let chartInstances = {};

document.getElementById('excelFile').addEventListener('change', function(e) {
    const file = e.target.files[0];
    if (!file) return;

    const reader = new FileReader();
    reader.onload = function(event) {
        const data = new Uint8Array(event.target.result);
        const workbook = XLSX.read(data, { type: 'array' });
        const firstSheet = workbook.Sheets[workbook.SheetNames[0]];
        const jsonData = XLSX.utils.sheet_to_json(firstSheet, { defval: '' });

        if (jsonData.length === 0) {
            alert('Файл пуст или имеет неверный формат');
            return;
        }

        processAndRender(jsonData);
    };
    reader.readAsArrayBuffer(file);
});

function normalizeHeaders(rows) {
    const headerMap = {
        'фио': 'name', 'ф.и.о': 'name', 'сотрудник': 'name', 'employee': 'name', 'имя': 'name',
        'дивизион': 'division', 'подразделение': 'division', 'отдел': 'division', 'division': 'division', 'department': 'division',
        'курс': 'course', 'обучение': 'course', 'training': 'course', 'программа': 'course',
        'статус': 'status', 'status': 'status', 'состояние': 'status',
        'оценка': 'score', 'ball': 'score', 'score': 'score', 'рейтинг': 'score', 'балл': 'score',
        'тренер': 'trainer', 'trainer': 'coach', 'преподаватель': 'trainer', 'coach': 'trainer',
        'дата': 'date', 'date': 'date', 'дата прохождения': 'date'
    };

    return rows.map(row => {
        const normalized = {};
        for (const key in row) {
            const cleanKey = key.toLowerCase().trim();
            const mapped = headerMap[cleanKey] || cleanKey;
            normalized[mapped] = row[key];
        }
        return normalized;
    });
}

function processAndRender(rawData) {
    const data = normalizeHeaders(rawData);

    document.querySelector('.upload-section').classList.add('hidden');
    document.getElementById('dashboard').classList.remove('hidden');

    const totalEmployees = new Set(data.map(r => r.name)).size;
    const completed = data.filter(r => {
        const s = (r.status || '').toLowerCase();
        return s.includes('завершен') || s.includes('прошёл') || s.includes('прошел') || s === 'completed' || s.includes('ок');
    });
    const completedEmployees = new Set(completed.map(r => r.name)).size;
    const rate = totalEmployees ? Math.round(completedEmployees / totalEmployees * 100) : 0;

    const scores = data.map(r => parseFloat(r.score)).filter(s => !isNaN(s) && s > 0);
    const avgScore = scores.length ? (scores.reduce((a, b) => a + b, 0) / scores.length).toFixed(1) : '—';

    document.getElementById('totalEmployees').textContent = totalEmployees;
    document.getElementById('completedCount').textContent = completedEmployees;
    document.getElementById('completionRate').textContent = rate + '%';
    document.getElementById('avgScore').textContent = avgScore;

    const trainingStats = {};
    data.forEach(r => {
        const course = r.course || 'Без названия';
        if (!trainingStats[course]) trainingStats[course] = { completed: new Set(), all: new Set(), scores: [], trainers: new Set(), divisions: {} };
        trainingStats[course].all.add(r.name);
        const s = (r.status || '').toLowerCase();
        const isCompleted = s.includes('завершен') || s.includes('прошёл') || s.includes('прошел') || s === 'completed' || s.includes('ок');
        if (isCompleted) {
            trainingStats[course].completed.add(r.name);
        }
        const score = parseFloat(r.score);
        if (!isNaN(score) && score > 0) trainingStats[course].scores.push(score);
        if (r.trainer) trainingStats[course].trainers.add(r.trainer);
        const div = r.division || 'Без дивизиона';
        if (!trainingStats[course].divisions[div]) trainingStats[course].divisions[div] = { total: new Set(), completed: new Set() };
        trainingStats[course].divisions[div].total.add(r.name);
        if (isCompleted) trainingStats[course].divisions[div].completed.add(r.name);
    });

    const trainingLabels = Object.keys(trainingStats);
    const trainingCompletedCounts = trainingLabels.map(t => trainingStats[t].completed.size);
    const trainingTotalCounts = trainingLabels.map(t => trainingStats[t].all.size);

    renderChart('trainingChart', 'bar', {
        labels: trainingLabels,
        datasets: [
            {
                label: 'Всего записей',
                data: trainingTotalCounts,
                backgroundColor: 'rgba(33, 150, 243, 0.4)',
                borderColor: '#2196F3',
                borderWidth: 1
            },
            {
                label: 'Прошли',
                data: trainingCompletedCounts,
                backgroundColor: 'rgba(76, 175, 80, 0.7)',
                borderColor: '#4caf50',
                borderWidth: 1
            }
        ]
    }, {
        indexAxis: 'y',
        scales: {
            x: { beginAtZero: true, ticks: { color: '#90a4ae' }, grid: { color: '#1e2d3d' } },
            y: { ticks: { color: '#e0e0e0', font: { size: 11 } }, grid: { color: '#1e2d3d' } }
        }
    });

    const allDivisions = [...new Set(data.map(r => r.division || 'Без дивизиона'))];
    const trainingByDivDatasets = allDivisions.map((div, i) => {
        const colors = ['#2196F3', '#4caf50', '#ff9800', '#9c27b0', '#00bcd4', '#ff5722', '#8bc34a', '#e91e63'];
        return {
            label: div,
            data: trainingLabels.map(t => trainingStats[t].divisions[div] ? trainingStats[t].divisions[div].completed.size : 0),
            backgroundColor: colors[i % colors.length] + 'aa',
            borderColor: colors[i % colors.length],
            borderWidth: 1
        };
    });

    renderChart('trainingByDivisionChart', 'bar', {
        labels: trainingLabels,
        datasets: trainingByDivDatasets
    }, {
        scales: {
            x: { stacked: true, ticks: { color: '#90a4ae', maxRotation: 45 }, grid: { color: '#1e2d3d' } },
            y: { stacked: true, beginAtZero: true, ticks: { color: '#90a4ae' }, grid: { color: '#1e2d3d' } }
        }
    });

    const divisionStats = {};
    data.forEach(r => {
        const div = r.division || 'Без дивизиона';
        if (!divisionStats[div]) divisionStats[div] = { total: new Set(), completed: new Set() };
        divisionStats[div].total.add(r.name);
        const s = (r.status || '').toLowerCase();
        if (s.includes('завершен') || s.includes('прошёл') || s.includes('прошел') || s === 'completed' || s.includes('ок')) {
            divisionStats[div].completed.add(r.name);
        }
    });

    renderChart('divisionChart', 'bar', {
        labels: Object.keys(divisionStats),
        datasets: [
            {
                label: 'Всего',
                data: Object.values(divisionStats).map(d => d.total.size),
                backgroundColor: 'rgba(33, 150, 243, 0.6)',
                borderColor: '#2196F3',
                borderWidth: 1
            },
            {
                label: 'Прошли',
                data: Object.values(divisionStats).map(d => d.completed.size),
                backgroundColor: 'rgba(76, 175, 80, 0.6)',
                borderColor: '#4caf50',
                borderWidth: 1
            }
        ]
    });

    const trainerLoad = {};
    data.forEach(r => {
        const t = r.trainer || 'Не указан';
        if (!trainerLoad[t]) trainerLoad[t] = { count: 0, scores: [] };
        trainerLoad[t].count++;
        const s = parseFloat(r.score);
        if (!isNaN(s) && s > 0) trainerLoad[t].scores.push(s);
    });

    const trainerLabels = Object.keys(trainerLoad);
    const trainerCounts = trainerLabels.map(t => trainerLoad[t].count);
    const trainerAvg = trainerLabels.map(t => {
        const sc = trainerLoad[t].scores;
        return sc.length ? (sc.reduce((a, b) => a + b, 0) / sc.length).toFixed(1) : 0;
    });

    renderChart('trainerChart', 'bar', {
        labels: trainerLabels,
        datasets: [
            {
                label: 'Занятий',
                data: trainerCounts,
                backgroundColor: 'rgba(255, 152, 0, 0.6)',
                borderColor: '#ff9800',
                borderWidth: 1
            },
            {
                label: 'Средняя оценка',
                data: trainerAvg,
                backgroundColor: 'rgba(156, 39, 176, 0.6)',
                borderColor: '#9c27b0',
                borderWidth: 1,
                yAxisID: 'y1'
            }
        ]
    }, {
        scales: {
            y: { beginAtZero: true, ticks: { color: '#90a4ae' }, grid: { color: '#1e2d3d' } },
            y1: { position: 'right', beginAtZero: true, max: 5, ticks: { color: '#90a4ae' }, grid: { display: false } },
            x: { ticks: { color: '#90a4ae' }, grid: { color: '#1e2d3d' } }
        }
    });

    const scoreDist = { '5': 0, '4': 0, '3': 0, '2': 0, '1': 0 };
    scores.forEach(s => {
        const rounded = Math.round(s);
        if (scoreDist[String(rounded)] !== undefined) scoreDist[String(rounded)]++;
    });

    renderChart('scoreChart', 'doughnut', {
        labels: Object.keys(scoreDist).map(k => 'Оценка ' + k),
        datasets: [{
            data: Object.values(scoreDist),
            backgroundColor: ['#4caf50', '#8bc34a', '#ff9800', '#ff5722', '#f44336'],
            borderWidth: 0
        }]
    });

    const statusCounts = {};
    data.forEach(r => {
        const s = (r.status || 'Неизвестно').trim();
        statusCounts[s] = (statusCounts[s] || 0) + 1;
    });

    renderChart('statusChart', 'pie', {
        labels: Object.keys(statusCounts),
        datasets: [{
            data: Object.values(statusCounts),
            backgroundColor: ['#4caf50', '#ff9800', '#f44336', '#2196F3', '#9c27b0', '#00bcd4'],
            borderWidth: 0
        }]
    });

    const trainingAvgScores = trainingLabels.map(t => {
        const sc = trainingStats[t].scores;
        return sc.length ? (sc.reduce((a, b) => a + b, 0) / sc.length).toFixed(1) : 0;
    });

    renderChart('trainingScoreChart', 'bar', {
        labels: trainingLabels,
        datasets: [{
            label: 'Средняя оценка',
            data: trainingAvgScores,
            backgroundColor: trainingAvgScores.map(v => v >= 4 ? 'rgba(76,175,80,0.7)' : v >= 3 ? 'rgba(255,152,0,0.7)' : 'rgba(244,67,54,0.7)'),
            borderColor: trainingAvgScores.map(v => v >= 4 ? '#4caf50' : v >= 3 ? '#ff9800' : '#f44336'),
            borderWidth: 1
        }]
    }, {
        scales: {
            y: { beginAtZero: true, max: 5, ticks: { color: '#90a4ae' }, grid: { color: '#1e2d3d' } },
            x: { ticks: { color: '#e0e0e0', maxRotation: 45 }, grid: { color: '#1e2d3d' } }
        }
    });

    const trainingDetailBody = document.querySelector('#trainingDetailTable tbody');
    trainingDetailBody.innerHTML = trainingLabels.map(t => {
        const st = trainingStats[t];
        const total = st.all.size;
        const done = st.completed.size;
        const pct = total ? Math.round(done / total * 100) : 0;
        const avg = st.scores.length ? (st.scores.reduce((a, b) => a + b, 0) / st.scores.length).toFixed(1) : '—';
        const trainers = [...st.trainers].join(', ') || '—';
        return `<tr>
            <td><strong>${t}</strong></td>
            <td>${done}</td>
            <td>${total - done}</td>
            <td>${pct}%</td>
            <td>${avg}</td>
            <td>${trainers}</td>
        </tr>`;
    }).join('');

    const coursesPerPerson = {};
    data.forEach(r => {
        if (!coursesPerPerson[r.name]) coursesPerPerson[r.name] = { division: r.division || '', courses: new Set() };
        if (r.course) coursesPerPerson[r.name].courses.add(r.course);
    });

    const champions = Object.entries(coursesPerPerson)
        .map(([name, d]) => ({ name, division: d.division, count: d.courses.size }))
        .sort((a, b) => b.count - a.count)
        .slice(0, 10);

    const championsBody = document.querySelector('#championsTable tbody');
    championsBody.innerHTML = champions.map(c =>
        `<tr><td>${c.name}</td><td>${c.division}</td><td>${c.count}</td></tr>`
    ).join('');

    const completedNames = new Set(completed.map(r => r.name));
    const allNames = new Set(data.map(r => r.name));
    const noTraining = [...allNames].filter(n => !completedNames.has(n));
    const noTrainingDivs = {};
    data.forEach(r => {
        if (noTraining.includes(r.name)) noTrainingDivs[r.name] = r.division || '';
    });

    const noTrainingBody = document.querySelector('#noTrainingTable tbody');
    noTrainingBody.innerHTML = noTraining.slice(0, 20).map(n =>
        `<tr><td>${n}</td><td>${noTrainingDivs[n]}</td></tr>`
    ).join('');

    const detailBody = document.querySelector('#detailTable tbody');
    detailBody.innerHTML = data.map(r => {
        const s = (r.status || '').toLowerCase();
        let cls = '';
        if (s.includes('завершен') || s.includes('прошёл') || s.includes('прошел') || s === 'completed' || s.includes('ок')) cls = 'status-completed';
        else if (s.includes('ходе') || s.includes('progress')) cls = 'status-in-progress';
        else cls = '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 renderChart(canvasId, type, chartData, extraOptions) {
    if (chartInstances[canvasId]) chartInstances[canvasId].destroy();

    const defaults = {
        responsive: true,
        maintainAspectRatio: true,
        plugins: {
            legend: { labels: { color: '#e0e0e0', font: { size: 12 } } }
        }
    };

    if (type === 'bar' || type === 'line') {
        defaults.scales = {
            y: { beginAtZero: true, ticks: { color: '#90a4ae' }, grid: { color: '#1e2d3d' } },
            x: { ticks: { color: '#90a4ae' }, grid: { color: '#1e2d3d' } }
        };
    }

    if (extraOptions) {
        Object.assign(defaults, extraOptions);
        if (extraOptions.scales) defaults.scales = extraOptions.scales;
    }

    const ctx = document.getElementById(canvasId).getContext('2d');
    chartInstances[canvasId] = new Chart(ctx, {
        type: type,
        data: chartData,
        options: defaults
    });
}