{{template "base" .}}

{{define "head"}}
<style>
    .stat-card {
        transition: transform 0.2s ease-in-out;
    }

    .stat-card:hover {
        transform: translateY(-5px);
    }

    .progress {
        height: 25px;
    }

    .progress-bar {
        font-size: 0.9rem;
        font-weight: 500;
    }

    .subject-row:hover {
        background-color: rgba(0, 0, 0, 0.02);
    }

    .table-progress {
        height: 20px;
    }

    .pagination-info {
        font-size: 0.875rem;
    }

    .stats-table {
        min-width: 700px;
    }

    .stats-table th,
    .stats-table td {
        white-space: nowrap;
    }

    .stats-table th:first-child,
    .stats-table td:first-child {
        min-width: 120px;
    }

    #shareCard {
        width: 600px;
        height: 315px;
        position: fixed;
        left: -9999px;
        top: 0;
        background: linear-gradient(135deg, #005bea 0%, #00c6fb 100%);
        padding: 2rem;
        color: white;
        border-radius: 12px;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        font-family: 'Inter', system-ui, -apple-system, sans-serif;
    }

    #shareCard .card-title {
        font-size: 1.5rem;
        font-weight: bold;
        opacity: 0.9;
    }

    #shareCard .rate-display {
        font-size: 5rem;
        font-weight: bold;
        line-height: 1;
        margin: 1rem 0;
    }

    #shareCard .stats-row {
        display: flex;
        justify-content: space-around;
        background: rgba(255, 255, 255, 0.1);
        border-radius: 8px;
        padding: 1rem;
        backdrop-filter: blur(5px);
    }

    #shareCard .stat-item {
        text-align: center;
    }

    #shareCard .stat-label {
        font-size: 0.8rem;
        opacity: 0.8;
        display: block;
        margin-bottom: 0.2rem;
    }

    #shareCard .stat-value {
        font-size: 1.4rem;
        font-weight: bold;
    }
</style>
<script src="https://cdn.jsdelivr.net/npm/html2canvas@1.4.1/dist/html2canvas.min.js"></script>
{{end}}

{{define "content"}}
<div class="d-flex justify-content-between align-items-center mb-4">
    <h1><i class="bi bi-bar-chart me-2"></i>統計</h1>
    <a href="/assignments" class="btn btn-outline-secondary">
        <i class="bi bi-arrow-left me-1"></i>課題一覧に戻る
    </a>
</div>

<div class="card mb-4">
    <div class="card-body">
        <form method="GET" action="/statistics" class="row g-3">
            <div class="col-md-4">
                <label class="form-label">科目</label>
                <select name="subject" class="form-select">
                    <option value="">すべての科目</option>
                    {{range .subjects}}
                    <option value="{{.}}" {{if eq . $.selectedSubject}}selected{{end}}>{{.}}{{if index
                        $.archivedSubjects .}} (アーカイブ済){{end}}</option>
                    {{end}}
                </select>
            </div>
            <div class="col-md-2">
                <label class="form-label">登録日（開始）</label>
                <input type="date" name="from" class="form-control" value="{{.fromDate}}">
            </div>
            <div class="col-md-2">
                <label class="form-label">登録日（終了）</label>
                <input type="date" name="to" class="form-control" value="{{.toDate}}">
            </div>
            <div class="col-md-4 d-flex align-items-end">
                <button type="submit" class="btn btn-primary me-2">
                    <i class="bi bi-filter me-1"></i>絞り込み
                </button>
                <a href="/statistics" class="btn btn-outline-secondary">
                    <i class="bi bi-x-lg me-1"></i>リセット
                </a>
            </div>
        </form>
    </div>
</div>

<div class="row g-4 mb-4">
    <div class="col-6 col-lg-3">
        <div class="card stat-card bg-primary text-white h-100">
            <div class="card-body">
                <div class="d-flex justify-content-between align-items-center">
                    <div>
                        <h6 class="text-white-50 mb-1">総課題数</h6>
                        <h2 class="mb-0">{{.stats.TotalAssignments}}</h2>
                    </div>
                    <i class="bi bi-list-task display-4 opacity-50"></i>
                </div>
            </div>
        </div>
    </div>
    <div class="col-6 col-lg-3">
        <div class="card stat-card bg-success text-white h-100">
            <div class="card-body">
                <div class="d-flex justify-content-between align-items-center">
                    <div>
                        <h6 class="text-white-50 mb-1">完了</h6>
                        <h2 class="mb-0">{{.stats.CompletedAssignments}}</h2>
                    </div>
                    <i class="bi bi-check-circle display-4 opacity-50"></i>
                </div>
            </div>
        </div>
    </div>
    <div class="col-6 col-lg-3">
        <div class="card stat-card bg-warning text-dark h-100">
            <div class="card-body">
                <div class="d-flex justify-content-between align-items-center">
                    <div>
                        <h6 class="text-dark-50 mb-1">未完了</h6>
                        <h2 class="mb-0">{{.stats.PendingAssignments}}</h2>
                    </div>
                    <i class="bi bi-hourglass-split display-4 opacity-50"></i>
                </div>
            </div>
        </div>
    </div>
    <div class="col-6 col-lg-3">
        <div class="card stat-card bg-danger text-white h-100">
            <div class="card-body">
                <div class="d-flex justify-content-between align-items-center">
                    <div>
                        <h6 class="text-white-50 mb-1">期限切れ</h6>
                        <h2 class="mb-0">{{.stats.OverdueAssignments}}</h2>
                    </div>
                    <i class="bi bi-exclamation-triangle display-4 opacity-50"></i>
                </div>
            </div>
        </div>
    </div>
</div>

<div class="card mb-4">
    <div class="card-header d-flex justify-content-between align-items-center">
        <span><i class="bi bi-clock-history me-2"></i>期限内完了率</span>
        <button class="btn btn-sm btn-outline-primary" onclick="generateShareImage()">
            <i class="bi bi-share me-1"></i>シェア
        </button>
    </div>
    <div class="card-body">
        <div class="row align-items-center">
            <div class="col-md-3 text-center mb-3 mb-md-0">
                <h1
                    class="display-3 mb-0 {{if ge .stats.OnTimeCompletionRate 80.0}}text-success{{else if ge .stats.OnTimeCompletionRate 50.0}}text-warning{{else}}text-danger{{end}}">
                    {{printf "%.1f" .stats.OnTimeCompletionRate}}%
                </h1>
                <small class="text-muted">期限内完了率</small>
            </div>
            <div class="col-md-9">
                <div class="progress">
                    {{if ge .stats.OnTimeCompletionRate 80.0}}
                    <div class="progress-bar bg-success" role="progressbar"
                        style="width: {{.stats.OnTimeCompletionRate}}%">
                        {{printf "%.1f" .stats.OnTimeCompletionRate}}% 期限内に完了
                    </div>
                    {{else if ge .stats.OnTimeCompletionRate 50.0}}
                    <div class="progress-bar bg-warning" role="progressbar"
                        style="width: {{.stats.OnTimeCompletionRate}}%">
                        {{printf "%.1f" .stats.OnTimeCompletionRate}}% 期限内に完了
                    </div>
                    {{else}}
                    <div class="progress-bar bg-danger" role="progressbar"
                        style="width: {{.stats.OnTimeCompletionRate}}%">
                        {{printf "%.1f" .stats.OnTimeCompletionRate}}% 期限内に完了
                    </div>
                    {{end}}
                </div>
                <small class="text-muted mt-2 d-block">完了した課題のうち、期限内に完了した割合を表示しています。</small>
            </div>
        </div>
    </div>
</div>

<div class="card mb-4" id="activeSubjectsCard">
    <div class="card-header d-flex justify-content-between align-items-center">
        <span><i class="bi bi-collection me-2"></i>アクティブ科目</span>
        <span class="badge bg-primary" id="activeCount">0</span>
    </div>
    <div class="card-body p-0">
        <div class="table-responsive">
            <table class="table table-hover mb-0 stats-table">
                <thead class="table-light">
                    <tr>
                        <th>科目</th>
                        <th class="text-center">総数</th>
                        <th class="text-center">完了</th>
                        <th class="text-center">未完了</th>
                        <th class="text-center">期限切れ</th>
                        <th class="text-center">完了率</th>
                        <th style="width: 150px;">進捗</th>
                        <th class="text-center">操作</th>
                    </tr>
                </thead>
                <tbody id="activeSubjectsBody"></tbody>
            </table>
        </div>
    </div>
    <div class="card-footer d-flex justify-content-between align-items-center">
        <span class="pagination-info" id="activePageInfo"></span>
        <nav>
            <ul class="pagination pagination-sm mb-0" id="activePagination"></ul>
        </nav>
    </div>
</div>

<div class="card" id="archivedSubjectsCard">
    <div class="card-header d-flex justify-content-between align-items-center">
        <span><i class="bi bi-archive me-2"></i>アーカイブ済み科目</span>
        <span class="badge bg-secondary" id="archivedCount">0</span>
    </div>
    <div class="card-body p-0">
        <div class="table-responsive">
            <table class="table table-hover mb-0 stats-table">
                <thead class="table-light">
                    <tr>
                        <th>科目</th>
                        <th class="text-center">総数</th>
                        <th class="text-center">完了</th>
                        <th class="text-center">未完了</th>
                        <th class="text-center">期限切れ</th>
                        <th class="text-center">完了率</th>
                        <th style="width: 150px;">進捗</th>
                        <th class="text-center">操作</th>
                    </tr>
                </thead>
                <tbody id="archivedSubjectsBody"></tbody>
            </table>
        </div>
    </div>
    <div class="card-footer d-flex justify-content-between align-items-center">
        <span class="pagination-info" id="archivedPageInfo"></span>
        <nav>
            <ul class="pagination pagination-sm mb-0" id="archivedPagination"></ul>
        </nav>
    </div>
</div>

<div class="card d-none" id="noSubjectsCard">
    <div class="card-body text-center py-5">
        <i class="bi bi-inbox display-1 text-muted"></i>
        <h4 class="mt-3">科目別の統計データがありません</h4>
        <p class="text-muted">課題を登録して科目を設定すると、ここに統計が表示されます。</p>
    </div>
</div>

<div id="shareCard">
    <div>
        <div class="d-flex align-items-center mb-4">
            <i class="bi bi-journal-check me-2" style="font-size: 1.5rem;"></i>
            <span class="card-title">Super Homework Manager</span>
        </div>
    </div>

    <div class="text-center">
        <div style="font-size: 1.5rem; font-weight: bold; margin-bottom: 0.5rem; opacity: 0.9;">期限内完了率</div>
        <div class="rate-display" style="margin-top: 0;">
            {{printf "%.1f" .stats.OnTimeCompletionRate}}<span style="font-size: 2.5rem;">%</span>
        </div>
    </div>

    <div class="stats-row">
        <div class="stat-item">
            <span class="stat-label">完了</span>
            <span class="stat-value">{{.stats.CompletedAssignments}}</span>
        </div>
        <div class="stat-item">
            <span class="stat-label">未完了</span>
            <span class="stat-value">{{.stats.PendingAssignments}}</span>
        </div>
        <div class="stat-item">
            <span class="stat-label">期限切れ</span>
            <span class="stat-value">{{.stats.OverdueAssignments}}</span>
        </div>
    </div>
</div>

<!-- Share Modal -->
<div class="modal fade" id="shareModal" tabindex="-1">
    <div class="modal-dialog modal-dialog-centered">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title"><i class="bi bi-share me-2"></i>シェア</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <div class="modal-body text-center">
                <div id="sharePreviewContainer" class="mb-3" style="max-width: 100%; overflow: hidden;">
                </div>
                <p class="text-muted small mb-3">
                    画像を保存またはコピーして、SNSに貼り付けてください。<br>
                    <span class="text-danger"><i class="bi bi-info-circle me-1"></i>ブラウザの制限により、自動で画像は添付されません。</span>
                </p>
                <div class="d-grid gap-2">
                    <button class="btn btn-outline-primary" onclick="copyImageToClipboard(this)">
                        <i class="bi bi-clipboard me-2"></i>画像をコピー
                    </button>
                    <a id="downloadLink" class="btn btn-outline-secondary" download="stats.png">
                        <i class="bi bi-download me-2"></i>画像を保存
                    </a>
                    <a id="twitterShareBtn" href="#" target="_blank" class="btn btn-dark"
                        style="background-color: #000;">
                        <i class="bi bi-twitter-x me-2"></i>Xでポストする
                    </a>
                </div>
            </div>
        </div>
    </div>
</div>
{{end}}

{{define "scripts"}}
<script id="subjectsData" type="application/json">
{"csrfToken":"{{.csrfToken}}","subjects":[{{range $i, $s := .stats.Subjects}}{{if $i}},{{end}}{"subject":"{{$s.Subject}}","total":{{$s.Total}},"completed":{{$s.Completed}},"pending":{{$s.Pending}},"overdue":{{$s.Overdue}},"rate":{{$s.OnTimeCompletionRate}},"isArchived":{{if index $.archivedSubjects $s.Subject}}true{{else}}false{{end}}}{{end}}]}
</script>
<script>
    (function () {
        var data = JSON.parse(document.getElementById('subjectsData').textContent);
        var csrfToken = data.csrfToken;
        var subjects = data.subjects;
        var PAGE_SIZE = 10;
        var activeSubjects = subjects.filter(function (s) { return !s.isArchived; });
        var archivedSubjects = subjects.filter(function (s) { return s.isArchived; });
        var activePage = 1;
        var archivedPage = 1;

        // Share Functionality
        window.generateShareImage = function () {
            var card = document.getElementById('shareCard');
            // Ensure card is visible for rendering but off-screen
            card.style.display = 'flex';

            html2canvas(card, {
                backgroundColor: null,
                scale: 2 // High resolution
            }).then(canvas => {
                var imgData = canvas.toDataURL('image/png');

                // Set up preview
                var previewContainer = document.getElementById('sharePreviewContainer');
                previewContainer.innerHTML = '';
                var img = document.createElement('img');
                img.src = imgData;
                img.style.maxWidth = '100%';
                img.style.borderRadius = '8px';
                img.style.boxShadow = '0 4px 12px rgba(0,0,0,0.1)';
                previewContainer.appendChild(img);

                // Set up download link
                var downloadLink = document.getElementById('downloadLink');
                downloadLink.href = imgData;

                // Set up Twitter button
                var text = '私の課題完了状況\n期限内完了率: {{printf "%.1f" .stats.OnTimeCompletionRate}}%\n#SuperHomeworkManager';
                var twitterBtn = document.getElementById('twitterShareBtn');
                twitterBtn.href = "https://twitter.com/intent/tweet?text=" + encodeURIComponent(text);

                // Show modal
                var modal = new bootstrap.Modal(document.getElementById('shareModal'));
                modal.show();
            });
        };

        // Helper to convert Data URL to Blob
        function dataURLtoBlob(dataurl) {
            var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
                bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
            while (n--) {
                u8arr[n] = bstr.charCodeAt(n);
            }
            return new Blob([u8arr], { type: mime });
        }

        window.copyImageToClipboard = function (btn) {
            var canvas = document.querySelector('#sharePreviewContainer img');
            if (!canvas) return;

            if (!navigator.clipboard) {
                alert('このブラウザまたは環境（非HTTPS/非localhost）では、クリップボードへのコピー機能がサポートされていません。\n「画像を保存」を使用してください。');
                return;
            }

            try {
                var blob = dataURLtoBlob(canvas.src);
                navigator.clipboard.write([
                    new ClipboardItem({
                        'image/png': blob
                    })
                ]).then(function () {
                    var originalText = btn.innerHTML;
                    btn.innerHTML = '<i class="bi bi-check me-2"></i>コピーしました';
                    btn.classList.remove('btn-outline-primary');
                    btn.classList.add('btn-success');
                    setTimeout(function () {
                        btn.innerHTML = originalText;
                        btn.classList.add('btn-outline-primary');
                        btn.classList.remove('btn-success');
                    }, 2000);
                }).catch(function (err) {
                    console.error('Failed to copy: ', err);
                    alert('画像のコピーに失敗しました。\nエラー: ' + err.message + '\n「画像を保存」を使用してください。');
                });
            } catch (err) {
                console.error('Failed to create blob: ', err);
                alert('画像データの生成に失敗しました: ' + err.message);
            }
        };

        function getRateClass(rate) {
            if (rate >= 80) return 'text-success';
            if (rate >= 50) return 'text-warning';
            return 'text-danger';
        }

        function renderProgress(completed, pending, overdue, total) {
            if (total === 0) return '<div class="progress table-progress"></div>';
            var cP = (completed / total * 100).toFixed(1);
            var pP = (pending / total * 100).toFixed(1);
            var oP = (overdue / total * 100).toFixed(1);
            return '<div class="progress table-progress">' +
                '<div class="progress-bar bg-success" style="width:' + cP + '%" title="完了: ' + completed + '"></div>' +
                '<div class="progress-bar bg-warning" style="width:' + pP + '%" title="未完了: ' + pending + '"></div>' +
                '<div class="progress-bar bg-danger" style="width:' + oP + '%" title="期限切れ: ' + overdue + '"></div></div>';
        }

        function renderRow(s, isArchived) {
            var action = isArchived ?
                '<form action="/statistics/unarchive-subject" method="POST" class="d-inline"><input type="hidden" name="_csrf" value="' + csrfToken + '"><input type="hidden" name="subject" value="' + s.subject + '"><button type="submit" class="btn btn-sm btn-outline-success" title="復元"><i class="bi bi-arrow-counterclockwise"></i></button></form>' :
                '<form action="/statistics/archive-subject" method="POST" class="d-inline"><input type="hidden" name="_csrf" value="' + csrfToken + '"><input type="hidden" name="subject" value="' + s.subject + '"><button type="submit" class="btn btn-sm btn-outline-secondary" title="アーカイブ"><i class="bi bi-archive"></i></button></form>';
            return '<tr class="subject-row">' +
                '<td><a href="/statistics?subject=' + encodeURIComponent(s.subject) + '" class="text-decoration-none"><i class="bi bi-folder me-1"></i>' + s.subject + '</a></td>' +
                '<td class="text-center">' + s.total + '</td>' +
                '<td class="text-center text-success">' + s.completed + '</td>' +
                '<td class="text-center text-warning">' + s.pending + '</td>' +
                '<td class="text-center text-danger">' + s.overdue + '</td>' +
                '<td class="text-center"><span class="' + getRateClass(s.rate) + '">' + s.rate.toFixed(1) + '%</span></td>' +
                '<td>' + renderProgress(s.completed, s.pending, s.overdue, s.total) + '</td>' +
                '<td class="text-center">' + action + '</td></tr>';
        }

        function renderPagination(id, page, total, cb) {
            var el = document.getElementById(id);
            el.innerHTML = '';
            if (total <= 1) return;
            var prev = document.createElement('li');
            prev.className = 'page-item' + (page === 1 ? ' disabled' : '');
            prev.innerHTML = '<a class="page-link" href="#">&laquo;</a>';
            if (page > 1) prev.onclick = function (e) { e.preventDefault(); cb(page - 1); };
            el.appendChild(prev);
            for (var i = 1; i <= total; i++) {
                var li = document.createElement('li');
                li.className = 'page-item' + (i === page ? ' active' : '');
                li.innerHTML = '<a class="page-link" href="#">' + i + '</a>';
                (function (p) { li.onclick = function (e) { e.preventDefault(); cb(p); }; })(i);
                el.appendChild(li);
            }
            var next = document.createElement('li');
            next.className = 'page-item' + (page === total ? ' disabled' : '');
            next.innerHTML = '<a class="page-link" href="#">&raquo;</a>';
            if (page < total) next.onclick = function (e) { e.preventDefault(); cb(page + 1); };
            el.appendChild(next);
        }

        function renderActiveSubjects() {
            var start = (activePage - 1) * PAGE_SIZE;
            var end = Math.min(start + PAGE_SIZE, activeSubjects.length);
            var totalPages = Math.ceil(activeSubjects.length / PAGE_SIZE);
            document.getElementById('activeSubjectsBody').innerHTML = activeSubjects.slice(start, end).map(function (s) { return renderRow(s, false); }).join('');
            document.getElementById('activeCount').textContent = activeSubjects.length;
            document.getElementById('activePageInfo').textContent = activeSubjects.length > 0 ? (start + 1) + '-' + end + ' / ' + activeSubjects.length + ' 件' : '0 件';
            renderPagination('activePagination', activePage, totalPages, function (p) { activePage = p; renderActiveSubjects(); });
            document.getElementById('activeSubjectsCard').style.display = activeSubjects.length > 0 ? 'block' : 'none';
        }

        function renderArchivedSubjects() {
            var start = (archivedPage - 1) * PAGE_SIZE;
            var end = Math.min(start + PAGE_SIZE, archivedSubjects.length);
            var totalPages = Math.ceil(archivedSubjects.length / PAGE_SIZE);
            document.getElementById('archivedSubjectsBody').innerHTML = archivedSubjects.slice(start, end).map(function (s) { return renderRow(s, true); }).join('');
            document.getElementById('archivedCount').textContent = archivedSubjects.length;
            document.getElementById('archivedPageInfo').textContent = archivedSubjects.length > 0 ? (start + 1) + '-' + end + ' / ' + archivedSubjects.length + ' 件' : '0 件';
            renderPagination('archivedPagination', archivedPage, totalPages, function (p) { archivedPage = p; renderArchivedSubjects(); });
            document.getElementById('archivedSubjectsCard').style.display = archivedSubjects.length > 0 ? 'block' : 'none';
        }

        renderActiveSubjects();
        renderArchivedSubjects();
        if (activeSubjects.length === 0 && archivedSubjects.length === 0) {
            document.getElementById('noSubjectsCard').classList.remove('d-none');
            document.getElementById('activeSubjectsCard').style.display = 'none';
            document.getElementById('archivedSubjectsCard').style.display = 'none';
        }
    })();
</script>
{{end}}