var charts = {};

document.getElementById('uploadBtn').addEventListener('click', function() {
    document.getElementById('excelFile').click();
});

document.getElementById('excelFile').addEventListener('change', function(e) {
    var file = e.target.files[0];
    if (!file) return;
    document.getElementById('statusMsg').textContent = 'Загрузка: ' + file.name + '...';

    var reader = new FileReader();
    reader.onload = function(ev) {
        try {
            var arr = new Uint8Array(ev.target.result);
            var wb = XLSX.read(arr, {type: 'array'});
            var ws = wb.Sheets[wb.SheetNames[0]];
            var rows = XLSX.utils.sheet_to_json(ws, {defval: ''});
            if (!rows.length) { document.getElementById('statusMsg').textContent = 'Файл пуст'; return; }
            build(rows);
        } catch(err) {
            document.getElementById('statusMsg').textContent = 'Ошибка: ' + err.message;
        }
    };
    reader.readAsArrayBuffer(file);
});

function norm(rows) {
    var map = {
        'фио':'name','ф.и.о':'name','сотрудник':'name','employee':'name','имя':'name',
        'дивизион':'div','подразделение':'div','отдел':'div','division':'div','department':'div',
        'курс':'course','обучение':'course','training':'course','программа':'course',
        'тренинг':'course','название тренинга':'course','название курса':'course','название обучения':'course',
        'тема':'course','тема курса':'course','дисциплина':'course','модуль':'course','module':'course',
        'статус':'status','status':'status','состояние':'status',
        'оценка':'score','балл':'score','баллы':'score','рейтинг':'score','ball':'score','score':'score',
        'тренер':'trainer','преподаватель':'trainer','trainer':'trainer','coach':'trainer',
        'дата':'date','date':'date'
    };
    return rows.map(function(r) {
        var out = {};
        for (var k in r) {
            var key = k.toLowerCase().replace(/\s+/g,' ').trim();
            out[map[key] || key] = r[k];
        }
        return out;
    });
}

function done(s) {
    s = (s||'').toLowerCase();
    return s.indexOf('завершен')>=0 || s.indexOf('прошёл')>=0 || s.indexOf('прошел')>=0 ||
           s.indexOf('пройден')>=0 || s==='completed' || s==='ок' || s==='да';
}

function build(raw) {
    var d = norm(raw);

    document.getElementById('uploadSection').classList.add('hidden');
    document.getElementById('dashboard').classList.remove('hidden');

    var allN = {}, scores = [], train = {}, trainers = {};

    d.forEach(function(r) {
        allN[r.name] = true;
        var sc = parseFloat(r.score);
        if (!isNaN(sc) && sc > 0) scores.push(sc);

        var c = r.course || 'Без темы';
        if (!train[c]) train[c] = {all:{}, ok:{}, sc:[], tr:{}};
        train[c].all[r.name] = true;
        if (done(r.status)) train[c].ok[r.name] = true;
        if (!isNaN(sc) && sc > 0) train[c].sc.push(sc);
        if (r.trainer) train[c].tr[r.trainer] = true;

        var tr = r.trainer || '—';
        if (!trainers[tr]) trainers[tr] = {n:0, sc:[], topics:[], trained:{}, divisions:{}};
        trainers[tr].n++;
        if (!isNaN(sc) && sc > 0) trainers[tr].sc.push(sc);
        if (c && c !== 'Без темы') trainers[tr].topics.push(c);
        if (r.name) trainers[tr].trained[r.name] = true;
        var dv = r.division || '—';
        trainers[tr].divisions[dv] = true;
    });

    var totalN = Object.keys(allN).length;
    document.getElementById('statTotal').textContent = totalN;
    document.getElementById('statAvg').textContent = scores.length ? (scores.reduce(function(a,b){return a+b},0)/scores.length).toFixed(1) : '—';

    document.querySelector('#tblTrainings tbody').innerHTML = Object.keys(train).map(function(k){
        var t=train[k], tot=Object.keys(t.all).length, ok=Object.keys(t.ok).length;
        var avg=t.sc.length?(t.sc.reduce(function(a,b){return a+b},0)/t.sc.length).toFixed(1):'—';
        var trn=Object.keys(t.tr).join(', ')||'—';
        return '<tr><td><b>'+k+'</b></td><td>'+ok+'</td><td>'+(tot-ok)+'</td><td>'+(tot?Math.round(ok/tot*100):0)+'%</td><td>'+avg+'</td><td>'+trn+'</td></tr>';
    }).join('');

    document.querySelector('#tblTrainers tbody').innerHTML = Object.keys(trainers).map(function(tr) {
        var t = trainers[tr];
        var topics = (t.topics && t.topics.length > 0) ? Array.from(new Set(t.topics)).join(', ') : '—';
        var avgScore = t.sc && t.sc.length ? (t.sc.reduce(function(a,b){return a+b},0)/t.sc.length).toFixed(1) : '—';
        var trainedCount = t.trained ? Object.keys(t.trained).length : 0;
        var divisions = t.divisions ? Array.from(new Set(Object.keys(t.divisions))).join(', ') : '—';
        return '<tr><td><b>' + tr + '</b></td><td>' + t.n + '</td><td>' + topics + '</td><td>' + trainedCount + '</td><td>' + avgScore + '</td><td>' + divisions + '</td></tr>';
    }).join('');

    cph = {};
    d.forEach(function(r){if(!cph[r.name])cph[r.name]={d:r.division||'',c:{} };if(r.course)cph[r.name].c[r.course]=true});
    var champs=Object.keys(cph).map(function(n){return{name:n,div:cph[n].d,cnt:Object.keys(cph[n].c).length}})
        .sort(function(a,b){return b.cnt-a.cnt}).slice(0,10);
    document.querySelector('#tblChamp tbody').innerHTML = champs.map(function(c){
        return '<tr><td>'+c.name+'</td><td>'+c.div+'</td><td>'+c.cnt+'</td></tr>';
    }).join('');

    var noT = Object.keys(allN);
    document.querySelector('#tblNoTrain tbody').innerHTML = noT.slice(0,20).map(function(n){
        return '<tr><td>'+n+'</td><td>'+(cph[n]?cph[n].d:'')+'</td></tr>';
    }).join('');

    document.querySelector('#tblAll tbody').innerHTML = d.map(function(r){
        return '<tr><td>'+(r.name||'')+'</td><td>'+(r.division||'')+'</td><td>'+(r.course||'')+'</td><td>'+(r.status||'')+'</td><td>'+(r.score||'')+'</td><td>'+(r.trainer||'')+'</td></tr>';
    }).join('');
}