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

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

/**
 * @title PacaBotManager
 * @dev A multicall contract that acts as a botOnly abstraction for PACA contracts
 * @notice This contract allows the owner to execute multiple bot-only functions across different PACA contracts
 */
contract PacaBotManager is Ownable, ReentrancyGuard {
    
    // Events
    event CallExecuted(address indexed target, bytes4 indexed selector, bool success);
    event MultiCallExecuted(uint256 callCount, uint256 successCount);
    
    // Errors
    error CallFailed(uint256 callIndex, address target, bytes data, bytes returnData);
    error EmptyCallData();
    error InvalidTarget();
    
    struct Call {
        address target;
        bytes callData;
    }
    
    struct CallResult {
        bool success;
        bytes returnData;
    }
    
    constructor() Ownable(msg.sender) {
        // Deployer is automatically the owner
    }
    
    /**
     * @notice Execute a single call to a target contract
     * @param target The contract address to call
     * @param callData The encoded function call data
     * @return success Whether the call succeeded
     * @return returnData The return data from the call
     */
    function executeCall(
        address target, 
        bytes calldata callData
    ) 
        external 
        onlyOwner 
        nonReentrant 
        returns (bool success, bytes memory returnData) 
    {
        if (target == address(0)) revert InvalidTarget();
        if (callData.length == 0) revert EmptyCallData();
        
        (success, returnData) = target.call(callData);
        
        // Emit event (selector extraction simplified for testing)
        emit CallExecuted(target, bytes4(0), success);
        
        return (success, returnData);
    }
    
    /**
     * @notice Execute multiple calls atomically - all must succeed or all revert
     * @param calls Array of Call structs containing target and callData
     * @return results Array of CallResult structs with success status and return data
     */
    function multiCallAtomic(Call[] calldata calls) 
        external 
        onlyOwner 
        nonReentrant 
        returns (CallResult[] memory results) 
    {
        uint256 length = calls.length;
        results = new CallResult[](length);
        
        for (uint256 i = 0; i < length; i++) {
            if (calls[i].target == address(0)) revert InvalidTarget();
            if (calls[i].callData.length == 0) revert EmptyCallData();
            
            (bool success, bytes memory returnData) = calls[i].target.call(calls[i].callData);
            
            if (!success) {
                revert CallFailed(i, calls[i].target, calls[i].callData, returnData);
            }
            
            results[i] = CallResult({
                success: success,
                returnData: returnData
            });
            
            // Emit event (selector extraction simplified for testing)
            emit CallExecuted(calls[i].target, bytes4(0), success);
        }
        
        emit MultiCallExecuted(length, length);
        return results;
    }
    
    /**
     * @notice Execute multiple calls with partial success allowed
     * @param calls Array of Call structs containing target and callData
     * @return results Array of CallResult structs with success status and return data
     */
    function multiCallPartial(Call[] calldata calls) 
        external 
        onlyOwner 
        nonReentrant 
        returns (CallResult[] memory results) 
    {
        uint256 length = calls.length;
        results = new CallResult[](length);
        uint256 successCount = 0;
        
        for (uint256 i = 0; i < length; i++) {
            if (calls[i].target == address(0) || calls[i].callData.length == 0) {
                results[i] = CallResult({
                    success: false,
                    returnData: abi.encode("Invalid target or empty call data")
                });
                continue;
            }
            
            (bool success, bytes memory returnData) = calls[i].target.call(calls[i].callData);
            
            results[i] = CallResult({
                success: success,
                returnData: returnData
            });
            
            if (success) {
                successCount++;
            }
            
            // Emit event (selector extraction simplified for testing)
            emit CallExecuted(calls[i].target, bytes4(0), success);
        }
        
        emit MultiCallExecuted(length, successCount);
        return results;
    }
    
    /**
     * @notice Convenience function to clear stakes for a user on a specific PACA contract
     * @param pacaContract The PACA contract address
     * @param user The user whose stakes will be cleared
     */
    function clearStakes(address pacaContract, address user) 
        external 
        onlyOwner 
        nonReentrant 
    {
        bytes memory callData = abi.encodeWithSignature("clearStakes(address)", user);
        (bool success, bytes memory returnData) = pacaContract.call(callData);
        
        if (!success) {
            revert CallFailed(0, pacaContract, callData, returnData);
        }
        
        emit CallExecuted(pacaContract, bytes4(0), success);
    }
    
    /**
     * @notice Convenience function to clear vestings for a user on a specific PACA contract
     * @param pacaContract The PACA contract address
     * @param user The user whose vestings will be cleared
     */
    function clearVesting(address pacaContract, address user) 
        external 
        onlyOwner 
        nonReentrant 
    {
        bytes memory callData = abi.encodeWithSignature("clearVesting(address)", user);
        (bool success, bytes memory returnData) = pacaContract.call(callData);
        
        if (!success) {
            revert CallFailed(0, pacaContract, callData, returnData);
        }
        
        emit CallExecuted(pacaContract, bytes4(0), success);
    }
    
    /**
     * @notice Convenience function to clear withdraw stakes for a user on a specific PACA contract
     * @param pacaContract The PACA contract address
     * @param user The user whose withdraw stakes will be cleared
     */
    function clearWithdrawStakes(address pacaContract, address user) 
        external 
        onlyOwner 
        nonReentrant 
    {
        bytes memory callData = abi.encodeWithSignature("clearWithdrawStakes(address)", user);
        (bool success, bytes memory returnData) = pacaContract.call(callData);
        
        if (!success) {
            revert CallFailed(0, pacaContract, callData, returnData);
        }
        
        emit CallExecuted(pacaContract, bytes4(0), success);
    }
    
    /**
     * @notice Emergency function to recover any accidentally sent ETH
     */
    function emergencyWithdrawETH() external onlyOwner {
        payable(owner()).transfer(address(this).balance);
    }
    
    /**
     * @notice Emergency function to recover any accidentally sent ERC20 tokens
     * @param token The token contract address
     * @param amount The amount to recover
     */
    function emergencyWithdrawToken(address token, uint256 amount) external onlyOwner {
        // Simple transfer call - assumes standard ERC20
        (bool success,) = token.call(
            abi.encodeWithSignature("transfer(address,uint256)", owner(), amount)
        );
        require(success, "Token transfer failed");
    }
}