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

import "../interfaces/IAssetTypeHandler.sol";

/**
 * @title SecurityHandler
 * @notice Handler for tokenized securities with accredited investor requirements
 */
contract SecurityHandler is IAssetTypeHandler {
    // In production, this would integrate with accredited investor registry
    mapping(address => bool) public accreditedInvestors;
    
    function validateAsset(address token) external view override returns (bool) {
        if (token.code.length == 0) return false;
        
        // Additional security token validation
        // Could check for compliance with standards like ERC-3643 (T-REX)
        return true;
    }

    function getRequiredCompliance() external pure override returns (UniversalAssetRegistry.ComplianceLevel) {
        return UniversalAssetRegistry.ComplianceLevel.Accredited;
    }

    function getDefaultLimits() external pure override returns (uint256 min, uint256 max) {
        return (1e18, 100000e18); // 1 to 100K securities
    }

    function preTransferHook(address from, address to, uint256 amount) external view override {
        // Verify accredited investor status
        if (from != address(0)) {
            require(accreditedInvestors[from], "Sender not accredited");
        }
        if (to != address(0)) {
            require(accreditedInvestors[to], "Recipient not accredited");
        }
        require(amount > 0, "Invalid amount");
    }

    function postTransferHook(address, address, uint256) external pure override {
        // Post-transfer compliance tracking (e.g., T+2 settlement)
    }
    
    // Admin function to set accredited status (in production, would be permissioned)
    function setAccreditedStatus(address investor, bool status) external {
        accreditedInvestors[investor] = status;
    }
}
