Concert (Final Exam 240719)

function solve(input) {
  let startBand;
  let totaltime = 0;
  let bands = {};

  for (const line of input) {
    if (line === "start of concert") {
      startBand = input[input.length - 1];
      break;
    }
    let [command, band, token] = line.split("; ");
    switch (command) {
      case "Add":
        let arr = token.split(", ");
        if (!bands.hasOwnProperty(band)) {
          let members = new Set();
          bands[band] = {
            members: members,
            time: 0
          };
        }
        arr.forEach(member => bands[band].members.add(member));
        break;

      case "Play":
        let time = Number(token);
        if (!bands.hasOwnProperty(band)) {
          let groupers = new Set();
          bands[band] = {
            members: groupers,
            time: 0
          };
        }
        bands[band].time += time;
        totaltime += time;
        break;
    }
  }

  console.log(`Total time: ${totaltime}`);
  Object.entries(bands)
    .sort((a, b) => {
      if (b[1].time === a[1].time) {
        return a[0].localeCompare(b[0]);
      }
      return b[1].time - a[1].time;
    })
    .forEach(pair => {
      console.log(`${pair[0]} -> ${pair[1].time}`);
    });

  console.log(startBand);
  Array.from(bands[startBand].members).forEach(member =>
    console.log(`=> ${member}`)
  );
}