// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

/// @title ManifestRegistry - owner-scoped capability registry with version history
contract ManifestRegistry {
    address public immutable owner;
    uint256 public epoch;

    event Updated(uint256 indexed epoch, bytes32 indexed name, bytes32 manifestRoot, string meta);

    struct Entry { bytes32 manifestRoot; string meta; uint256 atEpoch; }

    mapping(bytes32 => Entry) public entries;
    mapping(bytes32 => mapping(uint256 => Entry)) public history;

    constructor() { owner = msg.sender; }

    function update(bytes32 name, bytes32 manifestRoot, string calldata meta) external {
        require(msg.sender == owner, "not owner");
        epoch++;
        entries[name] = Entry(manifestRoot, meta, epoch);
        history[name][epoch] = entries[name];
        emit Updated(epoch, name, manifestRoot, meta);
    }

    function resolve(bytes32 name) external view returns (bytes32 manifestRoot, string memory meta, uint256 atEpoch) {
        Entry storage e = entries[name];
        return (e.manifestRoot, e.meta, e.atEpoch);
    }
}