{% extends "base.html" %}

{% block title %}{{ topic.title }}{% endblock %}

{% block content %}
<div class="container-fluid">
    <!-- Breadcrumb -->
    <nav aria-label="breadcrumb" class="mb-4">
        <ol class="breadcrumb">
            <li class="breadcrumb-item"><a href="/">Startseite</a></li>
            {% if parent_topic %}
            <li class="breadcrumb-item"><a href="/topic/{{ parent_topic.id }}">{{ parent_topic.title }}</a></li>
            {% endif %}
            <li class="breadcrumb-item active">{{ topic.title }}</li>
        </ol>
    </nav>

    <!-- Topic Header -->
    <div class="row mb-4">
        <div class="col-12">
            <div class="card">
                <div class="card-body">
                    <div class="d-flex align-items-center mb-3">
                        <i class="bi bi-{{ topic.icon|default('file-text') }} text-primary display-4 me-3"></i>
                        <div>
                            <h1 class="mb-1">{{ topic.title }}</h1>
                            <p class="text-muted mb-0">{{ topic.description }}</p>
                        </div>
                    </div>

                    {% if topic.tags %}
                    <div class="mt-3">
                        {% for tag in topic.tags %}
                        <span class="badge bg-secondary me-1">{{ tag }}</span>
                        {% endfor %}
                    </div>
                    {% endif %}
                </div>
            </div>
        </div>
    </div>

    <!-- Topic Content -->
    <div class="row">
        <div class="col-lg-9">
            <div class="card">
                <div class="card-body content-body">
                    {{ topic.content|safe }}
                </div>
            </div>

            <!-- Child Topics / Subpages -->
            {% if child_topics %}
            <div class="card mt-4">
                <div class="card-header bg-primary bg-opacity-10">
                    <h5 class="mb-0"><i class="bi bi-folder2-open me-2"></i>Unterseiten</h5>
                </div>
                <div class="card-body">
                    <div class="row">
                        {% for child in child_topics %}
                        <div class="col-md-6 mb-3">
                            <a href="/topic/{{ child.id }}" class="text-decoration-none">
                                <div class="card h-100 hover-shadow">
                                    <div class="card-body py-3">
                                        <div class="d-flex align-items-center">
                                            <i class="bi bi-{{ child.icon|default('file-text') }} text-primary me-3 fs-4"></i>
                                            <div>
                                                <h6 class="mb-1">{{ child.title }}</h6>
                                                {% if child.description %}
                                                <small class="text-muted">{{ child.description }}</small>
                                                {% endif %}
                                            </div>
                                        </div>
                                    </div>
                                </div>
                            </a>
                        </div>
                        {% endfor %}
                    </div>
                </div>
            </div>
            {% endif %}

            <!-- Related Topics -->
            {% if topic.related %}
            <div class="card mt-4">
                <div class="card-header">
                    <h5 class="mb-0"><i class="bi bi-link-45deg me-2"></i>Verwandte Themen</h5>
                </div>
                <div class="card-body">
                    <div class="row">
                        {% for related_id in topic.related %}
                        {% for section in content.sections %}
                        {% for t in section.topics %}
                        {% if t.id == related_id %}
                        <div class="col-md-6 mb-2">
                            <a href="/topic/{{ t.id }}" class="text-decoration-none">
                                <div class="d-flex align-items-center p-2 rounded hover-bg">
                                    <i class="bi bi-{{ t.icon|default('file-text') }} text-primary me-2"></i>
                                    <span>{{ t.title }}</span>
                                </div>
                            </a>
                        </div>
                        {% endif %}
                        {% endfor %}
                        {% endfor %}
                        {% endfor %}
                    </div>
                </div>
            </div>
            {% endif %}
        </div>

        <!-- Sidebar (Sticky) -->
        <div class="col-lg-3">
            <div class="toc-sidebar">
                <!-- Table of Contents -->
                {% if topic.toc %}
                <div class="card mb-4 toc-card">
                    <div class="card-header">
                        <h6 class="mb-0"><i class="bi bi-list-ul me-2"></i>Inhalt</h6>
                    </div>
                    <div class="card-body py-2">
                        <nav class="toc-nav" id="toc-nav">
                            {% for item in topic.toc %}
                            <a href="#{{ item.id }}" class="toc-link {% if item.level == 3 %}toc-link-sub{% endif %}" data-target="{{ item.id }}">
                                {{ item.title }}
                            </a>
                            {% endfor %}
                        </nav>
                    </div>
                </div>
                {% endif %}

                <!-- Quick Tips -->
                {% if topic.tips %}
                <div class="card">
                    <div class="card-header bg-success bg-opacity-25">
                        <h6 class="mb-0 text-success"><i class="bi bi-lightbulb me-2"></i>Tipps</h6>
                    </div>
                    <div class="card-body">
                        <ul class="list-unstyled mb-0">
                            {% for tip in topic.tips %}
                            <li class="mb-2">
                                <i class="bi bi-check-circle text-success me-1"></i>
                                {{ tip }}
                            </li>
                            {% endfor %}
                        </ul>
                    </div>
                </div>
                {% endif %}
            </div>
        </div>
    </div>

    <!-- Navigation -->
    <div class="row mt-4">
        <div class="col-12">
            <div class="d-flex justify-content-between">
                <a href="/" class="btn btn-outline-secondary">
                    <i class="bi bi-arrow-left me-2"></i>Zurueck zur Uebersicht
                </a>
            </div>
        </div>
    </div>
</div>
{% endblock %}

{% block scripts %}
<script>
// Scroll-Spy for TOC
document.addEventListener('DOMContentLoaded', function() {
    const tocNav = document.getElementById('toc-nav');
    if (!tocNav) return;

    const tocLinks = tocNav.querySelectorAll('.toc-link');
    if (tocLinks.length === 0) return;

    // Get all headings that are in the TOC
    const headingIds = Array.from(tocLinks).map(link => link.getAttribute('data-target'));
    const headings = headingIds.map(id => document.getElementById(id)).filter(el => el);

    if (headings.length === 0) return;

    function updateActiveLink() {
        const scrollPos = window.scrollY + 100; // Offset for better UX

        let activeIndex = 0;

        // Find the heading that is currently in view
        for (let i = 0; i < headings.length; i++) {
            if (headings[i].offsetTop <= scrollPos) {
                activeIndex = i;
            }
        }

        // Update active state
        tocLinks.forEach((link, index) => {
            if (index === activeIndex) {
                link.classList.add('active');
            } else {
                link.classList.remove('active');
            }
        });
    }

    // Throttle scroll events
    let ticking = false;
    window.addEventListener('scroll', function() {
        if (!ticking) {
            window.requestAnimationFrame(function() {
                updateActiveLink();
                ticking = false;
            });
            ticking = true;
        }
    });

    // Initial update
    updateActiveLink();

    // Smooth scroll with offset when clicking TOC links
    tocLinks.forEach(link => {
        link.addEventListener('click', function(e) {
            e.preventDefault();
            const targetId = this.getAttribute('data-target');
            const target = document.getElementById(targetId);
            if (target) {
                const offset = 20;
                const targetPos = target.offsetTop - offset;
                window.scrollTo({
                    top: targetPos,
                    behavior: 'smooth'
                });
            }
        });
    });
});
</script>
{% endblock %}