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51 lines
2.0 KiB
51 lines
2.0 KiB
4 years ago
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import { useSelector } from 'react-redux'
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import { getSelectedAccount } from '../selectors'
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import { ETH_SWAPS_TOKEN_OBJECT } from '../helpers/constants/swaps'
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import { getValueFromWeiHex, hexToDecimal } from '../helpers/utils/conversions.util'
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/**
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* @typedef {Object} SwapsEthToken
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* @property {string} symbol - The symbol for ETH, namely "ETH"
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* @property {string} name - The name of the ETH currency, "Ether"
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* @property {string} address - A substitute address for the metaswap-api to
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* recognize the ETH token
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* @property {string} decimals - The number of ETH decimals, i.e. 18
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* @property {string} balance - The user's ETH balance in decimal wei, with a
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* precision of 4 decimal places
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* @property {string} string - The user's ETH balance in decimal ETH
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*/
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/**
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* Swaps related code uses token objects for various purposes. These objects
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* always have the following properties: `symbol`, `name`, `address`, and
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* `decimals`.
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*
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* When available for the current account, the objects can have `balance` and
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* `string` properties.
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* `balance` is the users token balance in decimal values, denominated in the
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* minimal token units (according to its decimals).
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* `string` is the token balance in a readable format, ready for rendering.
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*
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* Swaps treats ETH as a token, and we use the ETH_SWAPS_TOKEN_OBJECT constant
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* to set the standard properties for the token. The useSwapsEthToken hook
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* extends that object with `balance` and `balance` values of the same type as
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* in regular ERC-20 token objects, per the above description.
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*
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* @returns {SwapsEthToken} The token object representation of the currently
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* selected account's ETH balance, as expected by the Swaps API.
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*/
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export function useSwapsEthToken () {
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const selectedAccount = useSelector(getSelectedAccount)
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const { balance } = selectedAccount
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return {
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...ETH_SWAPS_TOKEN_OBJECT,
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balance: hexToDecimal(balance),
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string: getValueFromWeiHex({
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value: balance,
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numberOfDecimals: 4,
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toDenomination: 'ETH',
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}),
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}
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}
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