// File: /Users/matiasbn/Desktop/stacktical/stacktical-dsla-contracts/contracts/PeriodRegistry.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.6.6;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @title SLARegistry
 * @dev SLARegistry is a contract for handling creation of service level
 * agreements and keeping track of the created agreements
 */
contract PeriodRegistry is Ownable {
    using SafeMath for uint256;

    enum PeriodType {Hourly, Daily, Weekly, BiWeekly, Monthly, Yearly}

    /// @dev struct to store the definition of a period
    struct PeriodDefinition {
        bool initialized;
        uint256[] starts;
        uint256[] ends;
    }

    /// @dev (periodType=>PeriodDefinition) hourly/weekly/biWeekly/monthly/yearly are periodTypes
    mapping(PeriodType => PeriodDefinition) public periodDefinitions;

    /**
     * @dev event to log a new period initialized
     *@param periodType 1. period type i.e. Hourly, Daily, Weekly, BiWeekly, Monthly, Yearly
     *@param periodsAdded 2. amount of periods added
     */
    event PeriodInitialized(PeriodType periodType, uint256 periodsAdded);

    /**
     * @dev event to log a new period initialized
     *@param periodType 1. period type i.e. Hourly, Daily, Weekly, BiWeekly, Monthly, Yearly
     *@param periodsAdded 2. amount of periods added
     */
    event PeriodModified(PeriodType periodType, uint256 periodsAdded);

    /**
     * @dev public function for creating canonical service level agreements
     *@param _periodType 1. period type i.e. Hourly, Daily, Weekly, BiWeekly, Monthly, Yearly
     *@param _periodStarts 2. array of the starts of the period
     *@param _periodEnds 3. array of the ends of the period
     */
    function initializePeriod(
        PeriodType _periodType,
        uint256[] memory _periodStarts,
        uint256[] memory _periodEnds
    ) public onlyOwner {
        PeriodDefinition storage periodDefinition =
            periodDefinitions[_periodType];
        require(
            !periodDefinition.initialized,
            "Period type already initialized"
        );
        require(
            _periodStarts.length == _periodEnds.length,
            "Period type starts and ends should match"
        );
        require(_periodStarts.length > 0, "Period length can't be 0");
        for (uint256 index = 0; index < _periodStarts.length; index++) {
            require(
                _periodStarts[index] < _periodEnds[index],
                "Start should be before end"
            );
            if (index < _periodStarts.length - 1) {
                require(
                    _periodStarts[index + 1].sub(_periodEnds[index]) == 1,
                    "Start of a period should be 1 second after the end of the previous period"
                );
            }
            periodDefinition.starts.push(_periodStarts[index]);
            periodDefinition.ends.push(_periodEnds[index]);
        }
        periodDefinition.initialized = true;
        emit PeriodInitialized(_periodType, _periodStarts.length);
    }

    /**
     * @dev function to add new periods to certain period type
     *@param _periodType 1. period type i.e. Hourly, Daily, Weekly, BiWeekly, Monthly, Yearly
     *@param _periodStarts 2. array of uint256 of the period starts to add
     *@param _periodEnds 3. array of uint256 of the period starts to add
     */
    function addPeriodsToPeriodType(
        PeriodType _periodType,
        uint256[] memory _periodStarts,
        uint256[] memory _periodEnds
    ) public onlyOwner {
        require(_periodStarts.length > 0, "Period length can't be 0");
        PeriodDefinition storage periodDefinition =
            periodDefinitions[_periodType];
        require(periodDefinition.initialized, "Period was not initialized yet");
        for (uint256 index = 0; index < _periodStarts.length; index++) {
            require(
                _periodStarts[index] < _periodEnds[index],
                "Start should be before end"
            );
            if (index < _periodStarts.length.sub(1)) {
                require(
                    _periodStarts[index + 1].sub(_periodEnds[index]) == 1,
                    "Start of a period should be 1 second after the end of the previous period"
                );
            }
            periodDefinition.starts.push(_periodStarts[index]);
            periodDefinition.ends.push(_periodEnds[index]);
        }
        emit PeriodModified(_periodType, _periodStarts.length);
    }

    /**
     * @dev public function to get the start and end of a period
     *@param _periodType 1. period type i.e. Hourly, Daily, Weekly, BiWeekly, Monthly, Yearly
     *@param _periodId 2. period id to get start and end
     */
    function getPeriodStartAndEnd(PeriodType _periodType, uint256 _periodId)
        public
        view
        returns (uint256 start, uint256 end)
    {
        start = periodDefinitions[_periodType].starts[_periodId];
        end = periodDefinitions[_periodType].ends[_periodId];
    }

    /**
     * @dev public function to check if a periodType id is initialized
     *@param _periodType 1. period type i.e. Hourly, Daily, Weekly, BiWeekly, Monthly, Yearly
     */
    function isInitializedPeriod(PeriodType _periodType)
        public
        view
        returns (bool initialized)
    {
        PeriodDefinition memory periodDefinition =
            periodDefinitions[_periodType];
        initialized = periodDefinition.initialized;
    }

    /**
     * @dev public function to check if a period id is valid i.e. it belongs to the added id array
     *@param _periodType 1. period type i.e. Hourly, Daily, Weekly, BiWeekly, Monthly, Yearly
     *@param _periodId 2. period id to get start and end
     */
    function isValidPeriod(PeriodType _periodType, uint256 _periodId)
        public
        view
        returns (bool valid)
    {
        PeriodDefinition memory periodDefinition =
            periodDefinitions[_periodType];
        valid = periodDefinition.starts.length.sub(1) >= _periodId;
    }

    /**
     * @dev public function to check if a period has finished
     *@param _periodType 1. period type i.e. Hourly, Daily, Weekly, BiWeekly, Monthly, Yearly
     *@param _periodId 2. period id to get start and end
     */
    function periodIsFinished(PeriodType _periodType, uint256 _periodId)
        public
        view
        returns (bool finished)
    {
        require(
            isValidPeriod(_periodType, _periodId),
            "Period data is not valid"
        );
        finished =
            periodDefinitions[_periodType].ends[_periodId] < block.timestamp;
    }

    /**
     * @dev public function to check if a period has started
     *@param _periodType 1. period type i.e. Hourly, Daily, Weekly, BiWeekly, Monthly, Yearly
     *@param _periodId 2. period id to get start and end
     */
    function periodHasStarted(PeriodType _periodType, uint256 _periodId)
        public
        view
        returns (bool started)
    {
        require(
            isValidPeriod(_periodType, _periodId),
            "Period data is not valid"
        );
        started =
            periodDefinitions[_periodType].starts[_periodId] < block.timestamp;
    }

    /**
     * @dev public function to get the periodDefinitions
     */
    function getPeriodDefinitions()
        public
        view
        returns (PeriodDefinition[] memory)
    {
        // 6 period types
        PeriodDefinition[] memory periodDefinition = new PeriodDefinition[](6);
        periodDefinition[0] = periodDefinitions[PeriodType.Hourly];
        periodDefinition[1] = periodDefinitions[PeriodType.Daily];
        periodDefinition[2] = periodDefinitions[PeriodType.Weekly];
        periodDefinition[3] = periodDefinitions[PeriodType.BiWeekly];
        periodDefinition[4] = periodDefinitions[PeriodType.Monthly];
        periodDefinition[5] = periodDefinitions[PeriodType.Yearly];
        return periodDefinition;
    }
}

// File: @openzeppelin/contracts/GSN/Context.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/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.
 */
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 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: @openzeppelin/contracts/math/SafeMath.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}