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

import "../interfaces/IAssetTypeHandler.sol";
import "../../iso4217w/interfaces/IISO4217WToken.sol";

/**
 * @title ISO4217WHandler
 * @notice Handler for ISO-4217W eMoney/CBDC tokens with compliance checks
 */
contract ISO4217WHandler is IAssetTypeHandler {
    function validateAsset(address token) external view override returns (bool) {
        if (token.code.length == 0) return false;
        
        try IISO4217WToken(token).currencyCode() returns (string memory code) {
            // Verify it follows ISO-4217W format (e.g., USDW, EURW)
            bytes memory codeBytes = bytes(code);
            return codeBytes.length >= 4 && codeBytes[codeBytes.length - 1] == 'W';
        } catch {
            return false;
        }
    }

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

    function getDefaultLimits() external pure override returns (uint256 min, uint256 max) {
        return (100e18, 1000000e18); // 100 to 1M units
    }

    function preTransferHook(address from, address to, uint256 amount) external view override {
        // Compliance checks would go here
        // In practice, this would integrate with ComplianceGuard
        require(from != address(0) && to != address(0), "Invalid addresses");
        require(amount > 0, "Invalid amount");
    }

    function postTransferHook(address, address, uint256) external pure override {
        // Post-transfer compliance tracking if needed
    }
}
