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#lang racket
(provide crop-requirement
crop-requirement?
crop-requirement-id
crop-requirement-profile
crop-requirement-crop-id
(rename-out [crop-requirement-nutrient-values crop-requirement-values])
(contract-out
[create-crop-requirement! (->* (string? nutrient-value-hash/c) (crop?) crop-requirement?)]
[get-crop-requirements (-> (listof crop-requirement?))]
[get-crop-requirement
(->* () (#:id exact-nonnegative-integer? #:profile string?) (or/c crop-requirement? #f))]
[get-crop-requirement-values (-> crop-requirement-or-id/c nutrient-value-hash/c)]
[get-crop-requirement-value (-> crop-requirement-or-id/c nutrient? maybe-nutrient-value?)]
[delete-crop-requirement! (-> crop-requirement-or-id/c void?)]
[average-crop-requirement-nutrient-values
(-> (listof (cons/c crop-requirement? (between/c 0 100))) nutrient-value-hash/c)]))
(require racket/contract
db
sql
"../db/conn.rkt"
"nutrient.rkt"
"crop.rkt")
(struct crop-requirement (id profile crop-id nutrient-values)
#:transparent
#:guard (λ (id profile crop-id nutrient-values _)
(values id profile (if (sql-null? crop-id) #f crop-id) nutrient-values)))
(define crop-requirement-id? exact-nonnegative-integer?)
(define crop-requirement-or-id/c (or/c crop-requirement? crop-requirement-id?))
(define (->cr-id cr-or-id)
(match cr-or-id
[(? crop-requirement-id? cr-or-id) cr-or-id]
[(crop-requirement id _ _ _) id]))
;; CREATE
(define (create-crop-requirement! profile nutrient-values [crop #f])
(or
(get-crop-requirement #:profile profile)
(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
(query-value (current-conn) (select id #:from crop_requirements #:where (= 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 ([(n v) (in-hash nutrient-values)])
(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))))
;; READ
(define joined
(table-expr-qq (inner-join (inner-join (inner-join (as crop_requirements cr)
(as nutrient_value_sets nvs)
#:on (= nvs.crop_requirement_id cr.id))
(as nutrient_values nv)
#:on (= nv.value_set_id nvs.id))
(as nutrients n)
#:on (= n.id nv.nutrient_id))))
(define (grouped-row->crop-requirement grouped-row)
(match-define (vector cr-id profile crop-id residuals) grouped-row)
(crop-requirement cr-id profile crop-id (residuals->nutrient-value-hash residuals)))
(define (get-crop-requirements)
(define grouped-rows
(query-rows (current-conn)
(select cr.id
cr.profile
cr.crop_id
n.id
n.canonical_name
n.french_name
n.formula
nv.value_ppm
#:from (TableExpr:AST ,joined)
#:order-by cr.id
#:asc)
#:group '#(0 1 2)))
(map grouped-row->crop-requirement grouped-rows))
(define (get-crop-requirement #:id [cr-id #f] #:profile [profile #f] #:crop-id [crop-id #f])
(define where
(cond
[(and cr-id profile crop-id)
(scalar-expr-qq (and (= cr.id ,cr-id) (= cr.profile ,profile) (= cr.crop_id ,crop-id)))]
[cr-id (scalar-expr-qq (= cr.id ,cr-id))]
[profile (scalar-expr-qq (= cr.profile ,profile))]
[crop-id (scalar-expr-qq (= cr.crop_id ,crop-id))]
[else (error 'get-crop-requirement "one of #:id, #:profile or #:crop-id must be provided")]))
(define grouped-rows
(query-rows (current-conn)
(select cr.id
cr.profile
cr.crop_id
n.id
n.canonical_name
n.french_name
n.formula
nv.value_ppm
#:from (TableExpr:AST ,joined)
#:where (ScalarExpr:AST ,where))
#:group '#(0 1 2)))
(match grouped-rows
['() #f]
[(list grouped-row) (grouped-row->crop-requirement grouped-row)]
[many (error 'get-crop-requirement "expected 1 crop requirement, got ~a" (length many))]))
(define (get-crop-requirement-values cr-or-id)
(for/hash ([(nutrient-id canonical-name french-name formula value_ppm)
(in-query (current-conn)
(select n.id
n.canonical_name
n.french_name
n.formula
nv.value_ppm
#:from (TableExpr:AST ,joined)
#:where (= cr.id ,(->cr-id cr-or-id))))])
(values (nutrient nutrient-id canonical-name french-name formula) value_ppm)))
(define (get-crop-requirement-value cr-or-id nutrient)
(query-maybe-value (current-conn)
(select value_ppm
#:from (TableExpr:AST ,joined)
#:where (and (= cr.id ,(->cr-id cr-or-id))
(= nv.nutrient_id ,(nutrient-id nutrient))))))
;; UPDATE
;; DELETE
(define (delete-crop-requirement! cr-or-id)
(query-exec (current-conn) (delete #:from crop_requirements #:where (= id ,(->cr-id cr-or-id)))))
;; Helpers
(define (average-crop-requirement-nutrient-values mix)
(for/fold ([acc (hash)]) ([pair (in-list mix)])
(match-define (cons crop-requirement percentage) pair)
(define weight (/ percentage 100))
(for/fold ([acc acc])
([(nutrient value) (in-hash (crop-requirement-nutrient-values crop-requirement))])
(define contribution (* value weight))
(hash-update acc nutrient (λ (old) (+ old contribution)) 0))))
(module+ test
(require rackunit
rackunit/text-ui
"../db/conn.rkt"
"../db/migrations.rkt"
"../models/nutrient.rkt"
"../models/crop.rkt")
(define requirement-profile "Tomato - Vegetative")
(run-tests
(test-suite "Crop requirement model"
#:before (λ ()
(connect! #:path 'memory)
(migrate-all!)
(create-nutrient! "Nitrogen" "Azote" "N")
(create-nutrient! "Phosphorus" "Phosphore" "P")
(create-nutrient! "Potassium" "Potassium" "K"))
#:after (λ () (disconnect!))
(test-case "Create requirement with profile and values"
(define nitrogen (get-nutrient #:name "Nitrogen"))
(define phosphorus (get-nutrient #:name "Phosphorus"))
(create-crop-requirement! requirement-profile (hash nitrogen 150 phosphorus 50))
(check-equal? (length (get-crop-requirements)) 1)
(define cr (get-crop-requirement #:profile requirement-profile))
(check-true (crop-requirement? cr))
(check-equal? (crop-requirement-profile cr) requirement-profile))
(test-case "Create requirement with associated crop"
(define tomato (create-crop! "Tomato"))
(define nitrogen (get-nutrient #:name "Nitrogen"))
(define cr (create-crop-requirement! "Tomato - Fruiting" (hash nitrogen 200) tomato))
(check-equal? (crop-requirement-crop-id cr) (crop-id tomato)))
(test-case "Check all requirement values"
(define nitrogen (get-nutrient #:name "Nitrogen"))
(define phosphorus (get-nutrient #:name "Phosphorus"))
(define cr (get-crop-requirement #:profile requirement-profile))
(check-= (get-crop-requirement-value cr nitrogen) 150 0)
(check-= (get-crop-requirement-value cr phosphorus) 50 0)
(define crv (crop-requirement-nutrient-values cr))
(check-equal?
(get-crop-requirement-values cr)
crv
"return value of get-crop-requirement-values ≠ crop-requirement-values struct accessor")
(check-equal? (hash-count crv) 2)
(check-= (hash-ref crv nitrogen) 150 0)
(check-= (hash-ref crv phosphorus) 50 0))
(test-case "Get requirement by id"
(define cr (get-crop-requirement #:profile requirement-profile))
(define cr-by-id (get-crop-requirement #:id (crop-requirement-id cr)))
(check-equal? cr cr-by-id))
(test-case "Average crop requirement nutrient values"
(define nitrogen (get-nutrient #:name "Nitrogen"))
(define phosphorus (get-nutrient #:name "Phosphorus"))
(define cr1 (get-crop-requirement #:profile requirement-profile))
(define cr2 (create-crop-requirement! "Lettuce" (hash nitrogen 100 phosphorus 30)))
(define mix (list (cons cr1 60) (cons cr2 40)))
(define avg (average-crop-requirement-nutrient-values mix))
;; 150 * 0.6 + 100 * 0.4 = 90 + 40 = 130
(check-= (hash-ref avg nitrogen) 130 0.01)
;; 50 * 0.6 + 30 * 0.4 = 30 + 12 = 42
(check-= (hash-ref avg phosphorus) 42 0.01))
(test-case "Delete requirement and cascade to requirement values"
(define cr (get-crop-requirement #:profile requirement-profile))
(delete-crop-requirement! cr)
(check-false (get-crop-requirement #:id (crop-requirement-id cr)))
(check-equal? (length (get-crop-requirements))
2
"wrong number of crop requirements were deleted")
(check-true (hash-empty? (get-crop-requirement-values cr)))))))
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