OUTPUT = ":"
INPUT = ">"

local current_log_filepath = nil
local current_log_file = nil

local get_current_log_filepath = function()
    local date = os.date("%Y-%m-%d")
    local data_home = os.getenv("XDG_DATA_HOME") or string.format("%s/.local/share", os.getenv("HOME"))
    return string.format("%s/blightmud/logs/batmud/%s/%s.log", data_home, os.getenv("BATMUD_CHAR"), date)
end

local write_log = function(line, type)
    local path = get_current_log_filepath()
    if current_log_filepath == nil or current_log_filepath ~= path then
        current_log_filepath = path
        os.execute(string.format("mkdir -p %q", path:match("^(.*)/[^/]+$")))
        current_log_file = assert(io.open(path, "a"))
    end

    local log_line = cformat("<black>[%s]%s<reset> %s\n", os.date("%H:%M:%S"), type, line)
    if current_log_file ~= nil then
        assert(current_log_file:write(log_line))
        assert(current_log_file:flush())
    end
end

mud.add_output_listener(function(line)
    if not line:skip_log() then
        if line:replacement() == nil then
            write_log(line:raw(), OUTPUT)
        else
            write_log(line:replacement(), OUTPUT)
        end
    end
    return line
end)

mud.add_input_listener(function(line)
    if not line:skip_log() then
        write_log(line:raw(), INPUT)
    end
    return line
end)