import { toHex, numberToHex } from 'web3-utils';
import { convert } from 'ethereumjs-units';
import { EthEntity, dealWithInputsResult, trezorBtcEntityResult } from "../model/eth";
import * as BipPath from "bip32-path";
import { CoinType, HDType } from '../model/utils';
import { convertCoinAddress } from '../common/convert';
import { SEND_ENUM, PAY_ENUM } from "../model/btc";
import { writeInfoLog } from '../common/logger';
const bitcoinjslib = require("bitcoinjs-lib");
const bitcore = require("bitcore-lib");
const util = require("util");

class TrezorLogic {
    private coin_type: string;
    constructor(coinType: string) {
        this.coin_type = coinType;
        writeInfoLog(`初始化交易签名逻辑处理类.`);
    }

    public async getTrezorEntity(data: any): Promise<any> {
        writeInfoLog(`构造trezor签名实体对象.`);
        switch (this.coin_type) {
            case CoinType.ETH:
                return await this.getEthTrezorEntity(data);
            case CoinType.BTC:
            default:
                return await this.getBtcSeriesTrezorEntity(data);
        }
    }

    public async getBtcSeriesTrezorEntity(data: any): Promise<trezorBtcEntityResult> {
        writeInfoLog(`构造ledger btc系列 签名实体对象`);
        if (this.coin_type === CoinType.LTC || this.coin_type === CoinType.BCH) {
            data.input.address = convertCoinAddress(data.input.address, this.coin_type, HDType.TREZOR);
            data.outputs.forEach((item: any) => {
                item.address = convertCoinAddress(item.address, this.coin_type, HDType.TREZOR);
            });
            if (data.input.paths.length > 1) {
                data.input = this.dealWithInputs(data.input);
            }
        }
        return {
            inputs: await this.getTrezorInputs(data),
            outputs: await this.getTrezorOutputs(data.outputs),
            multisig: data.input && data.input.paths && data.input.paths.length > 1 ? true : false
        }
    }

    /**
     获取trezor的inputs的数据结构
     @param      utxos        未花费的交易数组
     @param      paths        构成转出地址的路径数组
     @param      signIndex      当前用于签名的路径序号
     @param      requires      最小签名数量
     @param      envCoin
     @param      redeemScript  赎回脚本
     @return      返回trezor可用的inputs
     **/
    private async getTrezorInputs(data: any): Promise<any> {
        try {
            writeInfoLog(`构造trezor的inputs的数据结构.`);
            let inputs: Array<any> = [], input: any = {};
            let dataInput: any = data.input;
            data.utxos.forEach(utxo => {
                input = {
                    address_n: BipPath.fromString(dataInput.paths[dataInput.signIndex].path).toPathArray(),
                    prev_index: utxo.index,
                    prev_hash: utxo.txid
                }
                input.script_type = dataInput.paths[dataInput.signIndex].addressType;
                input.amount = JSON.stringify(bitcore.Unit.fromBTC(utxo.coinNum).toSatoshis());
                inputs.push(input);
            });
            //多签地址
            if (dataInput.paths.length > 1) {
                let pubkeys: any = [];
                dataInput.paths.forEach(path => {
                    let address_n = BipPath.fromString(path.path).toPathArray();
                    address_n.splice(0, 3);
                    pubkeys.push({
                        node: path.xpub,
                        address_n: address_n
                    });
                });
                inputs.forEach(input => {
                    input.script_type = SEND_ENUM.multi;
                    input.multisig = {};
                    input.multisig.pubkeys = pubkeys;
                    input.multisig.signatures = Array(pubkeys.length).fill("");		//数组为引用类型，因此通过新的变量赋值
                    input.multisig.m = dataInput.requires;
                });
            }
            return inputs;
        } catch (error) {
            throw new Error(`构造trezor的inputs的数据结构失败，错误信息：${error.message}`);
        }
    }

    /**
     * 获取 trezor 需要的 outputs 结构
     * @param outputs
     * @returns {Promise<Array>}
     */
    private async getTrezorOutputs(outputs) {
        try {
            writeInfoLog(`构造 trezor 需要的 outputs 结构.`);
            let tmpArray: Array<any> = [];
            outputs.forEach(output => {
                if (!output.address && output.coinNum === 0) {
                    tmpArray.push({
                        op_return_data: output.hex.substr(4),
                        amount: '0',
                        script_type: PAY_ENUM.op_return_type
                    });
                } else {
                    tmpArray.push({
                        address: output.address,
                        amount: JSON.stringify(bitcore.Unit.fromBTC(output.coinNum).toSatoshis()),
                        script_type: output.isScript ? PAY_ENUM.p2sh : PAY_ENUM.p2pkh
                    });
                }
            });
            return tmpArray;
        } catch (error) {
            throw new Error(`构造 trezor 需要的 outputs 结构失败，错误信息：${error.message}`);
        }
    }

    /**
     * 处理BCH、LTC中paths顺序以及signIndex字段
     * @param dataInputs 
     */
    private dealWithInputs(dataInputs): dealWithInputsResult {
        try {
            writeInfoLog(`处理BCH、LTC中paths顺序以及signIndex字段.`);
            // decode redeemScript, 取其中的publicKey
            let redeemBuf: any = bitcoinjslib.script.decompile(Buffer.from(dataInputs.redeemScript, 'hex'));
            let newPaths: Array<any> = new Array();
            let newSignIndex: any = null;
            redeemBuf.forEach(item => {
                let index = 0;
                if (util.isBuffer(item)) {
                    // p.push(item.toString('hex'));
                    if (dataInputs.paths[dataInputs.signIndex].addressPublicKey === item.toString('hex')) {
                        newSignIndex = index;
                    }
                    dataInputs.paths.forEach(path => {
                        if (path.addressPublicKey === item.toString('hex')) {
                            newPaths.push(path)
                        }
                    });
                    index++;
                }
            });
            dataInputs.paths = newPaths;
            dataInputs.signIndex = newSignIndex;
            return dataInputs;
        } catch (error) {
            throw new Error(`处理BCH、LTC中paths顺序以及signIndex字段失败，错误信息：${error.message}`);
        }
    }

    /**
     * 获取签名需要返回的数据  - ETH
     * @param data      服务返回签名所需要的数据
     * @returns transaction  返回交易对象
     */
    private getEthTrezorEntity(data: any): any {
        try {
            writeInfoLog(`构造ledger eth 签名实体对象`);
            let entity: EthEntity = {
                // path: data.input.path,
                nonce: numberToHex(data.nonce),
                gasPrice: numberToHex(data.gasPrice),
                gasLimit: numberToHex(data.gasLimit),
                to: toHex(data.toAddress),
                value: numberToHex(convert(data.txnCoinNum, 'eth', 'wei')),
                data: data.data == null ? '' : toHex(data.data),
                chainId: Number(data.chainId)
            }
            return {
                path: data.input.path,
                entity: entity
            };
        } catch (error) {
            throw new Error(`构造ledger eth 签名实体对象失败，错误信息：${error.message}`);
        }
    }
}

export {
    TrezorLogic
}