import BN from 'bn.js';
import { buffers, delay } from 'redux-saga';
import {
  call,
  select,
  put,
  take,
  apply,
  actionChannel,
  race,
  cancel,
  fork
} from 'redux-saga/effects';
import { cloneableGenerator, SagaIteratorClone, createMockTask } from 'redux-saga/utils';

import { Wei, Nonce } from 'libs/units';
import { makeTransaction, getTransactionFields } from 'libs/transaction';
import * as derivedSelectors from 'features/selectors';
import * as configMetaTypes from 'features/config/meta/types';
import * as configMetaSelectors from 'features/config/meta/selectors';
import * as configNodesSelectors from 'features/config/nodes/selectors';
import { walletTypes, walletSelectors } from 'features/wallet';
import { scheduleActions, scheduleSelectors } from 'features/schedule';
import { notificationsActions } from 'features/notifications';
import { transactionFieldsTypes, transactionFieldsActions } from '../fields';
import * as transactionTypes from '../types';
import * as types from './types';
import * as actions from './actions';
import * as sagas from './sagas';

describe('Network Sagas', () => {
  describe('From', () => {
    describe('handleFromRequest*', () => {
      const walletInst: any = {
        getAddressString: jest.fn()
      };
      const fromAddress = '0xa';
      const gens: any = {};
      gens.gen = cloneableGenerator(sagas.handleFromRequest)();
      let random: () => number;

      beforeAll(() => {
        random = Math.random;
        Math.random = () => 0.001;
      });

      afterAll(() => {
        Math.random = random;
      });

      it('should select getWalletInst', () => {
        expect(gens.gen.next().value).toEqual(select(walletSelectors.getWalletInst));
      });

      it('should handle errors as expected', () => {
        gens.clone = gens.gen.clone();
        expect(gens.clone.next(false).value).toEqual(
          put(
            notificationsActions.showNotification(
              'warning',
              'Your wallets address could not be fetched'
            )
          )
        );
        expect(gens.clone.next().value).toEqual(put(actions.getFromFailed()));
        expect(gens.clone.next().done).toEqual(true);
      });

      it('should apply walletInst.getAddress', () => {
        expect(gens.gen.next(walletInst).value).toEqual(
          apply(walletInst, walletInst.getAddressString)
        );
      });

      it('should put getFromSucceeded', () => {
        expect(gens.gen.next(fromAddress).value).toEqual(
          put(actions.getFromSucceeded(fromAddress))
        );
      });
    });
  });
  describe('Gas', () => {
    describe('shouldEstimateGas*', () => {
      const offline = false;
      const autoGasLimitEnabled = true;
      const addressMessage = undefined;
      const transaction: any = 'transaction';
      const tx = { transaction };
      const rest: any = {
        mock1: 'mock1',
        mock2: 'mock2'
      };
      const transactionFields = {
        gasLimit: 'gasLimit',
        gasPrice: 'gasPrice',
        nonce: 'nonce',
        chainId: 'chainId',
        ...rest
      };
      const action: any = {
        type: transactionFieldsTypes.TransactionFieldsActions.TO_FIELD_SET,
        payload: {
          value: 'value',
          raw: 'raw'
        }
      };

      const gen = sagas.shouldEstimateGas();

      it('should take expected types', () => {
        expect(gen.next().value).toEqual(
          take([
            transactionFieldsTypes.TransactionFieldsActions.TO_FIELD_SET,
            transactionFieldsTypes.TransactionFieldsActions.VALUE_FIELD_SET,
            transactionFieldsTypes.TransactionFieldsActions.DATA_FIELD_SET,
            transactionTypes.TransactionActions.ETHER_TO_TOKEN_SWAP,
            transactionTypes.TransactionActions.TOKEN_TO_TOKEN_SWAP,
            transactionTypes.TransactionActions.TOKEN_TO_ETHER_SWAP,
            configMetaTypes.CONFIG_META.TOGGLE_AUTO_GAS_LIMIT
          ])
        );
      });

      it('should select getOffline', () => {
        expect(gen.next(action).value).toEqual(select(configMetaSelectors.getOffline));
      });

      it('should select autoGasLimitEnabled', () => {
        expect(gen.next(offline).value).toEqual(select(configMetaSelectors.getAutoGasLimitEnabled));
      });

      it('should select getCurrentToAddressMessage', () => {
        expect(gen.next(autoGasLimitEnabled).value).toEqual(
          select(derivedSelectors.getCurrentToAddressMessage)
        );
      });

      it('should select getTransaction', () => {
        expect(gen.next(addressMessage).value).toEqual(select(derivedSelectors.getTransaction));
      });

      it('should call getTransactionFields with transaction', () => {
        expect(gen.next(tx).value).toEqual(call(getTransactionFields, transaction));
      });

      it('should put estimatedGasRequested with rest', () => {
        expect(gen.next(transactionFields).value).toEqual(put(actions.estimateGasRequested(rest)));
      });
    });

    describe('estimateGas*', () => {
      const offline = false;
      const autoGasLimitEnabled = true;
      const requestChan = 'requestChan';
      const payload: any = {
        mock1: 'mock1',
        mock2: 'mock2'
      };
      const action = { payload };
      const node: any = {
        estimateGas: jest.fn()
      };
      const walletInst: any = {
        getAddressString: jest.fn()
      };
      const from = '0xa';
      const txObj = { ...payload, from };
      const gasLimit = Wei('100');
      const successfulGasEstimationResult = {
        gasLimit
      };

      const unsuccessfulGasEstimationResult = {
        gasLimit: null
      };
      const gasSetOptions = {
        raw: gasLimit.toString(),
        value: gasLimit
      };

      const gens: { [name: string]: any } = {};
      gens.successCase = cloneableGenerator(sagas.estimateGas)();

      let random: () => number;
      beforeAll(() => {
        random = Math.random;
        Math.random = () => 0.001;
      });

      afterAll(() => {
        Math.random = random;
      });

      it('should yield actionChannel', () => {
        const expected = JSON.stringify(
          actionChannel(types.TransactionNetworkActions.ESTIMATE_GAS_REQUESTED, buffers.sliding(1))
        );
        const result = JSON.stringify(gens.successCase.next().value);
        expect(expected).toEqual(result);
      });

      it('should select autoGasLimit', () => {
        expect(gens.successCase.next(requestChan).value).toEqual(
          select(configMetaSelectors.getAutoGasLimitEnabled)
        );
      });

      it('should select getOffline', () => {
        expect(gens.successCase.next(autoGasLimitEnabled).value).toEqual(
          select(configMetaSelectors.getOffline)
        );
      });

      it('should take requestChan', () => {
        expect(gens.successCase.next(offline).value).toEqual(take(requestChan));
      });

      it('should call delay', () => {
        expect(gens.successCase.next(action).value).toEqual(call(delay, 250));
      });

      it('should select getNodeLib', () => {
        expect(gens.successCase.next().value).toEqual(select(configNodesSelectors.getNodeLib));
      });

      it('should select getWalletInst', () => {
        expect(gens.successCase.next(node).value).toEqual(select(walletSelectors.getWalletInst));
      });

      it('should apply walletInst', () => {
        expect(gens.successCase.next(walletInst).value).toEqual(
          apply(walletInst, walletInst.getAddressString)
        );
      });

      it('should race between node.estimate gas and a 10 second timeout', () => {
        gens.failCase = gens.successCase.clone();
        expect(gens.successCase.next(from).value).toEqual(
          race({
            gasLimit: apply(node, node.estimateGas, [txObj]),
            timeout: call(delay, 10000)
          })
        );
      });

      it('should select isSchedulingEnabled', () => {
        gens.timeOutCase = gens.successCase.clone();
        expect(gens.successCase.next(successfulGasEstimationResult).value).toEqual(
          select(scheduleSelectors.isSchedulingEnabled)
        );
      });

      it('should put setGasLimitField', () => {
        gens.scheduleCase = gens.successCase.clone();
        const notScheduling = null as any;
        expect(gens.successCase.next(notScheduling).value).toEqual(
          put(transactionFieldsActions.setGasLimitField(gasSetOptions))
        );
      });

      it('should put setScheduleGasLimitField', () => {
        const scheduling = { value: true } as any;
        expect(gens.scheduleCase.next(scheduling).value).toEqual(
          put(scheduleActions.setScheduleGasLimitField(gasSetOptions))
        );
      });

      it('should put estimateGasSucceeded', () => {
        expect(gens.successCase.next().value).toEqual(put(actions.estimateGasSucceeded()));
      });

      describe('when it times out', () => {
        it('should put estimateGasTimedout ', () => {
          expect(gens.timeOutCase.next(unsuccessfulGasEstimationResult).value).toEqual(
            put(actions.estimateGasTimedout())
          );
        });
        it('should call localGasEstimation', () => {
          expect(gens.timeOutCase.next(actions.estimateGasFailed()).value).toEqual(
            call(sagas.localGasEstimation, payload)
          );
        });
      });

      describe('when it throws', () => {
        it('should catch and put estimateGasFailed', () => {
          expect(gens.failCase.throw().value).toEqual(put(actions.estimateGasFailed()));
        });

        it('should call localGasEstimation', () => {
          expect(gens.failCase.next(actions.estimateGasFailed()).value).toEqual(
            call(sagas.localGasEstimation, payload)
          );
        });
      });
    });

    describe('localGasEstimation', () => {
      const payload: any = {
        mock1: 'mock1',
        mock2: 'mock2'
      };
      const tx = {
        getBaseFee: jest.fn()
      };
      const gasLimit = Wei('100');

      const gen = sagas.localGasEstimation(payload);
      it('should call makeTransaction with payload', () => {
        expect(gen.next().value).toEqual(call(makeTransaction, payload));
      });

      it('should apply tx.getBaseFee', () => {
        expect(gen.next(tx).value).toEqual(apply(tx, tx.getBaseFee));
      });

      it('should put setGasLimitField', () => {
        expect(gen.next(gasLimit).value).toEqual(
          put(
            transactionFieldsActions.setGasLimitField({
              raw: gasLimit.toString(),
              value: gasLimit
            })
          )
        );
      });
    });

    describe('setAddressMessageGasLimit*', () => {
      const gens = cloneableGenerator(sagas.setAddressMessageGasLimit)();
      const gen = gens.clone();
      let noAutoGen: SagaIteratorClone;
      let noMessageGen: SagaIteratorClone;
      const addressMessage = {
        gasLimit: 123456,
        msg: 'Thanks for donating, er, investing in SCAM'
      };

      it('should select getAutoGasLimitEnabled', () => {
        expect(gen.next().value).toEqual(select(configMetaSelectors.getAutoGasLimitEnabled));
      });

      it('should select getCurrentToAddressMessage', () => {
        noAutoGen = gen.clone();
        expect(gen.next(true).value).toEqual(select(derivedSelectors.getCurrentToAddressMessage));
      });

      it('should put setGasLimitField', () => {
        noMessageGen = gen.clone();
        expect(gen.next(addressMessage).value).toEqual(
          put(
            transactionFieldsActions.setGasLimitField({
              raw: addressMessage.gasLimit.toString(),
              value: new BN(addressMessage.gasLimit)
            })
          )
        );
      });

      it('should do nothing if getAutoGasLimitEnabled is false', () => {
        noAutoGen.next(false);
        expect(noAutoGen.next(addressMessage).done).toBeTruthy();
      });

      it('should do nothing if getCurrentToAddressMessage is undefined', () => {
        expect(noMessageGen.next(undefined).done).toBeTruthy();
      });
    });
  });
  describe('Nonce', () => {
    describe('handleNonceRequest*', () => {
      const nodeLib = {
        getTransactionCount: jest.fn()
      };
      const walletInst = {
        getAddressString: jest.fn()
      };
      const offline = false;
      const fromAddress = 'fromAddress';
      const retrievedNonce = '0xa';
      const base10Nonce = Nonce(retrievedNonce);

      const gens: any = {};
      gens.gen = cloneableGenerator(sagas.handleNonceRequest)();
      let random: () => number;

      beforeAll(() => {
        random = Math.random;
        Math.random = () => 0.001;
      });

      afterAll(() => {
        Math.random = random;
      });

      it('should select getNodeLib', () => {
        expect(gens.gen.next().value).toEqual(select(configNodesSelectors.getNodeLib));
      });

      it('should select getWalletInstance', () => {
        expect(gens.gen.next(nodeLib).value).toEqual(select(walletSelectors.getWalletInst));
      });

      it('should exit if being called without a wallet inst', () => {
        gens.noWallet = gens.gen.clone();
        gens.noWallet.next(null); // No wallet inst
        expect(gens.noWallet.next(offline).done).toEqual(true);
      });

      it('should select getOffline', () => {
        expect(gens.gen.next(walletInst).value).toEqual(select(configMetaSelectors.getOffline));
      });

      it('should exit if being called while offline', () => {
        gens.offline = gens.gen.clone();
        expect(gens.offline.next(true).done).toEqual(true);
      });

      it('should apply walletInst.getAddressString', () => {
        expect(gens.gen.next(offline).value).toEqual(
          apply(walletInst, walletInst.getAddressString)
        );
      });

      it('should apply nodeLib.getTransactionCount', () => {
        expect(gens.gen.next(fromAddress).value).toEqual(
          apply(nodeLib, nodeLib.getTransactionCount, [fromAddress])
        );
      });

      it('should put inputNonce', () => {
        expect(gens.gen.next(retrievedNonce).value).toEqual(
          put(transactionFieldsActions.inputNonce(base10Nonce.toString()))
        );
      });

      it('should put getNonceSucceeded', () => {
        expect(gens.gen.next().value).toEqual(put(actions.getNonceSucceeded(retrievedNonce)));
      });
    });

    describe('handleNonceRequestWrapper*', () => {
      const gen = sagas.handleNonceRequestWrapper();
      const nonceRequest = createMockTask();

      it('should fork handleNonceRequest', () => {
        expect(gen.next().value).toEqual(fork(sagas.handleNonceRequest));
      });

      it('should take on WALLET_SET', () => {
        expect(gen.next(nonceRequest).value).toEqual(take(walletTypes.WalletActions.SET));
      });

      it('should cancel nonceRequest', () => {
        expect(gen.next().value).toEqual(cancel(nonceRequest));
      });

      it('should be done', () => {
        expect(gen.next().done).toEqual(true);
      });
    });
  });
});