import * as actionConstants from '../../store/actionConstants';
import { ALERT_TYPES } from '../../../shared/constants/alerts';
import { NETWORK_TYPE_RPC } from '../../../shared/constants/network';
import {
  accountsWithSendEtherInfoSelector,
  getAddressBook,
} from '../../selectors';

export default function reduceMetamask(state = {}, action) {
  const metamaskState = {
    isInitialized: false,
    isUnlocked: false,
    isAccountMenuOpen: false,
    identities: {},
    unapprovedTxs: {},
    frequentRpcList: [],
    addressBook: [],
    contractExchangeRates: {},
    tokens: [],
    pendingTokens: {},
    customNonceValue: '',
    useBlockie: false,
    featureFlags: {},
    welcomeScreenSeen: false,
    currentLocale: '',
    currentBlockGasLimit: '',
    preferences: {
      autoLockTimeLimit: undefined,
      showFiatInTestnets: false,
      useNativeCurrencyAsPrimaryCurrency: true,
    },
    firstTimeFlowType: null,
    completedOnboarding: false,
    knownMethodData: {},
    participateInMetaMetrics: null,
    nextNonce: null,
    conversionRate: null,
    nativeCurrency: 'ETH',
    ...state,
  };

  switch (action.type) {
    case actionConstants.UPDATE_METAMASK_STATE:
      return { ...metamaskState, ...action.value };

    case actionConstants.LOCK_METAMASK:
      return {
        ...metamaskState,
        isUnlocked: false,
      };

    case actionConstants.SET_RPC_TARGET:
      return {
        ...metamaskState,
        provider: {
          type: NETWORK_TYPE_RPC,
          rpcUrl: action.value,
        },
      };

    case actionConstants.SET_PROVIDER_TYPE:
      return {
        ...metamaskState,
        provider: {
          type: action.value,
        },
      };

    case actionConstants.SHOW_ACCOUNT_DETAIL:
      return {
        ...metamaskState,
        isUnlocked: true,
        isInitialized: true,
        selectedAddress: action.value,
      };

    case actionConstants.SET_ACCOUNT_LABEL: {
      const { account } = action.value;
      const name = action.value.label;
      const id = {};
      id[account] = { ...metamaskState.identities[account], name };
      const identities = { ...metamaskState.identities, ...id };
      return Object.assign(metamaskState, { identities });
    }

    case actionConstants.UPDATE_TOKENS:
      return {
        ...metamaskState,
        tokens: action.newTokens,
      };

    case actionConstants.UPDATE_CUSTOM_NONCE:
      return {
        ...metamaskState,
        customNonceValue: action.value,
      };

    case actionConstants.TOGGLE_ACCOUNT_MENU:
      return {
        ...metamaskState,
        isAccountMenuOpen: !metamaskState.isAccountMenuOpen,
      };

    case actionConstants.UPDATE_TRANSACTION_PARAMS: {
      const { id: txId, value } = action;
      let { currentNetworkTxList } = metamaskState;
      currentNetworkTxList = currentNetworkTxList.map((tx) => {
        if (tx.id === txId) {
          const newTx = { ...tx };
          newTx.txParams = value;
          return newTx;
        }
        return tx;
      });

      return {
        ...metamaskState,
        currentNetworkTxList,
      };
    }

    case actionConstants.SET_PARTICIPATE_IN_METAMETRICS:
      return {
        ...metamaskState,
        participateInMetaMetrics: action.value,
      };

    case actionConstants.SET_USE_BLOCKIE:
      return {
        ...metamaskState,
        useBlockie: action.value,
      };

    case actionConstants.UPDATE_FEATURE_FLAGS:
      return {
        ...metamaskState,
        featureFlags: action.value,
      };

    case actionConstants.CLOSE_WELCOME_SCREEN:
      return {
        ...metamaskState,
        welcomeScreenSeen: true,
      };

    case actionConstants.SET_CURRENT_LOCALE:
      return {
        ...metamaskState,
        currentLocale: action.value.locale,
      };

    case actionConstants.SET_PENDING_TOKENS:
      return {
        ...metamaskState,
        pendingTokens: { ...action.payload },
      };

    case actionConstants.CLEAR_PENDING_TOKENS: {
      return {
        ...metamaskState,
        pendingTokens: {},
      };
    }

    case actionConstants.UPDATE_PREFERENCES: {
      return {
        ...metamaskState,
        preferences: {
          ...metamaskState.preferences,
          ...action.payload,
        },
      };
    }

    case actionConstants.COMPLETE_ONBOARDING: {
      return {
        ...metamaskState,
        completedOnboarding: true,
      };
    }

    case actionConstants.SET_FIRST_TIME_FLOW_TYPE: {
      return {
        ...metamaskState,
        firstTimeFlowType: action.value,
      };
    }

    case actionConstants.SET_NEXT_NONCE: {
      return {
        ...metamaskState,
        nextNonce: action.value,
      };
    }

    default:
      return metamaskState;
  }
}

export const getCurrentLocale = (state) => state.metamask.currentLocale;

export const getAlertEnabledness = (state) => state.metamask.alertEnabledness;

export const getUnconnectedAccountAlertEnabledness = (state) =>
  getAlertEnabledness(state)[ALERT_TYPES.unconnectedAccount];

export const getWeb3ShimUsageAlertEnabledness = (state) =>
  getAlertEnabledness(state)[ALERT_TYPES.web3ShimUsage];

export const getUnconnectedAccountAlertShown = (state) =>
  state.metamask.unconnectedAccountAlertShownOrigins;

export const getTokens = (state) => state.metamask.tokens;

export function getBlockGasLimit(state) {
  return state.metamask.currentBlockGasLimit;
}

export function getConversionRate(state) {
  return state.metamask.conversionRate;
}

export function getNativeCurrency(state) {
  return state.metamask.nativeCurrency;
}

export function getSendHexDataFeatureFlagState(state) {
  return state.metamask.featureFlags.sendHexData;
}

export function getSendToAccounts(state) {
  const fromAccounts = accountsWithSendEtherInfoSelector(state);
  const addressBookAccounts = getAddressBook(state);
  return [...fromAccounts, ...addressBookAccounts];
}

export function getUnapprovedTxs(state) {
  return state.metamask.unapprovedTxs;
}

export function isEIP1559Network(state) {
  return state.metamask.networkDetails.EIPS[1559] === true;
}