// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

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

// This contract receive ethers and split them according to each address share
contract RoyaltySplitter is Ownable {

	uint constant SHARE_MAX = 10000; // means 100%. A share of 100 means 1%, 1 means 0.01%

	uint _totalAmount; 		// total received
	uint _computedAmount;	// amount spread

	//Shares for each address
	mapping (uint256 => address) _addresses;
	mapping (uint256 => uint256) _shares;
	uint _totalHolders;

	//Pending withdrawals
	mapping (address => uint256) _pendingWithdrawals;


	//Constructor
	constructor() {
		_totalAmount = 0;
		_computedAmount = 0;
		
		_totalHolders = 0;
	}
		
    //Default receive
    receive() external payable {
	
		//Check overflow
		require (_totalAmount + msg.value > _totalAmount, "too many ethers sent");
	
        _totalAmount += msg.value;
    }
	
		
	//Init shares
	function setShares(address[] memory addresses, uint256[] memory shares) public onlyOwner {
		
		//Check sizes
		require (addresses.length == shares.length, "array sizes mismatch");
		require (addresses.length > 0, "empty array");
		
		//Check total shares
		uint totalShares = 0;
		for(uint i = 0; i < shares.length; i++) {
			require (totalShares + shares[i] > totalShares, "wrong share value");
			totalShares += shares[i];
		}
		
		require (totalShares == SHARE_MAX, "shares total value is not SHARE_MAX");
		
		//Spread current amount
		this.spreadAmount();
		
		//Store new holders and their shares
		_totalHolders = addresses.length;
		for(uint i = 0; i < _totalHolders; i++) {
			_addresses[i] = addresses[i];
			_shares[i] = shares[i];
		}
	}

	//Spread amount received since the last spread
	function spreadAmount() public {
	
		if (_totalHolders == 0) return;
	
		uint amountToSpread = _totalAmount - _computedAmount;
		if (amountToSpread < SHARE_MAX) return;
		
		amountToSpread /= SHARE_MAX; // minimum 1
		
		for(uint i = 0; i < _totalHolders; i++) {
			_pendingWithdrawals[_addresses[i]] += amountToSpread * _shares[i];
		}
	
		_computedAmount += amountToSpread * SHARE_MAX;
	}
	
	//Withdraw
	function withdraw() public {
	
		//Spread current amount
		this.spreadAmount();
		
		//Get receiver
		address payable receiver = payable(msg.sender);

		//Transfer
		uint amount = _pendingWithdrawals[receiver];
		_pendingWithdrawals[receiver] = 0;
		receiver.transfer(amount);
	}

	function availableToWithdraw() public view returns (uint256) {
		return _pendingWithdrawals[msg.sender];
	}
}