{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "{-# LANGUAGE NegativeLiterals #-}\n",
    "{-# LANGUAGE FlexibleContexts #-}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "import Text.Parsec hiding (State)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "instructionLine = many (up <|> down)\n",
    "\n",
    "up   = char '(' *> pure  1\n",
    "down = char ')' *> pure -1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "parseIline :: String -> Either ParseError [Int]\n",
    "parseIline input = parse instructionLine \"(unknown)\" input\n",
    "\n",
    "successfulParse :: Either ParseError [a] -> [a]\n",
    "successfulParse (Left _) = []\n",
    "successfulParse (Right a) = a"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "part1 :: [Int] -> IO ()\n",
    "part1 instructions = do\n",
    "        print $ sum instructions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "part2 :: [Int] -> IO ()\n",
    "part2 instructions = do\n",
    "        print $ length $ takeWhile (>= 0) $ scanl (+) 0 instructions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "main :: IO ()\n",
    "main = do \n",
    "        text <- readFile \"../../data/advent01.txt\"\n",
    "        let instructions = successfulParse $ parseIline text\n",
    "        part1 instructions\n",
    "        part2 instructions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "138\n",
       "1771"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "main"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Haskell",
   "language": "haskell",
   "name": "haskell"
  },
  "language_info": {
   "codemirror_mode": "ihaskell",
   "file_extension": ".hs",
   "name": "haskell",
   "version": "8.0.2"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}