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;;;; News page for Ellinika
;;;; Copyright (C) 2004, 2005, 2006, 2007, 2010, 2011, 2015 Sergey Poznyakoff
;;;; 
;;;; This program 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.
;;;;
;;;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
;;;;

;;; Tailor this statement to your needs if necessary.
(set! %load-path (cons "GUILE_SITE" %load-path))

(use-modules ifelse(IFACE,[CGI],(www cgi),(guile-user))
	     (ice-9 rdelim)
	     (xmltools dict)
	     (ellinika elmorph)
	     (ellinika sql)
	     (ellinika xlat)
	     (ellinika cgi)
	     (ellinika i18n))

ifelse(IFACE,[CGI],(cgi:init))

(define tmpl (if (and monima-nea-template-file-name
		      (cgi:value-u8 "timestamp"))
		 monima-nea-template-file-name
		 nea-template-file-name))

(ellinika-cgi-init tmpl)

(define article #f)
(define accepted-lang (map
		       (lambda (s)
			 (cond
			  ((string-split s #\;) =>
			   (lambda (l)
			     (car l)))
			  (else
			   s)))
		       (string-split (or
				      (getenv "HTTP_ACCEPT_LANGUAGE")
				      "")
				     #\,)))

(define nea-max-rows 20) ;; FIXME: Move to the config

(define (permalink tag timestamp)
  (display (string-append "<" tag " class=\"permalink\">"))
  (display "<a href=\"")
  (display (make-cgi-name cgi-script-name "timestamp" timestamp))
  (display "\">[permanent link]</a>")
  (display (string-append "</" tag ">")))

(define (sql-error-handler err descr)
  (format #t "<h1 class=\"error\">~A</h1>\n"
	  (_ "ΣΦΆΛΜΑ: σύνδεση με την βάση δεδομένων απέτυχε."))
  (apply format (current-error-port) fmt fmtargs))

(defmacro catch-sql (expr)
  `(catch 'gsql-error
	  (lambda () ,expr)
	  (lambda (key err descr)
	    (sql-error-handler err descr))))

(defmacro assert-article (. expr)
  `(if article
       (cond
	((null? article)
	 (format #t "<h1 class=\"error\">~A</h1>\n"
		 (_ "Κάμια καταχώρηση")))
	(else
	 ,@expr))))

(define (make-sql-list input-list)
  (let loop ((str "")
	     (input-list input-list))
    (if (null? input-list)
	(string-append "(" str ")")
	(loop (string-append str
			     (if (string-null? str) "'" ",'")
			     (utf8-escape (car input-list)) "'")
	      (cdr input-list)))))

(define (get-sql-lang ident langlist)
  (let ((res (map car
	      (ellinika:sql-query
	       "SELECT lang FROM newsart WHERE ident=~N AND lang in ~N"
	       ident (make-sql-list langlist)))))
    (cond
     ((null? res)
      #f)
     (else
      (call-with-current-continuation
       (lambda (return)
	 (for-each
	  (lambda (elt)
	    (if (member elt res)
		(return elt)))
	  langlist)))))))

(define (make-my-lang-list)
  (map language-code (cons target-language
			   accepted-lang)))


(define (collect-entries from fwd)
  (let loop ((start from)
	     (result '()))
    (cond
     ((not fwd)
      (set! start (- start nea-max-rows))
      (if (< start 0)
	  (set! start 0))))
    (call-with-current-continuation
     (lambda (return)
       (let ((tuples (ellinika:sql-query
		      "SELECT date,ident FROM news ORDER BY 1 DESC LIMIT ~N,~N"
		      start nea-max-rows)))
	 (cond
	  ((null? tuples)
	   (cons start (if fwd (reverse result) result)))
	  (else
	   (let ((langlist (make-my-lang-list))
		 (rest (- nea-max-rows (length result)))
		 (ctr 0))
	     (for-each
	      (lambda (entry)
		(let ((lang (get-sql-lang (list-ref entry 1) langlist)))
		  (set! ctr (1+ ctr))
		  (if lang
		      (let ((hdr (ellinika:sql-query
				  "SELECT header,lang\
 FROM newsart\
 WHERE ident=~N AND lang=~Q LIMIT 1"
				  (list-ref entry 1) lang)))
			(cond
			 (hdr
			  (set! result (cons
					(cons (caar hdr) entry)
					result))
			  (set! rest (1- rest))
			  (cond
			   ((= 0 rest)
			    (if fwd
				(return (cons (+ ctr start) (reverse result)))
				(return (cons (+ start (- nea-max-rows ctr))
					      result)))))))))))
	      
	      (if fwd
		  tuples
		  (reverse tuples)))

	     (cond
	      ((and (not fwd) (= 0 start))
	       (cons start (if fwd (reverse result) result)))
	      (else
	       (if fwd
		   (set! start (+ ctr start)))
	       (loop start result)))))))))))

(define (summary)
  (catch-sql
   (let* ((count (catch #t
		       (lambda ()
			 (string->number
			  (caar (ellinika:sql-query
				 "SELECT count(*) FROM news"))))
		       (lambda args
			 0)))
	  (from (catch #t
		       (lambda ()
			 (let ((x (string->number (cgi:value-u8 "from"))))
			   (if (< x count)
			       x
			       0)))
		       (lambda args
			 0)))
	  (fwd (let ((dir (cgi:value-u8 "dir")))
		 (or (not dir)
		     (string=? dir "1"))))
	  (entries (collect-entries from fwd)))
     
     (let ((start (car entries))
	   (result (cdr entries)))
       (cond
	((null? result)
	 (display "<div align=\"center\">")
	 (display (_ "Κανένα νέα"))
	 (display "</div>"))
	(else
	 (let ((num-entries (length result))
	       (begin (if fwd from start))
	       (end   (if fwd start from))
	       (id (cgi:value-u8 "id")))

	   (cond
	    ((not (and (= from 0) (< num-entries nea-max-rows)))
	     (display "<p>")
	     (format #t (_ "Εγγραφείς ~A - ~A") begin end)
	     (display "</p>")))
	   
	   (display "<table class=\"news-summary frame\">\n")
	   (let ((ctr 0)
		 (langlist (make-my-lang-list)))
	     (for-each
	      (lambda (entry)
		(display "<tr class=\"")
		(display (if (= (modulo ctr 2) 0) "even" "odd"))
		(display "\">\n")
		(set! ctr (1+ ctr))
		(display "<td class=\"date\">")
		(display (list-ref entry 1))
		(display "</td>")
		(display "<td class=\"subject")
		(cond
		 ((and id (string=? (list-ref entry 2) id))
		  (display " current\">")
		  (display (list-ref entry 0)))
		 (else
		  (display "\"><a href=\"")
		  (display (make-cgi-name cgi-script-name
					  "id" (list-ref entry 2)
					  "from" (number->string begin)))
		  (display "\">")
		  (display (list-ref entry 0))
		  (display "</a>")))
		(display "</td>")
		(display "\n</tr>\n"))
	      result))
	   (display "</table>")

	   (display "<div class=\"menu-bar\">")
	   (cond
	    ((> begin 0)
	     (display "<span class=\"menu-cell\"><a href=\"")
	     (display (apply make-cgi-name
			     cgi-script-name
			     "from" (number->string begin)
			     "dir" "0"
			     (if id
				 (list "id" id)
				 '())))
	     (display "\">")
	     (display (_ "Προηγούμενες"))
	     (display "</a></span>")))

	   (cond
	    ((< end count)
	     (display "<span class=\"menu-cell\"><a href=\"")
	     (display (apply make-cgi-name
			     cgi-script-name
			     "from" (number->string end)
			     "dir" "1"
			     (if id
				 (list "id" id)
				 '())))
	     (display "\">")
	     (display (_ "Ερχόμενες"))
	     (display "</a></span>")))
	   (display "</div>"))))))))

(define (display-article-header item)
  (display "<div id=\"news-header\">")
  (format #t "<span class=\"itemdate\">~A</span>\n" (car item))
  (display "<span class=\"itemsubject\">\n")
  (display (list-ref item 2))
  (display "</span>")
  (if (not (cgi:value-u8 "timestamp"))
      (permalink "span" (list-ref item 1)))
  (display "</div><!-- news-header -->"))

(define (display-article-text item . rest)
  (let ((class (and (not (null? rest)) (car rest))))
    (cond
     (class
      (display "\n<div class=\"")
      (display class)
      (display "\">\n")
      (display (list-ref item 3))
      (display "</div>\n"))
     (else
      (display (list-ref item 3))))))

(define (main)
  (catch-sql
   (assert-article
    (display-article-header article)
    (display-article-text article "itemtext"))))

(define (title)
  (if article
      (display (if (null? article)
		   (string-append
		    "<h1 class=\"error\">"
		    (_ "Κάμια καταχώρηση")
		    "</h1>")
		   (list-ref article 2)))))
      

(define (nea-html)
  (let ((explist (list (cons "@@main@@"     main)
		       (cons "@@summary@@"  summary)
		       (cons "@@title@@"    title)
		       (cons "@@article-text@@"
			     (lambda ()
			       (catch-sql
				(assert-article
				 (display-article-text article)))))
		       (cons "@@article-date@@"
			     (lambda ()
			       (catch-sql
				(assert-article
				 (display (car article))))))
		       (cons "@@article-header@@"
			     (lambda ()
			       (catch-sql
				(assert-article
				 (display (list-ref article 2))))))
		       (cons "@@full-header@@"
			     (lambda ()
			       (catch-sql
				(assert-article
				 (display-article-header
				  article)))))
		       (cons "@@args@@"
			     (lambda ()
			       (for-each
				(lambda (name)
				  (cond
				   ((string=? name "lang"))
				   (else
				    (let ((v (cgi:value-u8 name)))
				      (cond ((and v (not (string-null? v)))
					     (display "&amp;")
					     (display name)
					     (display "=")
					     (display v)))))))
				(cgi:names)))))))
  
    (do ((line (read-line) (read-line)))
	((eof-object? line) #f)
      (expand-template explist line)
      (newline))))

(define (nea-rss-header)
  (display "<?xml version=\"1.0\"?>\n")
  (display "<rss version=\"2.0\">
  <channel>
    <title>Τα νέα</title>
    <description>Τα νέα</description>
    <link>http://ellinika.gnu.org.ua</link>")
  (format #t "<language>~A</language>" (language-code target-language))
  (display "
    <generator>EllinikaNea</generator>
    <copyright>2006 Sergey Poznyakoff</copyright>
    <managingEditor>gray@gnu.org.ua</managingEditor>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
"))

(define (nea-rss-footer)
  (display "  </channel>
</rss>"))

(define (nea-rss)
  (nea-rss-header)
  (catch 'gsql-error
	 (lambda ()
	   (ellinika:sql-connect ellinika-sql-connection)
	   (for-each
	    (lambda (tuple)
	      (display "<item>\n")
	      (display "<pubDate>")
	      (display (list-ref tuple 0))
	      (display "</pubDate>\n")
	      (display "<title>")
	      (let ((title (ellinika:sql-query 
			    "SELECT header\
 FROM newsart\
 WHERE ident=~N AND lang=~Q LIMIT 1"
			    (list-ref tuple 2)
			    (get-sql-lang (list-ref tuple 2)
					  (make-my-lang-list)))))
		(display (if (not (null? title))
			     (caar title)
			     (list-ref tuple 0))))
	      (display "</title>\n")
	      (display "<link>")
	      (display (string-append
			(string-downcase cgi-server-protocol-name)
			"://"
			cgi-server-hostname
			"/"
			(make-cgi-name cgi-script-name
				       "timestamp" (list-ref tuple 1))))
	      (display "</link>\n")
	      (display "</item>\n"))
	    (ellinika:sql-query
	     "SELECT date,unix_timestamp(date),ident\
 FROM news\
 ORDER BY 1 DESC LIMIT 10")))
	 (lambda (key err descr)
	   (sql-error-handler err descr)))
  (nea-rss-footer))


(define (get-article-by-timestamp ts)
  (let ((tuples (ellinika:sql-query
		 "SELECT date,unix_timestamp(date),ident FROM news\
 WHERE unix_timestamp(date)=~Q" ts)))
    (cond
     (tuples
      (let* ((res (car tuples))
	     (lang (get-sql-lang (list-ref res 2) (make-my-lang-list)))
	     (art (ellinika:sql-query 
		   "SELECT header,text,lang\
 FROM newsart\
 WHERE ident=~N\
 AND lang=~Q\
 LIMIT 1"
		   (list-ref res 2) lang)))
	(append
	 (list (list-ref res 0)
	       (list-ref res 1))
	 (car art)))))))


;;; Main

(cond
 ((cgi:value-u8 "rss")
  ifelse(IFACE,[CGI],
         (display ["Content-type: text/xml; charset=utf-8\r\n\r\n"]),
	 (request-rec:set-content-type! Request ["text/xml; charset=UTF-8"]))
  (nea-rss))
 (else
  (catch 'gsql-error
	 (lambda ()
	   ifelse(IFACE,[CGI],dnl
	   (display ["Content-type: text/html; charset=utf-8\r\n\r\n"]))
	   (ellinika:sql-connect ellinika-sql-connection)
	   (cond
	    ((or (cgi:value-u8 "timestamp") (cgi:value-u8 "id"))
	     (let ((tuples
		    (cond
		     ((cgi:value-u8 "timestamp") =>
		      (lambda (ts)
			(ellinika:sql-query
			 "SELECT date,unix_timestamp(date),ident\
 FROM news WHERE unix_timestamp(date)=~Q" ts)))
		     ((cgi:value-u8 "id") =>
		      (lambda (id)
			(ellinika:sql-query
			 "SELECT date,unix_timestamp(date),ident\
 FROM news WHERE ident=~N" id))))))
	       
	       (if (not (null? tuples))
		   (let* ((res (car tuples))
			  (lang (get-sql-lang (list-ref res 2)
					      (make-my-lang-list)))
			  (art (ellinika:sql-query
				"SELECT header,text,lang\
 FROM newsart\
 WHERE ident=~N AND lang=~Q LIMIT 1"
				(list-ref res 2)
				lang)))
		     (set! article (append
				    (list (list-ref res 0)
					  (list-ref res 1))
				    (car art))))))))

	   (with-input-from-file
	       (template-file target-language tmpl)
	     nea-html)
	   
	   (ellinika:sql-disconnect))
	 
	 (lambda (key err descr)
	   (with-input-from-file
	       (template-file target-language tmpl)
	     (lambda ()
	       (let ((explist
		      (list (cons "@@main@@"
				  (lambda ()
				    (sql-error-handler err descr)))
			    (cons "@@article-text@@"
				  (lambda ()
				    (sql-error-handler err descr)))
			    (cons "@@summary@@"  (lambda () #f))
			    (cons "@@title@@"    (lambda () #f))
			    (cons "@@article-date@@" (lambda () #f))
			    (cons "@@article-header@@" (lambda () #f))
			    (cons "@@full-header@@" (lambda () #f)))))
		 (do ((line (read-line) (read-line)))
		     ((eof-object? line) #f)	       
		   (expand-template explist line)
		   (newline)))))))))
	 
;;;; Local variables:
;;;; mode: Scheme
;;;; buffer-file-coding-system: utf-8
;;;; End:

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