	else
		page = players[name].page
	end

	local start_i = players[name].start_i
	if fields.creative_prev then
		start_i = start_i - 9*5
	elseif fields.creative_next then
		start_i = start_i + 9*5
	else
		-- Reset scroll bar if not scrolled
		start_i = 0
	end
	if start_i < 0 then
		start_i = start_i + 9*5
	end

	local inv_size
	if page == "nix" then
		local inv = minetest.get_inventory({type="detached", name="creative_"..name})
		inv_size = inv:get_size("main")
	elseif page and page ~= "inv" then
		inv_size = #(inventory_lists[page])
	else
		inv_size = 0
	end
	players[name].inv_size = inv_size

	if start_i >= inv_size then
		start_i = start_i - 9*5
	end
	if start_i < 0 or start_i >= inv_size then
		start_i = 0
	end
	players[name].start_i = start_i

	if not fields.nix and fields.search then
		players[name].filter = fields.search
	else
		players[name].filter = ""
	end

	mcl_inventory.set_creative_formspec(player)
end)


minetest.register_on_placenode(function(pos, newnode, placer, oldnode, itemstack)
	return placer and placer:is_player() and minetest.is_creative_enabled(placer:get_player_name())
end)

minetest.register_on_joinplayer(function(player)
	-- Initialize variables and inventory
	local name = player:get_player_name()
	if not players[name] then
		players[name] = {}
		players[name].page = "nix"
		players[name].filter = ""
		players[name].start_i = 0
	end
	init(player)
	-- Setup initial creative inventory to the "nix" page.
	mcl_inventory.set_creative_formspec(player)
end)

minetest.register_on_player_inventory_action(function(player, action, inventory, inventory_info)
	if minetest.is_creative_enabled(player:get_player_name()) and get_stack_size(player) == 64 and action == "put" and inventory_info.listname == "main" then
		local stack = inventory_info.stack
		stack:set_count(stack:get_stack_max())
		player:get_inventory():set_stack("main", inventory_info.index, stack)
	end
end)