import { Buffer } from "buffer"

export const dBuV_dBm_constant = 106.98 //rssi -dBuV_dBm_constant

export const base64ToBuffer = (base64: string): Buffer => {
    return base64.split(",").reduce((previousValue, currentValue) => {
        const buffer = Buffer.from(currentValue, "base64")
        return Buffer.concat([previousValue, buffer])
    }, Buffer.alloc(0)) // Initial empty buffer
}

export const bufferToArray = (buffer: Buffer): Uint8Array => {
    return Uint8Array.from(buffer)
}

export const base64ToArray = (base64: string): Uint8Array => {
    return bufferToArray(base64ToBuffer(base64))
}

export const hexStringToArray = (hexString: string): Uint8Array => {
    let array = new Uint8Array(hexString.length / 2)
    for (let i = 0; i < hexString.length; i += 2) {
        array[i / 2] = parseInt(hexString.substr(i, 2), 16)
    }

    return array
}

//To Hex
export const base64ToHex = (buffer: string): RegExpMatchArray | any[] => {
    return (
        Array.prototype.map
            .call(new Uint8Array(base64ToBuffer(buffer)), (x) => ("00" + x.toString(16)).slice(-2))
            .join("")
            .match(/[a-fA-F0-9]{2}/g) ?? []
    )
}

export const bufferToHex = (buffer: Buffer): RegExpMatchArray | any[] => {
    return (
        Array.prototype.map
            .call(new Uint8Array(buffer), (x) => ("00" + x.toString(16)).slice(-2))
            .join("")
            .match(/[a-fA-F0-9]{2}/g) ?? []
    )
}

export const arrayToHex = (buffer: Uint8Array): RegExpMatchArray | any[] => {
    return (
        Array.prototype.map
            .call(buffer, (x) => ("00" + x.toString(16)).slice(-2))
            .join("")
            .match(/[a-fA-F0-9]{2}/g) ?? []
    )
}

//Helper
export const hexStringToString = (hex: string) => {
    // Remove any spaces from the hex string
    hex = hex.replace(/\s+/g, "")

    // Check if the hex string length is even
    if (hex.length % 2 !== 0) {
        console.error("Invalid hex string")
        return ""
    }

    let str = ""
    for (let i = 0; i < hex.length; i += 2) {
        let hexPair = hex.slice(i, i + 2)
        let decimalValue = parseInt(hexPair, 16)
        str += String.fromCharCode(decimalValue)
    }

    return str
}

export const findSubarrayIndex = (arr: any[], subArr: any[]) => {
    for (let i = 0; i <= arr.length - subArr.length; i++) {
        let match = true
        for (let j = 0; j < subArr.length; j++) {
            if (arr[i + j] !== subArr[j]) {
                match = false
                break
            }
        }
        if (match) {
            return i
        }
    }
    return -1
}
//Helper

//Global Function
export const getHeader = (array: Uint8Array) => {
    if (array[0] === 167 && array[1] === 179 && array.length > 8) {
        return array.slice(0, 8)
    }
    return null // Ensure all code paths return a value
}

export const getResponse = (array: Uint8Array) => {
    if (array[0] === 167 && array[1] === 179 && array.length > 8) {
        return array.slice(8)
    }
    return null // Ensure all code paths return a value
}

export const formatValue = (input: string | Uint8Array, store: string = "") => {
    let header
    if (typeof input === "string") {
        input = base64ToArray(input)
    }
    header = getHeader(input)

    if (header) {
        const hexArray = arrayToHex(header)
        switch (hexArray[3].toUpperCase()) {
            case "C2":
                return { type: "rfid", ...formatRFID(input, store) }
            case "6A":
                return { type: "barcode", ...formatBarcode(input, store) }
            case "D9":
                return { type: "notification", ...formatNotification(input) }
            case "E8":
                return { type: "silicon", ...formatBarcode(input, store) }
            case "5F":
                return { type: "bluetooth", ...formatBarcode(input, store) }
            default:
                return { type: "unknown", ...formatBarcode(input, store) }
        }
    }

    return { type: "unknown", value: "", completed: true }
}

//7.1 API Format Destination/Source Type
export const getType = (array: Uint8Array) => {
    const header = getHeader(array)

    if (header) {
        const hexArray = arrayToHex(header)
        switch (hexArray[3].toUpperCase()) {
            case "C2":
                return "RFID"
            case "6A":
                return "Barcode"
            case "D9":
                return "Notification"
            case "E8":
                return "Silicon Lab IC"
            case "5F":
                return "Bluetooth IC"
            default:
                return "Yong Dunno"
        }
    }

    return ""
}

export const getTypeEnum = (input: string | Uint8Array) => {
    let header
    if (typeof input === "string") {
        input = base64ToArray(input)
    }
    header = getHeader(input)

    if (header) {
        const hexArray = arrayToHex(header)
        switch (hexArray[3].toUpperCase()) {
            case "C2":
                return "rfid"
            case "6A":
                return "barcode"
            case "D9":
                return "notification"
            case "E8":
                return "silicon"
            case "5F":
                return "bluetooth"
            default:
                return "unknown"
        }
    }

    return ""
}

//9.2.1 Uplink Barcode Payload Format (Page 25)
export const formatBarcode = (array: Uint8Array, store?: string) => {
    const content = getResponse(array)

    if (content) {
        const hexArray = arrayToHex(content)

        // Removed unused variable `type`

        const value = hexArray.slice(2)

        // To extract the prefix value from the scanner
        const prefixArr = ["02", "00", "07", "10", "17", "13"]
        const suffixArr = ["05", "01", "11", "16", "03", "04"]

        let processedValue = value

        const prefixIndex = findSubarrayIndex(processedValue, prefixArr)
        if (prefixIndex >= 0) {
            processedValue = processedValue.slice(prefixIndex + prefixArr.length + 4)
        }

        const suffixIndex = findSubarrayIndex(processedValue, suffixArr)
        if (suffixIndex >= 0) {
            processedValue = processedValue.slice(0, suffixIndex)
        }

        return { value: store + hexStringToString(processedValue.join("")), completed: suffixIndex > 0 }
    }

    return { value: store + "", completed: false }
}

export const formatBarcodeWithContentArray = (array: Uint8Array) => {
    const hexArray = arrayToHex(array)

    // Removed unused variable `type`

    const value = hexArray.slice(2)

    // To extract the prefix value from the scanner
    const prefixArr = ["02", "00", "07", "10", "17", "13"]
    const suffixArr = ["05", "01", "11", "16", "03", "04"]

    const prefixIndex = findSubarrayIndex(value, prefixArr)
    const suffixIndex = findSubarrayIndex(value, suffixArr)

    let processedValue = value

    if (prefixIndex >= 0) {
        processedValue = processedValue.slice(prefixIndex + prefixArr.length + 4)
    }

    if (suffixIndex >= 0) {
        processedValue = processedValue.slice(0, suffixIndex)
    }

    return hexStringToString(processedValue.join(""))
}

export const formatNotification = (array: Uint8Array) => {
    const content = getResponse(array)

    if (content) {
        const hexArray = arrayToHex(content)

        const responseHeader = hexArray.slice(0, 2).join("").toLocaleUpperCase()
        const responseData = content.slice(2)

        switch (responseHeader) {
            case "A000": {
                if (responseData[0] && responseData[1]) {
                    const batteryValue = (responseData[0] << 8) | responseData[1]
                    const batteryFloat = batteryValue / 1000

                    return { value: `battery_${getBatteryPercentage(batteryFloat).toFixed(0)}`, completed: true }
                } else {
                    return { value: "error", completed: true }
                }
            }
            case "A001":
                if (responseData[0] === 1) {
                    return { value: "trigger_pushed", completed: true }
                } else {
                    return { value: "trigger_released", completed: true }
                }
            case "A101":
                return { value: "", completed: true }
            case "A102":
                return { value: "trigger_pushed", completed: true }
            case "A103":
                return { value: "trigger_released", completed: true }
        }
    }

    return { value: "", completed: true }
}

//9.2.1 Uplink Barcode Payload Format (Page 25)
export const formatRFID = (array: Uint8Array, store?: string) => {
    const content = getResponse(array)

    if (content) {
        const rfidHeader = content.slice(2)

        if (rfidHeader[0] === 0x03) {
            //basic mode
            //TODO: Not completed
            return formatRFIDBasic(array, store)
        } else if (rfidHeader[0] === 0x04) {
            //compact mode
            return formatRFIDCompact(array, store)
        } else {
            return { value: { epc: "", rssi: -1 }, completed: true }
        }
    }

    return { value: { epc: "", rssi: -1 }, completed: true }
}

export const formatRFIDCompact = (array: Uint8Array, store?: string) => {
    const content = getResponse(array)

    if (content) {
        // Removed unused variables `hexArray`, `flags`, `pkt_type`, and `pkt_len`

        const rfidResponse = content.slice(10)
        const pc = (rfidResponse[0]! << 8) | rfidResponse[1]!
        const epc_len = (pc >> 11) * 2
        const epc = arrayToHex(rfidResponse.slice(2, 2 + epc_len)).join("")
        const rssiRaw = parseInt(arrayToHex(rfidResponse.slice(2 + epc_len, 2 + epc_len + 1)).join(""), 16)
            .toString(2)
            .padStart(8, "0")

        const Mantissa = parseInt(rssiRaw.slice(-3), 2)
        const Exponent = parseInt(rssiRaw.slice(0, 5), 2)
        const Mantissa_Size = 3
        const rssi = +(20 * Math.log10(Math.pow(2, Exponent) * (1 + Mantissa / Math.pow(2, Mantissa_Size))) - dBuV_dBm_constant).toFixed(1)

        return { value: { epc, rssi }, completed: true }
    }

    return { value: { epc: "", rssi: -1 }, completed: true }
}

export const formatRFIDBasic = (array: Uint8Array, store?: string) => {
    const content = getResponse(array)

    if (content) {
        // Removed unused variables `hexArray`, `flags`, `pkt_len`, and `wb_rssi`

        const rfidHeader = content.slice(2)
        const nb_rssi = rfidHeader[13]!.toString(2).padStart(8, "0")

        const inv_data_len = ((rfidHeader[5]! << 8) | rfidHeader[4]!) - 3 * 4 - ((rfidHeader[1]! >> 6) & 3)
        const rfidResponse = content.slice(22, 22 + inv_data_len)
        const pc = (rfidResponse[0]! << 8) | rfidResponse[1]!
        const epc_len = (pc >> 11) * 2
        const epc = arrayToHex(rfidResponse.slice(2, 2 + epc_len)).join("")

        const Mantissa = parseInt(nb_rssi.slice(-3), 2)
        const Exponent = parseInt(nb_rssi.slice(0, 5), 2)
        const Mantissa_Size = 3
        const rssi = Number((20 * Math.log10(Math.pow(2, Exponent) * (1 + Mantissa / Math.pow(2, Mantissa_Size)))).toFixed(0))

        return { value: { epc, rssi }, completed: true }
    }

    return { value: { epc: "", rssi: -1 }, completed: true }
}

export const validateCRC = (array: Uint8Array) => {
    // Example values for the other variables
    let cs108DataReadStart = 0 // Example value, set it as needed
    let dataIn = array // Example array, replace with actual data

    let bcheckChecksum = true
    let checksum = (dataIn[cs108DataReadStart + 6]! & 0xff) * 256 + (dataIn[cs108DataReadStart + 7]! & 0xff)
    let iPayloadLength = dataIn[cs108DataReadStart + 2]! // Example value, set it as needed
    let checksum2 = 0

    if (bcheckChecksum) {
        for (let i = cs108DataReadStart; i < cs108DataReadStart + 8 + iPayloadLength; i++) {
            if (i !== cs108DataReadStart + 6 && i !== cs108DataReadStart + 7) {
                let index = (checksum2 ^ (dataIn[i]! & 0xff)) & 0xff
                let table_value = crc_lookup_table[index]!
                checksum2 = (checksum2 >> 8) ^ table_value
            }
        }
    }

    return checksum === checksum2
}

const crc_lookup_table = [
    0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5,
    0x472c, 0x75b7, 0x643e, 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 0xad4a, 0xbcc3,
    0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd,
    0xc974, 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 0x5285, 0x430c, 0x7197, 0x601e,
    0x14a1, 0x0528, 0x37b3, 0x263a, 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 0xef4e,
    0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862,
    0x9af9, 0x8b70, 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 0x9489, 0x8500, 0xb79b,
    0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
    0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc131, 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7,
    0x6e6e, 0x5cf5, 0x4d7c, 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 0xd68d, 0xc704,
    0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238,
    0x93b1, 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 0x7bc7, 0x6a4e, 0x58d5, 0x495c,
    0x3de3, 0x2c6a, 0x1ef1, 0x0f78,
]

export const combineUint8Arrays = (arr1: Uint8Array, arr2: Uint8Array): Uint8Array => {
    // Create a new Uint8Array with the combined length of both arrays
    let combinedArray = new Uint8Array(arr1.length + arr2.length)

    // Copy arr1 to the new array starting at index 0
    combinedArray.set(arr1)

    // Copy arr2 to the new array starting after arr1
    combinedArray.set(arr2, arr1.length)

    return combinedArray
}

export const hexStringToReversedUint8Array = (hexString: string): Uint8Array => {
    // Ensure the hex string has even length
    if (hexString.length % 2 !== 0) {
        throw new Error("Invalid hex string length")
    }

    // Create an array of bytes from the hex string
    const byteArray: number[] = []
    for (let i = 0; i < hexString.length; i += 2) {
        const byte = parseInt(hexString.substr(i, 2), 16)
        byteArray.push(byte)
    }

    // Reverse the byte array
    byteArray.reverse()

    // Create a Uint8Array from the reversed array
    return new Uint8Array(byteArray)
}

const getBatteryPercentage = (voltage: number) => {
    // Define the voltage range for a typical lithium-ion battery
    const FULL_VOLTAGE = 4.2 // Fully charged voltage
    const EMPTY_VOLTAGE = 3.0 // Fully discharged voltage (safe limit)

    // Bound the voltage within the safe range
    if (voltage >= FULL_VOLTAGE) {
        return 100
    } else if (voltage <= EMPTY_VOLTAGE) {
        return 0
    }

    // Calculate percentage based on a linear relationship between voltage and capacity
    return ((voltage - EMPTY_VOLTAGE) / (FULL_VOLTAGE - EMPTY_VOLTAGE)) * 100
}