opposite-emerald-donkey

;; Errors 
(define-constant ERR-UNAUTHORIZED u401)
(define-constant ERR-NOT-OWNER u402)
(define-constant ERR-INVALID-PARAMETERS u403)
(define-constant ERR-NOT-ENOUGH-FUND u101)

(impl-trait 'SP3FBR2AGK5H9QBDH3EEN6DF8EK8JY7RX8QJ5SVTE.sip-010-trait-ft-standard.sip-010-trait)

;; Constants
(define-constant INITSUPPLY u12500000000000000)

;; Variables
(define-fungible-token WRLD)
(define-data-var contract-owner principal tx-sender) 



;; SIP-10 Functions
(define-public (transfer (amount uint) (from principal) (to principal) (memo (optional (buff 34))))
    (begin
        (asserts! (is-eq from tx-sender)
            (err ERR-UNAUTHORIZED))
        ;; Perform the token transfer
        (ft-transfer? WRLD amount from to)
    )
)


;; DEFINE METADATA
(define-data-var token-uri (optional (string-utf8 256)) (some u"https://api.jsonserve.com/LFP4wh"))

(define-public (set-token-uri (value (string-utf8 256)))
    (begin
        (asserts! (is-eq tx-sender (var-get contract-owner)) (err ERR-UNAUTHORIZED))
        (var-set token-uri (some value))
        (ok (print {
              notification: "token-metadata-update",
              payload: {
                contract-id: (as-contract tx-sender),
                token-class: "ft"
              }
            })
        )
    )
)


(define-read-only (get-balance (owner principal))
  (ok (ft-get-balance WRLD owner))
)
(define-read-only (get-name)
  (ok "WORLD COIN")
)

(define-read-only (get-symbol)
  (ok "WRLD")
)

(define-read-only (get-decimals)
  (ok u4)
)

(define-read-only (get-total-supply)
  (ok (ft-get-supply WRLD))
)

(define-read-only (get-token-uri)
  (ok (var-get token-uri))
)

;; ---------------------------------------------------------
;; Utility Functions
;; ---------------------------------------------------------
(define-public (send-many (recipients (list 200 { to: principal, amount: uint, memo: (optional (buff 34)) })))
  (fold check-err (map send-token recipients) (ok true))
)

(define-private (check-err (result (response bool uint)) (prior (response bool uint)))
  (match prior ok-value result err-value (err err-value))
)

(define-private (send-token (recipient { to: principal, amount: uint, memo: (optional (buff 34)) }))
  (send-token-with-memo (get amount recipient) (get to recipient) (get memo recipient))
)

(define-private (send-token-with-memo (amount uint) (to principal) (memo (optional (buff 34))))
  (let ((transferOk (try! (transfer amount tx-sender to memo))))
    (ok transferOk)
  )
)

;; ---------------------------------------------------------
;; Mint
;; ---------------------------------------------------------
(begin
    (try! (ft-mint? WRLD INITSUPPLY (var-get contract-owner)))
)