/**
 * Device cards — settings modal, brightness, power, color.
 */

import {
    _deviceBrightnessCache, updateDeviceBrightness,
} from '../core/state.js';
import { API_BASE, getHeaders, fetchWithAuth, escapeHtml, isSerialDevice, isMockDevice, isMqttDevice, isWsDevice, isOpenrgbDevice } from '../core/api.js';
import { t } from '../core/i18n.js';
import { showToast, showConfirm } from '../core/ui.js';
import { Modal } from '../core/modal.js';
import { ICON_SETTINGS, ICON_STOP_PLAIN, ICON_LED, ICON_WEB, ICON_PLUG } from '../core/icons.js';
import { wrapCard } from '../core/card-colors.js';

class DeviceSettingsModal extends Modal {
    constructor() { super('device-settings-modal'); }

    deviceType = '';
    capabilities = [];

    snapshotValues() {
        return {
            name: this.$('settings-device-name').value,
            url: this._getUrl(),
            state_check_interval: this.$('settings-health-interval').value,
            auto_shutdown: this.$('settings-auto-shutdown').checked,
            led_count: this.$('settings-led-count').value,
            led_type: document.getElementById('settings-led-type')?.value || 'rgb',
            send_latency: document.getElementById('settings-send-latency')?.value || '0',
        };
    }

    _getUrl() {
        if (isMockDevice(this.deviceType)) {
            const deviceId = this.$('settings-device-id')?.value || '';
            return `mock://${deviceId}`;
        }
        if (isWsDevice(this.deviceType)) {
            const deviceId = this.$('settings-device-id')?.value || '';
            return `ws://${deviceId}`;
        }
        if (isSerialDevice(this.deviceType)) {
            return this.$('settings-serial-port').value;
        }
        return this.$('settings-device-url').value.trim();
    }
}

const settingsModal = new DeviceSettingsModal();

export function createDeviceCard(device) {
    const state = device.state || {};

    const devOnline = state.device_online || false;
    const devLatency = state.device_latency_ms;
    const devName = state.device_name;
    const devVersion = state.device_version;
    const devLastChecked = state.device_last_checked;

    let healthClass, healthTitle, healthLabel;
    if (devLastChecked === null || devLastChecked === undefined) {
        healthClass = 'health-unknown';
        healthTitle = t('device.health.checking');
        healthLabel = '';
    } else if (devOnline) {
        healthClass = 'health-online';
        healthTitle = `${t('device.health.online')}`;
        if (devName) healthTitle += ` - ${devName}`;
        if (devVersion) healthTitle += ` v${devVersion}`;
        if (devLatency !== null && devLatency !== undefined) healthTitle += ` (${Math.round(devLatency)}ms)`;
        healthLabel = '';
    } else {
        healthClass = 'health-offline';
        healthTitle = t('device.health.offline');
        if (state.device_error) healthTitle += `: ${state.device_error}`;
        healthLabel = '';
    }

    const ledCount = state.device_led_count || device.led_count;

    return wrapCard({
        dataAttr: 'data-device-id',
        id: device.id,
        topButtons: (device.capabilities || []).includes('power_control') ? `<button class="card-top-btn card-power-btn" onclick="turnOffDevice('${device.id}')" title="${t('device.button.power_off')}">${ICON_STOP_PLAIN}</button>` : '',
        removeOnclick: `removeDevice('${device.id}')`,
        removeTitle: t('device.button.remove'),
        content: `
            <div class="card-header">
                <div class="card-title">
                    <span class="health-dot ${healthClass}" title="${healthTitle}"></span>
                    ${device.name || device.id}
                    ${device.url && device.url.startsWith('http') ? `<a class="device-url-badge" href="${device.url}" target="_blank" rel="noopener" title="${t('device.button.webui')}"><span class="device-url-text">${escapeHtml(device.url.replace(/^https?:\/\//, ''))}</span><span class="device-url-icon">${ICON_WEB}</span></a>` : (device.url && !device.url.startsWith('mock://') && !device.url.startsWith('ws://') && !device.url.startsWith('http') ? `<span class="device-url-badge"><span class="device-url-text">${escapeHtml(device.url)}</span></span>` : '')}
                    ${healthLabel}
                </div>
            </div>
            <div class="card-subtitle">
                <span class="card-meta device-type-badge">${(device.device_type || 'wled').toUpperCase()}</span>
                ${ledCount ? `<span class="card-meta" title="${t('device.led_count')}">${ICON_LED} ${ledCount}</span>` : ''}
                ${state.device_led_type ? `<span class="card-meta">${ICON_PLUG} ${state.device_led_type.replace(/ RGBW$/, '')}</span>` : ''}
                <span class="card-meta" title="${state.device_rgbw ? 'RGBW' : 'RGB'}"><span class="channel-indicator"><span class="ch" style="background:#e53935"></span><span class="ch" style="background:#43a047"></span><span class="ch" style="background:#1e88e5"></span>${state.device_rgbw ? '<span class="ch" style="background:#eee"></span>' : ''}</span></span>
            </div>
            ${(device.capabilities || []).includes('brightness_control') ? `
            <div class="brightness-control${_deviceBrightnessCache[device.id] == null ? ' brightness-loading' : ''}" data-brightness-wrap="${device.id}">
                <input type="range" class="brightness-slider" min="0" max="255"
                       value="${_deviceBrightnessCache[device.id] ?? 0}" data-device-brightness="${device.id}"
                       oninput="updateBrightnessLabel('${device.id}', this.value)"
                       onchange="saveCardBrightness('${device.id}', this.value)"
                       title="${_deviceBrightnessCache[device.id] != null ? Math.round(_deviceBrightnessCache[device.id] / 255 * 100) + '%' : '...'}"
                       ${_deviceBrightnessCache[device.id] == null ? 'disabled' : ''}>
            </div>` : ''}`,
        actions: `
            <button class="btn btn-icon btn-secondary" onclick="showSettings('${device.id}')" title="${t('device.button.settings')}">
                ${ICON_SETTINGS}
            </button>`,
    });
}

export async function turnOffDevice(deviceId) {
    try {
        const setResp = await fetchWithAuth(`/devices/${deviceId}/power`, {
            method: 'PUT',
            body: JSON.stringify({ on: false })
        });
        if (setResp.ok) {
            showToast(t('device.power.off_success'), 'success');
        } else {
            const error = await setResp.json();
            showToast(error.detail || 'Failed', 'error');
        }
    } catch (error) {
        if (error.isAuth) return;
        showToast(t('device.error.power_off_failed'), 'error');
    }
}

export function attachDeviceListeners(deviceId) {
    // Add any specific event listeners here if needed
}

export async function removeDevice(deviceId) {
    const confirmed = await showConfirm(t('device.remove.confirm'));
    if (!confirmed) return;

    try {
        const response = await fetchWithAuth(`/devices/${deviceId}`, {
            method: 'DELETE',
        });
        if (response.ok) {
            showToast(t('device.removed'), 'success');
            window.loadDevices();
        } else {
            const error = await response.json();
            showToast(error.detail || t('device.error.remove_failed'), 'error');
        }
    } catch (error) {
        if (error.isAuth) return;
        console.error('Failed to remove device:', error);
        showToast(t('device.error.remove_failed'), 'error');
    }
}

export async function showSettings(deviceId) {
    try {
        const deviceResponse = await fetchWithAuth(`/devices/${deviceId}`);
        if (!deviceResponse.ok) { showToast(t('device.error.settings_load_failed'), 'error'); return; }

        const device = await deviceResponse.json();
        const isAdalight = isSerialDevice(device.device_type);
        const caps = device.capabilities || [];

        // Set modal state before populating fields (so async helpers read correct type)
        settingsModal.deviceType = device.device_type;
        settingsModal.capabilities = caps;

        document.getElementById('settings-device-id').value = device.id;
        document.getElementById('settings-device-name').value = device.name;
        document.getElementById('settings-health-interval').value = device.state_check_interval ?? 30;

        const isMock = isMockDevice(device.device_type);
        const isWs = isWsDevice(device.device_type);
        const isMqtt = isMqttDevice(device.device_type);
        const urlGroup = document.getElementById('settings-url-group');
        const serialGroup = document.getElementById('settings-serial-port-group');
        const urlLabel = urlGroup.querySelector('label[for="settings-device-url"]');
        const urlHint = urlGroup.querySelector('.input-hint');
        const urlInput = document.getElementById('settings-device-url');
        if (isMock || isWs) {
            urlGroup.style.display = 'none';
            urlInput.removeAttribute('required');
            serialGroup.style.display = 'none';
        } else if (isAdalight) {
            urlGroup.style.display = 'none';
            urlInput.removeAttribute('required');
            serialGroup.style.display = '';
            _populateSettingsSerialPorts(device.url);
        } else {
            urlGroup.style.display = '';
            urlInput.setAttribute('required', '');
            urlInput.value = device.url;
            serialGroup.style.display = 'none';
            // Relabel for MQTT
            if (isMqtt) {
                if (urlLabel) urlLabel.textContent = t('device.mqtt_topic');
                if (urlHint) urlHint.textContent = t('device.mqtt_topic.hint');
                urlInput.placeholder = t('device.mqtt_topic.placeholder') || 'mqtt://ledgrab/device/living-room';
            } else if (isOpenrgbDevice(device.device_type)) {
                if (urlLabel) urlLabel.textContent = t('device.openrgb.url');
                if (urlHint) urlHint.textContent = t('device.openrgb.url.hint');
                urlInput.placeholder = 'openrgb://localhost:6742/0';
            } else {
                if (urlLabel) urlLabel.textContent = t('device.url');
                if (urlHint) urlHint.textContent = t('settings.url.hint');
                urlInput.placeholder = t('device.url.placeholder') || 'http://192.168.1.100';
            }
        }

        const ledCountGroup = document.getElementById('settings-led-count-group');
        if (caps.includes('manual_led_count')) {
            ledCountGroup.style.display = '';
            document.getElementById('settings-led-count').value = device.led_count || '';
        } else {
            ledCountGroup.style.display = 'none';
        }

        const baudRateGroup = document.getElementById('settings-baud-rate-group');
        if (isAdalight) {
            baudRateGroup.style.display = '';
            const baudSelect = document.getElementById('settings-baud-rate');
            if (device.baud_rate) {
                baudSelect.value = String(device.baud_rate);
            } else {
                baudSelect.value = '115200';
            }
            updateSettingsBaudFpsHint();
        } else {
            baudRateGroup.style.display = 'none';
        }

        // Mock-specific fields
        const ledTypeGroup = document.getElementById('settings-led-type-group');
        const sendLatencyGroup = document.getElementById('settings-send-latency-group');
        if (isMock) {
            if (ledTypeGroup) {
                ledTypeGroup.style.display = '';
                document.getElementById('settings-led-type').value = device.rgbw ? 'rgbw' : 'rgb';
            }
            if (sendLatencyGroup) {
                sendLatencyGroup.style.display = '';
                document.getElementById('settings-send-latency').value = device.send_latency_ms || 0;
            }
        } else {
            if (ledTypeGroup) ledTypeGroup.style.display = 'none';
            if (sendLatencyGroup) sendLatencyGroup.style.display = 'none';
        }

        // WS connection URL
        const wsUrlGroup = document.getElementById('settings-ws-url-group');
        if (wsUrlGroup) {
            if (isWs) {
                const wsProto = location.protocol === 'https:' ? 'wss:' : 'ws:';
                const apiKey = localStorage.getItem('wled_api_key') || '';
                const wsUrl = `${wsProto}//${location.host}/api/v1/devices/${device.id}/ws?token=${encodeURIComponent(apiKey)}`;
                document.getElementById('settings-ws-url').value = wsUrl;
                wsUrlGroup.style.display = '';
            } else {
                wsUrlGroup.style.display = 'none';
            }
        }

        // Hide health check for devices without health_check capability
        const healthIntervalGroup = document.getElementById('settings-health-interval-group');
        if (healthIntervalGroup) {
            healthIntervalGroup.style.display = caps.includes('health_check') ? '' : 'none';
        }

        // Hide auto-restore for devices without auto_restore capability
        const autoShutdownGroup = document.getElementById('settings-auto-shutdown-group');
        if (autoShutdownGroup) {
            autoShutdownGroup.style.display = caps.includes('auto_restore') ? '' : 'none';
        }
        document.getElementById('settings-auto-shutdown').checked = !!device.auto_shutdown;
        settingsModal.snapshot();
        settingsModal.open();

        setTimeout(() => {
            document.getElementById('settings-device-name').focus();
        }, 100);

    } catch (error) {
        if (error.isAuth) return;
        console.error('Failed to load device settings:', error);
        showToast(t('device.error.settings_load_failed'), 'error');
    }
}

export function isSettingsDirty() { return settingsModal.isDirty(); }
export function forceCloseDeviceSettingsModal() { settingsModal.forceClose(); }
export function closeDeviceSettingsModal() { settingsModal.close(); }

export async function saveDeviceSettings() {
    const deviceId = document.getElementById('settings-device-id').value;
    const name = document.getElementById('settings-device-name').value.trim();
    const url = settingsModal._getUrl();

    if (!name || !url) {
        settingsModal.showError(t('device.error.required'));
        return;
    }

    try {
        const body = {
            name, url,
            auto_shutdown: document.getElementById('settings-auto-shutdown').checked,
            state_check_interval: parseInt(document.getElementById('settings-health-interval').value, 10) || 30,
        };
        const ledCountInput = document.getElementById('settings-led-count');
        if (settingsModal.capabilities.includes('manual_led_count') && ledCountInput.value) {
            body.led_count = parseInt(ledCountInput.value, 10);
        }
        if (isSerialDevice(settingsModal.deviceType)) {
            const baudVal = document.getElementById('settings-baud-rate').value;
            if (baudVal) body.baud_rate = parseInt(baudVal, 10);
        }
        if (isMockDevice(settingsModal.deviceType)) {
            const sendLatency = document.getElementById('settings-send-latency')?.value;
            if (sendLatency !== undefined) body.send_latency_ms = parseInt(sendLatency, 10);
            const ledType = document.getElementById('settings-led-type')?.value;
            body.rgbw = ledType === 'rgbw';
        }
        const deviceResponse = await fetchWithAuth(`/devices/${deviceId}`, {
            method: 'PUT',
            body: JSON.stringify(body)
        });

        if (!deviceResponse.ok) {
            const errorData = await deviceResponse.json();
            settingsModal.showError(t('device.error.update'));
            return;
        }

        showToast(t('settings.saved'), 'success');
        settingsModal.forceClose();
        window.loadDevices();
    } catch (err) {
        if (err.isAuth) return;
        console.error('Failed to save device settings:', err);
        settingsModal.showError(t('device.error.save'));
    }
}

// Brightness
export function updateBrightnessLabel(deviceId, value) {
    const slider = document.querySelector(`[data-device-brightness="${deviceId}"]`);
    if (slider) slider.title = Math.round(parseInt(value) / 255 * 100) + '%';
}

export async function saveCardBrightness(deviceId, value) {
    const bri = parseInt(value);
    updateDeviceBrightness(deviceId, bri);
    try {
        const resp = await fetchWithAuth(`/devices/${deviceId}/brightness`, {
            method: 'PUT',
            body: JSON.stringify({ brightness: bri })
        });
        if (!resp.ok) {
            showToast(t('device.error.brightness'), 'error');
        }
    } catch (err) {
        if (err.isAuth) return;
        showToast(t('device.error.brightness'), 'error');
    }
}

const _brightnessFetchInFlight = new Set();
export async function fetchDeviceBrightness(deviceId) {
    if (_brightnessFetchInFlight.has(deviceId)) return;
    _brightnessFetchInFlight.add(deviceId);
    try {
        const resp = await fetchWithAuth(`/devices/${deviceId}/brightness`);
        if (!resp.ok) return;
        const data = await resp.json();
        updateDeviceBrightness(deviceId, data.brightness);
        const slider = document.querySelector(`[data-device-brightness="${deviceId}"]`);
        if (slider) {
            slider.value = data.brightness;
            slider.title = Math.round(data.brightness / 255 * 100) + '%';
            slider.disabled = false;
        }
        const wrap = document.querySelector(`[data-brightness-wrap="${deviceId}"]`);
        if (wrap) wrap.classList.remove('brightness-loading');
    } catch (err) {
        // Silently fail — device may be offline
    } finally {
        _brightnessFetchInFlight.delete(deviceId);
    }
}

// LED protocol timing constants
const LED_US_PER_BIT = 1.25;              // SK6812/WS2812B bit time (μs)
const LED_BITS_PER_PIXEL = 32;            // RGBW worst case (4 channels × 8 bits)
const LED_US_PER_PIXEL = LED_BITS_PER_PIXEL * LED_US_PER_BIT;  // 40μs
const LED_RESET_US = 80;                  // reset/latch pulse (μs)
const US_PER_SECOND = 1_000_000;

// Serial protocol constants
const SERIAL_BITS_PER_BYTE = 10;          // 8N1: 1 start + 8 data + 1 stop
const SERIAL_RGB_BYTES_PER_LED = 3;
const ADALIGHT_HEADER_BYTES = 6;          // 'Ada' + count_hi + count_lo + checksum
const AMBILED_HEADER_BYTES = 1;

// FPS hint helpers (shared with device-discovery, targets)
export function _computeMaxFps(baudRate, ledCount, deviceType) {
    if (!ledCount || ledCount < 1) return null;
    if (deviceType === 'wled') {
        const frameUs = ledCount * LED_US_PER_PIXEL + LED_RESET_US;
        return Math.floor(US_PER_SECOND / frameUs);
    }
    if (!baudRate) return null;
    const overhead = deviceType === 'ambiled' ? AMBILED_HEADER_BYTES : ADALIGHT_HEADER_BYTES;
    const bitsPerFrame = (ledCount * SERIAL_RGB_BYTES_PER_LED + overhead) * SERIAL_BITS_PER_BYTE;
    return Math.floor(baudRate / bitsPerFrame);
}

export function _renderFpsHint(hintEl, baudRate, ledCount, deviceType) {
    const fps = _computeMaxFps(baudRate, ledCount, deviceType);
    if (fps !== null) {
        hintEl.textContent = `Max FPS ≈ ${fps}`;
        hintEl.style.display = '';
    } else {
        hintEl.style.display = 'none';
    }
}

export function updateSettingsBaudFpsHint() {
    const hintEl = document.getElementById('settings-baud-fps-hint');
    const baudRate = parseInt(document.getElementById('settings-baud-rate').value, 10);
    const ledCount = parseInt(document.getElementById('settings-led-count').value, 10);
    _renderFpsHint(hintEl, baudRate, ledCount, settingsModal.deviceType);
}

// Settings serial port population (used from showSettings)
async function _populateSettingsSerialPorts(currentUrl) {
    const select = document.getElementById('settings-serial-port');
    select.innerHTML = '';
    const loadingOpt = document.createElement('option');
    loadingOpt.value = currentUrl;
    loadingOpt.textContent = currentUrl + ' ⏳';
    select.appendChild(loadingOpt);

    try {
        const discoverType = settingsModal.deviceType || 'adalight';
        const resp = await fetchWithAuth(`/devices/discover?timeout=2&device_type=${encodeURIComponent(discoverType)}`);
        if (!resp.ok) return;
        const data = await resp.json();
        const devices = data.devices || [];

        select.innerHTML = '';
        let currentFound = false;
        devices.forEach(device => {
            const opt = document.createElement('option');
            opt.value = device.url;
            opt.textContent = device.name;
            if (device.url === currentUrl) currentFound = true;
            select.appendChild(opt);
        });
        if (!currentFound) {
            const opt = document.createElement('option');
            opt.value = currentUrl;
            opt.textContent = currentUrl;
            select.insertBefore(opt, select.firstChild);
        }
        select.value = currentUrl;
    } catch (err) {
        console.error('Failed to discover serial ports:', err);
    }
}

export function copyWsUrl() {
    const input = document.getElementById('settings-ws-url');
    if (input && input.value) {
        navigator.clipboard.writeText(input.value).then(() => {
            showToast(t('settings.copied') || 'Copied!', 'success');
        });
    }
}

export async function loadDevices() {
    await window.loadTargetsTab();
}