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;;;; Greek Dictionary Web Engine
;;;; Copyright (C) 2004, 2005, 2006, 2007, 2010, 2011 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)
	     (gamma sql)
	     (ellinika elmorph)
	     (ellinika sql)
             (ellinika i18n)
	     (ellinika xlat)
	     (ellinika cgi))

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

(ellinika-cgi-init dict-template-file-name)

;; Τα μέρη του λόγου
(define part-of-speech '())

(define (sql-error-handler key func fmt fmtargs data)
  (format #t "<h1 class=\"error\">~A</h1>\n"
	  (_ "ΣΦΆΛΜΑ: σύνδεση με το λέξικο απέτυχε."))
  (apply format (current-error-port) fmt fmtargs))

(define (load-pos)
  (sql-ignore-failure
   (let ((plist (ellinika:sql-query
		 "SELECT name,id FROM pos WHERE canonical='Y' order by id")))
     (set! part-of-speech
	   (cons
	    (cons "κανένα μέρος του λόγου" #f)
	    (map
	     (lambda (x)
	       (cons (car x) (cadr x)))
	     plist))))))

(define (get-topic-list)
  (let ((categories #f))
    (letrec ((getcat
	      (lambda ()
		(sql-ignore-failure
		 (let ((ctg (ellinika:sql-query
			     "SELECT t.category, c.title, c.description\
 FROM category c,topic t\
 WHERE c.lang=~Q AND c.category=t.category GROUP BY 1 ORDER BY 1"
			     (language-code target-language))))
		   (if (null? ctg)
		       '()
		       (map
			(lambda (category)
			  (let ((topics (ellinika:sql-query
					 "SELECT ident,title FROM topic WHERE category=~Q ORDER BY title"
					 (car category))))
			    (append category (if (null? topics)
						 '()
						 (list topics)))))
			ctg)))))))
      (if (not categories)
	  (set! categories (or (getcat) '())))
      categories)))

(define (join-widget widget-id tabindex)
  (let* ((name (string-append "join" widget-id))
	 (selected-choice (or (let ((s (cgi:value name)))
				(if s
				    (string->number s)
				    #f))
			      0)))
    (display (string-append "<select name=\""
			    name
			    "\" tabindex=\""
			    tabindex
			    "\">"))
    (display "<option value=\"0\"")
    (if (= selected-choice 0)
	(display " selected=\"selected\""))
    (display ">") (display (_"και")) (display "</option>")
    (display "<option value=\"1\"")
    (if (= selected-choice 1)
	(display " selected=\"selected\""))
    (display ">") (display (_"ή")) (display "</option>")
    (display "</select>")))

(define (main-form)
  (load-pos)
  (display "<form action=\"")
  (display (make-cgi-name cgi-script-name))
  (display "\" method=\"post\">
<table class=\"noframe\">
<tr>
 <td>")
  (display (_"Εισάγετε τη λέξη"))
  (display "
 </td>
 <td>
  <input size=\"36\" name=\"key\" tabindex=\"1\"")
  (let ((value (cgi:value "key")))
    (if value
	(begin
	  (display " value=\"")
	  (display (cgi-protect-quotes value))
	  (display "\""))))
  (display " />
 </td>
</tr>")

  (display "<tr><td colspan=\"3\" align=\"center\">")
  (display (_"Συμπληρωματικοί όροι"))
  (display "</td></tr>")

  (display "
<tr>
 <td>")
  (display (_"Επιλέξτε το μέρος του λόγου"))
  (display "</td><td>")
  
  (let ((selected-choice (or (let ((s (cgi:value "pos")))
			       (if s
				   (string->number s)
				   #f))
			     0))
	(index 0))
    
    (display "<select name=\"pos\" tabindex=\"2\">")
    
    (for-each
     (lambda (x)
       (let ((name (car x)))
	 (display "<option value=\"")
	 (display index)
	 (display "\"")
	 (if (= index selected-choice)
	     (display " selected=\"selected\""))
	 (display ">")
	 (display name)
	 (display "</option>")
	 (set! index (1+ index))))
     part-of-speech)
    (display "</select>"))  

  (display "</td><td>")
  (join-widget "pos" "3")
  (display "</td></tr>")

  (let ((tabindex 4))
    (for-each
     (lambda (category)
       (display "<tr><td>")
       (display (list-ref category 1))
       (display "</td><td>")
       (let ((selected-choice (or (let ((s (cgi:value (list-ref category 0))))
				    (if s
					(string->number s)
					#f))
				  0)))

	 (display (string-append
		   "<select name=\""
		   (list-ref category 0)
		   "\" tabindex=\""
		   (number->string tabindex)
		   "\">"))
	 (set! tabindex (1+ tabindex))
	 (display " <option value=\"0\">---</option>")
	 (for-each
	  (lambda (x)
	    (let ((id (car x))
		  (name (car (cdr x))))
	      (display "<option value=\"")
	      (display id)
	      (display "\"")
	      (if (eq? (string->number id) selected-choice)
		  (display " selected"))
	      (display ">")
	      (display name)
	      (display "</option>")))
	  (list-ref category 3))
	 (display "</select>")
	 (display "</td><td>")
	 (join-widget (list-ref category 0) (number->string tabindex))
	 (display "</td></tr>")
	 (set! tabindex (1+ tabindex))))
     (get-topic-list))
  
    (display "
<tr>
 <td colspan=\"3\" align=\"center\">
  <input type=\"submit\" name=\"search\" value=\"")
    (display (_"Αναζήτηση"))
    (display "\" tabindex=\"")
    (display tabindex)
    (display "\" />
 </td>
</tr>
</table>
</form>
")))

;;
(define (replace-tilde word sentence)
  (apply
   string-append
   (let loop ((lst '())
	      (str sentence))
     (cond
      ((string-index str #\~) =>
       (lambda (x)
	 (loop
	  (append lst (list (substring str 0 x) word))
	  (substring str (1+ x)))))
      ((string-null? str)
       lst)
      (else
       (append lst (list str)))))))

;;
(define (display-results rlist)
  (let* ((x (car rlist))
	 (word (car x))
	 (isverb (> (string->number (list-ref x 6)) 0)))
    (display "<table class=\"dict-result\">")
    (display "<tr><td class=\"dict-word\">")
    (display word)
    (display "</td>")
    (cond
     ((list-ref x 3)
      (display "<td class=\"dict-word-forms\">")
      (let ((href (assoc (list-ref x 2) word-forms-reference)))
	(cond
	 (href
	  (display "<a href=\"")
	  (cond
	   (ref-loc
	    (display ref-loc)
	    (display "/")))
	  (display (language-code target-language))
	  (display "/")
	  (display (cdr href))
	  (display (dict:encode-string (car x)))
	  (display "\">")
	  (display (list-ref x 3))
	  (display "</a>"))
	 (else
	  (display (list-ref x 3)))))
      (display "</td>")))
    (display "<td class=\"dict-pos\">")
    (display (list-ref x 2))
    (display "</td>")
    (if isverb
	(format #t "<td class=\"conj-ref\"><a href=\"~A\">~A</a></td>"
		(make-cgi-name
		 (cgi-program-name "conj") "key" (dict:encode-string word))
		(_ "κλίση")))
    (display "</tr>"))
  (display "</table>")
  (newline)
  (display "<ol class=\"dict-articles\">")
  (for-each
   (lambda (x)
     (display "<li>")
     (display (replace-tilde (car x) (list-ref x 5)))
     (display ";</li>"))
   rlist)
  (display "</ol>")
  (newline))

(define (display-cross-reference word)
  (display "<a href=\"")
  (display (make-cgi-name cgi-script-name "ident" (dict:encode-string word)))
  (display "\">")
  (display word)
  (display "</a>"))

(define (display-xref rlist text)
  (display text)
  (let ((n 0))
    (for-each
     (lambda (x)
       (if (> n 0)
	   (display ", "))
       (set! n (1+ n))
       (display-cross-reference (car x)))
     rlist))
  (display ";"))

(define (sort-result input-list)
  (let ((output-list '())
	(current-element '()))
    (for-each
     (lambda (x)
       (cond
	((or (null? current-element)
	     (=  (string->number (cadr x))
		 (string->number (cadr (car current-element)))))
	 (set! current-element (cons x current-element)))
	(else
	 (set! output-list (cons (reverse current-element) output-list))
	 (set! current-element (list x)))))
     input-list)
    (cons (reverse current-element) output-list)))


(define (search-failure key)
  (display "<h2>")
  (format #t (_"Συγγνώμη, η λέξη \"~A\" δεν βρέθηκε στο λέξικο.") key)
  (display "</h2>"))

(define (fuzzy-search key theme pos)
  (let ((where-cond (list (string-append
			   "WHERE dict.ident=articles.ident and articles.lang='"
			   (utf8-escape (language-code target-language))
			   "' AND")))
	(select-stmt "SELECT DISTINCT dict.word FROM ")
	(from-list (list ",articles" "dict")))
    
    (cond
     ((not (null? theme))
      (set! where-cond (cons " topic_tab.word_ident=dict.ident"
			     where-cond))
      (set! from-list (cons ",topic_tab" from-list))))

    (cond
     ((not (string-null? key))
      (if (not (null? theme))
	  (set! where-cond (cons " AND" where-cond)))
      (set! where-cond (cons (string-append
			      " dict.sound LIKE \""
			      (utf8-escape (ellinika:sounds-like key))
			      "%\"")
			     where-cond))))

    (cond
     ((> (string->number pos) 0)
      (let ((pos-entry
	     (list-ref part-of-speech (string->number pos))))
	(if (or (not (string-null? key)) (not (null? theme)))
	    (set! where-cond (cons 
			      (if (string=? (cgi:value "joinpos") "0")
				  " AND"
				  " OR")
			      where-cond)))

	(set! where-cond (cons
			  (string-append " (dict.pos & "
					 (cdr pos-entry)
					 ") = "
					 (cdr pos-entry))
			  where-cond)))))

    (let ((result
	   (sql-query ellinika:sql-conn
		      (string-append
		       select-stmt
			      
		       " "
			      
		       (apply
			string-append
			(reverse from-list))

		       " "
			      
		       (apply
			string-append
			(append
			 (reverse where-cond)
			 (map
			  (lambda (x)
			    (cond
			     ((boolean? x)
			      (if x " AND" " OR"))
			     (else
			      (if (not (member ",topic_tab" from-list))
				  (set! from-list
					(cons ",topic_tab"
					      from-list)))
			      (string-append
			       " topic_tab.topic_ident=" x))))
			  theme)))
		       
		       " ORDER BY dict.word"))))
      
      (cond
       ((null? result)
	(search-failure key))
       (else
	(display "<table width=\"100%\" class=\"noframe\">")
	(let* ((result-length (length result))
	       (lim (1+ (quotient result-length match-list-columns))))
	  (do ((i 0 (1+ i)))
	      ((= i lim) #f)
	    (display "<tr>")	  
	    (do ((j i (+ j lim)))
		((>= j result-length) #f)
	      (display "<td>")
	      (display-cross-reference (car (list-ref result j)))
	      (display "</td>"))
	    (display "</tr>")))	  
	(display "</table>"))))))
  

(define (dict-search)
  (let ((keyval (if (cgi:value "ident")
		    (dict:decode-string (cgi:value "ident"))
		    (cgi:value "key")))
	(theme (do ((catlist (get-topic-list) (cdr catlist))
		    (ret '()))
		   ((null? catlist) ret)
		 (let ((name (caar catlist)))
		   (let ((v (cgi:value name)))
		     (if (and v (> (string->number v) 0))
			 (set! ret (append
				    ret
				    (list (= (string->number
					      (cgi:value (string-append "join" name))) 0)
					  v))))))))
	(pos (or (cgi:value "pos") "0")))

    (sql-catch-failure
     (cond
      ((and keyval
	    (not (string-null? keyval))
	    (null? theme)
	    (= (string->number pos) 0))
       (display "<hr>")
       (let* ((key (ellinika:translate-input keyval))
	      (result (ellinika:sql-query
		       "SELECT dict.word,dict.ident,pos.abbr,\
dict.forms,articles.subindex,articles.meaning,(dict.pos & conv(\"100000\",16,10))\
 FROM dict,articles,pos WHERE dict.word=~Q\
 AND dict.ident=articles.ident\
 AND articles.lang=~Q\
 AND dict.pos=pos.id\
 AND pos.canonical='Y' order by dict.ident, articles.subindex"
		       key
		       (language-code target-language))))

	 (cond
	  ((null? result)
	   (fuzzy-search key theme pos))
	  (else
	   (for-each
	    (lambda (entry)
	      (display-results entry)
	      (let ((ant (ellinika:sql-query
			  "SELECT dict.word FROM dict,links\
 WHERE links.type='ANT' AND links.ident=~Q AND dict.ident=links.xref\
 ORDER BY word"
			  (cadr (car entry)))))
		(if (and ant (not (null? ant)))
		    (display-xref ant
				  (if (= (length ant) 1)
				      (_"Αντώνυμο: ") (_"Αντώνυμα: ")))))
	      (display "<p>")
	      (let ((x (ellinika:sql-query
			"SELECT dict.word FROM dict,links\
 WHERE links.type='XREF' AND links.ident=~Q\
 AND dict.ident=links.xref ORDER BY word"
			(cadr (car entry)))))
		(if (and x (not (null? x)))
		    (display-xref x (_"Βλέπετε επίσης ")))))
	    (sort-result result))))))
      ((or (not (null? theme)) (> (string->number pos) 0))
       (display "<hr>")
       (fuzzy-search (ellinika:translate-input (or keyval "")) theme pos))))))

;;;

(define (stat key)
  (let ((stat-data #f))
    (if (not stat-data)
	(set! stat-data
	      (or
	       (sql-ignore-failure
		(ellinika:sql-query 
		 "SELECT count,updated from stat WHERE lang=~Q"
		 (language-code target-language)))
	       '())))
    
    (if (null? stat-data)
	"<>"
	(case key
	  ((#:updated)
	   (list-ref (car stat-data) 1))
	  ((#:count)
	   (list-ref (car stat-data) 0))
	  (else
	   "<>")))))
  

;;;
(define (dict-connect)
  (if (not ellinika:sql-conn)
      (ellinika:sql-connect ellinika-sql-connection)))

(define (dict-html)
  (sql-catch-failure
   (let ((explist (list
		   (cons "@@args@@"
			 (lambda ()
			   (for-each
			    (lambda (name)
			      (cond
			       ((string=? name "lang"))
			       (else
				(let ((v (cgi:value name)))
				  (cond ((and v (not (string-null? v)))
					 (display "&amp;")
					 (display name)
					 (display "=")
					 (display v)))))))
			    (cgi:names))))
		   (cons "@@dict@@"
			 (lambda ()
			   (dict-connect)
			   (main-form)
			   (dict-search)))
		  (cons "@@stat_updated@@"
			(lambda ()
			  (dict-connect)
			  (display (stat #:updated))))
		  (cons "@@stat_count@@"
			(lambda ()
			  (dict-connect)
			  (display
			   (let ((s (stat #:count)))
			     (if (string=? s "<>")
				 s
				 (let ((n (string->number s)))
				   (string-append s " "
						  (ngettext "λέξη" "λέξεις"
							    n)))))))))))
     (do ((line (read-line) (read-line)))
	 ((eof-object? line) #f)
       (expand-template explist line)
       (newline))
     (ellinika:sql-disconnect))))
  
;;; Main
ifelse(IFACE,[CGI],(display ["Content-type: text/html; charset=utf-8\r\n\r\n"]))

(with-input-from-file
    (template-file target-language dict-template-file-name)
  dict-html)


;;;; Local variables:
;;;; mode: Scheme
;;;; buffer-file-coding-system: utf-8
;;;; End:

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