import { Injectable } from '@angular/core';
import {first} from 'rxjs/operators';
import {BehaviorSubject, Observable} from 'rxjs';
import {environment} from '@src/environments/environment';
import {Envelope, User} from 'cic-client-meta';
import {UserService} from '@app/_services/user.service';
import { Keccak } from 'sha3';
import { utils } from 'ethers';
import {add0x, fromHex, strip0x, toHex} from '@src/assets/js/ethtx/dist/hex';
import {Tx} from '@src/assets/js/ethtx/dist';
import {toValue} from '@src/assets/js/ethtx/dist/tx';
import * as secp256k1 from 'secp256k1';
import {AuthService} from '@app/_services/auth.service';
import {defaultAccount} from '@app/_models';
import {LoggingService} from '@app/_services/logging.service';
import {HttpClient} from '@angular/common/http';
import {CICRegistry} from 'cic-client';
import {RegistryService} from '@app/_services/registry.service';
import Web3 from 'web3';
const vCard = require('vcard-parser');

@Injectable({
  providedIn: 'root'
})
export class TransactionService {
  transactions: any[] = [];
  private transactionList = new BehaviorSubject<any[]>(this.transactions);
  transactionsSubject = this.transactionList.asObservable();
  userInfo: any;
  web3: Web3;
  registry: CICRegistry;

  constructor(
    private httpClient: HttpClient,
    private authService: AuthService,
    private userService: UserService,
    private loggingService: LoggingService,
    private registryService: RegistryService,
  ) {
    this.web3 = this.registryService.getWeb3();
    this.registry = registryService.getRegistry();
    this.registry.load();
  }

  getAllTransactions(offset: number, limit: number): Observable<any> {
    return this.httpClient.get(`${environment.cicCacheUrl}/tx/${offset}/${limit}`);
  }

  getAddressTransactions(address: string, offset: number, limit: number): Observable<any> {
    return this.httpClient.get(`${environment.cicCacheUrl}/tx/${address}/${offset}/${limit}`);
  }

  async setTransaction(transaction, cacheSize: number): Promise<void> {
    if (this.transactions.find(cachedTx => cachedTx.tx.txHash === transaction.tx.txHash)) { return; }
    transaction.value = Number(transaction.value);
    transaction.type = 'transaction';
    try {
      this.userService.getAccountDetailsFromMeta(await User.toKey(transaction.from)).pipe(first()).subscribe((res) => {
        transaction.sender = this.getAccountInfo(res.body);
      }, error => {
        transaction.sender = defaultAccount;
      });
      this.userService.getAccountDetailsFromMeta(await User.toKey(transaction.to)).pipe(first()).subscribe((res) => {
        transaction.recipient = this.getAccountInfo(res.body);
      }, error => {
        transaction.recipient = defaultAccount;
      });
    } finally {
      this.addTransaction(transaction, cacheSize);
    }
  }

  async setConversion(conversion, cacheSize): Promise<void> {
    if (this.transactions.find(cachedTx => cachedTx.tx.txHash === conversion.tx.txHash)) { return; }
    conversion.type = 'conversion';
    conversion.fromValue = Number(conversion.fromValue);
    conversion.toValue = Number(conversion.toValue);
    try {
      this.userService.getAccountDetailsFromMeta(await User.toKey(conversion.trader)).pipe(first()).subscribe((res) => {
        conversion.sender = conversion.recipient = this.getAccountInfo(res.body);
      }, error => {
        conversion.sender = conversion.recipient = defaultAccount;
      });
    } finally {
      this.addTransaction(conversion, cacheSize);
    }
  }

  addTransaction(transaction, cacheSize: number): void {
    this.transactions.unshift(transaction);
    if (this.transactions.length > cacheSize) {
      this.transactions.length = cacheSize;
    }
    this.transactionList.next(this.transactions);
  }

  resetTransactionsList(): void {
    this.transactions = [];
    this.transactionList.next(this.transactions);
  }

  getAccountInfo(account: string): any {
    let accountInfo = Envelope.fromJSON(JSON.stringify(account)).unwrap().m.data;
    accountInfo.vcard = vCard.parse(atob(accountInfo.vcard));
    return accountInfo;
  }

  async transferRequest(tokenAddress: string, senderAddress: string, recipientAddress: string, value: number): Promise<any> {
    const transferAuthAddress = await this.registry.getContractAddressByName('TransferAuthorization');
    const hashFunction = new Keccak(256);
    hashFunction.update('createRequest(address,address,address,uint256)');
    const hash = hashFunction.digest();
    const methodSignature = hash.toString('hex').substring(0, 8);
    const abiCoder = new utils.AbiCoder();
    const abi = await abiCoder.encode(['address', 'address', 'address', 'uint256'], [senderAddress, recipientAddress, tokenAddress, value]);
    const data = fromHex(methodSignature + strip0x(abi));
    const tx = new Tx(environment.bloxbergChainId);
    tx.nonce = await this.web3.eth.getTransactionCount(senderAddress);
    tx.gasPrice = Number(await this.web3.eth.getGasPrice());
    tx.gasLimit = 8000000;
    tx.to = fromHex(strip0x(transferAuthAddress));
    tx.value = toValue(value);
    tx.data = data;
    const txMsg = tx.message();
    const privateKey =  this.authService.mutableKeyStore.getPrivateKey();
    if (!privateKey.isDecrypted()) {
      const password = window.prompt('password');
      await privateKey.decrypt(password);
    }
    const signatureObject = secp256k1.ecdsaSign(txMsg, privateKey.keyPacket.privateParams.d);
    const r = signatureObject.signature.slice(0, 32);
    const s = signatureObject.signature.slice(32);
    const v = signatureObject.recid;
    tx.setSignature(r, s, v);
    const txWire = add0x(toHex(tx.serializeRLP()));
    const result = await this.web3.eth.sendSignedTransaction(txWire);
    this.loggingService.sendInfoLevelMessage(`Result: ${result}`);
    const transaction = await this.web3.eth.getTransaction(result.transactionHash);
    this.loggingService.sendInfoLevelMessage(`Transaction: ${transaction}`);
  }
}