// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.9;




/**
 * @notice This contract holds the NFTs of the Murmuration collection
 * @dev Sale is implemented in another contract. See {MurmurationSale}
 */
contract Murmuration is ERC721, ERC2981, Ownable, AccessControlEnumerable {
    //Admin role that will manage the minter role and the URI
    bytes32 public constant ADMIN_ROLE = keccak256("ADMIN_ROLE");
    //Minter role that will be allowed to mint
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

    //There are 11 pieces of work in the Murmuration collection
    uint256 public constant MAX_SUPPLY = 11;

    //URI that will point to the metadatas
    string public baseURI;

    //Prevent further changes to metadatas
    bool public metadatasFrozen = false;

    constructor(address _baseRoyaltyReceiver) ERC721("Murmuration", "MURMURATION") {
        _setRoleAdmin(MINTER_ROLE, ADMIN_ROLE); //Admin role can grant and revoke minter role
        _grantRole(ADMIN_ROLE, msg.sender); //Make deployer Admin by default
        _setDefaultRoyalty(_baseRoyaltyReceiver, 700);
    }

    modifier onlyAdmin() {
        require(
            hasRole(ADMIN_ROLE, msg.sender),
            "You are not allowed to perform this action"
        );
        _;
    }

    modifier onlyMinter() {
        require(
            hasRole(MINTER_ROLE, msg.sender),
            "You are not allowed to perform this action"
        );
        _;
    }

    /**
     * @dev Transfers the admin role. Only callable by current admin.
     */
    function transferAdmin(address _to) public onlyAdmin {
        require(_to != address(0), "Can't lose adminship");
        _revokeRole(ADMIN_ROLE, msg.sender);
        _grantRole(ADMIN_ROLE, _to);
    }

    /**
     * @dev Changes the base uri that will hold the metadatas.
     * @param _newBaseURI The new uri
     */
    function setBaseURI(string calldata _newBaseURI) public onlyAdmin {
        require(!metadatasFrozen, "Metadatas are frozen");
        baseURI = _newBaseURI;
    }

    /**
     * @dev Freezes the metadatas of the contract, preventing any modifications to the NFT.
     */
    function freezeMetadatas() public onlyAdmin {
        metadatasFrozen = true;
    }

    /**
     * @dev Mints a token.
     * @param _to The address to mint the NFT to
     * @param _id The id of the token to mint
     */
    function mintTo(address _to, uint256 _id) public onlyMinter {
        //Check that the id to be minted is in range [1;MAX_SUPPLY].
        require(_id >= 1 && _id <=MAX_SUPPLY, "This NFT does not exist");
        //If id has already by minted, this will revert
        _mint(_to, _id);
    }

    /**
     * @dev Change the royalties for this collection.
     * @param _receiver The address that will receive the royalties
     * @param _feeNumerator The number of basis points. Example: _feeNumerator = 100 -> 1% royalties
     */
    function setDefaultRoyalty(address _receiver, uint96 _feeNumerator) public onlyAdmin{

        _setDefaultRoyalty(_receiver, _feeNumerator);

    }

    /**
     * @dev Overrides the _baseURI from ERC721 to use this contract's baseURI
     */
    function _baseURI() internal view override(ERC721) returns (string memory) {
        return baseURI;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC721, AccessControlEnumerable, ERC2981)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }

    /**
     * @dev Return the total supply of Murmuration. Used for display purposes.
     */
    function totalSupply() public pure returns(uint256){
        return 11;
    }
}
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