/* ═══════════════════════════════════════════════════════
   CONTRABAND //  Resource Database Controller
   ═══════════════════════════════════════════════════════ */
(function () {
    'use strict';

    const API = '/api/contraband';
    const root = document.getElementById('contrabandRoot');
    if (!root) return;

    let state = { view: 'index', categories: [], searchTimeout: null };

    // ─── Utilities ───────────────────────────────────────
    function esc(s) {
        const d = document.createElement('div');
        d.textContent = s || '';
        return d.innerHTML;
    }

    function fmt(n) {
        return n.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
    }

    // ─── API Fetch ───────────────────────────────────────
    async function api(endpoint) {
        const res = await fetch(API + endpoint);
        if (!res.ok) throw new Error(`API ${res.status}`);
        return res.json();
    }

    // ─── Render: Index View ──────────────────────────────
    function renderIndex(data) {
        state.view = 'index';
        state.categories = data.categories || [];

        let html = '';

        // Stats bar
        html += `<div class="crt-stats-bar">
            <div class="crt-stat"><span class="crt-stat-label">DATABASE</span><span class="crt-stat-value">● ONLINE</span></div>
            <div class="crt-stat"><span class="crt-stat-label">TOTAL ASSETS</span><span class="crt-stat-value">${fmt(data.total_entries)}</span></div>
            <div class="crt-stat"><span class="crt-stat-label">STARRED</span><span class="crt-stat-value amber">${fmt(data.total_starred)}</span></div>
            <div class="crt-stat"><span class="crt-stat-label">CATEGORIES</span><span class="crt-stat-value">${data.total_categories}</span></div>
            <div class="crt-stat"><span class="crt-stat-label">STATUS</span><span class="crt-stat-value">● DECLASSIFIED</span></div>
        </div>`;

        // Search
        html += `<div class="crt-search-container">
            <span class="crt-search-icon">⌕</span>
            <input type="text" class="crt-search-input" id="crtSearch" placeholder="SEARCH ALL ASSETS..." autocomplete="off">
            <span class="crt-search-count" id="crtSearchCount"></span>
        </div>`;

        // Search results container
        html += `<div class="crt-search-results" id="crtSearchResults"></div>`;

        // Category grid
        html += `<div class="crt-grid" id="crtGrid">`;
        for (const cat of state.categories) {
            if (cat.entry_count === 0) continue;
            html += `<div class="crt-card" data-slug="${esc(cat.slug)}">
                <span class="crt-card-icon">${cat.icon}</span>
                <div class="crt-card-code">${esc(cat.code)}</div>
                <div class="crt-card-name">${esc(cat.name)}</div>
                <div class="crt-card-meta">
                    <span class="crt-card-count">${fmt(cat.entry_count)} assets</span>
                    <span class="crt-card-stars">⭐ ${cat.starred_count}</span>
                </div>
                <div class="crt-card-status">● ACCESSIBLE</div>
            </div>`;
        }
        html += `</div>`;

        // End of grid

        root.innerHTML = html;
        bindIndexEvents();
    }

    // ─── Render: Category Detail ─────────────────────────
    function renderCategory(cat) {
        state.view = 'detail';
        let html = '';

        // Back button
        html += `<div class="crt-back" id="crtBack">◄ BACK TO INDEX</div>`;

        // Detail header
        html += `<div class="crt-detail-header">
            <div class="crt-detail-code">${esc(cat.code)}</div>
            <div class="crt-detail-title">${esc(cat.icon)} ${esc(cat.name)}</div>
            <div class="crt-detail-meta">
                <span>${fmt(cat.entry_count)} ASSETS</span>
                <span>⭐ ${cat.starred_count} STARRED</span>
                <span>${cat.subcategory_count} SECTIONS</span>
            </div>
        </div>`;

        // Search within category
        html += `<div class="crt-search-container">
            <span class="crt-search-icon">⌕</span>
            <input type="text" class="crt-search-input" id="crtCatSearch" placeholder="FILTER THIS CATEGORY..." autocomplete="off">
        </div>`;

        // Filter buttons
        html += `<div class="crt-filters">
            <button class="crt-filter-btn active" data-filter="all">ALL (${fmt(cat.entry_count)})</button>
            <button class="crt-filter-btn" data-filter="starred">⭐ STARRED (${cat.starred_count})</button>
        </div>`;

        // Subcategories
        html += `<div id="crtSubcategories">`;
        for (let i = 0; i < cat.subcategories.length; i++) {
            const sub = cat.subcategories[i];
            if (sub.entries.length === 0 && sub.notes.length === 0) continue;

            html += `<div class="crt-subcategory" data-sub-idx="${i}">`;
            html += `<div class="crt-sub-header collapsed" data-toggle="${i}">
                <span class="crt-sub-toggle">▸</span>
                <span class="crt-sub-name">${esc(sub.name)}</span>
                <span class="crt-sub-count">${sub.entries.length} items</span>
            </div>`;

            // Notes
            if (sub.notes && sub.notes.length > 0) {
                html += `<div class="crt-sub-notes" style="display:none" id="crtNotes${i}">`;
                for (const note of sub.notes) {
                    html += `⚠ ${esc(note)}<br>`;
                }
                html += `</div>`;
            }

            // Entries
            html += `<div class="crt-entries" id="crtEntries${i}" style="display:none">`;
            for (const entry of sub.entries) {
                html += renderEntry(entry);
            }
            html += `</div></div>`;
        }
        html += `</div>`;

        // End of grid

        root.innerHTML = html;
        bindDetailEvents(cat);
    }

    // ─── Render: Single Entry ────────────────────────────
    function renderEntry(entry) {
        const starClass = entry.starred ? ' starred' : '';
        const starIcon = entry.starred ? '⭐' : '·';
        let html = `<div class="crt-entry${starClass}">`;
        html += `<span class="crt-entry-star">${starIcon}</span>`;
        html += `<div class="crt-entry-content">`;

        if (entry.url) {
            html += `<div class="crt-entry-name"><a href="${esc(entry.url)}" target="_blank" rel="noopener">${esc(entry.name || entry.url)}</a></div>`;
        } else if (entry.name) {
            html += `<div class="crt-entry-name">${esc(entry.name)}</div>`;
        }

        if (entry.description) {
            html += `<div class="crt-entry-desc">${esc(entry.description)}</div>`;
        }

        if (entry.extra_links && entry.extra_links.length > 0) {
            html += `<div class="crt-entry-extra">`;
            for (const link of entry.extra_links) {
                html += `<a href="${esc(link.url)}" target="_blank" rel="noopener">${esc(link.name)}</a>`;
            }
            html += `</div>`;
        }

        html += `</div></div>`;
        return html;
    }

    // ─── Render: Search Results ──────────────────────────
    function renderSearchResults(data) {
        const container = document.getElementById('crtSearchResults');
        const countEl = document.getElementById('crtSearchCount');
        const grid = document.getElementById('crtGrid');

        if (!data.results || data.results.length === 0) {
            container.innerHTML = data.query ? '<div class="crt-empty">NO MATCHING ASSETS FOUND</div>' : '';
            countEl.textContent = data.query ? '0 RESULTS' : '';
            if (grid) grid.style.display = data.query ? 'none' : '';
            return;
        }

        countEl.textContent = `${data.results.length} RESULTS`;
        if (grid) grid.style.display = 'none';

        let html = '';
        for (const r of data.results) {
            const starIcon = r.starred ? '⭐ ' : '';
            html += `<div class="crt-search-result">`;
            html += `<div class="crt-result-breadcrumb">${esc(r.category_code)} // ${esc(r.category_name)} / ${esc(r.subcategory)}</div>`;
            html += `<div class="crt-result-name">${starIcon}`;
            if (r.url) {
                html += `<a href="${esc(r.url)}" target="_blank" rel="noopener">${esc(r.name || r.url)}</a>`;
            } else {
                html += esc(r.name);
            }
            html += `</div>`;
            if (r.description) {
                html += `<div class="crt-result-desc">${esc(r.description)}</div>`;
            }
            html += `</div>`;
        }
        container.innerHTML = html;
    }

    // ─── Event Bindings: Index ───────────────────────────
    function bindIndexEvents() {
        // Card clicks
        document.querySelectorAll('.crt-card').forEach(card => {
            card.addEventListener('click', () => {
                const slug = card.dataset.slug;
                loadCategory(slug);
            });
        });

        // Global search
        const searchInput = document.getElementById('crtSearch');
        if (searchInput) {
            searchInput.addEventListener('input', () => {
                clearTimeout(state.searchTimeout);
                const q = searchInput.value.trim();
                if (q.length < 2) {
                    renderSearchResults({ query: '', results: [] });
                    return;
                }
                state.searchTimeout = setTimeout(async () => {
                    try {
                        const data = await api(`/search?q=${encodeURIComponent(q)}&limit=100`);
                        renderSearchResults(data);
                    } catch (e) {
                        console.warn('Search failed:', e);
                    }
                }, 300);
            });
        }
    }

    // ─── Event Bindings: Detail ──────────────────────────
    function bindDetailEvents(cat) {
        // Back button
        document.getElementById('crtBack').addEventListener('click', () => {
            loadIndex();
        });

        // Subcategory toggle (collapse/expand)
        document.querySelectorAll('.crt-sub-header').forEach(header => {
            header.addEventListener('click', () => {
                const idx = header.dataset.toggle;
                const entries = document.getElementById(`crtEntries${idx}`);
                if (!entries) return;
                const isCollapsed = header.classList.contains('collapsed');
                const notes = document.getElementById(`crtNotes${idx}`);
                if (isCollapsed) {
                    header.classList.remove('collapsed');
                    entries.style.display = '';
                    if (notes) notes.style.display = '';
                    header.querySelector('.crt-sub-toggle').textContent = '▾';
                } else {
                    header.classList.add('collapsed');
                    entries.style.display = 'none';
                    if (notes) notes.style.display = 'none';
                    header.querySelector('.crt-sub-toggle').textContent = '▸';
                }
            });
        });

        // Filter buttons
        document.querySelectorAll('.crt-filter-btn').forEach(btn => {
            btn.addEventListener('click', () => {
                document.querySelectorAll('.crt-filter-btn').forEach(b => b.classList.remove('active'));
                btn.classList.add('active');
                const filter = btn.dataset.filter;
                document.querySelectorAll('.crt-entry').forEach(entry => {
                    if (filter === 'starred') {
                        entry.style.display = entry.classList.contains('starred') ? '' : 'none';
                    } else {
                        entry.style.display = '';
                    }
                });
            });
        });

        // Category search (local filter)
        const catSearch = document.getElementById('crtCatSearch');
        if (catSearch) {
            catSearch.addEventListener('input', () => {
                const q = catSearch.value.trim().toLowerCase();
                document.querySelectorAll('.crt-entry').forEach(entry => {
                    if (!q) {
                        entry.style.display = '';
                        return;
                    }
                    const text = entry.textContent.toLowerCase();
                    entry.style.display = text.includes(q) ? '' : 'none';
                });
                // Hide empty subcategories
                document.querySelectorAll('.crt-subcategory').forEach(sub => {
                    const visible = sub.querySelectorAll('.crt-entry:not([style*="display: none"])');
                    sub.style.display = visible.length > 0 || !q ? '' : 'none';
                });
            });
        }
    }

    // ─── Load Functions ──────────────────────────────────
    async function loadIndex() {
        root.innerHTML = '<div class="crt-loading">ACCESSING CONTRABAND DATABASE...</div>';
        try {
            const data = await api('');
            renderIndex(data);
            history.pushState({ view: 'index' }, '', '/depot/contraband');
        } catch (e) {
            root.innerHTML = `<div class="crt-empty">DATABASE ACCESS DENIED // ${esc(e.message)}</div>`;
        }
    }

    async function loadCategory(slug) {
        root.innerHTML = '<div class="crt-loading">DECRYPTING CATEGORY DATA...</div>';
        try {
            const data = await api(`/${slug}`);
            renderCategory(data);
            history.pushState({ view: 'detail', slug }, '', `/depot/contraband?cat=${slug}`);
            window.scrollTo({ top: 0, behavior: 'smooth' });
        } catch (e) {
            root.innerHTML = `<div class="crt-empty">CATEGORY NOT FOUND // ${esc(e.message)}</div>`;
        }
    }

    // ─── Handle Back/Forward ─────────────────────────────
    window.addEventListener('popstate', (e) => {
        if (e.state && e.state.view === 'detail' && e.state.slug) {
            loadCategory(e.state.slug);
        } else {
            loadIndex();
        }
    });

    // ─── Init ────────────────────────────────────────────
    function init() {
        // Check URL for category param
        const params = new URLSearchParams(window.location.search);
        const cat = params.get('cat');
        if (cat) {
            loadCategory(cat);
        } else {
            loadIndex();
        }
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }
})();