Teams selection

function areSameClub(team1, team2) {
    return team1.club === team2.club;
}

function hasThreeTeamsFromSameProvince(group, province) {
    const provinceCount = group.filter(team => team.province === province).length;
    return provinceCount >= 3;
}

function isGroupFull(group) {
    return group.length >= 4;
}

function distributeTeams(seedTeams, otherTeams) {
    const groups = {
        A: [],
        B: [],
        C: [],
        D: []
    };

    // Assign seed teams to groups
    seedTeams.forEach((seedTeam, index) => {
        const group = Object.keys(groups)[index];
        groups[group].push(seedTeam);
    });

    // Shuffle otherTeams
    otherTeams.sort(() => Math.random() - 0.5);

    while (otherTeams.length > 0) {
        const currentTeam = otherTeams.pop();

        for (const group in groups) {
            const province = currentTeam.province;

            if (
                groups[group].every(team => !areSameClub(currentTeam, team)) &&
                !hasThreeTeamsFromSameProvince(groups[group], province) &&
                !isGroupFull(groups[group])
            ) {
                groups[group].push(currentTeam);
                break;
            }
        }
    }

    return groups;
}

// Example

const seedTeams = [
  { name: 'Stechco1', club: 'Stechco' },
  { name: 'VietUnitedFC', club: 'VietUnitedFC' },
  { name: 'CICC', club: 'CICC' },
  { name: 'CalgaryVFC', club: 'CalgaryVFC' }
]

const otherTeams = [
  { name: 'CTC', province: 'Ontario', club: 'CTC' },
  { name: 'FCKingston', province: 'Ontario', club: 'FCKingston' },
  { name: 'KWFC', province: 'Ontario', club: 'KWFC' },
  { name: 'BFC', province: 'Ontario', club: 'BFC' },
  { name: 'YGOfVN', province: 'Ontario', club: 'YGOfVN' },
  { name: 'FCAE', province: 'Ontario', club: 'FCAE' },
  { name: 'LankFC', province: 'Ontario', club: 'LankFC' },
  { name: 'SFC', province: 'Quebec', club: 'SFC' },
  { name: 'VMU', province: 'Quebec', club: 'VMU' },
  { name: 'Stechco2', province: 'Quebec', club: 'Stechco' },
  { name: 'FC3Mien', province: 'Quebec', club: 'FC3Mien' },
  { name: 'RBJunior', province: 'Quebec', club: 'RBJunior' }
]
    
const result = distributeTeams(seedTeams, otherTeams);
console.log(result);