{% extends "admin_layout.html" %}
{% block admin_title %}后台总览{% endblock %}
{% block admin_page_content %}
<section class="metric-grid reveal-up delay-2">
    <article class="metric-card">
        <span>用户数</span>
        <strong id="stat-users">{{ stats.users_count }}</strong>
        <small>已录入的学生账号</small>
    </article>
    <article class="metric-card">
        <span>运行中任务</span>
        <strong id="stat-running">{{ stats.running_count }}</strong>
        <small>排队中：<span id="stat-pending">{{ stats.pending_count }}</span></small>
    </article>
    <article class="metric-card">
        <span>总课程目标</span>
        <strong>{{ stats.courses_count }}</strong>
        <small>管理员可见全部课程号与课序号</small>
    </article>
    <article class="metric-card">
        <span>有效定时任务</span>
        <strong>{{ stats.active_schedule_count }}</strong>
        <small>管理员配置的每日自动启动与停止</small>
    </article>
    <article class="metric-card">
        <span>注册码总数</span>
        <strong>{{ stats.registration_code_count }}</strong>
        <small>支持用户按注册码自助注册</small>
    </article>
</section>

<section class="content-grid admin-grid">
    <article class="card reveal-up delay-2">
        <div class="card-head">
            <span class="kicker">分页面管理</span>
            <h2>功能入口</h2>
            <p>不同功能已经拆分到独立页面，避免全部堆在首页。</p>
        </div>
        <div class="button-row wrap-row">
            <a href="{{ url_for('admin_users') }}" class="btn btn-primary">进入用户管理</a>
            <a href="{{ url_for('admin_schedules') }}" class="btn btn-secondary">进入定时任务</a>
            <a href="{{ url_for('admin_registration_codes') }}" class="btn btn-secondary">进入注册码</a>
            <a href="{{ url_for('admin_logs') }}" class="btn btn-ghost">查看运行日志</a>
        </div>
    </article>

    <article class="card reveal-up delay-2">
        <div class="card-head">
            <span class="kicker">调度设置</span>
            <h2>并行数</h2>
            <p>默认并行数已调整为 4，建议根据 Hugging Face Space 的资源情况适当调节。</p>
        </div>
        <form method="post" action="{{ url_for('update_parallel_limit') }}" class="form-grid form-grid-compact">
            <label class="field">
                <span>当前并行数</span>
                <input type="number" id="parallel-limit-input" name="parallel_limit" min="1" max="8" value="{{ parallel_limit }}" required>
            </label>
            <button type="submit" class="btn btn-primary">更新并行数</button>
        </form>
    </article>

    {% if is_super_admin %}
    <article class="card reveal-up delay-2">
        <div class="card-head">
            <span class="kicker">管理员管理</span>
            <h2>新增管理员</h2>
            <p>只有超级管理员可以继续创建普通管理员。</p>
        </div>
        <form method="post" action="{{ url_for('create_admin') }}" class="form-grid form-grid-compact">
            <label class="field">
                <span>管理员账号</span>
                <input type="text" name="username" placeholder="输入管理员账号" required>
            </label>
            <label class="field">
                <span>管理员密码</span>
                <input type="password" name="password" placeholder="输入管理员密码" required>
            </label>
            <button type="submit" class="btn btn-ghost">创建管理员</button>
        </form>
        <div class="chip-row">
            <span class="chip highlight">超级管理员：{{ admin_identity.username }}</span>
            {% for admin in admins %}
                <span class="chip">{{ admin.username }}</span>
            {% endfor %}
        </div>
    </article>
    {% endif %}

    <article class="card reveal-up delay-3 span-2">
        <div class="card-head split">
            <div>
                <span class="kicker">任务总览</span>
                <h2>最近任务</h2>
                <p>用于快速确认任务是否正在排队、执行、停止或失败。</p>
            </div>
            <span class="status-pill status-running">实时刷新</span>
        </div>
        <div class="course-table-wrap">
            <table class="data-table">
                <thead>
                    <tr>
                        <th>任务</th>
                        <th>学号</th>
                        <th>状态</th>
                        <th>尝试</th>
                        <th>错误</th>
                        <th>刷新间隔</th>
                        <th>触发者</th>
                        <th>更新时间</th>
                    </tr>
                </thead>
                <tbody>
                    {% if recent_tasks %}
                        {% for task in recent_tasks %}
                            <tr>
                                <td>#{{ task.id }}</td>
                                <td>{{ task.student_id }}</td>
                                <td><span class="status-pill status-{{ task.status }}">{{ task_labels.get(task.status, task.status) }}</span></td>
                                <td>{{ task.total_attempts }}</td>
                                <td>{{ task.total_errors }}</td>
                                <td>{{ task.refresh_interval_seconds or default_refresh_interval_seconds }} 秒</td>
                                <td>{{ task.requested_by_role }}:{{ task.requested_by }}</td>
                                <td>{{ task.updated_at }}</td>
                            </tr>
                        {% endfor %}
                    {% else %}
                        <tr>
                            <td colspan="8" class="empty-cell">还没有任务记录。</td>
                        </tr>
                    {% endif %}
                </tbody>
            </table>
        </div>
    </article>
</section>
{% endblock %}