{{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;
    }
</style>
{{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">
        <i class="bi bi-clock-history me-2"></i>期限内完了率
    </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">
                <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">
                <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>
{{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;

        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}}