#!/usr/bin/env python3

import datetime
from collections import defaultdict
import enum
import logging
import re
import sys
from typing import Dict, List

import argparse_utils
import bootstrap
import config
import dict_utils
import exec_utils

logger = logging.getLogger(__name__)

cfg = config.add_commandline_args(
    f"Presence Detection ({__file__})",
    "Args related to detection of human beings in locations.",
)
cfg.add_argument(
    "--presence_macs_file",
    type=argparse_utils.valid_filename,
    default = "/home/scott/cron/persisted_mac_addresses.txt",
    metavar="FILENAME",
    help="The location of persisted_mac_addresses.txt to use."
)


class Person(enum.Enum):
    UNKNOWN = 0
    SCOTT = 1
    LYNN = 2
    ALEX = 3
    AARON_AND_DANA = 4
    AARON = 4
    DANA = 4


@enum.unique
class Location(enum.Enum):
    UNKNOWN = 0
    HOUSE = 1
    CABIN = 2


class PresenceDetection(object):
    def __init__(self) -> None:
        # Note: list most important devices first.
        self.devices_by_person: Dict[Person, List[str]] = {
            Person.SCOTT: [
                "3C:28:6D:10:6D:41",
                "D4:61:2E:88:18:09",
                "6C:40:08:AE:DC:2E",
                "14:7D:DA:6A:20:D7",
            ],
            Person.LYNN: [
                "08:CC:27:63:26:14",
                "B8:31:B5:9A:4F:19",
            ],
            Person.ALEX: [
                "0C:CB:85:0C:8B:AE",
                "D0:C6:37:E3:36:9A",
            ],
            Person.AARON_AND_DANA: [
                "98:B6:E9:E5:5A:7C",
                "D6:2F:37:CA:B2:9B",
                "6C:E8:5C:ED:17:26",
                "90:E1:7B:13:7C:E5",
                "6E:DC:7C:75:02:1B",
                "B2:16:1A:93:7D:50",
                "18:65:90:DA:3A:35",
                "22:28:C8:7D:3C:85",
                "B2:95:23:69:91:F8",
                "96:69:2C:88:7A:C3",
            ],
        }
        self.location_ts_by_mac: Dict[
            Location, Dict[str, datetime.datetime]
        ] = defaultdict(dict)
        self.names_by_mac: Dict[str, str] = {}
        persisted_macs = config.config['presence_macs_file']
        self.read_persisted_macs_file(persisted_macs, Location.HOUSE)
        raw = exec_utils.cmd(
            "ssh scott@meerkat.cabin 'cat /home/scott/cron/persisted_mac_addresses.txt'"
        )
        self.parse_raw_macs_file(raw, Location.CABIN)
        # os.remove(filename)

    def read_persisted_macs_file(
        self, filename: str, location: Location
    ) -> None:
        if location is Location.UNKNOWN:
            return
        with open(filename, "r") as rf:
            lines = rf.read()
        self.parse_raw_macs_file(lines, location)

    def parse_raw_macs_file(self, raw: str, location: Location) -> None:
        lines = raw.split("\n")

        # CC:F4:11:D7:FA:EE, 2240, 10.0.0.22 (side_deck_high_home), Google, 1611681990
        for line in lines:
            line = line.strip()
            if len(line) == 0:
                continue
            logger.debug(f'{location}> {line}')
            try:
                (mac, count, ip_name, mfg, ts) = line.split(",")
            except Exception as e:
                logger.error(f'SKIPPED BAD LINE> {line}')
                logger.exception(e)
                continue
            mac = mac.strip()
            (self.location_ts_by_mac[location])[
                mac
            ] = datetime.datetime.fromtimestamp(int(ts.strip()))
            ip_name = ip_name.strip()
            match = re.match(r"(\d+\.\d+\.\d+\.\d+) +\(([^\)]+)\)", ip_name)
            if match is not None:
                name = match.group(2)
                self.names_by_mac[mac] = name

    def is_anyone_in_location_now(self, location: Location) -> bool:
        for person in Person:
            if person is not None:
                loc = self.where_is_person_now(person)
                if location == loc:
                    return True
        return False

    def where_is_person_now(self, name: Person) -> Location:
        if name is Person.UNKNOWN:
            return Location.UNKNOWN
        votes: Dict[Location, int] = {}
        tiebreaks: Dict[Location, datetime.datetime] = {}
        credit = 10000
        for mac in self.devices_by_person[name]:
            if mac not in self.names_by_mac:
                continue
            for location in self.location_ts_by_mac:
                if mac in self.location_ts_by_mac[location]:
                    ts = (self.location_ts_by_mac[location])[mac]
                    tiebreaks[location] = ts
            location = dict_utils.key_with_min_value(tiebreaks)
            v = votes.get(location, 0)
            votes[location] = v + credit
            credit = int(
                credit * 0.667
            )  # Note: list most important devices first
            if credit == 0:
                credit = 1
        if len(votes) > 0:
            item = dict_utils.item_with_max_value(votes)
            return item[0]
        return Location.UNKNOWN


@bootstrap.initialize
def main() -> None:
    config.parse()
    p = PresenceDetection()

    for loc in Location:
        print(f'{loc}: {p.is_anyone_in_location_now(loc)}')

    for u in Person:
        print(f'{u}: {p.where_is_person_now(u)}')
    sys.exit(0)


if __name__ == '__main__':
    main()