;; car-registry.clar
;; Manages user car registrations for verified renters.
;; Constants
(define-constant err-not-authorized (err u100))
(define-constant err-car-not-found (err u101))
;; Data Variables
(define-data-var car-counter uint u0)
;; Data Maps
(define-map cars
uint
{
owner: principal,
plate-number: (string-ascii 20),
make: (string-ascii 50),
model: (string-ascii 50),
year: uint
}
)
;; Keep track of cars owned by a user
(define-map owner-cars principal (list 50 uint))
;; Register a car
(define-public (register-car (plate-number (string-ascii 20)) (make (string-ascii 50)) (model (string-ascii 50)) (year uint))
(let
(
(car-id (+ (var-get car-counter) u1))
;; For a fully strict implementation, we would check if the user is verified here
;; (is-verified (unwrap! (contract-call? .user-registry is-user-verified tx-sender) err-user-not-verified))
)
;; Optionally restrict to verified users
;; (asserts! is-verified err-user-not-verified)
(map-set cars car-id {
owner: tx-sender,
plate-number: plate-number,
make: make,
model: model,
year: year
})
;; Add to owner's list of cars
(let
((current-cars (default-to (list) (map-get? owner-cars tx-sender))))
(map-set owner-cars tx-sender (unwrap! (as-max-len? (append current-cars car-id) u50) err-not-authorized))
)
(var-set car-counter car-id)
(ok car-id)
)
)
;; Update car details
(define-public (update-car (car-id uint) (plate-number (string-ascii 20)) (make (string-ascii 50)) (model (string-ascii 50)) (year uint))
(let
(
(car (unwrap! (map-get? cars car-id) err-car-not-found))
)
(asserts! (is-eq (get owner car) tx-sender) err-not-authorized)
(ok (map-set cars car-id {
owner: tx-sender,
plate-number: plate-number,
make: make,
model: model,
year: year
}))
)
)
;; Read-only functions
(define-read-only (get-car (car-id uint))
(map-get? cars car-id)
)
(define-read-only (get-owner-cars (owner principal))
(default-to (list ) (map-get? owner-cars owner))
)