/* ── Olimpic Nastri — App JS v2 ─────────────────────────────────────────── */

// ── CSRF helper ──
function getCsrf() {
    return document.cookie.split('; ')
        .find(r => r.startsWith('csrftoken='))
        ?.split('=')[1] ?? '';
}

// ── Toast notifications ──
function showToast(message, type = 'success') {
    const container = document.getElementById('toast-container');
    if (!container) return;

    const icons = {
        success: 'bi-check-circle-fill',
        danger: 'bi-exclamation-triangle-fill',
        info: 'bi-info-circle-fill',
    };
    const colors = {
        success: '#15803d',
        danger: '#dc2626',
        info: '#4361ee',
    };

    const id = 'toast-' + Date.now();
    const html = `
        <div id="${id}" class="toast align-items-center text-white border-0 mb-2" role="alert"
             style="background:${colors[type] || colors.success};">
            <div class="d-flex">
                <div class="toast-body d-flex align-items-center gap-2">
                    <i class="bi ${icons[type] || icons.success}"></i>
                    ${message}
                </div>
                <button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast"></button>
            </div>
        </div>`;
    container.insertAdjacentHTML('beforeend', html);
    const toastEl = document.getElementById(id);
    const bsToast = new bootstrap.Toast(toastEl, { delay: 3000 });
    bsToast.show();
    toastEl.addEventListener('hidden.bs.toast', () => toastEl.remove());
}

// ── Convert Django messages to toasts on page load ──
function convertMessagesToToasts() {
    document.querySelectorAll('[data-toast-message]').forEach(el => {
        showToast(el.dataset.toastMessage, el.dataset.toastType || 'success');
        el.remove();
    });
}

// ── Progress slider AJAX ──
function initSliders() {
    document.querySelectorAll('.progress-slider').forEach(slider => {
        if (slider._sliderInit) return;
        slider._sliderInit = true;

        const id = slider.dataset.id;
        const lbl = document.getElementById('lbl-' + id);
        const saving = document.getElementById('saving-' + id);
        let timer = null;

        slider.addEventListener('input', () => {
            const v = slider.value;
            if (lbl) lbl.textContent = v + '%';
            slider.style.setProperty('--val', v + '%');
        });

        slider.addEventListener('change', () => {
            clearTimeout(timer);
            if (saving) {
                saving.classList.remove('d-none');
                saving.textContent = 'salvataggio…';
            }
            timer = setTimeout(() => {
                fetch(slider.dataset.url, {
                    method: 'POST',
                    headers: {
                        'X-CSRFToken': getCsrf(),
                        'Content-Type': 'application/x-www-form-urlencoded',
                    },
                    body: 'avanzamento=' + slider.value,
                })
                .then(r => r.json())
                .then(d => {
                    if (saving) {
                        saving.textContent = d.ok ? '✓ salvato' : '⚠ errore';
                        setTimeout(() => saving.classList.add('d-none'), 1500);
                    }
                })
                .catch(() => {
                    if (saving) {
                        saving.textContent = '⚠ errore';
                        setTimeout(() => saving.classList.add('d-none'), 1500);
                    }
                });
            }, 400);
        });
    });
}

// ── Live search dropdown ──
function initLiveSearch() {
    const input = document.getElementById('search-input');
    const dropdown = document.getElementById('search-dropdown');
    if (!input || !dropdown) return;

    let timer = null;

    input.addEventListener('input', () => {
        const q = input.value.trim();
        clearTimeout(timer);

        if (q.length < 2) {
            dropdown.classList.remove('show');
            dropdown.innerHTML = '';
            return;
        }

        timer = setTimeout(() => {
            fetch('/ricerca/?q=' + encodeURIComponent(q), {
                headers: { 'HX-Request': 'true' }
            })
            .then(r => r.text())
            .then(html => {
                dropdown.innerHTML = html;
                dropdown.classList.add('show');
            });
        }, 300);
    });

    // Close dropdown on click outside
    document.addEventListener('click', (e) => {
        if (!input.contains(e.target) && !dropdown.contains(e.target)) {
            dropdown.classList.remove('show');
        }
    });

    // Navigate to full search on Enter
    input.closest('form')?.addEventListener('submit', (e) => {
        dropdown.classList.remove('show');
    });
}

// ── Init everything ──
function initApp() {
    convertMessagesToToasts();
    initSliders();
    initLiveSearch();
    initMentions();
}

// ── @Mentions autocomplete ──
function initMentions() {
    document.querySelectorAll('textarea.form-control').forEach(textarea => {
        if (textarea._mentionInit) return;
        textarea._mentionInit = true;

        let dropdown = textarea.parentElement.querySelector('.mention-dropdown');
        if (!dropdown) {
            dropdown = document.createElement('div');
            dropdown.className = 'mention-dropdown';
            textarea.parentElement.style.position = 'relative';
            textarea.parentElement.appendChild(dropdown);
        }

        let mentionStart = -1;
        let timer = null;

        textarea.addEventListener('input', () => {
            const pos = textarea.selectionStart;
            const text = textarea.value.substring(0, pos);
            const atMatch = text.match(/@(\w[\w.]*)$/);

            if (!atMatch) {
                dropdown.classList.remove('show');
                mentionStart = -1;
                return;
            }

            mentionStart = pos - atMatch[0].length;
            const query = atMatch[1];

            clearTimeout(timer);
            timer = setTimeout(() => {
                fetch('/api/utenti/?q=' + encodeURIComponent(query))
                    .then(r => r.json())
                    .then(users => {
                        if (!users.length) {
                            dropdown.classList.remove('show');
                            return;
                        }
                        dropdown.innerHTML = users.map(u =>
                            `<div class="mention-item" data-username="${u.username}" data-nome="${u.nome}">
                                <span class="avatar" style="width:22px;height:22px;font-size:.6rem;">${u.username.substring(0,2).toUpperCase()}</span>
                                <span>${u.nome}</span>
                                <small class="text-muted">@${u.username}</small>
                            </div>`
                        ).join('');
                        dropdown.classList.add('show');
                    });
            }, 200);
        });

        dropdown.addEventListener('click', (e) => {
            const item = e.target.closest('.mention-item');
            if (!item) return;
            const username = item.dataset.username;
            const before = textarea.value.substring(0, mentionStart);
            const after = textarea.value.substring(textarea.selectionStart);
            textarea.value = before + '@' + username + ' ' + after;
            textarea.focus();
            const newPos = mentionStart + username.length + 2;
            textarea.setSelectionRange(newPos, newPos);
            dropdown.classList.remove('show');
        });

        textarea.addEventListener('blur', () => {
            setTimeout(() => dropdown.classList.remove('show'), 200);
        });

        textarea.addEventListener('keydown', (e) => {
            if (!dropdown.classList.contains('show')) return;
            const items = dropdown.querySelectorAll('.mention-item');
            const active = dropdown.querySelector('.mention-item.active');
            let idx = Array.from(items).indexOf(active);

            if (e.key === 'ArrowDown') {
                e.preventDefault();
                if (active) active.classList.remove('active');
                idx = (idx + 1) % items.length;
                items[idx].classList.add('active');
            } else if (e.key === 'ArrowUp') {
                e.preventDefault();
                if (active) active.classList.remove('active');
                idx = idx <= 0 ? items.length - 1 : idx - 1;
                items[idx].classList.add('active');
            } else if (e.key === 'Enter' && active) {
                e.preventDefault();
                active.click();
            } else if (e.key === 'Escape') {
                dropdown.classList.remove('show');
            }
        });
    });
}

// Run on initial page load
document.addEventListener('DOMContentLoaded', initApp);

// Re-init after HTMX swaps
document.addEventListener('htmx:afterSettle', initApp);