import fs from "node:fs";
import { Temporal } from "@js-temporal/polyfill";
import { printTime } from "../util";

const data = fs.readFileSync("./inputs/input", "utf8");

let timer = Temporal.Now.instant();

console.log(
  "part one:",
  data
    .split("\n")
    .slice(0, -1) // remove empty trailing newline
    .reduce((total, line) => {
      let state = {
        char: "",
        multiplicand: "",
        multiplier: "",
      };
      for (let index = 0; index < line.length; index++) {
        switch (true) {
          case "0123456789".includes(line[index]) && state.char === "(":
            state.multiplicand += line[index];
            break;
          case "0123456789".includes(line[index]) && state.char === ",":
            state.multiplier += line[index];
            break;
          case state.char === "(" &&
            line[index] === "," &&
            state.multiplicand !== "":
            state.char = line[index];
            break;
          case line[index] === ")" &&
            state.char === "," &&
            state.multiplier !== "":
            total +=
              parseInt(state.multiplicand, 10) * parseInt(state.multiplier, 10);
            state = { char: "", multiplicand: "", multiplier: "" };
            break;
          case line[index] === "m" && state.char === "":
          case line[index] === "u" && state.char === "m":
          case line[index] === "l" && state.char === "u":
          case line[index] === "(" && state.char === "l":
            state.char = line[index];
            break;
          default:
            state = { char: "", multiplicand: "", multiplier: "" };
            break;
        }
      }
      return total;
    }, 0),
  printTime(Temporal.Now.instant().since(timer))
);

timer = Temporal.Now.instant();

console.log(
  "part two:",
  data
    .split("\n")
    .slice(0, -1) // remove empty trailing newline
    .reduce(
      (total, line) => {
        let state = {
          char: "",
          multiplicand: "",
          multiplier: "",
          on: total.on,
        };
        for (let index = 0; index < line.length; index++) {
          switch (true) {
            case "0123456789".includes(line[index]) && state.char === "mul(":
              state.multiplicand += line[index];
              break;
            case "0123456789".includes(line[index]) && state.char === ",":
              state.multiplier += line[index];
              break;
            case state.char === "mul(" &&
              line[index] === "," &&
              state.multiplicand !== "":
              state.char = line[index];
              break;
            case line[index] === ")" &&
              state.char === "," &&
              state.multiplier !== "":
              if (state.on) {
                total = {
                  ...total,
                  sum: (total.sum +=
                    parseInt(state.multiplicand, 10) *
                    parseInt(state.multiplier, 10)),
                };
              }
              state = {
                ...state,
                char: "",
                multiplicand: "",
                multiplier: "",
              };
              break;
            case line[index] === ")" && state.char === "don't(":
              state = { char: "", multiplicand: "", multiplier: "", on: false };
              break;
            case line[index] === ")" && state.char === "do(":
              state = { char: "", multiplicand: "", multiplier: "", on: true };
              break;
            case line[index] === "m" && state.char === "":
            case line[index] === "u" && state.char === "m":
            case line[index] === "l" && state.char === "mu":
            case line[index] === "(" && state.char === "mul":
            case line[index] === "d" && state.char === "":
            case line[index] === "o" && state.char === "d":
            case line[index] === "n" && state.char === "do":
            case line[index] === "(" && state.char === "do":
            case line[index] === "'" && state.char === "don":
            case line[index] === "t" && state.char === "don'":
            case line[index] === "(" && state.char === "don't":
              state.char += line[index];
              break;
            default:
              state = {
                ...state,
                char: "",
                multiplicand: "",
                multiplier: "",
              };
              break;
          }
        }
        return { ...total, on: state.on };
      },
      { sum: 0, on: true }
    ).sum,
  printTime(Temporal.Now.instant().since(timer))
);