aliases = {}

-- http://lua-users.org/wiki/CopyTable
function deepcopy(orig)
    local orig_type = type(orig)
    local copy
    if orig_type == 'table' then
        copy = {}
        for orig_key, orig_value in next, orig, nil do
            copy[deepcopy(orig_key)] = deepcopy(orig_value)
        end
        setmetatable(copy, deepcopy(getmetatable(orig)))
    else -- number, string, boolean, etc
        copy = orig
    end
    return copy
end

-- https://github.com/Uberi/Minetest-WorldEdit/blob/master/worldedit_shortcommands/init.lua
-- function alias(short, orig, params)
    -- -- params = params or ""
    -- local def = minetest.chatcommands[orig]
    -- -- minetest.log(params or (orig .. ": no params"))
    -- minetest.log("verbose", orig)
    -- -- minetest.debug(orig)
    -- if params then
        -- def = deepcopy(def)
        -- def.params = params
    -- end
	-- if not minetest.chatcommands[orig] then
		-- minetest.log("error", "custom_aliases: original command " .. orig .. " does not exist")
		-- return true
	-- end
	-- if minetest.chatcommands[short] then
		-- minetest.log("error", "custom_aliases: alias " .. short .. " already exists")
		-- return true
	-- end
	-- -- minetest.register_chatcommand(short, minetest.chatcommands[orig])
	-- minetest.register_chatcommand(short, def)
	-- return false
-- end

function alias(short, orig, param)
    aliases[short] = {
        orig = orig,
        param = param or ""
    }
end

alias("gim", "giveme")
alias("grm", "grantme")
-- needs to be in minetest game?
-- alias("h", "home")
alias("sd", "shutdown")
alias("t", "teleport")
alias("t0", "teleport", "0 0 0")

minetest.register_on_chat_message(function(name, message)
    -- minetest.chat_send_player(name, "Alias")
    minetest.chat_send_player(name, "Alias")

	if message:sub(1,1) ~= "/" then
		return
	end

	local cmd, param = string.match(message, "^/([^ ]+) *(.*)")
	if not cmd then
		-- minetest.chat_send_player(name, "-!- Empty command")
		return true
	end

	param = param or ""

	local cmd_def = minetest.registered_chatcommands[cmd]
	local alias_def = aliases[cmd]
	if not cmd_def and alias_def then
        minetest.chat_send_player(name, "Alias " .. cmd .. "= " .. alias_def.orig)
        cmd_def = minetest.registered_chatcommands[alias_def.orig]
        if not cmd_def then
            minetest.chat_send_player(name, "-!- Invalid alias: " .. cmd)
            return true
        end

        local has_privs, missing_privs = minetest.check_player_privs(name, cmd_def.privs)
        if has_privs then
            minetest.set_last_run_mod(cmd_def.mod_origin)
            local success, message = cmd_def.func(name, param)
            if message then
                minetest.chat_send_player(name, message)
            end
        else
            minetest.chat_send_player(name, "You don't have permission"
                    .. " to run this command (missing privileges: "
                    .. table.concat(missing_privs, ", ") .. ")")
        end
        return true  -- Handled chat message
	end
end)