library Constants {
    /* Chain */
    uint256 private constant CHAIN_ID = 1; // Mainnet

    /* Bootstrapping */
    // QSD #3
    uint256 private constant BOOTSTRAPPING_PERIOD = 72;
    uint256 private constant BOOTSTRAPPING_PRICE = 11e17; // 1.10 DAI

    /* Oracle */
    address private constant DAI = address(0x6B175474E89094C44Da98b954EedeAC495271d0F);
    uint256 private constant ORACLE_RESERVE_MINIMUM = 10000e18; // 10,000 DAI

    /* Bonding */
    uint256 private constant INITIAL_STAKE_MULTIPLE = 1e6; // 100 ESD -> 100M ESDS

    /* Epoch */
    struct EpochStrategy {
        uint256 offset;
        uint256 start;
        uint256 period;
    }

    uint256 private constant PREVIOUS_EPOCH_OFFSET = 0;
    uint256 private constant PREVIOUS_EPOCH_START = 0;
    uint256 private constant PREVIOUS_EPOCH_PERIOD = 0;

    // QSD #1
    uint256 private constant CURRENT_EPOCH_OFFSET = 0;
    uint256 private constant CURRENT_EPOCH_START =  1612008000;// 2020/01/30 12:00 UTC;
    uint256 private constant CURRENT_EPOCH_PERIOD = 14400; // 4 hours

    /* Governance */
    // QSD #C.a
    uint256 private constant GOVERNANCE_MAX_SUPPLY = 999999999e18; // 999,999,999
    uint256 private constant GOVERNANCE_DISTRIBUTED_PER_BLOCK = 9e16; // 0.09

    // QSD #C.g
    uint256 private constant GOVERNANCE_PERIOD = 9; // 9 epochs
    uint256 private constant GOVERNANCE_EXPIRATION = 2; // 2 + 1 epochs
    uint256 private constant GOVERNANCE_QUORUM = 33e16; // 33%
    uint256 private constant GOVERNANCE_PROPOSAL_THRESHOLD = 9e15; // 0.5%
    uint256 private constant GOVERNANCE_SUPER_MAJORITY = 66e16; // 66%
    uint256 private constant GOVERNANCE_EMERGENCY_DELAY = 6; // 6 epochs

    /* DAO */
    uint256 private constant ADVANCE_INCENTIVE = 1e20; // 100 ESD    
    uint256 private constant DAO_EXIT_LOCKUP_EPOCHS = 1; // 1 epochs fluid

    /* Pool */
    // QSD #9
    uint256 private constant POOL_EXIT_LOCKUP_EPOCHS = 1; // 1 epochs fluid

    /* Market */
    uint256 private constant DEBT_RATIO_CAP = 15e16; // 15%

    /* Regulator (post-bootstrap) */
    // QSD #2
    uint256 private constant SUPPLY_CHANGE_LIMIT = 54e15; // 5.4% Expansion/Contraction limit
    uint256 private constant POOL_BONDING_RATIO = 67; // 67%
    uint256 private constant POOL_LP_RATIO = 23; // 23%
    uint256 private constant TREASURY_RATIO = 5; // 5%
    uint256 private constant GOV_STAKING_RATIO = 5; // 5%

    /* External */
    address private constant TREASURY_ADDRESS = address(0x61c32f08B0cbe61feF4166f09363504b4b5F38d8);

    /**
     * Getters
     */

    function getDaiAddress() internal pure returns (address) {
        return DAI;
    }

    function getOracleReserveMinimum() internal pure returns (uint256) {
        return ORACLE_RESERVE_MINIMUM;
    }

    function getPreviousEpochStrategy() internal pure returns (EpochStrategy memory) {
        return EpochStrategy({
            offset: PREVIOUS_EPOCH_OFFSET,
            start: PREVIOUS_EPOCH_START,
            period: PREVIOUS_EPOCH_PERIOD
        });
    }

    function getCurrentEpochStrategy() internal pure returns (EpochStrategy memory) {
        return EpochStrategy({
            offset: CURRENT_EPOCH_OFFSET,
            start: CURRENT_EPOCH_START,
            period: CURRENT_EPOCH_PERIOD
        });
    }

    function getInitialStakeMultiple() internal pure returns (uint256) {
        return INITIAL_STAKE_MULTIPLE;
    }

    function getBootstrappingPeriod() internal pure returns (uint256) {
        return BOOTSTRAPPING_PERIOD;
    }

    function getBootstrappingPrice() internal pure returns (Decimal.D256 memory) {
        return Decimal.D256({value: BOOTSTRAPPING_PRICE});
    }

    function getGovernancePeriod() internal pure returns (uint256) {
        return GOVERNANCE_PERIOD;
    }

    function getGovernanceExpiration() internal pure returns (uint256) {
        return GOVERNANCE_EXPIRATION;
    }

    function getGovernanceQuorum() internal pure returns (Decimal.D256 memory) {
        return Decimal.D256({value: GOVERNANCE_QUORUM});
    }

    function getGovernanceProposalThreshold() internal pure returns (Decimal.D256 memory) {
        return Decimal.D256({value: GOVERNANCE_PROPOSAL_THRESHOLD});
    }

    function getGovernanceSuperMajority() internal pure returns (Decimal.D256 memory) {
        return Decimal.D256({value: GOVERNANCE_SUPER_MAJORITY});
    }

    function getGovernanceEmergencyDelay() internal pure returns (uint256) {
        return GOVERNANCE_EMERGENCY_DELAY;
    }

    function getAdvanceIncentive() internal pure returns (uint256) {
        return ADVANCE_INCENTIVE;
    }

    function getDAOExitLockupEpochs() internal pure returns (uint256) {
        return DAO_EXIT_LOCKUP_EPOCHS;
    }

    function getPoolExitLockupEpochs() internal pure returns (uint256) {
        return POOL_EXIT_LOCKUP_EPOCHS;
    }
    
    function getDebtRatioCap() internal pure returns (Decimal.D256 memory) {
        return Decimal.D256({value: DEBT_RATIO_CAP});
    }

    function getSupplyChangeLimit() internal pure returns (Decimal.D256 memory) {
        return Decimal.D256({value: SUPPLY_CHANGE_LIMIT});
    }

    function getPoolLPRatio() internal pure returns (uint256) {
        return POOL_LP_RATIO;
    }

    function getPoolBondingRatio() internal pure returns (uint256) {
        return POOL_BONDING_RATIO;
    }

    function getGovStakingRatio() internal pure returns (uint256) {
        return GOV_STAKING_RATIO;
    }

    function getTreasuryRatio() internal pure returns (uint256) {
        return TREASURY_RATIO;
    }

    function getChainId() internal pure returns (uint256) {
        return CHAIN_ID;
    }

    function getTreasuryAddress() internal pure returns (address) {
        return TREASURY_ADDRESS;
    }

    function getGovernanceTokenMaxSupply() internal pure returns (uint256) {
        return GOVERNANCE_MAX_SUPPLY;
    }

    function getGovernanceTokenPerBlock() internal pure returns (uint256) {
        return GOVERNANCE_DISTRIBUTED_PER_BLOCK;
    }
}
function getDaiAddress() internal pure returns (address) {
        return DAI;
    }
/**
 * Getters
 */