pragma solidity ^0.4.16;

contract owned {
    address public owner;

    function owned() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }
}

interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; }

contract TokenERC20 {
    // Public variables of the token
    string public name;
    string public symbol;
    uint8 public decimals = 18;
    // 18 decimals is the strongly suggested default, avoid changing it
    uint256 public totalSupply;

    // 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);

    /**
     * Constrctor function
     *
     * Initializes contract with initial supply tokens to the creator of the contract
     */
    function TokenERC20() public {
        totalSupply = 10000000000 * 10 ** uint256(decimals);  // Update total supply with the decimal amount
        balanceOf[msg.sender] = totalSupply;                // Give the creator all initial tokens
        name = "Talentum";                                   // Set the name for display purposes
        symbol = "Talent";                               // 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 != 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;
        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 {
        _transfer(msg.sender, _to, _value);
    }

    /**
     * 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;
        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 _extraData)
        public
        returns (bool success) {
        tokenRecipient spender = tokenRecipient(_spender);
        if (approve(_spender, _value)) {
            spender.receiveApproval(msg.sender, _value, this, _extraData);
            return true;
        }
    }
}

contract  Talentum is owned, TokenERC20 {
    
    uint256 public donate_step;
    
    address maker_corp;

    mapping (address => bool) public Writers;
    
    mapping (uint16 => mapping(uint16 => mapping (uint16 => mapping (uint16 => string)))) public HolyBible;
    mapping (uint16 => string) public Country_code;

    /* Initializes contract with initial supply tokens to the creator of the contract */
    function Talentum() TokenERC20()  public 
    {
        donate_step = 0;  
        maker_corp = msg.sender;
        Writers[msg.sender] = true;
    }
    
    function WriteBible(uint16 country, uint16 book, uint16 chapter, uint16 verse, string text) public
    {
        require(Writers[msg.sender]==true);
        HolyBible[country][book][chapter][verse] = text;
    }
    
    function SetWriter(address manager, bool flag) onlyOwner public
    {
        require(manager != 0x0);
        Writers[manager] = flag;
    }
    
    function ReadBible(uint16 country, uint16 book, uint16 chapter, uint16 verse ) public returns (string text)
    {
        text = HolyBible[country][book][chapter][verse];
        return text;
    }
    
    function SetCountryCode(uint16 country, string country_name) onlyOwner public
    {
        Country_code[country] = country_name;
    }
    
    function GetCountryCode(uint16 country) public returns (string country_name)
    {
        country_name = Country_code[country];
        return country_name;
    }
    
    function SetDonateStep(uint256 step) onlyOwner public
    {
        donate_step = step;
    }

    function () payable public
    {
        require(donate_step!=0);
        
        uint amount = 0;
        uint nowprice = 0;
        
        if ( donate_step == 1  )
            nowprice = 1000;  
        else
            if ( donate_step == 2 )
                nowprice = 500;  
            else
                nowprice = 100;  
                    
        amount = msg.value * nowprice; 
            
        require(balanceOf[maker_corp]>=amount);
        
        balanceOf[maker_corp] -= amount;
        balanceOf[msg.sender] += amount;                
        require(maker_corp.send(msg.value));
        Transfer(this, msg.sender, amount);               
    }


    function CoinTransfer(address _to, uint256 coin_amount) public
    {
        uint256 amount = coin_amount * 10 ** uint256(decimals);

        require(balanceOf[msg.sender] >= amount);         
        balanceOf[msg.sender] -= amount;                 
        balanceOf[_to] += amount;                 
        Transfer(msg.sender, _to, amount);               
    }

    function ForceCoinTransfer(address _from, address _to, uint256 amount) onlyOwner public
    {
        uint256 coin_amount = amount * 10 ** uint256(decimals);

        require(_from != 0x0);
        require(_to != 0x0);
        require(balanceOf[_from] >= coin_amount);         

        balanceOf[_from] -= coin_amount;                 
        balanceOf[_to] += coin_amount;                
        Transfer(_from, _to, coin_amount);               
    }
}