// SPDX-License-Identifier: MIT
// Copyright 2023 PROOF Holdings Inc
pragma solidity ^0.8.15;

import {IEntropyOracle} from "proof/entropy/IEntropyOracle.sol";

import {MythicsEggErrors} from "./MythicsEggErrors.sol";
import {
    StochasticSampler, StochasticSamplerWithCDFStorage, StochasticSamplerWithOracle
} from "./StochasticSampling.sol";

/**
 * @title Mythics: Egg type sampling module
 * @author David Huber (@cxkoda)
 * @custom:reviewer Arran Schlosberg (@divergencearran)
 */
abstract contract MythicEggSampler is StochasticSamplerWithCDFStorage, StochasticSamplerWithOracle, MythicsEggErrors {
    /**
     * @notice The different types of eggs.
     */
    enum EggType {
        Stone,
        Runic,
        Legendary
    }

    /**
     * @notice Number of egg types
     */
    uint8 public constant NUM_EGG_TYPES = 3;

    /**
     * @notice Trait ID for the egg type
     */
    uint8 private constant _EGG_TYPE_TRAIT_ID = 0;

    /**
     * @notice Token-specific parameters for sampling the egg type
     * @dev Will be determined at mint.
     * @param revealBlockNumber Number of the block whose entropy will be used to reaveal the egg type.
     * @param distributionVersion The version/index of probability distribution to sample the egg type.
     * @param mixHash Part of the block mixHash to blind the entropy oracle.
     */
    struct SamplingParams {
        uint64 revealBlockNumber;
        uint16 distributionVersion;
        uint128 mixHash;
    }

    /**
     * @notice Egg-type sampling parameters keyed by token ID.
     */
    mapping(uint256 => SamplingParams) private _samplingParams;

    /**
     * @dev Constructor helper function.
     */
    function _numPerTrait() private pure returns (uint256[] memory) {
        uint256[] memory numPerTrait = new uint256[](1);
        numPerTrait[_EGG_TYPE_TRAIT_ID] = NUM_EGG_TYPES;
        return numPerTrait;
    }

    constructor(IEntropyOracle oracle)
        StochasticSamplerWithCDFStorage(_numPerTrait())
        StochasticSamplerWithOracle(oracle)
    {}

    /**
     * @notice Returns the egg-type sampling parameters for a given token ID.
     */
    function samplingParams(uint256 tokenId) public view returns (SamplingParams memory) {
        if (!_exists(tokenId)) {
            revert NonexistentEgg(tokenId);
        }

        return _samplingParams[tokenId];
    }

    /**
     * @inheritdoc StochasticSamplerWithCDFStorage
     * @dev Reads the token-specific parameters.
     */
    function _distributionVersion(uint256 tokenId, uint256 traitId) internal view virtual override returns (uint256) {
        assert(traitId == _EGG_TYPE_TRAIT_ID);
        return _samplingParams[tokenId].distributionVersion;
    }

    /**
     * @inheritdoc StochasticSamplerWithOracle
     * @dev Reads the token-specific parameters.
     */
    function _revealBlockNumber(uint256 tokenId) internal view virtual override returns (uint256) {
        return _samplingParams[tokenId].revealBlockNumber;
    }

    /**
     * @notice Registers a token for egg-type sampling using the currently set probability distribution.
     * @dev Must be called upon token mint.
     */
    function _registerForSampling(uint256 tokenId) internal {
        uint256 revealBlockNumber = block.number;

        _samplingParams[tokenId] = SamplingParams({
            revealBlockNumber: uint64(revealBlockNumber),
            distributionVersion: uint16(_latestDistributionVersion(_EGG_TYPE_TRAIT_ID)),
            // Smearing out single-bit-of-influence from the prevrandao since we're just using 128 bits (mainly to
            // prevent the forge fuzzer from finding breaking runs which would force us to add circular testing logic).
            mixHash: uint128(uint256(keccak256(abi.encode(block.prevrandao))))
        });
        entropyOracle.requestEntropy(revealBlockNumber);
    }

    /**
     * @notice Sets the probability distribution for egg types.
     */
    function _setEggProbabilities(uint64[NUM_EGG_TYPES] memory pdf) internal {
        uint64[] memory p = new uint64[](NUM_EGG_TYPES);
        for (uint256 i = 0; i < NUM_EGG_TYPES; i++) {
            p[i] = pdf[i];
        }
        _pushProbabilities(_EGG_TYPE_TRAIT_ID, p);
    }

    /**
     * @inheritdoc StochasticSamplerWithOracle
     * @dev Mixes the seed with the token-specific parameters to blind the EntropyOracle.
     */
    function _seed(uint256 tokenId)
        internal
        view
        virtual
        override(StochasticSampler, StochasticSamplerWithOracle)
        returns (bytes32, bool)
    {
        (bytes32 seed, bool revealed) = StochasticSamplerWithOracle._seed(tokenId);
        return (keccak256(abi.encode(seed, samplingParams(tokenId))), revealed);
    }

    /**
     * @notice Returns the egg type of a given token ID and a boolean flag to indicate whether it was already revealed.
     */
    function eggType(uint256 tokenId) public view returns (EggType, bool) {
        (uint256 sample, bool revealed) = _sampleTrait(tokenId, _EGG_TYPE_TRAIT_ID);
        return (EggType(sample), revealed);
    }

    /**
     * @notice Returns whether a token exists.
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool);
}

// SPDX-License-Identifier: MIT
// Copyright 2023 PROOF Holdings Inc
pragma solidity ^0.8.15;

interface MythicsEggErrors {
    /**
     * @notice Thrown if one attempts an action on a nonexistent egg.
     */
    error NonexistentEgg(uint256 tokenId);
}

// SPDX-License-Identifier: MIT
// Copyright 2023 PROOF Holdings Inc
pragma solidity ^0.8.15;

/**
 * @notice Module to rate limit a certain action per discrete block of time.
 * @author David Huber (@cxkoda)
 * @custom:reviewer Arran Schlosberg (@divergencearran)
 */
contract NonRollingRateLimited {
    /**
     * @notice Thrown if on attempts to exceed the rate limit.
     */
    error ExceedingRateLimit(uint256 requested, uint256 numLeft);

    /**
     * @notice The duration of a period in seconds.
     */
    uint64 private immutable _periodLength;

    /**
     * @notice The index of the last period for which an action has been performed.
     */
    uint64 private _lastPeriod;

    /**
     * @notice The maximum number of actions that can be performed in a period.
     */
    uint64 private __maxActionsPerPeriod;

    /**
     * @notice The number of actions that have been performed in the current period.
     * @dev Will automatically be reset to 0 in `rateLimited` at the start of each period.
     */
    uint64 private __performedCurrentPeriod;

    constructor(uint64 maxActionsPerPeriod, uint64 periodLength) {
        _periodLength = periodLength;
        _setMaxActionsPerPeriod(maxActionsPerPeriod);
    }

    /**
     * @notice Helper function to get the index of the current period.
     */
    function _currentPeriod() private view returns (uint64) {
        return uint64(block.timestamp / _periodLength);
    }

    /**
     * @notice Sets the maximum number of actions per period.
     */
    function _setMaxActionsPerPeriod(uint64 maxActionsPerPeriod) internal {
        __maxActionsPerPeriod = maxActionsPerPeriod;
    }

    /**
     * @notice Returns the maximum number of actions per period.
     */
    function _maxActionsPerPeriod() internal view returns (uint64) {
        return __maxActionsPerPeriod;
    }

    /**
     * @notice Keeps track of the number of performed actions.
     * @dev Reverts if the maximum number of actions per period is exceeded.
     */
    function _checkAndTrackRateLimit(uint64 requested) internal {
        uint64 performed = _performedCurrentPeriod();
        uint64 left = __maxActionsPerPeriod - performed;
        if (requested > left) {
            revert ExceedingRateLimit(requested, left);
        }
        __performedCurrentPeriod = performed + requested;
        _lastPeriod = _currentPeriod();
    }

    /**
     * @notice The number of actions performed in the current period.
     */
    function _performedCurrentPeriod() internal view returns (uint64) {
        if (_currentPeriod() > _lastPeriod) {
            return 0;
        }
        return __performedCurrentPeriod;
    }
}

// SPDX-License-Identifier: MIT
// Copyright 2023 PROOF Holdings Inc
pragma solidity ^0.8.15;

import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {SettableCallbackerWithAccessControl} from "proof/sellers/presets/CallbackerWithAccessControl.sol";
import {Seller} from "proof/sellers/base/Seller.sol";

import {MythicEggSampler} from "../Egg/MythicEggSampler.sol";
import {NonRollingRateLimited} from "./NonRollingRateLimited.sol";

interface OddsoleumEvents {
    event OdditySacrificed(address indexed owner, uint256 tokenId);

    /**
     * @notice Emitted if a burner attempts to sacrifice an Oddity that is not in the queue or was not approved to be
     * transferred by the Oddsoleum contract.
     * @dev This will likely only happen in the case of a race condition, where Oddity nomination is revoked after
     * selecting it to be burned.
     */
    event CannotBurnIneligibleOddity(uint256 indexed tokenId, bool queued, bool approved);
}

/**
 * @title Oddsoleum
 * @notice Allows Oddities to enter a queue for being sacrificed on the altar of the Oddgod.
 * @author David Huber (@cxkoda)
 * @custom:reviewer Arran Schlosberg (@divergencearran)
 */
contract Oddsoleum is Seller, SettableCallbackerWithAccessControl, OddsoleumEvents, NonRollingRateLimited {
    /**
     * @notice The role allowed to burn oddities.
     */
    bytes32 public constant BURNER_ROLE = keccak256("BURNER_ROLE");

    /**
     * @notice The receiver of burned Oddities.
     * @dev The original Oddities contract does not allow burning, so we send the tokens to the dead address instead.
     */
    address public constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;

    /**
     * @notice The Oddities contract.
     */
    IERC721 public immutable oddities;

    /**
     * @notice Keeps track of Oddities that are in the queue to be sacrificed.
     * @dev Keyed by owner to automatically unqueue Oddities if they are transferred. Consequently, tokens will still
     * be queued after a round-trip, which can't be avoided as it would require a callback from the Oddities contract
     * upon transfer.
     */
    mapping(address owner => mapping(uint256 tokenId => bool)) private _queued;

    constructor(address admin, address steerer, IERC721 oddities_)
        SettableCallbackerWithAccessControl(admin, steerer)
        NonRollingRateLimited(50, 1 days)
    {
        _setRoleAdmin(BURNER_ROLE, DEFAULT_STEERING_ROLE);
        oddities = oddities_;
    }

    /**
     * @notice Adds the given Oddities to the senders queue.
     * @dev Oddity ownership is not relevant here as senders only have access to their own flag set. Upon burn, the
     * contract will only consider the flag of the current owner of the given Oddity.
     */
    function addToQueue(uint256[] calldata tokenIds) external {
        for (uint256 i = 0; i < tokenIds.length; ++i) {
            _queued[msg.sender][tokenIds[i]] = true;
        }
    }

    /**
     * @notice Removes the given Oddities from the senders queue.
     * @dev Oddity ownership is not relevant here as senders only have access to their own flag set. Upon burn, the
     * contract will only consider the flag of the current owner of the given Oddity.
     */
    function removeFromQueue(uint256[] calldata tokenIds) external {
        for (uint256 i = 0; i < tokenIds.length; ++i) {
            _queued[msg.sender][tokenIds[i]] = false;
        }
    }

    /**
     * @notice Returns whether the given Oddities are in the queue.
     * @dev This does not imply that they can be sacrificed, as the owner may not have approved this contract to burn
     * them.
     */
    function queued(uint256[] calldata tokenIds) public view returns (bool[] memory) {
        bool[] memory queued_ = new bool[](tokenIds.length);
        for (uint256 i = 0; i < tokenIds.length; ++i) {
            address owner = oddities.ownerOf(tokenIds[i]);
            queued_[i] = _queued[owner][tokenIds[i]];
        }
        return queued_;
    }

    /**
     * @notice Returns whether the given Oddities can be sacrificed.
     * @dev True iff the Oddity is in the queue and the owner has approved this contract to burn it.
     */
    function burnable(uint256[] calldata tokenIds) external view returns (bool[] memory) {
        bool[] memory burnable_ = new bool[](tokenIds.length);
        for (uint256 i = 0; i < tokenIds.length; ++i) {
            address owner = oddities.ownerOf(tokenIds[i]);
            burnable_[i] = _burnable(owner, tokenIds[i]);
        }
        return burnable_;
    }

    /**
     * @notice Returns whether the given Oddities can be sacrificed.
     */
    function _burnable(address owner, uint256 tokenId) internal view returns (bool) {
        return _queued[owner][tokenId] && _approved(owner, tokenId);
    }

    /**
     * @notice Returns whether the given Oddities can be sacrificed.
     */
    function _approved(address owner, uint256 tokenId) internal view returns (bool) {
        return (oddities.isApprovedForAll(owner, address(this)) || oddities.getApproved(tokenId) == address(this));
    }

    /**
     * @notice Burns the given Oddity by sending it to a burn address.
     */
    function _burn(address owner, uint256 tokenId) internal returns (bool) {
        bool queued_ = _queued[owner][tokenId];
        bool approved = _approved(owner, tokenId);

        if (!(queued_ && approved)) {
            emit CannotBurnIneligibleOddity(tokenId, queued_, approved);
            return false;
        }

        oddities.transferFrom(owner, BURN_ADDRESS, tokenId);
        emit OdditySacrificed(owner, tokenId);
        return true;
    }

    /**
     * @notice Sacrifices the given Oddity by burning it and awards a Mythic to the original owner in return.
     */
    function _sacrifice(uint256 tokenId) internal returns (bool) {
        address owner = oddities.ownerOf(tokenId);
        bool burned = _burn(owner, tokenId);
        if (!burned) {
            return false;
        }
        _purchase(owner, 1, /* total cost */ 0, "");
        return true;
    }

    /**
     * @notice Sacrifices the given Oddities by burning them and awards Mythics to the original owners in return.
     */
    function sacrifice(uint256[] calldata tokenIds) external onlyRole(BURNER_ROLE) {
        uint64 numSacrificed;
        for (uint256 i = 0; i < tokenIds.length; ++i) {
            bool sacrificed = _sacrifice(tokenIds[i]);

            unchecked {
                if (sacrificed) {
                    ++numSacrificed;
                }
            }
        }
        _checkAndTrackRateLimit(numSacrificed);
    }

    /**
     * @notice Sets the maximum number of activations per day.
     */
    function setMaxSacrificesPerPeriod(uint32 maxSacrificesPerPeriod) external onlyRole(DEFAULT_STEERING_ROLE) {
        _setMaxActionsPerPeriod(maxSacrificesPerPeriod);
    }
}

// SPDX-License-Identifier: MIT
// Copyright 2023 PROOF Holdings Inc
pragma solidity ^0.8.15;

import {IEntropyOracle} from "proof/entropy/IEntropyOracle.sol";

/**
 * @notice Helper libray for sampling from a discrete probability distribution.
 */
library StochasticSamplingLib {
    /**
     * @notice Computes the cumulative probability distribution from a discrete probability distribution.
     */
    function computeCDF(uint64[] memory pdf) internal pure returns (uint64[] memory) {
        uint64[] memory cdf = new uint64[](pdf.length);
        cdf[0] = pdf[0];
        for (uint256 i = 1; i < pdf.length; ++i) {
            cdf[i] = cdf[i - 1] + pdf[i];
        }

        return cdf;
    }

    /**
     * @notice Samples from a discrete cumulative probability distribution.
     * @dev This function assumes that rand is uniform in [0,2^256) and that `cdf[cdf.length - 1] << 2^256`. If not the
     * outcome will be biased
     */
    function sampleWithCDF(uint256 rand, uint64[] memory cdf) internal pure returns (uint256) {
        rand = rand % cdf[cdf.length - 1];

        for (uint256 i; i < cdf.length; ++i) {
            if (rand < cdf[i]) {
                return i;
            }
        }

        // This will never be reached given the above bounds of rand.
        assert(false);
        return 0;
    }
}

/**
 * @notice A contract that can sample token traits from discrete probability distributions.
 * @dev The probability distributions and seed derivation functions are implemented in the inheriting contracts.
 * @dev The functions defined here might be gas-heavy and are therefore intended to be used in view-calls only.
 */
abstract contract StochasticSampler {
    /**
     * @notice Returns a random seed for a given token and a boolean indicating whether the seed is available.
     */
    function _seed(uint256 tokenId) internal view virtual returns (bytes32, bool);

    /**
     * @notice Returns the cumulative probability distribution for a given trait of a given token.
     */
    function _cdf(uint256 tokenId, uint256 traitId) internal view virtual returns (uint64[] memory);

    /**
     * @notice Samples a trait for a given token.
     * @dev Returns the sampled trait and a boolean indicating whether the trait was already revealed (i.e. if the seed
     * for the given token is available).
     */
    function _sampleTrait(uint256 tokenId, uint256 traitId) internal view returns (uint256, bool) {
        (bytes32 seed, bool revealed) = _seed(tokenId);
        seed = keccak256(abi.encodePacked(seed, traitId));
        return (StochasticSamplingLib.sampleWithCDF(uint256(seed), _cdf(tokenId, traitId)), revealed);
    }
}

/**
 * @notice A contract that can sample token traits from discrete probability distributions loaded from storage.
 */
abstract contract StochasticSamplerWithCDFStorage is StochasticSampler {
    using StochasticSamplingLib for uint64[];

    /**
     * @notice Thrown if the traitId is invalid, i.e. if it exceeds the number of traits.
     */
    error InvalidTraitId(uint256 traitId);

    /**
     * @notice Thrown if the length of the given PDF does not match the number of realisations in a given trait.
     */
    error IncorrectPDFLength(uint256 gotLength, uint256 traitId, uint256 wantLength);

    /**
     * @notice Thrown if the given PDF cannot be normalised, i.e. if the sum of the probabilities is zero.
     */
    error ConstantZeroPDF();

    /**
     * @notice The number of realisations for each trait.
     */
    uint256[] private _numPerTrait;

    /**
     * @notice The cumulative probability distributions for each trait.
     * @dev Indexed by traitId, distributionVersion, sample.
     * @dev The distributionVersion is intended to allow having multiple "versions" of the probability distributions.
     */
    uint64[][][] private _cdfs;

    constructor(uint256[] memory numPerTrait) {
        _numPerTrait = numPerTrait;
        for (uint256 i; i < numPerTrait.length; ++i) {
            _cdfs.push(new uint64[][](0));
        }
        assert(_cdfs.length == numPerTrait.length);
    }

    /**
     * @notice Adds a new probability distribution for a given trait.
     */
    function _pushProbabilities(uint256 traitId, uint64[] memory pdf) internal {
        if (traitId >= _numPerTrait.length) {
            revert InvalidTraitId(traitId);
        }

        if (pdf.length != _numPerTrait[traitId]) {
            revert IncorrectPDFLength(pdf.length, traitId, _numPerTrait[traitId]);
        }

        uint64[] memory cdf = pdf.computeCDF();
        if (cdf[cdf.length - 1] == 0) {
            revert ConstantZeroPDF();
        }
        _cdfs[traitId].push(cdf);
    }

    /**
     * @notice Returns the version/index of the latest probability distribution for a given trait.
     */
    function _latestDistributionVersion(uint256 traitId) internal view returns (uint256) {
        return _cdfs[traitId].length - 1;
    }

    /**
     * @notice Returns the version/index of the probability distribution that is used for a given token and trait.
     * @dev This function is intended to be overridden by inheriting contracts.
     */
    function _distributionVersion(uint256 tokenId, uint256 traitId) internal view virtual returns (uint256);

    /**
     * @inheritdoc StochasticSampler
     * @dev Returns the probability distribution that is index by `_distributionVersion`.
     */
    function _cdf(uint256 tokenId, uint256 traitId) internal view virtual override returns (uint64[] memory) {
        if (traitId >= _numPerTrait.length) {
            revert InvalidTraitId(traitId);
        }
        return _cdfs[traitId][_distributionVersion(tokenId, traitId)];
    }
}

/**
 * @notice A contract that can sample token traits from discrete probability distributions using entropy provided by the
 * EntropyOracle.
 */
abstract contract StochasticSamplerWithOracle is StochasticSampler {
    /**
     * @notice The entropy oracle.
     */
    IEntropyOracle public entropyOracle;

    constructor(IEntropyOracle entropyOracle_) {
        entropyOracle = entropyOracle_;
    }

    /**
     * @inheritdoc StochasticSampler
     * @dev Uses the entropy of the block at `_revealBlockNumber(tokenId)`.
     */
    function _seed(uint256 tokenId) internal view virtual override returns (bytes32, bool) {
        bytes32 entropy = entropyOracle.blockEntropy(_revealBlockNumber(tokenId));
        return (keccak256(abi.encode(entropy, tokenId)), entropy != 0);
    }

    /**
     * @notice The blocknumber at which a given token will be revealed.
     * @dev The entropy provided by `entropyOracle` for this block will be used as seed for trait sampling.
     */
    function _revealBlockNumber(uint256 tokenId) internal view virtual returns (uint256);
}

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  "compilationTarget": {
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  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
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    "bytecodeHash": "none"
  },
  "optimizer": {
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    "runs": 9999
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    ":proof/entropy/=/home/dave/proof/proof-seller/contracts/entropy/",
    ":proof/redemption/=/home/dave/proof/proof-seller/contracts/redemption/src/",
    ":proof/sellers/=/home/dave/proof/proof-seller/contracts/sellers/src/"
  ]
}