"use strict"

var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k
    var desc = Object.getOwnPropertyDescriptor(m, k)
    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
      desc = { enumerable: true, get: function() { return m[k] } }
    }
    Object.defineProperty(o, k2, desc)
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k
    o[k2] = m[k]
}))

var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v })
}) : function(o, v) {
    o["default"] = v
})

var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod
    var result = {}
    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k)
    __setModuleDefault(result, mod)
    return result
}

Object.defineProperty(exports, "__esModule", { value: true })

const constants = __importStar(require("./constants"))
const jid_utils_1 = require("./jid-utils")

const encodeBinaryNode = (node, opts = constants, buffer = [0]) => {
    const encoded = encodeBinaryNodeInner(node, opts, buffer)
    return Buffer.from(encoded)
}

const encodeBinaryNodeInner = ({ tag, attrs, content }, opts, buffer) => {
    const { TAGS, TOKEN_MAP } = opts
    const pushByte = (value) => buffer.push(value & 0xff)
    const pushInt = (value, n, littleEndian = false) => {
        for (let i = 0; i < n; i++) {
            const curShift = littleEndian ? i : n - 1 - i
            buffer.push((value >> (curShift * 8)) & 0xff)
        }
    }
    
    const pushBytes = (bytes) => {
        for (const b of bytes) {
            buffer.push(b)
        }
    }
    
    const pushInt16 = (value) => {
        pushBytes([(value >> 8) & 0xff, value & 0xff])
    }
    
    const pushInt20 = (value) => (pushBytes([(value >> 16) & 0x0f, (value >> 8) & 0xff, value & 0xff]))
    const writeByteLength = (length) => {
        if (length >= 4294967296) {
            throw new Error('string too large to encode: ' + length)
        }
        if (length >= 1 << 20) {
            pushByte(TAGS.BINARY_32)
            pushInt(length, 4) // 32 bit integer
        }
        else if (length >= 256) {
            pushByte(TAGS.BINARY_20)
            pushInt20(length)
        }
        else {
            pushByte(TAGS.BINARY_8)
            pushByte(length)
        }
    }
    
    const writeStringRaw = (str) => {
        const bytes = Buffer.from(str, 'utf-8')
        writeByteLength(bytes.length)
        pushBytes(bytes)
    }
    
    const writeJid = ({ domainType, device, user, server }) => {
        if (typeof device !== 'undefined') {
            pushByte(TAGS.AD_JID)
            pushByte(domainType || 0)
            pushByte(device || 0)
            writeString(user)
        }
        else {
            pushByte(TAGS.JID_PAIR)
            if (user.length) {
                writeString(user)
            }
            else {
                pushByte(TAGS.LIST_EMPTY)
            }
            writeString(server)
        }
    }
    
    const packNibble = (char) => {
        switch (char) {
            case '-':
                return 10
            case '.':
                return 11
            case '\0':
                return 15
            default:
                if (char >= '0' && char <= '9') {
                    return char.charCodeAt(0) - '0'.charCodeAt(0)
                }
                throw new Error(`invalid byte for nibble "${char}"`)
        }
    }
    
    const packHex = (char) => {
        if (char >= '0' && char <= '9') {
            return char.charCodeAt(0) - '0'.charCodeAt(0)
        }
        if (char >= 'A' && char <= 'F') {
            return 10 + char.charCodeAt(0) - 'A'.charCodeAt(0)
        }
        if (char >= 'a' && char <= 'f') {
            return 10 + char.charCodeAt(0) - 'a'.charCodeAt(0)
        }
        if (char === '\0') {
            return 15
        }
        throw new Error(`Invalid hex char "${char}"`)
    }
    
    const writePackedBytes = (str, type) => {
        if (str.length > TAGS.PACKED_MAX) {
            throw new Error('Too many bytes to pack')
        }
        pushByte(type === 'nibble' ? TAGS.NIBBLE_8 : TAGS.HEX_8)
        let roundedLength = Math.ceil(str.length / 2.0)
        if (str.length % 2 !== 0) {
            roundedLength |= 128
        }
        pushByte(roundedLength)
        const packFunction = type === 'nibble' ? packNibble : packHex
        const packBytePair = (v1, v2) => {
            const result = (packFunction(v1) << 4) | packFunction(v2)
            return result
        }
        const strLengthHalf = Math.floor(str.length / 2)
        for (let i = 0; i < strLengthHalf; i++) {
            pushByte(packBytePair(str[2 * i], str[2 * i + 1]))
        }
        if (str.length % 2 !== 0) {
            pushByte(packBytePair(str[str.length - 1], '\x00'))
        }
    }
    
    const isNibble = (str) => {
        if (!str || str.length > TAGS.PACKED_MAX) {
            return false
        }
        for (const char of str) {
            const isInNibbleRange = char >= '0' && char <= '9'
            if (!isInNibbleRange && char !== '-' && char !== '.') {
                return false
            }
        }
        return true
    }
    
    const isHex = (str) => {
        if (!str || str.length > TAGS.PACKED_MAX) {
            return false
        }
        for (const char of str) {
            const isInNibbleRange = char >= '0' && char <= '9'
            if (!isInNibbleRange && !(char >= 'A' && char <= 'F')) {
                return false
            }
        }
        return true
    }
    
    const writeString = (str) => {
    	if (str === undefined || str === null) {
            pushByte(TAGS.LIST_EMPTY)
            return
        }
        const tokenIndex = TOKEN_MAP[str]
        if (tokenIndex) {
            if (typeof tokenIndex.dict === 'number') {
                pushByte(TAGS.DICTIONARY_0 + tokenIndex.dict)
            }
            pushByte(tokenIndex.index)
        }
        else if (isNibble(str)) {
            writePackedBytes(str, 'nibble')
        }
        else if (isHex(str)) {
            writePackedBytes(str, 'hex')
        }
        else if (str) {
            const decodedJid = (0, jid_utils_1.jidDecode)(str)
            if (decodedJid) {
                writeJid(decodedJid)
            }
            else {
                writeStringRaw(str)
            }
        }
    }
    
    const writeListStart = (listSize) => {
        if (listSize === 0) {
            pushByte(TAGS.LIST_EMPTY)
        }
        else if (listSize < 256) {
            pushBytes([TAGS.LIST_8, listSize])
        }
        else {
            pushByte(TAGS.LIST_16)
            pushInt16(listSize)
        }
    }
    
    if (!tag) {
        throw new Error('Invalid node: tag cannot be undefined')
    }
    
    const validAttributes = Object.keys(attrs).filter(k => (typeof attrs[k] !== 'undefined' && attrs[k] !== null))
    writeListStart(2 * validAttributes.length + 1 + (typeof content !== 'undefined' ? 1 : 0))
    writeString(tag)
    for (const key of validAttributes) {
        if (typeof attrs[key] === 'string') {
            writeString(key)
            writeString(attrs[key])
        }
    }
    if (typeof content === 'string') {
        writeString(content)
    }
    else if (Buffer.isBuffer(content) || content instanceof Uint8Array) {
        writeByteLength(content.length)
        pushBytes(content)
    }
    else if (Array.isArray(content)) {
    	const validContent = content.filter(item => item && (item.tag || Buffer.isBuffer(item) || item instanceof Uint8Array || typeof item === 'string'))
        writeListStart(validContent.length)
        for (const item of validContent) {
            encodeBinaryNodeInner(item, opts, buffer)
        }
    }
    else if (typeof content === 'undefined') {
        // do nothing
    }
    else {
        throw new Error(`invalid children for header "${tag}": ${content} (${typeof content})`)
    }
    return buffer
}

module.exports = {
  encodeBinaryNode 
}