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#lang racket
(provide nutrient-target
nutrient-target?
nutrient-target-id
(rename-out [nutrient-target-effective-on nutrient-target-date]
[nutrient-target-nutrient-values nutrient-target-values])
(contract-out [create-nutrient-target! (-> string? nutrient-value-hash/c 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? nutrient-value-hash/c)]
[get-nutrient-target-value (-> nutrient-target? nutrient? number?)]
[get-latest-nutrient-target-value (-> nutrient? (or/c number? #f))]
[get-latest-nutrient-target-hash (-> (hash/c nutrient? number?))]
[delete-nutrient-target! (-> nutrient-target? void?)]))
(require racket/contract
db
sql
"../db/conn.rkt"
"nutrient.rkt")
(struct nutrient-target (id effective-on nutrient-values)
#:transparent
#:property prop:custom-write
(λ (v out _)
(fprintf out "Target #~a on ~a\n" (nutrient-target-id v) (nutrient-target-effective-on v))
(for ([(n v) (in-hash (nutrient-target-nutrient-values v))])
(fprintf out
"~a ~a\n"
(~a (nutrient-name n) #:min-width 14)
(~a v #:max-width 6 #:align 'right)))))
;; 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 ([(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-nutrient-target #:effective-on effective-on))))
;; READ
(define joined
(table-expr-qq (inner-join (inner-join (inner-join (as nutrient_targets nt)
(as nutrient_value_sets nvs)
#:on (= nvs.nutrient_target_id nt.id))
(as nutrient_values nv)
#:on (= nv.value_set_id nvs.id))
(as nutrients n)
#:on (= n.id nv.nutrient_id))))
(define (grouped-row->nutrient-target row)
(match-define (vector nt-id effective-on residuals) row)
(nutrient-target nt-id effective-on (residuals->nutrient-value-hash residuals)))
(define (get-nutrient-targets)
(for/list ([grouped-row (in-query (current-conn)
(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)
#:group '#(0 1))])
(grouped-row->nutrient-target grouped-row)))
(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))]
[else (error 'get-nutrient-target "either #:id or #:effective-on must be provided")]))
(define grouped-rows
(query-rows (current-conn)
(select nt.id
nt.effective_on
n.id
n.canonical_name
n.formula
nv.value_ppm
#:from (TableExpr:AST ,joined)
#:where (ScalarExpr:AST ,where)
#:order-by nt.effective_on
#:desc)
#:group '#(0 1)))
(match grouped-rows
['() #f]
[(list row) (grouped-row->nutrient-target row)]
[many (error 'get-nutrient-target "expected 1 nutrient target, got ~a" (length many))]))
(define (get-nutrient-target-values nutrient-target)
(for/hash ([(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 (= nt.id ,(nutrient-target-id nutrient-target))))])
(values (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 (= nt.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)))
(define (get-latest-nutrient-target-hash)
(for/hash ([(n-id n-name n-formula residual-rows) (in-query (current-conn)
(select n.id
n.canonical_name
n.formula
nt.effective_on
nv.value_ppm
#:from (TableExpr:AST ,joined)
#:order-by nt.effective_on
#:desc)
#:group '(#(0 1 2)))])
;; residual-rows is a non-empty list of vectors: #(effective_on value_ppm)
(match-define (vector _effective-on value-ppm) (first residual-rows))
(values (nutrient n-id n-name n-formula) value-ppm)))
;; 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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