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