import {Injectable} from '@angular/core';
import {Settings} from '@app/_models';
import {TransactionHelper} from 'cic-client';
import {first} from 'rxjs/operators';
import {TransactionService} from '@app/_services/transaction.service';
import {environment} from '@src/environments/environment';
import {LoggingService} from '@app/_services/logging.service';
import {RegistryService} from '@app/_services/registry.service';

@Injectable({
  providedIn: 'root'
})
export class BlockSyncService {
  readyStateTarget: number = 2;
  readyState: number = 0;

  constructor(
    private transactionService: TransactionService,
    private loggingService: LoggingService,
    private registryService: RegistryService,
  ) { }

  blockSync(address: string = null, offset: number = 0, limit: number = 100): void {
    this.transactionService.resetTransactionsList();
    const settings: Settings = new Settings(this.scan);
    const readyStateElements: { network: number } = { network: 2 };
    settings.w3.provider = environment.web3Provider;
    settings.w3.engine = this.registryService.getWeb3();
    settings.registry = this.registryService.getRegistry();
    settings.txHelper = new TransactionHelper(settings.w3.engine, settings.registry);

    settings.txHelper.ontransfer = async (transaction: any): Promise<void> => {
      window.dispatchEvent(this.newTransferEvent(transaction));
    };
    settings.txHelper.onconversion = async (transaction: any): Promise<any> => {
      window.dispatchEvent(this.newConversionEvent(transaction));
    };
    settings.registry.onload = (addressReturned: number): void => {
      this.loggingService.sendInfoLevelMessage(`Loaded network contracts ${addressReturned}`);
      this.readyStateProcessor(settings, readyStateElements.network, address, offset, limit);
    };

    settings.registry.load();
  }

  readyStateProcessor(settings: Settings, bit: number, address: string, offset: number, limit: number): void {
    this.readyState |= bit;
    if (this.readyStateTarget === this.readyState && this.readyStateTarget) {
      const wHeadSync: Worker = new Worker('./../assets/js/block-sync/head.js');
      wHeadSync.onmessage = (m) => {
        settings.txHelper.processReceipt(m.data);
      };
      wHeadSync.postMessage({
        w3_provider: settings.w3.provider,
      });
      if (address === null) {
        this.transactionService.getAllTransactions(offset, limit).pipe(first()).subscribe(res => {
          this.fetcher(settings, res);
        });
      } else {
        this.transactionService.getAddressTransactions(address, offset, limit).pipe(first()).subscribe(res => {
          this.fetcher(settings, res);
        });
      }
    }
  }

  newTransferEvent(tx: any): any {
    return new CustomEvent('cic_transfer', {
      detail: {
        tx,
      },
    });
  }

  newConversionEvent(tx: any): any {
    return new CustomEvent('cic_convert', {
      detail: {
        tx,
      },
    });
  }

  async scan(settings: Settings, lo: number, hi: number, bloomBlockBytes: Uint8Array, bloomBlocktxBytes: Uint8Array, bloomRounds: any): Promise<void> {
    const w: Worker = new Worker('./../assets/js/block-sync/ondemand.js');
    w.onmessage = (m) => {
      settings.txHelper.processReceipt(m.data);
    };
    w.postMessage({
      w3_provider: settings.w3.provider,
      lo,
      hi,
      filters: [
        bloomBlockBytes,
        bloomBlocktxBytes,
      ],
      filter_rounds: bloomRounds,
    });
  }

  fetcher(settings: Settings, transactionsInfo: any): void {
    const blockFilterBinstr: string = window.atob(transactionsInfo.block_filter);
    const bOne: Uint8Array = new Uint8Array(blockFilterBinstr.length);
    bOne.map((e, i, v) => v[i] = blockFilterBinstr.charCodeAt(i));

    const blocktxFilterBinstr: string = window.atob(transactionsInfo.blocktx_filter);
    const bTwo: Uint8Array = new Uint8Array(blocktxFilterBinstr.length);
    bTwo.map((e, i, v) => v[i] = blocktxFilterBinstr.charCodeAt(i));

    settings.scanFilter(settings, transactionsInfo.low, transactionsInfo.high, bOne, bTwo, transactionsInfo.filter_rounds);
  }
}