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;;;;;
;;;;; $Id$
;;;;; Copyright (C) 1991  Lysator Academic Computer Association.
;;;;;
;;;;; This file is part of the LysKOM server.
;;;;; 
;;;;; LysKOM 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 1, or (at your option) 
;;;;; any later version.
;;;;; 
;;;;; LysKOM 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 LysKOM; see the file COPYING.  If not, write to
;;;;; Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
;;;;; or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
;;;;; MA 02139, USA.
;;;;;
;;;;; Please mail bug reports to bug-lyskom@lysator.liu.se. 
;;;;;
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;;; ================================================================
;;; ================================================================
;;;
;;; File: view-text.el
;;; 
;;; This file contains functions that have to do with putting
;;; a text into the lyskom buffer.
;;;


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(setq lyskom-clientversion-long 
      (concat lyskom-clientversion-long
	      "$Id$\n"))


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(defun lyskom-view-text (text-no &optional mark-as-read
				 follow-comments conf-stat priority
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				 build-review-tree filter-active)
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  "Display text number TEXT-NO.
Args: TEXT-NO &optional MARK-AS-READ FOLLOW-COMMENTS CONF-STAT 
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PRIORITY BUILD-REVIEW-TREE.
If MARK-AS-READ is non-nil the text will be marked as read.
If FOLLOW-COMMENTS is non-nil all comments and footnotes to this text will be
read before the next text. CONF-STAT must be the conference status of the
current conference, and PRIORITY the priority, if FOLLOW-COMMENTS is non-nil.
If BUILD-REVIEW-TREE is non-nil then it fixes a new entry in the 
lyskom-reading-list to read the comments to this."
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  (let ((filter (and filter-active
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		    (lyskom-filter-text-p text-no)))
	(todo nil))
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    (cond ((eq filter 'skip-text) (lyskom-filter-prompt text-no 'filter-text)
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	   (setq todo 'next-text)
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	   'next-text)
	  ((eq filter 'skip-tree)
	   (lyskom-filter-prompt text-no 'filter-tree)
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	   ;;(initiate-get-text-stat 'main 'lyskom-jump text-no t)
	   ;; Let's try something else:
	   (lyskom-jump (blocking-do 'get-text-stat text-no) t)
	   (lyskom-wait-queue 'main)

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	   (setq todo 'next-text)
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	   'next-text)
	  (t
	   (if (not (or (null filter) 
			(eq filter 'dontshow)))
	       (lyskom-message "%s" (lyskom-get-string 'invalid-filter-list)))
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	   (if (eq filter 'dontshow)
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	       (setq todo 'next-text))
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	   (blocking-do-multiple ((text-stat (get-text-stat text-no))
				  (text (get-text text-no)))
	     (if (and text-stat
		      text)
		 (progn
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		   (lyskom-format-insert "%#1n " 
					 text-stat)
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		   (lyskom-print-date-and-time (text-stat->creation-time
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                                        text-stat)
                                       'time-y-m-d-h-m)
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		   (lyskom-insert 
		    (if (= 1 (text-stat->no-of-lines text-stat))
			(lyskom-get-string 'line)
		      (lyskom-format 'lines 
				     (let ((n (text-stat->no-of-lines
					       text-stat)))
				       (if (= n 0) ; Added to increase
					   2 ; compatibility with old KOM. /lw
					 n)))))
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		   (if (eq filter 'dontshow)
		       (lyskom-format-insert "%#1P %#2s\n"
					     (text-stat->author text-stat)
					     (lyskom-get-string 'filtered))
		     (lyskom-format-insert "%#1P\n"
					   (text-stat->author text-stat)))
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		   ;; All recipients and other header lines.
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		   (if (eq filter 'dontshow)
		       nil
		     (lyskom-traverse misc
			 (text-stat->misc-info-list text-stat)
		       (let ((type (misc-info->type misc)))
			 (cond
			  ((or (eq type 'RECPT)
			       (eq type 'CC-RECPT))
			   (lyskom-print-header-recpt 
			    (blocking-do 'get-conf-stat
					 (misc-info->recipient-no
					  misc))
			    misc))
			  ((eq type 'COMM-IN)
			   (if kom-reading-puts-comments-in-pointers-last
			       nil
			     (lyskom-print-header-comm
			      (misc-info->comm-in misc)
			      misc)))
			  ((eq type 'FOOTN-IN)
			   (if kom-reading-puts-comments-in-pointers-last
			       nil
			     (lyskom-print-header-comm
			      (misc-info->footn-in misc)
			      misc)))
			  ((eq type 'COMM-TO)
			   (lyskom-print-header-comm (misc-info->comm-to misc)
						     misc))
			  ((eq type 'FOOTN-TO)
			   (lyskom-print-header-comm (misc-info->footn-to misc)
						     misc))
			  )))
		     (let ((num-marks (text-stat->no-of-marks text-stat))
			   (is-marked-by-me (cache-text-is-marked
					     (text-stat->text-no text-stat))))
		       (if (> num-marks 0)
			   (lyskom-insert 
			    (if is-marked-by-me
				(if (= num-marks 1)
				    (lyskom-get-string 'marked-by-you)
				  (if (= num-marks 2)
				      (lyskom-get-string 
				       'marked-by-you-and-one)
				    (lyskom-format 'marked-by-you-and-several
						   (1- num-marks))))
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			      (if (= num-marks 1)
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				  (lyskom-get-string 'marked-by-one)
				(lyskom-format 'marked-by-several
					       num-marks))))))
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		     (lyskom-print-text text-stat (blocking-do
						   'get-text text-no)
					mark-as-read text-no))
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		   (if kom-reading-puts-comments-in-pointers-last
		       (lyskom-view-text-handle-saved-comments text-stat))
		   
		   (if (or follow-comments
			   build-review-tree)
		       ;; This shows footnotes also.
		       (lyskom-follow-comments text-stat conf-stat mark-as-read
					       priority build-review-tree))
		   )
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	       (lyskom-format-insert 'no-such-text text-no)))))
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    todo))
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(defun lyskom-insert-person-name (conf-no)
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	    "Inserts the name the conf CONF-NO. If CONF-NO is 0 this person does not exist."
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  (let ((cs nil))
    (if (zerop conf-no)
	nil
      (setq cs (blocking-do 'get-conf-stat conf-no)))
    (if cs
	(lyskom-insert (conf-stat->name cs))
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      (if (eq conf-no 0)
	  (lyskom-format-insert 'person-is-anonymous)
	(lyskom-format-insert 'person-does-not-exist conf-no)))))
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(defun lyskom-insert-conf-name (conf-no)
  "Inserts the name the conf CONF-NO. If CONF-NO is 0 this person does not exist."
  (let ((cs nil))
    (if (zerop conf-no)
	nil
      (setq cs (blocking-do 'get-conf-stat conf-no)))
    (if cs
	(lyskom-insert (conf-stat->name cs))
      (lyskom-format-insert 'conf-does-not-exist conf-no))))



(defun lyskom-follow-comments (text-stat conf-stat 
					 mark-as-read priority review-tree)
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  "Arrange so that all comments and footnotes to this text will be read.
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This will essentially fix the reading list and issue calls for the cache to be
filled.

Arguments are: TEXT-STAT CONF-STAT PRIORITY REVIEW-TREE
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TEXT-STAT is the current text.
CONF-STAT the current conference
PRIORITY the priority of the reading.
If REVIEW-TREE is non-nil then build an entry of type 'REVIEW-TREE in the 
lyskom-reading-list."
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  ;; . Find footnotes and show them.
  ;; . Fix the reading-list
  ;; . Issue cache-filling initiate-calls for everything left comments.
  
  (let ((list))
    (lyskom-traverse misc (text-stat->misc-info-list text-stat)
      (cond
       ((and (eq (misc-info->type misc) 'FOOTN-IN)
	     (> (misc-info->footn-in misc) (text-stat->text-no text-stat))
	     kom-show-footnotes-immediately)
	;; Show the footnote
	(lyskom-view-text (misc-info->footn-in misc) mark-as-read)
	(lyskom-is-read (misc-info->footn-in misc)))
       ((eq (misc-info->type misc) 'FOOTN-IN)
	(setq list (cons (misc-info->footn-in misc) list)))
       ((eq (misc-info->type misc) 'COMM-IN)
	(setq list (cons (misc-info->comm-in misc) list)))))

    (let ((comments nil))
      (lyskom-traverse no list
	(cond
	 ((or review-tree
	      (not (lyskom-text-read-p (blocking-do 'get-text-stat no))))
	  (setq comments (cons no comments)))))
      (if comments
	  (read-list-enter-read-info
	   (lyskom-create-read-info (if review-tree 'REVIEW-TREE 'COMM-IN)
				    conf-stat priority
				    (lyskom-create-text-list comments)
				    (text-stat->text-no text-stat))
	   lyskom-reading-list t))
      ;; We have most of the text stats in the cache...
      ;; Just a few stray things to fill the cache...
      (lyskom-traverse no comments
	(initiate-get-text-stat 'fill-cache 'lyskom-fetch-text-for-cache no)))))


(defun lyskom-fetch-text-for-cache (text-stat)
  "Fetches the author and other things of a text and does nothing with it."
  (cond
   (text-stat
    (lyskom-fetch-author-for-cache text-stat)
    (initiate-get-text 'fill-cache nil (text-stat->text-no text-stat))
    (lyskom-traverse misc (text-stat->misc-info-list text-stat)
      (cond
       ((eq (misc-info->type misc) 'FOOTN-IN)
	(initiate-get-text-stat 'fill-cache 'lyskom-fetch-author-for-cache
				(misc-info->footn-in misc)))
       ((eq (misc-info->type misc) 'FOOTN-TO)
	(initiate-get-text-stat 'fill-cache 'lyskom-fetch-author-for-cache
				(misc-info->footn-to misc)))
       ((eq (misc-info->type misc) 'COMM-IN)
	(initiate-get-text-stat 'fill-cache 'lyskom-fetch-author-for-cache
				(misc-info->comm-in misc)))
       ((eq (misc-info->type misc) 'COMM-TO)
	(initiate-get-text-stat 'fill-cache 'lyskom-fetch-author-for-cache
				(misc-info->comm-to misc))))))))
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(defun lyskom-fetch-author-for-cache (text-stat)
  "Fetches the author of a text and does nothing with it."
  (if text-stat				;Error check.
      (initiate-get-conf-stat 'fill-cache nil (text-stat->author text-stat))))

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(defun lyskom-text-read-p (text-stat)
  "Return t if TEXT-STAT has been marked as read in all
recipients to it that the user is a member in."
  (let* ((misc-info-list (text-stat->misc-info-list text-stat))
	 (i (length misc-info-list))
	 (res t))
    (while (and res (not (zerop i)))
      (setq i (1- i))
      (let* ((misc-info (elt misc-info-list i))
	     (type (misc-info->type misc-info)))
	(cond
	 ((or (eq type 'RECPT) (eq type 'CC-RECPT))
	  (let ((membership (lyskom-member-p
			     (misc-info->recipient-no misc-info)))
		(loc-no (misc-info->local-no misc-info)))
	    (if (and membership
		     (> loc-no (membership->last-text-read membership))
		     (not (lyskom-vmemq loc-no
				       (membership->read-texts membership))))
		(setq res nil)))))))
    res))


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(defun lyskom-subtract-one-day (x)
  (let ((high-x (1- (car x)))
        (low-x (car (cdr x))))
    (if (> 20864 low-x)
        (setq high-x (1- high-x)
              low-x (+ low-x 65536)))
    (setq low-x (- low-x 20864))
    (list high-x low-x nil)))

(defun lyskom-calculate-day-diff (time)
  (let* ((now (current-time))
         (yesterday (lyskom-subtract-one-day now))
         (decnow (decode-time now))
         (decthen (decode-time yesterday)))
    (cond ((and (= (time->mday time) (elt decnow 3))
                (= (1+ (time->mon time)) (elt decnow 4))
                (= (+ (time->year time) 1900) (elt decnow 5)))
           'today)
          ((and (= (time->mday time) (elt decthen 3))
                (= (1+ (time->mon time)) (elt decthen 4))
                (= (+ (time->year time) 1900) (elt decthen 5)))
           'yesterday)
          (t nil))))

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(defun lyskom-return-date-and-time (time &optional fmt)
  "Return date and time as a string. Arg: TIME."
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  (let* ((diff (lyskom-calculate-day-diff time)))
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    (lyskom-format
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     (if (and diff lyskom-print-complex-dates)
         (intern (concat (symbol-name diff) "-time-format-string"))
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       (or fmt 'time-yyyy-mm-dd-hh-mm))
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     (+ (time->year time) 1900)
     (1+ (time->mon  time))
     (time->mday time)
     (time->hour time)
     (time->min  time)
     (and diff (lyskom-get-string diff)))))
                  
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(defun lyskom-print-date-and-time (time &optional fmt)
  "Print date and time. Arg: TIME"
  (lyskom-insert (lyskom-return-date-and-time time fmt)))
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(defun lyskom-print-text (text-stat text mark-as-read text-no)
  "Print a text. The header must already be printed.
Print an error message if TEXT-STAT or TEXT is nil.
Mark the text as read if (and only if) MARK-AS-READ is non-nil.
Args: TEXT-STAT TEXT MARK-AS-READ TEXT-NO."
  (cond
     ((or (null text)
	  (null text-stat))
      (lyskom-format-insert 'no-such-text-no text-no)
      (setq lyskom-previous-text lyskom-current-text)
      (setq lyskom-current-text text-no))
   (t
      (let* ((str (text->text-mass text))
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	     s1 s2 t1 t2 body)
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	(cond
	 ((string-match "\n" str)
	    (setq lyskom-current-subject (substring str 0 (match-beginning 0)))
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	    (setq body (substring str (match-end 0)))
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	    (lyskom-insert-string 'head-Subject)
	    (setq s1 (point-max))
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	    (lyskom-format-insert "%#1r\n" lyskom-current-subject)
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	    (setq s2 (point-max))
	    (if kom-dashed-lines
		(lyskom-insert 
		 "------------------------------------------------------------\n")
	      (lyskom-insert "\n"))
	    (setq t1 (point-max))
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	    (lyskom-format-insert "%#1t" body)
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	    (setq t2 (point-max)))
	 (t				;No \n found. Don't print header.
	  (setq s1 (point-max))
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	  (lyskom-format-insert "%#1t" str)
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	  (setq s2 (point-max))
	  (setq t1 (point-max)
		t2 (point-max))
	  (setq lyskom-current-subject "")))
	(if (lyskom-text-p (cache-get-text (text->text-no text)))
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	    (cache-del-text (text->text-no text)))
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	(sit-for 0)
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	(lyskom-format-insert 
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			(if kom-dashed-lines
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			    "\n(%#1n) -----------------------------------\n"
			  "\n(%#1n)\n")
			(text->text-no text))
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	(if mark-as-read
	    (lyskom-mark-as-read text-stat))
	(setq lyskom-previous-text lyskom-current-text)
	(setq lyskom-current-text (text-stat->text-no text-stat))))))


(defun lyskom-mark-as-read (text-stat)
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  "Mark a text as read in all conferences that are recipients.
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Tell the server that it is read.

Args: TEXT-STAT

This function does not remove the text from the internal structures of
the client. That is done by lyskom-is-read."
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  (let ((misc-info-list (text-stat->misc-info-list text-stat)))
    (lyskom-traverse
     misc-info misc-info-list
     (if (and (or (eq (misc-info->type misc-info) 'RECPT)
		  (eq (misc-info->type misc-info) 'CC-RECPT))
	      (lyskom-member-p (misc-info->recipient-no misc-info)))
	 (initiate-mark-as-read 'background nil
				(misc-info->recipient-no misc-info)
				(list (misc-info->local-no misc-info)))))))


(defun lyskom-print-header-recpt (conf-stat misc)
  "Print a line of info about a recipient (or cc-recipient) of a text."
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  (lyskom-format-insert "%#1s: %#2M <%#3d>\n"
			(cond ((eq (misc-info->type misc) 'RECPT)
			       (lyskom-get-string 'Recipient))
			      (t (lyskom-get-string 'Extra-recipient)))
			conf-stat
			(misc-info->local-no misc))
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  (if (misc-info->sent-at misc)
      (lyskom-format-insert 'send-at
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			    (lyskom-return-date-and-time 
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			     (misc-info->sent-at misc))))
  (if (misc-info->sender misc)
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	(lyskom-insert (lyskom-format 'sent-by (misc-info->sender misc))))
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  (if (misc-info->rec-time misc)
      (lyskom-format-insert 'recieved-at
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			    (lyskom-return-date-and-time (misc-info->rec-time misc)))))
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(defun lyskom-view-text-handle-saved-comments (text-stat)
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  "Ask server for what is needed to print the references to commenting texts 
and prints the references. Used at the bottom of the text.
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Args: TEXT-STAT of the text being read."
  (lyskom-traverse misc
      (text-stat->misc-info-list text-stat)
    (let ((type (misc-info->type misc)))
      (cond
       ((eq type 'COMM-IN)
	(lyskom-print-header-comm (misc-info->comm-in misc) misc))
       ((eq type 'FOOTN-IN)
	(lyskom-print-header-comm (misc-info->footn-in misc) misc))))))


(defun lyskom-print-header-comm (text misc)
  "Get author of TEXT-NO and print a header line."
  (let ((text-stat (blocking-do 'get-text-stat text)))
    ;;+++ error kommer att se annorlunda ut.
    (if text-stat
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	(let* ((author (blocking-do 'get-conf-stat
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				    (text-stat->author text-stat)))
	       (type (misc-info->type misc))
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	       (tyname (cond ((eq 0 (text-stat->author text-stat))
                          (lyskom-get-string 'person-is-anonymous))
                         ((null author)
                          (lyskom-format 'person-does-not-exist
                                         (text-stat->author text-stat)))
                         (t author))))
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	  (cond
	   ((eq type 'COMM-TO)
	    (lyskom-format-insert 'comment-to-text-by 
				  (misc-info->comm-to misc)
				  tyname))
	   ((eq type 'FOOTN-TO)
	    (lyskom-format-insert 'footnote-to-text-by
				  (misc-info->footn-to misc)
				  tyname))
	   ((eq type 'COMM-IN)
	    (lyskom-format-insert 'comment-in-text-by
				  (misc-info->comm-in misc)
				  tyname))
	   ((eq type 'FOOTN-IN)
	    (lyskom-format-insert 'footnote-in-text-by
				  (misc-info->footn-in misc)
				  tyname))))
      ;; Client tolerans agains buggy servers...
      ;; We are writing the line about what comments exists and
      ;; the reference text does not exist anymore. Strange.
      nil)))



;;; Local Variables: 
;;; eval: (put 'lyskom-traverse 'lisp-indent-hook 2)
;;; end: