import enum
import struct
import logging
import datetime

from spacepackets.ecss import PusTelecommand, PusService

from tmtccmd.tmtc import DefaultPusQueueHelper
from tmtccmd.config import CmdTreeNode


_LOGGER = logging.getLogger(__name__)


class Subservice(enum.IntEnum):
    SET_TIME = 128
    DUMP_TIME = 129
    RELATIVE_TIMESHIFT = 130


class CmdStr:
    SET_CURRENT_TIME = "set_curr_time"
    RELATIVE_TIMESHIFT = "relative_timeshift"
    DUMP_TIME = "dump_time"


class Info:
    SET_CURRENT_TIME = "Setting current time in ASCII format"
    RELATIVE_TIMESHIFT = "Shift time with a relative offset"
    DUMP_TIME = "Dump system time as event"


def pack_time_management_cmd(q: DefaultPusQueueHelper, cmd_str: str):
    if cmd_str == CmdStr.SET_CURRENT_TIME:
        current_time = (
            datetime.datetime.now(datetime.timezone.utc).isoformat() + "Z" + "\0"
        )
        current_time_ascii = current_time.encode("ascii")
        _LOGGER.info(f"Current time in ASCII format: {current_time_ascii}")
        q.add_log_cmd(Info.SET_CURRENT_TIME)
        q.add_pus_tc(
            PusTelecommand(
                service=PusService.S9_TIME_MGMT,
                subservice=Subservice.SET_TIME,
                app_data=current_time_ascii,
            )
        )
    elif cmd_str == CmdStr.RELATIVE_TIMESHIFT:
        nanos = int(input("Specify relative timeshift in nanoseconds: "))
        nanos_packed = struct.pack("!q", nanos)
        q.add_log_cmd(Info.RELATIVE_TIMESHIFT)
        q.add_pus_tc(
            PusTelecommand(
                service=PusService.S9_TIME_MGMT,
                subservice=Subservice.RELATIVE_TIMESHIFT,
                app_data=nanos_packed,
            )
        )
    elif cmd_str == CmdStr.DUMP_TIME:
        q.add_log_cmd(Info.DUMP_TIME)
        q.add_pus_tc(
            PusTelecommand(
                service=PusService.S9_TIME_MGMT, subservice=Subservice.DUMP_TIME
            )
        )


def create_time_node() -> CmdTreeNode:
    time_node = CmdTreeNode("time", "Time Management")
    time_node.add_child(CmdTreeNode(CmdStr.SET_CURRENT_TIME, "Set current time"))
    time_node.add_child(CmdTreeNode(CmdStr.DUMP_TIME, "Dumpy current time"))
    time_node.add_child(CmdTreeNode(CmdStr.RELATIVE_TIMESHIFT, Info.RELATIVE_TIMESHIFT))
    return time_node