const fs = require("fs");
const forwardRegex = /XMAS/g;
const backwardRegex = /SAMX/g;
const input = fs.readFileSync("input.txt", "utf-8");
const inputArr = input.split("\n");
let totalMatches = 0;
// console.log(inputArr)
// const forwardMatchs = input.match(forwardRegex)
// console.log(input)
// console.log(forwardMatchs.length)
//create a sliding window to match the words

// for (row of inputArr) {
//   // console.log(row)
//   const forwardMatches = row.match(forwardRegex);
//   const backwordsMatches = row.match(backwardRegex);

//   if (forwardMatches) {
//     totalMatches += forwardMatches.length;
//   }
//   if (backwordsMatches) {
//     totalMatches += backwordsMatches.length;
//   }
// }

// console.log(inputArr)
const maxRows = inputArr.length;
const maxLetters = inputArr[0].length;

//horizontal words
for (let x = 0; x < maxRows; x++) {
  for (let y = 0; y + 3 <= maxLetters; y++) {
    const word = inputArr[x][y] + inputArr[x][y + 1] + inputArr[x][y + 2] + inputArr[x][y + 3];
    if (forwardRegex.test(word) || backwardRegex.test(word)) {
      totalMatches++;
    }
  }
}

//vertical words
for (let x = 0; x + 3 < maxRows; x++) {
  for (let y = 0; y <= maxLetters; y++) {
    const word = inputArr[x][y] + inputArr[x + 1][y] + inputArr[x + 2][y] + inputArr[x + 3][y];
    if (forwardRegex.test(word) || backwardRegex.test(word)) {
      totalMatches++;
    }
  }
}
//angled words 1
for (let x = 0; x + 4 < maxRows; x++) {
  for (let y = 0; y +3< maxLetters; y++) {
    const word = inputArr[x][y] + inputArr[x + 1][y + 1] + inputArr[x + 2][y + 2] + inputArr[x + 3][y + 3];
    if (forwardRegex.test(word) || backwardRegex.test(word)) {
      totalMatches++;
    }
  }
}
//angled words 2
for (let x = 0; x + 4 < maxRows; x++) {
  for (let y = 0; y +3< maxLetters; y++) {
    const word = inputArr[x][y+3] + inputArr[x+1][y + 2] + inputArr[x + 2][y + 1] + inputArr[x+3][y];
    if (forwardRegex.test(word) || backwardRegex.test(word)) {
      totalMatches++;
    }
    console.log(word);
  }
}

console.log("totalMatches: ", totalMatches);