Fix native investment (#2123)

# Summary

Fixing bug with Native investment

Example of a successful claim using ETH https://rinkeby.etherscan.io/tx/0x63b9138efd234380362babc8bb2e6566750a2e9ea83ce10fe9b4862c6ad31f0f

The issue was that `parseUnits` adds X zeroes to the value passed in, but what I wanted is to remove them.
Switched back to JSBI.divide by 10**18 and now it gives us the proper amount :)

# Test

1. On rinkeby, connect your account and go to the claim page
2. Pick one account from the list below and check for the balance
3. If it has not been claimed yet, you should be able to claim it now :)
4. Trigger the claim - make sure you have the required amount of ETH + gas costs
* Your ETH claim should go through without issues

**Notes** this change might break the investor flow. I can revert that, it's on only to make sure the claiming is working

# Accounts

I filtered this list based on accounts that ONLY have ETH claims to make sure you don't need anything else (GNO/USDC)

- 0xb5434A86d09144da8854D1c40e3Cc54d78738695
- 0x9B827cc7Af79d71A2ca0f75343754935BfaF92D3
- 0x5d42D4Cd8B9D6141B1084E8eAD92e8F76b08705E
- 0x3320b6c454d0361dd3dF4912e8a06F3C945b8C60
- 0xCe0E37Bf2fC4B5c14D881f36712efB5Dcee203E8
- 0x030905cc078F3c71434fea1175615Bcc2c91FEf8
- 0xb0fE1FcEC3fE9f16c984b7A5668DF89bc7592B9D
- 0x6aBBaD8bd6Aced3649d52DFd32d2Ee04f3BE4aFB
- 0xF925FDd0de74d75Dd9C71095865c1511863092a9
- 0x26bC2B4D5DA4dc437F581AEFf490E2DdDa0aCFAa
- 0xA78266E26a6087566b17C64dE1Ed1D9533E1B36b
- 0x3877f08a4b722F48345B0e771c579fF335B533DA
- 0x1F1430C14595442c683cF3d3033a726ADecd6179
- 0xD5a0a16AA1ed668c45b29E905bafcb76C21a90BA
- 0xE6EA6d415e7Cb32bee6Db8Ad03e3749FEF23c9cd
- 0x3011862E85dDf0851f651E7d04e61e97E20a65CF
- 0x7f43A4C9E787Ba6A270e67b0D1bE77263cc47a08
- 0xCD2802122F04265791A3E4568A3f24BD1Df821a2
- 0x050f5403EB197DdE4BFE07da6e4aDE19A22db00B
- 0xe05206Ba64e59bF94c3dc3E1775Ec3FE04c33D08
- 0xC8249FB3b37fF0788462F1d20263ae373fbe68BB
- 0x01A72692ffE0A80029DE7982227A186F2787046f
- 0xDb3a676b8Eb7dBBC43b68C7Fb149f565343e850C

src/custom/state/claim/hooks/index.ts

@@ -77,6 +77,9 @@ export const USDC_PRICE = '150000' // '0.15' USDC (6 decimals) per vCOW, in atom
 const TWO_WEEKS = ms`2 weeks`
 const SIX_WEEKS = ms`6 weeks`
 
+// For native token price calculation
+const DENOMINATOR = JSBI.exponentiate(JSBI.BigInt(10), JSBI.BigInt(18))
+
 export enum ClaimType {
   Airdrop, // free, no vesting, can be available on both mainnet and gchain
   GnoOption, // paid, with vesting, must use GNO, can be available on both mainnet and gchain
@@ -434,7 +437,7 @@ export function useClaimCallback(account: string | null | undefined): {
 
       const vCowAmount = CurrencyAmount.fromRawAmount(vCowToken, totalClaimedAmount)
 
-      return vCowContract.estimateGas['claimMany'](...args).then((estimatedGas) => {
+      return vCowContract.estimateGas.claimMany(...args).then((estimatedGas) => {
         // Last item in the array contains the call overrides
         const extendedArgs = _extendFinalArg(args, {
           from: connectedAccount, // add the `from` as the connected account
@@ -541,6 +544,7 @@ function _getClaimManyArgs({
   })
 
   const value = totalValue.toString() === '0' ? undefined : totalValue.toString()
+
   const args: GetClaimManyArgsResult['args'] =
     indices.length > 0
       ? [indices, claimTypes, claimants, claimableAmounts, claimedAmounts, merkleProofs, sendEth, { value }]
@@ -619,9 +623,11 @@ function _getClaimValue(claim: UserClaimData, vCowAmount: string, chainId: Suppo
 
   const price = NATIVE_TOKEN_PRICE[chainId]
 
-  const claimValueInAtoms = JSBI.multiply(JSBI.BigInt(vCowAmount), JSBI.BigInt(price))
-
-  return parseUnits(claimValueInAtoms.toString(), 18).toString()
+  // Why InAtomsSquared? because we are multiplying vCowAmount (which is in atoms == * 10**18)
+  // by the price (which is also in atoms == * 10**18)
+  const claimValueInAtomsSquared = JSBI.multiply(JSBI.BigInt(vCowAmount), JSBI.BigInt(price))
+  // Then it's divided by 10**18 to return the value in the native currency atoms
+  return JSBI.divide(claimValueInAtomsSquared, DENOMINATOR).toString()
 }
 
 type LastAddress = string