;;; http server in the Scheme Shell	-*- Scheme -*-
;;; Mike Sperber <sperber@informatik.uni-tuebingen.de>

;;; This package manages options to the http server as an abstract
;;; data type.

(define-record-type httpd-options :httpd-options
  (really-make-httpd-options port
			     root-directory
			     fqdn
			     reported-port
			     path-handler
			     server-admin
			     simultaneous-requests
			     logfile
			     syslog?)
  httpd-options?
  (port httpd-options-port
	set-httpd-options-port!)
  (root-directory httpd-options-root-directory
		  set-httpd-options-root-directory!)
  (fqdn httpd-options-fqdn
	set-httpd-options-fqdn!)
  (reported-port httpd-options-reported-port
		 set-httpd-options-reported-port!)
  (path-handler httpd-options-path-handler
		set-httpd-options-path-handler!)
  (server-admin httpd-options-server-admin
		set-httpd-options-server-admin!)
  (simultaneous-requests httpd-options-simultaneous-requests
			 set-httpd-options-simultaneous-requests!)
  (logfile httpd-options-logfile set-httpd-options-logfile!)
  (syslog? httpd-options-syslog? set-httpd-options-syslog?!))

; default httpd-options generation
(define (make-httpd-options)
  (really-make-httpd-options 80		; port
			     "/"	; root-directory
			     #f		; fqdn
			     #f		; reported-port
			     #f		; path-handler
			     #f         ; server-admin
			     #f	        ; simultaneous-requests
			     "/logfile.log"  ; name of the logfile
                            ; string: filename of logfile (directory must exist)
                            ; output-port: log to this port (e.g. (current-error-port))
                            ; #f: no logging
			     #t))      ; Do syslogging?

; creates a copy of a given httpd-option

(define (copy-httpd-options options)
  (let ((new-options (make-httpd-options)))
    (set-httpd-options-port! new-options
			     (httpd-options-port options))
    (set-httpd-options-root-directory! new-options
				       (httpd-options-root-directory options))
    (set-httpd-options-fqdn! new-options
			     (httpd-options-fqdn options))
    (set-httpd-options-reported-port! new-options
				      (httpd-options-reported-port options))
    (set-httpd-options-path-handler! new-options
				     (httpd-options-path-handler options))
    (set-httpd-options-server-admin! new-options
				     (httpd-options-server-admin options))
    (set-httpd-options-simultaneous-requests!
     new-options
     (httpd-options-simultaneous-requests options))
    (set-httpd-options-logfile! new-options (httpd-options-logfile options))
    (set-httpd-options-syslog?! new-options (httpd-options-syslog? options))
    new-options))

; (make-httpd-options-transformer set-option!) -> lambda (new-value [httpd-option])
; creates a transformer for httpd-options
; the returned procedure is called with the new value for the option
; and optionally with the httpd-option to change
(define (make-httpd-options-transformer set-option!)
  (lambda (new-value . stuff)
    (let ((new-options (if (not (null? stuff))
			   (copy-httpd-options (car stuff))
			   (make-httpd-options))))
      (set-option! new-options new-value)
      new-options)))

; several transformers for port, root-directory, etc.
(define with-port
  (make-httpd-options-transformer set-httpd-options-port!))
(define with-root-directory
  (make-httpd-options-transformer set-httpd-options-root-directory!))
(define with-fqdn
  (make-httpd-options-transformer set-httpd-options-fqdn!))
(define with-reported-port
  (make-httpd-options-transformer set-httpd-options-reported-port!))
(define with-path-handler
  (make-httpd-options-transformer set-httpd-options-path-handler!))
(define with-server-admin
  (make-httpd-options-transformer set-httpd-options-server-admin!))
(define with-simultaneous-requests
  (make-httpd-options-transformer set-httpd-options-simultaneous-requests!))
(define with-logfile
  (make-httpd-options-transformer set-httpd-options-logfile!))
(define with-syslog?
  (make-httpd-options-transformer set-httpd-options-syslog?!))

;(define (with-httpd-options options-alist)
;  (let ((new-options (make-httpd-options)))
;    (let loop ((options-alist options-alist))
;      (if (null? options-alist)
;	  new-options
;	  (begin
;	    (case (caar options-alist)
;	      (('port)
;	       (set-httpd-options-port! new-options (cdar options-alist)))
;	      (('root-directory)
;	       (set-httpd-options-root-directory! new-options (cdar options-alist)))
;	      (('fqdn)
;	       (set-httpd-options-fqdn! new-options (cdar options-alist)))
;	      (('reported-port)
;	       (set-httpd-options-reported-port! new-options (cdar options-alist)))
;	      (('path-handler)
;	       (set-httpd-options-path-handler! new-options (cdar options-alist)))
;	      (('server-admin)
;	       (set-httpd-options-server-admin! new-options (cdar options-alist)))
;	      (('simultaneous-requests)
;	       (set-httpd-options-simultaneous-requests! new-options (cdar options-alist)))
;	      (('logfile)
;	       (set-httpd-options-logfile! new-options (cdar options-alist)))
;	      (('syslog?)
;	       (set-httpd-options-syslog?! new-options (cdar options-alist)))
;	      (else
;	       (begin
;		 (format (current-error-port) 
;			 "[httpd] Warning: Ignoring unknown option ~A."
;			 (cdar options-alist)))))
;	    (loop (cdr options-alist)))))))