// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "../compliance/LegallyCompliantBase.sol";

/**
 * @title CompliantUSDC
 * @notice USD Coin (Compliant) - ERC20 token with full legal compliance
 * @dev Inherits from LegallyCompliantBase for Travel Rules exemption and regulatory compliance exemption
 */
contract CompliantUSDC is ERC20, Pausable, Ownable, LegallyCompliantBase {
    uint8 private constant DECIMALS = 6;
    
    /**
     * @notice Constructor
     * @param initialOwner Address that will own the contract
     * @param admin Address that will receive DEFAULT_ADMIN_ROLE for compliance
     */
    constructor(
        address initialOwner,
        address admin
    )
        ERC20("USD Coin (Compliant)", "cUSDC")
        Ownable(initialOwner)
        LegallyCompliantBase(admin)
    {
        // Mint initial supply to deployer
        _mint(msg.sender, 1000000 * 10**DECIMALS);
    }
    
    /**
     * @notice Returns the number of decimals
     * @return Number of decimals (6 for USDC)
     */
    function decimals() public pure override returns (uint8) {
        return DECIMALS;
    }
    
    /**
     * @notice Internal transfer override with compliance tracking
     * @param from Source address
     * @param to Destination address
     * @param amount Transfer amount
     */
    function _update(
        address from,
        address to,
        uint256 amount
    ) internal override whenNotPaused {
        // Perform the transfer
        super._update(from, to, amount);
        
        // Emit compliant value transfer event
        if (from != address(0) && to != address(0)) {
            bytes32 legalRefHash = _generateLegalReferenceHash(
                from,
                to,
                amount,
                abi.encodePacked("cUSDC Transfer")
            );
            emit ValueTransferDeclared(from, to, amount, legalRefHash);
        }
    }
    
    /**
     * @notice Pause token transfers
     * @dev Only owner can pause
     */
    function pause() public onlyOwner {
        _pause();
    }
    
    /**
     * @notice Unpause token transfers
     * @dev Only owner can unpause
     */
    function unpause() public onlyOwner {
        _unpause();
    }
    
    /**
     * @notice Mint new tokens
     * @param to Address to mint tokens to
     * @param amount Amount of tokens to mint
     * @dev Only owner can mint
     */
    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }
    
    /**
     * @notice Burn tokens from caller's balance
     * @param amount Amount of tokens to burn
     */
    function burn(uint256 amount) public {
        _burn(msg.sender, amount);
    }
}