;; use the SIP009 interface (testnet)
;; trait deployed by deployer address from ./settings/Devnet.toml
(impl-trait 'SP1AFJFQXPMTNR2BHAJ5B3Z29YMEWDMBKXCTQJXKA.nft-trait.nft-trait)

;; define a new NFT. Make sure to replace MY-OWN-NFT
(define-non-fungible-token BNS-BILL uint)

;; Store the last issues token ID
(define-data-var last-id uint u0)

;; Claim a new NFT
(define-public (claim)
  (mint tx-sender))

;; SIP009: Transfer token to a specified principal
(define-public (transfer (token-id uint) (sender principal) (recipient principal))
  (begin
     (asserts! (is-eq tx-sender sender) (err u403))
   
     (nft-transfer? BNS-BILL token-id sender recipient)))

(define-public (transfer-memo (token-id uint) (sender principal) (recipient principal) (memo (buff 34)))
  (begin 
    (try! (transfer token-id sender recipient))
    (print memo)
    (ok true)))

;; SIP009: Get the owner of the specified token ID
(define-read-only (get-owner (token-id uint))
 
  (ok (nft-get-owner? BNS-BILL token-id)))

;; SIP009: Get the last token ID
(define-read-only (get-last-token-id)
  (ok (var-get last-id)))

;; SIP009: Get the token URI. You can set it to any other URI
(define-read-only (get-token-uri (token-id uint))
  (ok (some "https://bafybeib3dzo5hyhqt4kiccq7e2umymum6nafwgzy63di65pqhukr3mimim.ipfs.nftstorage.link/{id}.json")))

;; Internal - Mint new NFT
(define-private (mint (new-owner principal))
    (let ((next-id (+ u1 (var-get last-id))))
      (var-set last-id next-id)
      ;; Make sure to replace MY-OWN-NFT
      (nft-mint? BNS-BILL next-id new-owner)))