NFT

1. create an collection class

const api = ... // karura api

const call = api.tx.nft.createClass(
    // file CID on ipfs
    'bafybeicyv4abz4fjbirabb322bd5c6bcoitoqjrh4ea75psovp62lmy724',
    // the properties of the class:
    //     Transferable: 0b00000001,
    //     Burnable: 0b00000010,
    //     Mintable: 0b00000100,
    //     ClassPropertiesMutable: 0b0001000
    // 0b00001111 means that [Transferable, Burnable, Mintable, Mutable]
    0b00001111,
    // attributes for the collections
    api.createType("Attributes", {})   
)

await call.signAndSend(...)

2. mint NFT
**Mint NFT will reserved some tokens, pls. ensure the owner has enough token.
The owner address is not the creator address, it can be get from `api.query.ormlNFT.classes`**

const api = ... // karura api
const classId = ... // the classId of NFT 
const to = ... // to address
const quantity = 1 // mint quantity
const managerAccount = ... // the class creator

// query the classInfo first
const classInfo = await api.query.ormlNFT.classes(classId);

// get the class owner account
const owner = classInfo.unwrapOrDefault().owner.toString();


const call = api.tx.proxy.proxy(owner, 'Any', api.tx.nft.mint(
    // to address
    to, 
    // class id
    classId, 
    // special CID for the NFT
    '', 
    // special attributes for the NFT
    api.createType('Attributes', {}),
    // mint quantity
    quantity
))

await call.signAndSend(managerAccount);

3. transfer NFT

const api = ... // karura api
const classId = ... // the classId of NFT
const toAddress = ...
const tokenId = ...
const nftOwnerAccount = ... // the owner of the nft

const call = api.tx.nft.transfer(to, [classId, tokenId]);

await call.signAndSend(nftOwnerAccount)

4. query all NFTs in `classId` belong to `account`

const api = ...
const classId = ... // the classId of NFT
const account = ... 

const tokens = await api.query.ormlNFT.tokensByOwner.entries(account, classId);

const tokenIds = tokens.map(([key, value]) => {
    const tokenId = key.args[2].toString();
    
    return tokenId
})

5. update the `classId` properties

const api = ... // karura api
const classId = ... // the classId of NFT
const managerAccount = ... // the class creator

// query the classInfo first
const classInfo = await api.query.ormlNFT.classes(classId);

// get the class owner account
const owner = classInfo.unwrapOrDefault().owner.toString();

const call = api.tx.proxy.proxy(
   owner,
   'Any',
   api.tx.nft.updateClassProperties(
       classId, 
       // new properties
       0b00001111
   )
)

await call.signAndSend(managerAccount)