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#lang racket
(provide nutrient
nutrient?
nutrient-id
nutrient-canonical-name
nutrient-french-name
nutrient-formula
(contract-out [create-nutrient! (-> string? string? string? nutrient?)]
[get-nutrients (-> (listof nutrient?))]
[get-nutrient
(->* () (#:id db-id? #:name string? #:formula string?) (or/c nutrient? #f))]
[update-nutrient!
(->* (nutrient?)
(#:name (or/c #f string?) #:formula (or/c #f string?))
(or/c nutrient? #f))]
[delete-nutrient! (-> nutrient? void?)]))
(require db
sql
"../db/conn.rkt"
"utils.rkt")
(struct nutrient (id canonical-name french-name formula)
#:transparent
#:property prop:custom-write
(λ (v out _) (fprintf out "#<~a ~a>" (nutrient-id v) (nutrient-canonical-name v))))
;; CREATE
(define (create-nutrient! canonical-name french-name formula)
(or (get-nutrient #:name canonical-name #:formula formula)
(with-tx (query-exec (current-conn)
(insert #:into nutrients
#:set [canonical_name ,canonical-name]
[french_name ,french-name]
[formula ,formula]))
(get-nutrient #:name canonical-name))))
;; READ
(define (row->nutrient row)
(match-define (vector id canonical-name french-name formula) row)
(nutrient id canonical-name french-name formula))
(define (get-nutrients)
(map row->nutrient
(query-rows
(current-conn)
(select id canonical_name french_name formula #:from nutrients #:order-by id #:asc))))
(define (get-nutrient #:id [id #f] #:name [canonical-name #f] #:formula [formula #f])
(define where
(cond
[(and id canonical-name formula)
(scalar-expr-qq (and (= id ,id) (= canonical_name ,canonical-name)))]
[id (scalar-expr-qq (= id ,id))]
[(and canonical-name formula)
(scalar-expr-qq (and (= canonical_name ,canonical-name) (= formula ,formula)))]
[canonical-name (scalar-expr-qq (= canonical_name ,canonical-name))]
[formula (scalar-expr-qq (= formula ,formula))]))
(match (query-maybe-row (current-conn)
(select id
canonical_name
french_name
formula
#:from nutrients
#:where (ScalarExpr:AST ,where)
#:order-by id
#:asc
#:limit 1))
[(vector id canonical-name french-name formula) (nutrient id canonical-name french-name formula)]
[#f #f]))
;; UPDATE
(define (update-nutrient! nutrient #:name [name #f] #:formula [formula #f])
(define id (nutrient-id nutrient))
(cond
[(and name formula)
(query-exec
(current-conn)
(update nutrients #:set [canonical_name ,name] [formula ,formula] #:where (= id ,id)))]
[name
(query-exec (current-conn) (update nutrients #:set [canonical_name ,name] #:where (= id ,id)))]
[formula
(query-exec (current-conn) (update nutrients #:set [formula ,formula] #:where (= id ,id)))]
[else (void)])
(or (get-nutrient #:id id) (error 'update-nutrient! "No nutrient with id ~a" id)))
;; DELETE
(define (delete-nutrient! nutrient)
(query-exec (current-conn) (delete #:from nutrients #:where (= id ,(nutrient-id nutrient)))))
(module+ test
(require rackunit
rackunit/text-ui
"../db/conn.rkt"
"../db/migrations.rkt")
(run-tests (test-suite "Nutrient model"
#:before (λ ()
(connect! #:path 'memory)
(migrate-all!))
#:after (λ () (disconnect!))
(test-case "Create nutrients"
(check-equal? (length (get-nutrients)) 0)
(create-nutrient! "Examplium" "" "Ex")
(check-equal? (length (get-nutrients)) 1)
(create-nutrient! "Ignorium" "" "Ig")
(check-equal? (length (get-nutrients)) 2))
(test-case "Read nutrient"
(define examplium (get-nutrient #:id 1))
(check-true (nutrient? examplium))
(check-equal? (nutrient-id examplium) 1))
(test-case "Read nutrient by name"
(define examplium (get-nutrient #:name "Examplium"))
(check-true (nutrient? examplium))
(check-equal? (nutrient-canonical-name examplium) "Examplium"))
(test-case "Read nutrient by formula"
(define examplium (get-nutrient #:formula "Ex"))
(check-true (nutrient? examplium))
(check-equal? (nutrient-formula examplium) "Ex"))
(test-case "Read inexisting nutrient"
(check-false (get-nutrient #:name "Inexistium")))
(test-case "Update nutrient name"
(define examplium (get-nutrient #:name "Examplium"))
(define examplium-nitrate (update-nutrient! examplium #:name "Examplium Nitrate"))
(check-equal? (length (get-nutrients)) 2)
(check-equal? (nutrient-canonical-name examplium-nitrate) "Examplium Nitrate")
(check-equal? (nutrient-formula examplium-nitrate) "Ex"))
(test-case "Update nutrient formula"
(define examplium-nitrate (get-nutrient #:name "Examplium Nitrate"))
(define examplium-sulfate (update-nutrient! examplium-nitrate #:formula "ExSO4"))
(check-equal? (length (get-nutrients)) 2)
(check-equal? (nutrient-canonical-name examplium-sulfate) "Examplium Nitrate")
(check-equal? (nutrient-formula examplium-sulfate) "ExSO4"))
(test-case "Update nutrient name and formula"
(define examplium-nitrate (get-nutrient #:name "Examplium Nitrate"))
(define examplium-sulfate
(update-nutrient! examplium-nitrate #:name "Examplium Sulfate" #:formula "ExNO3"))
(check-equal? (length (get-nutrients)) 2)
(check-equal? (nutrient-canonical-name examplium-sulfate) "Examplium Sulfate")
(check-equal? (nutrient-formula examplium-sulfate) "ExNO3"))
(test-case "Delete nutrient"
(define examplium-sulfate (get-nutrient #:name "Examplium Sulfate"))
(delete-nutrient! examplium-sulfate)
(check-equal? (length (get-nutrients)) 1)
(define ignorium (get-nutrient #:name "Ignorium"))
(delete-nutrient! ignorium)
(check-equal? (length (get-nutrients)) 0)))))
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