//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract CeloPaints is ERC721Enumerable, Ownable {
    using Strings for uint256;

    string public baseURI;
    string public baseExtension = ".json";
    uint256 public cost = 22 ether;
    uint256 public maxSupply = 444;
    uint256 public maxMintAmount = 122;
    bool public paused = false;
    mapping(address => bool) public whitelisted;

    constructor(
        string memory _name,
        string memory _symbol,
        string memory _initBaseURI
    ) ERC721(_name, _symbol) {
        setBaseURI(_initBaseURI);
        mint(msg.sender, 115);
    }

    // internal
    function _baseURI() internal view virtual override returns (string memory) {
        return baseURI;
    }

    // public
    function mint(address _to, uint256 _mintAmount) public payable {
        uint256 supply = totalSupply();
        require(!paused, "Contract is paused. Please contact with contract owner.");
        require(_mintAmount > 0, "Mint amount should be 1 or more.");
        require(_mintAmount <= maxMintAmount, "Mint amount cannot be more than max mint amount.");
        require(supply + _mintAmount <= maxSupply, "Mint exceeds max supply.");

        if (msg.sender != owner()) {
            if (whitelisted[msg.sender] != true) {
                require(msg.value >= cost * _mintAmount);
            }
        }

        for (uint256 i = 1; i <= _mintAmount; i++) {
            _safeMint(_to, supply + i);
        }
    }

    function walletOfOwner(address _owner)
        public
        view
        returns (uint256[] memory)
    {
        uint256 ownerTokenCount = balanceOf(_owner);
        uint256[] memory tokenIds = new uint256[](ownerTokenCount);
        for (uint256 i; i < ownerTokenCount; i++) {
            tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
        }
        return tokenIds;
    }

    function tokenURI(uint256 tokenId)
        public
        view
        virtual
        override
        returns (string memory)
    {
        require(
            _exists(tokenId),
            "ERC721Metadata: URI query for nonexistent token"
        );

        string memory currentBaseURI = _baseURI();
        return
            bytes(currentBaseURI).length > 0
                ? string(
                    abi.encodePacked(
                        currentBaseURI,
                        tokenId.toString(),
                        baseExtension
                    )
                )
                : "";
    }

    //only owner
    function setCost(uint256 _newCost) public onlyOwner {
        cost = _newCost;
    }

    function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner {
        maxMintAmount = _newmaxMintAmount;
    }

    function setBaseURI(string memory _newBaseURI) public onlyOwner {
        baseURI = _newBaseURI;
    }

    function setBaseExtension(string memory _newBaseExtension)
        public
        onlyOwner
    {
        baseExtension = _newBaseExtension;
    }

    function pause(bool _state) public onlyOwner {
        paused = _state;
    }

    function whitelistUser(address _user) public onlyOwner {
        whitelisted[_user] = true;
    }

    function removeWhitelistUser(address _user) public onlyOwner {
        whitelisted[_user] = false;
    }

    function withdraw() public payable onlyOwner {
        require(payable(msg.sender).send(address(this).balance));
    }
}