new_PHB.sol

pragma solidity 0.6.8;

interface iBEP20 {
  /**
   * @dev Returns the amount of tokens in existence.
   */
  function totalSupply() external view returns (uint256);

  /**
   * @dev Returns the token decimals.
   */
  function decimals() external view returns (uint8);

  /**
   * @dev Returns the token symbol.
   */
  function symbol() external view returns (string memory);

  /**
  * @dev Returns the token name.
  */
  function name() external view returns (string memory);

  /**
   * @dev Returns the bep token owner.
   */
  function getOwner() external view returns (address);

  /**
   * @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);
}


interface PHBOld {
    /**
    * @dev Destroys `amount` old PHB tokens from the caller.
    */
    function burnFrom(address account, uint256 amount) external;
    
    function balanceOf(address account) external view returns (uint256);
}


/*
 * @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.
 */
contract Context {
  // Empty internal constructor, to prevent people from mistakenly deploying
  // an instance of this contract, which should be used via inheritance.
  constructor () internal { }

  function _msgSender() internal view returns (address payable) {
    return msg.sender;
  }

  function _msgData() internal view returns (bytes memory) {
    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
    return msg.data;
  }
}

/**
 * @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) {
    // Solidity only automatically asserts when dividing by 0
    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;
  }
}

/**
 * @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 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 onlyOwner {
    _transferOwnership(newOwner);
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   */
  function _transferOwnership(address newOwner) internal {
    require(newOwner != address(0), "Ownable: new owner is the zero address");
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

interface ERC677Receiver {
  function onTokenTransfer(address _sender, uint _value, bytes calldata _data) external;
}


contract BEP20PHB is Context, iBEP20, Ownable {
  using SafeMath for uint256;

  mapping (address => uint256) private _balances;

  mapping (address => mapping (address => uint256)) private _allowances;

  uint256 private _totalSupply;
  uint256 private _inflationRate;
  uint256 private _lastInflationTime;
  uint8 public _decimals;
  string public _symbol;
  string public _name;
  uint256 public _inflationInitialAmount;
  
  address private _inflationAddress;
  address private _oldPHBAddress;
  address private _oldPHXAddress;
  
  PHBOld private _oldPHB;
  PHBOld private _oldPHX;

  constructor(address oldPHB,address oldPHX,uint256 startTime,uint256 inflationInitialAmount) public {
    _name = 'Phoenix Global';
    _symbol = 'PHB';
    _decimals = 18;
    _totalSupply = 0; 
    _balances[msg.sender] = _totalSupply;
    _lastInflationTime=startTime;
    _inflationRate=261157876;
    _oldPHB = PHBOld(oldPHB);
    _oldPHBAddress = oldPHB;
    _oldPHX = PHBOld(oldPHX);
    _oldPHXAddress = oldPHX;
    _inflationAddress=owner();
    _inflationInitialAmount=inflationInitialAmount;

    emit Transfer(address(0), msg.sender, _totalSupply);
  }

  /**
   * @dev Returns the bep token owner.
   */
  function getOwner() external view virtual override returns (address) {
    return owner();
  }

  /**
   * @dev Returns the token decimals.
   */
  function decimals() external view virtual override returns (uint8) {
    return _decimals;
  }

  /**
   * @dev Returns the token symbol.
   */
  function symbol() external view virtual override returns (string memory) {
    return _symbol;
  }

  /**
  * @dev Returns the token name.
  */
  function name() external view virtual override returns (string memory) {
    return _name;
  }

  /**
   * @dev See {BEP20-totalSupply}.
   */
  function totalSupply() external view virtual override returns (uint256) {
    return _totalSupply;
  }

  /**
   * @dev See {BEP20-balanceOf}.
   */
  function balanceOf(address account) external view virtual override returns (uint256) {
    return _balances[account];
  }
  
  /**
   * @dev See {BEP20-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 override returns (bool) {
    _transfer(_msgSender(), recipient, amount);
    return true;
  }
  

  /**
   * @dev See {BEP20-allowance}.
   */
  function allowance(address owner, address spender) external view override returns (uint256) {
    return _allowances[owner][spender];
  }

  /**
   * @dev See {BEP20-approve}.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   */
  function approve(address spender, uint256 amount) external override returns (bool) {
    _approve(_msgSender(), spender, amount);
    return true;
  }

  /**
   * @dev See {BEP20-transferFrom}.
   *
   * Emits an {Approval} event indicating the updated allowance. This is not
   * required by the EIP. See the note at the beginning of {BEP20};
   *
   * 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) external override returns (bool) {
    _transfer(sender, recipient, amount);
    _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "BEP20: transfer amount exceeds allowance"));
    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 {BEP20-approve}.
   *
   * Emits an {Approval} event indicating the updated allowance.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   */
  function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
    _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(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 {BEP20-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 returns (bool) {
    _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "BEP20: decreased allowance below zero"));
    return true;
  }

 /**
   * @dev Creates `amount` tokens and assigns them to `msg.sender`, increasing
   * the total supply.
   *
   * Requirements
   *
   * - `msg.sender` must be the token owner
   */
  function mint(uint256 amount) public onlyOwner returns (bool) {
    _mint(_msgSender(), amount);
    return true;
  }

    /**
    * @dev Destroys `amount` tokens from the caller.
    *
    * See {BEP20-_burn}.
    */
  function burn(uint256 amount) public virtual {
      _burn(_msgSender(), amount);
  }

  /**
    * @dev Destroys `amount` tokens from `account`, deducting from the caller's
    * allowance.
    *
    * See {BEP20-_burn} and {BEP20-allowance}.
    *
    * Requirements:
    *
    * - the caller must have allowance for ``accounts``'s tokens of at least
    * `amount`.
    */
  function burnFrom(address account, uint256 amount) public virtual {
      uint256 decreasedAllowance = _allowances[account][_msgSender()].sub(amount, "BEP20: burn amount exceeds allowance");

      _approve(account, _msgSender(), decreasedAllowance);
      _burn(account, amount);
  }


  /**
   * @dev Moves tokens `amount` from `sender` to `recipient`.
   *
   * This is 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 {
    require(sender != address(0), "BEP20: transfer from the zero address");
    require(recipient != address(0), "BEP20: transfer to the zero address");

    _balances[sender] = _balances[sender].sub(amount, "BEP20: transfer amount exceeds balance");
    _balances[recipient] = _balances[recipient].add(amount);
    emit Transfer(sender, recipient, amount);
  }
  
  /** 
   * @dev Convert `amount` old PHB tokens to new PHB tokens by 1% rate. 
   *
   * Requirements
   *
   * - `amount` must be more than zero and no more than balance.
   */
  function convertPHB(uint256 amount) external{
    require(amount > 0 , "BEP20: convert amount not more than zero");
    uint256 balance = _oldPHB.balanceOf(_msgSender());
    require(balance >= amount , "BEP20: convert amount more than balance");
    
    uint256 balanceBefore = _balances[_msgSender()];
    _oldPHB.burnFrom(_msgSender(), amount);
    _mint(_msgSender(), amount.div(100));
    uint256 balanceAfter = _balances[_msgSender()];
    require(balanceAfter-balanceBefore <= amount.div(100) , "BEP20: after convert,the balance increase error");
  }
  
  /** 
   * @dev Convert `amount` old PHX tokens to new PHB tokens by 1% rate. 
   *
   * Requirements
   *
   * - `amount` must be more than zero and no more than balance.
   */
  function convertPHX(uint256 amount) external{
    require(amount > 0 , "BEP20: convert amount not more than zero");
    uint256 balance = _oldPHX.balanceOf(_msgSender());
    require(balance >= amount , "BEP20: convert amount more than balance");
    
    uint256 balanceBefore = _balances[_msgSender()];
    _oldPHX.burnFrom(_msgSender(), amount);
    _mint(_msgSender(), amount.div(100).mul(10000000000));
    uint256 balanceAfter = _balances[_msgSender()];
    require(balanceAfter-balanceBefore <= amount.div(100).mul(10000000000) , "BEP20: after convert,the balance increase error");
  }
  
  /** @dev Inflation PHB tokens with _inflationRate. 
   */
  function inflation() external{
    uint256 nowTime = now;  
    require(nowTime > _lastInflationTime , "BEP20: now time is before last inflation time");
    
    uint256 time = nowTime.sub(_lastInflationTime);
    uint256 n = time.div(86400).add(1);
    uint256 day_inflation = 0;
    uint256 n_day_inflation = 0;
    uint256 _tmpInflationInitialAmount = _inflationInitialAmount;
    for(uint i = 0; i < n; i++){
        day_inflation = _tmpInflationInitialAmount.mul(_inflationRate).div(1000000000000);
        n_day_inflation = n_day_inflation.add(day_inflation);
        _tmpInflationInitialAmount = _tmpInflationInitialAmount.add(day_inflation);
    }
    _mint(_inflationAddress, n_day_inflation);
    _lastInflationTime = _lastInflationTime.add(n * 86400);
    _inflationInitialAmount=_tmpInflationInitialAmount;
  }
  
  /** @dev Set `rate` to _inflationRate. 
   *
   * Requirements
   *
   * - `rate` must be more than zero.
   */
  function setInflationRate(uint256 rate) external onlyOwner{
    require(rate > 0 , "BEP20: inflation rate not more than zero");
    _inflationRate=rate;
  }
  
  /**
   * @dev Get _inflationRate. 
   */
  function inflationRate() external view returns (uint256) {
    return _inflationRate;
  }
  
  /** @dev Set `inflationAddress` to _inflationAddress. 
   */
  function setInflationAddress(address inflationAddress) external onlyOwner{
    require(inflationAddress != address(0), "BEP20: new inflationAddress is the zero address");
    _inflationAddress=inflationAddress;
  }
  
  /**
   * @dev Get _inflationAddress. 
   */
  function inflationAddress() external view returns (address) {
    return _inflationAddress;
  }
  
  /**
   * @dev Get _lastInflationTime. 
   */
  function lastInflationTime() external view returns (uint256) {
    return _lastInflationTime;
  }
  
  
  /**
   * @dev Get _oldPHBAddress. 
   */
  function oldPHB() external view returns (address) {
    return _oldPHBAddress;
  }
  
  /**
   * @dev Get _oldPHXAddress. 
   */
  function oldPHX() external view returns (address) {
    return _oldPHXAddress;
  }
  
  /** @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
   *
   * - `to` cannot be the zero address.
   */
  function _mint(address account, uint256 amount) internal {
    require(account != address(0), "BEP20: mint to the zero address");

    _totalSupply = _totalSupply.add(amount);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(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 {
    require(account != address(0), "BEP20: burn from the zero address");

    _balances[account] = _balances[account].sub(amount, "BEP20: burn amount exceeds balance");
    _totalSupply = _totalSupply.sub(amount);
    emit Transfer(account, address(0), amount);
  }

  /**
   * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
   *
   * This is 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.
   * - `amount` must be more than zero.
   */
  function _approve(address owner, address spender, uint256 amount) internal {
    require(owner != address(0), "BEP20: approve from the zero address");
    require(spender != address(0), "BEP20: approve to the zero address");
    require(amount > 0, "BEP20: approve amount must be more than zero");

    _allowances[owner][spender] = amount;
    emit Approval(owner, spender, amount);
  }
  
   /**
   * @dev Emitted when `value` tokens are moved from one account (`from`) to
   * another (`to`) with additional data(`data`).
   */
  event Transfer(address indexed from, address indexed to, uint value, bytes data);

  /**
  * @dev transfer token to a contract address with additional data if the recipient is a contract.
  * @param to The address to transfer to.
  * @param value The amount to be transferred.
  * @param data The extra data to be passed to the receiving contract.
  */
  function transferAndCall(address to, uint value, bytes calldata data)
    external
    returns (bool)
  {
    transfer(to, value);
    emit Transfer(_msgSender(), to, value, data);
    if (_isContract(to)) {
      _contractFallback(to, value, data);
    }
    return true;
  }

  /**
  * @dev Call the onTokenTransfer function of contract(`to`).
  */
  function _contractFallback(address to, uint value, bytes memory data)
    internal
  {
    ERC677Receiver receiver = ERC677Receiver(to);
    receiver.onTokenTransfer(_msgSender(), value, data);
  }
  /** 
  * @dev Judge `addr` is constract address or not. 
  */
  function _isContract(address addr)
    internal view returns (bool)
  {
    uint length;
    assembly { length := extcodesize(addr) }
    return length > 0;
  }
}