;; TODO
;;  Concept of order num incremented with each page access
;;     if a branch is taken then a new session would need to be created
;;

;; make-vector-record session session dbtype dbinit conn params path-params session-key session-id domain toppage page curr-page content-type page-type sroot twikidir pagedat alt-page-dat pagevars pagevars-before sessionvars sessionvars-before globalvars globalvars-before logpt formdat request-method session-cookie curr-err log-port logfile seen-pages page-dir-style debugmode
(define (make-sdat)(make-vector 34))
(define (sdat-get-dbtype               vec)    (vector-ref  vec 0))
(define (sdat-get-dbinit               vec)    (vector-ref  vec 1))
(define (sdat-get-conn                 vec)    (vector-ref  vec 2))
(define (sdat-get-pgconn               vec)    (vector-ref (vector-ref vec 2) 1))
(define (sdat-get-params               vec)    (vector-ref  vec 3))
(define (sdat-get-path-params          vec)    (vector-ref  vec 4))
(define (sdat-get-session-key          vec)    (vector-ref  vec 5))

(define (sdat-get-session-cookie       vec)    (vector-ref  vec 26))
(define (sdat-get-curr-err             vec)    (vector-ref  vec 27))
(define (sdat-get-log-port             vec)    (vector-ref  vec 28))
(define (sdat-get-logfile              vec)    (vector-ref  vec 29))
(define (sdat-get-seen-pages           vec)    (vector-ref  vec 30))
(define (sdat-get-page-dir-style       vec)    (vector-ref  vec 31))
(define (sdat-get-debugmode            vec)    (vector-ref  vec 32))
(define (sdat-get-shared-hash          vec)    (vector-ref  vec 33))

(define (session:get-shared vec varname)
  (hash-table-ref/default (vector-ref vec 33) varname #f))

(define (sdat-set-dbtype!              vec val)(vector-set! vec 0 val))
(define (sdat-set-dbinit!              vec val)(vector-set! vec 1 val))
(define (sdat-set-conn!                vec val)(vector-set! vec 2 val))
(define (sdat-set-params!              vec val)(vector-set! vec 3 val))
(define (sdat-set-path-params!         vec val)(vector-set! vec 4 val))
(define (sdat-set-session-key!         vec val)(vector-set! vec 5 val))
(define (sdat-set-session-id!          vec val)(vector-set! vec 6 val))

(define (sdat-set-session-cookie!      vec val)(vector-set! vec 26 val))
(define (sdat-set-curr-err!            vec val)(vector-set! vec 27 val))
(define (sdat-set-log-port!            vec val)(vector-set! vec 28 val))
(define (sdat-set-logfile!             vec val)(vector-set! vec 29 val))
(define (sdat-set-seen-pages!          vec val)(vector-set! vec 30 val))
(define (sdat-set-page-dir-style!      vec val)(vector-set! vec 31 val))
(define (sdat-set-debugmode!           vec val)(vector-set! vec 32 val))
(define (sdat-set-shared-hash!         vec val)(vector-set! vec 33 val))

(define (session:set-shared! vec varname val)
  (hash-table-set! (vector-ref vec 33) varname val))

;; The global session
(define s:session (make-sdat))

;; SPLIT INTO STRAIGHT FORWARD INIT AND COMPLEX INIT
(define (session:initialize self)
  (sdat-set-dbtype! self      'pg)

    (if debugmode (sdat-set-debugmode! self debugmode))
    (sdat-set-page-dir-style! self page-dir)
    ;; (print "configdat: ")(pp configdat)
    (if debugmode
	(session:log self "sroot: " sroot " logfile: " logfile " dbtype: " dbtype 
		     " dbinit: " dbinit " domain: " domain " page-dir-style: " page-dir))
    )
  (sdat-set-shared-hash! self (make-hash-table))
  )

;; Used for the strangely inconsistent handling of the config file. A better way is needed.
;;
;;   (let ((dbtype (sdat-get-dbtype self)))
;;     (print "dbtype: " dbtype)
;;     (sdat-set-dbtype! self (eval dbtype))))

(define (session:setup self)
  (let ((dbtype    (sdat-get-dbtype self))
	(debugmode (sdat-get-debugmode self))

	    (if (file-exists? dbfname)
		(begin
		  ;; (session:log self "setting dbexists to #t")
		  (set! dbexists #t))))
	  (if debugmode (session:log self "INFO: setting up for pg db access to account info " dbinit)))
      (if debugmode (session:log self "dbtype: " dbtype " dbfname: " dbfname " dbexists: " dbexists)))
    (sdat-set-conn! self (dbi:open dbtype dbinit))
    (set! *db* (sdat-get-conn self))
    (if (and (not dbexists)(eq? dbtype 'sqlite3))
 	(begin
	  (print "WARNING: Setting up session db with sqlite3")
	  (session:setup-db self)))
    (session:process-url-path self)
    (session:setup-session-key self)
    ;; capture stdin if this is a POST

  (let* ((dir-style    (sdat-get-page-dir-style self));; (equal? (sdat-get-page-dir-style self) "onedir")) ;; flag #t for onedir, #f for old style
	 (dir          (string-append (sdat-get-sroot self) 
				      (if dir-style 
					  (conc "/pages/")
					  (conc "/pages/" page)))))
    (case dir-style
      ;; NB// Stored always loads both control and view
      ((stored)
       ((eval (string->symbol (conc "pages:" page))) 
	self                         ;; the session
	(sdat-get-conn self)         ;; the db connection
	(sdat-get-shared-hash self)  ;; a shared hash table for passing data to/from page calls
	))
      ((flat)   
       (load (conc dir page ".so"))
        ((eval (string->symbol (conc "pages:" page))) 
	self                         ;; the session
	(sdat-get-conn self)         ;; the db connection
	(sdat-get-shared-hash self)  ;; a shared hash table for passing data to/from page calls
	))
       ;; first the control
       ;; (let ((control-file (conc "pages/" page "_ctrl.scm"))
       ;;       (view-file    (conc "pages/" page "_view.scm")))
       ;;   (if (and (file-exists? control-file)
       ;;  	  (not (eq? parts 'view)))
       ;;       (begin
       ;;         (session:set-called! self page)
       ;;         (load control-file)))
       ;;   (if (file-exists? view-file)
       ;;       (if (not (eq? parts 'control))
       ;;  	 (session:process-file view-file))
       ;;       (list "<p>Page not found " page " </p>")))

      ((dir) "ERROR:  dir style not yet re-implemented")
      (else
       (list "ERROR: page-dir-style must be stored, dir or flat, got " dir-style)))))

(define (session:call self page parts)
  (session:call-parts self page 'both))

;; (define (session:load-model self model)