09. Arena Tier

function arenaTier(input) {
    let gladiators = {};
    while ((line = input.shift()) !== 'Ave Cesar') {
        if (!line.includes(' vs ')) {
            let [gladiator, technique, skill] = line.split(' -> ');
            skill = Number(skill);
            if (!(gladiator in gladiators)) {
                gladiators[gladiator] = { totalSkill: 0 };
                gladiators[gladiator][technique] = skill;
                gladiators[gladiator].totalSkill += skill;
            } else {
                if (!(technique in gladiators[gladiator])) {
                    gladiators[gladiator][technique] = skill;
                    gladiators[gladiator].totalSkill += skill;
                } else {
                    if (gladiators[gladiator][technique] < skill) {
                        gladiators[gladiator].totalSkill += skill - gladiators[gladiator][technique];
                        gladiators[gladiator][technique] = skill;
                    }
                }
            }
        } else {
            let [gladiator1, gladiator2] = line.split(' vs ');
            if ((gladiator1 in gladiators) && (gladiator2 in gladiators)) {
                let techniquesGladiator1 = Object.keys(gladiators[gladiator1]);
                let techniquesGladiator2 = Object.keys(gladiators[gladiator2]);
                for (let techniqueGladiator1 of techniquesGladiator1) {
                    if (techniquesGladiator2.includes(techniqueGladiator1) && techniqueGladiator1 !== 'totalSkill') {
                        if (gladiators[gladiator1].totalSkill > gladiators[gladiator2].totalSkill) {
                            delete gladiators[gladiator2];
                        } else {
                            delete gladiators[gladiator1];
                        }
                        break;
                    }
                }
            }
        }
    }
    Object.entries(gladiators)
        .sort((a, b) => a[0].localeCompare(b[0]))
        .sort((a, b) => b[1].totalSkill - a[1].totalSkill)
        .forEach(gladiator => {
            console.log(`${gladiator[0]}: ${gladiator[1].totalSkill} skill`);
            delete gladiator[1].totalSkill;
            Object.entries(gladiator[1])
                .sort((a, b) => a[0].localeCompare(b[0]))
                .sort((a, b) => b[1] - a[1])
                .forEach(a => console.log(`- ${a[0]} <!> ${a[1]}`));
        });
}