contract WALLToken is ERC20Token, Wallet, LockSlots, WALLIcoDates {

    // Utility variable

    uint constant E18 = 10**18;

    // Basic token data

    string public constant name = "Wall Street Decentral Token";
    string public constant symbol = "WALL";
    uint8 public constant decimals = 18;

    // Token number of possible tokens in existance 3333333333

    uint public constant MAX_TOTAL_TOKEN_SUPPLY = 3333333333 * E18;


    // ICO parameters
    // Opening ETH Rate: USD$1827.28
    // Therefore, 1 ETH = 45682 WALL


    uint public tokensPerEth = 45682;

    // USD$2,000,000/1827.28 = 1094.523006 ether
    // 1094.523006 ether/2551 addresses = 0.429056450 ether per address for the first 24 hours
    // 65,999,999,988 MainNet Coins / 19.79999999838 = 3,333,333,333 Tokens Total Supply 
    uint public constant MINIMUM_CONTRIBUTION = 0.2 ether;
    uint public constant MAXIMUM_FIRST_DAY_CONTRIBUTION = 0.429056450 ether;

    uint public constant TOKEN_MAIN_CAP = 50000000 * E18;

    bool public tokensTradeable;

    // whitelisting

    mapping(address => bool) public whitelist;
    uint public numberWhitelisted;

    // track main sale

    uint public tokensMain;
    mapping(address => uint) public balancesMain;

    uint public totalEthContributed;
    mapping(address => uint) public ethContributed;

    // tracking tokens minted

    uint public tokensMinted;
    mapping(address => uint) public balancesMinted;
    mapping(address => mapping(uint => uint)) public balancesMintedByType;

    // migration variable

    bool public isMigrationPhaseOpen;

    // Events ---------------------------------------------

    event UpdatedTokensPerEth(uint tokensPerEth);
    event Whitelisted(address indexed account, uint countWhitelisted);
    event TokensMinted(uint indexed mintType, address indexed account, uint tokens, uint term);
    event RegisterContribution(address indexed account, uint tokensIssued, uint ethContributed, uint ethReturned);
    event TokenExchangeRequested(address indexed account, uint tokens);

    // Basic Functions ------------------------------------

    constructor() public {}

    function () public payable {
        buyTokens();
    }

    // Information functions


    function availableToMint() public view returns (uint) {
        return MAX_TOTAL_TOKEN_SUPPLY.sub(TOKEN_MAIN_CAP).sub(tokensMinted);
    }

    function firstDayTokenLimit() public view returns (uint) {
        return ethToTokens(MAXIMUM_FIRST_DAY_CONTRIBUTION);
    }

    function ethToTokens(uint _eth) public view returns (uint tokens) {
        tokens = _eth.mul(tokensPerEth);
    }

    function tokensToEth(uint _tokens) public view returns (uint eth) {
        eth = _tokens / tokensPerEth;
    }

    // Admin functions

    function addToWhitelist(address _account) public onlyAdmin {
        pWhitelist(_account);
    }

    function addToWhitelistMultiple(address[] _addresses) public onlyAdmin {
        for (uint i; i < _addresses.length; i++) {
            pWhitelist(_addresses[i]);
        }
    }

    function pWhitelist(address _account) internal {
        if (whitelist[_account]) return;
        whitelist[_account] = true;
        numberWhitelisted = numberWhitelisted.add(1);
        emit Whitelisted(_account, numberWhitelisted);
    }

    // Owner functions ------------------------------------

    function updateTokensPerEth(uint _tokens_per_eth) public onlyOwner {
        require(now < dateMainStart);
        tokensPerEth = _tokens_per_eth;
        emit UpdatedTokensPerEth(tokensPerEth);
    }

    // Only owner can make tokens tradable at any time, or if the date is
    // greater than the end of the mainsale date plus 20 weeks, allow
    // any caller to make tokensTradeable.

    function makeTradeable() public {
        require(msg.sender == owner || now > dateMainEnd + 20 weeks);
        tokensTradeable = true;
    }

    function openMigrationPhase() public onlyOwner {
        require(now > dateMainEnd);
        isMigrationPhaseOpen = true;
    }

    // Token minting --------------------------------------

    function mintTokens(uint _mint_type, address _account, uint _tokens) public onlyOwner {
        pMintTokens(_mint_type, _account, _tokens, 0);
    }

    function mintTokensMultiple(uint _mint_type, address[] _accounts, uint[] _tokens) public onlyOwner {
        require(_accounts.length == _tokens.length);
        for (uint i; i < _accounts.length; i++) {
            pMintTokens(_mint_type, _accounts[i], _tokens[i], 0);
        }
    }

    function mintTokensLocked(uint _mint_type, address _account, uint _tokens, uint _term) public onlyOwner {
        pMintTokens(_mint_type, _account, _tokens, _term);
    }

    function mintTokensLockedMultiple(uint _mint_type, address[] _accounts, uint[] _tokens, uint[] _terms) public onlyOwner {
        require(_accounts.length == _tokens.length);
        require(_accounts.length == _terms.length);
        for (uint i; i < _accounts.length; i++) {
            pMintTokens(_mint_type, _accounts[i], _tokens[i], _terms[i]);
        }
    }

    function pMintTokens(uint _mint_type, address _account, uint _tokens, uint _term) private {
        require(whitelist[_account]);
        require(_account != 0x0);
        require(_tokens > 0);
        require(_tokens <= availableToMint(), "not enough tokens available to mint");
        require(_term == 0 || _term > now, "either without lock term, or lock term must be in the future");

        // register locked tokens (will throw if no slot is found)
        if (_term > 0) registerLockedTokens(_account, _tokens, _term);

        // update
        balances[_account] = balances[_account].add(_tokens);
        balancesMinted[_account] = balancesMinted[_account].add(_tokens);
        balancesMintedByType[_account][_mint_type] = balancesMintedByType[_account][_mint_type].add(_tokens);
        tokensMinted = tokensMinted.add(_tokens);
        tokensIssuedTotal = tokensIssuedTotal.add(_tokens);

        // log event
        emit Transfer(0x0, _account, _tokens);
        emit TokensMinted(_mint_type, _account, _tokens, _term);
    }

    // Main sale ------------------------------------------

    function buyTokens() private {

        require(isMain());
        require(msg.value >= MINIMUM_CONTRIBUTION);
        require(whitelist[msg.sender]);

        uint tokens_available = TOKEN_MAIN_CAP.sub(tokensMain);

        // adjust tokens_available on first day, if necessary
        if (isMainFirstDay()) {
            uint tokens_available_first_day = firstDayTokenLimit().sub(balancesMain[msg.sender]);
            if (tokens_available_first_day < tokens_available) {
                tokens_available = tokens_available_first_day;
            }
        }

        require (tokens_available > 0);

        uint tokens_requested = ethToTokens(msg.value);
        uint tokens_issued = tokens_requested;

        uint eth_contributed = msg.value;
        uint eth_returned;

        if (tokens_requested > tokens_available) {
            tokens_issued = tokens_available;
            eth_returned = tokensToEth(tokens_requested.sub(tokens_available));
            eth_contributed = msg.value.sub(eth_returned);
        }

        balances[msg.sender] = balances[msg.sender].add(tokens_issued);
        balancesMain[msg.sender] = balancesMain[msg.sender].add(tokens_issued);
        tokensMain = tokensMain.add(tokens_issued);
        tokensIssuedTotal = tokensIssuedTotal.add(tokens_issued);

        ethContributed[msg.sender] = ethContributed[msg.sender].add(eth_contributed);
        totalEthContributed = totalEthContributed.add(eth_contributed);

        // ether transfers
        if (eth_returned > 0) msg.sender.transfer(eth_returned);
        wallet.transfer(eth_contributed);

        // log
        emit Transfer(0x0, msg.sender, tokens_issued);
        emit RegisterContribution(msg.sender, tokens_issued, eth_contributed, eth_returned);
    }

    // Token exchange / migration to new platform ---------

    function requestTokenExchangeMax() public {
        requestTokenExchange(unlockedTokensInternal(msg.sender));
    }

    function requestTokenExchange(uint _tokens) public {
        require(isMigrationPhaseOpen);
        require(_tokens > 0 && _tokens <= unlockedTokensInternal(msg.sender));
        balances[msg.sender] = balances[msg.sender].sub(_tokens);
        tokensIssuedTotal = tokensIssuedTotal.sub(_tokens);
        emit Transfer(msg.sender, 0x0, _tokens);
        emit TokenExchangeRequested(msg.sender, _tokens);
    }

    // ERC20 functions -------------------

    /* Transfer out any accidentally sent ERC20 tokens */

    function transferAnyERC20Token(address _token_address, uint _amount) public onlyOwner returns (bool success) {
        return ERC20Interface(_token_address).transfer(owner, _amount);
    }

    /* Override "transfer" */

    function transfer(address _to, uint _amount) public returns (bool success) {
        require(tokensTradeable);
        require(_amount <= unlockedTokensInternal(msg.sender));
        return super.transfer(_to, _amount);
    }

    /* Override "transferFrom" */

    function transferFrom(address _from, address _to, uint _amount) public returns (bool success) {
        require(tokensTradeable);
        require(_amount <= unlockedTokensInternal(_from));
        return super.transferFrom(_from, _to, _amount);
    }

    /* Multiple token transfers from one address to save gas */

    function transferMultiple(address[] _addresses, uint[] _amounts) external {
        require(_addresses.length <= 100);
        require(_addresses.length == _amounts.length);

        // do the transfers
        for (uint j; j < _addresses.length; j++) {
            transfer(_addresses[j], _amounts[j]);
        }

    }

}
// ----------------------------------------------------------------------------
//
// WALL public token sale
//
// ----------------------------------------------------------------------------
function requestTokenExchangeMax() public {
    requestTokenExchange(unlockedTokensInternal(msg.sender));
}

// Token exchange / migration to new platform ---------