pragma solidity 0.6.12;

// This is adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.0.0/contracts/presets/ERC721PresetMinterPauserAutoId.sol

import "./utils/AccessControl.sol";
import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721Burnable.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721Pausable.sol";


contract ERC721MinterBurnerPauser is Context, AccessControl, ERC721Burnable, ERC721Pausable {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");

    /**
     * @dev Grants `DEFAULT_ADMIN_ROLE` and `MINTER_ROLE`to the account that
     * deploys the contract.
     *
     * Token URIs will be autogenerated based on `baseURI` and their token IDs.
     * See {ERC721-tokenURI}.
     */
    constructor(string memory name, string memory symbol, string memory baseURI) public ERC721(name, symbol) {
        _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());

        _setupRole(MINTER_ROLE, _msgSender());
        _setupRole(PAUSER_ROLE, _msgSender());

        _setBaseURI(baseURI);
    }

    /**
     * @dev Creates a new token for `to`. Its token ID will be automatically
     * assigned (and available on the emitted {Transfer} event), and the token
     * URI autogenerated based on the base URI passed at construction.
     *
     * See {ERC721-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the `MINTER_ROLE`.
     */
    function mint(address to, uint256 tokenId, string memory _data) public {
        require(hasRole(MINTER_ROLE, _msgSender()), "ERC721MinterBurnerPauser: must have minter role to mint");

        _mint(to, tokenId);
        _setTokenURI(tokenId, _data);
    }

    /**
     * @dev Pauses all token transfers.
     *
     * See {ERC721Pausable} and {Pausable-_pause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function pause() public {
        require(hasRole(PAUSER_ROLE, _msgSender()), "ERC721MinterBurnerPauser: must have pauser role to pause");
        _pause();
    }

    /**
     * @dev Unpauses all token transfers.
     *
     * See {ERC721Pausable} and {Pausable-_unpause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function unpause() public {
        require(hasRole(PAUSER_ROLE, _msgSender()), "ERC721MinterBurnerPauser: must have pauser role to unpause");
        _unpause();
    }

    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal override(ERC721, ERC721Pausable) {
        super._beforeTokenTransfer(from, to, tokenId);
    }
}