/**
 * HBY102J 晶全应用层协议：下行 FA … FF，上行 FB/FC … FF。
 * 与 HBY100-J 使用同一颗蓝牙模组 / 同一套 GATT（AE30 + AE03 写 + AE02 通知），
 * 见 `api/100J/HBY100-J.js` 中 SERVICE_UUID / WRITE / NOTIFY；仅帧语义与 100J 不同。
 */

export const HBY102J_SERVICE = '0000AE30-0000-1000-8000-00805F9B34FB'
export const HBY102J_WRITE = '0000AE03-0000-1000-8000-00805F9B34FB'
export const HBY102J_NOTIFY = '0000AE02-0000-1000-8000-00805F9B34FB'

function buildFaFrame(func, dataBytes = []) {
	return [0xfa, func & 0xff, ...dataBytes.map((b) => b & 0xff), 0xff]
}

const BYTE_TO_RADAR = {
	0: 'status_off',
	1: 'status_2M',
	2: 'status_4M',
	3: 'status_7M',
	4: 'status_10M'
}

const BYTE_TO_LED = {
	0: 'led_off',
	1: 'led_flash',
	2: 'led_low_flash',
	3: 'led_steady',
	4: 'led_alarm'
}

const RADAR_KEY_TO_BYTE = {
	status_off: 0,
	status_2M: 1,
	status_4M: 2,
	status_7M: 3,
	status_10M: 4,
	status_on: 1
}

const LED_KEY_TO_BYTE = {
	led_off: 0,
	led_flash: 1,
	led_low_flash: 2,
	led_steady: 3,
	led_alarm: 4
}

export function encodeChannelSet(channelDecimal1to80) {
	const ch = Math.max(1, Math.min(80, Number(channelDecimal1to80) || 1))
	return buildFaFrame(0x21, [ch])
}

export function encodeOnline(on) {
	return buildFaFrame(0x22, [on ? 1 : 0])
}

export function encodeRadarFromUiKey(sta_RadarType) {
	const b = RADAR_KEY_TO_BYTE[sta_RadarType] !== undefined ? RADAR_KEY_TO_BYTE[sta_RadarType] : 0
	return buildFaFrame(0x23, [b])
}

export function encodeWarningLightFromLedKey(ledKey) {
	const m = LED_KEY_TO_BYTE[ledKey] !== undefined ? LED_KEY_TO_BYTE[ledKey] : 0
	return buildFaFrame(0x24, [m])
}

export function encodeQueryOnlineCount() {
	return buildFaFrame(0x25, [0])
}

export function encodeQueryPower() {
	return buildFaFrame(0x26, [])
}

function formatMacFromBytes(u8, start, len) {
	const hex = []
	for (let i = 0; i < len; i++) {
		hex.push(u8[start + i].toString(16).padStart(2, '0'))
	}
	return hex.join(':').toUpperCase()
}

/**
 * 解析设备上行一帧（Notify），输出与 HBY102 页 formData 对齐的字段
 */
export function parseHby102jUplink(u8) {
	const out = {}
	if (!u8 || u8.length < 3) return out

	const h = u8[0]
	const func = u8[1]
	const tail = u8[u8.length - 1]

	if (tail !== 0xff && u8.length >= 4) {
		// 非标准结尾时仍尽量解析
	}

	if (h === 0xfc && u8.length >= 8 && u8[7] === 0xff) {
		out.sta_address = formatMacFromBytes(u8, 1, 6)
		return out
	}

	if (h !== 0xfb) return out

	switch (func) {
		case 0x21:
			if (u8.length >= 4) {
				out.sta_Channel = u8[2]
			}
			break
		case 0x22:
			out.sta_Online = u8[2] === 1 ? 'E49_on' : 'E49_off'
			break
		case 0x23:
			out.sta_RadarType = BYTE_TO_RADAR[u8[2]] !== undefined ? BYTE_TO_RADAR[u8[2]] : 'status_off'
			break
		case 0x24:
			out.sta_LedType = BYTE_TO_LED[u8[2]] !== undefined ? BYTE_TO_LED[u8[2]] : 'led_off'
			break
		case 0x25:
			if (u8.length >= 4) {
				out.sta_onlineQuantity = u8[2]
			}
			break
		case 0x26:
			if (u8.length >= 5) {
				out.sta_PowerPercent = u8[2]
				out.sta_charge = u8[3]
			}
			break
		case 0x27:
			if (u8.length >= 9) {
				out.sta_PowerPercent = u8[2]
				out.sta_charge = u8[3]
				out.sta_Channel = u8[4]
				out.sta_LedType = BYTE_TO_LED[u8[5]] !== undefined ? BYTE_TO_LED[u8[5]] : 'led_off'
				out.sta_RadarType = BYTE_TO_RADAR[u8[6]] !== undefined ? BYTE_TO_RADAR[u8[6]] : 'status_off'
				out.sta_Online = u8[7] === 1 ? 'E49_on' : 'E49_off'
			}
			break
		case 0x28:
			if (u8.length >= 10) {
				const peerMac = formatMacFromBytes(u8, 2, 6)
				const ev = u8[8]
				if (ev === 0x01) {
					out.sta_sosadd = peerMac
					out.sta_Intrusion = 1
				} else if (ev === 0x02) {
					out.sta_sosadd_off = peerMac
				} else if (ev === 0x03) {
					out.sta_tomac = peerMac
				}
			}
			break
		default:
			break
	}
	return out
}