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/**
 *Submitted for verification at fraxscan.com on 2025-10-04
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

/// @title GasHog — intentionally gas-expensive operations
/// @notice Contains several functions that consume lots of gas:
///  - mass storage writes (push many items)
///  - nested hashing loops (compute-heavy)
///  - emitting many events
///  - inefficient array clearing (pop in a loop)
contract GasHog {
    // Large dynamic storage array — each push is expensive.
    uint256[] public data;

    // Event that will be emitted many times (also costs gas).
    event LogHeavy(uint256 indexed idx, bytes32 hash, address caller);

    /// @notice Pushes `count` pseudo-random numbers into storage.
    /// Each storage write (SSTORE) is expensive; pushing many items will use large gas.
    /// @param count number of pushes (bounded to avoid accidental infinite loops)
    function burnStorage(uint256 count) external {
        require(count <= 20000, "count too large"); // safety cap (you can increase locally)
        for (uint256 i = 0; i < count; ++i) {
            // pseudo-randomish value — each push writes to storage (expensive).
            data.push(uint256(keccak256(abi.encodePacked(block.timestamp, msg.sender, i))));
        }
    }

    /// @notice Runs nested hashing loops (pure compute).
    /// Heavy on EVM computation (SLOAD/SSTORE not used), still consumes gas proportionally.
    /// @param outer outer loop count (bounded)
    /// @param inner inner loop count (bounded)
    /// @return result an accumulated value derived from repeated keccak256
    function burnCompute(uint256 outer, uint256 inner) external pure returns (bytes32 result) {
        require(outer <= 1000 && inner <= 1000, "loops too large");
        bytes32 acc = bytes32(0);
        for (uint256 i = 0; i < outer; ++i) {
            for (uint256 j = 0; j < inner; ++j) {
                // performing keccak256 repeatedly is compute-heavy
                acc = keccak256(abi.encodePacked(acc, i, j));
            }
        }
        return acc;
    }

    /// @notice Emits `n` events. Each event write to the log is gas-consuming.
    /// @param n number of events to emit (bounded)
    function spamEvents(uint256 n) external {
        require(n <= 5000, "n too large");
        for (uint256 i = 0; i < n; ++i) {
            emit LogHeavy(i, keccak256(abi.encodePacked(block.timestamp, msg.sender, i)), msg.sender);
        }
    }

    /// @notice Inefficiently clears the `data` array by popping one-by-one.
    /// This uses more gas than resetting the length in some older patterns.
    /// (Note: in Solidity 0.8+, `delete data;` is cheaper; this intentionally uses pop loop.)
    function slowClear() external {
        while (data.length > 0) {
            data.pop(); // each pop is an SSTORE (clearing a storage slot) — costly when many elements exist
        }
    }

    /// @notice Combined heavy function: writes into storage, emits events, and does compute work.
    /// Use this to maximize gas cost in a single transaction.
    /// @param writes number of storage pushes
    /// @param events number of events to emit
    /// @param loops number of inner compute loops per write (bounded)
    function ultimateBurn(uint256 writes, uint256 events, uint256 loops) external {
        require(writes <= 5000 && events <= 2000 && loops <= 200, "params too large");
        for (uint256 i = 0; i < writes; ++i) {
            data.push(uint256(keccak256(abi.encodePacked(block.timestamp, msg.sender, i))));
            // a few compute iterations per write
            bytes32 h = bytes32(0);
            for (uint256 k = 0; k < loops; ++k) {
                h = keccak256(abi.encodePacked(h, i, k));
            }
            if (events > 0) {
                // emit an event occasionally (you can adjust frequency)
                emit LogHeavy(i, h, msg.sender);
            }
        }

        // do a burst of events at the end
        for (uint256 e = 0; e < events; ++e) {
            emit LogHeavy(e, keccak256(abi.encodePacked(block.number, msg.sender, e)), msg.sender);
        }
    }

    /// @notice Helper to read array length cheaply.
    function getDataLength() external view returns (uint256) {
        return data.length;
    }

    /// @notice Read element at index.
    function getDataAt(uint256 idx) external view returns (uint256) {
        return data[idx];
    }
}

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[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"idx","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"hash","type":"bytes32"},{"indexed":false,"internalType":"address","name":"caller","type":"address"}],"name":"LogHeavy","type":"event"},{"inputs":[{"internalType":"uint256","name":"outer","type":"uint256"},{"internalType":"uint256","name":"inner","type":"uint256"}],"name":"burnCompute","outputs":[{"internalType":"bytes32","name":"result","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"count","type":"uint256"}],"name":"burnStorage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"data","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"idx","type":"uint256"}],"name":"getDataAt","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getDataLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"slowClear","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"n","type":"uint256"}],"name":"spamEvents","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"writes","type":"uint256"},{"internalType":"uint256","name":"events","type":"uint256"},{"internalType":"uint256","name":"loops","type":"uint256"}],"name":"ultimateBurn","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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ipfs://2849b27ac1b4490c6ab3940d63b1b269468ef117d486873cfe1e0861da0d57c1