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 = {}, doneN = {}, scores = [], train = {}, divs = {}, trainers = {};

    d.forEach(function(r) {
        allN[r.name] = true;
        if (done(r.status)) doneN[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:{}, div:{}};
        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 dv = r.division || '—';
        if (!train[c].div[dv]) train[c].div[dv] = {all:{}, ok:{}};
        train[c].div[dv].all[r.name] = true;
        if (done(r.status)) train[c].div[dv].ok[r.name] = true;

        if (!divs[dv]) divs[dv] = {all:{}, ok:{}};
        divs[dv].all[r.name] = true;
        if (done(r.status)) divs[dv].ok[r.name] = true;

        var tr = r.trainer || '—';
        if (!trainers[tr]) trainers[tr] = {n:0, sc:[]};
        trainers[tr].n++;
        if (!isNaN(sc) && sc > 0) trainers[tr].sc.push(sc);
    });

    var totalN = Object.keys(allN).length;
    var doneNn = Object.keys(doneN).length;
    document.getElementById('statTotal').textContent = totalN;
    document.getElementById('statDone').textContent = doneNn;
    document.getElementById('statRate').textContent = totalN ? Math.round(doneNn/totalN*100)+'%' : '0%';
    document.getElementById('statAvg').textContent = scores.length ? (scores.reduce(function(a,b){return a+b},0)/scores.length).toFixed(1) : '—';

    var tKeys = Object.keys(train);
    var tDone = tKeys.map(function(k){return Object.keys(train[k].ok).length});
    var tAll = tKeys.map(function(k){return Object.keys(train[k].all).length});

    barH('chartTrainings', tKeys, [
        {label:'Всего', data:tAll, bg:'rgba(33,150,243,0.4)', bc:'#2196F3'},
        {label:'Прошли', data:tDone, bg:'rgba(76,175,80,0.7)', bc:'#4caf50'}
    ]);

    var dvNames = Object.keys(divs);
    var dvColors = ['#2196F3','#4caf50','#ff9800','#9c27b0','#00bcd4','#ff5722','#8bc34a','#e91e63'];
    var divDatasets = dvNames.map(function(dv,i){
        return {label:dv, data:tKeys.map(function(tk){return train[tk].div[dv]?Object.keys(train[tk].div[dv].ok).length:0}),
            bg:dvColors[i%dvColors.length]+'cc', bc:dvColors[i%dvColors.length]};
    });
    stacked('chartTrainDiv', tKeys, divDatasets);

    bar('chartDiv', dvNames, [
        {label:'Всего', data:dvNames.map(function(d){return Object.keys(divs[d].all).length}), bg:'rgba(33,150,243,0.6)', bc:'#2196F3'},
        {label:'Прошли', data:dvNames.map(function(d){return Object.keys(divs[d].ok).length}), bg:'rgba(76,175,80,0.6)', bc:'#4caf50'}
    ]);

    var trNames = Object.keys(trainers);
    bar('chartTrainers', trNames, [
        {label:'Занятий', data:trNames.map(function(t){return trainers[t].n}), bg:'rgba(255,152,0,0.6)', bc:'#ff9800'}
    ]);

    var sd = {5:0,4:0,3:0,2:0,1:0};
    scores.forEach(function(s){var r=Math.round(s);if(sd[r]!==undefined)sd[r]++});
    doughnut('chartScores', Object.keys(sd).map(function(k){return 'Оценка '+k}), Object.values(sd),
        ['#4caf50','#8bc34a','#ff9800','#ff5722','#f44336']);

    var tAvg = tKeys.map(function(k){var sc=train[k].sc;return sc.length?(sc.reduce(function(a,b){return a+b},0)/sc.length).toFixed(1):0});
    bar('chartTrainScores', tKeys, [{label:'Средняя оценка', data:tAvg,
        bg:tAvg.map(function(v){return v>=4?'rgba(76,175,80,0.7)':v>=3?'rgba(255,152,0,0.7)':'rgba(244,67,54,0.7)'}),
        bc:tAvg.map(function(v){return v>=4?'#4caf50':v>=3?'#ff9800':'#f44336'})}]);

    document.querySelector('#tblTrainings tbody').innerHTML = tKeys.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('');

    var 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).filter(function(n){return !doneN[n]});
    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){
        var cls=done(r.status)?'status-completed':'status-not-started';
        return '<tr><td>'+(r.name||'')+'</td><td>'+(r.division||'')+'</td><td>'+(r.course||'')+'</td><td class="'+cls+'">'+(r.status||'')+'</td><td>'+(r.score||'')+'</td><td>'+(r.trainer||'')+'</td></tr>';
    }).join('');
}

function barH(id, labels, ds) {
    if(charts[id])charts[id].destroy();
    charts[id]=new Chart(document.getElementById(id),{type:'bar',data:{labels:labels,datasets:ds.map(function(s){return{label:s.label,data:s.data,backgroundColor:s.bg,borderColor:s.bc,borderWidth:1}})},
        options:{indexAxis:'y',responsive:true,plugins:{legend:{labels:{color:'#e0e0e0'}}},scales:{x:{beginAtZero:true,ticks:{color:'#90a4ae'},grid:{color:'#1e2d3d'}},y:{ticks:{color:'#e0e0e0',font:{size:11}},grid:{color:'#1e2d3d'}}}}});
}
function bar(id, labels, ds) {
    if(charts[id])charts[id].destroy();
    charts[id]=new Chart(document.getElementById(id),{type:'bar',data:{labels:labels,datasets:ds.map(function(s){return{label:s.label,data:s.data,backgroundColor:s.bg,borderColor:s.bc,borderWidth:1}})},
        options:{responsive:true,plugins:{legend:{labels:{color:'#e0e0e0'}}},scales:{y:{beginAtZero:true,ticks:{color:'#90a4ae'},grid:{color:'#1e2d3d'}},x:{ticks:{color:'#90a4ae'},grid:{color:'#1e2d3d'}}}}});
}
function stacked(id, labels, ds) {
    if(charts[id])charts[id].destroy();
    charts[id]=new Chart(document.getElementById(id),{type:'bar',data:{labels:labels,datasets:ds.map(function(s){return{label:s.label,data:s.data,backgroundColor:s.bg,borderColor:s.bc,borderWidth:1}})},
        options:{responsive:true,plugins:{legend:{labels:{color:'#e0e0e0'}}},scales:{x:{stacked:true,ticks:{color:'#90a4ae',maxRotation:45},grid:{color:'#1e2d3d'}},y:{stacked:true,beginAtZero:true,ticks:{color:'#90a4ae'},grid:{color:'#1e2d3d'}}}}});
}
function doughnut(id, labels, data, colors) {
    if(charts[id])charts[id].destroy();
    charts[id]=new Chart(document.getElementById(id),{type:'doughnut',data:{labels:labels,datasets:[{data:data,backgroundColor:colors,borderWidth:0}]},
        options:{responsive:true,plugins:{legend:{labels:{color:'#e0e0e0'}}}}});
}