local warpcache = nil

local function get_warps()
	local p = ess.get_world_meta("warps")
	if not p then
		p = {}
	end
	for name,pos in pairs(p) do
		if type(pos) == "string" then
			p[name] = minetest.string_to_pos(pos)
		end
	end
	warpcache = p
	return p
end

local function save_warps()
	if not warpcache then return end
	local e = table.copy(warpcache)
	for name,pos in pairs(e) do
		e[name] = minetest.pos_to_string(pos)
	end
	ess.set_world_meta("warps", e)
end

local function warp_exists(name)
	if not warpcache then get_warps() end
	if not warpcache[name:lower()] then return nil end
	return warpcache[name:lower()]
end

local function set_warp(name, pos)
	name = name:lower()
	if not warpcache then get_warps() end
	warpcache[name] = pos
	save_warps()
end

local function cmd_warp(name,params,splitparams)
	if params == "" then
		if not warpcache then get_warps() end
		local warps = {}
		for name in pairs(warpcache) do
			table.insert(warps, name)
		end
		return true, "Warps: " .. table.concat(warps, ", ")
	end

	local warpee = name
	local location = params
	if #splitparams > 1 then
		if splitparams[1] ~= name and not ess.priv_match(name, "ess.warp.warp.other") then
			return false, "You do not have permission to warp other players!"
		else
			warpee = splitparams[1]
			location = splitparams[2]
		end
	end

	local exists = warp_exists(location)
	if not exists then
		return false, "Warp \""..location.."\" not found."
	end

	local user = minetest.get_player_by_name(warpee)
	if not user then
		return false, "No such user."
	end

	user:set_pos(exists)
	return true, "Warped to "..location.."."
end

local function cmd_setwarp(name,params,splitparams)
	local user = minetest.get_player_by_name(name)
	local pos = user:get_pos()
	set_warp(splitparams[1], pos)
	return true, "Successfully set the warp point."
end

local function cmd_delwarp(name,params,splitparams)
	local location = splitparams[1]
	local exists = warp_exists(location:lower())
	if not exists then
		return false, "Warp \""..location.."\" not found."
	end
	warpcache[location] = nil
	save_warps()
	return true, "Successfully removed the warp point."
end

local commands = {
	["warp"] = {
		description = "Warp to a location.",
		params = "[<player>] <location>",
		aliases = {"warps"},
		privs = {
			["ess.warp.warp"] = true,
			["ess.warp.warp.other"] = true,
		},
		save_player_pos = true,
		func = cmd_warp,
	},
	["setwarp"] = {
		description = "Set a warp to the current location.",
		params = "<location>",
		privs = true,
		func = cmd_setwarp,
	},
	["delwarp"] = {
		description = "Remove a warp point.",
		params = "<location>",
		privs = true,
		func = cmd_delwarp,
	}
}

ess.autoregister(commands, "warp")