SimpleAssets.hpp

/*
 * @file
 * @author  (C) 2021 by CryptoLions [ https://CryptoLions.io ]
 * @version 1.6.0
 *
 * @section LICENSE
 *
 * This program is under GNU LESSER GENERAL PUBLIC LICENSE.
 * Version 2.1, February 1999.
 * The licenses for most software are designed to take away your
 * freedom to share and change it.  By contrast, the GNU General Public
 * Licenses are intended to guarantee your freedom to share and change
 * free software--to make sure the software is free for all its users.
 * GNU LESSER GENERAL PUBLIC LICENSE for more details at
 * https://github.com/CryptoLions/SimpleAssets/blob/master/LICENSE
 *
 * @section DESCRIPTION
 * SimpleAssets (Digital Assets)
 *
 * A simple standard for digital assets (ie. Fungible and Non-Fungible Tokens - NFTs) for EOSIO blockchains
 *    WebSite:        https://simpleassets.io
 *    GitHub:         https://github.com/CryptoLions/SimpleAssets
 *    Presentation:   https://medium.com/@cryptolions/introducing-simple-assets-b4e17caafaa4
 *    Event Receiver: https://github.com/CryptoLions/SimpleAssets-EventReceiverExample
 */
#pragma once

#include <eosio/eosio.hpp>
#include <eosio/asset.hpp>
#include <eosio/singleton.hpp>
#include <eosio/transaction.hpp>

using namespace eosio;
using namespace std;

CONTRACT SimpleAssets : public contract{
	public:
		using contract::contract;

		/*
		* Update version.
		*
		* This action updates the version string of this SimpleAssets deployment for 3rd party wallets,
                * marketplaces, etc.
		*
		* @param version is version number of SimpleAssetst deployment.
		* @return no return value.
		*/
		ACTION updatever( string version );
		using updatever_action = action_wrapper< "updatever"_n, &SimpleAssets::updatever >;

		/*
		* New Author registration.
		*
		* This action registers a new author account. It is not mandatory.  The information posted helps third party 
		* asset explorers, wallets, and marketplaces better interact with an author's assets.
		* 
		* See README.md for examples.
		*
		* @param author     is author's account which will create assets.
		*
		* @param dappinfo   is stringified JSON. Recommended fields: 
		* 	name	 		- name of the application
		* 	company 		- name of the company
		* 	logo 			- url to image 
		* 	url 			- url to the game's websites
		* 	info			- short description of application
		* 	defaultfee 		- 100x the % fee you'd like to collect from marketplaces.  (for 2%, 200)
		*
		* @param fieldtypes is for correctly displaying a digital asset.  It is a stringified JSON with key:value pairs, 
		* where key is the field name from mdata or idata and value indicates recommended way of displaying the field. 
		*
		*
		* Recommended values for state:
		*
		* 	txt			- text (default)
		*	number			- number (will display as text)
		*	double			- a double (mathematical data dype - will display as text)
		*	timestamp		- unix timestamp in seconds
		* 	hide			- do not show
		* 	url				- show as clickable URL - format should be [urltext](urllink)
		*
		* 	img				- link to img file
		*
		* 	imgb/<mime type suffix>		- image as string in base64 format Example: "imgb/gif"
		*
		* 	video/<mime type suffix>	- link to a video file. Example:  "video/mp4"
		*	audio/<mime type suffix> 	- link to an audio file. Example:  "audio/mp3"
		*
		* 	videob/<mime type suffix> 	- video in the NFT data base64 Example:	"videob/mp4"
		*	audiob/<mime type suffix>	- audio in the NFT data base64 Example:	"audiob/mp4"
		*
		*	json 			- Linke to external json file or api. (to display this as a formatted json.)
		* 	md_link			- "more data".  Link to external json file/api.  Json fields will be treated as 
		*					  Simple Assets fields (mdata or idata).  Authors can specify their display preferences 
		*					  for any of them by using regauthor.
		*	md_sa			- "more data". 	The id of a row in the Simple Asset moredata table.  This is an on-chain
		*					  resource which asset authors can use to avoid repeition of data and save RAM. (in development)
		*	
		*	ipfs/<full mime type>	- ipfs link  For example: ipfs/image/jpg
		*
		*	iframe			- link to html which can include javascript, css, webgl, etc.
		*	iframeb			- the string data for html which will render in an iframe
		*
		*
		* NOTE: Please contact us with requests for new data types.  We are especially interested in CSS animations.
		*
		*
		* @param priorityimg is used when you want the main image of some NFTs to be something other than the 
		* img type listed above, or if you want different NFT categories to have different types of main images
		* (for example, within one dapp, one category of NFTs may use on-chain binaries as their main image, while
		* another category of NFT may use links to webgl files).  These are rare use cases.  Most authors, can leave 
		* it blank: "".
		*
		* priorityimg is a JSON which assosiates an NFT category with a field name from idata or mdata.  The 
		* associated field will be used as the main image field for that category of NFT.
		*
		*
		* @return no return value
		*/
		ACTION authorreg( name author, string dappinfo, string fieldtypes, string priorityimg );
		using authorreg_action = action_wrapper< "authorreg"_n, &SimpleAssets::authorreg >;

		/*
		* Authors info update.
		*
		* This action updates author's information and the asset display recommendations. This action replaces
		* the fields dappinfo, fieldtypes, and priorityimg.
		* To remove author entry, call this action with null strings for dappinfo, fieldtypes, and priorityimg.
		*
		* (See authorreg action for parameter info.)
		*
		* @return no return value.
		*/
		ACTION authorupdate( name author, string dappinfo, string fieldtypes, string priorityimg );
		using authorupdate_action = action_wrapper< "authorupdate"_n, &SimpleAssets::authorupdate >;

		/*
		* Change author.
		*
		* This action change author. This action replaces author name
		*
		* @return no return value.
		*/

		ACTION changeauthor( name author, name newauthor, name owner, vector<uint64_t>& assetids, string memo );
		using changeauthor_action = action_wrapper< "changeauthor"_n, &SimpleAssets::changeauthor >;

		/*
		* Create a new asset.
		*
		* This action creates a new asset.
		*
		* @param author	is the asset's author. This account is allowed to update the asset's mdata.
		* @param category is asset category.
		* @param owner is asset owner.
		* @param idata is stringified JSON or sha256 string with immutable asset data.
		* @param mdata is stringified JSON or sha256 string with mutable asset data. It can be changed only by author.
		* @param requireclaim is true or false. If set to "false", the newly created asset will be transferred to the
		*                     owner (but author's RAM will be used until the asset is transferred again). If set to
		*                     "true", the author will remain to be the owner, but an offer will be created for the
		*                     account specified in the owner field to claim the asset using the owner's RAM.
		* @return no return value.
		*/
		ACTION create( name author, name category, name owner, string idata, string mdata, bool requireclaim );
		using create_action = action_wrapper< "create"_n, &SimpleAssets::create >;

		/*
		* Create a new log entry.
		*
		* This action is doeing nothing, and it can only be called by SimpleAsset contract. It creates an entry
		* in transaction trace, so that that third party explorers can retrieve new asset ID and other
		* information.
		*
		* @param author	is the asset's author. This account is allowed to update the asset's mdata.
		* @param category is asset category.
		* @param owner is asset owner.
		* @param idata is stringified JSON or sha256 string with immutable asset data.
		* @param mdata is stringified JSON or sha256 string with mutable asset data. It can be changed only by author.
		* @param requireclaim is true or false. If set to "false", the newly created asset will be transferred to the
		*                     owner (but author's RAM will be used until the asset is transferred again). If set to
		*                     "true", the author will remain to be the owner, but an offer will be created for the
		*                     account specified in the owner field to claim the asset using the owner's RAM.
		* @return no return value.
		*/
		ACTION createlog( name author, name category, name owner, string idata, string mdata, uint64_t assetid,
                                  bool requireclaim );
		using createlog_action = action_wrapper< "createlog"_n, &SimpleAssets::createlog >;

		/*
		* Create a new log entry for burn action.
		*
		* This action is doeing nothing, and it can only be called by SimpleAsset contract. It creates an entry
		* in transaction trace, so that that third party explorers can retrieve burn asset IDs and other
		* information.
		*
		* @param owner is current asset owner.
		* @param assetids is array of asset id's to burn.
		* @param memo is burn comment.
		* @return no return value.
		*/

		ACTION burnlog( name owner, vector<uint64_t>& assetids, string memo );
		using burnlog_action = action_wrapper< "burnlog"_n, &SimpleAssets::burnlog >;

		/*
		* Create a new log entry for burnnttlog action.
		*
		* This action is doeing nothing, and it can only be called by SimpleAsset contract. It creates an entry
		* in transaction trace, so that that third party explorers can retrieve burn asset IDs and other
		* information.
		*
		* @param owner is current asset owner.
		* @param assetids is array of asset id's to burnnttlog.
		* @param memo is burnnttlog comment.
		* @return no return value.
		*/

		ACTION burnnttlog( name owner, vector<uint64_t>& assetids, string memo );
		using burnnttlog_action = action_wrapper< "burnnttlog"_n, &SimpleAssets::burnnttlog >;

		/*
		* Create a new log entry for burnflog action.
		*
		* This action is doeing nothing, and it can only be called by SimpleAsset contract. It creates an entry
		* in transaction trace, so that that third party explorers can retrieve burn asset IDs and other
		* information.
		*
		* @param from is account that burns the token.
		* @param author is account of fungible token author.
		* @param quantity is amount to burn, example "1.00 WOOD".
		* @param memo is memo for burnf action.
		* @return no return value.
		*/

		ACTION burnflog( name from, name author, asset quantity, string memo );
		using burnflog_action = action_wrapper< "burnflog"_n, &SimpleAssets::burnflog >;

		/*
		* Claim asset.
		*
		* This action claims the specified assets (assuming they were offered to claimer by the asset owner).
		*
		* @param claimer is account claiming the asset.
		* @param assetids is array of asset id's to claim.
		* @return no return value.
		*/
		ACTION claim( name claimer, vector< uint64_t >& assetids );
		using claim_action = action_wrapper< "claim"_n, &SimpleAssets::claim >;

		/*
		* Transfers one or more assets.
		*
		* This action transfers one or more assets by changing scope.
		* Sender's RAM will be charged to transfer asset.
		* Transfer will fail if asset is offered for claim or is delegated.
		*
		* @param from is account who sends the asset.
		* @param to is account of receiver.
		* @param assetids is array of assetid's to transfer.
		* @param memo is transfers comment.
		* @return no return value.
		*/
		ACTION transfer( name from, name to, vector< uint64_t >& assetids, string memo );
		using transfer_action = action_wrapper< "transfer"_n, &SimpleAssets::transfer >;

		/*
		* Update assets data.
		*
		* This action updates asset's mutable data (mdata) field. It is only available for the author of an asset.
		*
		* @param author	is author account.
		* @param owner is current asset owner.
		* @param assetid is asset id to update.
		* @param mdata is stringified JSON with mutable assets data. All mdata will be replaced.
		* @return no return value.
		*/
		ACTION update( name author, name owner, uint64_t assetid, string mdata );
		using update_action = action_wrapper< "update"_n, &SimpleAssets::update >;

		/*
		* Offer asset for claim.
		*
		* This is an alternative to the transfer action. Offer can be used by an
		* asset owner to transfer the asset without using the their RAM. After an offer is made, the account
		* specified in {{newowner}} is able to make a claim, and take control of the asset using their RAM.
		* Offer action is not available if an asset is delegated (borrowed).
		*
		* @param owner is the accout of current owner.
		* @param newowner is the future owner of the asset.
		* @param assetids is array of asset id's to offer.
		* @param memo is memo for offer action.
		* @return no return value.
		*/
		ACTION offer( name owner, name newowner, vector< uint64_t >& assetids, string memo );
		using offer_action = action_wrapper< "offer"_n, &SimpleAssets::offer >;

		/*
		* Cancel offer.
		*
		* This action cancels an offer. Only the current owner of an asset is allowed to execute it.
		*
		* @param owner		- current asset owner account.
		* @param assetids	- array of asset id's to cancel from offer.
		* @return no return value.
		*/
		ACTION canceloffer( name owner, vector<uint64_t>& assetids );
		using canceloffer_action = action_wrapper< "canceloffer"_n, &SimpleAssets::canceloffer >;

		/*
		* Burn asset.
		*
		* This action wil ldestroy the assets specified in {{assetids}}. This action is only available for the asset
		* owner. After executing, the asset will disappear forever, and RAM used for asset will be released. All
		* attached fungible and non-fungible assets will be destroyed too.
		*
		* @param owner is current asset owner account.
		* @param assetids is array of asset id's to burn.
		* @param memo is memo for burn action.
		* @return no return value.
		*/
		ACTION burn( name owner, vector< uint64_t >& assetids, string memo );
		using burn_action = action_wrapper< "burn"_n, &SimpleAssets::burn >;

		/*
		* Delegate assets.
		*
		* This action delegates asset to {{to}} account. This action changes the asset owner by calling the transfer
		* action. It also adds a record in the delegates table to record the asset as borrowed.  This blocks
		* the asset from all owner actions (transfers, offers, burning by borrower).
		*
		* @param owner is current asset owner account.
		* @param to is borrower account name.
		* @param assetids is array of asset id's to delegate.
		* @param period	is time in seconds that the asset will be lent for. The lender cannot undelegate until
		*		 the period expires, however the receiver can transfer back at any time.
		* @param redelegate is allow more redelegate for to account or not.
		* @param memo is memo for delegate action.
		* @return no return value.
		*/
		ACTION delegate( name owner, name to, vector<uint64_t>& assetids, uint64_t period, bool redelegate, string memo );
		using delegate_action = action_wrapper< "delegate"_n, &SimpleAssets::delegate >;

		/*
		* Undelegate assets.
		*
		* This action undelegates assets from {{from}} account. Executing action by real owner will return asset
                * immediately, and the entry in the delegates table recording the borrowing will be erased.
		*
		* @param owner is the account of real owner of the assets.
		* @param assetids is array of asset id's to undelegate.
		* @return no return value.
		*/
		ACTION undelegate( name owner, vector< uint64_t >& assetids );
		using undelegate_action = action_wrapper< "undelegate"_n, &SimpleAssets::undelegate >;

		/*
		* Attach non-fungible token.
		*
		* This action attaches other NFTs to the specified NFT. Restrictions:
		* 1. Only the Asset Author can do this
		* 2. All assets must have the same author
		* 3. All assets much have the same owner
		*
		* @param owner is owner of NFTs.
		* @param assetidc is id of container NFT.
		* @param assetids is array of asset id's to attach.
		* @return no return value.
		*/
		ACTION attach( name owner, uint64_t assetidc, vector< uint64_t >& assetids );
		using attach_action = action_wrapper< "attach"_n, &SimpleAssets::attach >;

		/*
		* Detach non-fungible token.
		*
		* This action detaches NFTs from the specified NFT. Only the owner of the container asset is
		* allowed to execute this action.
		*
		* @param owner is owner of NFTs.
		* @param assetidc is the id of the NFT from which we are detaching.
		* @param assetids is the array of id's of the NFTS to be detached.
		* @return no return value.
		*/
		ACTION detach( name owner, uint64_t assetidc, vector< uint64_t >& assetids );
		using detach_t_action = action_wrapper< "detach"_n, &SimpleAssets::detach >;

		/*
		* Extend the delegation.
		*
		* This action extends the period of a delegated asset.
		*
		* @param owner is owner of NFTs.
		* @param assetidc is the id of the NFT for which we are extending the period.
		* @param period is number of seconds added to existing amount of period.
		* @return no return value.
		*/
		ACTION delegatemore( name owner, uint64_t assetidc, uint64_t period );
		using delegatemore_action = action_wrapper< "delegatemore"_n, &SimpleAssets::delegatemore >;

		/*
		* Attach fungible token.
		*
		* This action attaches FTs to the specified NFT. Restrictions:
		* 1. Only the Asset Author can do this
		* 2. All assets must have the same author
		* 3. All assets much have the same owner
		*
		* @param owner is the owner of the asset.
		* @param author	is author of the asset.
		* @param assetidc is id of container NFT.
		* @param quantity is quantity to attach and token name (for example: "10 WOOD", "42.00 GOLD").
		* @return no return value.
		*/
		ACTION attachf( name owner, name author, asset quantity, uint64_t assetidc );
		using attachf_t_action = action_wrapper< "attachf"_n, &SimpleAssets::attachf >;

		/*
		* Detach fungible tokens.
		*
		* This action detaches FTs from the specified NFT.
		*
		* @param owner is the owner of NFTs.
		* @param author	is the author of the assets.
		* @param assetidc is id of the container NFT.
		* @param quantity is quantity to detach and token name (for example: 10 WOOD, 42.00 GOLD).
		* @return no return value.
		*/
		ACTION detachf( name owner, name author, asset quantity, uint64_t assetidc );
		using detachf_t_action = action_wrapper< "detachf"_n, &SimpleAssets::detachf >;

		/*
		* Creates fungible token.
		*
		* This action creates a fungible token with specified maximum supply. Maximum supply and author control
		* cannot be modified after the token is created.
		*
		* @param author is fungible token author;
		* @param maximum_supply is maximum token supply, example "10000000.0000 GOLD", "10000000 SEED",
		* 	"100000000.00 WOOD". The amount must specify the exact precision.
		* @param authorctrl is IMPORTANT! If true(1) allows token author (and not just owner) to burnf and transferf.
		* 	Cannot be changed after creation!
		* @param data is stringified JSON (recommend including keys `img` and `name` for better displaying by markets).
		* @return no return value.
		*/
		ACTION createf( name author, asset maximum_supply, bool authorctrl, string data );
		using createf_action = action_wrapper< "createf"_n, &SimpleAssets::createf >;

		/*
		* Update fungible token.
		*
		* Update the data field of a fungible token.
		*
		* @param author is fungible token author.
		* @param sym is fungible token symbol ("GOLD", "WOOD", etc.).
		* @param data is stringified JSON (recommend including keys `img` and `name` for better displaying by markets).
		* @return no return value.
		*/
		ACTION updatef( name author, symbol sym, string data );
		using updatef_action = action_wrapper< "updatef"_n, &SimpleAssets::updatef >;

		/*
		* Issue fungible token.
		*
		* This action issues a fungible token.
		*
		* @param to is account receiver.
		* @param author is fungible token author.
		* @param quantity is amount to issue, example "1000.00 WOOD".
		* @param memo is issue comment.
		* @return no return value.
		*/
		ACTION issuef( name to, name author, asset quantity, string memo );
		using issuef_action = action_wrapper< "issuef"_n, &SimpleAssets::issuef >;

		/*
		* Transfer fungible token.
		*
		* This action transfers a specified quantity of fungible tokens.
		*
		* @param from is account who sends the token.
		* @param to is account of receiver.
		* @param author is account of fungible token author.
		* @param quantity is amount to transfer, example "1.00 WOOD".
		* @param memo is transfer's comment.
		* @return no return value.
		*/
		ACTION transferf( name from, name to, name author, asset quantity, string memo );
		using transferf_action = action_wrapper< "transferf"_n, &SimpleAssets::transferf >;

		/*
		* Offer fungible tokens.
		*
		* This action offer fungible tokens for another EOS user to claim.
		* This is an alternative to the transfer action. Offer can be used by a
		* FT owner to transfer the FTs without using their RAM. After an offer is made, the account
		* specified in {{newowner}} is able to make a claim, and take control of the asset using their RAM.
		* The FTs will be removed from the owner's balance while the offer is open.
		*
		* @param owner is original owner of the FT.
		* @param newowner is account which will be able to claim the offer.
		* @param author is account of fungible token author.
		* @param quantity is amount to transfer, example "1.00 WOOD".
		* @param memo is offer's comment;
		* @return no return value.
		*/
		ACTION offerf( name owner, name newowner, name author, asset quantity, string memo );
		using offerf_action = action_wrapper< "offerf"_n, &SimpleAssets::offerf >;

		/*
		* Cancel an offer of fungible tokens.
		*
		* This action cancels an offer of FTs.
		*
		* @param owner is original owner of the FT.
		* @param ftofferids is ID of the FT offer.
		* @return no return value.
		*/
		ACTION cancelofferf( name owner, vector< uint64_t >& ftofferids );
		using cancelofferf_action = action_wrapper< "cancelofferf"_n, &SimpleAssets::cancelofferf >;

		/*
		* Claim fungible tokens.
		*
		* This action claims FTs which have been offered.
		*
		* @param claimer is account claiming FTs which have been offered.
		* @param ftofferids is array of FT offer id's.
		* @return no return value.
		*/
		ACTION claimf( name claimer, vector< uint64_t >& ftofferids );
		using claimf_action = action_wrapper< "claimf"_n, &SimpleAssets::claimf >;

		/*
		* Burn fungible tokens
		*
		* This action burns a fungible token. This action is available for the token owner and author.
		* After executing,accounts balance and supply in stats table for this token will reduce by the
		* specified quantity.
		*
		* @param from is account that burns the token.
		* @param author is account of fungible token author.
		* @param quantity is amount to burn, example "1.00 WOOD".
		* @param memo is memo for burnf action.
		* @return no return value.
		*/
		ACTION burnf( name from, name author, asset quantity, string memo );
		using burnf_action = action_wrapper< "burnf"_n, &SimpleAssets::burnf >;

		/*
		* Open accoutns table.
		*
		* This action opens accounts table for specified fungible token.
		*
		* @param owner is account where create table with fungible token.
		* @param author is account of fungible token author.
		* @param symbol is token symbol, example "WOOD", "ROCK", "GOLD".
		* @param ram_payer is account who will pay for ram used for table creation.
		* @return no return value.
		*/
		ACTION openf( name owner, name author, const symbol& symbol, name ram_payer );
		using openf_action = action_wrapper< "openf"_n, &SimpleAssets::openf >;

		/*
		* Close accounts table.
		*
		* This action closes accounts table for provided fungible token and releases RAM.
		* Action works only if balance is zero.
		*
		* @param owner is account who woud like to close table with fungible token.
		* @param author is account of fungible token author.
		* @param symbol is token symbol, example "WOOD", "ROCK", "GOLD".
		* @return no return value.
		*/
		ACTION closef( name owner, name author, const symbol& symbol );
		using closef_action = action_wrapper< "closef"_n, &SimpleAssets::closef >;

		/*
		* Return current token supply.
		*
		* This function returns the current token supply.
		*
		* @param token_contract_account is contract to check.
		* @param author is fungible tokens author account.
		* @param sym_code is token symbol, example "WOOD", "ROCK", "GOLD".
		* @return asset
		*/
		static asset get_supply( name token_contract_account, name author, symbol_code sym_code );

		/*
		* Returns token balance for account.
		*
		* This function returns token balance for account.
		*
		* @param token_contract_account is contract to check;
		* @param owner is token holder account;
		* @param author is fungible tokens author account;
		* @param sym_code is token symbol, example "WOOD", "ROCK", "GOLD";
		* @return asset
		*/
		static asset get_balance( name token_contract_account, name owner, name author, symbol_code sym_code );

		/*
		* This action create a new Non transferable token (NTT).
		*
		* @param author	is asset's author, who will able to updated asset's mdata.
		* @param category is assets category.
		* @param owner is assets owner.
		* @param idata is stringified json or just sha256 string with immutable assets data
		* @param mdata is stringified json or just sha256 string with mutable assets data, can be changed only by author;
		* @param requireclaim is true or false. If disabled, upon creation, the asset will be transfered to owner (but
		*		  but AUTHOR'S memory will be used).  If enabled,
		*		  author will remain the owner, but an offer will be created for the account specified in
		*		  the owner field to claim the asset using the account's RAM.
		* @return no return value.
		*/
		ACTION createntt ( name author, name category, name owner, string idata, string mdata, bool requireclaim );
		using createntt_action = action_wrapper< "createntt"_n, &SimpleAssets::createntt >;
		
		/*
		* Create a new NTT log.
		*
		* This is empty action. Used by createntt action to log assetid so that third party explorers can
		* easily get new asset ids and other information.
		*
		* @param author	is asset's author, who will able to updated asset's mdata.
		* @param category is assets category.
		* @param owner is assets owner.
		* @param idata is stringified json or just sha256 string with immutable assets data.
		* @param mdata is stringified json or just sha256 string with mutable assets data, can be changed only by author.
		* @param assetid is id of the asset
		* @param requireclaim is true or false. If disabled, upon creation, the asset will be transfered to owner (but
		*		 but AUTHOR'S memory will be used until the asset is transferred again).  If enabled,
		*		 author will remain the owner, but an offer will be created for the account specified in
		*		 the owner field to claim the asset using the account's RAM.
		* @return no return value.
		*/
		ACTION createnttlog( name author, name category, name owner, string idata, string mdata, uint64_t assetid, bool requireclaim );
		using createnttlog_action = action_wrapper< "createnttlog"_n, &SimpleAssets::createnttlog >;

		/*
		* Claim NTT.
		*
		* This action claim the specified NTT asset (assuming it was offered to claimer by the asset owner).
		*
		* @param claimer is account claiming the NTT asset.
		* @param assetids is array of NTT assetid's to claim.
		* @return no return value.
		*/
		ACTION claimntt( name claimer, vector< uint64_t >& assetids );
		using claimntt_action = action_wrapper< "claimntt"_n, &SimpleAssets::claimntt >;		
		
		/*
		* Update NTT assets mdata.
		*
		* This action update NTT assets mutable data (mdata) field. Action is available only for authors.
		*
		* @param author	is authors account.
		* @param owner is current assets owner.
		* @param assetid is assetid to update.
		* @param mdata is stringified json with mutable assets data. All mdata will be replaced.
		* @return no return value.
		*/
		ACTION updatentt( name author, name owner, uint64_t assetid, string mdata );
		using updatentt_action = action_wrapper< "updatentt"_n, &SimpleAssets::updatentt >;		
		
		/*
		* Burn NTT asset.
		*
		* This action burn NTT asset {{assetid}}. This action is only available for the asset owner. After executing, the
		* asset will disappear forever, and RAM used for asset will be released.
		*
		* @param owner is current asset owner account.
		* @param assetids is array of assetid's to burn.
		* @param memo is memo for burn action.
		* @return no return value.
		*/
		ACTION burnntt( name owner, vector< uint64_t >& assetids, string memo );
		using burnntt_action = action_wrapper< "burnntt"_n, &SimpleAssets::burnntt >;

		/*
		* Add "more data" item.
		*
		* This action adds a "more data" record.  More data is an optional, on-chain way
		* of storing additional data about NFTs
		*
		* @param author is a name of data author
		* @param data is stringify json
		* @return no return value.
		*/
		ACTION mdadd( name author, string data );
		using mdadd_action = action_wrapper< "mdadd"_n, &SimpleAssets::mdadd >;

		/*
		* Create a new more data log entry. This is an internal action to provide id 
		*
		* This action can only be called by SimpleAsset contract. It creates an entry
		* in transaction trace, so that that third party explorers can retrieve new ID and other
		* information.
		*
		* @param id is id of more data
		* @param author	is the more data author. This account is allowed to update the more data.
		* @param data is stringified JSON string with more data. It can be changed only by author.
		* @return no return value.
		*/
		ACTION mdaddlog( uint64_t id, name author, string data );
		using mdaddlog_action = action_wrapper< "mdaddlog"_n, &SimpleAssets::mdaddlog >;

		/*
		* Update "more data" item.
		*
		* This action updates "more data" record by id
		*
		* @param id is id of more data
		* @param author is author of data
		* @param data is stringify json
		* @return no return value.
		*/
		ACTION mdupdate( uint64_t id, name author, string data );
		using mdupdate_action = action_wrapper< "mdupdate"_n, &SimpleAssets::mdupdate >;

		/*
		* Remove "more data" item.
		*
		* This action removes a "more data" record by id
		*
		* @param id is id of more data
		* @return no return value.
		*/
		ACTION mdremove( uint64_t id );
		using mdremove_action = action_wrapper< "mdremove"_n, &SimpleAssets::mdremove >;

		/*
		* Action for notification after transfering one or more assets.
		*
		* This action will notify author with help of require_recepient 
		* after transfers one or more assets.
		*
		* @param author is author of the asset.
		* @param from is account who sends the asset.
		* @param to is account of receiver.
		* @param assetids is array of assetid's to transfer.
		* @param memo is transfers comment.
		* @return no return value.
		*/
		ACTION saetransfer( name author, name from, name to, vector<uint64_t>& assetids, string memo );
		using saetransfer_action = action_wrapper< "saetransfer"_n, &SimpleAssets::saetransfer >;

		/*
		* Action for notification after burning asset.
		*
		* This action will notify author with help of require_recepient
		* after burn one or more assets.
		*
		* @param author is author of the asset.
		* @param owner is current asset owner account.
		* @param assetids is array of asset id's to burn.
		* @param memo is memo for burn action.
		* @return no return value.
		*/
		ACTION saeburn( name author, name owner, vector<uint64_t>& assetids, string memo );
		using saeburn_action = action_wrapper< "saeburn"_n, &SimpleAssets::saeburn >;

		/*
		* Action for notification after changing author of asset.
		*
		* This action will notify author with help of require_recepient
		* after chaning of one or more assets author.
		*
		* @param author is author of the asset.
		* @param newauthor is new author of the asset.
		* @param owner is current asset owner account.
		* @param assetids is array of asset id's to change author.
		* @param memo is memo for change author action.
		* @return no return value.
		*/
		ACTION saechauthor( name author, name newauthor, name owner, vector< tuple<uint64_t, name> >& assetids, string memo );
		using saechauthor_action = action_wrapper< "saechauthor"_n, &SimpleAssets::saechauthor >;

		/*
		* Action for notification after creating a new asset.
		*
		* This action will notify author with help of require_recepient
		* after creating a new asset.
		*
		* @param author	is the asset's author. This account is allowed to update the asset's mdata.
		* @param category is asset category.
		* @param owner is asset owner.
		* @param idata is stringified JSON or sha256 string with immutable asset data.
		* @param mdata is stringified JSON or sha256 string with mutable asset data. It can be changed only by author.
		* @param assetid is new asset id.
		* @param requireclaim is true or false. If set to "false", the newly created asset will be transferred to the
		*                     owner (but author's RAM will be used until the asset is transferred again). If set to
		*                     "true", the author will remain to be the owner, but an offer will be created for the
		*                     account specified in the owner field to claim the asset using the owner's RAM.
		* @return no return value.
		*/
		ACTION saecreate( name author, name category, name owner, string idata, string mdata, uint64_t assetid, bool requireclaim );
		using saecreate_action = action_wrapper< "saecreate"_n, &SimpleAssets::saecreate >;

		/*
		* Action for notification after claiming the assets.
		*
		* This action will notify author with help of require_recepient
		* after claiming the assets.
		*
		* @param claimer is account claiming the asset.
		* @param assetids is array of asset id's to claim.
		* @return no return value.
		*/

		ACTION saeclaim(name author, name claimer, vector< tuple<uint64_t, name> >& assetids);
		using saeclaim_action = action_wrapper< "saeclaim"_n, &SimpleAssets::saeclaim >;

		/*
		* Action for setting a ram payer for author and category.
		*
		* This action will add new record (only if regre is no same records for author and category) 
		* and set from_id to last avalable assetsid. It will works only for new created assets.
		*
		* @param author is account claiming the asset.
		* @param category is asset category.
		* @param usearam is flag for using ram 
		* @return no return value.
		*/
		ACTION setarampayer( name author, name category, bool usearam );
		using setarampayer_action = action_wrapper< "setarampayer"_n, &SimpleAssets::setarampayer >;

		/*
		* Action for deleting a ram payer for author and category.
		*
		* This action will delete record for arampayer table
		*
		* @param id is id of arampayer record
		* @return no return value.
		*/
		ACTION delarampayer( uint64_t id );
		using delarampayer_action = action_wrapper< "delarampayer"_n, &SimpleAssets::delarampayer >;

	public:
		enum id_type { asset_id = 0, deferred_id = 1, offer_id = 2, md_id = 3 };

		/*
		* Validate id 
		*
		* Validate is id inside of allowed range ( asset_id = 0, deferred_id = 1, offer_id = 2, md_id = 3 )
		*
		* @param type is id number must be ( asset_id = 0, deferred_id = 1, offer_id = 2, md_id = 3 )
		* @return id .
		*/

		static void checkid( uint64_t type ) {

			check( false, "Wrong id_type. Value must be asset_id = 0, deferred_id = 1, offer_id = 2, md_id = 3. You entered: " + to_string( type ) );
		}

		/*
		* Get next id
		*
		* sa_getnextid action to get next id, return id for a new asset or new fungible token or more data or deferred transaction id.
		*
		* @param sa_contract_name is Simple Assets contract name
		* @param type is id number must be ( asset_id = 0, deferred_id = 1, offer_id = 2, md_id = 3 )
		* @return id 
		*/

		static uint64_t sa_getnextid( name sa_contract_name, id_type type ) {

			conf config( sa_contract_name, sa_contract_name.value );

			global cstate = config.exists() ? config.get() : global{};

			uint64_t result = 0;

			switch ( type ) {
			case asset_id:
				result = cstate.lnftid + 1;
				break;
			case offer_id:
			case deferred_id:
				result = cstate.defid + 1;
				break;
			case md_id:
				result = cstate.mdid + 1;
				break;
			default:
				checkid( type );
			}

			return result;
		}

		static string sa_time_to_wait(uint64_t time_in_seconds) {
			uint64_t s, h, m = 0;
			m = time_in_seconds / 60;
			h = m / 60;
			return "Time to wait " + to_string(int(h)) + " hours " + to_string(int(m % 60)) + " minutes " + to_string(int(time_in_seconds % 60)) + " seconds";
		}

	private:
		const uint16_t MAX_MEMO_SIZE = 512;
		const uint64_t IMPOSSIBLE_ID = 1;

		/*
		* Get new asset id.
		*
		* This function return new asset id.
		*
		* @param type is flag for type of transaction;
		* @return new asset id
		*/
		uint64_t getid( id_type type );

		/*
		* Get fungible token index.
		*
		* This function return fungible token index.
		*
		* @param author is author name ;
		* @param symbol is symbol;
		* @return new fungible token index
		*/
		uint64_t getFTIndex( name author, symbol symbol );
		void attachdeatch( name owner, name author, asset quantity, uint64_t assetidc, bool attach );
		void sub_balancef( name owner, name author, asset value );
		void add_balancef( name owner, name author, asset value, name ram_payer );
		void check_empty_vector( vector< uint64_t >& vector_ids, string vector_name = "assetids" );
		void check_memo_size( const string & memo );
		name get_payer( name author, name category, uint64_t id );

		template<typename... Args>
		void sendEvent( name author, name rampayer, name seaction, const tuple<Args...> &tup );

		public:
		/*
		* Authors table. Can be used by asset markets, asset explorers, or wallets for correct asset
		* data presentation.
		* Scope: self
		*/
		TABLE sauthor {
			name			author;
			string			dappinfo;
			string			fieldtypes;
			string			priorityimg;

			auto primary_key() const {
				return author.value;
			}

		};
		typedef eosio::multi_index< "authors"_n, sauthor > authors;

		/*
		* Fungible token accounts stats info: Max Supply, Current Supply, issuer (author), token unique id, authorctrl.
		* authorctrl if true(1) allow token author (and not just owner) to burn and transfer.
		* Scope: token author
		*/
		TABLE currency_stats {
			asset		supply;
			asset		max_supply;
			name		issuer;
			uint64_t 	id;
			bool		authorctrl;
			string		data;

			uint64_t primary_key()const {
				return supply.symbol.code().raw();
			}
		};
		typedef eosio::multi_index< "stat"_n, currency_stats > stats;

		/*
		* Fungible token accounts table which stores information about balances.
		* Scope: token owner
		*/
		TABLE account {
			uint64_t	id;
			name		author;
			asset		balance;

			uint64_t primary_key()const {
				return id;
			}
		};

		typedef eosio::multi_index< "accounts"_n, account > accounts;

		/*
		* Assets table which stores information about simple assets.
		* Scope: asset owner
		*/
		TABLE sasset {
			uint64_t                id;
			name                    owner;
			name                    author;
			name                    category;
			string                  idata; // immutable data
			string                  mdata; // mutable data
			vector<sasset>          container;
			vector<account>         containerf;

			auto primary_key() const {
				return id;
			}
			uint64_t by_author() const {
				return author.value;
			}

		};
		typedef eosio::multi_index< "sassets"_n, sasset,
			eosio::indexed_by< "author"_n, eosio::const_mem_fun<sasset, uint64_t, &sasset::by_author> >
			> sassets;

		/*
		* NTT table which stores information about Non transferable tokens.
		* Scope: asset owner
		*/
		TABLE snttasset {
			uint64_t                id;
			name                    owner;
			name                    author;
			name                    category;
			string                  idata; // immutable data
			string                  mdata; // mutable data

			auto primary_key() const {
				return id;
			}
			uint64_t by_author() const {
				return author.value;
			}

		};
		typedef eosio::multi_index< "snttassets"_n, snttasset,
			eosio::indexed_by< "author"_n, eosio::const_mem_fun<snttasset, uint64_t, &snttasset::by_author> >
			> snttassets;

		/*
		* Offers table keeps records of open offers of assets (ie. assets waiting to be claimed by their
		* intendend recipients. Scope: self
		*/
		TABLE soffer {
			uint64_t		assetid;
			name			owner;
			name			offeredto;
			uint64_t		cdate;

			auto primary_key() const {
				return assetid;
			}
			uint64_t by_owner() const {
				return owner.value;
			}
			uint64_t by_offeredto() const {
				return offeredto.value;
			}
		};
		typedef eosio::multi_index< "offers"_n, soffer,
			eosio::indexed_by< "owner"_n, eosio::const_mem_fun< soffer, uint64_t, &soffer::by_owner > >,
			eosio::indexed_by< "offeredto"_n, eosio::const_mem_fun< soffer, uint64_t, &soffer::by_offeredto > >
			> offers;

		/*
		* Offers table keeps records of open offers of FT (ie. waiting to be claimed by their
		* intendend recipients. Scope: self
		*/
		TABLE sofferf {
			uint64_t		id;
			name			author;
			name			owner;
			asset			quantity;
			name			offeredto;
			uint64_t		cdate;

			auto primary_key() const {
				return id;
			}
			uint64_t by_owner() const {
				return owner.value;
			}
			uint64_t by_offeredto() const {
				return offeredto.value;
			}
		};
		typedef eosio::multi_index< "offerfs"_n, sofferf,
			eosio::indexed_by< "owner"_n, eosio::const_mem_fun< sofferf, uint64_t, &sofferf::by_owner > >,
			eosio::indexed_by< "offeredto"_n, eosio::const_mem_fun< sofferf, uint64_t, &sofferf::by_offeredto > >
			> offerfs;

		/*
		* NTT Offers table keeps records of open offers of NTT assets (ie. assets waiting to be claimed by their
		* intendend recipients. Scope: self
		*/
		TABLE snttoffer {
			uint64_t		assetid;
			name			owner;
			name			offeredto;
			uint64_t		cdate;

			auto primary_key() const {
				return assetid;
			}
			uint64_t by_owner() const {
				return owner.value;
			}
			uint64_t by_offeredto() const {
				return offeredto.value;
			}
		};
		typedef eosio::multi_index< "nttoffers"_n, snttoffer,
			eosio::indexed_by< "owner"_n, eosio::const_mem_fun< snttoffer, uint64_t, &snttoffer::by_owner > >,
			eosio::indexed_by< "offeredto"_n, eosio::const_mem_fun< snttoffer, uint64_t, &snttoffer::by_offeredto > >
			> nttoffers;

		/*
		* Delegates table keeps records about borrowed assets. Scope: self
		*/
		TABLE sdelegate {
			uint64_t		assetid;
			name			owner;
			name			delegatedto;
			uint64_t		cdate;
			uint64_t		period;
			bool			redelegate;
			string			memo;

			auto primary_key() const {
				return assetid;
			}
			uint64_t by_owner() const {
				return owner.value;
			}
			uint64_t by_delegatedto() const {
				return delegatedto.value;
			}
		};
		typedef eosio::multi_index< "delegates"_n, sdelegate,
			eosio::indexed_by< "owner"_n, eosio::const_mem_fun< sdelegate, uint64_t, &sdelegate::by_owner > >,
			eosio::indexed_by< "delegatedto"_n, eosio::const_mem_fun< sdelegate, uint64_t, &sdelegate::by_delegatedto > >
		> delegates;

		/*
		* More data table where assets can store additional info to save RAM. Scope: self
		*/
		TABLE smoredata{
			uint64_t		id;
			name			author;
			string			data;

			auto primary_key() const {
				return id;
			}

			uint64_t by_author() const {
				return author.value;
			}
		};
		typedef eosio::multi_index< "moredata"_n, smoredata	,
			eosio::indexed_by< "author"_n, eosio::const_mem_fun< smoredata, uint64_t, &smoredata::by_author > >
		> moredata;

		/*
		* Ram payer table
		*/
		TABLE sarampayer{
			uint64_t	id;
			name		author;
			name		category;
			bool		usearam;
			uint64_t	from_id;

			auto primary_key() const {
				return id;
			}

			uint64_t by_author() const {
				return author.value;
			}
		};
		typedef eosio::multi_index< "arampayers"_n, sarampayer,
			eosio::indexed_by< "author"_n, eosio::const_mem_fun< sarampayer, uint64_t, &sarampayer::by_author > >
		> arampayers;

		/*
		* global singelton table, used for assetid building. Scope: self
		*/
		TABLE global {
			global() {}
			uint64_t lnftid = 100000000000000;
			uint64_t defid = 1000000;
			uint64_t mdid = 100000000;
			uint64_t spare2 = 0;

			EOSLIB_SERIALIZE( global, ( lnftid )( defid )( mdid )( spare2 ) )
		};
		typedef eosio::singleton< "global"_n, global > conf; /// singleton

		/*
		* Helps external contracts parse actions and tables correctly (Usefull for decentralized exchanges,
		* marketplaces and other contracts that use multiple tokens)
		* Marketplaces, exchanges and other reliant contracts will be able to view this info using the following code.
		*   Configs configs("simpl1assets"_n, "simpl1assets"_n.value);
		*	configs.get("simpl1assets"_n);
		*/
		TABLE tokenconfigs {
			name			standard;
			string			version;
		};
		typedef singleton< "tokenconfigs"_n, tokenconfigs > Configs;

		private:
		moredata moredatat		= { _self, _self.value };
		offers offert			= { _self, _self.value };
		offerfs offerft			= { _self, _self.value };
		delegates delegatet		= { _self, _self.value };
		authors authort			= { _self, _self.value };
		nttoffers nttoffert		= { _self, _self.value };
		arampayers arampayert	= { _self, _self.value };
		global _cstate; /// global state
};