/* Atlus — Settings app */
(function () {
    'use strict';

    let container = null;
    let contentEl = null;
    let activeSection = 'general';

    const SECTIONS = [
        { id: 'general', label: 'General' },
        { id: 'network', label: 'Network' },
        { id: 'services', label: 'Services' },
        { id: 'about', label: 'About' },
    ];

    async function loadSection(section) {
        activeSection = section;
        // Update nav
        container.querySelectorAll('.settings-nav-item').forEach(item => {
            item.classList.toggle('active', item.dataset.section === section);
        });

        if (section === 'general') await renderGeneral();
        else if (section === 'network') await renderNetwork();
        else if (section === 'services') await renderServicesConfig();
        else if (section === 'about') await renderAbout();
    }

    async function renderGeneral() {
        const res = await Atlus.apiFetch('/api/settings');
        const cfg = await res.json();
        const sysRes = await Atlus.apiFetch('/api/settings/system');
        const sys = await sysRes.json();

        contentEl.innerHTML = `
            <div class="settings-section-title">General</div>

            <div class="settings-group">
                <div class="settings-group-title">SYSTEM</div>
                <div class="settings-row">
                    <div>
                        <div class="settings-row-label">Hostname</div>
                        <div class="settings-row-desc">System network name</div>
                    </div>
                    <input class="settings-input" id="setHostname" value="${sys.hostname}">
                </div>
                <div class="settings-row">
                    <div>
                        <div class="settings-row-label">Timezone</div>
                        <div class="settings-row-desc">System timezone</div>
                    </div>
                    <input class="settings-input" id="setTimezone" value="${cfg.timezone || 'System default'}" placeholder="e.g. America/New_York">
                </div>
            </div>

            <div class="settings-group">
                <div class="settings-group-title">DISPLAY</div>
                <div class="settings-row">
                    <div>
                        <div class="settings-row-label">Stats refresh interval</div>
                        <div class="settings-row-desc">Seconds between stat updates</div>
                    </div>
                    <input class="settings-input" id="setStatsInterval" type="number" min="1" max="30" value="${cfg.stats_interval_seconds || 2}" style="width:80px;">
                </div>
                <div class="settings-row">
                    <div>
                        <div class="settings-row-label">Session timeout</div>
                        <div class="settings-row-desc">Minutes before auto-logout</div>
                    </div>
                    <input class="settings-input" id="setSessionTimeout" type="number" min="5" max="10080" value="${cfg.session_timeout_minutes || 1440}" style="width:80px;">
                </div>
            </div>

            <div class="settings-actions">
                <button class="settings-btn" id="saveGeneral">Save</button>
            </div>
        `;

        contentEl.querySelector('#saveGeneral').addEventListener('click', async () => {
            const hostname = contentEl.querySelector('#setHostname').value.trim();
            const timezone = contentEl.querySelector('#setTimezone').value.trim();
            const interval = parseInt(contentEl.querySelector('#setStatsInterval').value);
            const timeout = parseInt(contentEl.querySelector('#setSessionTimeout').value);

            // Update hostname if changed
            if (hostname && hostname !== sys.hostname) {
                await Atlus.apiFetch('/api/settings/hostname', {
                    method: 'POST',
                    body: { hostname },
                });
            }

            // Update timezone if changed
            if (timezone && timezone !== 'System default') {
                await Atlus.apiFetch('/api/settings/timezone', {
                    method: 'POST',
                    body: { timezone },
                });
            }

            // Update config
            await Atlus.apiFetch('/api/settings', {
                method: 'PUT',
                body: {
                    stats_interval_seconds: interval,
                    session_timeout_minutes: timeout,
                    timezone: timezone === 'System default' ? null : timezone,
                },
            });

            alert('Settings saved.');
        });
    }

    async function renderNetwork() {
        const res = await Atlus.apiFetch('/api/stats');
        const data = await res.json();

        let html = '<div class="settings-section-title">Network</div>';
        const ifaces = data.network.interfaces;

        for (const [name, info] of Object.entries(ifaces)) {
            html += `
                <div class="settings-group">
                    <div class="settings-group-title">${name.toUpperCase()}</div>
                    <div class="settings-row">
                        <div class="settings-row-label">Status</div>
                        <span style="color:${info.up ? 'var(--status-green)' : 'var(--status-red)'};">${info.up ? 'Up' : 'Down'}</span>
                    </div>
                    <div class="settings-row">
                        <div class="settings-row-label">IPv4</div>
                        <span style="font-family:var(--font-mono);font-size:13px;">${info.ipv4 || '--'}</span>
                    </div>
                    <div class="settings-row">
                        <div class="settings-row-label">IPv6</div>
                        <span style="font-family:var(--font-mono);font-size:13px;">${info.ipv6 || '--'}</span>
                    </div>
                </div>
            `;
        }

        contentEl.innerHTML = html;
    }

    async function renderServicesConfig() {
        const cfgRes = await Atlus.apiFetch('/api/settings');
        const cfg = await cfgRes.json();
        const panelServices = cfg.panel_services || [];

        contentEl.innerHTML = `
            <div class="settings-section-title">Panel Services</div>
            <div class="settings-group">
                <div class="settings-group-title">PINNED TO RIGHT PANEL</div>
                <div class="settings-row-desc" style="margin-bottom:16px;">
                    Comma-separated list of systemd unit names to show in the right panel.
                </div>
                <textarea class="settings-input" id="setPanelServices" rows="4"
                    style="width:100%;height:100px;padding:12px;resize:vertical;"
                    placeholder="e.g. nginx.service, docker.service">${panelServices.join(', ')}</textarea>
            </div>
            <div class="settings-actions">
                <button class="settings-btn" id="saveServices">Save</button>
            </div>
        `;

        contentEl.querySelector('#saveServices').addEventListener('click', async () => {
            const raw = contentEl.querySelector('#setPanelServices').value;
            const units = raw.split(',').map(s => s.trim()).filter(Boolean);
            await Atlus.apiFetch('/api/settings', {
                method: 'PUT',
                body: { panel_services: units },
            });
            alert('Panel services updated.');
        });
    }

    async function renderAbout() {
        const res = await Atlus.apiFetch('/api/settings/system');
        const sys = await res.json();

        contentEl.innerHTML = `
            <div class="settings-section-title">About</div>
            <div class="settings-group">
                <div style="text-align:center;margin-bottom:32px;">
                    <div style="font-family:var(--font-mono);font-size:48px;font-weight:500;color:var(--accent);margin-bottom:8px;">A</div>
                    <div style="font-family:var(--font-mono);font-size:12px;color:var(--text-muted);letter-spacing:4px;">ATLUS v0.1.0</div>
                </div>
                <div class="settings-row">
                    <div class="settings-row-label">Hostname</div>
                    <span style="font-family:var(--font-mono);font-size:13px;">${sys.hostname}</span>
                </div>
                <div class="settings-row">
                    <div class="settings-row-label">Operating System</div>
                    <span style="font-family:var(--font-mono);font-size:13px;">${sys.os}</span>
                </div>
                <div class="settings-row">
                    <div class="settings-row-label">Kernel</div>
                    <span style="font-family:var(--font-mono);font-size:13px;">${sys.kernel}</span>
                </div>
                <div class="settings-row">
                    <div class="settings-row-label">Architecture</div>
                    <span style="font-family:var(--font-mono);font-size:13px;">${sys.arch}</span>
                </div>
                <div class="settings-row">
                    <div class="settings-row-label">Python</div>
                    <span style="font-family:var(--font-mono);font-size:13px;">${sys.python}</span>
                </div>
            </div>
            <div style="text-align:center;margin-top:32px;">
                <div style="color:var(--text-muted);font-size:12px;font-family:var(--font-mono);">
                    Licensed under GPL-3.0
                </div>
            </div>
        `;
    }

    Atlus.registerApp('settings', {
        title: 'Settings',

        init(el) {
            container = el;
            container.classList.add('app-settings');

            // Nav
            const nav = document.createElement('div');
            nav.className = 'settings-nav';
            SECTIONS.forEach(s => {
                const item = document.createElement('button');
                item.className = 'settings-nav-item' + (s.id === activeSection ? ' active' : '');
                item.dataset.section = s.id;
                item.textContent = s.label;
                item.addEventListener('click', () => loadSection(s.id));
                nav.appendChild(item);
            });
            container.appendChild(nav);

            // Content
            contentEl = document.createElement('div');
            contentEl.className = 'settings-content';
            container.appendChild(contentEl);

            loadSection(activeSection);
        },

        destroy() {
            container = null;
            contentEl = null;
            activeSection = 'general';
        },
    });
})();