StakingContract

StakingContract is not a single contract but it is a complex mechanism of several contracts that linked between itselfs.
StakingContract allows to distributed tokens(tradedToken) by staking it for a period. Here and below we will call it ITR, like InTeRcoin token.
So user should:

• buy it for another erc20 token reserveToken like USDT, USDC or native coin ETH.
• stake it for a period(depends of pool) and obtain community coins(we call it ITRc like InTeRcoin community token.)
• unstake community coins after period passed to get tradedToken and reserveToken tokens with some fraction bonuses

Actually bonus will applied for ITRc. so user obtain additionally bonus ITRc and can unstake it, only paid for smth. but about this it will write below

StakingContract represented with two pools CommunityStakingPool and CommunityStakingPoolERC20, that can not be used simultaneously in one ComminityCoin scope The list of basic features:

• buy and stake tradedToken in the various ways describe below(see How to stake)
• unstake staked tokens after locked up period passed
• redeem tradedToken tokens in any time if have redeem role
• as owner of contract can applied bonuses, taxes and make ecosystem more flexible
• make manage most functions that happens on contract and revert it if necessary

Contracts

As said before StakingContract is a several contracts:

• CommunityCoinFactory.sol is a factory contract that can produce CommunityCoin by clone it from implementation
• CommunityCoin.sol is a template contract and ERC777 token ITRc. contract can produce staking pool.
• CommunityStakingPool.sol is a contract that represented pool. Pools are holders of LP tokens(Liquidity Pools)
• CommunityStakingPoolERC20.sol is a contract that represented pool too, but as opposed to staking pool there are no Uniswap interactions. Here just using ERC20 token to use as traded and reserved
• Rewards.sol - optional contract that implements IHook interface. Used for grant additional bonus of any token as the user more and more unstake ITRc.
• Taxes - optional contract that implements ITaxes interface. Used to correct amount of transfer ITRc tokens.

Interactions

Here we will describe main user cases like: stake, unstake, redeem, remove liquidity, etc.

Preparing to correct work

if using usual CommunityStakingPool then:

• make sure that in uniswap(pancakeSwap, etc) have exists necessary pairs, like [tradedToken]:[reserveToken], [reserveToken]:[WETH], [reserveToken]:[payingToken]

Steps to deploy

StakingContract is a complex of several contracts that linked between itselfs. We developed pattern that any produced instances use the same code deployed before and interact with it through DELEGATE_CALL. So any instance should be produced only by factory.
So deployed process contains from two steps:

1. Deploy implementations
   communityCoin.sol
communityStakingPoolFactory.sol
communityStakingPool.sol
communityStakingPoolErc20.sol
poolStakesLib.sol
   All contracts have proxy-based upgradeability system. so no constructors can be used in upgradeable contracts.
   example in ./scripts/deploy-implementations.js
2. Deploy factory deployed CommunityCoinFactory.sol with addresses of implementations deployed in the step before and Costmanager address that can be empty
   example in ./scripts/deploy.js

Steps to use

1. Need to create CommunityCoin To produce CommunityCoin instance user should call produce with params:

name	type	description
reserveToken	address	address of reserve token. like a WETH, USDT,USDC, etc.
tradedToken	address	address of traded token. For example the intercoin ITR token
hook	address	address of contract implemented IHook interface and used to calculation bonus tokens amount
discountSensitivity	uint256	value that manage amount tokens in redeem process. multiplied by FRACTION(10**5 by default)
communitySettings	tuple	tuple of community settings. see below

struct CommunitySettings

name	type	description
invitedByFraction	uint256	fraction(multiplied by FRACTION) that will get inviter when invited person do unstake operation
addr	address	address of community contract
redeemRoleId	uint8	users with this role can be able to redeem or redeem and remove liquidity
circulationRoleId	uint8	users with this role can call addToCirculation
tariffRoleId	uint8	users with this role can set tariffcall setComission

How to stake

There are several ways:

1. buyAndStakeLiquidity (via ETH)
   User send network coins(ETH,BNB,MATIC,etc) directly(or with payable method) into the CommunityStakingPool. Contract do following:

   • swap coins will converts into WrappedCoins(WETH).
   • swap WETH into reserveToken.
   • then using Formula#1 converts part of reserve tokens to traded to make sure that adding to liquidity happens without remainder.

   if uniswap pair [reserveToken]:[WETH] does not exists then transactions will revert.

2. buyAndStakeLiquidity (via paying token)
   User make ERC20::approve paying tokens into CommunityStakingPool contract and call buyAndStakeLiquidity.
   Contract do following:

   • swap paying tokens into reserveToken.
   • then using Formula#1 converts part of reserve tokens to traded to make sure that adding to liquidity happens without remainder.

   if uniswap pair [reserveToken]:[payingToken] does not exists then transactions will revert.

3. buyAndStakeLiquidity (via reserve token)
   User make ERC20::approve reserve tokens into CommunityStakingPool contract and call buyAndStakeLiquidity.
   Contract do following:

   • using Formula#1 converts part of reserve tokens to traded to make sure that adding to liquidity happens without remainder.

4. sellAndStakeLiquidity
   used in cases when user already have tradedToken but didn't get enough reserved tokens. So user make ERC20::approve traded tokens into CommunityStakingPool contract and call sellAndStakeLiquidity.

5. stakeLiquidity
   used in cases when user have already LP tokens. Could be obtained after unstake/redeem or transfered by another user. So user make the same as before: make ERC20::approve LP tokens into CommunityStakingPool contract and call sellAndStakeLiquidity.

6. addAndStakeLiquidity
   used in cases when user have traded and reserve tokens. So user make the same as before: make ERC20::approve both tokens into CommunityStakingPool contract and call addAndStakeLiquidity. Keep in mind that there are no calculation to add liquidity without remainder. If one of tokens fully consuming but other not, then all that left will refund to user back.

flowchart TB
WETH(convert coins to WETH)
reserveToken(convert to reserveToken)
doUniswap1(swap reserveToken to tradedToken partly)
doUniswap2(swap tradedToken to reserveToken partly)
PayingToken(PayingToken)
AddLiquidity(adding liquidity to Uniswap)
PoolObtainLP(Pool Obtained LP)
mintITRcAndReturnBackToUser(mint ITRc to user)
StakeLPDirectly( stake LP directly in a pool)
End[[end]]
subgraph Buy And Stake Logic
doUniswap1 --> AddLiquidity --> PoolObtainLP --> mintITRcAndReturnBackToUser
doUniswap2 --> AddLiquidity
StakeLPDirectly --> mintITRcAndReturnBackToUser
end

1[[1]] -.-> WETH --swap--> reserveToken --> doUniswap1 
2[[2]] -.-> PayingToken --swap--> reserveToken 
3[[3]] -.-> reserveToken 
4[[4]] -.-> doUniswap2
5[[5]] -.-> AddLiquidity 
6[[6]] -.-> StakeLPDirectly
mintITRcAndReturnBackToUser --> End

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How to unstake

Requirements:

• sender should have own unstakeable tokens. Means tokens should be no transferable to someone after staking. Thats tokens can be unstake after locked up period is passed.

So sender should approve tokens to CommunityCoin and call one of such methods:

• unstake(uint256 amount)
  in this case user will obtain tokens depends of pool :
  • LP tokens(if pool CommunityStakingPool)
  • erc20 tokens (if pool CommunityStakingPoolErc20)
• unstakeAndRemoveLiquidity(uint256 amount)
  in this case user will obtain tokens depends of pool:
  • traded and reserve tokens (if pool CommunityStakingPool)
  • erc20 tokens (if pool CommunityStakingPoolErc20)

[not completed]

How to redeem

Requirements:

• sender should have a role with Id redeemRoleId and have redeemable tokens. Means tokens should be transfer from someone. It's could be tokens that was transferred after staking and passed locked up period or could be transferred other redeemable tokens.

So sender should approve tokens to CommunityCoin and call one of such methods:

• redeem(uint256 amount) or
• redeem(uint256 amount, address[] memory preferredInstances)
  in this case user will obtain tokens depends of pool :
  • LP tokens(if pool CommunityStakingPool)
  • erc20 tokens (if pool CommunityStakingPoolErc20)
• redeemAndRemoveLiquidity(uint256 amount) or
• redeemAndRemoveLiquidity(uint256 amount, address[] memory preferredInstances)
  in this case user will obtain tokens depends of pool:
  • traded and reserve tokens (if pool CommunityStakingPool)
  • erc20 tokens (if pool CommunityStakingPoolErc20)

[not completed]

CommunityContract

using external Community Contract as a contraсt that checking users rights. Settings of Community Contract have pointed in CommunitySettings when producing CommunityCoin. (see "Step to use" section)

Bonuses

General information about bonuses. how, where, when.
There are several bonuses can be happens in system:

• invitedByFraction
  parameter, specified in CommunitySettings struct when producing a CommunityCoin. User obtain bonus tokens every time when invited user from community stakes tokens at any pools. Bonus tokens are locked up as usual tokens and spent(unlocked) first on every transfer
• bonusTokenFraction
  parameter, specified when creating a pool.
  User obtain bonus tokens every time when stakes tokens. Fraction can be different and depend of pool. Bonus tokens are locked up as usual tokens and spent(unlocked) first on every transfer
• addToCirculation
  direct way to add tokens to recipient. Initiator should have a role with id circulationRoleId . Bonus tokens are not locked. and behave not as bonus tokens. It's like inflation tokens.
• Rewards
  Additional way to get bonus (traded)tokens is defined hook contract, which can be triggered in every unstake operation. Hook contract is a fund contract that can accomulate tokens unstaked by user and claim to user when overall amount exceed threshold defined in rewardsContract. It's really separate way to get bonus. it can be ITR or ITRc or any other erc20 tokens. RewardsContract can send any tokens and implement any different logic.

Taxes

There are couple of taxes applied in system:

tax	description	when applied
discountSensitivity	see Formula#2. setup through produced CommunityCoin	every transfer
inflation tax	see Formula#3. autocalculated and depend of inflation tokens	every transfer
Tariffs	var unstakeTariff and redeemTariff can be set by owner	unstake / redeem
taxHook	if external taxHook contract are present then in any transfer it can adjust transferred amount up or down. But not more then MAX_BOOST or not less then MAX_TAX fractions respectively.	in every transfer
lpFraction	reducing LP tokens by lpFraction tax in pool(not erc20pool)	unstake/redeem

Limit for taxes (multiple by fraction = 100000)

name	value	description
MAX_UNSTAKE_TARIFF	10000	10%
MAX_REDEEM_TARIFF	10000	10%
MAX_TAX	10000	10%
MAX_BOOST	10000	10%

[in progress]

Formulas

Formula#1.

How much tokens need to swap from one reserve to get another and fully added to liquidity without remainder

Where:
r1 - reserve at uniswap(reserve side 1)
r2 - incoming amount of reserve(side 1) token
r3 - tokens amount from reserve side1 that need to use `swapExactTokensForTokens`

Formula#2.

How tokens calculated with circulation tokens present

Where:
totalReserves - tokens over all pools but without bonuses and inflation tokens
totalSupply - tokens over all pools

Formula#3.

ratio with discount sensitivity