// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

/// @notice Timestamped prediction commitments. No stakes, payouts or custody.
contract RealityCommit {
    struct Commitment { uint256 committedAt; uint256 targetTime; bool revealed; }
    mapping(address => mapping(bytes32 => Commitment)) public commitments;
    event PredictionCommitted(address indexed contributor, bytes32 indexed commitment, uint256 targetTime);
    event PredictionRevealed(address indexed contributor, bytes32 indexed commitment, bytes predictionData);
    function commitPrediction(bytes32 commitment, uint256 targetTime) external {
        require(commitment != bytes32(0), 'EMPTY_HASH');
        require(targetTime > block.timestamp, 'TARGET_NOT_FUTURE');
        require(targetTime <= block.timestamp + 30 days, 'TARGET_TOO_FAR');
        require(commitments[msg.sender][commitment].committedAt == 0, 'DUPLICATE_COMMIT');
        commitments[msg.sender][commitment] = Commitment(block.timestamp, targetTime, false);
        emit PredictionCommitted(msg.sender, commitment, targetTime);
    }
    function revealPrediction(bytes calldata predictionData, bytes32 salt) external {
        require(predictionData.length <= 1024, 'DATA_TOO_LARGE');
        bytes32 digest = keccak256(abi.encode(predictionData, salt));
        Commitment storage entry = commitments[msg.sender][digest];
        require(entry.committedAt != 0, 'COMMIT_NOT_FOUND');
        require(!entry.revealed, 'ALREADY_REVEALED');
        require(block.timestamp >= entry.targetTime, 'TOO_EARLY');
        (address author, string memory asset, bool up, uint16 confidence, uint256 targetTime, uint256 generation) =
            abi.decode(predictionData, (address, string, bool, uint16, uint256, uint256));
        require(author == msg.sender && targetTime == entry.targetTime, 'METADATA_MISMATCH');
        require(bytes(asset).length > 0 && bytes(asset).length <= 16 && confidence <= 10000, 'INVALID_PREDICTION');
        up; generation;
        entry.revealed = true;
        emit PredictionRevealed(msg.sender, digest, predictionData);
    }
}