// File: contracts/protocol/configuration/LendingPoolAddressesProviderRegistry.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

import {Ownable} from "../../dependencies/openzeppelin/contracts/Ownable.sol";
import {ILendingPoolAddressesProviderRegistry} from "../../interfaces/ILendingPoolAddressesProviderRegistry.sol";
import {Errors} from "../libraries/helpers/Errors.sol";

/**
 * @title LendingPoolAddressesProviderRegistry contract
 * @dev Main registry of LendingPoolAddressesProvider of multiple Aave protocol's markets
 * - Used for indexing purposes of Aave protocol's markets
 * - The id assigned to a LendingPoolAddressesProvider refers to the market it is connected with,
 *   for example with `0` for the Aave main market and `1` for the next created
 * @author Aave
 **/
contract LendingPoolAddressesProviderRegistry is
    Ownable,
    ILendingPoolAddressesProviderRegistry
{
    mapping(address => uint256) private _addressesProviders;
    address[] private _addressesProvidersList;

    /**
     * @dev Returns the list of registered addresses provider
     * @return The list of addresses provider, potentially containing address(0) elements
     **/
    function getAddressesProvidersList()
        external
        view
        override
        returns (address[] memory)
    {
        address[] memory addressesProvidersList = _addressesProvidersList;

        uint256 maxLength = addressesProvidersList.length;

        address[] memory activeProviders = new address[](maxLength);

        for (uint256 i = 0; i < maxLength; i++) {
            if (_addressesProviders[addressesProvidersList[i]] > 0) {
                activeProviders[i] = addressesProvidersList[i];
            }
        }

        return activeProviders;
    }

    /**
     * @dev Registers an addresses provider
     * @param provider The address of the new LendingPoolAddressesProvider
     * @param id The id for the new LendingPoolAddressesProvider, referring to the market it belongs to
     **/
    function registerAddressesProvider(address provider, uint256 id)
        external
        override
        onlyOwner
    {
        require(id != 0, Errors.LPAPR_INVALID_ADDRESSES_PROVIDER_ID);

        _addressesProviders[provider] = id;
        _addToAddressesProvidersList(provider);
        emit AddressesProviderRegistered(provider);
    }

    /**
     * @dev Removes a LendingPoolAddressesProvider from the list of registered addresses provider
     * @param provider The LendingPoolAddressesProvider address
     **/
    function unregisterAddressesProvider(address provider)
        external
        override
        onlyOwner
    {
        require(
            _addressesProviders[provider] > 0,
            Errors.LPAPR_PROVIDER_NOT_REGISTERED
        );
        _addressesProviders[provider] = 0;
        emit AddressesProviderUnregistered(provider);
    }

    /**
     * @dev Returns the id on a registered LendingPoolAddressesProvider
     * @return The id or 0 if the LendingPoolAddressesProvider is not registered
     */
    function getAddressesProviderIdByAddress(address addressesProvider)
        external
        view
        override
        returns (uint256)
    {
        return _addressesProviders[addressesProvider];
    }

    function _addToAddressesProvidersList(address provider) internal {
        uint256 providersCount = _addressesProvidersList.length;

        for (uint256 i = 0; i < providersCount; i++) {
            if (_addressesProvidersList[i] == provider) {
                return;
            }
        }

        _addressesProvidersList.push(provider);
    }
}

// File: contracts/dependencies/openzeppelin/contracts/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/interfaces/ILendingPoolAddressesProviderRegistry.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

/**
 * @title LendingPoolAddressesProviderRegistry contract
 * @dev Main registry of LendingPoolAddressesProvider of multiple Aave protocol's markets
 * - Used for indexing purposes of Aave protocol's markets
 * - The id assigned to a LendingPoolAddressesProvider refers to the market it is connected with,
 *   for example with `0` for the Aave main market and `1` for the next created
 * @author Aave
 **/
interface ILendingPoolAddressesProviderRegistry {
    event AddressesProviderRegistered(address indexed newAddress);
    event AddressesProviderUnregistered(address indexed newAddress);

    function getAddressesProvidersList()
        external
        view
        returns (address[] memory);

    function getAddressesProviderIdByAddress(address addressesProvider)
        external
        view
        returns (uint256);

    function registerAddressesProvider(address provider, uint256 id) external;

    function unregisterAddressesProvider(address provider) external;
}

// File: contracts/protocol/libraries/helpers/Errors.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

/**
 * @title Errors library
 * @author Aave
 * @notice Defines the error messages emitted by the different contracts of the Aave protocol
 * @dev Error messages prefix glossary:
 *  - VL = ValidationLogic
 *  - AVL = Additional ValidationLogic
 *  - MATH = Math libraries
 *  - CT = Common errors between tokens (AToken, VariableDebtToken and StableDebtToken)
 *  - AT = AToken
 *  - SDT = StableDebtToken
 *  - VDT = VariableDebtToken
 *  - LP = LendingPool
 *  - LPAPR = LendingPoolAddressesProviderRegistry
 *  - LPC = LendingPoolConfiguration
 *  - RL = ReserveLogic
 *  - LPCM = LendingPoolCollateralManager
 *  - P = Pausable
 */
library Errors {
    //common errors
    string public constant CALLER_NOT_POOL_ADMIN = "33"; // 'The caller must be the pool admin'
    string public constant BORROW_ALLOWANCE_NOT_ENOUGH = "59"; // User borrows on behalf, but allowance are too small

    //contract specific errors
    string public constant VL_INVALID_AMOUNT = "1"; // 'Amount must be greater than 0'
    string public constant VL_NO_ACTIVE_RESERVE = "2"; // 'Action requires an active reserve'
    string public constant VL_RESERVE_FROZEN = "3"; // 'Action cannot be performed because the reserve is frozen'
    string public constant VL_CURRENT_AVAILABLE_LIQUIDITY_NOT_ENOUGH = "4"; // 'The current liquidity is not enough'
    string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "5"; // 'User cannot withdraw more than the available balance'
    string public constant VL_TRANSFER_NOT_ALLOWED = "6"; // 'Transfer cannot be allowed.'
    string public constant VL_BORROWING_NOT_ENABLED = "7"; // 'Borrowing is not enabled'
    string public constant VL_INVALID_INTEREST_RATE_MODE_SELECTED = "8"; // 'Invalid interest rate mode selected'
    string public constant VL_COLLATERAL_BALANCE_IS_0 = "9"; // 'The collateral balance is 0'
    string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD =
        "10"; // 'Health factor is lesser than the liquidation threshold'
    string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "11"; // 'There is not enough collateral to cover a new borrow'
    string public constant VL_STABLE_BORROWING_NOT_ENABLED = "12"; // stable borrowing not enabled
    string public constant VL_COLLATERAL_SAME_AS_BORROWING_CURRENCY = "13"; // collateral is (mostly) the same currency that is being borrowed
    string public constant VL_AMOUNT_BIGGER_THAN_MAX_LOAN_SIZE_STABLE = "14"; // 'The requested amount is greater than the max loan size in stable rate mode
    string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "15"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
    string public constant VL_NO_EXPLICIT_AMOUNT_TO_REPAY_ON_BEHALF = "16"; // 'To repay on behalf of an user an explicit amount to repay is needed'
    string public constant VL_NO_STABLE_RATE_LOAN_IN_RESERVE = "17"; // 'User does not have a stable rate loan in progress on this reserve'
    string public constant VL_NO_VARIABLE_RATE_LOAN_IN_RESERVE = "18"; // 'User does not have a variable rate loan in progress on this reserve'
    string public constant VL_UNDERLYING_BALANCE_NOT_GREATER_THAN_0 = "19"; // 'The underlying balance needs to be greater than 0'
    string public constant VL_DEPOSIT_ALREADY_IN_USE = "20"; // 'User deposit is already being used as collateral'
    string public constant LP_NOT_ENOUGH_STABLE_BORROW_BALANCE = "21"; // 'User does not have any stable rate loan for this reserve'
    string public constant LP_INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET = "22"; // 'Interest rate rebalance conditions were not met'
    string public constant LP_LIQUIDATION_CALL_FAILED = "23"; // 'Liquidation call failed'
    string public constant LP_NOT_ENOUGH_LIQUIDITY_TO_BORROW = "24"; // 'There is not enough liquidity available to borrow'
    string public constant LP_REQUESTED_AMOUNT_TOO_SMALL = "25"; // 'The requested amount is too small for a FlashLoan.'
    string public constant LP_INCONSISTENT_PROTOCOL_ACTUAL_BALANCE = "26"; // 'The actual balance of the protocol is inconsistent'
    string public constant LP_CALLER_NOT_LENDING_POOL_CONFIGURATOR = "27"; // 'The caller of the function is not the lending pool configurator'
    string public constant LP_INCONSISTENT_FLASHLOAN_PARAMS = "28";
    string public constant CT_CALLER_MUST_BE_LENDING_POOL = "29"; // 'The caller of this function must be a lending pool'
    string public constant CT_CANNOT_GIVE_ALLOWANCE_TO_HIMSELF = "30"; // 'User cannot give allowance to himself'
    string public constant CT_TRANSFER_AMOUNT_NOT_GT_0 = "31"; // 'Transferred amount needs to be greater than zero'
    string public constant RL_RESERVE_ALREADY_INITIALIZED = "32"; // 'Reserve has already been initialized'
    string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "34"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_ATOKEN_POOL_ADDRESS = "35"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_STABLE_DEBT_TOKEN_POOL_ADDRESS = "36"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_VARIABLE_DEBT_TOKEN_POOL_ADDRESS = "37"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_STABLE_DEBT_TOKEN_UNDERLYING_ADDRESS =
        "38"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_VARIABLE_DEBT_TOKEN_UNDERLYING_ADDRESS =
        "39"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_ADDRESSES_PROVIDER_ID = "40"; // 'The liquidity of the reserve needs to be 0'
    string public constant LPC_INVALID_CONFIGURATION = "75"; // 'Invalid risk parameters for the reserve'
    string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "76"; // 'The caller must be the emergency admin'
    string public constant LPAPR_PROVIDER_NOT_REGISTERED = "41"; // 'Provider is not registered'
    string public constant LPCM_HEALTH_FACTOR_NOT_BELOW_THRESHOLD = "42"; // 'Health factor is not below the threshold'
    string public constant LPCM_COLLATERAL_CANNOT_BE_LIQUIDATED = "43"; // 'The collateral chosen cannot be liquidated'
    string public constant LPCM_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "44"; // 'User did not borrow the specified currency'
    string public constant LPCM_NOT_ENOUGH_LIQUIDITY_TO_LIQUIDATE = "45"; // "There isn't enough liquidity available to liquidate"
    string public constant LPCM_NO_ERRORS = "46"; // 'No errors'
    string public constant LP_INVALID_FLASHLOAN_MODE = "47"; //Invalid flashloan mode selected
    string public constant MATH_MULTIPLICATION_OVERFLOW = "48";
    string public constant MATH_ADDITION_OVERFLOW = "49";
    string public constant MATH_DIVISION_BY_ZERO = "50";
    string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "51"; //  Liquidity index overflows uint128
    string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "52"; //  Variable borrow index overflows uint128
    string public constant RL_LIQUIDITY_RATE_OVERFLOW = "53"; //  Liquidity rate overflows uint128
    string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "54"; //  Variable borrow rate overflows uint128
    string public constant RL_STABLE_BORROW_RATE_OVERFLOW = "55"; //  Stable borrow rate overflows uint128
    string public constant CT_INVALID_MINT_AMOUNT = "56"; //invalid amount to mint
    string public constant LP_FAILED_REPAY_WITH_COLLATERAL = "57";
    string public constant CT_INVALID_BURN_AMOUNT = "58"; //invalid amount to burn
    string public constant LP_FAILED_COLLATERAL_SWAP = "60";
    string public constant LP_INVALID_EQUAL_ASSETS_TO_SWAP = "61";
    string public constant LP_REENTRANCY_NOT_ALLOWED = "62";
    string public constant LP_CALLER_MUST_BE_AN_ATOKEN = "63";
    string public constant LP_IS_PAUSED = "64"; // 'Pool is paused'
    string public constant LP_NO_MORE_RESERVES_ALLOWED = "65";
    string public constant LP_INVALID_FLASH_LOAN_EXECUTOR_RETURN = "66";
    string public constant RC_INVALID_LTV = "67";
    string public constant RC_INVALID_LIQ_THRESHOLD = "68";
    string public constant RC_INVALID_LIQ_BONUS = "69";
    string public constant RC_INVALID_DECIMALS = "70";
    string public constant RC_INVALID_RESERVE_FACTOR = "71";
    string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "72";
    string public constant VL_INCONSISTENT_FLASHLOAN_PARAMS = "73";
    string public constant LP_INCONSISTENT_PARAMS_LENGTH = "74";
    string public constant UL_INVALID_INDEX = "77";
    string public constant LP_NOT_CONTRACT = "78";
    string public constant SDT_STABLE_DEBT_OVERFLOW = "79";
    string public constant SDT_BURN_EXCEEDS_BALANCE = "80";

    string public constant AVL_EXCEED_MAX_GLOBAL_DEPOSIT_SIZE = "81";
    string public constant AVL_EXCEED_MAX_INDIVIDUAL_DEPOSIT_SIZE = "82";
    string public constant AVL_BELOW_MIN_INDIVIDUAL_DEPOSIT_SIZE = "83";
    string public constant AVL_EXCEED_MAX_GLOBAL_BORROW_SIZE = "84";
    string public constant AVL_EXCEED_MAX_INDIVIDUAL_BORROW_SIZE = "85";
    string public constant AVL_EXCEED_BORROW_MAX_PERCENTAGE = "86";
    string public constant AVL_INVALID_BORROW_MAX_PERCENTAGE = "87";

    string public constant LP_USER_IS_BLACKLISTED = "88";
    string public constant LP_USER_NOT_ELIGIBLE_FOR_BLACKLIST = "89";

    enum CollateralManagerErrors {
        NO_ERROR,
        NO_COLLATERAL_AVAILABLE,
        COLLATERAL_CANNOT_BE_LIQUIDATED,
        CURRRENCY_NOT_BORROWED,
        HEALTH_FACTOR_ABOVE_THRESHOLD,
        NOT_ENOUGH_LIQUIDITY,
        NO_ACTIVE_RESERVE,
        HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD,
        INVALID_EQUAL_ASSETS_TO_SWAP,
        FROZEN_RESERVE
    }
}

// File: contracts/dependencies/openzeppelin/contracts/Context.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}