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