#!/usr/bin/env guile \
-e main -s
!#
;; Minimal web server can be started from command line. Current example routes:
;;
;;    localhost:8080/
;;

(use-modules
 (json)
 (ice-9 match)
 (ice-9 format)
 (ice-9 iconv)
 (ice-9 receive)
 (ice-9 string-fun)
 ;; (ice-9 debugger)
 ;; (ice-9 breakpoints)
 ;; (ice-9 source)
 (srfi srfi-1)
 (srfi srfi-11) ; let-values
 (srfi srfi-19) ; time
 (srfi srfi-26)
 (rnrs io ports) ; bytevector-all
 (web http)
 (web client)
 (web request)
 (web response)
 (web uri)
 (fibers web server)
 (gn cache memoize)
 (web gn-uri)
 (gn db sparql)
 (gn data species)
 (gn data group)
 (web sxml)
 (web view view)
 (web view doc))


(define info `(
  ("name" . "GeneNetwork REST API")
  ("version" . ,get-version)
  ("comment" . "This is the official REST API for the GeneNetwork service hosted at https://genenetwork.org/")
  ("license" . (("source code (unless otherwise specified)" . "Affero GNU Public License 3.0 (AGPL3)")
                ("data (unless otherwise specified)" . "Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)")))
  ("note" . "This is work in progress (WIP). Note that the final base URL will change! The temporary prefix is:")
  ("prefix" . ,(prefix))
  ("links". (("species" . ,(mk-meta "species"))))))

(define info-meta `(
   ("doc" . ,(mk-html "info"))
   ("API" .
    ((,(mk-url "species")."Get a list of all species")
     (,(mk-url "mouse")."Get information on mouse")
     (,(mk-url "datasets")."Get a list of datasets")))))


(define (get-id-data id)
  "Get data based on identifier id. If it is a taxon return the taxon data,
otherwise search for set/group data"
  (let ([taxoninfo (get-expanded-taxon-data id)])
    (if taxoninfo
        taxoninfo
        (cdr (get-group-data id)))))

;; ---- REST API web server handler

(define (not-found2 request)
  (values (build-response #:code 404)
          (string-append "Resource X not found: "
                         (uri->string (request-uri request)))))

(define (not-found uri)
  (list (build-response #:code 404)
        (string-append "Resource not found: " (uri->string uri))))


(define file-mime-types
  '(("css" . (text/css))
    ("js"  . (text/javascript))
    ("svg" . (image/svg+xml))
    ("png" . (image/png))
    ("gif" . (image/gif))
    ("jpg" . (image/jpg))
    ("woff" . (application/font-woff))
    ("ttf"  . (application/octet-stream))
    ("html" . (text/html))))

(define (file-extension file-name)
  (last (string-split file-name #\.)))

(define* (render-static-image file-name #:key (extra-headers '()))
  (let* ((stat (stat file-name #f))
         (modified (and stat
                        (make-time time-utc 0 (stat:mtime stat)))))
  (list `((content-type . ,(assoc-ref file-mime-types
                                      (file-extension file-name)))
          (last-modified . ,(time-utc->date modified)))
        (call-with-input-file file-name get-bytevector-all))))

(define* (render-doc path page #:optional rec #:key (extra-headers '()))
  (list (append extra-headers
                '((content-type . (text/html))))
        (lambda (port)
          (sxml->html (view-doc path page rec) port))))

(define* (render-brand path #:optional rec #:key (extra-headers '()))
  (list (append extra-headers
                '((content-type . (text/html))))
        (lambda (port)
          (sxml->html (view-brand path) port))))

(define (render-json json)
  (list '((content-type . (application/json)))
        (lambda (port)
          (scm->json json port))))

(define (render-json-string2 json)
  (list '((content-type . (text/plain)))
	(lambda (port)
	  (format port "~a" "foo"))))

(define (controller request body)
  (match-lambda
    (('GET)
     (render-json info))
    (('GET "version")
     (render-json get-version))
    (('GET "static" "images" fn)
     (render-static-image (string-append "static/images/" fn)))
    (('GET "home" path)
     (render-brand path))
    (('GET "doc" "species.html")
     (render-doc "doc" "species.html" (get-species-meta)))
    (('GET "doc" taxon)
     (match (string->list taxon)
       [(name ... #\. #\h #\t #\m #\l)
        (render-doc "doc" taxon (get-expanded-taxon-meta (list->string name)))]))
    (('GET "doc" path ... page) ; serve documents from /doc/
     (render-doc path page))
    (('GET "species.json")
     (render-json (get-species-data)))
    (('GET "species.meta.json")
     (render-json (get-species-meta)))
    (('GET "species")
     (render-json (get-species-meta)))
    (('GET id)
     (let ([names (get-species-shortnames (get-expanded-species))])
       (match (string->list id)
	 [(name ... #\. #\m #\e #\t #\a #\. #\j #\s #\o #\n) (render-json (get-expanded-taxon-meta (list->string name)))]
	 [(name ... #\. #\j #\s #\o #\n) (render-json
                                          (get-id-data (list->string name)))]
	 [rest (render-json "NOP")])))
    (_ (not-found (request-uri request)))
    ))

(define (request-path-components request)
  (split-and-decode-uri-path (uri-path (request-uri request))))

(define (handler request body)
  (format #t "~a ~a\n"
          (request-method request)
          (uri-path (request-uri request)))
  (apply values
         ((controller request body)
          (cons (request-method request)
                (request-path-components request)))))

(define (start-web-server address port)
  (format (current-error-port)
          "GN REST API web server listening on http://~a:~a/~%"
          address port)
  ;; Wrap handler in another function to support live hacking via the
  ;; REPL. If handler is passed as is and is then redefined via the
  ;; REPL, the web server will still be using the old handler. The
  ;; only way to update the handler reference held by the web server
  ;; would be to restart the web server.
  (run-server (cut handler <> <>)
              #:addr (inet-pton AF_INET address)
              #:port port))

(define (main args)
  (write (string-append "Starting Guile REST API " get-version " server!"))
  (write args)
  (newline)
  (let ((listen (inexact->exact (string->number (car (cdr args))))))
    (display `("listening on" ,listen))
    ;; (write listen)
    ;; (run-server hello-world-handler 'http `(#:port ,listen))))
    (start-web-server  "127.0.0.1" listen)))