pragma solidity ^0.4.23;


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
    function totalSupply() public view returns (uint256);

    function balanceOf(address who) public view returns (uint256);

    function transfer(address to, uint256 value) public returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
}


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
    function allowance(address owner, address spender)
    public view returns (uint256);

    function transferFrom(address from, address to, uint256 value)
    public returns (bool);

    function approve(address spender, uint256 value) public returns (bool);

    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        c = a * b;
        assert(c / a == b);
        return c;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        // uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return a / b;
    }

    /**
    * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
        c = a + b;
        assert(c >= a);
        return c;
    }
}


/**
 * @title Crowdsale
 * @dev Crowdsale is a base contract for managing a token crowdsale,
 * allowing investors to purchase tokens with ether. This contract implements
 * such functionality in its most fundamental form and can be extended to provide additional
 * functionality and/or custom behavior.
 * The external interface represents the basic interface for purchasing tokens, and conform
 * the base architecture for crowdsales. They are *not* intended to be modified / overriden.
 * The internal interface conforms the extensible and modifiable surface of crowdsales. Override
 * the methods to add functionality. Consider using 'super' where appropiate to concatenate
 * behavior.
 */
contract Crowdsale {
    using SafeMath for uint256;

    // The token being sold
    ERC20 public token;

    // Address where funds are collected
    address public wallet;

    // How many token units a buyer gets per wei.
    // The rate is the conversion between wei and the smallest and indivisible token unit.
    // So, if you are using a rate of 1 with a DetailedERC20 token with 3 decimals called TOK
    // 1 wei will give you 1 unit, or 0.001 TOK.
    uint256 public rate;

    // Amount of wei raised
    uint256 public weiRaised;

    /**
     * Event for token purchase logging
     * @param purchaser who paid for the tokens
     * @param beneficiary who got the tokens
     * @param value weis paid for purchase
     * @param amount amount of tokens purchased
     */
    event TokenPurchase(
        address indexed purchaser,
        address indexed beneficiary,
        uint256 value,
        uint256 amount
    );

    /**
     * @param _rate Number of token units a buyer gets per wei
     * @param _wallet Address where collected funds will be forwarded to
     * @param _token Address of the token being sold
     */
    constructor(uint256 _rate, address _wallet, ERC20 _token) public {
        require(_rate > 0);
        require(_wallet != address(0));
        require(_token != address(0));

        rate = _rate;
        wallet = _wallet;
        token = _token;
    }

    // -----------------------------------------
    // Crowdsale external interface
    // -----------------------------------------

    /**
     * @dev fallback function ***DO NOT OVERRIDE***
     */
    function() external payable {
        buyTokens(msg.sender);
    }

    /**
     * @dev low level token purchase ***DO NOT OVERRIDE***
     * @param _beneficiary Address performing the token purchase
     */
    function buyTokens(address _beneficiary) public payable {

        uint256 weiAmount = msg.value;
        _preValidatePurchase(_beneficiary, weiAmount);

        // calculate token amount to be created
        uint256 tokens = _getTokenAmount(weiAmount);

        // update state
        weiRaised = weiRaised.add(weiAmount);

        _processPurchase(_beneficiary, tokens);
        emit TokenPurchase(
            msg.sender,
            _beneficiary,
            weiAmount,
            tokens
        );

        _processBonusStateSave(_beneficiary, weiAmount);

        _forwardFunds();
    }

    // -----------------------------------------
    // Internal interface (extensible)
    // -----------------------------------------

    /**
     * @dev Validation of an incoming purchase. Use require statements to revert state when conditions are not met. Use super to concatenate validations.
     * @param _beneficiary Address performing the token purchase
     * @param _weiAmount Value in wei involved in the purchase
     */
    function _preValidatePurchase(
        address _beneficiary,
        uint256 _weiAmount
    )
    internal
    {
        require(_beneficiary != address(0));
        require(_weiAmount != 0);
    }

    /**
     * @dev Source of tokens. Override this method to modify the way in which the crowdsale ultimately gets and sends its tokens.
     * @param _beneficiary Address performing the token purchase
     * @param _tokenAmount Number of tokens to be emitted
     */
    function _deliverTokens(
        address _beneficiary,
        uint256 _tokenAmount
    )
    internal
    {
        token.transfer(_beneficiary, _tokenAmount);
    }

    /**
     * @dev Executed when a purchase has been validated and is ready to be executed. Not necessarily emits/sends tokens.
     * @param _beneficiary Address receiving the tokens
     * @param _tokenAmount Number of tokens to be purchased
     */
    function _processPurchase(
        address _beneficiary,
        uint256 _tokenAmount
    )
    internal
    {
        _deliverTokens(_beneficiary, _tokenAmount);
    }

    /**
     * @dev Override to extend the way in which ether is converted to tokens.
     * @param _weiAmount Value in wei to be converted into tokens
     * @return Number of tokens that can be purchased with the specified _weiAmount
     */
    function _getTokenAmount(uint256 _weiAmount)
    internal view returns (uint256)
    {
        return _weiAmount.mul(rate);
    }

    function _processBonusStateSave(
        address _beneficiary,
        uint256 _weiAmount
    )
    internal
    {
    }

    /**
     * @dev Determines how ETH is stored/forwarded on purchases.
     */
    function _forwardFunds() internal {
        wallet.transfer(msg.value);
    }
}


/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure.
 * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    function safeTransfer(ERC20Basic token, address to, uint256 value) internal {
        require(token.transfer(to, value));
    }

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 value
    )
    internal
    {
        require(token.transferFrom(from, to, value));
    }

    function safeApprove(ERC20 token, address spender, uint256 value) internal {
        require(token.approve(spender, value));
    }
}


/**
 * @title AllowanceCrowdsale
 * @dev Extension of Crowdsale where tokens are held by a wallet, which approves an allowance to the crowdsale.
 */
contract AllowanceCrowdsale is Crowdsale {
    using SafeMath for uint256;
    using SafeERC20 for ERC20;

    address public tokenWallet;

    /**
     * @dev Constructor, takes token wallet address.
     * @param _tokenWallet Address holding the tokens, which has approved allowance to the crowdsale
     */
    constructor(address _tokenWallet) public {
        require(_tokenWallet != address(0));
        tokenWallet = _tokenWallet;
    }

    /**
     * @dev Checks the amount of tokens left in the allowance.
     * @return Amount of tokens left in the allowance
     */
    function remainingTokens() public view returns (uint256) {
        return token.allowance(tokenWallet, this);
    }

    /**
     * @dev Overrides parent behavior by transferring tokens from wallet.
     * @param _beneficiary Token purchaser
     * @param _tokenAmount Amount of tokens purchased
     */
    function _deliverTokens(
        address _beneficiary,
        uint256 _tokenAmount
    )
    internal
    {
        token.safeTransferFrom(tokenWallet, _beneficiary, _tokenAmount);
    }
}


/**
 * @title TimedCrowdsale
 * @dev Crowdsale accepting contributions only within a time frame.
 */
contract TimedCrowdsale is Crowdsale {
    using SafeMath for uint256;

    uint256 public openingTime;

    /**
     * @dev Reverts if not in crowdsale time range.
     */
    modifier onlyWhileOpen {
        // solium-disable-next-line security/no-block-members
        require(isOpen());
        _;
    }

    /**
     * @dev Constructor, takes crowdsale opening and closing times.
     * @param _openingTime Crowdsale opening time
     */
    constructor(uint256 _openingTime) public {
        // solium-disable-next-line security/no-block-members
        require(_openingTime >= block.timestamp);

        openingTime = _openingTime;
    }

    /**
     * @return true if the crowdsale is open, false otherwise.
     */
    function isOpen() public view returns (bool) {
        // solium-disable-next-line security/no-block-members
        return block.timestamp >= openingTime;
    }

    /**
     * @dev Extend parent behavior requiring to be within contributing period
     * @param _beneficiary Token purchaser
     * @param _weiAmount Amount of wei contributed
     */
    function _preValidatePurchase(
        address _beneficiary,
        uint256 _weiAmount
    )
    internal
    onlyWhileOpen
    {
        super._preValidatePurchase(_beneficiary, _weiAmount);
    }

}


/**
 * @title CappedCrowdsale
 * @dev Crowdsale with a limit for total contributions.
 */
contract CappedCrowdsale is Crowdsale {
    using SafeMath for uint256;

    uint256 public cap;

    /**
     * @dev Constructor, takes maximum amount of wei accepted in the crowdsale.
     * @param _cap Max amount of wei to be contributed
     */
    constructor(uint256 _cap) public {
        require(_cap > 0);
        cap = _cap;
    }

    /**
     * @dev Checks whether the cap has been reached.
     * @return Whether the cap was reached
     */
    function capReached() public view returns (bool) {
        return weiRaised >= cap;
    }

    /**
     * @dev Extend parent behavior requiring purchase to respect the funding cap.
     * @param _beneficiary Token purchaser
     * @param _weiAmount Amount of wei contributed
     */
    function _preValidatePurchase(
        address _beneficiary,
        uint256 _weiAmount
    )
    internal
    {
        super._preValidatePurchase(_beneficiary, _weiAmount);
        require(weiRaised.add(_weiAmount) <= cap);
    }
}


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address public owner;


    event OwnershipRenounced(address indexed previousOwner);
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );


    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor() public {
        owner = msg.sender;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    /**
     * @dev Allows the current owner to relinquish control of the contract.
     * @notice Renouncing to ownership will leave the contract without an owner.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipRenounced(owner);
        owner = address(0);
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param _newOwner The address to transfer ownership to.
     */
    function transferOwnership(address _newOwner) public onlyOwner {
        _transferOwnership(_newOwner);
    }

    /**
     * @dev Transfers control of the contract to a newOwner.
     * @param _newOwner The address to transfer ownership to.
     */
    function _transferOwnership(address _newOwner) internal {
        require(_newOwner != address(0));
        emit OwnershipTransferred(owner, _newOwner);
        owner = _newOwner;
    }
}


contract TecoIco is Crowdsale, AllowanceCrowdsale, TimedCrowdsale, CappedCrowdsale, Ownable {
    using SafeMath for uint256;

    uint256 public bonusPercent;

    mapping(address => uint256) bonuses;

    constructor(uint256 _rate, address _wallet, ERC20 _token, address _tokenWallet, uint256 _openingTime, uint256 _cap)
    Crowdsale(_rate, _wallet, _token)
    AllowanceCrowdsale(_tokenWallet)
    TimedCrowdsale(_openingTime)
    CappedCrowdsale(_cap)
    public
    {
        require(_rate > 0);
        require(_wallet != address(0));
        require(_token != address(0));

        rate = _rate;
        wallet = _wallet;
        token = _token;
    }

    function setRate(uint256 _rate)
    public
    onlyOwner
    {
        rate = _rate;
    }

    function setBonusPercent(uint256 _bonusPercent)
    public
    onlyOwner
    {
        bonusPercent = _bonusPercent;
    }

    function getBonusTokenAmount(uint256 _weiAmount)
    public
    view
    returns (uint256)
    {
        if (bonusPercent > 0) {
            return _weiAmount.mul(rate).mul(bonusPercent).div(100);
        }
        return 0;
    }

    function _getTokenAmount(uint256 _weiAmount)
    internal
    view
    returns (uint256)
    {
        if (bonusPercent > 0) {
            return _weiAmount.mul(rate).mul(100 + bonusPercent).div(100);
        }
        return _weiAmount.mul(rate);
    }

    function _processBonusStateSave(
        address _beneficiary,
        uint256 _weiAmount
    )
    internal
    {
        bonuses[_beneficiary] = bonuses[_beneficiary].add(getBonusTokenAmount(_weiAmount));
        super._processBonusStateSave(_beneficiary, _weiAmount);
    }

    function bonusOf(address _owner) public view returns (uint256) {
        return bonuses[_owner];
    }
}