// File: Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.3.2 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.7;


/**
 * @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;
	}
} 

// File: ERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.3.2 (token/ERC20/ERC20.sol)

pragma solidity ^0.8.7;

import "./IERC20.sol";
import "./Context.sol";
import "./IERC20Metadata.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
	mapping(address => uint256) private _balances;
	
	mapping(address => mapping(address => uint256)) private _allowances;
	
	uint256 private _maxSupply;
	uint256 private _totalSupply;
	uint256 private _totalBurned = 0;
	uint256 private _totalFees = 0;
	
	string private _name;
	string private _symbol;
	
	address private _feesAddress        = 0x17147745e20C49C4C27fA1472A33b1E56dc2cc44;
	address private _burnAddress        = 0x630eFD9DF80F4d981d08D85c70CCb9BD8a11AD9D;
	address private _liquidPoolAddress  = 0x604485b9333e90b83700939E038fF655E0E569C5;
	address private _prizesPoolAddress  = 0xD8C69Df5514ed472B323709c269c1E2Bec94C796;
	address private _holdersPoolAddress = 0xe07af194EDD94A5FAa3FE186159f4bE2826590b3;
	
	/**
	 * @dev Sets the values for {name} and {symbol}.
	 *
	 * The default value of {decimals} is 18. To select a different value for
	 * {decimals} you should overload it.
	 *
	 * All two of these values are immutable: they can only be set once during
	 * construction.
	 */
	constructor(string memory name_, string memory symbol_) {
		_name = name_;
		_symbol = symbol_;
	}
	
	/**
	 * @dev Returns the name of the token.
	 */
	function name() public view virtual override returns (string memory) {
		return _name;
	}
	
	/**
	 * @dev Returns the symbol of the token, usually a shorter version of the
	 * name.
	 */
	function symbol() public view virtual override returns (string memory) {
		return _symbol;
	}
	
	/**
	 * @dev Returns the number of decimals used to get its user representation.
	 * For example, if `decimals` equals `2`, a balance of `505` tokens should
	 * be displayed to a user as `5.05` (`505 / 10 ** 2`).
	 *
	 * Tokens usually opt for a value of 18, imitating the relationship between
	 * Ether and Wei. This is the value {ERC20} uses, unless this function is
	 * overridden;
	 *
	 * NOTE: This information is only used for _display_ purposes: it in
	 * no way affects any of the arithmetic of the contract, including
	 * {IERC20-balanceOf} and {IERC20-transfer}.
	 */
	function decimals() public view virtual override returns (uint8) {
		return 8;
	}
	
	/**
	 * @dev See {IERC20-maxSupply}.
	 */
	function maxSupply() public view virtual override returns (uint256) {
		return _maxSupply;
	}
	
	/**
	 * @dev See {IERC20-totalSupply}.
	 */
	function totalSupply() public view virtual override returns (uint256) {
		return _totalSupply;
	}
	/**
	 * @dev See {IERC20-totalSupply}.
	 */
	function totalBurned() public view virtual override returns (uint256) {
		return _totalBurned;
	}
	/**
	 * @dev See {IERC20-totalSupply}.
	 */
	function totalFees() public view virtual override returns (uint256) {
		return _totalFees;
	}
	
	/**
	 * @dev See {IERC20-balanceOf}.
	 */
	function balanceOf(address account) public view virtual override returns (uint256) {
		return _balances[account];
	}
	
	/**
	 * @dev See {IERC20-transfer}.
	 *
	 * Requirements:
	 *
	 * - `recipient` cannot be the zero address.
	 * - the caller must have a balance of at least `amount`.
	 */
	function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
		uint256 fees = _calculateFees(amount);
		uint256 amountAfterFees = amount - fees;
		_transfer(msg.sender, recipient, amountAfterFees);
		_deductFees(msg.sender, fees);
		return true;
	}
	
	/**
	 * @dev See {IERC20-allowance}.
	 */
	function allowance(address owner, address spender) public view virtual override returns (uint256) {
		return _allowances[owner][spender];
	}
	
	/**
	 * @dev See {IERC20-approve}.
	 *
	 * Requirements:
	 *
	 * - `spender` cannot be the zero address.
	 */
	function approve(address spender, uint256 amount) public virtual override returns (bool) {
		_approve(_msgSender(), spender, amount);
		return true;
	}
	
	/**
	 * @dev See {IERC20-transferFrom}.
	 *
	 * Emits an {Approval} event indicating the updated allowance. This is not
	 * required by the EIP. See the note at the beginning of {ERC20}.
	 *
	 * Requirements:
	 *
	 * - `sender` and `recipient` cannot be the zero address.
	 * - `sender` must have a balance of at least `amount`.
	 * - the caller must have allowance for ``sender``'s tokens of at least
	 * `amount`.
	 */
	function transferFrom(
		address sender,
		address recipient,
		uint256 amount
	) public virtual override returns (bool) {
		uint256 fees = _calculateFees(amount);
		uint256 amountAfterFees = amount - fees;
		_transfer(sender, recipient, amountAfterFees);
		_transfer(sender, _feesAddress, fees);
		
		uint256 currentAllowance = _allowances[sender][_msgSender()];
		require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
		unchecked {
			_approve(sender, _msgSender(), currentAllowance - amount);
		}
		
		return true;
	}
	
	/**
	 * @dev Atomically increases the allowance granted to `spender` by the caller.
	 *
	 * This is an alternative to {approve} that can be used as a mitigation for
	 * problems described in {IERC20-approve}.
	 *
	 * Emits an {Approval} event indicating the updated allowance.
	 *
	 * Requirements:
	 *
	 * - `spender` cannot be the zero address.
	 */
	function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
		_approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
		return true;
	}
	
	/**
	 * @dev Atomically decreases the allowance granted to `spender` by the caller.
	 *
	 * This is an alternative to {approve} that can be used as a mitigation for
	 * problems described in {IERC20-approve}.
	 *
	 * Emits an {Approval} event indicating the updated allowance.
	 *
	 * Requirements:
	 *
	 * - `spender` cannot be the zero address.
	 * - `spender` must have allowance for the caller of at least
	 * `subtractedValue`.
	 */
	function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
		uint256 currentAllowance = _allowances[_msgSender()][spender];
		require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
		unchecked {
			_approve(_msgSender(), spender, currentAllowance - subtractedValue);
		}
		
		return true;
	}
	
	/**
	 * @dev Moves `amount` of tokens from `sender` to `recipient`.
	 *
	 * This internal function is equivalent to {transfer}, and can be used to
	 * e.g. implement automatic token fees, slashing mechanisms, etc.
	 *
	 * Emits a {Transfer} event.
	 *
	 * Requirements:
	 *
	 * - `sender` cannot be the zero address.
	 * - `recipient` cannot be the zero address.
	 * - `sender` must have a balance of at least `amount`.
	 */
	
	function _transfer(
		address sender,
		address recipient,
		uint256 amount
	) internal virtual {
		require(sender != address(0), "ERC20: transfer from the zero address");
		require(recipient != address(0), "ERC20: transfer to the zero address");
		
		_beforeTokenTransfer(sender, recipient, amount);
		
		uint256 senderBalance = _balances[sender];
		require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
		unchecked {
			_balances[sender] = senderBalance - amount;
		}
		_balances[recipient] += amount;
		
		emit Transfer(sender, recipient, amount);
		
		_afterTokenTransfer(sender, recipient, amount);
	}
	
	/** @dev Creates `amount` tokens and assigns them to `account`, increasing
	 * the total supply.
	 *
	 * Emits a {Transfer} event with `from` set to the zero address.
	 *
	 * Requirements:
	 *
	 * - `account` cannot be the zero address.
	 */
	function _mint(address account, uint256 amount) internal virtual {
		require(account != address(0), "ERC20: mint to the zero address");
		
		_beforeTokenTransfer(address(0), account, amount);
		
		_totalSupply += amount;
		_maxSupply = _totalSupply;
		_balances[account] += amount;
		emit Transfer(address(0), account, amount);
		
		_afterTokenTransfer(address(0), account, amount);
	}
	
	/**
	 * @dev Destroys `amount` tokens from `account`, reducing the
	 * total supply.
	 *
	 * Emits a {Transfer} event with `to` set to the zero address.
	 *
	 * Requirements:
	 *
	 * - `account` cannot be the zero address.
	 * - `account` must have at least `amount` tokens.
	 */
	function _burn(address account, uint256 amount) internal virtual {
		require(account != address(0), "ERC20: burn from the zero address");
		
		_beforeTokenTransfer(account, address(0), amount);
		
		uint256 accountBalance = _balances[account];
		require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
		unchecked {
			//_balances[account] = accountBalance - amount;
			_transfer(account, address(0), amount);
		}
		_totalSupply -= amount;
		_totalBurned += amount;
		
		_afterTokenTransfer(account, address(0), amount);
	}
	
	/**
	 * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
	 *
	 * This internal function is equivalent to `approve`, and can be used to
	 * e.g. set automatic allowances for certain subsystems, etc.
	 *
	 * Emits an {Approval} event.
	 *
	 * Requirements:
	 *
	 * - `owner` cannot be the zero address.
	 * - `spender` cannot be the zero address.
	 */
	function _approve(
		address owner,
		address spender,
		uint256 amount
	) internal virtual {
		require(owner != address(0), "ERC20: approve from the zero address");
		require(spender != address(0), "ERC20: approve to the zero address");
		
		_allowances[owner][spender] = amount;
		emit Approval(owner, spender, amount);
	}
	
	/**
	 * @dev Hook that is called before any transfer of tokens. This includes
	 * minting and burning.
	 *
	 * Calling conditions:
	 *
	 * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
	 * will be transferred to `to`.
	 * - when `from` is zero, `amount` tokens will be minted for `to`.
	 * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
	 * - `from` and `to` are never both zero.
	 *
	 * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
	 */
	function _beforeTokenTransfer(
		address from,
		address to,
		uint256 amount
	) internal virtual {
		
	}
	
	/**
	 * @dev Hook that is called after any transfer of tokens. This includes
	 * minting and burning.
	 *
	 * Calling conditions:
	 *
	 * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
	 * has been transferred to `to`.
	 * - when `from` is zero, `amount` tokens have been minted for `to`.
	 * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
	 * - `from` and `to` are never both zero.
	 *
	 * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
	 */
	function _afterTokenTransfer(
		address from,
		address to,
		uint256 amount
	) internal virtual {
		
	}
	
	/**
	 * Calculates fees to be charged AFTER {_transfer} is successful.
	 * 
	 * 
	 * 
	 */
	function _calculateFees(uint256 amount) internal virtual returns (uint256) {
		uint256 burnFee   = (amount / 10000) * 456;
		uint256 holdFee   = (amount / 10000) * 456;
		uint256 liquidFee = (amount / 10000) * 228;
		uint256 prizeFee  = (amount / 10000) * 228;
		
		return (holdFee + burnFee + liquidFee + prizeFee);
	}
	
	/**
	 * Calculates fees to be charged AFTER {_transfer} is successful.
	 * 
	 * 
	 * 
	 */
	function _deductFees(address sender, uint256 amount) internal virtual returns (bool) {
		_transfer(sender, _feesAddress, amount);
		
		_totalFees += amount;
		emit FeesCollected(sender, amount/3, amount/3, amount/6, amount/6);
		
		_redistributeFees();
		
		return true;
	}
	
	/**
	 * Calculates fees to be charged AFTER {_transfer} is successful.
	 * 
	 * 
	 * 
	 */
	function _redistributeFees() internal virtual returns (bool){
		uint256 feesBalance = _balances[_feesAddress];
		if(feesBalance >= (10**decimals())*1000000) {
			_transfer(_feesAddress, _burnAddress, feesBalance/3);
			_transfer(_feesAddress, _liquidPoolAddress, feesBalance/3);
			_transfer(_feesAddress, _holdersPoolAddress, feesBalance/6);
			_transfer(_feesAddress, _prizesPoolAddress, feesBalance/6);
			
			emit FeesRedistributed(_feesAddress, feesBalance/3, feesBalance/3, feesBalance/6, feesBalance/6);
		}
		
		uint256 burnBalance = _balances[_burnAddress];
		if(burnBalance >= (10**decimals())*10000000) {
			_burn(_burnAddress, burnBalance);
			
			emit Burn(_burnAddress, feesBalance);
		}
		
		
		return true;
	}
} 

// File: ERC20Burnable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.3.2 (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.7;

import "./ERC20.sol";
import "./Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
	/**
	 * @dev Destroys `amount` tokens from the caller.
	 *
	 * See {ERC20-_burn}.
	 */
	function burn(uint256 amount) public virtual {
		_burn(_msgSender(), amount);
	}
	
	/**
	 * @dev Destroys `amount` tokens from `account`, deducting from the caller's
	 * allowance.
	 *
	 * See {ERC20-_burn} and {ERC20-allowance}.
	 *
	 * Requirements:
	 *
	 * - the caller must have allowance for ``accounts``'s tokens of at least
	 * `amount`.
	 */
	function burnFrom(address account, uint256 amount) public virtual {
		uint256 currentAllowance = allowance(account, _msgSender());
		require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
		unchecked {
			_approve(account, _msgSender(), currentAllowance - amount);
		}
		_burn(account, amount);
	}
} 

// File: IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.3.2 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.7;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
	
	/**
	 * @dev Returns the maximum amount of tokens ever existed.
	 */
	function maxSupply() external view returns (uint256);
	
	/**
	 * @dev Returns the amount of tokens in existence.
	 */
	function totalSupply() external view returns (uint256);
	
	/**
	 * @dev Returns the total amount of tokens burned.
	 */
	function totalBurned() external view returns (uint256);
	
	/**
	 * @dev Returns the total amount of fees collected.
	 */
	function totalFees() external view returns (uint256);
	
	/**
	 * @dev Returns the amount of tokens owned by `account`.
	 */
	function balanceOf(address account) external view returns (uint256);
	
	/**
	 * @dev Moves `amount` tokens from the caller's account to `recipient`.
	 *
	 * Returns a boolean value indicating whether the operation succeeded.
	 *
	 * Emits a {Transfer} event.
	 */
	function transfer(address recipient, uint256 amount) external returns (bool);
	
	/**
	 * @dev Returns the remaining number of tokens that `spender` will be
	 * allowed to spend on behalf of `owner` through {transferFrom}. This is
	 * zero by default.
	 *
	 * This value changes when {approve} or {transferFrom} are called.
	 */
	function allowance(address owner, address spender) external view returns (uint256);
	
	/**
	 * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
	 *
	 * Returns a boolean value indicating whether the operation succeeded.
	 *
	 * IMPORTANT: Beware that changing an allowance with this method brings the risk
	 * that someone may use both the old and the new allowance by unfortunate
	 * transaction ordering. One possible solution to mitigate this race
	 * condition is to first reduce the spender's allowance to 0 and set the
	 * desired value afterwards:
	 * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
	 *
	 * Emits an {Approval} event.
	 */
	function approve(address spender, uint256 amount) external returns (bool);
	
	/**
	 * @dev Moves `amount` tokens from `sender` to `recipient` using the
	 * allowance mechanism. `amount` is then deducted from the caller's
	 * allowance.
	 *
	 * Returns a boolean value indicating whether the operation succeeded.
	 *
	 * Emits a {Transfer} event.
	 */
	function transferFrom(
		address sender,
		address recipient,
		uint256 amount
	) external returns (bool);
	
	/**
	 * @dev Emitted when `value` tokens are moved from one account (`from`) to
	 * another (`to`).
	 *
	 * Note that `value` may be zero.
	 */
	event Transfer(address indexed from, address indexed to, uint256 value);
	
	/**
	 * @dev Emitted when the allowance of a `spender` for an `owner` is set by
	 * a call to {approve}. `value` is the new allowance.
	 */
	event Approval(address indexed owner, address indexed spender, uint256 value);
	
	event Burn(address indexed account, uint256 amount);
	
	event FeesCollected(address indexed account, uint256 burn, uint256 liquid, uint256 hold, uint256 prize);
	
	event FeesRedistributed(address indexed account, uint256 burn, uint256 liquid, uint256 hold, uint256 prize);
}

// File: IERC20Metadata.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.3.2 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.7;

import "./IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
	/**
	 * @dev Returns the name of the token.
	 */
	function name() external view returns (string memory);
	
	/**
	 * @dev Returns the symbol of the token.
	 */
	function symbol() external view returns (string memory);
	
	/**
	 * @dev Returns the decimals places of the token.
	 */
	function decimals() external view returns (uint8);
} 

// File: SQUIDToken.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.3.2 (token/ERC20/ERC20.sol)

pragma solidity ^0.8.7;

import "./ERC20.sol";
import "./ERC20Burnable.sol";

contract SQUIDToken is ERC20, ERC20Burnable {
	address private _owner; // 0xb67d2b22532B7CbFadb4aDcf0F5Af172923dC02C
	uint256 private _feesCollected = 0;
	
	constructor(
		string memory name_,
		string memory symbol_,
		uint256 totalSupply_
		
	) ERC20(name_, symbol_) {
		_owner             = msg.sender;
		uint256 totalSupply = (10**decimals())*totalSupply_;
		_mint(msg.sender, totalSupply);
	}
}



// File: TokenSwap.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "./IERC20.sol";

contract TokenSwap {
	IERC20 public token1;
	address public owner1;
	uint public amount1;
	IERC20 public token2;
	address public owner2;
	uint public amount2;
	
	constructor(
		address _token1,
		address _owner1,
		uint _amount1,
		address _token2,
		address _owner2,
		uint _amount2
	) {
		token1  = IERC20(_token1);
		owner1  = _owner1;
		amount1 = _amount1;
		token2  = IERC20(_token2);
		owner2  = _owner2;
		amount2 = _amount2;
	} 
	
	function swap() public {
		require(msg.sender == owner1 || msg.sender == owner2, "Not Authorized.");
		require(token1.allowance(owner1, address(this)) >= amount1, "Token 1 allowance insufficient.");
		require(token2.allowance(owner2, address(this)) >= amount2, "Token 2 allowance insufficient.");
		_safeTransferFrom(token1, owner1, owner2, amount1);
		_safeTransferFrom(token2, owner2, owner1, amount2);
	}
	
	
	function _safeTransferFrom(
		IERC20 token,
		address sender,
		address recipient,
		uint amount
	) private {
		bool sent = token.transferFrom(sender, recipient, amount);
		require(sent, "Token transfer failed.");
	}
}