// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;

import "../TornadoTrees.sol";

contract TornadoTreesMock is TornadoTrees {
  uint256 public currentBlock;

  constructor(
    bytes32 _governance,
    bytes32 _tornadoProxy,
    bytes32 _treeUpdateVerifier,
    bytes32 _depositRoot,
    bytes32 _withdrawalRoot
  ) public TornadoTrees(_governance, _tornadoProxy, _treeUpdateVerifier, _depositRoot, _withdrawalRoot) {}

  function resolve(bytes32 _addr) public view override returns (address) {
    return address(uint160(uint256(_addr) >> (12 * 8)));
  }

  function setBlockNumber(uint256 _blockNumber) public {
    currentBlock = _blockNumber;
  }

  function blockNumber() public view override returns (uint256) {
    return currentBlock == 0 ? block.number : currentBlock;
  }

  function register(
    address _instance,
    bytes32 _commitment,
    bytes32 _nullifier,
    uint256 _depositBlockNumber,
    uint256 _withdrawBlockNumber
  ) public {
    setBlockNumber(_depositBlockNumber);
    deposits.push(keccak256(abi.encode(_instance, _commitment, blockNumber())));
    setBlockNumber(_withdrawBlockNumber);
    withdrawals.push(keccak256(abi.encode(_instance, _nullifier, blockNumber())));
  }

  function updateDepositTreeMock(
    bytes32 _oldRoot,
    bytes32 _newRoot,
    uint32 _pathIndices,
    TreeLeaf[] calldata _events
  ) public pure returns (uint256) {
    bytes memory data = new bytes(BYTES_SIZE);
    assembly {
      mstore(add(data, 0x44), _pathIndices)
      mstore(add(data, 0x40), _newRoot)
      mstore(add(data, 0x20), _oldRoot)
    }
    for (uint256 i = 0; i < CHUNK_SIZE; i++) {
      (bytes32 hash, address instance, uint32 depositBlock) = (_events[i].hash, _events[i].instance, _events[i].block);
      assembly {
        mstore(add(add(data, mul(ITEM_SIZE, i)), 0x7c), depositBlock)
        mstore(add(add(data, mul(ITEM_SIZE, i)), 0x78), instance)
        mstore(add(add(data, mul(ITEM_SIZE, i)), 0x64), hash)
      }
    }
    return uint256(sha256(data)) % SNARK_FIELD;
  }

  function updateDepositTreeMock2(
    bytes32 _oldRoot,
    bytes32 _newRoot,
    uint32 _pathIndices,
    TreeLeaf[] calldata _events
  ) public pure returns (bytes memory) {
    bytes memory data = new bytes(BYTES_SIZE);
    assembly {
      mstore(add(data, 0x44), _pathIndices)
      mstore(add(data, 0x40), _newRoot)
      mstore(add(data, 0x20), _oldRoot)
    }
    for (uint256 i = 0; i < CHUNK_SIZE; i++) {
      (bytes32 hash, address instance, uint32 depositBlock) = (_events[i].hash, _events[i].instance, _events[i].block);
      assembly {
        mstore(add(add(data, mul(ITEM_SIZE, i)), 0x7c), depositBlock)
        mstore(add(add(data, mul(ITEM_SIZE, i)), 0x78), instance)
        mstore(add(add(data, mul(ITEM_SIZE, i)), 0x64), hash)
      }
    }
    return data;
  }
}