;; (declare (uses misc-stml))
(use regex)

;; The (usually global) sdat contains everything about the session
;;
(defstruct sdat
  ;; database
  (dbtype 'pg)
  (dbinit #f)
  (conn   #f)
  ;; page info
  (page "home")
  (page-type 'html)
  (toppage "index")
  (curr-page    "home")
  (content-type "Content-type: text/html; charset=iso-8859-1\n\n")
  ;; forms and variables
  (formdat      #f)
  (params '())
  (path-params '())
  (session-key #f)
  (pagedat     '())

  (alt-page-dat #f)

  (session-cookie #f)
  (pagevars        (make-hash-table))
  (pagevars-before (make-hash-table))
  (sessionvars     (make-hash-table))
  (sessionvars-before (make-hash-table))
  (globalvars      (make-hash-table))
  (globalvars-before (make-hash-table))
  ;; ports and log file
  (curr-err       #f)
  (log-port       (current-error-port))
  (logfile        "/tmp/stml.log")
  (seen-pages     '())
  (page-dir-style  #t)
  (debug-mode      #f)
  (session-id      #f)






  (request-method  #f)
  (domain          "localhost")
  (twikidir        #f)
  (script          #f)
  (force-ssl       #f)
  (shared-hash     (make-hash-table))
  ;; paths
  (sroot         "./")
  (models        #f)
  (views         #f)
)

(define (sdat-set-if session configdat var settor)
  (let ((val (s:find-param var configdat)))
    (if val (settor session val))))

(define (session:initialize session #!optional (configf #f))
  ;; (let* ((rawconfigdat (session:read-config session configf))
  ;;	 (configdat (if rawconfigdat (eval rawconfigdat) '())))
    ;; (sdat-set-if session configdat 'sroot     sdat-root-set!)
    ;; (sdat-set-if session configdat 'logfile   sdat-logfile-set!)
    ;; (sdat-set-if session configdat 'dbtype    sdat-dbtype-set!)
    ;; (sdat-set-if session configdat 'dbinit    sdat-dbinit-set!)
    ;; (sdat-set-if session configdat 'domain    sdat-domain-set!)
    ;; (sdat-set-if session configdat 'twikidir  sdat-twikidir-set!)
    ;; (sdat-set-if session configdat 'page-dir-style sdat-page-set!)
    ;; (sdat-set-if session configdat 'sroot sdat-root-set!)
    ;; (sdat-set-if session configdat 'sroot sdat-root-set!)
    ;; (sdat-set-if session configdat 'sroot sdat-root-set!)
    ;; following are set always from config
    ;; (sdat-page-dir-style-set! session (s:find-param 'page-dir-style configdat))
  (let* ((rawconfigdat (session:read-config session configf))
	 (configdat (if rawconfigdat (eval rawconfigdat) '()))
	 (sroot     (s:find-param 'sroot    configdat))
	 (models    (s:find-param 'models   configdat))
	 (views     (s:find-param 'views    configdat))
	 (logfile   (s:find-param 'logfile  configdat))
	 (dbtype    (s:find-param 'dbtype   configdat))
	 (dbinit    (s:find-param 'dbinit   configdat))
	 (domain    (s:find-param 'domain   configdat))
	 (twikidir  (s:find-param 'twikidir configdat))
	 (page-dir  (s:find-param 'page-dir-style configdat))
	 (debugmode (s:find-param 'debugmode configdat))
         (script    (s:find-param 'script    configdat))
	 (force-ssl (s:find-param 'force-ssl configdat)))
    (if sroot    (sdat-sroot-set!      session sroot))
    (if models   (sdat-models-set!     session models))
    (if views    (sdat-views-set!      session views))
    (if logfile  (sdat-logfile-set!    session logfile))
    (if dbtype   (sdat-dbtype-set!     session dbtype))
    (if dbinit   (sdat-dbinit-set!     session dbinit))
    (if domain   (sdat-domain-set!     session domain))
    (if twikidir (sdat-twikidir-set!   session twikidir))
    (if debugmode (sdat-debug-mode-set! session debugmode))
    (if script    (sdat-script-set!    session script))

;; get-input else, get-param else #f
;;
(define (s:get-inp key . params)
  (or (apply s:get-input key params)
      (apply s:get-param key params)))

(define (s:load-model model)
  (session:load-model s:session model))

(define (s:model-path)
  (session:model-path s:session))

;; share data between pages calls. NOTE: This is not persistent
;; between cgi calls. Use sessionvars for that.
;;
(define (s:shared-hash)
  (sdat-shared-hash s:session))

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

(define (session:setup self #!optional (configf #f))
  (session:initialize self configf)
  (let ((dbtype    (sdat-dbtype self))
	(debugmode (sdat-debug-mode self))
	(dbinit    (eval (sdat-dbinit self)))
	(dbexists  #f))
    (let ((dbfname (alist-ref 'dbname dbinit)))
      (if debugmode (session:log self "session:setup dbfname=" dbfname ", dbtype=" dbtype ", dbinit=" dbinit))
      (if (eq? dbtype 'sqlite3)

      ((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)
  (let* ((mpath     (session:model-path self))
	 (model.scm (string-append mpath "/" model ".scm"))
	 (model.so  (string-append mpath "/" model ".so")))
    (if (file-exists? model.so)
	(load model.so)
	(if (file-exists? model.scm)
	    (load model.scm)
	    (s:log "ERROR: model " model.scm " not found")))))

(define (session:model-path self)
  (or (sdat-models self)
      (string-append (sdat-sroot self) "/models/")))

(define (session:pp-formdat self)
  (let ((dat (formdat:all->strings (sdat-formdat self))))
    (string-intersperse dat "<br> ")))

(define (session:param->string params)
  ;; (err:log "params=" params)

  (session:del! s:session "*sessionvars*" key))

(define s:session-var-delete! s:session-var-del!)

;; utility to get all vars as hash table
(define (s:session-get-sessionvars)
  (sdat-sessionvars s:session))

;;======================================================================
;; Sugar
;;======================================================================
;;
;; (require 'syntax-case)
;; 
;; (define-syntax s:if-param
;;   (syntax-rules ()
;;     [(_ s x)   (if (s:get s) x (s:comment "s:if not"))]
;;     [(_ s x y) (if (s:get s) x y)]))
;; ;; 
;; (define-syntax s:if-test
;;   (syntax-rules ()
;;     [(_ s x) (if   (string=? "yep" s)   x (list "s:if not"))]
;;     [(_ s x y) (if (string=? "yep" s) x y)]))

;; Some of these routines use:
;;
;;     http://www.cs.toronto.edu/~gfb/scheme/simple-macros.html
;;
;; Syntax for defining macros in a simple style similar to function definiton,
;;  when there is a single pattern for the argument list and there are no keywords.
;;
;; (define-simple-syntax (name arg ...) body ...)
;;

(define-syntax define-simple-syntax
  (syntax-rules ()
    ((_ (name arg ...) body ...)
     (define-syntax name (syntax-rules () ((name arg ...) (begin body ...)))))))

;;======================================================================
;; syntatic sugar items
;;======================================================================

;; We often seem to want to include stuff if a conditional is met
;; otherwise not include it. This routine makes that slightly cleaner
;; since using a pure if results in #<undefined> objects. (admittedly they 
;; should be ignored but this is slightly cleaner I think). 
;;
;; NOTE: This has to be a macro or the true clause will be evaluated 
;; whether "a" is true or false

;; If a is true return b, else return '()
(define-simple-syntax (s:if a b)
  (if a b '()))


;; Using the Simple-Syntax System
;; 
;; The syntax for defining macros in this system is similar to that for defining functions. In fact if the macro has a fixed number of arguments the syntax is identical. For example:
;; 
;;   ; Define a simple macro to add a value to a variable.
;;   ;
;;   (define-simple-syntax (+= variable value)
;;     (set! variable (+ variable value)))
;; 
;;   ; Use it.
;;   ;
;;   (define v 2)
;;   (+= v 7)
;;   v ; => 9
;; 
;; For a fixed number of arguments followed by an unknown number of arguments we use ... after a single argument to represent the unknown number (possibly zero) of arguments. For example, let's revise our definition of += to allow zero or more values to be added:
;; 
;;   ; Define a simple macro to add a zero or more values to a variable
;;   ;
;;   (define-simple-syntax (+= variable value ...)
;;     (set! variable (+ variable value ...)))
;; 
;;   ; Use it
;;   ;
;;   (define v 2)
;;   (+= v 7)
;;   v ; => 9
;;   (+= v 3 4)
;;   v ; => 16
;;   (+= v)
;;   v ; => 16
;; 

(define-simple-syntax (s:if-param varname first ...)
  (if (s:get varname)
      first
      ...))

(define-simple-syntax (s:if-sessionvar varname first ...)
  (if (s:session-var-get varname)
      first
      ...))

;; (define-macro (s:if-param varname ...)
;;   (match dat
;; 	 (()    '())
;; 	 ((a)    `(if (s:get ,varname) ,a '()))
;; 	 ((a b)  `(if (s:get ,varname) ,a ,b))))
;; 
;; (define-macro (s:if-sessionvar varname . dat)
;;   (match dat
;; 	 (()    '())
;; 	 ((a)    `(if (s:session-var-get ,varname) ,a '()))
;; 	 ((a b)  `(if (s:session-var-get ,varname) ,a ,b))))
;; 

)