// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// Interfaces
interface IERC165 {
  function supportsInterface(bytes4 _interfaceId) external view returns (bool);
}

interface IERC721 {
  function balanceOf(address _owner) external view returns (uint256 balance);
  function ownerOf(uint256 _tokenId) external view returns (address owner);
  function safeTransferFrom(address _from, address _to, uint256 _tokenId) external payable;
  function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes calldata _data) external payable;
  function transferFrom(address _from, address _to, uint256 _tokenId) external payable;
  function approve(address _to, uint256 _tokenId) external payable;
  function setApprovalForAll(address _operator, bool _approved) external;
  function getApproved(uint256 _tokenId) external view returns (address operator);
  function isApprovedForAll(address _owner, address _operator) external view returns (bool);
}

interface IERC721Metadata {
  function name() external view returns (string memory);
  function symbol() external view returns (string memory);
  function tokenURI(uint256 _tokenId) external view returns (string memory);
}

interface IERC721Receiver {
  function onERC721Received(address _operator, address _from, uint256 _tokenId, bytes calldata _data) external returns (bytes4);
}

library LibPart {
  bytes32 public constant TYPE_HASH = keccak256("Part(address account,uint96 value)");
  struct Part {
    address payable account;
    uint256 value;
  }
  function hash(Part memory part) internal pure returns (bytes32) {
    return keccak256(abi.encode(TYPE_HASH, part.account, part.value));
  }
}

// Abstract Contracts
abstract contract Ownable {
  address public owner;

  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

  constructor() {
    owner = msg.sender;
  }

  modifier onlyOwner() {
    require(owner == msg.sender, "Ownable: caller is not the owner");
    _;
  }

  function transferOwnership(address _newOwner) public virtual onlyOwner {
    require(_newOwner != address(0), "Ownable: new owner is the zero address");
    owner = _newOwner;
  }
}

abstract contract Mintable {
  mapping (address => bool) public minters;

  constructor() {
    minters[msg.sender] = true;
  }

  modifier onlyMinter() {
    require(minters[msg.sender], "Mintable: caller is not the minter");
    _;
  }

  function setMinter(address _minter) public virtual onlyMinter {
    require(_minter != address(0), "Mintable: new minter is the zero address");
    minters[_minter] = true;
  }

  function removeMinter(address _minter) external onlyMinter returns (bool) {
    require(minters[_minter], "Mintable: _minter is not a minter");
    minters[_minter] = false;
    return true;
  }
}

abstract contract Transferable is Ownable {
  mapping (address => bool) public whitelist;

  constructor() {}

  modifier canTransfer(address _to) {
    require(!isContractLocal(msg.sender) || whitelist[msg.sender], "Transferable: sender is not whitelisted contract");
    require(!isContractLocal(_to) || whitelist[_to], "Transferable: receiver is not whitelisted contract");
    _;
  }

  function setWhitelist(address _contract) public virtual onlyOwner {
    whitelist[_contract] = true;
  }

  function removeWhitelist(address _contract) external onlyOwner returns (bool) {
    require(whitelist[_contract], "Transferable: _contract is not whitelisted");
    whitelist[_contract] = false;
    return true;
  }

  // Utils
  function isContractLocal(address account) private view returns (bool) {
    uint256 size;
    assembly {
      size := extcodesize(account)
    }
    return size > 0;
  }
}

// Contract
contract OuchiAgDAO is Mintable, Transferable {
  // ERC721
  mapping(uint256 => address) private _owners;
  mapping(address => uint256) private _balances;
  mapping(uint256 => address) private _tokenApprovals;
  mapping(address => mapping(address => bool)) private _operatorApprovals;

  event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId);
  event Approval(address indexed _owner, address indexed _approved, uint256 indexed _tokenId);
  event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);
  event RoyaltiesSet(uint256 tokenId, LibPart.Part[] royalities);

  // Constants
  bytes4 private constant _INTERFACE_ID_ROYALTIES = 0xcad96cca; // Rarible
  bytes4 private constant _INTERFACE_ID_ERC2981 = 0x2a55205a; // ERC2981

  // ERC721Metadata
  string public name = 'OuchiAgDAO';
  string public symbol = 'OAG';
  string public baseUrl;

  // ERC721Enumerable
  mapping(address => mapping(uint256 => uint256)) private _ownedTokens;
  mapping(uint256 => uint256) private _ownedTokensIndex;
  uint256[] private _allTokens;
  mapping(uint256 => uint256) private _allTokensIndex;

  // Rarible
  mapping (uint256 => LibPart.Part[]) internal royalties;
  LibPart.Part internal globalRoyalty;
    
  // Constructor
  constructor() {}

  // ERC165
  function supportsInterface(bytes4 interfaceId) public pure returns (bool) {
    return
      interfaceId == type(IERC165).interfaceId ||
      interfaceId == type(IERC721).interfaceId ||
      interfaceId == type(IERC721Metadata).interfaceId ||
      interfaceId == _INTERFACE_ID_ROYALTIES ||
      interfaceId == _INTERFACE_ID_ERC2981;
  }

  // Customized (public)
  function setBaseUrl(string memory _baseUrl) external onlyOwner returns (bool) {
    baseUrl = _baseUrl;
    return true;
  }

  function mint(address _to) external onlyMinter returns (bool) {
    _mint(_to);
    return true;
  }

  function bulkMint(address _to, uint256 _count) external onlyOwner returns (bool) {
    for(uint256 i = 1; i <= _count; i++) {
      _mint(_to);
    }
    return true;
  }

  // ERC721 (public)
  function balanceOf(address owner) public view returns (uint256) {
    require(owner != address(0), "ERC721: balance query for the zero address");
    return _balances[owner];
  }

  function ownerOf(uint256 tokenId) public view returns (address) {
    address tokenOwner = _owners[tokenId];
    require(tokenOwner != address(0), "ERC721: owner query for nonexistent token");
    return tokenOwner;
  }

  function approve(address to, uint256 tokenId) public returns (bool) {
    address owner = ownerOf(tokenId);
    require(to != owner, "ERC721: approval to current owner");

    require(
      msg.sender == owner || isApprovedForAll(owner, msg.sender),
      "ERC721: approve caller is not owner nor approved for all"
    );

    _approve(to, tokenId);
    return true;
  }

  function getApproved(uint256 tokenId) public view returns (address) {
    require(_exists(tokenId), "ERC721: approved query for nonexistent token");
    return _tokenApprovals[tokenId];
  }

  function setApprovalForAll(address operator, bool approved) public returns (bool) {
    require(operator != msg.sender, "ERC721: approve to caller");

    _operatorApprovals[msg.sender][operator] = approved;
    emit ApprovalForAll(msg.sender, operator, approved);
    return true;
  }

  function isApprovedForAll(address owner, address operator) public view returns (bool) {
    return _operatorApprovals[owner][operator];
  }

  function transferFrom(address from, address to, uint256 tokenId) public canTransfer(to) returns (bool) {
    require(_isApprovedOrOwner(msg.sender, tokenId), "ERC721: transfer caller is not owner nor approved");
    _transfer(from, to, tokenId);
    return true;
  }

  function safeTransferFrom(address from, address to, uint256 tokenId) public canTransfer(to) {
    safeTransferFrom(from, to, tokenId, "");
  }

  function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public canTransfer(to) returns (bool) {
    require(_isApprovedOrOwner(msg.sender, tokenId), "ERC721: transfer caller is not owner nor approved");
    _safeTransfer(from, to, tokenId, _data);
    return true;
  }

  // ERC721 (private)
  function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) private {
    _transfer(from, to, tokenId);
    require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
  }

  function _exists(uint256 tokenId) private view returns (bool) {
    return _owners[tokenId] != address(0);
  }

  function _isApprovedOrOwner(address spender, uint256 tokenId) private view returns (bool) {
    require(_exists(tokenId), "ERC721: operator query for nonexistent token");
    address owner = ownerOf(tokenId);
    return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
  }

  function _mint(address _to) private {
    
    uint256 tokenId = _allTokens.length + 1;

    require(tokenId > 0, "ERC721: tokenId should be non-zero");
    require(!_exists(tokenId), "ERC721: token already minted");
    require(_to != address(0), "ERC721: mint to the zero address");

    _beforeTokenTransfer(address(0), _to, tokenId);

    _balances[_to] += 1;
    _owners[tokenId] = _to;

    emit Transfer(address(0), _to, tokenId);
  }

  function _transfer(address from, address to, uint256 tokenId) private {
    require(ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
    require(to != address(0), "ERC721: transfer to the zero address");

    _beforeTokenTransfer(from, to, tokenId);

    // Clear approvals from the previous owner
    _approve(address(0), tokenId);

    _balances[from] -= 1;
    _balances[to] += 1;
    _owners[tokenId] = to;

    emit Transfer(from, to, tokenId);
  }

  function _approve(address to, uint256 tokenId) private {
    _tokenApprovals[tokenId] = to;
    emit Approval(ownerOf(tokenId), to, tokenId);
  }

  function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data) private returns (bool) {
    if (isContract(to)) {
      try IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data) returns (bytes4 retval) {
        return retval == IERC721Receiver(to).onERC721Received.selector;
      } catch (bytes memory reason) {
        if (reason.length == 0) {
          revert("ERC721: transfer to non ERC721Receiver implementer");
        } else {
          assembly {
            revert(add(32, reason), mload(reason))
          }
        }
      }
    } else {
      return true;
    }
  }

  // ERC721Metadata
  function tokenURI(uint256 _tokenId) public view returns (string memory) {
    require(_exists(_tokenId), "ERC721Metadata: URI query for nonexistent token");
    return string(abi.encodePacked(baseUrl, toString(_tokenId), ".json"));
  }

  // ERC721Enumerable (public)
  function totalSupply() public view returns (uint256) {
    return _allTokens.length;
  }

  function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256) {
    require(index < balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
    return _ownedTokens[owner][index];
  }

  function tokenByIndex(uint256 index) public view returns (uint256) {
    require(index < totalSupply(), "ERC721Enumerable: global index out of bounds");
    return _allTokens[index];
  }

  // ERC721Enumerable (private)
  function _beforeTokenTransfer(address from, address to, uint256 tokenId) private {
    if (from == address(0)) {
      _addTokenToAllTokensEnumeration(tokenId);
    } else if (from != to) {
      _removeTokenFromOwnerEnumeration(from, tokenId);
    }
    if (to == address(0)) {
      _removeTokenFromAllTokensEnumeration(tokenId);
    } else if (to != from) {
      _addTokenToOwnerEnumeration(to, tokenId);
    }
  }

  function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
    uint256 length = balanceOf(to);
    _ownedTokens[to][length] = tokenId;
    _ownedTokensIndex[tokenId] = length;
  }

  function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
    _allTokensIndex[tokenId] = _allTokens.length;
    _allTokens.push(tokenId);
  }

  function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
    uint256 lastTokenIndex = balanceOf(from) - 1;
    uint256 tokenIndex = _ownedTokensIndex[tokenId];

    if (tokenIndex != lastTokenIndex) {
       uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

      _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
      _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
    }

    delete _ownedTokensIndex[tokenId];
    delete _ownedTokens[from][lastTokenIndex];
  }

  function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
    uint256 lastTokenIndex = _allTokens.length - 1;
    uint256 tokenIndex = _allTokensIndex[tokenId];

    uint256 lastTokenId = _allTokens[lastTokenIndex];

    _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
    _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

    delete _allTokensIndex[tokenId];
    _allTokens.pop();
  }

  // ERC2981
  function royaltyInfo(uint256 id, uint256 _salePrice) external view returns (address receiver, uint256 royaltyAmount) {
    if(globalRoyalty.value == 0) {
      if (royalties[id].length == 0) {
        receiver = address(0);
        royaltyAmount = 0;
      } else {
        LibPart.Part[] memory _royalties = royalties[id];
        receiver = _royalties[0].account;
        uint basisPoint;
        for (uint i = 0; i < _royalties.length; i++) {
          basisPoint += _royalties[i].value;
        }
        royaltyAmount = basisPoint * _salePrice / 10000;
      }
    } else {
      receiver = globalRoyalty.account;
      royaltyAmount = globalRoyalty.value * _salePrice / 10000;
    }
  }

  // Rarible
  function _updateAccount(uint256 _id, address _from, address _to) internal {
    uint length = royalties[_id].length;
    for(uint i = 0; i < length; i++) {
      if (royalties[_id][i].account == _from) {
        royalties[_id][i].account = payable(address(uint160(_to)));
      }
    }
  }

  function getRaribleV2Royalties(uint256 id) external view returns (LibPart.Part[] memory) {
    if(globalRoyalty.value == 0) {
      return royalties[id];
    } else{
      LibPart.Part[] memory _royalties = new LibPart.Part[](1);
      _royalties[0] = globalRoyalty;
      return _royalties;
    }
  }

  function _onRoyaltiesSet(uint256 id, LibPart.Part[] memory _royalties) internal {
    emit RoyaltiesSet(id, _royalties);
  }

  function setRoyalty(uint256 _tokenId, address payable _royaltiesRecipientAddress, uint96 _percentageBasisPoints) public onlyOwner returns (bool) {
    require(_royaltiesRecipientAddress != address(0), "Recipient should be present");
    require(_percentageBasisPoints != 0, "Royalty value should be positive");
    require(_percentageBasisPoints < 10000, "Royalty total value should be < 10000");

    LibPart.Part[] memory _royalties = new LibPart.Part[](1);
    _royalties[0].account = _royaltiesRecipientAddress;
    _royalties[0].value = _percentageBasisPoints;

    if(royalties[_tokenId].length > 0) {
      royalties[_tokenId][0].account = _royaltiesRecipientAddress;
      royalties[_tokenId][0].value = _percentageBasisPoints;
    } else {
      royalties[_tokenId].push(_royalties[0]);
    }
    _onRoyaltiesSet(_tokenId, _royalties);
    return true;
  }

  function setGlobalRoyalty(address payable _royaltiesRecipientAddress, uint96 _percentageBasisPoints) public onlyOwner returns (bool) {
    globalRoyalty = LibPart.Part(_royaltiesRecipientAddress, _percentageBasisPoints);
    return true;    
  }

  // Utils
  function isContract(address account) private view returns (bool) {
    uint256 size;
    assembly {
      size := extcodesize(account)
    }
    return size > 0;
  }

  function toString(uint256 value) private pure returns (string memory) {
    // Inspired by OraclizeAPI's implementation - MIT licence
    // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

    if (value == 0) {
      return "0";
    }
    uint256 temp = value;
    uint256 digits;
    while (temp != 0) {
      digits++;
      temp /= 10;
    }
    bytes memory buffer = new bytes(digits);
    while (value != 0) {
      digits -= 1;
      buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
      value /= 10;
    }
    return string(buffer);
  }
}