{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import operator\n",
    "from collections import defaultdict\n",
    "from dataclasses import dataclass\n",
    "from typing import Callable\n",
    "\n",
    "operators = {\n",
    "    \"inc\": operator.add,\n",
    "    \"dec\": operator.sub,\n",
    "}\n",
    "\n",
    "comparisons = {\n",
    "    \"<\": operator.lt,\n",
    "    \"<=\": operator.le,\n",
    "    \"==\": operator.eq,\n",
    "    \"!=\": operator.ne,\n",
    "    \">=\": operator.ge,\n",
    "    \">\": operator.gt,\n",
    "}\n",
    "\n",
    "\n",
    "def parse_op(op):\n",
    "    reg, op, value = op.split()\n",
    "    value = int(value)\n",
    "    op = operators[op]\n",
    "    return (\n",
    "        lambda registers: operator.setitem(registers, reg, op(registers[reg], value))\n",
    "        or registers[reg]\n",
    "    )\n",
    "\n",
    "\n",
    "def parse_cond(cond):\n",
    "    reg, cond, target = cond.split()\n",
    "    target = int(target)\n",
    "    cond = comparisons[cond]\n",
    "    return lambda registers: cond(registers[reg], target)\n",
    "\n",
    "\n",
    "@dataclass\n",
    "class Instruction(object):\n",
    "    line: str\n",
    "    operation: Callable[[dict], int]\n",
    "    condition: Callable[[dict], bool]\n",
    "\n",
    "    @classmethod\n",
    "    def from_line(cls, line):\n",
    "        line = line.strip()\n",
    "        instr, cond = line.split(\"if\")\n",
    "        return cls(line, parse_op(instr.strip()), parse_cond(cond.strip()))\n",
    "\n",
    "    def execute(self, registers):\n",
    "        if self.condition(registers):\n",
    "            return self.operation(registers)\n",
    "        return 0\n",
    "\n",
    "\n",
    "def read_program(lines):\n",
    "    return [Instruction.from_line(line) for line in lines if line.strip()]\n",
    "\n",
    "\n",
    "def largest_register_value(program):\n",
    "    registers = defaultdict(int)\n",
    "    return (max(instr.execute(registers) for instr in program), max(registers.values()))\n",
    "\n",
    "\n",
    "test_program = read_program(\n",
    "    \"\"\"\\\n",
    "b inc 5 if a > 1\n",
    "a inc 1 if b < 5\n",
    "c dec -10 if a >= 1\n",
    "c inc -20 if c == 10\n",
    "\"\"\".splitlines()\n",
    ")\n",
    "\n",
    "assert largest_register_value(test_program) == (10, 1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "import aocd\n",
    "\n",
    "data = aocd.get_data(day=8, year=2017)\n",
    "program = read_program(data.splitlines())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Part 1: 5946\n",
      "Part 2: 6026\n"
     ]
    }
   ],
   "source": [
    "high_water_line, final_max = largest_register_value(program)\n",
    "print(\"Part 1:\", final_max)\n",
    "print(\"Part 2:\", high_water_line)"
   ]
  }
 ],
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