/**
 * ssid.js — SSID Configuration Page
 * 
 * Manages WiFi SSID list and WiFi connection settings (static/DHCP).
 * IP fields use shared octet-split component.
 */

import { state, bindIpGroup, bindRadio } from '../state.js';
import { escapeHtml } from '../utils.js';
import { isValidIP, isValidCountryCode, normalizeCountryCode } from '../validator.js';
import { renderIpOctets, setupIpOctets, collectIpValue } from '../components/ip-input.js';
import { DEFAULTS } from '../constants.js';
import { COUNTRY_CODES, CONTINENT_GROUPS, FREQUENT_COUNTRY_CODES } from '../country-codes.js';

const MAX_SSID_COUNT = 10;

/**
 * Build the grouped <optgroup>/<option> markup for the Country Code <select>:
 * a pinned "Frequently used" group above five continent groups (205 codes).
 * `selected` is the current stored code; if it is not a recognized code (an
 * empty value, or a stale "EU" from the old free-text field), the dropdown
 * falls back to the AE default. The `selected` attribute is applied to the
 * first occurrence only, so exactly one option is selected.
 */
function renderCountryOptions(selected) {
    const want = (selected || DEFAULTS.WIFI_COUNTRY_CODE).toUpperCase();
    const sel = COUNTRY_CODES[want] ? want : DEFAULTS.WIFI_COUNTRY_CODE;
    let selPlaced = false;

    const option = (code) => {
        const isSel = !selPlaced && code === sel;
        if (isSel) selPlaced = true;
        return `<option value="${code}"${isSel ? ' selected' : ''}>` +
               `${escapeHtml(code + ' — ' + COUNTRY_CODES[code])}</option>`;
    };
    const group = (label, codes) =>
        `<optgroup label="${escapeHtml(label)}">` +
        codes.map(option).join('') +
        `</optgroup>`;

    let html = group('Frequently used', FREQUENT_COUNTRY_CODES);
    html += CONTINENT_GROUPS.map(g => group(g.region, g.codes)).join('');
    return html;
}

export function renderSsidPage(container) {
    const device = state.device || {};
    const wifi = device.wifi || {};
    const ssidList = device.ssid_list || [];

    container.innerHTML = `
        <div class="page-header">
            <h1 class="page-header__title">📶 WiFi SSID Management</h1>
            <p class="page-header__desc">Manage WiFi network list and connection settings.</p>
        </div>

        <!-- SSID List -->
        <div class="card">
            <div class="card__header">
                <h2 class="card__title"><span class="card__title-icon">📡</span> SSID List</h2>
                <button class="btn btn--outline btn--sm" id="ssid-add-btn">＋ Add</button>
            </div>
            <div class="data-table-wrapper">
                <table class="data-table" id="ssid-table">
                    <thead>
                        <tr>
                            <th>SSID Name</th>
                            <th>Password</th>
                            <th>Security</th>
                            <th class="col-action"></th>
                        </tr>
                    </thead>
                    <tbody id="ssid-tbody"></tbody>
                </table>
            </div>
            <p class="form-hint mt-sm">Up to 10 SSIDs can be registered.</p>
        </div>

        <!-- WiFi Connection Settings -->
        <div class="card">
            <div class="card__header">
                <h2 class="card__title"><span class="card__title-icon">🔧</span> WiFi Connection Settings</h2>
            </div>

            <div class="form-group">
                <label class="form-label">Connection Type</label>
                <div class="radio-group">
                    <label class="radio-label">
                        <input type="radio" name="wifi_type" value="static" ${wifi.type !== 'dhcp' ? 'checked' : ''}>
                        Static
                    </label>
                    <label class="radio-label">
                        <input type="radio" name="wifi_type" value="dhcp" ${wifi.type === 'dhcp' ? 'checked' : ''}>
                        DHCP
                    </label>
                </div>
            </div>

            <div id="wifi-static-fields">
                <div class="form-row">
                    <div class="form-group">
                        <label class="form-label">IP Address</label>
                        ${renderIpOctets('wifi_ip', wifi.ip)}
                    </div>
                    <div class="form-group">
                        <label class="form-label">Subnet Mask</label>
                        ${renderIpOctets('wifi_netmask', wifi.netmask)}
                    </div>
                </div>
                <div class="form-row">
                    <div class="form-group">
                        <label class="form-label">Gateway</label>
                        ${renderIpOctets('wifi_gateway', wifi.gateway)}
                    </div>
                    <div class="form-group">
                        <label class="form-label">DNS 1</label>
                        ${renderIpOctets('wifi_dns1', wifi.dns1)}
                    </div>
                </div>
                <div class="form-row">
                    <div class="form-group">
                        <label class="form-label">DNS 2</label>
                        ${renderIpOctets('wifi_dns2', wifi.dns2)}
                    </div>
                    <div class="form-group"></div>
                </div>
            </div>
        </div>
    `;

    // Setup IP octet event listeners
    setupIpOctets(container);

    // Populate SSID rows
    const tbody = document.getElementById('ssid-tbody');
    ssidList.forEach((s, i) => addSsidRow(tbody, s, i));

    // Add SSID button (max 10 rows)
    const addBtn = document.getElementById('ssid-add-btn');
    addBtn.addEventListener('click', () => {
        if (tbody.querySelectorAll('tr').length >= MAX_SSID_COUNT) return;
        addSsidRow(tbody, { ssid: '', password: '', security: 'wpa/wpa2' }, ssidList.length);
        updateSsidAddButton();
    });
    updateSsidAddButton();

    // Static/DHCP toggle
    document.querySelectorAll('input[name="wifi_type"]').forEach(radio => {
        radio.addEventListener('change', () => toggleStaticFields());
    });
    toggleStaticFields();

    // Register data collector
    window.__pageCollectors.ssid = collectSsidData;
}

function addSsidRow(tbody, data, index) {
    const tr = document.createElement('tr');
    tr.innerHTML = `
        <td><input class="form-input" data-field="ssid" value="${escapeHtml(data.ssid)}" placeholder="SSID Name"></td>
        <td>
            <div class="input-password">
                <input class="form-input" type="password" data-field="password" value="${escapeHtml(data.password)}" placeholder="Password">
                <button class="input-password__toggle" type="button" title="Show password">👁</button>
            </div>
        </td>
        <td>
            <select class="form-select" data-field="security">
                <option value="wpa/wpa2" ${data.security === 'wpa/wpa2' || data.security === 'WPA' ? 'selected' : ''}>WPA/WPA2</option>
                <option value="WEP" ${data.security === 'WEP' ? 'selected' : ''}>WEP</option>
                <option value="Open" ${data.security === 'Open' ? 'selected' : ''}>Open</option>
            </select>
        </td>
        <td class="col-action">
            <button class="btn btn--ghost btn--icon ssid-delete" title="Delete">🗑</button>
        </td>
    `;

    // Toggle password visibility
    tr.querySelector('.input-password__toggle').addEventListener('click', (e) => {
        const input = tr.querySelector('input[data-field="password"]');
        input.type = input.type === 'password' ? 'text' : 'password';
        e.target.textContent = input.type === 'password' ? '👁' : '🔒';
    });

    // Delete row
    tr.querySelector('.ssid-delete').addEventListener('click', () => {
        tr.remove();
        updateSsidAddButton();
    });

    tbody.appendChild(tr);
}

function updateSsidAddButton() {
    const btn = document.getElementById('ssid-add-btn');
    const count = document.querySelectorAll('#ssid-tbody tr').length;
    if (btn) btn.disabled = count >= MAX_SSID_COUNT;
}

function toggleStaticFields() {
    const isDhcp = document.querySelector('input[name="wifi_type"]:checked')?.value === 'dhcp';
    const fields = document.getElementById('wifi-static-fields');
    if (!fields) return;
    fields.querySelectorAll('.form-input').forEach(input => {
        input.disabled = isDhcp;
    });
    fields.style.opacity = isDhcp ? '0.5' : '1';
}

function collectSsidData() {
    if (!state.device) state.device = {};

    // WiFi settings — collect from octet groups.
    // country_code MUST be re-collected here: this object replaces state.device.wifi
    // wholesale, so omitting it would silently drop the legacy Java value on save.
    const wifiType = document.querySelector('input[name="wifi_type"]:checked')?.value || 'static';
    const ccEl = document.getElementById('wifi_country_code');
    const countryCode = normalizeCountryCode(
        ccEl ? ccEl.value : (state.device.wifi && state.device.wifi.country_code)
    ) || DEFAULTS.WIFI_COUNTRY_CODE;
    state.device.wifi = {
        type: wifiType,
        ip: collectIpValue('wifi_ip'),
        netmask: collectIpValue('wifi_netmask'),
        gateway: collectIpValue('wifi_gateway'),
        dns1: collectIpValue('wifi_dns1'),
        dns2: collectIpValue('wifi_dns2'),
        country_code: countryCode,
    };

    // SSID list
    const rows = document.querySelectorAll('#ssid-tbody tr');
    state.device.ssid_list = Array.from(rows).map(tr => ({
        ssid: tr.querySelector('[data-field="ssid"]')?.value || '',
        password: tr.querySelector('[data-field="password"]')?.value || '',
        security: tr.querySelector('[data-field="security"]')?.value || 'wpa/wpa2',
    }));
}

// ─── WiFi IP fields ─────────────────────────────────────────
const WIFI_IP_FIELDS = ['wifi_ip', 'wifi_netmask', 'wifi_gateway', 'wifi_dns1', 'wifi_dns2'];
const WIFI_IP_LABELS = {
    wifi_ip: 'WiFi IP', wifi_netmask: 'WiFi Subnet Mask', wifi_gateway: 'WiFi Gateway',
    wifi_dns1: 'WiFi DNS 1', wifi_dns2: 'WiFi DNS 2',
};
const WIFI_STATE_KEYS = { wifi_ip: 'ip', wifi_netmask: 'netmask', wifi_gateway: 'gateway', wifi_dns1: 'dns1', wifi_dns2: 'dns2' };

// ─── New Page Interface ─────────────────────────────────────
const ssidPage = {
    render(container) {
        const device = state.device || {};
        const wifi = device.wifi || {};
        const ssidList = device.ssid_list || [];

        container.innerHTML = `
            <div class="page-header">
                <h1 class="page-header__title">📶 WiFi SSID Management</h1>
                <p class="page-header__desc">Manage WiFi network list and connection settings.</p>
            </div>

            <div class="card">
                <div class="card__header">
                    <h2 class="card__title"><span class="card__title-icon">📡</span> SSID List</h2>
                    <button class="btn btn--outline btn--sm" id="ssid-add-btn">＋ Add</button>
                </div>
                <div class="data-table-wrapper">
                    <table class="data-table" id="ssid-table">
                        <thead>
                            <tr>
                                <th>SSID Name</th>
                                <th>Password</th>
                                <th>Security</th>
                                <th class="col-action"></th>
                            </tr>
                        </thead>
                        <tbody id="ssid-tbody"></tbody>
                    </table>
                </div>
                <p class="form-hint mt-sm">Up to 10 SSIDs can be registered.</p>
            </div>

            <div class="card">
                <div class="card__header">
                    <h2 class="card__title"><span class="card__title-icon">🔧</span> WiFi Connection Settings</h2>
                </div>
                <div class="form-group">
                    <label class="form-label">Connection Type</label>
                    <div class="radio-group">
                        <label class="radio-label">
                            <input type="radio" name="wifi_type" value="static" ${wifi.type !== 'dhcp' ? 'checked' : ''}>
                            Static
                        </label>
                        <label class="radio-label">
                            <input type="radio" name="wifi_type" value="dhcp" ${wifi.type === 'dhcp' ? 'checked' : ''}>
                            DHCP
                        </label>
                    </div>
                </div>
                <div id="wifi-static-fields">
                    <div class="form-row">
                        <div class="form-group">
                            <label class="form-label">IP Address</label>
                            ${renderIpOctets('wifi_ip', wifi.ip)}
                        </div>
                        <div class="form-group">
                            <label class="form-label">Subnet Mask</label>
                            ${renderIpOctets('wifi_netmask', wifi.netmask)}
                        </div>
                    </div>
                    <div class="form-row">
                        <div class="form-group">
                            <label class="form-label">Gateway</label>
                            ${renderIpOctets('wifi_gateway', wifi.gateway)}
                        </div>
                        <div class="form-group">
                            <label class="form-label">DNS 1</label>
                            ${renderIpOctets('wifi_dns1', wifi.dns1)}
                        </div>
                    </div>
                    <div class="form-row">
                        <div class="form-group">
                            <label class="form-label">DNS 2</label>
                            ${renderIpOctets('wifi_dns2', wifi.dns2)}
                        </div>
                        <div class="form-group"></div>
                    </div>
                </div>
            </div>

            <div class="card">
                <div class="card__header">
                    <h2 class="card__title"><span class="card__title-icon">🌍</span> Region</h2>
                </div>
                <div class="form-group">
                    <label class="form-label" for="wifi_country_code">Country Code</label>
                    <select class="form-input" id="wifi_country_code" style="max-width: 300px;">
                        ${renderCountryOptions(wifi.country_code || DEFAULTS.WIFI_COUNTRY_CODE)}
                    </select>
                    <p class="form-hint">WiFi regulatory region. Defaults to AE (United Arab Emirates); dpworldapp applies it to the WiFi module.</p>
                </div>
            </div>
        `;
    },

    mount(container) {
        setupIpOctets(container);

        // Reactive bindings: WiFi type radio
        bindRadio(container, 'wifi_type',
            () => (state.device?.wifi?.type || 'static'),
            (val) => {
                if (!state.device) state.device = {};
                if (!state.device.wifi) state.device.wifi = {};
                state.device.wifi.type = val;
                state.isDirty = true;
            }
        );

        // Reactive bindings: WiFi IP groups
        WIFI_IP_FIELDS.forEach(ipKey => {
            const stateKey = WIFI_STATE_KEYS[ipKey];
            bindIpGroup(container, ipKey,
                () => state.device?.wifi?.[stateKey] || '',
                (val) => {
                    if (!state.device) state.device = {};
                    if (!state.device.wifi) state.device.wifi = {};
                    state.device.wifi[stateKey] = val;
                    state.isDirty = true;
                }
            );
        });

        // Reactive binding: WiFi country code (<select>)
        const ccEl = container.querySelector('#wifi_country_code');
        if (ccEl) {
            ccEl.addEventListener('change', () => {
                if (!state.device) state.device = {};
                if (!state.device.wifi) state.device.wifi = {};
                state.device.wifi.country_code = ccEl.value;
                state.isDirty = true;
            });
        }

        // SSID list: populate + event delegation
        const tbody = container.querySelector('#ssid-tbody');
        const ssidList = state.device?.ssid_list || [];
        ssidList.forEach((s, i) => addSsidRow(tbody, s, i));

        // SSID list: reactive sync on input/change/delete
        tbody.addEventListener('input', () => { this._syncSsidList(tbody); });
        tbody.addEventListener('change', () => { this._syncSsidList(tbody); });
        // Sync after row deletion (DOM mutation via click on delete button)
        tbody.addEventListener('click', (e) => {
            if (e.target.closest('.ssid-delete')) {
                // Delay to let the row be removed first
                setTimeout(() => { this._syncSsidList(tbody); updateSsidAddButton(); }, 0);
            }
        });

        // Add button
        const addBtn = container.querySelector('#ssid-add-btn');
        addBtn.addEventListener('click', () => {
            if (tbody.querySelectorAll('tr').length >= MAX_SSID_COUNT) return;
            addSsidRow(tbody, { ssid: '', password: '', security: 'wpa/wpa2' }, tbody.querySelectorAll('tr').length);
            this._syncSsidList(tbody);
            updateSsidAddButton();
        });
        updateSsidAddButton();

        // Static/DHCP toggle
        container.querySelectorAll('input[name="wifi_type"]').forEach(radio => {
            radio.addEventListener('change', () => toggleStaticFields());
        });
        toggleStaticFields();

        // Legacy collector (R4)
        window.__pageCollectors.ssid = collectSsidData;
    },

    _syncSsidList(tbody) {
        if (!state.device) state.device = {};
        const rows = tbody.querySelectorAll('tr');
        state.device.ssid_list = Array.from(rows).map(tr => ({
            ssid: tr.querySelector('[data-field="ssid"]')?.value || '',
            password: tr.querySelector('[data-field="password"]')?.value || '',
            security: tr.querySelector('[data-field="security"]')?.value || 'wpa/wpa2',
        }));
        state.isDirty = true;
    },

    destroy() {},

    validate() {
        const errors = [];
        const wifi = state.device?.wifi || {};
        // Only validate IP fields when static mode
        if (wifi.type !== 'dhcp') {
            WIFI_IP_FIELDS.forEach(ipKey => {
                const stateKey = WIFI_STATE_KEYS[ipKey];
                const val = wifi[stateKey];
                if (val && val !== '...' && !isValidIP(val)) {
                    errors.push({ field: ipKey, page: 'ssid', message: `${WIFI_IP_LABELS[ipKey]} — Invalid IP format` });
                }
            });
        }
        // Region — WiFi country code: required, exactly 2 uppercase letters
        if (!isValidCountryCode(normalizeCountryCode(wifi.country_code))) {
            errors.push({
                field: 'wifi_country_code', page: 'ssid',
                message: 'Country Code — must be a 2-letter ISO 3166-1 alpha-2 code (e.g. KR, US, DE, JP, AE)',
            });
        }
        return errors;
    },
};

export default ssidPage;