local modpath = minetest.get_modpath("mcl_enchanting")
local S = minetest.get_translator("mcl_enchanting")

mcl_enchanting = {
	book_offset = vector.new(0, 0.75, 0),
	book_animations = {["close"] = 1, ["opening"] = 2, ["open"] = 3, ["closing"] = 4},
	book_animation_steps = {0, 640, 680, 700, 740},
	book_animation_speed = 40,
	roman_numerals = dofile(modpath .. "/roman_numerals.lua"), 			-- https://exercism.io/tracks/lua/exercises/roman-numerals/solutions/73c2fb7521e347209312d115f872fa49
	enchantments = {},
	overlay = "^[colorize:white:50^[colorize:purple:50",
	bookshelf_positions = {
		{x = -2, y = 0, z = -2}, {x = -2, y = 1, z = -2},
		{x = -1, y = 0, z = -2}, {x = -1, y = 1, z = -2},
		{x =  0, y = 0, z = -2}, {x =  0, y = 1, z = -2},
		{x =  1, y = 0, z = -2}, {x =  1, y = 1, z = -2},
		{x =  2, y = 0, z = -2}, {x =  2, y = 1, z = -2},
		{x = -2, y = 0, z =  2}, {x = -2, y = 1, z =  2},
		{x = -1, y = 0, z =  2}, {x = -1, y = 1, z =  2},
		{x =  0, y = 0, z =  2}, {x =  0, y = 1, z =  2},
		{x =  1, y = 0, z =  2}, {x =  1, y = 1, z =  2},
		{x =  2, y = 0, z =  2}, {x =  2, y = 1, z =  2},
		-- {x = -2, y = 0, z = -2}, {x = -2, y = 1, z = -2},
		{x = -2, y = 0, z = -1}, {x = -2, y = 1, z = -1},
		{x = -2, y = 0, z =  0}, {x = -2, y = 1, z =  0},
		{x = -2, y = 0, z =  1}, {x = -2, y = 1, z =  1},
		{x = -2, y = 0, z =  2}, {x = -2, y = 1, z =  2},
		{x =  2, y = 0, z = -2}, {x =  2, y = 1, z = -2},
		{x =  2, y = 0, z = -1}, {x =  2, y = 1, z = -1},
		{x =  2, y = 0, z =  0}, {x =  2, y = 1, z =  0},
		{x =  2, y = 0, z =  1}, {x =  2, y = 1, z =  1},
		-- {x =  2, y = 0, z =  2}, {x =  2, y = 1, z =  2},
	},
	air_positions = {
		{x = -1, y = 0, z = -1}, {x = -1, y = 1, z = -1},
		{x = -1, y = 0, z = -1}, {x = -1, y = 1, z = -1},
		{x =  0, y = 0, z = -1}, {x =  0, y = 1, z = -1},
		{x =  1, y = 0, z = -1}, {x =  1, y = 1, z = -1},
		{x =  1, y = 0, z = -1}, {x =  1, y = 1, z = -1},
		{x = -1, y = 0, z =  1}, {x = -1, y = 1, z =  1},
		{x = -1, y = 0, z =  1}, {x = -1, y = 1, z =  1},
		{x =  0, y = 0, z =  1}, {x =  0, y = 1, z =  1},
		{x =  1, y = 0, z =  1}, {x =  1, y = 1, z =  1},
		{x =  1, y = 0, z =  1}, {x =  1, y = 1, z =  1},
		-- {x = -1, y = 0, z = -1}, {x = -1, y = 1, z = -1},
		{x = -1, y = 0, z = -1}, {x = -1, y = 1, z = -1},
		{x = -1, y = 0, z =  0}, {x = -1, y = 1, z =  0},
		{x = -1, y = 0, z =  1}, {x = -1, y = 1, z =  1},
		{x = -1, y = 0, z =  1}, {x = -1, y = 1, z =  1},
		{x =  1, y = 0, z = -1}, {x =  1, y = 1, z = -1},
		{x =  1, y = 0, z = -1}, {x =  1, y = 1, z = -1},
		{x =  1, y = 0, z =  0}, {x =  1, y = 1, z =  0},
		{x =  1, y = 0, z =  1}, {x =  1, y = 1, z =  1},
		-- {x =  1, y = 0, z =  1}, {x =  1, y = 1, z =  1},
	},
}

dofile(modpath .. "/engine.lua")
dofile(modpath .. "/enchantments.lua")

minetest.register_chatcommand("enchant", {
	description = S("Enchant an item"),
	params = S("<player> <enchantment> [<level>]"),
	privs = {give = true},
	func = function(_, param)
		local sparam = param:split(" ")
		local target_name = sparam[1]
		local enchantment = sparam[2]
		local level_str = sparam[3]
		local level = tonumber(level_str or "1")
		if not target_name or not enchantment then
			return false, S("Usage: /enchant <player> <enchantment> [<level>]")
		end
		local target = minetest.get_player_by_name(target_name)
		if not target then
			return false, S("Player '@1' cannot be found.", target_name)
		end
		local itemstack = target:get_wielded_item()
		local can_enchant, errorstring, extra_info = mcl_enchanting.can_enchant(itemstack, enchantment, level)
		if not can_enchant then
			if errorstring == "enchantment invalid" then
				return false, S("There is no such enchantment '@1'.", enchantment)
			elseif errorstring == "item missing" then
				return false, S("The target doesn't hold an item.")
			elseif errorstring == "item not supported" then
				return false, S("The selected enchantment can't be added to the target item.")
			elseif errorstring == "level invalid" then
				return false, S("'@1' is not a valid number", level_str)
			elseif errorstring == "level too high" then
				return false, S("The number you have entered (@1) is too big, it must be at most @2.", level_str, extra_info)
			elseif errorstring == "level too small" then
				return false, S("The number you have entered (@1) is too small, it must be at least @2.", level_str, extra_info)
			elseif errorstring == "incompatible" then
				return false, S("@1 can't be combined with @2.", mcl_enchanting.get_enchantment_description(enchantment, level), extra_info)
			end
		else
			target:set_wielded_item(mcl_enchanting.enchant(itemstack, enchantment, level))
			return true, S("Enchanting succeded.")
		end
	end
})

minetest.register_chatcommand("forceenchant", {
	description = S("Forcefully enchant an item"),
	params = S("<player> <enchantment> [<level>]"),
	privs = {give = true},
	func = function(_, param)
		local sparam = param:split(" ")
		local target_name = sparam[1]
		local enchantment = sparam[2]
		local level_str = sparam[3]
		local level = tonumber(level_str or "1")
		if not target_name or not enchantment then
			return false, S("Usage: /forceenchant <player> <enchantment> [<level>]")
		end
		local target = minetest.get_player_by_name(target_name)
		if not target then
			return false, S("Player '@1' cannot be found.", target_name)
		end
		local itemstack = target:get_wielded_item()
		local can_enchant, errorstring, extra_info = mcl_enchanting.can_enchant(itemstack, enchantment, level)
		if errorstring == "enchantment invalid" then
			return false, S("There is no such enchantment '@1'.", enchantment)
		elseif errorstring == "item missing" then
			return false, S("The target doesn't hold an item.")
		elseif errorstring == "item not supported" and not mcl_enchanting.is_enchantable(itemstack:get_name()) then
			return false, S("The target item is not enchantable.")
		elseif errorstring == "level invalid" then
			return false, S("'@1' is not a valid number.", level_str)
		else
			target:set_wielded_item(mcl_enchanting.enchant(itemstack, enchantment, level))
			return true, S("Enchanting succeded.")
		end
	end
})

minetest.register_craftitem("mcl_enchanting:book_enchanted", {
	description = S("Enchanted Book"),
	inventory_image = "mcl_enchanting_book_enchanted.png" .. mcl_enchanting.overlay,
	groups = {enchanted = 1, not_in_creative_inventory = 1, enchantability = 1},
	_mcl_enchanting_enchanted_tool = "mcl_enchanting:book_enchanted",
	stack_max = 1,
})

minetest.register_entity("mcl_enchanting:book", {
	initial_properties = {
		visual = "mesh",
		mesh = "mcl_enchanting_book.b3d",
		visual_size = {x = 12.5, y = 12.5},
		collisionbox = {0, 0, 0},
		physical = false,
		textures = {"mcl_enchanting_book_entity.png"},
	},
	_player_near = false,
	_table_pos = nil,
	get_staticdata = function(self)
		local pstr = ""
		if self._table_pos then
			pstr = minetest.serialize(self._table_pos)
		end
		return pstr
	end,
	on_activate = function(self, staticdata)
		if staticdata ~= "" then
			local data = minetest.deserialize(staticdata)
			self._table_pos = data
		end
		self.object:set_armor_groups({immortal = 1})
		mcl_enchanting.set_book_animation(self, "close")
		mcl_enchanting.check_book(vector.subtract(self.object:get_pos(), mcl_enchanting.book_offset))
	end,
	on_step = function(self, dtime)
		local old_player_near = self._player_near
		local player_near = false
		local player
		for _, obj in ipairs(minetest.get_objects_inside_radius(vector.subtract(self.object:get_pos(), mcl_enchanting.book_offset), 2.5)) do
			if obj:is_player() then
				player_near = true
				player = obj
			end
		end
		if player_near and not old_player_near then
			mcl_enchanting.set_book_animation(self, "opening")
			mcl_enchanting.schedule_book_animation(self, "open")
		elseif old_player_near and not player_near then
			mcl_enchanting.set_book_animation(self, "closing")
			mcl_enchanting.schedule_book_animation(self, "close")
		end
		if player then
			mcl_enchanting.look_at(self, player:get_pos())
		end
		self._player_near = player_near
		mcl_enchanting.check_animation_schedule(self, dtime)
	end,
})

local rotate
if minetest.get_modpath("screwdriver") then
	rotate = screwdriver.rotate_simple
end

minetest.register_node("mcl_enchanting:table", {
	description = S("Enchanting Table"),
	drawtype = "nodebox",
	tiles = {"mcl_enchanting_table_top.png",  "mcl_enchanting_table_bottom.png", "mcl_enchanting_table_side.png", "mcl_enchanting_table_side.png", "mcl_enchanting_table_side.png", "mcl_enchanting_table_side.png"},
	node_box = {
		type = "fixed",
		fixed = {-0.5, -0.5, -0.5, 0.5, 0.25, 0.5},
	},
	sounds = mcl_sounds.node_sound_stone_defaults(),
	groups = {pickaxey = 2, deco_block = 1},
	on_rotate = rotate,
	on_rightclick = function(pos, node, clicker, itemstack, pointed_thing)
		local player_meta = clicker:get_meta()
		local table_meta = minetest.get_meta(pos)
		local num_bookshelves = table_meta:get_int("mcl_enchanting:num_bookshelves")
		local table_name = table_meta:get_string("name")
		if table_name == "" then
			table_name = S("Enchant")
		end
		player_meta:set_int("mcl_enchanting:num_bookshelves", num_bookshelves)
		player_meta:set_string("mcl_enchanting:table_name", table_name)
		mcl_enchanting.show_enchanting_formspec(clicker)
	end,
	on_construct = function(pos)
		local obj = minetest.add_entity(vector.add(pos, mcl_enchanting.book_offset), "mcl_enchanting:book")
		if obj then
			local lua = obj:get_luaentity()
			if lua then
				lua._table_pos = table.copy(pos)
			end
		end
	end,
	on_destruct = function(pos)
		local itemstack = ItemStack("mcl_enchanting:table")
		local meta = minetest.get_meta(pos)
		local itemmeta = itemstack:get_meta()
		itemmeta:set_string("name", meta:get_string("name"))
		itemmeta:set_string("description", meta:get_string("description"))
		minetest.add_item(pos, itemstack)
	end,
	after_place_node = function(pos, placer, itemstack, pointed_thing)
		local meta = minetest.get_meta(pos)
		local itemmeta = itemstack:get_meta()
		meta:set_string("name", itemmeta:get_string("name"))
		meta:set_string("description", itemmeta:get_string("description"))
	end,
	after_destruct = function(pos)
		local objs = minetest.get_objects_inside_radius(pos, 1)
		for o=1, #objs do
			local obj = objs[o]
			local lua = obj:get_luaentity()
			if lua and lua.name == "mcl_enchanting:book" then
				if lua._table_pos and vector.equals(pos, lua._table_pos) then
					obj:remove()
				end
			end
		end
	end,
	drop = "",
	_mcl_blast_resistance = 1200,
	_mcl_hardness = 5,
}) 

minetest.register_craft({
	output = "mcl_enchanting:table",
	recipe = {
		{"", "mcl_books:book", ""},
		{"mcl_core:diamond", "mcl_core:obsidian", "mcl_core:diamond"},
		{"mcl_core:obsidian", "mcl_core:obsidian", "mcl_core:obsidian"}
	}
})

minetest.register_abm({
	label = "Enchanting table bookshelf particles",
	interval = 1,
	chance = 1,
	nodenames = "mcl_enchanting:table",
	action = function(pos)
		mcl_enchanting.check_book(pos)
		local absolute, relative = mcl_enchanting.get_bookshelves(pos)
		for i, ap in ipairs(absolute) do
			if math.random(10) == 1 then
				local rp = relative[i]
				minetest.add_particle({
					pos = ap,
					velocity = vector.subtract(vector.new(0, 5, 0), rp),
					acceleration = {x = 0, y = -9.81, z = 0},
					expirationtime = 2,
					size = 2,
					texture = "mcl_enchanting_glyph_" .. math.random(18) .. ".png"
				})
			end
		end
		minetest.get_meta(pos):set_int("mcl_enchanting:num_bookshelves", math.min(15, #absolute))
	end
}) 

minetest.register_on_mods_loaded(mcl_enchanting.initialize)
minetest.register_on_joinplayer(mcl_enchanting.initialize_player)
minetest.register_on_player_receive_fields(mcl_enchanting.handle_formspec_fields)
table.insert(tt.registered_snippets, 1, mcl_enchanting.enchantments_snippet)