pragma ever-solidity >= 0.62.0;

pragma AbiHeader expire;
pragma AbiHeader time;
pragma AbiHeader pubkey;

import "./TIP4_1/TIP4_1Nft.tsol";
import "./TIP4_2/TIP4_2Nft.tsol";
import "./TIP4_3/TIP4_3Nft.tsol";

import './interfaces/IBurnableCollection.tsol';


contract NftFlagTransferable is TIP4_1Nft, TIP4_2Nft, TIP4_3Nft {

    bool _transferable;
    uint8 constant not_transferable = 108;

    constructor(
        address owner,
        address sendGasTo,
        uint128 remainOnNft,
        string json,
        uint128 indexDeployValue,
        uint128 indexDestroyValue,
        TvmCell codeIndex,
        bool transferable
    ) TIP4_1Nft(
        owner,
        sendGasTo,
        remainOnNft
    ) TIP4_2Nft (
        json
    ) TIP4_3Nft (
        indexDeployValue,
        indexDestroyValue,
        codeIndex
    ) public {
        tvm.accept();
        _transferable = transferable;
    }

    function isTransferable() external view responsible returns (bool) {
		return {value: 0, flag: 64, bounce: false} (_transferable);
	}

    function _beforeTransfer(
        address /*to*/,
        address sendGasTo, 
        mapping(address => CallbackParams) /*callbacks*/
    ) internal virtual override(TIP4_1Nft, TIP4_3Nft) {
        require(_transferable, not_transferable);
        TIP4_3Nft._destructIndex(sendGasTo);
    }

    function _afterTransfer(
        address /*to*/,
        address /*sendGasTo*/,
        mapping(address => CallbackParams) /*callbacks*/
    ) internal virtual override(TIP4_1Nft, TIP4_3Nft) {
        TIP4_3Nft._deployIndex();
    }

    function _beforeChangeOwner(
        address /*oldOwner*/,
        address /*newOwner*/,
        address sendGasTo, 
        mapping(address => CallbackParams) /*callbacks*/
    ) internal virtual override(TIP4_1Nft, TIP4_3Nft) {
        require(_transferable, not_transferable);
        TIP4_3Nft._destructIndex(sendGasTo);
    }   

    function _afterChangeOwner(
        address /*oldOwner*/,
        address /*newOwner*/,
        address /*sendGasTo*/,
        mapping(address => CallbackParams) /*callbacks*/
    ) internal virtual override(TIP4_1Nft, TIP4_3Nft) {
        TIP4_3Nft._deployIndex();
    }

    function _beforeChangeManager(
        address /*oldManager*/,
        address /*newManager*/,
        address /*sendGasTo*/,
        mapping(address => CallbackParams) /*callbacks*/
    ) internal virtual override {
        require(_transferable, not_transferable);
    }

    function _afterChangeManager(
        address oldManager,
        address newManager,
        address sendGasTo,
        mapping(address => CallbackParams) callbacks
    ) internal virtual override {
        oldManager; newManager; sendGasTo; callbacks;
    }

    function burn(
        address sendGasTo,
        address callbackTo,
        TvmCell callbackPayload
    ) external view virtual onlyManager {
        tvm.accept();
        IBurnableCollection(_collection).acceptNftBurn{
            value: 0,
            flag: 128 + 32,
            bounce: false
        }(
            _id,
            _owner,
            _manager,
            sendGasTo,
            callbackTo,
            callbackPayload
        );
    }
}