// ── Notification banner system ──
// Providers register via addProvider(fn). Each fn(settings) returns an array of items.

import { $, esc } from './util.js';

const banner = $('upcoming-banner');
const providers = [];
const DISMISS_KEY = 'hyprcrd-dismissed-notifs';
const DISMISS_DATE_KEY = 'hyprcrd-dismissed-date';
const SETTINGS_KEY = 'hyprcrd-notif-settings';

// Clear dismissed list daily
if (localStorage.getItem(DISMISS_DATE_KEY) !== new Date().toISOString().substring(0, 10)) {
    localStorage.removeItem(DISMISS_KEY);
    localStorage.setItem(DISMISS_DATE_KEY, new Date().toISOString().substring(0, 10));
}

function getDismissed() {
    try { return JSON.parse(localStorage.getItem(DISMISS_KEY) || '[]'); } catch { return []; }
}

function dismiss(id) {
    const d = getDismissed();
    if (!d.includes(id)) d.push(id);
    localStorage.setItem(DISMISS_KEY, JSON.stringify(d));
    render();
}

export function getSettings() {
    const defaults = { lookahead: 3, time: 0, birthdays: true, termine: true, overdue: true };
    try { return { ...defaults, ...JSON.parse(localStorage.getItem(SETTINGS_KEY) || '{}') }; } catch { return defaults; }
}

export function saveSettings(s) {
    localStorage.setItem(SETTINGS_KEY, JSON.stringify(s));
    render();
}

/**
 * Register a notification provider.
 * @param {function} fn - Receives settings, returns array of { id, icon, iconColor, label, when, sort, onClick?, dismissable?, type? }
 */
export function addProvider(fn) {
    providers.push(fn);
}

function getAllItems() {
    const settings = getSettings();
    const items = [];
    for (const fn of providers) {
        try {
            const result = fn(settings);
            if (Array.isArray(result)) items.push(...result);
        } catch {}
    }
    items.sort((a, b) => (a.sort || '').localeCompare(b.sort || ''));
    return items;
}

export function render() {
    if (!banner) return;
    const dismissed = getDismissed();
    const visible = getAllItems().filter(i => !dismissed.includes(String(i.id)));

    if (!visible.length) { banner.classList.add('hidden'); banner.innerHTML = ''; return; }

    banner.classList.remove('hidden');
    banner.innerHTML = `<div class="flex items-center gap-2 px-6 py-2 bg-t-raised border-b border-t-border overflow-x-auto">
        <i class="ph ph-bell-ringing text-t-accent text-sm shrink-0"></i>
        ${visible.map(i => `<div class="upcoming-item" data-notif-id="${i.id}" style="color:${i.iconColor || 'var(--t-text)'}">
            <i class="ph ph-${i.icon || 'info'}" style="font-size:11px;"></i>
            ${i.when ? `<span class="font-pixel text-[10px]">${esc(i.when)}</span>` : ''}
            <span>${esc(i.label)}</span>
            ${i.dismissable !== false ? `<button class="upcoming-dismiss" data-dismiss="${i.id}"><i class="ph ph-x text-xs"></i></button>` : ''}
        </div>`).join('')}
        <button id="dismiss-all" class="shrink-0 ml-auto text-t-dim hover:text-t-danger transition-colors" title="dismiss all"><i class="ph ph-x-circle text-sm"></i></button>
    </div>`;

    banner.querySelectorAll('[data-notif-id]').forEach(el => {
        el.addEventListener('click', e => {
            if (e.target.closest('.upcoming-dismiss')) return;
            const item = visible.find(i => String(i.id) === el.dataset.notifId);
            if (item?.onClick) item.onClick();
        });
    });
    banner.querySelectorAll('.upcoming-dismiss').forEach(btn => {
        btn.addEventListener('click', e => {
            e.stopPropagation();
            dismiss(btn.dataset.dismiss);
        });
    });
    banner.querySelector('#dismiss-all')?.addEventListener('click', e => {
        e.stopPropagation();
        for (const i of visible) dismiss(String(i.id));
    });
}

// ── Settings panel integration ──

export function renderSettingsPanel() {
    const s = getSettings();

    // Populate controls
    const lookahead = $('notif-lookahead');
    if (lookahead) lookahead.value = String(s.lookahead);
    const time = $('notif-time');
    if (time) time.value = String(s.time);
    const cbBday = $('notif-birthdays');
    if (cbBday) cbBday.checked = s.birthdays;
    const cbTermin = $('notif-termine');
    if (cbTermin) cbTermin.checked = s.termine;
    const cbOverdue = $('notif-overdue');
    if (cbOverdue) cbOverdue.checked = s.overdue;

    // Auto-save on change (use onchange to avoid stacking listeners)
    const save = () => saveSettings({
        lookahead: parseInt(lookahead?.value || '3'),
        time: parseInt(time?.value || '0'),
        birthdays: cbBday?.checked ?? true,
        termine: cbTermin?.checked ?? true,
        overdue: cbOverdue?.checked ?? true,
    });
    if (lookahead) lookahead.onchange = save;
    if (time) time.onchange = save;
    if (cbBday) cbBday.onchange = save;
    if (cbTermin) cbTermin.onchange = save;
    if (cbOverdue) cbOverdue.onchange = save;

    // Restore dismissed — replace element to avoid duplicate listeners
    const restoreBtn = $('notif-clear-dismissed');
    if (restoreBtn) {
        const fresh = restoreBtn.cloneNode(true);
        restoreBtn.parentNode.replaceChild(fresh, restoreBtn);
        fresh.addEventListener('click', () => {
            localStorage.removeItem(DISMISS_KEY);
            render();
            renderStream();
        });
    }

    renderStream();
}

function renderStream() {
    const stream = $('notif-stream');
    if (!stream) return;
    const dismissed = getDismissed();
    const all = getAllItems();

    if (!all.length) {
        stream.innerHTML = '<div class="text-xs text-t-dim font-pixel text-center py-4">no notifications</div>';
        return;
    }

    stream.innerHTML = all.map(i => {
        const isDismissed = dismissed.includes(String(i.id));
        return `<div class="flex items-center gap-2 px-2 py-1.5 rounded text-xs ${isDismissed ? 'opacity-40' : ''}" style="color:${i.iconColor || 'var(--t-text)'}">
            <i class="ph ph-${i.icon || 'info'}" style="font-size:11px;flex-shrink:0;"></i>
            ${i.when ? `<span class="font-pixel text-[9px] text-t-dim" style="min-width:55px;">${esc(i.when)}</span>` : ''}
            <span class="flex-1 truncate">${esc(i.label)}</span>
            ${isDismissed ? '<span class="font-pixel text-[8px] text-t-dim">dismissed</span>' : ''}
        </div>`;
    }).join('');
}