import { Observable } from 'rxjs';
import CoinbaseWalletSDK from '@coinbase/wallet-sdk'

import {
  IConnectorMessage,
  IProvider,
  INetwork,
  IEvent,
  IEventError,
  INativeCurrency,
} from '../interface';
import { parameters } from '../helpers';
import { AbstractConnector } from '../abstract-connector';

export class CoinbaseWalletConnect extends AbstractConnector {
  public connector: any;
  private chainID: number;
  private chainName: string;
  private nativeCurrency: INativeCurrency;
  private rpc: string;
  private blockExplorerUrl: string;

  /**
   * CoinbaseWalletConnect class to connect browser Coinbase Wallet extention to your application
   * using connect wallet.
   */

  constructor(network: INetwork) {
    super();
    this.chainID = network.chainID;
    if (network.chainName) this.chainName = network.chainName;
    if (network.nativeCurrency) this.nativeCurrency = network.nativeCurrency;
    if (network.rpc) this.rpc = network.rpc;
    if (network.blockExplorerUrl)
      this.blockExplorerUrl = network.blockExplorerUrl;
  }

  /**
   * Connect Coinbase Wallet browser. Create connection with connect
   * wallet and return provider for Web3.
   *
   * @returns return connect status and connect information with provider for Web3.
   * @example this.connect().then((connector: IConnectorMessage) => console.log(connector),(err: IConnectorMessage) => console.log(err));
   */
  public connect(provider: IProvider): Promise<IConnectorMessage> {
    return new Promise<any>((resolve, reject) => {
      if (typeof window.ethereum && window.coinbaseWalletExtension) {
        if (window.coinbaseWalletExtension.isCoinbaseWallet) {
          const coinbaseWallet = new CoinbaseWalletSDK({
            darkMode: false,
            appName: 'Amary Filo Connect Wallet',
            overrideIsMetaMask: true
          });
          const chain = parameters.chainsMap[parameters.chainIDMap[this.chainID]];

          this.connector = coinbaseWallet.makeWeb3Provider(
            provider.useProvider === 'rpc' ? provider.provider[provider.useProvider].rpc[this.chainID] : `https://${chain.name}.infura.io/v3/${provider.provider.infura.infuraId}`,
            this.chainID
          );

          resolve({
            code: 1,
            connected: true,
            provider: this.connector,
            message: {
              title: 'Success',
              subtitle: 'CoinbaseWallet Connect',
              text: `CoinbaseWallet found and connected.`,
            },
          } as IConnectorMessage);
        }

        reject({
          code: 2,
          connected: false,
          message: {
            title: 'Error',
            subtitle: 'Error connect',
            text: `CoinbaseWallet not found. Please install a wallet using an extension.`,
          },
        } as IConnectorMessage);
      }

      reject({
        code: 2,
        connected: false,
        message: {
          title: 'Error',
          subtitle: 'Error connect',
          text: `Ethereum not found. Please install a wallet using an extension.`,
        },
      } as IConnectorMessage);
    });
  }

  private ethRequestAccounts(): Promise<any> {
    return this.connector.enable();
  }

  public eventSubscriber(): Observable<IEvent | IEventError> {
    return new Observable((observer) => {
      this.connector.on('accountsChanged', (address: Array<any>) => {
        if (address.length) {
          observer.next({
            address: address[0],
            network: parameters.chainsMap[parameters.chainIDMap[+this.chainID]],
            name: 'accountsChanged',
          });
        } else {
          observer.error({
            code: 3,
            message: {
              title: 'Error',
              subtitle: 'Authorized error',
              text: 'You are not authorized.',
            },
          });
        }
      });
    });
  }

  private getChainId(): Promise<any> {
    return this.connector.request({ method: 'eth_chainId' });
  }

  private async checkNet(): Promise<any> {
    try {
      const currentChain = await this.getChainId();

      if (this.chainID !== parseInt(currentChain)) {
        try {
          await this.connector.request({
            method: 'wallet_switchEthereumChain',
            params: [{ chainId: `0x${this.chainID.toString(16)}` }],
          });
          return true;
        } catch (err: any) {
          if (err.code === 4902) {
            if (
              !this.chainName ||
              !this.nativeCurrency ||
              !this.rpc ||
              !this.blockExplorerUrl
            ) {
              return true;
            }
            try {
              await this.connector.request({
                method: 'wallet_addEthereumChain',
                params: [
                  {
                    chainId: `0x${this.chainID.toString(16)}`,
                    chainName: this.chainName,
                    nativeCurrency: this.nativeCurrency,
                    rpcUrls: [this.rpc],
                    blockExplorerUrls: [this.blockExplorerUrl],
                  },
                ],
              });
              return true;
            } catch (err) {
              throw new Error('user reject add chain');
            }
          }
          throw new Error(`user reject switch network`);
        }
      }
      return true;
    } catch (err) {
      throw new Error(err);
    }
  }

  /**
   * Get account address and chain information from Coinbase Wallet extention.
   *
   * @returns return an Observable array with data error or connected information.
   * @example this.getAccounts().subscribe((account: any)=> {console.log('account',account)});
   */
  public getAccounts(): Promise<any> {
    const error = {
      code: 3,
      message: {
        title: 'Error',
        subtitle: 'Authorized error',
        message: 'You are not authorized.',
      },
    };

    return new Promise((resolve, reject) => {
      this.checkNet()
        .then(() => {
          this.ethRequestAccounts()
            .then((accounts) => {
              if (accounts[0]) {
                this.connector
                  .request({
                    method: 'eth_chainId',
                  })
                  .then((chainID: string) => {
                    resolve({
                      address: accounts[0],
                      network:
                        parameters.chainsMap[parameters.chainIDMap[+chainID]],
                    });
                  });
              } else {
                reject(error);
              }
            })
            .catch(() => {
              reject({
                code: 3,
                message: {
                  title: 'Error',
                  subtitle: 'User rejected the request',
                  message: 'User rejected the connect',
                },
              });
            });
        })
        .catch((err: any) => {
          error.code = 4;
          error.message = err.message;
          reject(error);
        });
    });
  }
}