;;======================================================================
;; Copyright 2017, Matthew Welland.
;; 
;; This file is part of Megatest.
;; 
;;     Megatest is free software: you can redistribute it and/or modify
;;     it under the terms of the GNU General Public License as published by
;;     the Free Software Foundation, either version 3 of the License, or
;;     (at your option) any later version.
;; 
;;     Megatest is distributed in the hope that it will be useful,
;;     but WITHOUT ANY WARRANTY; without even the implied warranty of
;;     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;     GNU General Public License for more details.
;; 
;;     You should have received a copy of the GNU General Public License
;;     along with Megatest.  If not, see <http://www.gnu.org/licenses/>.

;;======================================================================

(declare (unit dbmod))
(declare (uses commonmod))
;; (include "debugprint.scm")

(module dbmod
	*
	
(import scheme
	chicken
	ports
	s11n
	z3
	
	data-structures
	extras
	(prefix base64 base64:)
	message-digest
	regex

	commonmod ;; debugprint
	)

(import (prefix sqlite3 sqlite3:)
	posix typed-records srfi-18
	srfi-69)

(define (db:run-id->dbname run-id)
  (cond
   ((number? run-id)(conc run-id ".db"))
   ((not run-id)    "main.db")
   (else            run-id)))

;; NOTE: Can remove the regex and base64 encoding for zmq
(define (db:obj->string obj #!key (transport 'http))
  (case transport
    ;; ((fs) obj)
    ((http fs)
     (string-substitute
      (regexp "=") "_"
      (base64:base64-encode 
       (z3:encode-buffer
	(with-output-to-string
	  (lambda ()(serialize obj))))) ;; BB: serialize - this is what causes problems between different builds of megatest communicating.  serialize is sensitive to binary image of mtest.
      #t))
    ((zmq nmsg)(with-output-to-string (lambda ()(serialize obj))))
    (else obj))) ;; rpc

(define (db:string->obj msg #!key (transport 'http))
  (case transport
    ;; ((fs) msg)
    ((http fs)
     (if (string? msg)
	 (with-input-from-string 
	     (z3:decode-buffer
	      (base64:base64-decode
	       (string-substitute 
		(regexp "_") "=" msg #t)))
	   (lambda ()(deserialize)))
	 (begin
	   (debug:print-error 0 *default-log-port* "reception failed. Received \"" msg "\" but cannot translate it.")
           (print-call-chain (current-error-port))
	   msg))) ;; crude reply for when things go awry
    ((zmq nmsg)(with-input-from-string msg (lambda ()(deserialize))))
    (else msg))) ;; rpc


;;======================================================================
;; hash of hashs
;;======================================================================


(define (db:hoh-set! dat key1 key2 val)
  (let* ((subhash (hash-table-ref/default dat key1 #f)))
    (if subhash
	(hash-table-set! subhash key2 val)
	(begin
	  (hash-table-set! dat key1 (make-hash-table))
	  (db:hoh-set! dat key1 key2 val)))))

(define (db:hoh-get dat key1 key2)
  (let* ((subhash (hash-table-ref/default dat key1 #f)))
    (and subhash
	 (hash-table-ref/default subhash key2 #f))))

)
