import {Injectable} from '@angular/core';
import {Settings} from '@app/_models';
import Web3 from 'web3';
import {CICRegistry, TransactionHelper} from 'cic-client';
import {first} from 'rxjs/operators';
import {TransactionService} from '@app/_services/transaction.service';
import {environment} from '@src/environments/environment';
import {HttpGetter} from '@app/_helpers';

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

  constructor(private transactionService: TransactionService) { }

  blockSync(): any {
    const settings = new Settings(this.scan);
    const provider = environment.web3Provider;
    const readyStateElements = { network: 2 };
    settings.w3.provider = provider;
    settings.w3.engine = new Web3(provider);
    settings.registry = new CICRegistry(settings.w3.engine, environment.registryAddress, this.fileGetter,
      ['../../assets/js/block-sync/data']);
    settings.registry.declaratorHelper.addTrust(environment.trustedDeclaratorAddress);
    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 => {
      console.log('loaded network contracts', addressReturned);
      this.readyStateProcessor(settings, readyStateElements.network);
    };

    settings.registry.load();
  }

  readyStateProcessor(settings, bit): void {
    this.readyState |= bit;
    if (this.readyStateTarget === this.readyState && this.readyStateTarget) {
      // console.log('reached readyState target', this.readyStateTarget);
      const wHeadSync = new Worker('./../assets/js/block-sync/head.js');
      wHeadSync.onmessage = (m) => {
        settings.txHelper.processReceipt(m.data);
      };
      wHeadSync.postMessage({
        w3_provider: settings.w3.provider,
      });
      this.fetcher(settings);
    }
  }

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

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

  async scan(settings, lo, hi, bloomBlockBytes, bloomBlocktxBytes, bloomRounds): Promise<void> {
    const w = 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: any, offset: number = 0, limit: number = 100): void {
    this.transactionService.getAllTransactions(offset, limit).pipe(first()).subscribe(data => {
      const blockFilterBinstr = window.atob(data.block_filter);
      const bOne = new Uint8Array(blockFilterBinstr.length);
      bOne.map((e, i, v) => v[i] = blockFilterBinstr.charCodeAt(i));

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

      for (let i = 0; i < blockFilterBinstr.length; i++) {
        if (bOne[i] > 0 ) {
          // console.debug('blocktx value on', i);
        }
      }

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