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#lang racket
(provide
;; Struct definitions
nutrient-target
nutrient-target?
nutrient-target-id
(rename-out
[nutrient-target-effective-on nutrient-target-date]
[nutrient-target-nutrient-values nutrient-target-values])
;; 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? (or/c number? #f))]
[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 nutrient-values) #:transparent)
;; CREATE
(define (create-nutrient-target! effective-on nutrient-values)
(or (get-nutrient-target #:effective-on effective-on)
(with-tx
(query-exec (current-conn)
(insert #:into nutrient_targets
#:set [effective_on ,effective-on]))
(define nt-id (query-value (current-conn)
(select id
#:from nutrient_targets
#:where (= effective_on ,effective-on))))
(query-exec (current-conn)
(insert #:into nutrient_value_sets
#:set [nutrient_target_id ,nt-id]))
(define nvs-id (query-value (current-conn)
(select id
#:from nutrient_value_sets
#:where (= nutrient_target_id ,nt-id))))
(for ([nv nutrient-values])
(match-define (cons n v) nv)
(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))))
;; READ
(struct acc (effective-on pairs) #:transparent)
(define joined
(table-expr-qq
(inner-join
(inner-join
(inner-join
(as nutrient_targets nt)
(as nutrient_value_sets nvs)
#:on (= nvs.nutrient_measurement_id nt.id))
(as nutrient_values nv)
#:on (= nv.value_set_id nvs.id))
(as nutrients n)
#:on (= n.id nv.nutrient_id))))
(define (get-nutrient-targets)
(define query (select nt.id nt.effective_on
n.id n.canonical_name n.formula
nv.value_ppm
#:from (TableExpr:AST ,joined)
#:order-by nt.effective_on #:desc))
(define rows (query-rows (current-conn) query))
(define by-id
(for/fold ([h (hash)]) ([row (in-list rows)])
(match-define (vector nt-id effective-on n-id n-name n-formula value-ppm) row)
(define nv-pair (cons (nutrient n-id n-name n-formula) value-ppm))
(hash-update h nt-id
(λ (old-acc)
(acc (acc-effective-on old-acc)
(cons nv-pair (acc-pairs old-acc))))
(λ ()
(acc effective-on
(list nv-pair))))))
(for/list ([(id a) (in-hash by-id)])
(nutrient-target id
(acc-effective-on a)
(reverse (acc-pairs a)))))
(define (get-nutrient-target #:id [nt-id #f]
#:effective-on [effective-on #f])
(define where
(cond
[(and nt-id effective-on)
(scalar-expr-qq (and (= nt.id ,nt-id)
(= nt.effective_on ,effective-on)))]
[nt-id
(scalar-expr-qq (= nt.id ,nt-id))]
[effective-on
(scalar-expr-qq (= nt.effective_on ,effective-on))]))
(define query (select nt.id nt.effective_on
n.id n.canonical_name n.formula
nv.value_ppm
#:from (TableExpr:AST ,joined)
#:where (ScalarExpr:AST ,where)))
(define rows (query-rows (current-conn) query))
(cond
[(null? rows) #f]
[else
;; Fold all nutrient rows belonging to the single target into one struct
(define the-id #f)
(define A #f)
(for ([row (in-list rows)])
(match-define (vector nt-id effective-on n-id n-name n-formula value-ppm) row)
(unless the-id (set! the-id nt-id))
(define nv-pair (cons (nutrient n-id n-name n-formula) value-ppm))
(set! A (if A
(acc (acc-effective-on A)
(cons nv-pair (acc-pairs A)))
(acc effective-on (list nv-pair)))))
(and A
(nutrient-target the-id
(acc-effective-on A)
(reverse (acc-pairs A))))]))
(define (get-nutrient-target-values nutrient-target)
(for/list ([(nutrient-id name formula value_ppm)
(in-query (current-conn)
(select n.id n.canonical_name n.formula nv.value_ppm
#:from (TableExpr:AST ,joined)
#:where (= nm.id ,(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)
(select value_ppm
#:from (TableExpr:AST ,joined)
#:where (and (= nm.id ,(nutrient-target-id nutrient-target))
(= nv.nutrient_id ,(nutrient-id nutrient))))))
(define (get-latest-nutrient-target-value nutrient)
(query-maybe-value (current-conn)
(select value_ppm
#:from (TableExpr:AST ,joined)
#:where (= nv.nutrient_id ,(nutrient-id nutrient))
#:order-by nt.effective_on #:desc
#:limit 1)))
;; 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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