# -*- coding: utf-8 -*-
import re
from abc import ABC
from collections import namedtuple
from dataclasses import dataclass, field
from typing import Tuple, Iterator, Any, Set, Union
from typing import Tuple, Iterator, Any, Set, List

from aoc import BaseAssignment


class Coordinate(namedtuple("Coordinate", ["x", "y"])):
    def distance(self, other: "Coordinate"):
        return abs(self.x - other.x) + abs(self.y - other.y)


@dataclass
class Sensor:
    coordinate: Coordinate
    nearest: Coordinate
    radius: int = None

    def __hash__(self):
        return hash(self.coordinate)

    def __post_init__(self):
        self.radius = self.coordinate.distance(self.nearest)

    def within_radius(self, coordinate: Coordinate) -> bool:
        distance = self.coordinate.distance(coordinate)
        return distance <= self.radius

    def x_coordinates_within_radius_at(self, y: int, map: "Map") -> Union[range, list]:

        coordinate = Coordinate(self.coordinate.x, y)

        if not self.within_radius(coordinate):
            return []

        dy = abs(self.coordinate.y - y)
        left_over = self.radius - dy

        return range(
            max(self.coordinate.x - left_over, map.width[0]),
            min(self.coordinate.x + left_over + 1, map.width[-1]),
        )


@dataclass
class Map:
    sensors: List[Sensor] = field(default_factory=list)
    beacons: Set[Coordinate] = field(default_factory=set)

    def __post_init__(self):
        all_coordinates = self.beacons | {sensor.coordinate for sensor in self.sensors}

        min_x = min(c.x for c in all_coordinates)
        max_x = max(c.x for c in all_coordinates)
        min_y = min(c.y for c in all_coordinates)
        max_y = max(c.y for c in all_coordinates)

        self.width = list(range(min_x, max_x + 1))
        self.height = list(range(min_y, max_y + 1))


input_pattern = re.compile("x=(-?[-0-9]+), y=(-?[0-9]+)")


class Assignment(BaseAssignment[int, Tuple[Sensor, Coordinate]], ABC):
    def parse_item(self, line: str) -> Tuple[Sensor, Coordinate]:
        match = input_pattern.findall(line)

        if len(match) != 2:
            raise RuntimeError()

        sensor_match, beacon_match = match

        beacon = Coordinate(int(beacon_match[0]), int(beacon_match[1]))
        sensor = Sensor(Coordinate(int(sensor_match[0]), int(sensor_match[1])), beacon)

        return sensor, beacon

    def create_map(self, input: Iterator[Tuple[Sensor, Coordinate]]) -> Map:
        sensors = list()
        beacons = set()

        for sensor, beacon in input:
            sensors.append(sensor)
            beacons.add(beacon)

        return Map(sensors, beacons)


class AssignmentOne(Assignment):
    example_result = 26
    example_kwargs = {"y": 10}

    # Wrong: 4062163

    def run(self, input: Iterator[Tuple[Sensor, Coordinate]], y=2000000):
        map = self.create_map(input)

        x_coordinates = {
            x
            for sensor in map.sensors
            for x in sensor.x_coordinates_within_radius_at(y, map)
        }

        return len(x_coordinates) - len(
            [beacon.x for beacon in map.beacons if beacon.y == y]
        )


class AssignmentTwo(Assignment):
    pass