pragma solidity >=0.4.22 <0.6.0;

contract owned {
    address public owner;
    
    constructor() public {
        owner = msg.sender;
    }
    
    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

}

interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes calldata _extraData) external; }

contract ERC20_token {
    // Public variables of the token
    string public name;
    string public symbol;
    uint8 public decimals = 0;
    // 18 decimals is the strongly suggested default, avoid changing it
    uint256 public totalSupply = 10000000000;
    
    // This creates an array with all balances
    mapping (address => uint256) public balanceOf;
    mapping (address => mapping (address => uint256)) public allowance;
    
    // This generates a public event on the blockchain that will notify clients
    event Transfer(address indexed from, address indexed to, uint256 value);
    
    // This generates a public event on the blockchain that will notify clients
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
    
    // This notifies clients about the amount burnt
    event Burn(address indexed from, uint256 value);

    /**
    * Constructor function
    *
    * Initializes contract with initial supply tokens to the creator of the contract
    */
    constructor(
        uint256 initialSupply,
        string memory tokenName,
        string memory tokenSymbol
    ) public {
        totalSupply = initialSupply * 10 ** uint256(decimals); // Update total supply with the decimal amount
        name = tokenName; // Set the name for display purposes
        symbol = tokenSymbol; // Set the symbol for display purposes
    }
    
    /**
    * Internal transfer, only can be called by this contract
    */
    function _transfer(address _from, address _to, uint _value) internal {
        // Prevent transfer to 0x0 address. Use burn() instead
        require(_to != address(0x0));
        // Check if the sender has enough
        require(balanceOf[_from] >= _value);
        // Check for overflows
        require(balanceOf[_to] + _value > balanceOf[_to]);
        // Save this for an assertion in the future
        uint previousBalances = balanceOf[_from] + balanceOf[_to];
        // Subtract from the sender
        balanceOf[_from] -= _value;
        // Add the same to the recipient
        balanceOf[_to] += _value;
        emit Transfer(_from, _to, _value);
        // Asserts are used to use static analysis to find bugs in your code. They should never fail
        assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
    }
    
    /**
    * Transfer tokens
    *
    * Send `_value` tokens to `_to` from your account
    *
    * @param _to The address of the recipient
    * @param _value the amount to send
    */
    function transfer(address _to, uint256 _value) public returns (bool success) {
        _transfer(msg.sender, _to, _value);
        return true;
    }
    
    /**
    * Transfer tokens from other address
    *
    * Send `_value` tokens to `_to` in behalf of `_from`
    *
    * @param _from The address of the sender
    * @param _to The address of the recipient
    * @param _value the amount to send
    */
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_value <= allowance[_from][msg.sender]); // Check allowance
        allowance[_from][msg.sender] -= _value;
        _transfer(_from, _to, _value);
        return true;
    }
    
    /**
    * Set allowance for other address
    *
    * Allows `_spender` to spend no more than `_value` tokens in your behalf
    *
    * @param _spender The address authorized to spend
    * @param _value the max amount they can spend
    */
    function approve(address _spender, uint256 _value) public
    returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }
    
    /**
    * Set allowance for other address and notify
    *
    * Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it
    *
    * @param _spender The address authorized to spend
    * @param _value the max amount they can spend
    * @param _extraData some extra information to send to the approved contract
    */
    function approveAndCall(address _spender, uint256 _value, bytes memory _extraData)
    public
    returns (bool success) {
        tokenRecipient spender = tokenRecipient(_spender);
        if (approve(_spender, _value)) {
            spender.receiveApproval(msg.sender, _value, address(this), _extraData);
            return true;
        }
    }
    
    /**
    * Destroy tokens
    *
    * Remove `_value` tokens from the system irreversibly
    *
    * @param _value the amount of money to burn
    */
    function burn(uint256 _value) public returns (bool success) {
        require(balanceOf[msg.sender] >= _value); // Check if the sender has enough
        balanceOf[msg.sender] -= _value; // Subtract from the sender
        totalSupply -= _value; // Updates totalSupply
        emit Burn(msg.sender, _value);
        return true;
    }
    
    /**
    * Destroy tokens from other account
    *
    * Remove `_value` tokens from the system irreversibly on behalf of `_from`.
    *
    * @param _from the address of the sender
    * @param _value the amount of money to burn
    */
    function burnFrom(address _from, uint256 _value) public returns (bool success) {
        require(balanceOf[_from] >= _value); // Check if the targeted balance is enough
        require(_value <= allowance[_from][msg.sender]); // Check allowance
        balanceOf[_from] -= _value; // Subtract from the targeted balance
        allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance
        totalSupply -= _value; // Update totalSupply
        emit Burn(_from, _value);
        return true;
    }
}

/******************************************/
/* LGX TOKEN STARTS HERE */
/******************************************/

contract LGX is owned, ERC20_token {

    uint256 public sellPrice;
    uint256 public buyPrice;
    address public AddressOfTeamTokenVault;
    address public AddressOfMarketingTokenVault;
    address public AddressOfAirdropTokenVault;
    address public AddressOfBonusTokenVault;
    address public AddressOfSellTokenVault;
    
    mapping (address => bool) public frozenAccount;
    mapping (address => uint256) public frozenTime;
    
    /* This generates a public event on the blockchain that will notify clients */
    event FrozenFunds(address target, bool frozen);

    /* Initializes contract with initial supply tokens to the creator of the contract */
    constructor(
        uint256 initialSupply,
        string memory tokenName,
        string memory tokenSymbol,
        address teamTokenVault,
        address marketingTokenVault,
        address airdropTokenVault,
        address bonusTokenVault,
        address sellTokenVault
    ) ERC20_token(initialSupply, tokenName, tokenSymbol) public {
        // This is for LiongateX team. 15% of totalSupply
        AddressOfTeamTokenVault = teamTokenVault;
        balanceOf[teamTokenVault] = totalSupply / 100 * 15;
        
        // This is for marketing. 10% of totalSupply
        AddressOfMarketingTokenVault = marketingTokenVault;
        balanceOf[marketingTokenVault] = totalSupply / 10;
        
        // This is for airdrop. 10% of totalSupply
        AddressOfAirdropTokenVault = airdropTokenVault;
        balanceOf[airdropTokenVault] = totalSupply / 10;
        
        // This is for bonus. 10% of totalSupply
        AddressOfBonusTokenVault = bonusTokenVault;
        balanceOf[bonusTokenVault] = totalSupply / 10;
        
        // This is for selling. 55% of totalSupply
        AddressOfSellTokenVault = sellTokenVault;
        balanceOf[sellTokenVault] = totalSupply / 100 * 55;
    }
    
    /* Internal transfer, only can be called by this contract */
    function _transfer(address _from, address _to, uint _value) internal {
        require (_to != address(0x0)); // Prevent transfer to 0x0 address. Use burn() instead
        require (balanceOf[_from] >= _value); // Check if the sender has enough
        require (balanceOf[_to] + _value >= balanceOf[_to]); // Check for overflows
        require(!frozenAccount[_from]); // Check if sender is frozen
        require(!frozenAccount[_to]); // Check if recipient is frozen
        balanceOf[_from] -= _value; // Subtract from the sender
        balanceOf[_to] += _value; // Add the same to the recipient
        emit Transfer(_from, _to, _value);
    }
    
    /// @notice Create `mintedAmount` tokens and send it to `target`
    /// @param target Address to receive the tokens
    /// @param mintedAmount the amount of tokens it will receive
    function mintToken(address target, uint256 mintedAmount) onlyOwner public {
        balanceOf[target] += mintedAmount;
        totalSupply += mintedAmount;
        emit Transfer(address(0), address(this), mintedAmount);
        emit Transfer(address(this), target, mintedAmount);
    }
    
    /// @notice Prevent `target` from sending & receiving tokens
    /// @param target Address to be frozen
    function freezeAccount(address target) onlyOwner public {
        frozenAccount[target] = true;
        frozenTime[target] = now;
        emit FrozenFunds(target, true);
    }
    
    /// @notice Allow `target` from sending & receiving tokens
    /// @param target Address to be frozen
    function meltAccount(address target) onlyOwner public {
        require(now > frozenTime[target] + 182 days);
        frozenAccount[target] = false;
        emit FrozenFunds(target, false);
    }
    
    function LockTeamVault() onlyOwner public {
        freezeAccount(AddressOfTeamTokenVault);
    }
    
    function UnlockTeamVault() onlyOwner public {
        meltAccount(AddressOfTeamTokenVault);
    }
    
    /// @notice Allow users to buy tokens for `newBuyPrice` eth and sell tokens for `newSellPrice` eth
    /// @param newSellPrice Price the users can sell to the contract
    /// @param newBuyPrice Price users can buy from the contract
    function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner public {
        sellPrice = newSellPrice;
        buyPrice = newBuyPrice;
    }
    
    /// @notice Buy tokens from contract by sending ether
    function buy() payable public {
        uint amount = msg.value / buyPrice; // calculates the amount
        _transfer(address(this), msg.sender, amount); // makes the transfers
    }
    
    /// @notice Sell `amount` tokens to contract
    /// @param amount amount of tokens to be sold
    function sell(uint256 amount) public {
        address myAddress = address(this);
        require(myAddress.balance >= amount * sellPrice); // checks if the contract has enough ether to buy
        _transfer(msg.sender, address(this), amount); // makes the transfers
        msg.sender.transfer(amount * sellPrice); // sends ether to the seller. It's important to do this last to avoid recursion attacks
    }
}