# Calculate Homora V2 pending rewards

## MasterChef
We calculate the rewards depending on dex and their staking contract version.

The concept is that we get
- `collateralSize`, `collId` from `homoraBank.positionInfo(positionId)`
- `entryRewardPerShare` from the last 240 bits of `collId`
- `poolInfo` / `userInfo` from `masterChefContract.poolInfo(pool.pid, pool.wTokenAddress)`
- `pendingReward` / `pendingToken` / `pending…` from `masterChefContract.pendingReward(pool.pid, pool.wTokenAddress)`

Then we calculate reward by

const pendingRewardsPerShare = pendingRewards.times('1e18').div(poolInfo.amount)
const rewardAmount = collateralSize
            .times(accRewardPerShare.minus(entryRewardPerShare).plus(pendingRewardsPerShare))
            .div(`1e${rewardDecimals}`)
            .div('1e12') // Depending on each dex

### Example

case WTokenType.WMasterChefJoeV3:
    const [_accJoePerShare, _userInfo, _pendingTokens, joeDecimals] = await makeMulticall([
            wMasterChefJoeV3Contract.methods.accJoePerShare(),
            masterChefJoeV3Contract.methods.userInfo(pool.pid, pool.wTokenAddress),
            masterChefJoeV3Contract.methods.pendingTokens(pool.pid, pool.wTokenAddress),
            rewardErc20Contract.methods.decimals(),
          ])
    
    const accJoePerShare = new BigNumber(_accJoePerShare)
    const userPendingJoe = new BigNumber(_pendingTokens?.pendingJoe).times('1e18').div(_userInfo?.amount)

    rewardAmount = collSize
            .times(accJoePerShare.minus(entryRewardPerShare).plus(userPendingJoe))
            .div('1e18')
            .div(`1e${joeDecimals}`)

## Curve

const wLiquidityGaugeContract = contractService.getContract(wLiquidityGaugeJson.abi, pool.wTokenAddress)
const { accCrvPerShare } = await wLiquidityGaugeContract.methods.gauges(pool.pid, pool.gid).call()

const rewardAmount = collateralSize
  .times(accCrvPerShare.minus(entryRewardPerShare))
  .div(`1e${crvDecimals}`)
  .div('1e18')