aoc2019/intcode.py

import threading
import time
from collections import deque, defaultdict
from enum import Enum
from typing import List


class IntCodeState(Enum):
    INITIALIZED = 0
    RUNNING = 1
    HALTED = 2


def _get_from_queue(queue: deque, count: int = 1, timeout: int = 10) -> int | List[int] | None:
    started = time.perf_counter()
    while len(queue) < count:
        time.sleep(0.0001)
        if time.perf_counter() - started > timeout:
            raise TimeoutError()

    if count == 1:
        return queue.popleft()
    else:
        return [queue.popleft() for _ in range(count)]


class IntCode(threading.Thread):
    def __init__(self, memory: List[int]):
        super().__init__()
        self.instr_ptr = 0
        self.memory = defaultdict(int)
        for i, v in enumerate(memory):
            self.memory[i] = v
        self.input_queue = deque()
        self.output_queue = deque()
        self.state = IntCodeState.INITIALIZED
        self.relative_base = 0

    def getMemoryValue(self, address: int) -> int:
        return self.memory[address]

    def setMemoryValue(self, address: int, value: int):
        self.memory[address] = value

    def getParameterValue(self, address: int, mode: int = 0) -> int:
        if mode == 0:
            return self.getMemoryValue(self.getMemoryValue(address))
        elif mode == 1:
            return self.getMemoryValue(address)
        elif mode == 2:
            return self.getMemoryValue(self.relative_base + self.getMemoryValue(address))

    def getTargetAddress(self, address: int, mode: int = 0) -> int:
        if mode == 0:
            return self.getMemoryValue(address)
        elif mode == 2:
            return self.getMemoryValue(address) + self.relative_base

    def isRunning(self):
        return self.state == IntCodeState.RUNNING

    def isHalted(self):
        return self.state == IntCodeState.HALTED

    def sendOutputTo(self, target_queue: deque):
        self.output_queue = target_queue

    def addInput(self, value: int):
        self.input_queue.append(value)

    def hasOutput(self):
        return len(self.output_queue) > 0

    def getOutput(self, count: int = 1, timeout: int = 10) -> int | List[int] | None:
        return _get_from_queue(self.output_queue, count, timeout)

    def getInput(self, count: int = 1, timeout: int = 10) -> int | List[int] | None:
        return _get_from_queue(self.input_queue, count, timeout)

    def run(self):
        self.state = IntCodeState.RUNNING
        while not self.isHalted():
            instr = self.getMemoryValue(self.instr_ptr)
            op_code = instr % 100
            p1_mode = instr // 100 % 10
            p2_mode = instr // 1_000 % 10
            p3_mode = instr // 10_000 % 10

            if op_code == 1:  # add
                param1 = self.getParameterValue(self.instr_ptr + 1, p1_mode)
                param2 = self.getParameterValue(self.instr_ptr + 2, p2_mode)
                target_addr = self.getTargetAddress(self.instr_ptr + 3, p3_mode)
                self.setMemoryValue(target_addr, param1 + param2)
                self.instr_ptr += 4
            elif op_code == 2:  # multiply
                param1 = self.getParameterValue(self.instr_ptr + 1, p1_mode)
                param2 = self.getParameterValue(self.instr_ptr + 2, p2_mode)
                target_addr = self.getTargetAddress(self.instr_ptr + 3, p3_mode)
                self.setMemoryValue(target_addr, param1 * param2)
                self.instr_ptr += 4
            elif op_code == 3:  # input
                target_addr = self.getTargetAddress(self.instr_ptr + 1, p1_mode)
                self.setMemoryValue(target_addr, self.getInput())
                self.instr_ptr += 2
            elif op_code == 4:  # output
                self.output_queue.append(self.getParameterValue(self.instr_ptr + 1, p1_mode))
                self.instr_ptr += 2
            elif op_code == 5:  # jump-if-true
                if self.getParameterValue(self.instr_ptr + 1, p1_mode) != 0:
                    self.instr_ptr = self.getParameterValue(self.instr_ptr + 2, p2_mode)
                else:
                    self.instr_ptr += 3
            elif op_code == 6:  # jump-if-false
                if self.getParameterValue(self.instr_ptr + 1, p1_mode) == 0:
                    self.instr_ptr = self.getParameterValue(self.instr_ptr + 2, p2_mode)
                else:
                    self.instr_ptr += 3
            elif op_code == 7:  # less than
                param1 = self.getParameterValue(self.instr_ptr + 1, p1_mode)
                param2 = self.getParameterValue(self.instr_ptr + 2, p2_mode)
                target_addr = self.getTargetAddress(self.instr_ptr + 3, p3_mode)
                self.setMemoryValue(target_addr, param1 < param2)
                self.instr_ptr += 4
            elif op_code == 8:  # equals
                param1 = self.getParameterValue(self.instr_ptr + 1, p1_mode)
                param2 = self.getParameterValue(self.instr_ptr + 2, p2_mode)
                target_addr = self.getTargetAddress(self.instr_ptr + 3, p3_mode)
                self.setMemoryValue(target_addr, param1 == param2)
                self.instr_ptr += 4
            elif op_code == 9:
                param1 = self.getParameterValue(self.instr_ptr + 1, p1_mode)
                self.relative_base += param1
                self.instr_ptr += 2
            elif op_code == 99:
                self.state = IntCodeState.HALTED
                return
            else:
                raise ValueError("Invalid instruction encountered at pos %d: %d" % (self.instr_ptr, instr))