const fs = require('fs');

// const inputArray = fs.readFileSync('sample.txt').toString().split("\n");
const inputArray = fs.readFileSync('input.txt').toString().split("\n");

// Part One

const lineCount = inputArray.length;
const realPartNumbers = [];

for (i in inputArray) {
  let line = inputArray[i];
  const lineLength = line.length;
  const possiblePartNumbers = [];
  const parsedLine = line.split(/\D+/g);
  for (part of parsedLine) {
    !!parseInt(part) && possiblePartNumbers.push(parseInt(part));
  }

  for (part of possiblePartNumbers) {
    let isRealPart = false;
    const regex = new RegExp(`(?<!\\d)${part}(?!\\d)`);
    const startingPosition = line.search(regex);
    line = line.replace(part, '0'.repeat(part.toString().length)); // dang duplicates
    const endingPosition = startingPosition + part.toString().length - 1;
    if (startingPosition > 0 && line[startingPosition - 1] !== ".") {
      isRealPart = true;
    }
    if (endingPosition < lineLength - 1 && line[endingPosition + 1] !== "." && !isRealPart) {
      isRealPart = true;
    }
    if (i > 0  && !isRealPart) {
      let stringAbove = inputArray[i - 1].substring(startingPosition === 0 ? startingPosition : startingPosition - 1, endingPosition != lineLength - 1 ? endingPosition + 2 : undefined);
      stringAbove = stringAbove.replaceAll(".", "0");
      for (char of stringAbove) {
        if (!parseInt(char) && parseInt(char) !== 0) {
          isRealPart = true;
        }
      };
    }
    if (i < lineCount - 1  && !isRealPart) {
      let stringBelow = inputArray[parseInt(i) + 1].substring(startingPosition === 0 ? startingPosition : startingPosition - 1, endingPosition !== lineLength - 1 ? endingPosition + 2 : undefined);
      stringBelow = stringBelow.replaceAll(".", "0");
      for (char of stringBelow) {
        if (!parseInt(char) && parseInt(char) !== 0) {
          isRealPart = true;
        }
      };
    }

    if (isRealPart) {
      realPartNumbers.push(part);
    }
  }

}

console.log(realPartNumbers.reduce((a, b) => a + b, 0));


// Part Two

for (i in inputArray) {
  const contents = inputArray[i].split(" ");

}


console.log();

// functions