pragma solidity ^0.4.8;

// ----------------------------------------------------------------------------------------------
// Sample fixed supply token contract
// Enjoy. (c) BokkyPooBah 2017. The MIT Licence.
// ----------------------------------------------------------------------------------------------

// ERC Token Standard #20 Interface
// https://github.com/ethereum/EIPs/issues/20
contract ERC20Interface {
   // Get the total token supply
   function totalSupply() constant returns (uint256 totalSupply);

   // Get the account balance of another account with address _owner
   function balanceOf(address _owner) constant returns (uint256 balance);

   // Send _value amount of tokens to address _to
   function transfer(address _to, uint256 _value) returns (bool success);

   // Send _value amount of tokens from address _from to address _to
   function transferFrom(address _from, address _to, uint256 _value) returns (bool success);

   // Allow _spender to withdraw from your account, multiple times, up to the _value amount.
   // If this function is called again it overwrites the current allowance with _value.
   // this function is required for some DEX functionality
   function approve(address _spender, uint256 _value) returns (bool success);

   // Returns the amount which _spender is still allowed to withdraw from _owner
   function allowance(address _owner, address _spender) constant returns (uint256 remaining);

   // Triggered when tokens are transferred.
   event Transfer(address indexed _from, address indexed _to, uint256 _value);

   // Triggered whenever approve(address _spender, uint256 _value) is called.
   event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}

contract SudjuKoin is ERC20Interface {
   string public constant symbol = "SJK";
   string public constant name = "SudjuKoin";
   uint8 public constant decimals = 2;
   uint256 _totalSupply = 1000000;

   // Owner of this contract
   address public owner;

   // Balances for each account
   mapping(address => uint256) balances;

   // Owner of account approves the transfer of an amount to another account
   mapping(address => mapping (address => uint256)) allowed;


   // Constructor
   function SudjuKoin() {
     // TODO: must be owner = msg.sender
       owner = msg.sender;
       balances[owner] = _totalSupply;
   }

   function totalSupply() constant returns (uint256 totalSupply) {
       totalSupply = _totalSupply;
   }

   // What is the balance of a particular account?
   function balanceOf(address _owner) constant returns (uint256 balance) {
       return balances[_owner];
   }

   // Transfer the balance from owner's account to another account
   function transfer(address _to, uint256 _amount) returns (bool success) {
       if (balances[msg.sender] >= _amount
           && _amount > 0
           && balances[_to] + _amount > balances[_to]) {
           balances[msg.sender] -= _amount;
           balances[_to] += _amount;
           Transfer(msg.sender, _to, _amount);
           return true;
       } else {
           return false;
       }
   }

   // Send _value amount of tokens from address _from to address _to
   // The transferFrom method is used for a withdraw workflow, allowing contracts to send
   // tokens on your behalf, for example to "deposit" to a contract address and/or to charge
   // fees in sub-currencies; the command should fail unless the _from account has
   // deliberately authorized the sender of the message via some mechanism; we propose
   // these standardized APIs for approval:
   function transferFrom(
       address _from,
       address _to,
       uint256 _amount
   ) returns (bool success) {
       if (balances[_from] >= _amount
           && allowed[_from][msg.sender] >= _amount
           && _amount > 0
           && balances[_to] + _amount > balances[_to]) {
           balances[_from] -= _amount;
           allowed[_from][msg.sender] -= _amount;
           balances[_to] += _amount;
           Transfer(_from, _to, _amount);
           return true;
       } else {
           return false;
       }
   }

   // Allow _spender to withdraw from your account, multiple times, up to the _value amount.
   // If this function is called again it overwrites the current allowance with _value.
   function approve(address _spender, uint256 _amount) returns (bool success) {
       allowed[msg.sender][_spender] = _amount;
       Approval(msg.sender, _spender, _amount);
       return true;
   }

   function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
       return allowed[_owner][_spender];
   }
}