{% extends "base.html" %}
{% block title %}Exercises — Python 108{% endblock %}
{% block content %}
<div class="exercises-page">

  <div class="page-header">
    <div>
      <h1 class="page-title">Exercise Book</h1>
      <p class="page-sub">{{ solved }} of {{ total }} exercises solved</p>
    </div>
  </div>

  <!-- Progress bar -->
  <div class="progress-bar-track" style="margin-bottom:1.5rem">
    <div class="progress-bar-fill" style="width:{{ (solved/total*100)|round|int }}%"></div>
  </div>

  <!-- Filters -->
  <form method="GET" class="filter-row">
    <select name="diff" class="filter-select" onchange="this.form.submit()">
      <option value="" {% if not diff_filter %}selected{% endif %}>All levels</option>
      <option value="Easy"   {% if diff_filter=='Easy' %}selected{% endif %}>Easy</option>
      <option value="Medium" {% if diff_filter=='Medium' %}selected{% endif %}>Medium</option>
      <option value="Hard"   {% if diff_filter=='Hard' %}selected{% endif %}>Hard</option>
    </select>
    <select name="mod" class="filter-select" onchange="this.form.submit()">
      <option value="" {% if not mod_filter %}selected{% endif %}>All modules</option>
      {% for m in modules %}
      <option value="{{ m }}" {% if mod_filter==m %}selected{% endif %}>{{ m }}</option>
      {% endfor %}
    </select>
    {% if diff_filter or mod_filter %}
    <a href="{{ url_for('exercises') }}" class="btn btn-ghost">Clear filters</a>
    {% endif %}
  </form>

  <!-- Exercise list -->
  <div class="ex-list">
    {% for ex in exercises %}
    <div class="ex-row {% if ex_progress.get(ex.n, 0) %}ex-solved{% endif %}">
      <div class="ex-row-left">
        <span class="ex-num">#{{ ex.n }}</span>
        <span class="diff-badge diff-{{ ex.diff|lower }}">{{ ex.diff }}</span>
        <span class="ex-title">{{ ex.q[:80] }}{% if ex.q|length > 80 %}…{% endif %}</span>
      </div>
      <div class="ex-row-right">
        {% if ex_progress.get(ex.n, 0) %}
        <span class="solved-check">✓ Solved</span>
        {% endif %}
        <a href="{{ url_for('exercise', n=ex.n) }}" class="btn btn-sm btn-outline">
          {% if ex_progress.get(ex.n, 0) %}Review{% else %}Solve{% endif %}
        </a>
      </div>
    </div>
    {% endfor %}
  </div>

</div>
{% endblock %}