// ============================================
// CORE - Initialisierung und Rendering
// Gutachter Symbolbibliothek v2.0
// ============================================

// ========== GLOBALE VARIABLEN ==========
let currentFilter = 'all';
let currentSearch = '';
let selectedSymbols = new Set();
let legendItems = [];

// ========== INITIALISIERUNG ==========
document.addEventListener('DOMContentLoaded', function() {
    renderSymbols();
    setupEventListeners();
    loadLegendFromStorage();
});

// ========== EVENT LISTENERS ==========
function setupEventListeners() {
    // Suche
    document.getElementById('searchInput').addEventListener('input', function(e) {
        currentSearch = e.target.value.toLowerCase();
        renderSymbols();
    });

    // Filter Pills
    document.querySelectorAll('.filter-pill').forEach(pill => {
        pill.addEventListener('click', function() {
            document.querySelectorAll('.filter-pill').forEach(p => p.classList.remove('active'));
            this.classList.add('active');
            currentFilter = this.dataset.filter;
            renderSymbols();
        });
    });

    // Modal schließen
    document.getElementById('legendModal').addEventListener('click', function(e) {
        if (e.target === this) {
            closeLegendModal();
        }
    });

    // Escape-Taste zum Schließen
    document.addEventListener('keydown', function(e) {
        if (e.key === 'Escape') {
            closeLegendModal();
        }
    });
}

// ========== SYMBOLE RENDERN ==========
function renderSymbols() {
    const container = document.getElementById('symbolGrid');
    container.innerHTML = '';

    let hasResults = false;

    Object.keys(SYMBOLS).forEach(categoryKey => {
        const category = SYMBOLS[categoryKey];

        // Filter nach Kategorie
        if (currentFilter !== 'all' && currentFilter !== categoryKey) {
            return;
        }

        const filteredItems = category.items.filter(item => {
            if (!currentSearch) return true;
            return item.name.toLowerCase().includes(currentSearch) ||
                   item.tags.some(tag => tag.toLowerCase().includes(currentSearch));
        });

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

        hasResults = true;

        // Kategorie-Header
        const categoryHeader = document.createElement('div');
        categoryHeader.className = 'category-header';
        categoryHeader.innerHTML = `<span>${category.icon} ${category.name}</span><span class="category-count">${filteredItems.length} Symbole</span>`;
        container.appendChild(categoryHeader);

        // Symbol-Grid für diese Kategorie
        const categoryGrid = document.createElement('div');
        categoryGrid.className = 'category-grid';

        filteredItems.forEach(item => {
            const card = createSymbolCard(item, categoryKey);
            categoryGrid.appendChild(card);
        });

        container.appendChild(categoryGrid);
    });

    if (!hasResults) {
        container.innerHTML = '<div class="no-results">Keine Symbole gefunden. Versuchen Sie einen anderen Suchbegriff.</div>';
    }
}

// ========== SYMBOL-KARTE ERSTELLEN ==========
function createSymbolCard(item, categoryKey) {
    const card = document.createElement('div');
    card.className = 'symbol-card';

    // Spezielle Klasse für Vermessungssymbole
    if (categoryKey.startsWith('vermessung_')) {
        card.classList.add('vermessung');
    }

    const isSelected = selectedSymbols.has(item.id);
    if (isSelected) {
        card.classList.add('selected');
    }

    card.innerHTML = `
        <div class="symbol-preview">${item.svg}</div>
        <div class="symbol-name">${item.name}</div>
        <div class="symbol-actions">
            <button class="btn-action btn-copy" onclick="copyAsImage('${item.id}')" title="Als Bild kopieren (transparent)">
                📋 Kopieren
            </button>
            <button class="btn-action btn-svg" onclick="downloadSVG('${item.id}')" title="SVG herunterladen">
                ⬇️ SVG
            </button>
            <button class="btn-action btn-png" onclick="downloadSymbolPNG('${item.id}')" title="PNG herunterladen">PNG</button>
            <button class="btn-action btn-jpg" onclick="downloadSymbolJPG('${item.id}')" title="JPG herunterladen">JPG</button>
            <button class="btn-action btn-dxf" onclick="downloadDXF('${item.id}')" title="DXF herunterladen">
                📐 DXF
            </button>
            <button class="btn-action btn-legend ${isSelected ? 'active' : ''}" onclick="toggleLegendSelection('${item.id}')" title="Zur Legende hinzufügen">
                📑
            </button>
        </div>
    `;

    return card;
}

// ========== SYMBOL FINDEN ==========
function findSymbol(id) {
    for (const categoryKey of Object.keys(SYMBOLS)) {
        const item = SYMBOLS[categoryKey].items.find(i => i.id === id);
        if (item) return item;
    }
    return null;
}