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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.33;

import { Sponsorship, SponsorshipQueue } from "./SponsorshipQueue.sol";
import { Distribution, DistributionQueue } from "./DistributionQueue.sol";
import { IDistributionVerifier } from "./interface/IDistributionVerifier.sol";
import { ProtocolVersion } from "./util/ProtocolVersion.sol";

/// @notice Handles pairing of sponsorships with distributions
contract QueueHandler is ProtocolVersion {
    address public owner;
    SponsorshipQueue public immutable sponsorshipQueue;
    DistributionQueue public immutable distributionQueue;
    IDistributionVerifier public distributionVerifier;

    event OwnerUpdated(address);
    event RolesUpdated(address);
    event DistributionVerifierUpdated(address);
    event QueuePairProcessed(uint24 distributionQueueNumber, uint24 sponsorshipQueueNumber, address indexed operator);
    event RejectedDistributionRemoved(uint24 queueNumber, address indexed operator);

    constructor(address sponsorshipQueue_, address distributionQueue_, address distributionVerifier_) {
        owner = msg.sender;
        sponsorshipQueue = SponsorshipQueue(sponsorshipQueue_);
        distributionQueue = DistributionQueue(distributionQueue_);
        distributionVerifier = IDistributionVerifier(distributionVerifier_);
    }

    function updateOwner(address owner_) public {
        require(msg.sender == owner, "Only the current owner can set a new owner");
        owner = owner_;
        emit OwnerUpdated(owner_);
    }

    function updateDistributionVerifier(address distributionVerifier_) public {
        require(msg.sender == owner, "Only the owner can set the `distributionVerifier` address");
        distributionVerifier = IDistributionVerifier(distributionVerifier_);
        emit DistributionVerifierUpdated(distributionVerifier_);
    }

    /// @notice Pair the next distribution (if approved) with the next sponsorship
    function processQueuePair() public {
        // Verify that the queue of distributions is not empty
        require(distributionQueue.getLength() > 0, "The distribution queue cannot be empty");

        // Get the next distribution in the queue
        uint24 distributionQueueNumber = distributionQueue.queueNumberFront();

        // Verify that the distribution has been approved
        require(distributionVerifier.isDistributionApproved(distributionQueueNumber), "Only approved distributions can be processed");

        // Verify that the queue of sponsorships is not empty
        require(sponsorshipQueue.getLength() > 0, "The sponsorship queue cannot be empty");

        // Remove the distribution from the queue
        Distribution memory distribution = distributionQueue.dequeue();

        // Remove the sponsorship from the queue
        uint24 sponsorshipQueueNumber = sponsorshipQueue.queueNumberFront();
        Sponsorship memory sponsorship = sponsorshipQueue.dequeue();

        // Transfer ETH from the sponsorship to the distributor
        sponsorshipQueue.payDistributor(distribution.distributor, sponsorship);

        // Emit event
        emit QueuePairProcessed(distributionQueueNumber, sponsorshipQueueNumber, msg.sender);
    }

    /// @notice Remove rejected distribution from the queue
    function removeRejectedDistribution() public {
        // Verify that the queue of distributions is not empty
        require(distributionQueue.getLength() > 0, "The distribution queue cannot be empty");

        // Verify that the next distribution in the queue has been rejected
        uint24 distributionQueueNumber = distributionQueue.queueNumberFront();
        bool isDistributionRejected = distributionVerifier.isDistributionRejected(distributionQueueNumber);
        require(isDistributionRejected, "Only rejected distributions can be removed from the queue");

        // Remove the distribution from the queue
        distributionQueue.dequeue();

        // Emit event
        emit RejectedDistributionRemoved(distributionQueueNumber, msg.sender);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.30;

interface ILanguages {
    function addSupportedLanguage(string calldata languageCode) external;
    function removeSupportedLanguage(string calldata languageCode) external;
    function isSupportedLanguage(string calldata languageCode) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.33;

import { IDistributionQueue } from "./interface/IDistributionQueue.sol";
import { ILanguages } from "@elimu-ai/dao-contracts/ILanguages.sol";
import { ProtocolVersion } from "./util/ProtocolVersion.sol";

struct Distribution {
    string languageCode;
    string androidId;
    uint256 timestamp;
    address distributor;
}

/// @notice A queue of distributions for the Ξlimu DAO's education sponsorship program (https://sponsors.elimu.ai)
contract DistributionQueue is IDistributionQueue, ProtocolVersion {
    address public owner;
    ILanguages public languages;
    address public queueHandler;
    mapping(uint24 => Distribution) public queue;
    uint24 public queueNumberFront = 1;
    uint24 public queueNumberNext = 1;

    event OwnerUpdated(address);
    event LanguagesUpdated(address);
    event QueueHandlerUpdated(address);
    event DistributionAdded(uint24 queueNumber, address indexed distributor);

    error InvalidLanguageCode();

    constructor(address languages_) {
        owner = msg.sender;
        languages = ILanguages(languages_);
    }

    function updateOwner(address owner_) public {
        require(msg.sender == owner, "Only the current owner can set a new owner");
        owner = owner_;
        emit OwnerUpdated(owner_);
    }

    function updateLanguages(address languages_) public {
        require(msg.sender == owner, "Only the owner can set the `languages` address");
        languages = ILanguages(languages_);
        emit LanguagesUpdated(languages_);
    }

    function updateQueueHandler(address queueHandler_) public {
        require(msg.sender == owner, "Only the owner can set the `queueHandler` address");
        queueHandler = queueHandler_;
        emit QueueHandlerUpdated(queueHandler_);
    }

    function addDistribution(string calldata languageCode, string calldata androidId) external {
        if (!languages.isSupportedLanguage(languageCode)) {
            revert InvalidLanguageCode();
        }
        Distribution memory distribution = Distribution(
            languageCode,
            androidId,
            block.timestamp,
            msg.sender
        );
        enqueue(distribution);
        emit DistributionAdded(queueNumberNext - 1, msg.sender);
    }

    function enqueue(Distribution memory sponsorship) private {
        queue[queueNumberNext] = sponsorship;
        queueNumberNext += 1;
    }

    function dequeue() public returns (Distribution memory) {
        require(msg.sender == queueHandler, "Only the queue handler can remove from the queue");
        require(getLength() > 0, "Queue is empty");
        Distribution memory distribution = queue[queueNumberFront];
        queueNumberFront += 1;
        return distribution;
    }

    function getLength() public view returns (uint256) {
        return queueNumberNext - queueNumberFront;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.33;

interface IDistributionQueue {
    /// @notice Add a new distribution to the queue
    /// @param languageCode The language code of the installed software (e.g. "HIN" for Hindi)
    /// @param androidId The hexadecimal Android ID of the distributed device (e.g. "5b7c682a12ecbe2e")
    function addDistribution(string calldata languageCode, string calldata androidId) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.33;

interface IDistributionVerifier {
    function isDistributionApproved(uint24 queueNumber) external view returns (bool);
    function isDistributionRejected(uint24 queueNumber) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.33;

interface ISponsorshipQueue {
    function estimatedCost() external view returns (uint256);
    function addSponsorship() external payable;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.33;

import { ISponsorshipQueue } from "./interface/ISponsorshipQueue.sol";
import { ProtocolVersion } from "./util/ProtocolVersion.sol";

struct Sponsorship {
    uint256 estimatedCost;
    uint256 timestamp;
    address sponsor;
}

/// @title A queue of sponsorships
/// @author Ξlimu DAO
/// @notice A queue of sponsorships for the Ξlimu DAO's education sponsorship program (https://sponsors.elimu.ai)
/// @dev The address of the queue handler smart contract needs to be set after deployment
contract SponsorshipQueue is ISponsorshipQueue, ProtocolVersion {
    address public owner;
    uint256 public estimatedCost;
    address public queueHandler;
    mapping(uint24 => Sponsorship) public queue;
    uint24 public queueNumberFront = 1;
    uint24 public queueNumberNext = 1;

    event OwnerUpdated(address);
    event EstimatedCostUpdated(uint256);
    event QueueHandlerUpdated(address);
    event SponsorshipAdded(uint24 queueNumber, address indexed sponsor);

    constructor(uint256 estimatedCost_) {
        owner = msg.sender;
        estimatedCost = estimatedCost_;
    }

    /// @notice Change the owner of this smart contract
    /// @param owner_ The address of the new owner
    function updateOwner(address owner_) public {
        require(msg.sender == owner, "Only the current owner can set a new owner");
        owner = owner_;
        emit OwnerUpdated(owner_);
    }

    /// @notice Update the amount that a sponsor will have to pay
    /// @param estimatedCost_ The new estimated cost
    function updateEstimatedCost(uint256 estimatedCost_) public {
        require(msg.sender == owner, "Only the owner can set the `estimatedCost`");
        estimatedCost = estimatedCost_;
        emit EstimatedCostUpdated(estimatedCost_);
    }

    /// @notice Change the handler of this queue
    /// @param queueHandler_ The address of the new queue handler smart contract
    function updateQueueHandler(address queueHandler_) public {
        require(msg.sender == owner, "Only the owner can set the `queueHandler` address");
        queueHandler = queueHandler_;
        emit QueueHandlerUpdated(queueHandler_);
    }

    /// @notice Pay ETH to this smart contract
    /// @dev The amount of ETH to pay can be changed by adjusting the `estimatedCost` variable
    function addSponsorship() external payable {
        require(msg.value == estimatedCost, "Must send exactly the estimated cost");
        Sponsorship memory sponsorship = Sponsorship(
            estimatedCost,
            block.timestamp,
            msg.sender
        );
        enqueue(sponsorship);
        emit SponsorshipAdded(queueNumberNext - 1, msg.sender);
    }

    /// @dev Internal function to add a sponsorship to the queue
    /// @param sponsorship The sponsorship to add
    function enqueue(Sponsorship memory sponsorship) private {
        queue[queueNumberNext] = sponsorship;
        queueNumberNext += 1;
    }

    /// @notice Remove and return the next sponsorship from the queue
    /// @dev Only callable by the queue handler
    /// @return The sponsorship that was removed from the front of the queue
    function dequeue() public returns (Sponsorship memory) {
        require(msg.sender == queueHandler, "Only the queue handler can remove from the queue");
        require(getLength() > 0, "Queue is empty");
        Sponsorship memory sponsorship = queue[queueNumberFront];
        queueNumberFront += 1;
        return sponsorship;
    }

    /// @notice Get the current length of the queue
    /// @return The number of sponsorships in the queue (that have not yet been processed)
    function getLength() public view returns (uint256) {
        return queueNumberNext - queueNumberFront;
    }

    /// @notice Transfer ETH from a sponsorship to a distributor
    /// @dev Only callable by the queue handler
    /// @param distributor The address to receive the ETH
    /// @param sponsorship The sponsorship containing the amount to transfer
    function payDistributor(address distributor, Sponsorship memory sponsorship) public {
        require(msg.sender == queueHandler, "Only the queue handler can process payouts");
        payable(distributor).transfer(sponsorship.estimatedCost);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.33;

abstract contract ProtocolVersion {
    function protocolVersion() public pure returns (string memory) {
        return "0.9.8";
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

[{"inputs":[{"internalType":"address","name":"sponsorshipQueue_","type":"address"},{"internalType":"address","name":"distributionQueue_","type":"address"},{"internalType":"address","name":"distributionVerifier_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"","type":"address"}],"name":"DistributionVerifierUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"","type":"address"}],"name":"OwnerUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint24","name":"distributionQueueNumber","type":"uint24"},{"indexed":false,"internalType":"uint24","name":"sponsorshipQueueNumber","type":"uint24"},{"indexed":true,"internalType":"address","name":"operator","type":"address"}],"name":"QueuePairProcessed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint24","name":"queueNumber","type":"uint24"},{"indexed":true,"internalType":"address","name":"operator","type":"address"}],"name":"RejectedDistributionRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"","type":"address"}],"name":"RolesUpdated","type":"event"},{"inputs":[],"name":"distributionQueue","outputs":[{"internalType":"contract DistributionQueue","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"distributionVerifier","outputs":[{"internalType":"contract IDistributionVerifier","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"processQueuePair","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"protocolVersion","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"removeRejectedDistribution","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"sponsorshipQueue","outputs":[{"internalType":"contract SponsorshipQueue","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"distributionVerifier_","type":"address"}],"name":"updateDistributionVerifier","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner_","type":"address"}],"name":"updateOwner","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000005f6052facba8107aaa0d6a2febe6cce0e7a4e62d000000000000000000000000beb5647b9435b082582a1a43da8edb9c40440e850000000000000000000000000a67e0fc963641945b2c02d7a6c4b1dfe0d2df99

-----Decoded View---------------
Arg [0] : sponsorshipQueue_ (address): 0x5F6052facBA8107aAa0D6A2febe6cce0E7A4E62d
Arg [1] : distributionQueue_ (address): 0xBEB5647B9435B082582a1a43da8Edb9C40440e85
Arg [2] : distributionVerifier_ (address): 0x0A67e0FC963641945B2C02d7A6c4b1DFE0D2DF99

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000005f6052facba8107aaa0d6a2febe6cce0e7a4e62d
Arg [1] : 000000000000000000000000beb5647b9435b082582a1a43da8edb9c40440e85
Arg [2] : 0000000000000000000000000a67e0fc963641945b2c02d7a6c4b1dfe0d2df99