{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "sophisticated-processing",
   "metadata": {},
   "outputs": [],
   "source": [
    "import networkx as nx\n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "INPUT = 'Input'\n",
    "\n",
    "def value(wires, token):\n",
    "    try:\n",
    "        value = int(token)\n",
    "    except ValueError:\n",
    "        value = wires.get(token, 0)\n",
    "\n",
    "    return value\n",
    "\n",
    "mask = 0xffff\n",
    "\n",
    "def compute(wires, tokens):\n",
    "    if len(tokens) == 1:\n",
    "        return value(wires, tokens[0])\n",
    "    if tokens[0] == 'NOT':\n",
    "        return mask - value(wires, tokens[1])\n",
    "    if tokens[1] == 'AND':\n",
    "        return value(wires, tokens[0]) & value(wires, tokens[2])\n",
    "    if tokens[1] == 'OR':\n",
    "        return value(wires, tokens[0]) | value(wires, tokens[2])\n",
    "    if tokens[1] == 'LSHIFT':\n",
    "        return (value(wires, tokens[0]) << value(wires, tokens[2])) & mask\n",
    "    if tokens[1] == 'RSHIFT':\n",
    "        return value(wires, tokens[0]) >> value(wires, tokens[2])\n",
    "    assert False\n",
    "\n",
    "def run(wires, s):\n",
    "    if not s:\n",
    "        return\n",
    "    tokens = s.split()\n",
    "    wires[tokens[-1]] = compute(wires, tokens[:-2])\n",
    "\n",
    "\n",
    "def add_to_graph(dg, s):\n",
    "    if not s:\n",
    "        return\n",
    "    tokens = s.split()\n",
    "    input1 = None\n",
    "    input2 = None\n",
    "    output = tokens[-1]\n",
    "    tokens = tokens[:-2]\n",
    "    if len(tokens) == 1:\n",
    "        if tokens[0].isdigit():\n",
    "            input1 = INPUT\n",
    "        else:\n",
    "            input1 = tokens[0]\n",
    "    elif tokens[0] == 'NOT':\n",
    "        if tokens[1].isdigit():\n",
    "            input1 = INPUT\n",
    "        else:\n",
    "            input1 = tokens[1]\n",
    "    else:\n",
    "        input1 = tokens[0]\n",
    "        input2 = tokens[2]\n",
    "\n",
    "    if input1 and not input1.isdigit():\n",
    "        dg.add_edge(output, input1, code = s)\n",
    "    if input2 and not input2.isdigit():\n",
    "        dg.add_edge(output, input2, code = s)\n",
    "\n",
    "\n",
    "def run_graph(wires, dg):\n",
    "    nodes = reversed(list(nx.topological_sort(nx.line_graph(dg))))\n",
    "    for (fn, tn) in nodes:\n",
    "        run(wires, dg[fn][tn].get('code', ''))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "south-candidate",
   "metadata": {},
   "outputs": [],
   "source": [
    "wires = {}\n",
    "instructions = \"\"\"123 -> x\n",
    "456 -> y\n",
    "x AND y -> d\n",
    "x OR y -> e\n",
    "x LSHIFT 2 -> f\n",
    "y RSHIFT 2 -> g\n",
    "NOT x -> h\n",
    "NOT y -> i\"\"\"\n",
    "dg = nx.DiGraph()\n",
    "for s in instructions.splitlines():\n",
    "   add_to_graph(dg, s)\n",
    "run_graph(wires, dg)\n",
    "assert value(wires, 'd') == 72\n",
    "assert value(wires, 'e') == 507\n",
    "assert value(wires, 'f') == 492\n",
    "assert value(wires, 'g') == 114\n",
    "assert value(wires, 'h') == 65412\n",
    "assert value(wires, 'i') == 65079\n",
    "assert value(wires, 'x') == 123\n",
    "assert value(wires, 'y') == 456"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "difficult-wells",
   "metadata": {},
   "outputs": [],
   "source": [
    "import import_ipynb\n",
    "import helper\n",
    "s = helper.read_file('2015_7.txt')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "existing-pittsburgh",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "956\n",
      "40149\n"
     ]
    }
   ],
   "source": [
    "wires = {}\n",
    "dg = nx.DiGraph()\n",
    "for instr in s.splitlines():\n",
    "    add_to_graph(dg, instr)\n",
    "\n",
    "run_graph(wires, dg)\n",
    "print(wires['a'])\n",
    "\n",
    "wires = {'b': wires['a']}\n",
    "dg.remove_node(INPUT)\n",
    "run_graph(wires, dg)\n",
    "print(wires['a'])"
   ]
  }
 ],
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  "title": "Some Assembly Required"
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