local kits_cache = {}
local kits_give_timers = {}
local path = minetest.get_worldpath()

local kit_privs = minetest.settings:get_bool("ess_privilege_per_kit", false)
local kit_give = minetest.settings:get("ess_default_kit")
if not kit_give then kit_give = "" end

local function load_from_file()
	local file = io.open(path.."/kits.ref")
	if not file then return end

	local str = ""
	for line in file:lines() do
		str = str..line
	end

	file:close()
	kits_cache = minetest.deserialize(str)
	if not kits_cache then
		kits_cache = {}
	end

	for kit in pairs(kits_cache) do
		minetest.register_privilege("ess.kits.kit." .. kit, {
			description = "Kit " .. kit,
			give_to_singleplayer = false,
		})
	end
end

local function write_to_file()
	local data = minetest.serialize(kits_cache)
	minetest.safe_file_write(path.."/kits.ref", data)
end

local function give_kit(player, kit)
	kit = kit:lower()
	if not kits_cache[kit] then return false, "Invalid kit name." end
	if type(player) == "string" then
		player = minetest.get_player_by_name(player)
	end

	if not player then return false, "Invalid player." end

	local pname = player:get_player_name()
	local allprivs = ess.priv_match(pname, "ess.kits.kits.all")
	if kit_privs and not ess.priv_match(pname, "ess.kits.kit." .. kit) and 
			not allprivs and kit ~= kit_give then
		return false, "Insufficient permissions."
	end

	local kdata = kits_cache[kit]

	if kits_give_timers[pname] and kits_give_timers[pname][kit] and kdata._timeout and 
			kits_give_timers[pname][kit] > minetest.get_gametime() - kdata._timeout and not allprivs then
		return false, string.format("You have to wait %d more seconds before giving this kit again.",
			(kdata._timeout + (kits_give_timers[pname][kit] - minetest.get_gametime())))
	end

	local inv = player:get_inventory()
	local stacks_to_discard = {}
	for i,tbl in pairs(kdata) do
		if i ~= "_timeout" then
			local stack = ItemStack(tbl)
			if inv:room_for_item("main", stack) then
				inv:add_item("main", stack)
			else
				table.insert(stacks_to_discard, stack)
			end
		end
	end

	if not kits_give_timers[pname] then
		kits_give_timers[pname] = {}
	end
	kits_give_timers[pname][kit] = minetest.get_gametime()

	return true, stacks_to_discard
end

local function cmd_create(name, param, splitparams)
	if param == "" or kits_cache[param] then
		return false, "Invalid name for kit."
	end

	local player = minetest.get_player_by_name(name)
	local inv = player:get_inventory()
	local stacks = {}
	for _,stack in pairs(inv:get_list("main")) do
		if not stack:is_empty() then
			table.insert(stacks, stack:to_table())
		end
	end

	if #stacks == 0 then
		return false, "Please put some items in your inventory before attempting to create a kit!"
	end

	local timeout = tonumber(splitparams[2])
	local kitname = splitparams[1]:lower()

	kits_cache[kitname] = stacks

	if timeout then
		kits_cache[kitname]._timeout = timeout
	end

	write_to_file()

	return true, "Successfully created the kit \""..kitname.."\"!"
end

local function cmd_delete(name, param)
	if param == "" or not kits_cache[param] then
		return false, "Invalid name for kit."
	end

	kits_cache[param] = nil
	write_to_file()

	return true, "Successfully removed the kit."
end

local function cmd_kits(name, param, splitparams)
	-- Include convenience functions in this command
	local fst = splitparams[1]
	if fst == "create" or fst == "make" or fst == "remove" or fst == "delete" then
		if not ess.priv_match(name, "ess.kits.create") then
			return ess.reject_permission()
		end

		if fst == "create" or fst == "make" then
			return cmd_create(name, splitparams[2], {splitparams[2], splitparams[3]})
		else
			return cmd_delete(name, splitparams[2], {splitparams[2], splitparams[3]})
		end
	end

	-- Give a specific kit
	if param ~= "" then
		local target = name
		if splitparams[2] and splitparams[2] ~= name and not ess.priv_match(name, "ess.kits.other") then
			return ess.reject_permission()
		end

		local give, leftover = give_kit(target, param)
		if not give then
			return false, "Could not give kit. " .. leftover
		end

		return true, "Kit given successfully."
	end

	-- List available kits
	local available = {}
	for kit in pairs(kits_cache) do
		local perms = true
		if kit_privs then
			perms = ess.priv_match(name, "ess.kits.kit." .. kit) or ess.priv_match(name, "ess.kits.kits.all")
		end

		if perms then
			table.insert(available, kit)
		end
	end

	return true, "Kits: " .. table.concat(available, ", ")
end

local commands = {
	["kits"] = {
		description = "Give or list available kits",
		params = "(delete|create) <kit> [<timeout>] | [<kit>] [<playername>]",
		aliases = {"kit"},
		privs = {
			["ess.kits.kits"] = true,
			["ess.kits.kits.all"] = true,
			["ess.kits.other"] = true,
		},
		func = cmd_kits,
	},
	["createkit"] = {
		description = "Create a kit from the items in your inventory",
		params = "<kitname> [<timeout>]",
		aliases = {"mkkit", "addkit"},
		privs = {
			["ess.kits.create"] = true,
		},
		func = cmd_create,
	},
	["deletekit"] = {
		description = "Delete a kit",
		params = "<kitname>",
		aliases = {"rmkit", "delkit"},
		privs = {
			["ess.kits.create"] = true,
		},
		func = cmd_delete,
	}
}

ess.autoregister(commands, "kits")

if kit_give ~= "" then
	minetest.register_on_newplayer(function(player)
		give_kit(player, kit_give)
	end)
end

-- Load for the first time
load_from_file()