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

import {Test, console} from "forge-std/Test.sol";
import {CCIPSender} from "../../contracts/ccip/CCIPSender.sol";
import {CCIPReceiver} from "../../contracts/ccip/CCIPReceiver.sol";
import {IRouterClient} from "../../contracts/ccip/IRouterClient.sol";

contract CCIPIntegrationTest is Test {
    CCIPSender public sender;
    CCIPReceiver public receiver;
    address public mockRouter;
    address public linkToken;
    
    uint64 constant SOURCE_CHAIN_SELECTOR = 138;
    uint64 constant TARGET_CHAIN_SELECTOR = 5009297550715157269; // Ethereum Mainnet
    
    event MessageSent(bytes32 indexed messageId, uint64 indexed destinationChainSelector, address receiver, bytes data);
    event MessageReceived(bytes32 indexed messageId, uint64 indexed sourceChainSelector, address sender, bytes data);
    
    function setUp() public {
        // Deploy mock router (in real tests, use actual CCIP Router)
        mockRouter = address(new MockRouter());
        linkToken = address(new MockLinkToken());
        
        // Deploy sender and receiver
        address oracleAggregator = address(this);
        sender = new CCIPSender(mockRouter, oracleAggregator, linkToken);
        receiver = new CCIPReceiver(mockRouter, oracleAggregator);
        
        // Fund sender with LINK
        MockLinkToken(linkToken).mint(address(sender), 1000e18);
        // Fund aggregator (test contract) with LINK - aggregator pays fees
        MockLinkToken(linkToken).mint(address(this), 1000e18);
    }
    
    function testSendMessage() public {
        // Add destination first
        sender.addDestination(TARGET_CHAIN_SELECTOR, address(receiver));
        
        // Approve sender to transfer LINK from aggregator (test contract)
        MockLinkToken(linkToken).approve(address(sender), 1000e18);
        
        bytes memory messageData = abi.encode(uint256(25000000000), uint256(1), uint256(block.timestamp));
        
        // Send oracle update (must be called by aggregator, which is address(this) in setUp)
        sender.sendOracleUpdate(TARGET_CHAIN_SELECTOR, 25000000000, 1, block.timestamp);
    }
    
    function testReceiveMessage() public {
        bytes memory messageData = abi.encode(uint256(25000000000), uint256(1), uint256(block.timestamp));
        
        IRouterClient.Any2EVMMessage memory message = IRouterClient.Any2EVMMessage({
            messageId: keccak256("test"),
            sourceChainSelector: SOURCE_CHAIN_SELECTOR,
            sender: abi.encode(address(sender)),
            data: messageData,
            tokenAmounts: new IRouterClient.TokenAmount[](0)
        });
        
        vm.prank(mockRouter);
        receiver.ccipReceive(message);
        
        assertTrue(receiver.processedMessages(keccak256("test")));
    }
    
    function testReplayProtection() public {
        bytes memory messageData = abi.encode(uint256(25000000000), uint256(1), uint256(block.timestamp));
        
        IRouterClient.Any2EVMMessage memory message = IRouterClient.Any2EVMMessage({
            messageId: keccak256("test"),
            sourceChainSelector: SOURCE_CHAIN_SELECTOR,
            sender: abi.encode(address(sender)),
            data: messageData,
            tokenAmounts: new IRouterClient.TokenAmount[](0)
        });
        
        vm.prank(mockRouter);
        receiver.ccipReceive(message);
        
        // Try to process same message again
        vm.prank(mockRouter);
        vm.expectRevert("CCIPReceiver: message already processed");
        receiver.ccipReceive(message);
    }
    
    function testFeeCalculation() public {
        // Add destination first (required for calculateFee)
        sender.addDestination(TARGET_CHAIN_SELECTOR, address(receiver));
        
        bytes memory messageData = abi.encode(uint256(25000000000), uint256(1), uint256(block.timestamp));
        
        uint256 fee = sender.calculateFee(TARGET_CHAIN_SELECTOR, messageData);
        
        assertGt(fee, 0, "Fee should be greater than 0");
    }
    
    function testInsufficientFee() public {
        // Add destination first
        sender.addDestination(TARGET_CHAIN_SELECTOR, address(receiver));
        
        // Drain aggregator's balance to cause insufficient fee
        MockLinkToken(linkToken).transfer(address(0xdead), 1000e18);
        
        // Must be called by aggregator (address(this) in setUp)
        vm.expectRevert();
        sender.sendOracleUpdate(TARGET_CHAIN_SELECTOR, 25000000000, 1, block.timestamp);
    }
}

// Mock contracts for testing
contract MockRouter is IRouterClient {
    function ccipSend(uint64, EVM2AnyMessage memory) external payable returns (bytes32, uint256) {
        return (keccak256("mock"), 0.01e18);
    }
    
    function getFee(uint64, EVM2AnyMessage memory) external pure returns (uint256) {
        return 0.01e18;
    }
    
    function getSupportedTokens(uint64) external pure returns (address[] memory) {
        return new address[](0);
    }
}

contract MockLinkToken {
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    
    function mint(address to, uint256 amount) external {
        balanceOf[to] += amount;
    }
    
    function transfer(address to, uint256 amount) external returns (bool) {
        require(balanceOf[msg.sender] >= amount, "Insufficient balance");
        balanceOf[msg.sender] -= amount;
        balanceOf[to] += amount;
        return true;
    }
    
    function transferFrom(address from, address to, uint256 amount) external returns (bool) {
        require(balanceOf[from] >= amount, "Insufficient balance");
        require(allowance[from][msg.sender] >= amount, "Insufficient allowance");
        balanceOf[from] -= amount;
        balanceOf[to] += amount;
        allowance[from][msg.sender] -= amount;
        return true;
    }
    
    function approve(address spender, uint256 amount) external returns (bool) {
        allowance[msg.sender][spender] = amount;
        return true;
    }
}