pragma solidity ^0.5.8;

contract BaseMigration {

    function convertPurity(uint16 purity)
        public
        pure
        returns (uint8)
    {
        return uint8(4 - (purity / 1000));
    }

    function convertProto(uint16 proto)
        public
        view
        returns (uint16)
    {
        if (proto >= 1 && proto <= 377) {
            return proto;
        }
        // first phoenix
        if (proto == 380) {
            return 400;
        }
        // light's bidding
        if (proto == 381) {
            return 401;
        }
        // chimera
        if (proto == 394) {
            return 402;
        }
        // etherbots
        (bool found, uint index) = getEtherbotsIndex(proto);
        if (found) {
            return uint16(380 + index);
        }
        // hyperion
        if (proto == 378) {
            return 65000;
        }
        // prometheus
        if (proto == 379) {
            return 65001;
        }
        // atlas
        if (proto == 383) {
            return 65002;
        }
        // tethys
        if (proto == 384) {
            return 65003;
        }
        require(false, "BM: unrecognised proto");
    }

    uint16[] internal ebs = [
        400,
        413,
        414,
        421,
        427,
        428,
        389,
        415,
        416,
        422,
        424,
        425,
        426,
        382,
        420,
        417
    ];

    function getEtherbotsIndex(uint16 proto)
        public
        view
        returns (bool, uint16)
    {
        for (uint16 i = 0; i < ebs.length; i++) {
            if (ebs[i] == proto) {
                return (true, i);
            }
        }
        return (false, 0);
    }

}

contract IPackFour {

    struct Purchase {
        uint16 current;
        uint16 count;
        address user;
        uint randomness;
        uint64 commit;
    }

    function purchases(uint p) public view returns (
        uint16 current,
        uint16 count,
        address user,
        uint256 randomness,
        uint64 commit
    );

    function predictPacks(uint id) public view returns (uint16[] memory protos, uint16[] memory purities);

    function getCardDetails(
        uint16 packIndex,
        uint8 cardIndex,
        uint result
    )
        public
        view
        returns (uint16 proto, uint16 purity);
}

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}


/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        _owner = _msgSender();
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}


/**
 * @dev Required interface of an ERC721 compliant contract.
 */
contract IERC721 is IERC165 {
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of NFTs in `owner`'s account.
     */
    function balanceOf(address owner) public view returns (uint256 balance);

    /**
     * @dev Returns the owner of the NFT specified by `tokenId`.
     */
    function ownerOf(uint256 tokenId) public view returns (address owner);

    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     *
     *
     * Requirements:
     * - `from`, `to` cannot be zero.
     * - `tokenId` must be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this
     * NFT by either {approve} or {setApprovalForAll}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public;
    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     * Requirements:
     * - If the caller is not `from`, it must be approved to move this NFT by
     * either {approve} or {setApprovalForAll}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public;
    function approve(address to, uint256 tokenId) public;
    function getApproved(uint256 tokenId) public view returns (address operator);

    function setApprovalForAll(address operator, bool _approved) public;
    function isApprovedForAll(address owner, address operator) public view returns (bool);


    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public;
}


contract ICards is IERC721 {

    struct Batch {
        uint48 userID;
        uint16 size;
    }

    function batches(uint index) public view returns (uint48 userID, uint16 size);

    function userIDToAddress(uint48 id) public view returns (address);

    function getDetails(
        uint tokenId
    )
        public
        view
        returns (
        uint16 proto,
        uint8 quality
    );

    function setQuality(
        uint tokenId,
        uint8 quality
    ) public;

    function mintCards(
        address to,
        uint16[] memory _protos,
        uint8[] memory _qualities
    )
        public
        returns (uint);

    function mintCard(
        address to,
        uint16 _proto,
        uint8 _quality
    )
        public
        returns (uint);

    function burn(uint tokenId) public;

    function batchSize()
        public
        view
        returns (uint);
}




contract OverrideMigration is BaseMigration, Ownable {

    event Migrated(address indexed pack, uint indexed id, uint indexed startID);

    mapping (address => mapping (uint => bool)) public migrated;

    bool public locked;

    ICards public cards;

    constructor(
        ICards _cards
    ) public {
        cards = _cards;
    }

    function migrate(IPackFour pack, uint id, address user) external onlyOwner {

        require(!locked, "can't be locked");
        require(!migrated[address(pack)][id], "can't double migrate");
        migrated[address(pack)][id] = true;

        uint16[] memory protos;
        uint16[] memory purities;

        (protos, purities) = pack.predictPacks(id);

        uint8[] memory qualities = new uint8[](protos.length);

        for (uint j = 0; j < protos.length; j++) {
            protos[j] = convertProto(protos[j]);
            qualities[j] = convertPurity(purities[j]);
        }

        uint startID = cards.mintCards(user, protos, qualities);

        emit Migrated(address(pack), id, startID);

    }

    function lock() external onlyOwner {
        require(!locked, "already locked");
        locked = true;
    }


}