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#lang racket
(provide
;; Struct definitions
nutrient-measurement
nutrient-measurement?
nutrient-measurement-id nutrient-measurement-measured-on
;; SQL CRUD
(contract-out
[create-nutrient-measurement! (-> string?
(listof (cons/c
nutrient?
number?))
nutrient-measurement?)]
[get-nutrient-measurements (-> (listof nutrient-measurement?))]
[get-nutrient-measurement (->* ()
(#:id (or/c #f exact-nonnegative-integer?)
#:measured-on (or/c #f string?))
(or/c nutrient-measurement? #f))]
[get-nutrient-measurement-values (-> nutrient-measurement?
(listof (cons/c
nutrient?
number?)))]
[get-nutrient-measurement-value (-> nutrient-measurement?
nutrient?
number?)]
[get-latest-nutrient-measurement-value (-> nutrient? number?)]
[delete-nutrient-measurement! (-> nutrient-measurement?
void?)]))
(require racket/contract
db
sql
"../db/conn.rkt"
"nutrient.rkt")
;; Instances of this struct are persisted in the nutrient_measurements table.
(struct nutrient-measurement (id measured-on) #:transparent)
;; CREATE
(define (create-nutrient-measurement! measured-on nutrient-values)
(define existing-nutrient-measurement (get-nutrient-measurement #:measured-on measured-on))
(define (new-nutrient-measurement)
(with-tx
(query-exec (current-conn)
(insert #:into nutrient_measurements
#:set [measured_on ,measured-on]))
(define nm-id (nutrient-measurement-id (get-nutrient-measurement #:measured-on measured-on)))
(query-exec (current-conn)
(insert #:into nutrient_value_sets
#:set [nutrient_measurement_id ,nm-id]))
(define nvs-id (query-value (current-conn)
(select id
#:from nutrient_value_sets
#:where (= nutrient_measurement_id ,nm-id))))
(for ([nv nutrient-values])
(match nv
[(cons n v)
(query-exec (current-conn)
(insert #:into nutrient_values
#:set
[value_set_id ,nvs-id]
[nutrient_id ,(nutrient-id n)]
[value_ppm ,v]))])))
(get-nutrient-measurement #:measured-on measured-on))
(or existing-nutrient-measurement
(new-nutrient-measurement)))
;; READ
(define (get-nutrient-measurements)
(for/list ([(id* measured-on*)
(in-query (current-conn)
(select id measured_on
#:from nutrient_measurements
#:order-by measured_on #:asc))])
(nutrient-measurement id* measured-on*)))
(define (get-nutrient-measurement #:id [id #f]
#:measured-on [measured-on #f])
(define (where-expr)
(define clauses
(filter values
(list
(and id (format "id = ~e" id))
(and measured-on (format "measured_on = ~e" measured-on)))))
(cond
[(null? clauses) ""]
[else (format "WHERE ~a" (string-join clauses " AND "))]))
(define query (string-join
`("SELECT id, measured_on"
"FROM nutrient_measurements"
,(where-expr)
"ORDER BY id ASC"
"LIMIT 1")))
(match (query-maybe-row (current-conn) query)
[(vector id* measured-on*)
(nutrient-measurement id* measured-on*)]
[#f #f]))
(define (get-nutrient-measurement-values nutrient-measurement)
(for/list ([(nutrient-id name formula value_ppm)
(in-query (current-conn)
(string-join
'("SELECT n.id, n.canonical_name, n.formula, nv.value_ppm"
"FROM nutrient_values nv"
"JOIN nutrient_value_sets nvs ON nvs.id = nv.value_set_id"
"JOIN nutrient_measurements nm ON nm.id = nvs.nutrient_measurement_id"
"JOIN nutrients n ON n.id = nv.nutrient_id"
"WHERE nm.id = $1"))
(nutrient-measurement-id nutrient-measurement))])
(cons (nutrient nutrient-id name formula) value_ppm)))
(define (get-nutrient-measurement-value nutrient-measurement nutrient)
(query-maybe-value (current-conn)
(string-join
'("SELECT value_ppm"
"FROM nutrient_values nv"
"JOIN nutrient_value_sets nvs ON nvs.id = nv.value_set_id"
"JOIN nutrient_measurements nm ON nm.id = nvs.nutrient_measurement_id"
"WHERE nm.id = $1 AND nv.nutrient_id = $2"))
(nutrient-measurement-id nutrient-measurement)
(nutrient-id nutrient)))
(define (get-latest-nutrient-measurement-value nutrient)
(query-maybe-value (current-conn)
(string-join
'("SELECT value_ppm"
"FROM nutrient_values nv"
"JOIN nutrient_value_sets nvs ON nvs.id = nv.value_set_id"
"JOIN nutrient_measurements nm ON nm.id = nvs.nutrient_measurement_id"
"WHERE nv.nutrient_id = $1"
"ORDER BY nm.measured_on DESC"
"LIMIT 1"))
(nutrient-id nutrient)))
;; UPDATE
;; DELETE
(define (delete-nutrient-measurement! nutrient-measurement)
(define id (nutrient-measurement-id nutrient-measurement))
(query-exec (current-conn)
(delete #:from nutrient_measurements
#:where (= id ,id))))
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