/* ─────────────────────────────────────────────
   Notification Preferences (v0.20.0 Phase 3)
   Settings → Notifications tab
   ───────────────────────────────────────────── */

// eslint-disable-next-line no-unused-vars
//
// Exports: window.NotifPrefs

const NotifPrefs = {
    _loaded: false,
    _prefs: [],

    // Known notification types for the UI
    _types: [
        { key: 'kb.ready',       label: 'Knowledge base ready' },
        { key: 'kb.error',       label: 'Knowledge base error' },
        { key: 'role.fallback',  label: 'Model fallback' },
        { key: 'grant.changed',  label: 'Group membership change' },
        { key: '*',              label: 'Default (all others)' },
    ],

    async load() {
        try {
            this._prefs = await API.listNotifPrefs() || [];
        } catch (e) {
            console.warn('[notif-prefs] failed to load:', e.message);
            this._prefs = [];
        }
        this._loaded = true;
        this.render();
    },

    render() {
        const container = document.getElementById('notifPrefsBody');
        if (!container) return;

        const prefMap = {};
        for (const p of this._prefs) {
            prefMap[p.type] = p;
        }

        let html = '';
        for (const t of this._types) {
            const p = prefMap[t.key];
            const inApp = p ? p.in_app : true;
            const email = p ? p.email : false;

            html += `<tr class="notif-pref-row" data-type="${esc(t.key)}">
                <td class="notif-pref-label">${esc(t.label)}</td>
                <td class="notif-pref-toggle">
                    <label class="checkbox-label">
                        <input type="checkbox" class="notif-pref-inapp" ${inApp ? 'checked' : ''}>
                    </label>
                </td>
                <td class="notif-pref-toggle">
                    <label class="checkbox-label">
                        <input type="checkbox" class="notif-pref-email" ${email ? 'checked' : ''}>
                    </label>
                </td>
            </tr>`;
        }

        container.innerHTML = `<table class="notif-pref-table">
            <thead><tr>
                <th>Notification Type</th>
                <th>In-App</th>
                <th>Email</th>
            </tr></thead>
            <tbody>${html}</tbody>
        </table>`;

        // Attach change listeners
        container.querySelectorAll('.notif-pref-row').forEach(row => {
            const type = row.dataset.type;
            row.querySelector('.notif-pref-inapp').addEventListener('change', (e) => {
                this._save(type, { in_app: e.target.checked });
            });
            row.querySelector('.notif-pref-email').addEventListener('change', (e) => {
                this._save(type, { email: e.target.checked });
            });
        });
    },

    async _save(type, patch) {
        try {
            await API.setNotifPref(type, patch);
            // Update cache
            const existing = this._prefs.find(p => p.type === type);
            if (existing) {
                Object.assign(existing, patch);
            } else {
                this._prefs.push({ type, in_app: true, email: false, ...patch });
            }
        } catch (e) {
            UI.toast('Failed to save preference', 'error');
            this.render(); // revert checkboxes
        }
    },
};

// ── Admin SMTP UI helpers ───────────────────

// Called from index.html onclick
// eslint-disable-next-line no-unused-vars
NotifPrefs._testEmail = async function() {
    const status = document.getElementById('smtpTestStatus');
    const btn = document.getElementById('adminSmtpTestBtn');
    if (!status || !btn) return;

    btn.disabled = true;
    status.textContent = 'Sending…';
    status.className = 'smtp-test-status';

    try {
        const result = await API.adminTestEmail();
        status.textContent = `✓ Sent to ${result.sent_to}`;
        status.className = 'smtp-test-status success';
    } catch (e) {
        status.textContent = '✗ ' + (e.message || 'Failed');
        status.className = 'smtp-test-status error';
    } finally {
        btn.disabled = false;
    }
};

NotifPrefs._initAdminSmtp = function() {
    const toggle = document.getElementById('adminEmailEnabled');
    const fields = document.getElementById('smtpConfigFields');
    if (!toggle || !fields) return;
    toggle.addEventListener('change', () => {
        fields.style.display = toggle.checked ? '' : 'none';
    });
};

NotifPrefs._loadAdminSmtp = function(cfg) {
    if (!cfg) return;
    const el = (id) => document.getElementById(id);
    if (cfg.email_enabled) el('adminEmailEnabled').checked = true;
    if (cfg.smtp_host) el('adminSmtpHost').value = cfg.smtp_host;
    if (cfg.smtp_port) el('adminSmtpPort').value = cfg.smtp_port;
    if (cfg.smtp_user) el('adminSmtpUser').value = cfg.smtp_user;
    // Don't populate password (security)
    if (cfg.smtp_from) el('adminSmtpFrom').value = cfg.smtp_from;
    if (cfg.smtp_tls != null) el('adminSmtpTls').value = String(cfg.smtp_tls);

    // Show/hide SMTP fields
    const fields = document.getElementById('smtpConfigFields');
    if (fields) fields.style.display = cfg.email_enabled ? '' : 'none';
};

NotifPrefs._getAdminSmtp = function() {
    const el = (id) => document.getElementById(id);
    const config = {
        email_enabled: el('adminEmailEnabled')?.checked || false,
        smtp_host: el('adminSmtpHost')?.value?.trim() || '',
        smtp_port: parseInt(el('adminSmtpPort')?.value) || 587,
        smtp_user: el('adminSmtpUser')?.value?.trim() || '',
        smtp_from: el('adminSmtpFrom')?.value?.trim() || '',
        smtp_tls: el('adminSmtpTls')?.value === 'true',
    };
    // Only include password if user typed something new
    const pw = el('adminSmtpPassword')?.value;
    if (pw) config.smtp_password = pw;
    return config;
};

// ── Exports ─────────────────────────────────
sb.ns('NotifPrefs', NotifPrefs);