scheduling

schedule.json

{
  "1": [
    [1, 2],
    [1, 3],
    [1, 9],
    [1, 6],
    [1, 3],
    [1, 9],
    [1, 6],
    [1, 5],
    [1, 12],
    [1, 10],
    [1, 4],
    [1, 7],
    [1, 8]
  ],
  "2": [
    [2, 1],
    [2, 4],
    [2, 8],
    [2, 12],
    [2, 4],
    [2, 8],
    [2, 12],
    [2, 3],
    [2, 9],
    [2, 10],
    [2, 6],
    [2, 5],
    [2, 11]
  ],
  "3": [
    [3, 4],
    [3, 1],
    [3, 9],
    [3, 6],
    [3, 1],
    [3, 9],
    [3, 6],
    [3, 2],
    [3, 7],
    [3, 8],
    [3, 11],
    [3, 10],
    [3, 12]
  ],
  "4": [
    [4, 3],
    [4, 2],
    [4, 8],
    [4, 12],
    [4, 2],
    [4, 8],
    [4, 12],
    [4, 1],
    [4, 5],
    [4, 10],
    [4, 7],
    [4, 9],
    [4, 11]
  ],
  "5": [
    [5, 6],
    [5, 7],
    [5, 10],
    [5, 11],
    [5, 7],
    [5, 10],
    [5, 11],
    [5, 1],
    [5, 2],
    [5, 4],
    [5, 8],
    [5, 9],
    [5, 12]
  ],
  "6": [
    [6, 5],
    [6, 1],
    [6, 3],
    [6, 9],
    [6, 1],
    [6, 3],
    [6, 9],
    [6, 2],
    [6, 11],
    [6, 7],
    [6, 12],
    [6, 10],
    [6, 8]
  ],
  "7": [
    [7, 8],
    [7, 5],
    [7, 10],
    [7, 11],
    [7, 5],
    [7, 10],
    [7, 11],
    [7, 1],
    [7, 3],
    [7, 4],
    [7, 6],
    [7, 9],
    [7, 12]
  ],
  "8": [
    [8, 7],
    [8, 2],
    [8, 4],
    [8, 12],
    [8, 2],
    [8, 4],
    [8, 12],
    [8, 1],
    [8, 3],
    [8, 5],
    [8, 6],
    [8, 11],
    [8, 10]
  ],
  "9": [
    [9, 10],
    [9, 1],
    [9, 3],
    [9, 6],
    [9, 1],
    [9, 3],
    [9, 6],
    [9, 2],
    [9, 4],
    [9, 5],
    [9, 7],
    [9, 11],
    [9, 12]
  ],
  "10": [
    [10, 9],
    [10, 5],
    [10, 7],
    [10, 11],
    [10, 5],
    [10, 7],
    [10, 11],
    [10, 1],
    [10, 2],
    [10, 3],
    [10, 4],
    [10, 6],
    [10, 8]
  ],
  "11": [
    [11, 12],
    [11, 5],
    [11, 7],
    [11, 10],
    [11, 5],
    [11, 7],
    [11, 10],
    [11, 2],
    [11, 3],
    [11, 4],
    [11, 6],
    [11, 8],
    [11, 9]
  ],
  "12": [
    [12, 11],
    [12, 2],
    [12, 4],
    [12, 8],
    [12, 2],
    [12, 4],
    [12, 8],
    [12, 1],
    [12, 3],
    [12, 5],
    [12, 6],
    [12, 7],
    [12, 9]
  ]
}

shittyschedulingscript.js

const rivals = [
  [1, 2],
  [2, 1],
  [3, 4],
  [4, 3],
  [5, 6],
  [6, 5],
  [7, 8],
  [8, 7],
  [9, 10],
  [10, 9],
  [11, 12],
  [12, 11]
];
const divisions = [[1, 3, 9, 6], [2, 4, 8, 12], [5, 7, 10, 11]];

const schedules = {};
const teamsPlayed = {};

for (let i = 0; i < 12; i++) {
  schedules[i + 1] = [rivals[i]];
  teamsPlayed[i + 1] = [rivals[i].find(rival => rival !== i + 1)];
}

for (let i = 0; i < divisions.length; i++) {
  const division = divisions[i];
  for (let j = 0; j < division.length; j++) {
    const currTeam = division[j];
    const divisionWithoutTeam = division.filter(team => team !== currTeam);
    schedules[currTeam].push(
      ...divisionWithoutTeam.map(team => [currTeam, team])
    );
    schedules[currTeam].push(
      ...divisionWithoutTeam.map(team => [currTeam, team])
    );
    teamsPlayed[currTeam].push(...divisionWithoutTeam);
  }
}

for (let i = 0; i < 12; i++) {
  const currTeam = i + 1;
  const divisionIndex = divisions.findIndex(div => div.includes(currTeam));
  let nonDivisionTeams = divisions
  .filter((_, index) => divisionIndex !== index)
  .reduce((flattened, division) => flattened.concat(division), [])
  .filter(team => {
    return !teamsPlayed[currTeam].includes(team) && schedules[team].length !== 13
  });
  const gamesPlayed = schedules[currTeam].length;
  for (let j = 0; j < 13 - gamesPlayed; j++) {
    const randomNonDivisionTeam = nonDivisionTeams[Math.floor(Math.random() * nonDivisionTeams.length)];
    schedules[currTeam].push([currTeam, randomNonDivisionTeam]);
    schedules[randomNonDivisionTeam].push([randomNonDivisionTeam, currTeam]);
    teamsPlayed[currTeam].push(randomNonDivisionTeam);
    teamsPlayed[randomNonDivisionTeam].push(currTeam);
    nonDivisionTeams = nonDivisionTeams.filter(team => team !== randomNonDivisionTeam);
  }
}

console.log(schedules);