// Contract: Hazel
// Target function: function _callonERC1155BatchReceived(address _from, address _to, uint256[] memory _ids, uint256[] memory _amounts, uint256 _gasLimit, bytes memory _data) internal
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        string memory docURI =  string.concat('<html><body><video autoplay controls src="data:video/mp4;base64,', videoURI, ' >',
                                    '</video></body></html>');
        bytes memory imageSvg = abi.encodePacked('"animation_url": "data:text/html;base64,', Base64.encode(bytes(docURI)),'",');
        return
            string(
                abi.encodePacked(
                    "data:application/json;base64,",
                    Base64.encode(
                        bytes(
                            abi.encodePacked(
                                '{"name":"Hazel","description":"0xHuskys dog. 100% onchain video",',
                                imageSvg,
                                '"attributes": []}'                                
                            )
                        )
                    )
                )
            );
    }

   

    /***********************************|
    |     Public Transfer Functions     |
    |__________________________________*/

    function safeTransferFrom(address _from, address _to, uint256 _id, uint256 _amount, bytes memory _data)
        public override
    {
        require((msg.sender == _from) || isApprovedForAll(_from, msg.sender), "ERC1155#safeTransferFrom: INVALID_OPERATOR");
        require(_to != address(0),"ERC1155#safeTransferFrom: INVALID_RECIPIENT");

        _safeTransferFrom(_from, _to, _id, _amount);
        _callonERC1155Received(_from, _to, _id, _amount, gasleft(), _data);
    }

    function safeBatchTransferFrom(address _from, address _to, uint256[] memory _ids, uint256[] memory _amounts, bytes memory _data)
        public override
    {
        // Requirements
        require((msg.sender == _from) || isApprovedForAll(_from, msg.sender), "ERC1155#safeBatchTransferFrom: INVALID_OPERATOR");
        require(_to != address(0), "ERC1155#safeBatchTransferFrom: INVALID_RECIPIENT");

        _safeBatchTransferFrom(_from, _to, _ids, _amounts);
        _callonERC1155BatchReceived(_from, _to, _ids, _amounts, gasleft(), _data);
    }


    /***********************************|
    |    Internal Transfer Functions    |
    |__________________________________*/

    function _safeTransferFrom(address _from, address _to, uint256 _id, uint256 _amount)
        internal
    {
        // Update balances
        balances[_from][_id] -= _amount;
        balances[_to][_id] += _amount;

        // Emit event
        emit TransferSingle(msg.sender, _from, _to, _id, _amount);
    }

    /**
    * @notice Verifies if receiver is contract and if so, calls (_to).onERC1155Received(...)
    */
    function _callonERC1155Received(address _from, address _to, uint256 _id, uint256 _amount, uint256 _gasLimit, bytes memory _data) internal {
        // Check if recipient is contract
        if (_to.code.length != 0) {
        bytes4 retval = IERC1155TokenReceiver(_to).onERC1155Received{gas: _gasLimit}(msg.sender, _from, _id, _amount, _data);
        require(retval == ERC1155_RECEIVED_VALUE, "ERC1155#_callonERC1155Received: INVALID_ON_RECEIVE_MESSAGE");
        }
    }

    function _safeBatchTransferFrom(address _from, address _to, uint256[] memory _ids, uint256[] memory _amounts) internal {
        require(_ids.length == _amounts.length, "ERC1155#_safeBatchTransferFrom: INVALID_ARRAYS_LENGTH");

        // Number of transfer to execute
        uint256 nTransfer = _ids.length;

        // Executing all transfers
        for (uint256 i = 0; i < nTransfer; i++) {
            
            balances[_from][_ids[i]] -= _amounts[i];
            balances[_to][_ids[i]]   += _amounts[i];
        }

        // Emit event
        emit TransferBatch(msg.sender, _from, _to, _ids, _amounts);
    }