// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "../ResolverBase.sol";
import "./IAddrResolver.sol";
import "./IAddressResolver.sol";

abstract contract SmartBchAddrResolver is IAddrResolver, IAddressResolver, ResolverBase {
    uint constant private COIN_TYPE_SMARTBCH = 2147493648;

    mapping(bytes32=>mapping(uint=>bytes)) _addresses;

    /**
     * Sets the address associated with an ENS node.
     * May only be called by the owner of that node in the ENS registry.
     * @param node The node to update.
     * @param a The address to set.
     */
    function setAddr(bytes32 node, address a) virtual external authorised(node) {
        setAddr(node, COIN_TYPE_SMARTBCH, addressToBytes(a));
    }

    /**
     * Returns the address associated with an ENS node.
     * @param node The ENS node to query.
     * @return The associated address.
     */
    function addr(bytes32 node) virtual override public view returns (address payable) {
        bytes memory a = addr(node, COIN_TYPE_SMARTBCH);
        if(a.length == 0) {
            return payable(0);
        }
        return bytesToAddress(a);
    }

    function setAddr(bytes32 node, uint coinType, bytes memory a) virtual public authorised(node) {
        if(coinType == COIN_TYPE_SMARTBCH) {
            emit AddrChanged(node, bytesToAddress(a));
        }
        emit AddressChanged(node, coinType, a);
        _addresses[node][coinType] = a;
    }

    function addr(bytes32 node, uint coinType) virtual override public view returns(bytes memory) {
        return _addresses[node][coinType];
    }

    function supportsInterface(bytes4 interfaceID) virtual override public pure returns(bool) {
        return interfaceID == type(IAddrResolver).interfaceId || interfaceID == type(IAddressResolver).interfaceId || super.supportsInterface(interfaceID);
    }

    function bytesToAddress(bytes memory b) internal pure returns(address payable a) {
        require(b.length == 20);
        assembly {
            a := div(mload(add(b, 32)), exp(256, 12))
        }
    }

    function addressToBytes(address a) internal pure returns(bytes memory b) {
        b = new bytes(20);
        assembly {
            mstore(add(b, 32), mul(a, exp(256, 12)))
        }
    }
}