Split out mbase-stats into separate query module.

src/mbase-query.scm

@@ -0,0 +1,92 @@
+;;
+;; mbase-query.scm
+;;
+;; Queries of various mbase derived attributes.
+;;
+;; ISC License
+;;
+;; Copyright 2023-2025 Brmlab, z.s.
+;; Dominik Pantůček <dominik.pantucek@trustica.cz>
+;;
+;; Permission to use, copy, modify, and/or distribute this software
+;; for any purpose with or without fee is hereby granted, provided
+;; that the above copyright notice and this permission notice appear
+;; in all copies.
+;; 
+;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+;;
+
+(declare (unit mbase-query))
+
+(module
+    mbase-query
+    (
+     mbase-info
+     mbase-stats
+     )
+
+  (import scheme
+	  (chicken base)
+	  srfi-1
+	  mbase
+	  brmember
+	  util-bst-ldict
+	  primes
+	  cal-period
+	  cal-month)
+
+  (define (members-base-oldest-month mb)
+    (make-cal-month 2015 1))
+
+  ;; Returns dictionary with statistics about the members base.
+  (define (mbase-info mb-arg)
+    (let* ((members (find-members-by-predicate mb-arg brmember-usable?))
+	   (di0 (make-ldict))
+	   (di1 (ldict-set di0 'invalid
+			   (filter (compose not is-4digit-prime? brmember-id) members)))
+	   (di2 (ldict-set di1 'active
+			   (filter brmember-active? members)))
+	   (di3 (ldict-set di2 'suspended
+			   (filter brmember-suspended? members)))
+	   (di4 (ldict-set di3 'students
+			   (filter brmember-student? members)))
+	   (di5 (ldict-set di4 'destroyed
+			   (filter brmember-destroyed? members)))
+	   (di6 (ldict-set di5 'month (*current-month*)))
+	   (di7 (ldict-set di6 'total members))
+	   (di8 (ldict-set di7 'problems
+			   (find-members-by-predicate mb-arg brmember-has-problems?)))
+	   ;; add expected income
+	   ;; add total balance of all members (including destroyed)
+	   ;; add total balance of all active members (-only-active -like)
+	   ;; add average age of active members
+
+	   )
+      di8))
+
+  ;; Returns a list two lists: keys, data.
+  ;; Each data record contains values for all keys.
+  (define (mbase-stats mb)
+    (let ((keys '(month total active suspended students destroyed invalid)))
+      (let mloop ((data '())
+		  (month (members-base-oldest-month mb)))
+	(if (cal-month<=? month (*current-month*))
+	    (let ((bi (with-current-month month
+					  (mbase-info mb))))
+	      (let kloop ((row (list (ldict-ref bi 'month)))
+			  (keys (cdr keys)))
+		(if (null? keys)
+		    (mloop (cons (reverse row) data)
+			   (cal-month-add month 1))
+		    (kloop (cons (length (ldict-ref bi (car keys))) row)
+			   (cdr keys)))))
+	    (list keys (reverse data))))))
+
+  )