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