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// SPDX-License-Identifier: MIT
pragma solidity 0.8.33;

/*
*++++++++=---=+---=++=========++++===========****+==+***+-:-========+++=-:-==============++***##***+-:-==-*####%%%%%%%*+
++++++===-----+-=+++++++=================---=****=-=+*#**+--=======++++++=-===========--=++==******+-.:-=-*#**#%%%@@@@#+
++++++===-----=-+++++*#*+===--========------=***###*+*####+=========+++++=-===========--=+***#*++++=--===--==*%%%@@@@%**
*+***+++==--==+-+++++*+++===:-=======---------+*##%%%##****============--:-==============+###*+-----=*##*=++++#%%@@@@%%%
++****++++**#*+-+++***====++=-=======----==---+*##%%%%%#**+=+++++====--:::-====---=======+****+=----+*++*+%@@@%%#*++*#%@
++****+++#@#*++---***+==========+++===--=++--=+*#%%%%%%+-+++++++++++++==-:-===-----======++*##*+=-=+**==+*%@@@@*------+#
++##+++++#%##*+-::*#***+----==++++====-=+**=-+**#%%%#*=--++=++++++=--==+=:-----------=====-+*#**+**+--++*##%%#+-------=+
++*+--==*#%%%+=-:-******==---=++++==--==++=-==+***##+-=+*:::=+++++-------::-:-------======+**+--+***-:+*###%%#+-----==-=
+++=---*%%%%*+=--==****#%#=---=====-===+++=--==+*##**#%%%+--:-++++==-----:--:------=--===+***-.:=+***==**#%%%%*:.:-+++-=
*+++==+####**+=-:-:=+*+++=---------========---=*###+-=*###+=--=+++++++=--------------:-==++++=::--==-=***=*#%#: .-++++=+
****+++****++++------==-----------=======----=+*#**+--=+++===========----:-----------:-==+===+++***++**#*-+*##-:-+++++=+
+++++++###*++++=======+***=--=-::::---------=%%%############-------------:-=====--==-----=+=======+++*##***+++++===+==-+
+++++++#%%*+++++=====+****=----:::::::::----=%%%%###########------------::-======+*+===-:=*+==--=++++**#**+====*#####+=+
+++++++#%#+++++=======++++------:--:::::----=%%%%%%%%#**####-----------:::-===++***+======*+=---==++**###*+====+###*++=*
++++++###*++++++==+++====----=---===---::::-=%%%%%%%#++*#**#----=======----===+****===========+====*####**======***+=++#
+===*****++++**+++++++*+----==--==++=--::::-=%%%#####**#*+**---=++====-------=+++++=========+*#*+++*###+++==+++=====+++#
=---+**********+++++++++-----=--====-:--::::=%%%%%%%%%#%*+**---======-----=--+++===-====-=++***++===+**==++**#***+++***#
=--=*****##****++++++++==---==--===-:::--:::-%%%%%%%%%%#****---===-------==-=++++===+++-:=+++*+=========+++#######**####
===++****##*++*+=======++=====-====---::::::-%%%###%%##*****===-:::::::---=-=======+++++--++++*+****+=+%%=+##########%%%
++++++++*+===**=======++++==----===-----:::.-##****#########+=-:::::::------=======+++++==+++*********@@%=*##*++++++***%
*****++++=-==++----==+++++=-----=====---:::.:###%%%%%%####%%=-:::::::--------====+++++++=+**###**+++=#@@%***#**++++****%
####**+++======-:--==++++=----=-=======--:::-##%@@@%%%%%%%%%==-------====-=-=++=-===--===+%%%%#*+=+++********#%%%%%@@@%%
*/

contract Progress {
    // Errors
    error NotOwner();
    error NoScripts();
    error SoldOut();
    error FreeMintSoldOut();
    error AlreadyFreeMinted();
    error InsufficientPayment();
    error ZeroQuantity();
    error NonexistentToken();
    error NotApproved();
    error InvalidTransfer();
    error FreeMintBlockCooldown();

    // Events
    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);

    // Constants
    uint256 public constant MAX_SUPPLY = 500;
    uint256 public constant COST = 0.001 ether;
    string public constant NAME = "Progress";
    string public constant SYMBOL = "PRO-GRESS";

    // State - packed into fewer slots
    address private _owner;
    uint96 private _currentIndex;

    string private _baseURI = "bafybeibpjn7eje2pekiy22lppfp2laycfajgmad2bhhuept6yct2xuqh2q";
    uint128 public MAX_FREE = 500;
    uint128 public MAX_FREE_PER_WALLET = 1;

    // Free mint throttle state
    uint256 public freeMintThrottleThreshold = 250;
    uint256 private _lastFreeMintBlock;

    // ERC721A-style: only store ownership at batch start
    mapping(uint256 => address) private _owners;
    mapping(address => uint256) private _balances;
    mapping(uint256 => address) private _tokenApprovals;
    mapping(address => mapping(address => bool)) private _operatorApprovals;
    mapping(address => uint256) public minted;

    modifier onlyOwner() {
        if (msg.sender != _owner) revert NotOwner();
        _;
    }

    modifier noContracts() {
        if (tx.origin != msg.sender) revert NoScripts();
        _;
    }

    constructor() {
        _owner = msg.sender;
    }

    // ============ MINT FUNCTIONS ============

    function freemint() external noContracts {
        uint256 amount = MAX_FREE_PER_WALLET;
        uint256 current = _currentIndex;
        if (current + amount > MAX_FREE) revert FreeMintSoldOut();
        if (current + amount > MAX_SUPPLY) revert SoldOut();
        if (minted[msg.sender] != 0) revert AlreadyFreeMinted();

        // After threshold, enforce 1 free mint per block
        if (current >= freeMintThrottleThreshold) {
            if (block.number == _lastFreeMintBlock) revert FreeMintBlockCooldown();
            _lastFreeMintBlock = block.number;
        }

        minted[msg.sender] = amount;
        _mint(msg.sender, amount);
    }

    function mint(uint256 amount) external payable {
        if (_currentIndex + amount > MAX_SUPPLY) revert SoldOut();
        if (msg.value < amount * COST) revert InsufficientPayment();
        _mint(msg.sender, amount);
    }

    function teamMint(uint256 amount) external onlyOwner {
        if (_currentIndex + amount > MAX_SUPPLY) revert SoldOut();
        _mint(msg.sender, amount);
    }

    /// @dev ERC721A-style: only write owner at start of batch
    function _mint(address to, uint256 quantity) internal {
        if (quantity == 0) revert ZeroQuantity();

        uint256 startId = _currentIndex;

        // Single SSTORE for ownership (ERC721A optimization)
        _owners[startId] = to;
        _balances[to] += quantity;

        // Emit events (required by ERC721 spec)
        for (uint256 i; i < quantity;) {
            emit Transfer(address(0), to, startId + i);
            unchecked { ++i; }
        }

        _currentIndex = uint96(startId + quantity);
    }

    // ============ VIEW FUNCTIONS ============

    function totalSupply() public view returns (uint256) {
        return _currentIndex;
    }

    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    /// @dev ERC721A-style: walk backwards to find owner
    function ownerOf(uint256 tokenId) public view returns (address) {
        if (tokenId >= _currentIndex) revert NonexistentToken();

        // Walk backwards to find the owner
        for (uint256 i = tokenId; ; ) {
            address tokenOwner = _owners[i];
            if (tokenOwner != address(0)) {
                return tokenOwner;
            }
            unchecked { --i; }
        }
    }

    function owner() public view returns (address) {
        return _owner;
    }

    /// @dev View function to check if a free mint is available in the current block
    function isFreeMintAvailableThisBlock() public view returns (bool) {
        if (_currentIndex >= freeMintThrottleThreshold) {
            return block.number != _lastFreeMintBlock;
        }
        return true;
    }

    /// @dev View the last block a free mint occurred
    function lastFreeMintBlock() public view returns (uint256) {
        return _lastFreeMintBlock;
    }

    function name() public pure returns (string memory) {
        return NAME;
    }

    function symbol() public pure returns (string memory) {
        return SYMBOL;
    }

    function tokenURI(uint256 tokenId) public view returns (string memory) {
        if (tokenId >= _currentIndex) revert NonexistentToken();
        return string(abi.encodePacked("ipfs://", _baseURI, "/", _toString(tokenId), ".json"));
    }

    // ============ APPROVALS ============

    function approve(address to, uint256 tokenId) public {
        address tokenOwner = ownerOf(tokenId);
        if (msg.sender != tokenOwner && !_operatorApprovals[tokenOwner][msg.sender])
            revert NotApproved();
        _tokenApprovals[tokenId] = to;
        emit Approval(tokenOwner, to, tokenId);
    }

    function setApprovalForAll(address operator, bool approved) public {
        _operatorApprovals[msg.sender][operator] = approved;
        emit ApprovalForAll(msg.sender, operator, approved);
    }

    function getApproved(uint256 tokenId) public view returns (address) {
        if (tokenId >= _currentIndex) revert NonexistentToken();
        return _tokenApprovals[tokenId];
    }

    function isApprovedForAll(address account, address operator) public view returns (bool) {
        return _operatorApprovals[account][operator];
    }

    // ============ TRANSFERS ============

    function transferFrom(address from, address to, uint256 tokenId) public {
        _transfer(from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId) public {
        _transfer(from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata) public {
        _transfer(from, to, tokenId);
    }

    function _transfer(address from, address to, uint256 tokenId) internal {
        if (ownerOf(tokenId) != from) revert InvalidTransfer();
        if (msg.sender != from && !_operatorApprovals[from][msg.sender] && _tokenApprovals[tokenId] != msg.sender)
            revert NotApproved();

        delete _tokenApprovals[tokenId];
        unchecked {
            --_balances[from];
            ++_balances[to];
        }

        // Write new owner
        _owners[tokenId] = to;

        // Initialize next slot if needed (ERC721A pattern)
        uint256 nextId = tokenId + 1;
        if (nextId < _currentIndex && _owners[nextId] == address(0)) {
            _owners[nextId] = from;
        }

        emit Transfer(from, to, tokenId);
    }

    // ============ ERC165 & ERC2981 ============

    function supportsInterface(bytes4 interfaceId) public pure returns (bool) {
        return interfaceId == 0x01ffc9a7 || // ERC165
               interfaceId == 0x80ac58cd || // ERC721
               interfaceId == 0x5b5e139f || // ERC721Metadata
               interfaceId == 0x2a55205a;   // ERC2981
    }

    function royaltyInfo(uint256, uint256 salePrice) external view returns (address, uint256) {
        return (_owner, (salePrice * 500) / 10000);
    }

    // ============ ADMIN ============

    function setData(string calldata base, uint128 maxFree, uint128 maxFreePerWallet) external onlyOwner {
        _baseURI = base;
        MAX_FREE = maxFree;
        MAX_FREE_PER_WALLET = maxFreePerWallet;
    }

    /// @dev Set the mint count threshold after which only 1 free mint per block is allowed
    /// @param threshold The new threshold value (e.g., 250 means throttling starts at mint #250)
    function setFreeMintThrottleThreshold(uint256 threshold) external onlyOwner {
        freeMintThrottleThreshold = threshold;
    }

    function withdraw() external onlyOwner {
        (bool success, ) = msg.sender.call{value: address(this).balance}("");
        require(success);
    }

    // ============ UTILS ============

    function _toString(uint256 value) internal pure returns (string memory) {
        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) {
            buffer[--digits] = bytes1(uint8(48 + value % 10));
            value /= 10;
        }
        return string(buffer);
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": []
}

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