MyCrypto/common/reducers/swap.js

101 lines
2.4 KiB
JavaScript

import {
SWAP_DESTINATION_AMOUNT,
SWAP_DESTINATION_KIND,
SWAP_ORIGIN_AMOUNT,
SWAP_ORIGIN_KIND,
SWAP_UPDATE_BITY_RATES
} from 'actions/swapConstants';
import { combineAndUpper } from 'api/bity';
export const ALL_CRYPTO_KIND_OPTIONS = ['BTC', 'ETH', 'REP'];
const initialState = {
originAmount: 0,
destinationAmount: 0,
originKind: 'BTC',
destinationKind: 'ETH',
destinationKindOptions: ALL_CRYPTO_KIND_OPTIONS.filter(
element => element !== 'BTC'
),
originKindOptions: ALL_CRYPTO_KIND_OPTIONS.filter(
element => element !== 'REP'
),
bityRates: {}
};
const buildDestinationAmount = (
originAmount,
originKind,
destinationKind,
bityRates
) => {
let pairName = combineAndUpper(originKind, destinationKind);
let bityRate = bityRates[pairName];
return originAmount * bityRate;
};
const buildDestinationKind = (originKind, destinationKind) => {
if (originKind === destinationKind) {
return ALL_CRYPTO_KIND_OPTIONS.filter(element => element !== originKind)[0];
} else {
return destinationKind;
}
};
export function swap(state = initialState, action) {
switch (action.type) {
case SWAP_ORIGIN_KIND: {
const newDestinationKind = buildDestinationKind(
action.value,
state.destinationKind
);
return {
...state,
originKind: action.value,
destinationKind: newDestinationKind,
destinationKindOptions: ALL_CRYPTO_KIND_OPTIONS.filter(
element => element !== action.value
),
destinationAmount: buildDestinationAmount(
state.originAmount,
action.value,
newDestinationKind,
state.bityRates
)
};
}
case SWAP_DESTINATION_KIND: {
return {
...state,
destinationKind: action.value,
destinationAmount: buildDestinationAmount(
state.originAmount,
state.originKind,
action.value,
state.bityRates
)
};
}
case SWAP_ORIGIN_AMOUNT:
return {
...state,
originAmount: action.value
};
case SWAP_DESTINATION_AMOUNT:
return {
...state,
destinationAmount: action.value
};
case SWAP_UPDATE_BITY_RATES:
return {
...state,
bityRates: {
...state.bityRates,
...action.value
}
};
default:
return state;
}
}