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

/**
 * @title FORGE ART — On-Chain SACM Agent Generative NFT
 * @notice Each token is a unique piece of ASCII art generated by a SnapKitty
 *         SACM agent, sealed to the WORM chain, stored entirely on-chain.
 *         No IPFS. No external dependencies. Art lives on Base forever.
 *
 * @dev ERC-721 with fully on-chain SVG tokenURI.
 *      Mint is gated by MINTER_ROLE — only the FORGE settlement bridge mints.
 *      Each mint records: agent name, WORM chain tip, SVG art, token seed.
 *      Art is deterministically reproducible from (agent, wormTip, tokenId).
 *
 * @custom:deployed-by SnapKitty Collective LLC — EIN 41-5105572
 * @custom:holding-entity Bel Esprit D'Accord Trust — EIN 41-6630640
 * @custom:legal UTILITY COLLECTIBLE ONLY. Not a security or investment instrument.
 */

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/Base64.sol";
import "@openzeppelin/contracts/utils/Strings.sol";

contract FORGEART is ERC721, ERC721Burnable, AccessControl {

    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    bytes32 public constant ARCHITECT_ROLE = keccak256("ARCHITECT_ROLE");

    uint256 public nextTokenId;
    uint256 public constant MAX_SUPPLY = 2_100;  // 1/10 of FORGE cap — scarce

    struct ArtToken {
        string agent;       // NOVA | ENKI | CIPHER | VAULT
        string wormTip;     // WORM chain tip at mint time (provenance)
        string tokenSeed;   // deterministic seed for off-chain reproduction
        string svgArt;      // full SVG stored on-chain
        uint256 mintedAt;
    }

    mapping(uint256 => ArtToken) public artTokens;
    mapping(string => uint256) public agentMintCount;

    event ArtMinted(
        uint256 indexed tokenId,
        address indexed recipient,
        string agent,
        string tokenSeed,
        string wormTip
    );

    constructor(address architect, address minter) ERC721("FORGE ART", "FART") {
        require(architect != address(0), "FORGEART: zero architect");
        require(minter != address(0),   "FORGEART: zero minter");
        _grantRole(DEFAULT_ADMIN_ROLE, architect);
        _grantRole(ARCHITECT_ROLE, architect);
        _grantRole(MINTER_ROLE, minter);
    }

    /**
     * @notice Mint a new FORGE ART token with fully on-chain SVG art.
     * @param recipient  Address receiving the NFT
     * @param agent      Agent name — "NOVA", "ENKI", "CIPHER", or "VAULT"
     * @param wormTip    WORM chain tip at time of sealing (provenance anchor)
     * @param tokenSeed  Deterministic seed — keccak256(agent:wormTip:tokenId)
     * @param svgArt     Complete SVG string to store on-chain
     */
    function mintArt(
        address recipient,
        string calldata agent,
        string calldata wormTip,
        string calldata tokenSeed,
        string calldata svgArt
    )
        external
        onlyRole(MINTER_ROLE)
    {
        require(nextTokenId < MAX_SUPPLY, "FORGEART: max supply reached");
        require(recipient != address(0), "FORGEART: zero recipient");
        require(bytes(agent).length > 0, "FORGEART: empty agent");
        require(bytes(svgArt).length > 0, "FORGEART: empty art");

        uint256 tokenId = nextTokenId++;
        artTokens[tokenId] = ArtToken({
            agent: agent,
            wormTip: wormTip,
            tokenSeed: tokenSeed,
            svgArt: svgArt,
            mintedAt: block.timestamp
        });
        agentMintCount[agent]++;

        _safeMint(recipient, tokenId);

        emit ArtMinted(tokenId, recipient, agent, tokenSeed, wormTip);
    }

    /**
     * @notice Returns fully on-chain tokenURI as a base64-encoded data URI.
     */
    function tokenURI(uint256 tokenId)
        public
        view
        override
        returns (string memory)
    {
        _requireOwned(tokenId);
        ArtToken storage art = artTokens[tokenId];

        string memory svgBase64 = Base64.encode(bytes(art.svgArt));

        string memory json = string(abi.encodePacked(
            '{"name":"FORGE ART #', Strings.toString(tokenId), ' - ', art.agent,
            '","description":"On-chain generative ASCII art sealed to the SnapKitty SACM WORM chain. Agent: ', art.agent,
            '. Every pixel is a proof of productive work.","image":"data:image/svg+xml;base64,', svgBase64,
            '","attributes":[',
                '{"trait_type":"Agent","value":"', art.agent, '"},',
                '{"trait_type":"WORM Tip","value":"', art.wormTip, '"},',
                '{"trait_type":"Token Seed","value":"', art.tokenSeed, '"},',
                '{"trait_type":"Minted At","value":', Strings.toString(art.mintedAt), '}',
            ']}'
        ))  ;

        return string(abi.encodePacked(
            'data:application/json;base64,',
            Base64.encode(bytes(json))
        ));
    }

    function remainingSupply() external view returns (uint256) {
        return MAX_SUPPLY - nextTokenId;
    }

    function supportsInterface(bytes4 interfaceId)
        public view override(ERC721, AccessControl)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }
}