;; mixi.el --- API library for accessing to mixi

;; Copyright (C) 2005,2006 OHASHI Akira

;; Author: OHASHI Akira <bg66@koka-in.org>
;; Keywords: hypermedia

;; This file is *NOT* a part of Emacs.

;; 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 2, 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, you can either send email to this
;; program's maintainer or write to: The Free Software Foundation,
;; Inc.; 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

;;; Commentary:

;; API for getting contents:
;;
;;  * mixi-get-friends
;;  * mixi-get-favorites
;;  * mixi-get-logs
;;  * mixi-get-diaries
;;  * mixi-get-new-diaries
;;  * mixi-get-communities
;;  * mixi-get-topics
;;  * mixi-get-new-topics
;;  * mixi-get-comments
;;  * mixi-get-new-comments

;; Example:
;;
;; Display newest 3 diaries like a mail format.
;;
;; (let ((max-numbers 3)
;;       (buffer (generate-new-buffer "*temp*"))
;;       (format "%Y/%m/%d %H:%M"))
;;   (pop-to-buffer buffer)
;;   (mapc (lambda (diary)
;; 	  (let ((subject (mixi-diary-title diary))
;; 		;; Don't get owner's nick at first for omitting a useless
;; 		;; retrieval.
;; 		(from (mixi-friend-nick (mixi-diary-owner diary)))
;; 		(date (format-time-string format (mixi-diary-time diary)))
;; 		(body (mixi-diary-content diary)))
;; 	    (insert "From: " from "\n"
;; 		    "Subject: " subject "\n"
;; 		    "Date: " date "\n\n"
;; 		    body "\n\n")))
;; 	(mixi-get-new-diaries max-numbers))
;;   (set-buffer-modified-p nil)
;;   (setq buffer-read-only t)
;;   (goto-char (point-min)))
;;
;; Display newest 3 diaries including newest 3 comments like a mail format.
;; Comments are displayed like a reply mail.
;;
;; (let ((max-numbers 3)
;;       (buffer (generate-new-buffer "*temp*"))
;;       (format "%Y/%m/%d %H:%M"))
;;   (pop-to-buffer buffer)
;;   (mapc (lambda (diary)
;; 	  (let ((subject (mixi-diary-title diary))
;;  		;; Don't get owner's nick at first for omitting a useless
;;  		;; retrieval.
;;  		(from (mixi-friend-nick (mixi-diary-owner diary)))
;; 		(date (format-time-string format (mixi-diary-time diary)))
;; 		(body (mixi-diary-content diary)))
;; 	    (insert "From: " from "\n"
;; 		    "Subject: " subject "\n"
;; 		    "Date: " date "\n\n"
;; 		    body "\n\n")
;; 	    (mapc (lambda (comment)
;; 		    (let ((from (mixi-friend-nick
;; 				 (mixi-comment-owner comment)))
;; 			  (subject (concat "Re: " subject))
;; 			  (date (format-time-string
;; 				 format (mixi-comment-time comment)))
;; 			  (body (mixi-comment-content comment)))
;; 		      (insert "From: " from "\n"
;; 			      "Subject: " subject "\n"
;; 			      "Date: " date "\n\n"
;; 			      body "\n\n")))
;; 		  (mixi-get-comments diary max-numbers))))
;; 	(mixi-get-new-diaries max-numbers))
;;   (set-buffer-modified-p nil)
;;   (setq buffer-read-only t)
;;   (goto-char (point-min)))

;;; Code:

(condition-case nil
    (require 'url)
  (error))

(condition-case nil
    (require 'w3m)
  (error))

(eval-when-compile (require 'cl))

(defgroup mixi nil
  "API library for accessing to mixi."
  :group 'hypermedia)

(defcustom mixi-url "http://mixi.jp"
  "*The URL of mixi."
  :type 'string
  :group 'mixi)

(defcustom mixi-coding-system 'euc-jp
  "*Coding system for mixi."
  :type 'coding-system
  :group 'mixi)

(defcustom mixi-retrieve-function
  (if (fboundp 'url-retrieve-synchronously)
      'mixi-w3-retrieve 'mixi-w3m-retrieve)
  "*The function for retrieving."
  :type '(choice (const :tag "Using w3" mixi-w3-retrieve)
		 (const :tag "Using w3m" mixi-w3m-retrieve)
		 (const :tag "Using curl" mixi-curl-retrieve)
		 (function :format "Other function: %v\n" :size 0))
  :group 'mixi)

(defcustom mixi-curl-program "curl"
  "*The program name of `curl'."
  :type 'file
  :group 'mixi)

(defcustom mixi-curl-cookie-file (expand-file-name "~/.mixi-cookies.txt")
  "*The location of cookie file created by `curl'."
  :type 'file
  :group 'mixi)

(defcustom mixi-default-email nil
  "*Default E-mail address that is used to login automatically."
  :type '(choice (string :tag "E-mail address")
		 (const :tag "Asked when it is necessary" nil))
  :group 'mixi)

(defcustom mixi-default-password nil
  "*Default password that is used to login automatically."
  :type '(choice (string :tag "Password")
		 (const :tag "Asked when it is necessary" nil))
  :group 'mixi)

(defcustom mixi-accept-adult-contents t
  "*If non-nil, accept to access to the adult contents."
  :type 'boolean
  :group 'mixi)

(defcustom mixi-continuously-access-interval 4.0
  "*Time interval between each mixi access.
Increase this value when unexpected error frequently occurs."
  :type 'number
  :group 'mixi)

(defcustom mixi-cache-expires 3600
  "*Seconds for expiration of a cached object."
  :type '(choice (integer :tag "Expired seconds")
		 (const :tag "Don't expire" nil))
  :group 'mixi)

;; FIXME: Not implemented.
(defcustom mixi-cache-use-file t
  "*If non-nil, caches are saved to files."
  :type 'boolean
  :group 'mixi)

(defcustom mixi-cache-directory (expand-file-name "~/.mixi")
  "*Where to look for cache files."
  :type 'directory
  :group 'mixi)

(defvar mixi-me nil)

;; Utilities.
(defmacro mixi-message (string)
  `(concat "[mixi] " ,string))

(defconst mixi-message-adult-contents
  "このページから先はアダルト（成人向け）コンテンツが含まれています。<br>
閲覧に同意された方のみ、先へお進みください。")
(defconst mixi-message-continuously-accessing
  "安定してサイトの運営をおこなう為、間隔を空けない連続的なページの遷移・更<br>
新は制限させていただいております。ご迷惑をおかけいたしますが、しばらくお<br>
待ちいただいてから操作をおこなってください。")
(defconst mixi-warning-continuously-accessing
  "間隔を空けない連続的なページの遷移・更新を頻繁におこなわれていることが見<br>
受けられましたので、一時的に操作を停止させていただきます。申し訳ございま<br>
せんが、しばらくの間お待ちください。")

(defun mixi-retrieve-1 (buffer url &optional post-data)
  (when (string-match mixi-message-adult-contents buffer)
    (if mixi-accept-adult-contents
	(setq buffer (funcall mixi-retrieve-function url "submit=agree"))
      (setq buffer (funcall mixi-retrieve-function (concat url "?")))))
  (when (string-match mixi-warning-continuously-accessing buffer)
    (error (mixi-message "Continuously accessing")))
  (if (not (string-match mixi-message-continuously-accessing buffer))
      buffer
    (message (mixi-message "Waiting for continuously accessing..."))
    (sit-for mixi-continuously-access-interval)
    (funcall mixi-retrieve-function url post-data)))

(defun mixi-w3-retrieve (url &optional post-data)
  "Retrieve the URL and return gotten strings."
  (if post-data
      (progn
	(setq url-request-method "POST")
	(setq url-request-data post-data))
    (setq url-request-method "GET")
    (setq url-request-data nil))
  (let* ((url (url-expand-file-name url mixi-url))
	 (buffer (url-retrieve-synchronously url))
	 ret)
    (unless (bufferp buffer)
      (error (mixi-message "Cannot retrieve")))
    (with-current-buffer buffer
      (goto-char (point-min))
      (if (re-search-forward "HTTP/[0-9.]+ 302 Moved" nil t)
	  (if (re-search-forward
	       (concat "Location: " mixi-url "\\(.+\\)") nil t)
	      (setq ret (mixi-w3-retrieve (match-string 1) post-data))
	    (setq ret (mixi-w3-retrieve "/home.pl" post-data)))
	(unless (re-search-forward "HTTP/[0-9.]+ 200 OK" nil t)
	  (error (mixi-message "Cannot retrieve")))
	(search-forward "\n\n")
	(setq ret (mm-decode-coding-string
		   (buffer-substring-no-properties (point) (point-max))
		   mixi-coding-system))
	(kill-buffer buffer)
	(setq ret (mixi-retrieve-1 ret url post-data))))
    ret))

(defun mixi-w3m-retrieve (url &optional post-data)
  "Retrieve the URL and return gotten strings."
  (let ((url (w3m-expand-url url mixi-url)))
    (with-temp-buffer
      (if (not (string= (w3m-retrieve url nil nil post-data) "text/html"))
	  (error (mixi-message "Cannot retrieve"))
	(w3m-decode-buffer url)
	(let ((ret (buffer-substring-no-properties (point-min) (point-max))))
	  (mixi-retrieve-1 ret url post-data))))))

(defun mixi-curl-retrieve (url &optional post-data)
  "Retrieve the URL and return gotten strings."
  (with-temp-buffer
    (if (fboundp 'set-buffer-multibyte)
	(set-buffer-multibyte nil))
    (let ((orig-mode (default-file-modes))
	  (coding-system-for-read 'binary)
	  (coding-system-for-write 'binary)
	  process ret)
      (unwind-protect
	  (progn
	    (set-default-file-modes 448)
	    (setq process
		  (apply #'start-process "curl" (current-buffer)
			 mixi-curl-program
			 (append (if post-data '("-d" "@-"))
				 (list "-i" "-L" "-s"
				       "-b" mixi-curl-cookie-file
				       "-c" mixi-curl-cookie-file
				       (concat mixi-url url)))))
	    (set-process-sentinel process #'ignore))
	(set-default-file-modes orig-mode))
      (when post-data
	(process-send-string process (concat post-data "\n"))
	(process-send-eof process))
      (while (eq (process-status process) 'run)
	(accept-process-output process 1))
      (goto-char (point-min))
      (while (looking-at "HTTP/[0-9]+\\.[0-9]+ [13][0-9][0-9]")
	(delete-region (point) (re-search-forward "\r?\n\r?\n")))
      (unless (looking-at "HTTP/[0-9]+\\.[0-9]+ 200")
	(error (mixi-message "Cannot retrieve")))
      (delete-region (point) (re-search-forward "\r?\n\r?\n"))
      (setq ret (decode-coding-string (buffer-string) mixi-coding-system))
      (mixi-retrieve-1 ret url post-data))))

(defconst mixi-my-id-regexp
  "<a href=\"add_diary\\.pl\\?id=\\([0-9]+\\)")

(defun mixi-login (&optional email password)
  "Login to mixi."
  (when (and (eq mixi-retrieve-function 'mixi-w3m-retrieve)
	     (not w3m-use-cookies))
    (error
     (mixi-message
      "Require to accept cookies.  Please set `w3m-use-cookies' to t.")))
  (let ((email (or email mixi-default-email
		   (read-from-minibuffer (mixi-message "Login Email: "))))
	(password (or password mixi-default-password
		      (read-passwd (mixi-message "Login Password: ")))))
    (let ((buffer (funcall mixi-retrieve-function "/login.pl"
			   (concat "email=" email
				   "&password=" password
				   "&next_url=/home.pl"
				   "&sticky=on"))))
      (unless (string-match "url=/check\\.pl\\?n=" buffer)
	(error (mixi-message "Cannot login")))
      (setq buffer (funcall mixi-retrieve-function "/check.pl?n=home.pl"))
      (if (string-match mixi-my-id-regexp buffer)
	  (setq mixi-me (mixi-make-friend (match-string 1 buffer)))
	(error (mixi-message "Cannot login"))))))

(defun mixi-logout ()
  (funcall mixi-retrieve-function "/logout.pl"))

(defmacro with-mixi-retrieve (url &rest body)
  `(let (buffer)
     (when ,url
       (setq buffer (funcall mixi-retrieve-function ,url))
       (when (string-match "login.pl" buffer)
	 (mixi-login)
	 (setq buffer (funcall mixi-retrieve-function ,url))))
     ,@body))
(put 'with-mixi-retrieve 'lisp-indent-function 'defun)
(put 'with-mixi-retrieve 'edebug-form-spec '(form body))

(defun mixi-get-matched-items (url max-numbers regexp)
  "Get matched items to REGEXP in URL."
  (let ((page 1)
	ids)
    (catch 'end
      (while (or (null max-numbers) (< (length ids) max-numbers))
	(with-mixi-retrieve (format url page)
	  (let ((pos 0))
	    (while (and (string-match regexp buffer pos)
			(or (null max-numbers) (< (length ids) max-numbers)))
	      (let ((num 1)
		    list)
		(while (match-string num buffer)
		  (setq list (cons (match-string num buffer) list))
		  (incf num))
		(when (member (reverse list) ids)
		  (throw 'end ids))
		(setq ids (cons (reverse list) ids))
		(setq pos (match-end (1- num)))))
	    (when (eq pos 0)
	      (throw 'end ids))))
	(incf page)))
    ;; FIXME: Sort? Now order by newest.
    (reverse ids)))

;; stolen (and modified) from shimbun.el
(defun mixi-remove-markup (string)
  "Remove markups from STRING."
  (with-temp-buffer
    (insert string)
    (save-excursion
      (goto-char (point-min))
      (while (search-forward "<!--" nil t)
	(delete-region (match-beginning 0)
		       (or (search-forward "-->" nil t)
			   (point-max))))
      (goto-char (point-min))
      (while (re-search-forward "<[^>]+>" nil t)
	(replace-match "" t t))
      (goto-char (point-min))
      (while (re-search-forward "
" nil t)
	(replace-match "\n" t t)))
    (buffer-string)))

;; Cache.
;; stolen from time-date.el
(defun mixi-time-less-p (t1 t2)
  "Say whether time value T1 is less than time value T2."
  (or (< (car t1) (car t2))
      (and (= (car t1) (car t2))
	   (< (nth 1 t1) (nth 1 t2)))))

(defun mixi-time-add (t1 t2)
  "Add two time values.  One should represent a time difference."
  (let ((low (+ (cdr t1) (cdr t2))))
    (cons (+ (car t1) (car t2) (lsh low -16)) low)))

;; stolen from time-date.el
(defun mixi-seconds-to-time (seconds)
  "Convert SECONDS (a floating point number) to a time value."
  (cons (floor seconds 65536)
	(floor (mod seconds 65536))))

(defun mixi-cache-expired-p (object)
  "Whether a cache of OBJECT is expired."
  ;; FIXME: Use method instead of `(aref (cdr object) 0)'.
  (let ((timestamp (aref (cdr object) 0)))
    (unless (or (null mixi-cache-expires)
		 (null timestamp))
      (mixi-time-less-p
       (mixi-time-add timestamp (mixi-seconds-to-time mixi-cache-expires))
       (current-time)))))

(defun mixi-make-cache (key value table)
  "Make a cache object and return it."
  (let ((cache (gethash key table)))
    (if (and cache (not (mixi-cache-expired-p cache)))
	cache
      (puthash key value table))))

;; Object.
(defconst mixi-object-prefix "mixi-")

(defmacro mixi-object-class (object)
  `(car-safe ,object))

(defmacro mixi-object-p (object)
  `(eq (string-match (concat "^" mixi-object-prefix)
		     (symbol-name (mixi-object-class ,object))) 0))

(defun mixi-object-name (object)
  "Return the name of OBJECT."
  (unless (mixi-object-p object)
    (signal 'wrong-type-argument (list 'mixi-object-p object)))
  (let ((class (mixi-object-class object)))
    (substring (symbol-name class) (length mixi-object-prefix))))

(defun mixi-object-id (object)
  "Return the id of OBJECT."
  (unless (mixi-object-p object)
    (signal 'wrong-type-argument (list 'mixi-object-p object)))
  (let ((func (intern (concat mixi-object-prefix
			      (mixi-object-name object) "-id"))))
    (funcall func object)))

;; Friend object.
(defvar mixi-friend-cache (make-hash-table :test 'equal))
(defun mixi-make-friend (id &optional nick)
  "Return a friend object."
  (mixi-make-cache id (cons 'mixi-friend (vector nil id nick nil nil nil nil
						 nil nil nil nil nil nil nil))
		   mixi-friend-cache))

(defun mixi-make-me ()
  (unless mixi-me
    (with-mixi-retrieve "/home.pl"
      (if (string-match mixi-my-id-regexp buffer)
	  (setq mixi-me (mixi-make-friend (match-string 1 buffer)))
	(signal 'error (list 'who-am-i)))))
  mixi-me)

(defmacro mixi-friend-p (friend)
  `(eq (mixi-object-class ,friend) 'mixi-friend))

(defmacro mixi-friend-page (friend)
  `(concat "/show_friend.pl?id=" (mixi-friend-id ,friend)))

(defconst mixi-friend-nick-regexp
  "<img alt=\"\\*\" src=\"http://img\\.mixi\\.jp/img/dot0\\.gif\" width=\"1\" height=\"5\"><br>\n\\(.*\\)さん([0-9]+)")
(defconst mixi-friend-name-sex-regexp
  "<td BGCOLOR=#F2DDB7 WIDTH=80 NOWRAP><font COLOR=#996600>名\\(&nbsp;\\| \\)前</font></td>\n+<td WIDTH=345>\\([^<]+\\) (\\([男女]\\)性)</td>")
(defconst mixi-friend-address-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>現住所</font></td>\n<td>\\(.+\\)\\(\n.+\n\\)?</td></tr>")
(defconst mixi-friend-age-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>年\\(&nbsp;\\| \\)齢</font></td>\n<td>\\([0-9]+\\)歳\\(\n.+\n\\)?</td></tr>")
(defconst mixi-friend-birthday-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>誕生日</font></td>\n<td>\\([0-9]+\\)月\\([0-9]+\\)日\\(\n.+\n\\)?</td></tr>")
(defconst mixi-friend-blood-type-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>血液型</font></td>\n<td>\\([ABO]B?\\)型\\(\n\n\\)?</td></tr>")
(defconst mixi-friend-birthplace-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>出身地</font>\n?</td>\n<td>\\(.+\\)\\(\n.+\n\\)?</td></tr>")
(defconst mixi-friend-hobby-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>趣\\(&nbsp;\\| \\)味</font></td>\n<td>\\(.+\\)</td></tr>")
(defconst mixi-friend-job-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>職\\(&nbsp;\\| \\)業</font></td>\n<td>\\(.+\\)\\(\n.+\n\\)?</td></tr>")
(defconst mixi-friend-organization-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>所\\(&nbsp;\\| \\)属</font></td>\n<td[^>]*>\\(.+\\)\\(\n.+\n\\)?</td></tr>")
(defconst mixi-friend-profile-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>自己紹介</font></td>\n<td CLASS=h120>\\(.+\\)</td></tr>")

(defun mixi-friend-realize (friend)
  "Realize a FRIEND."
  ;; FIXME: Check a expiration of cache?
  (unless (mixi-friend-realize-p friend)
    (let (buf)
      (with-mixi-retrieve (mixi-friend-page friend)
	(setq buf buffer))
      (if (string-match mixi-friend-nick-regexp buf)
	  (mixi-friend-set-nick friend (match-string 1 buf))
	(signal 'error (list 'cannot-find-nick friend)))
      ;; For getting my profile.
      (unless (string-match mixi-friend-name-sex-regexp buf)
	(with-mixi-retrieve "/show_profile.pl"
	  (setq buf buffer)))
      (if (string-match mixi-friend-name-sex-regexp buf)
	  (progn
	    (mixi-friend-set-name friend (match-string 2 buf))
	    (mixi-friend-set-sex friend
				 (if (string= (match-string 3 buf) "男")
				     'male 'female)))
	(signal 'error (list 'cannot-find-name-or-sex friend)))
      (when (string-match mixi-friend-address-regexp buf)
	(mixi-friend-set-address friend (match-string 1 buf)))
      (when (string-match mixi-friend-age-regexp buf)
	(mixi-friend-set-age
	 friend (string-to-number (match-string 2 buf))))
      (when (string-match mixi-friend-birthday-regexp buf)
	(mixi-friend-set-birthday
	 friend (list (string-to-number (match-string 1 buf))
		      (string-to-number (match-string 2 buf)))))
      (when (string-match mixi-friend-blood-type-regexp buf)
	(mixi-friend-set-blood-type friend (intern (match-string 1 buf))))
      (when (string-match mixi-friend-birthplace-regexp buf)
	(mixi-friend-set-birthplace friend (match-string 1 buf)))
      (when (string-match mixi-friend-hobby-regexp buf)
	(mixi-friend-set-hobby
	 friend (split-string (match-string 2 buf) ", ")))
      (when (string-match mixi-friend-job-regexp buf)
	(mixi-friend-set-job friend (match-string 2 buf)))
      (when (string-match mixi-friend-organization-regexp buf)
	(mixi-friend-set-organization friend (match-string 2 buf)))
      (when (string-match mixi-friend-profile-regexp buf)
	(mixi-friend-set-profile
	 friend (mixi-remove-markup (match-string 1 buf)))))
    (mixi-friend-touch friend)))

(defun mixi-friend-realize-p (friend)
  "Return the timestamp of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aref (cdr friend) 0))

(defun mixi-friend-id (friend)
  "Return the id of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aref (cdr friend) 1))

(defun mixi-friend-nick (friend)
  "Return the nick of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (unless (aref (cdr friend) 2)
    (mixi-friend-realize friend))
  (aref (cdr friend) 2))

(defun mixi-friend-name (friend)
  "Return the name of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (mixi-friend-realize friend)
  (aref (cdr friend) 3))

(defun mixi-friend-sex (friend)
  "Return the sex of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (mixi-friend-realize friend)
  (aref (cdr friend) 4))

(defun mixi-friend-address (friend)
  "Return the address of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (mixi-friend-realize friend)
  (aref (cdr friend) 5))

(defun mixi-friend-age (friend)
  "Return the age of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (mixi-friend-realize friend)
  (aref (cdr friend) 6))

(defun mixi-friend-birthday (friend)
  "Return the birthday of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (mixi-friend-realize friend)
  (aref (cdr friend) 7))

(defun mixi-friend-blood-type (friend)
  "Return the blood type of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (mixi-friend-realize friend)
  (aref (cdr friend) 8))

(defun mixi-friend-birthplace (friend)
  "Return the birthplace of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (mixi-friend-realize friend)
  (aref (cdr friend) 9))

(defun mixi-friend-hobby (friend)
  "Return the hobby of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (mixi-friend-realize friend)
  (aref (cdr friend) 10))

(defun mixi-friend-job (friend)
  "Return the job of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (mixi-friend-realize friend)
  (aref (cdr friend) 11))

(defun mixi-friend-organization (friend)
  "Return the organization of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (mixi-friend-realize friend)
  (aref (cdr friend) 12))

(defun mixi-friend-profile (friend)
  "Return the pforile of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (mixi-friend-realize friend)
  (aref (cdr friend) 13))

(defun mixi-friend-touch (friend)
  "Set the timestamp of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 0 (current-time)))

(defun mixi-friend-set-nick (friend nick)
  "Set the nick of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 2 nick))

(defun mixi-friend-set-name (friend name)
  "Set the name of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 3 name))

(defun mixi-friend-set-sex (friend sex)
  "Set the sex of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 4 sex))

(defun mixi-friend-set-address (friend address)
  "Set the address of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 5 address))

(defun mixi-friend-set-age (friend age)
  "Set the age of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 6 age))

(defun mixi-friend-set-birthday (friend birthday)
  "Set the birthday of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 7 birthday))

(defun mixi-friend-set-blood-type (friend blood-type)
  "Set the blood type of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 8 blood-type))

(defun mixi-friend-set-birthplace (friend birthplace)
  "Set the birthplace of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 9 birthplace))

(defun mixi-friend-set-hobby (friend hobby)
  "Set the hobby of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 10 hobby))

(defun mixi-friend-set-job (friend job)
  "Set the job of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 11 job))

(defun mixi-friend-set-organization (friend organization)
  "Set the organization of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 12 organization))

(defun mixi-friend-set-profile (friend profile)
  "Set the profile of FRIEND."
  (unless (mixi-friend-p friend)
    (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
  (aset (cdr friend) 13 profile))

(defmacro mixi-friend-list-page (&optional friend)
  `(concat "/list_friend.pl?page=%d"
	   (when ,friend (concat "&id=" (mixi-friend-id ,friend)))))

(defconst mixi-friend-list-id-regexp
  "<a href=show_friend\\.pl\\?id=\\([0-9]+\\)")
(defconst mixi-friend-list-nick-regexp
  "<td valign=middle>\\(.+\\)さん([0-9]+)<br />")

(defun mixi-get-friends (&rest args)
  "Get friends of FRIEND."
  (when (> (length args) 2)
    (signal 'wrong-number-of-arguments (list 'mixi-get-friends (length args))))
  (let ((friend (nth 0 args))
	(max-numbers (nth 1 args)))
    (when (or (not (mixi-friend-p friend)) (mixi-friend-p max-numbers))
      (setq friend (nth 1 args))
      (setq max-numbers (nth 0 args)))
    (unless (or (null friend) (mixi-friend-p friend))
      (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
    (let ((ids (mixi-get-matched-items (mixi-friend-list-page friend)
				       max-numbers
				       mixi-friend-list-id-regexp))
	  (nicks (mixi-get-matched-items (mixi-friend-list-page friend)
					 max-numbers
					 mixi-friend-list-nick-regexp)))
      (let ((index 0)
	    ret)
	(while (< index (length ids))
	  (setq ret (cons (mixi-make-friend (nth 0 (nth index ids))
					    (nth 0 (nth index nicks))) ret))
	  (incf index))
	(reverse ret)))))

;; Favorite.
(defmacro mixi-favorite-list-page ()
  `(concat "/list_bookmark.pl?page=%d"))

(defconst mixi-favorite-list-id-regexp
  "<td ALIGN=center BGCOLOR=#FDF9F2 width=330><a href=\"show_friend\\.pl\\?id=\\([0-9]+\\)\">")
(defconst mixi-favorite-list-nick-regexp
  "<td BGCOLOR=#FDF9F2><font COLOR=#996600>名&nbsp;&nbsp;前</font></td>
<td COLSPAN=2 BGCOLOR=#FFFFFF>\\(.+\\)</td></tr>")

(defun mixi-get-favorites (&optional max-numbers)
  "Get favorites."
  (let ((ids (mixi-get-matched-items (mixi-favorite-list-page)
				     max-numbers
				     mixi-favorite-list-id-regexp))
	(nicks (mixi-get-matched-items (mixi-favorite-list-page)
				       max-numbers
				       mixi-favorite-list-nick-regexp)))
    (let ((index 0)
	  ret)
      (while (< index (length ids))
	(setq ret (cons (mixi-make-friend (nth 0 (nth index ids))
					  (nth 0 (nth index nicks))) ret))
	(incf index))
      (reverse ret))))

;; Log object.
(defun mixi-make-log (friend time)
  "Return a log object."
  (cons 'mixi-log (vector friend time)))

(defmacro mixi-log-p (log)
  `(eq (mixi-object-class ,log) 'mixi-log))

(defun mixi-log-friend (log)
  "Return the friend of LOG."
  (unless (mixi-log-p log)
    (signal 'wrong-type-argument (list 'mixi-log-p log)))
  (aref (cdr log) 0))

(defun mixi-log-time (log)
  "Return the time of LOG."
  (unless (mixi-log-p log)
    (signal 'wrong-type-argument (list 'mixi-log-p log)))
  (aref (cdr log) 1))

(defmacro mixi-log-list-page ()
  `(concat "/show_log.pl"))

(defconst mixi-log-list-regexp
  "\\([0-9]+\\)年\\([0-9]+\\)月\\([0-9]+\\)日 \\([0-9]+\\):\\([0-9]+\\) <a href=\"show_friend\\.pl\\?id=\\([0-9]+\\)\">\\(.+\\)</a><br>")

(defun mixi-get-logs (&optional max-numbers)
  "Get logs."
  (let ((items (mixi-get-matched-items (mixi-log-list-page)
				       max-numbers
				       mixi-log-list-regexp)))
    (mapcar (lambda (item)
	      (mixi-make-log (mixi-make-friend (nth 5 item) (nth 6 item))
			     (encode-time 0
					  (string-to-number (nth 4 item))
					  (string-to-number (nth 3 item))
					  (string-to-number (nth 2 item))
					  (string-to-number (nth 1 item))
					  (string-to-number (nth 0 item)))))
	    items)))

;; Diary object.
(defvar mixi-diary-cache (make-hash-table :test 'equal))
(defun mixi-make-diary (owner id)
  "Return a diary object."
  (let ((owner (or owner (mixi-make-me))))
    (mixi-make-cache (list (mixi-friend-id owner) id)
		     (cons 'mixi-diary (vector nil owner id nil nil nil))
		     mixi-diary-cache)))

(defmacro mixi-diary-p (diary)
  `(eq (mixi-object-class ,diary) 'mixi-diary))

(defmacro mixi-diary-page (diary)
  `(concat "/view_diary.pl?id=" (mixi-diary-id ,diary)
	   "&owner_id=" (mixi-friend-id (mixi-diary-owner ,diary))))

;; FIXME: Remove `さん'.
(defconst mixi-diary-owner-nick-regexp
  "<td WIDTH=490 background=http://img\\.mixi\\.jp/img/bg_w\\.gif><b><font COLOR=#605048>\\(.+\\)\\(さん\\)?の日記</font></b></td>")
(defconst mixi-diary-time-regexp
  "<td ALIGN=center ROWSPAN=2 NOWRAP WIDTH=95 bgcolor=#FFD8B0>\\([0-9]+\\)年\\([0-9]+\\)月\\([0-9]+\\)日<br>\\([0-9]+\\):\\([0-9]+\\)</td>")
(defconst mixi-diary-title-regexp
  "<td BGCOLOR=#FFF4E0 WIDTH=430>&nbsp;\\([^<]+\\)</td></tr>")
(defconst mixi-diary-content-regexp
  "<td CLASS=h12>\\(.+\\)</td></tr>")

(defun mixi-diary-realize (diary)
  "Realize a DIARY."
  ;; FIXME: Check a expiration of cache?
  (unless (mixi-diary-realize-p diary)
    (with-mixi-retrieve (mixi-diary-page diary)
      (if (string-match mixi-diary-owner-nick-regexp buffer)
	  (mixi-friend-set-nick (mixi-diary-owner diary)
				(match-string 1 buffer))
	(signal 'error (list 'cannot-find-owner-nick diary)))
      (if (string-match mixi-diary-time-regexp buffer)
	  (mixi-diary-set-time
	   diary (encode-time 0 (string-to-number (match-string 5 buffer))
			      (string-to-number (match-string 4 buffer))
			      (string-to-number (match-string 3 buffer))
			      (string-to-number (match-string 2 buffer))
			      (string-to-number (match-string 1 buffer))))
	(signal 'error (list 'cannot-find-time diary)))
      (if (string-match mixi-diary-title-regexp buffer)
	  (mixi-diary-set-title diary (match-string 1 buffer))
	(signal 'error (list 'cannot-find-title diary)))
      (if (string-match mixi-diary-content-regexp buffer)
	  (mixi-diary-set-content diary (mixi-remove-markup
					 (match-string 1 buffer)))
	(signal 'error (list 'cannot-find-content diary))))
    (mixi-diary-touch diary)))

(defun mixi-diary-realize-p (diary)
  "Return the timestamp of DIARY."
  (unless (mixi-diary-p diary)
    (signal 'wrong-type-argument (list 'mixi-diary-p diary)))
  (aref (cdr diary) 0))

(defun mixi-diary-owner (diary)
  "Return the owner of DIARY."
  (unless (mixi-diary-p diary)
    (signal 'wrong-type-argument (list 'mixi-diary-p diary)))
  (aref (cdr diary) 1))

(defun mixi-diary-id (diary)
  "Return the id of DIARY."
  (unless (mixi-diary-p diary)
    (signal 'wrong-type-argument (list 'mixi-diary-p diary)))
  (aref (cdr diary) 2))

(defun mixi-diary-time (diary)
  "Return the time of DIARY."
  (unless (mixi-diary-p diary)
    (signal 'wrong-type-argument (list 'mixi-diary-p diary)))
  (mixi-diary-realize diary)
  (aref (cdr diary) 3))

(defun mixi-diary-title (diary)
  "Return the title of DIARY."
  (unless (mixi-diary-p diary)
    (signal 'wrong-type-argument (list 'mixi-diary-p diary)))
  (mixi-diary-realize diary)
  (aref (cdr diary) 4))

(defun mixi-diary-content (diary)
  "Return the content of DIARY."
  (unless (mixi-diary-p diary)
    (signal 'wrong-type-argument (list 'mixi-diary-p diary)))
  (mixi-diary-realize diary)
  (aref (cdr diary) 5))

(defun mixi-diary-touch (diary)
  "Set the timestamp of DIARY."
  (unless (mixi-diary-p diary)
    (signal 'wrong-type-argument (list 'mixi-diary-p diary)))
  (aset (cdr diary) 0 (current-time)))

(defun mixi-diary-set-time (diary time)
  "Set the time of DIARY."
  (unless (mixi-diary-p diary)
    (signal 'wrong-type-argument (list 'mixi-diary-p diary)))
  (aset (cdr diary) 3 time))

(defun mixi-diary-set-title (diary title)
  "Set the title of DIARY."
  (unless (mixi-diary-p diary)
    (signal 'wrong-type-argument (list 'mixi-diary-p diary)))
  (aset (cdr diary) 4 title))

(defun mixi-diary-set-content (diary content)
  "Set the content of DIARY."
  (unless (mixi-diary-p diary)
    (signal 'wrong-type-argument (list 'mixi-diary-p diary)))
  (aset (cdr diary) 5 content))

(defmacro mixi-diary-list-page (&optional friend)
  `(concat "/list_diary.pl?page=%d"
	   (when ,friend (concat "&id=" (mixi-friend-id ,friend)))))

(defconst mixi-diary-list-regexp
  "<a href=\"view_diary\\.pl\\?id=\\([0-9]+\\)&owner_id=[0-9]+\">")

(defun mixi-get-diaries (&rest args)
  "Get diaries of FRIEND."
  (when (> (length args) 2)
    (signal 'wrong-number-of-arguments (list 'mixi-get-friends (length args))))
  (let ((friend (nth 0 args))
	(max-numbers (nth 1 args)))
    (when (or (not (mixi-friend-p friend)) (mixi-friend-p max-numbers))
      (setq friend (nth 1 args))
      (setq max-numbers (nth 0 args)))
    (unless (or (null friend) (mixi-friend-p friend))
      (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
    (let ((items (mixi-get-matched-items (mixi-diary-list-page friend)
					 max-numbers
					 mixi-diary-list-regexp)))
      (mapcar (lambda (item)
		(mixi-make-diary friend (nth 0 item)))
	      items))))

(defmacro mixi-new-diary-list-page ()
  `(concat "/new_friend_diary.pl?page=%d"))

(defconst mixi-new-diary-list-regexp
  "<a class=\"new_link\" href=view_diary\\.pl\\?id=\\([0-9]+\\)&owner_id=\\([0-9]+\\)>")

(defun mixi-get-new-diaries (&optional max-numbers)
  "Get new diaries."
  (let ((items (mixi-get-matched-items (mixi-new-diary-list-page)
				       max-numbers
				       mixi-new-diary-list-regexp)))
    (mapcar (lambda (item)
	      (mixi-make-diary (mixi-make-friend (nth 1 item)) (nth 0 item)))
	    items)))

;; Community object.
(defvar mixi-community-cache (make-hash-table :test 'equal))
(defun mixi-make-community (id &optional name)
  "Return a community object."
  (mixi-make-cache id (cons 'mixi-community (vector nil id name nil nil nil
						    nil nil nil nil))
		   mixi-community-cache))

(defmacro mixi-community-p (community)
  `(eq (mixi-object-class ,community) 'mixi-community))

(defmacro mixi-community-page (community)
  `(concat "/view_community.pl?id=" (mixi-community-id ,community)))

(defconst mixi-community-nodata-regexp
  "^データがありません")
(defconst mixi-community-name-regexp
  "<td WIDTH=345>\\(.*\\)</td></tr>")
(defconst mixi-community-birthday-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>開設日</font></td>\n<td>\\([0-9]+\\)年\\([0-9]+\\)月\\([0-9]+\\)日</td>")
;; FIXME: Care when the owner has seceded.
(defconst mixi-community-owner-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>管理人</font></td>\n<td>\n\n<a href=\"\\(home\\.pl\\|show_friend\\.pl\\?id=\\([0-9]+\\)\\)\">\n\\(.+\\)</a>")
(defconst mixi-community-category-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>カテゴリ</font></td>\n<td>\\([^<]+\\)</td>")
(defconst mixi-community-members-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>メンバー数</font></td>\n<td>\\([0-9]+\\)人</td></tr>")
(defconst mixi-community-open-level-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>参加条件と<br>公開レベル</font></td>
<td>\\(.+\\)</td></tr>")
(defconst mixi-community-authority-regexp
  "<td BGCOLOR=#F2DDB7><font COLOR=#996600>トピック作成の権限</font></td>\n<td>\\(.+\\)</td></tr>")
(defconst mixi-community-description-regexp
  "<td CLASS=h120>\\(.+\\)</td>")

(defun mixi-community-realize (community)
  "Realize a COMMUNITY."
  ;; FIXME: Check a expiration of cache?
  (unless (mixi-community-realize-p community)
    (with-mixi-retrieve (mixi-community-page community)
      (if (string-match mixi-community-nodata-regexp buffer)
	  ;; FIXME: Set all members?
	  (mixi-community-set-name community "データがありません")
	(if (string-match mixi-community-name-regexp buffer)
	    (mixi-community-set-name community (match-string 1 buffer))
	  (signal 'error (list 'cannot-find-name community)))
	(if (string-match mixi-community-birthday-regexp buffer)
	    (mixi-community-set-birthday
	     community
	     (encode-time 0 0 0 (string-to-number (match-string 3 buffer))
			  (string-to-number (match-string 2 buffer))
			  (string-to-number (match-string 1 buffer))))
	  (signal 'error (list 'cannot-find-birthday community)))
	(if (string-match mixi-community-owner-regexp buffer)
	    (if (string= (match-string 1 buffer) "home.pl")
		(mixi-community-set-owner community (mixi-make-me))
	      (mixi-community-set-owner
	       community (mixi-make-friend (match-string 2 buffer)
					   (match-string 3 buffer))))
	  (signal 'error (list 'cannot-find-owner community)))
	(if (string-match mixi-community-category-regexp buffer)
	    (mixi-community-set-category community (match-string 1 buffer))
	  (signal 'error (list 'cannot-find-category community)))
	(if (string-match mixi-community-members-regexp buffer)
	    (mixi-community-set-members
	     community (string-to-number (match-string 1 buffer)))
	  (signal 'error (list 'cannot-find-members community)))
	(if (string-match mixi-community-open-level-regexp buffer)
	    (mixi-community-set-open-level community (match-string 1 buffer))
	  (signal 'error (list 'cannot-find-open-level community)))
	(if (string-match mixi-community-authority-regexp buffer)
	    (mixi-community-set-authority community (match-string 1 buffer))
	  (signal 'error (list 'cannot-find-authority community)))
	(if (string-match mixi-community-description-regexp buffer)
	    (mixi-community-set-description
	     community (mixi-remove-markup (match-string 1 buffer)))
	  (signal 'error (list 'cannot-find-description community)))))
    (mixi-community-touch community)))

(defun mixi-community-realize-p (community)
  "Return the timestamp of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (aref (cdr community) 0))

(defun mixi-community-id (community)
  "Return the id of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (aref (cdr community) 1))

(defun mixi-community-name (community)
  "Return the name of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (unless (aref (cdr community) 2)
    (mixi-community-realize community))
  (aref (cdr community) 2))

(defun mixi-community-birthday (community)
  "Return the birthday of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (mixi-community-realize community)
  (aref (cdr community) 3))

(defun mixi-community-owner (community)
  "Return the owner of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (mixi-community-realize community)
  (aref (cdr community) 4))

(defun mixi-community-category (community)
  "Return the category of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (mixi-community-realize community)
  (aref (cdr community) 5))

(defun mixi-community-members (community)
  "Return the members of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (mixi-community-realize community)
  (aref (cdr community) 6))

(defun mixi-community-open-level (community)
  "Return the open-level of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (mixi-community-realize community)
  (aref (cdr community) 7))

(defun mixi-community-authority (community)
  "Return the authority of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (mixi-community-realize community)
  (aref (cdr community) 8))

(defun mixi-community-description (community)
  "Return the description of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (mixi-community-realize community)
  (aref (cdr community) 9))

(defun mixi-community-touch (community)
  "Set the timestamp of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (aset (cdr community) 0 (current-time)))

(defun mixi-community-set-name (community name)
  "Set the name of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (aset (cdr community) 2 name))

(defun mixi-community-set-birthday (community birthday)
  "Set the birthday of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (aset (cdr community) 3 birthday))

(defun mixi-community-set-owner (community owner)
  "Set the owner of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (unless (mixi-friend-p owner)
    (signal 'wrong-type-argument (list 'mixi-friend-p owner)))
  (aset (cdr community) 4 owner))

(defun mixi-community-set-category (community category)
  "Set the category of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (aset (cdr community) 5 category))

(defun mixi-community-set-members (community members)
  "Set the name of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (aset (cdr community) 6 members))

(defun mixi-community-set-open-level (community open-level)
  "Set the name of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (aset (cdr community) 7 open-level))

(defun mixi-community-set-authority (community authority)
  "Set the name of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (aset (cdr community) 8 authority))

(defun mixi-community-set-description (community description)
  "Set the name of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (aset (cdr community) 9 description))

(defmacro mixi-community-list-page (&optional friend)
  `(concat "/list_community.pl?page=%d"
	   (when ,friend (concat "&id=" (mixi-friend-id ,friend)))))

(defconst mixi-community-list-id-regexp
  "<a href=view_community\\.pl\\?id=\\([0-9]+\\)")
(defconst mixi-community-list-name-regexp
  "<td valign=middle>\\(.+\\)([0-9]+)</td>")

(defun mixi-get-communities (&rest args)
  "Get communities of FRIEND."
  (when (> (length args) 2)
    (signal 'wrong-number-of-arguments (list 'mixi-get-friends (length args))))
  (let ((friend (nth 0 args))
	(max-numbers (nth 1 args)))
    (when (or (not (mixi-friend-p friend)) (mixi-friend-p max-numbers))
      (setq friend (nth 1 args))
      (setq max-numbers (nth 0 args)))
    (unless (or (null friend) (mixi-friend-p friend))
      (signal 'wrong-type-argument (list 'mixi-friend-p friend)))
    (let ((ids (mixi-get-matched-items (mixi-community-list-page friend)
				       max-numbers
				       mixi-community-list-id-regexp))
	  (names (mixi-get-matched-items (mixi-community-list-page friend)
					 max-numbers
					 mixi-community-list-name-regexp)))
      (let ((index 0)
	    ret)
	(while (< index (length ids))
	  (setq ret (cons (mixi-make-community (nth 0 (nth index ids))
					       (nth 0 (nth index names))) ret))
	  (incf index))
	(reverse ret)))))

;; Topic object.
(defvar mixi-topic-cache (make-hash-table :test 'equal))
(defun mixi-make-topic (community id)
  "Return a topic object."
  (mixi-make-cache (list (mixi-community-id community) id)
		   (cons 'mixi-topic (vector nil community id nil nil nil nil))
		   mixi-topic-cache))

(defmacro mixi-topic-p (topic)
  `(eq (mixi-object-class ,topic) 'mixi-topic))

(defmacro mixi-topic-page (topic)
  `(concat "/view_bbs.pl?id=" (mixi-topic-id ,topic)
	   "&comm_id=" (mixi-community-id (mixi-topic-community ,topic))))

(defconst mixi-topic-time-regexp
  "<td rowspan=\"3\" width=\"110\" bgcolor=\"#ffd8b0\" align=\"center\" valign=\"top\" nowrap>\\([0-9]+\\)年\\([0-9]+\\)月\\([0-9]+\\)日<br>\\([0-9]+\\):\\([0-9]+\\)</td>")
(defconst mixi-topic-title-regexp
  "<td bgcolor=\"#fff4e0\">&nbsp;\\([^<]+\\)</td>")
;; FIXME: Remove `さん'.
(defconst mixi-topic-owner-regexp
  "<td bgcolor=\"#fdf9f2\">&nbsp;<font color=\"#dfb479\"></font>&nbsp;<a href=\"show_friend\\.pl\\?id=\\([0-9]+\\)\">\\(.+\\)\\(さん\\)?</a>")
(defconst mixi-topic-content-regexp
  "<td class=\"h120\"><table><tr>\\(.+\\)?</tr></table>\\(.+\\)</td>")

(defun mixi-topic-realize (topic)
  "Realize a TOPIC."
  ;; FIXME: Check a expiration of cache?
  (unless (mixi-topic-realize-p topic)
    (with-mixi-retrieve (mixi-topic-page topic)
      (if (string-match mixi-topic-time-regexp buffer)
	  (mixi-topic-set-time
	   topic (encode-time 0 (string-to-number (match-string 5 buffer))
			      (string-to-number (match-string 4 buffer))
			      (string-to-number (match-string 3 buffer))
			      (string-to-number (match-string 2 buffer))
			      (string-to-number (match-string 1 buffer))))
	(signal 'error (list 'cannot-find-time topic)))
      (if (string-match mixi-topic-title-regexp buffer)
	  (mixi-topic-set-title topic (match-string 1 buffer))
	(signal 'error (list 'cannot-find-title topic)))
      (if (string-match mixi-topic-owner-regexp buffer)
	  (mixi-topic-set-owner topic
				(mixi-make-friend (match-string 1 buffer)
						  (match-string 2 buffer)))
	(signal 'error (list 'cannot-find-owner topic)))
      (if (string-match mixi-topic-content-regexp buffer)
	  (mixi-topic-set-content topic (mixi-remove-markup
					 (match-string 2 buffer)))
	(signal 'error (list 'cannot-find-content topic))))
    (mixi-topic-touch topic)))

(defun mixi-topic-realize-p (topic)
  "Return the timestamp of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (aref (cdr topic) 0))

(defun mixi-topic-community (topic)
  "Return the community of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (aref (cdr topic) 1))

(defun mixi-topic-id (topic)
  "Return the id of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (aref (cdr topic) 2))

(defun mixi-topic-time (topic)
  "Return the time of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (mixi-topic-realize topic)
  (aref (cdr topic) 3))

(defun mixi-topic-title (topic)
  "Return the title of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (mixi-topic-realize topic)
  (aref (cdr topic) 4))

(defun mixi-topic-owner (topic)
  "Return the owner of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (mixi-topic-realize topic)
  (aref (cdr topic) 5))

(defun mixi-topic-content (topic)
  "Return the content of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (mixi-topic-realize topic)
  (aref (cdr topic) 6))

(defun mixi-topic-touch (topic)
  "Set the timestamp of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (aset (cdr topic) 0 (current-time)))

(defun mixi-topic-set-time (topic time)
  "Set the time of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (aset (cdr topic) 3 time))

(defun mixi-topic-set-title (topic title)
  "Set the title of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (aset (cdr topic) 4 title))

(defun mixi-topic-set-owner (topic owner)
  "Set the owner of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (unless (mixi-friend-p owner)
    (signal 'wrong-type-argument (list 'mixi-friend-p owner)))
  (aset (cdr topic) 5 owner))

(defun mixi-topic-set-content (topic content)
  "Set the content of TOPIC."
  (unless (mixi-topic-p topic)
    (signal 'wrong-type-argument (list 'mixi-topic-p topic)))
  (aset (cdr topic) 6 content))

(defmacro mixi-topic-list-page (community)
  `(concat "/list_bbs.pl?page=%d"
	   "&id=" (mixi-community-id ,community)))

(defconst mixi-topic-list-regexp
  "<a href=view_bbs\\.pl\\?id=\\([0-9]+\\)")

(defun mixi-get-topics (community &optional max-numbers)
  "Get topics of COMMUNITY."
  (unless (mixi-community-p community)
    (signal 'wrong-type-argument (list 'mixi-community-p community)))
  (let ((items (mixi-get-matched-items (mixi-topic-list-page community)
				       max-numbers
				       mixi-topic-list-regexp)))
    (mapcar (lambda (item)
	      (mixi-make-topic community (nth 0 item)))
	    items)))

(defmacro mixi-new-topic-list-page ()
  `(concat "/new_bbs.pl?page=%d"))

(defconst mixi-new-topic-list-regexp
  "<a href=\"view_bbs\\.pl\\?id=\\([0-9]+\\)&comment_count=[0-9]+&comm_id=\\([0-9]+\\)\" class=\"new_link\">")

(defun mixi-get-new-topics (&optional max-numbers)
  "Get new topics."
  (let ((items (mixi-get-matched-items (mixi-new-topic-list-page)
				       max-numbers
				       mixi-new-topic-list-regexp)))
    (mapcar (lambda (item)
	      (mixi-make-topic (mixi-make-community (nth 1 item))
			       (nth 0 item)))
	    items)))

;; Comment object.
(defun mixi-make-comment (parent owner time content)
  "Return a comment object."
  (cons 'mixi-comment (vector parent owner time content)))

(defmacro mixi-comment-p (comment)
  `(eq (mixi-object-class ,comment) 'mixi-comment))

(defun mixi-comment-parent (comment)
  "Return the parent of COMMENT."
  (unless (mixi-comment-p comment)
    (signal 'wrong-type-argument (list 'mixi-comment-p comment)))
  (aref (cdr comment) 0))

(defun mixi-comment-owner (comment)
  "Return the owner of COMMENT."
  (unless (mixi-comment-p comment)
    (signal 'wrong-type-argument (list 'mixi-comment-p comment)))
  (aref (cdr comment) 1))

(defun mixi-comment-time (comment)
  "Return the time of COMMENT."
  (unless (mixi-comment-p comment)
    (signal 'wrong-type-argument (list 'mixi-comment-p comment)))
  (aref (cdr comment) 2))

(defun mixi-comment-content (comment)
  "Return the content of COMMENT."
  (unless (mixi-comment-p comment)
    (signal 'wrong-type-argument (list 'mixi-comment-p comment)))
  (aref (cdr comment) 3))

(defun mixi-diary-comment-list-page (diary)
  (concat "/view_diary.pl?page=%d"
	  "&id=" (mixi-diary-id diary)
	  "&owner_id=" (mixi-friend-id (mixi-diary-owner diary))))

;; FIXME: Split regexp to time, owner(id and nick) and contents.
(defconst mixi-diary-comment-list-regexp
"<td rowspan=\"2\" align=\"center\" width=\"95\" bgcolor=\"#f2ddb7\" nowrap>
\\([0-9]+\\)年\\([0-9]+\\)月\\([0-9]+\\)日<br>\\([0-9]+\\):\\([0-9]+\\)\\(<br>
<input type=checkbox name=comment_id value=\".+\">
\\|\\)
</td>
<td ALIGN=center BGCOLOR=#FDF9F2 WIDTH=430>
<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\" width=\"410\">
<tr>
<td>
<a href=\"show_friend\\.pl\\?id=\\([0-9]+\\)\">\\(.+\\)</a>

</td>
</tr>
</table>
</td>
</tr>
<!-- 本文 : start -->
<tr>
<td bgcolor=\"#ffffff\">
<table BORDER=0 CELLSPACING=0 CELLPADDING=[35] WIDTH=410>
<tr>
<td CLASS=h12>
\\(.+\\)
</td></tr></table>")

(defun mixi-topic-comment-list-page (topic)
  (concat "/view_bbs.pl?page=%d"
	  "&id=" (mixi-topic-id topic)
	  "&comm_id=" (mixi-community-id (mixi-topic-community topic))))

;; FIXME: Split regexp to time, owner(id and nick) and contents.
(defconst mixi-topic-comment-list-regexp
  "<tr valign=\"top\">
<td rowspan=\"2\" width=\"110\" bgcolor=\"#f2ddb7\" align=\"center\" nowrap>
\\([0-9]+\\)年\\([0-9]+\\)月\\([0-9]+\\)日<br>
\\([0-9]+\\):\\([0-9]+\\)<br>
\\(</td>\\)
<td bgcolor=\"#fdf9f2\">&nbsp;<font color=\"#f8a448\">
<b>&nbsp;&nbsp;[0-9]+</b>:</font>&nbsp;

<a href=\"show_friend\\.pl\\?id=\\([0-9]+\\)\">\\(.+\\)</a>



</td>
</tr>
<tr>
<td bgcolor=\"#ffffff\" align=\"center\">
<table border=\"0\" cellspacing=\"0\" cellpadding=\"5\" width=\"500\">
<tr>
<td class=\"h120\">

\\(.+\\)
</td>
</tr>
</table>
</td>
</tr>")

(defun mixi-get-comments (parent &optional max-numbers)
  "Get comments of PARENT."
  (unless (mixi-object-p parent)
    (signal 'wrong-type-argument (list 'mixi-object-p parent)))
  (let* ((name (mixi-object-name parent))
	 (list-page (intern (concat mixi-object-prefix name
				    "-comment-list-page")))
	 (regexp (eval (intern (concat mixi-object-prefix name
				       "-comment-list-regexp")))))
    (let ((items (mixi-get-matched-items
		  (funcall list-page parent) max-numbers regexp)))
      (mapcar (lambda (item)
		(mixi-make-comment parent (mixi-make-friend
					   (nth 6 item) (nth 7 item))
				   (encode-time
				    0
				    (string-to-number (nth 4 item))
				    (string-to-number (nth 3 item))
				    (string-to-number (nth 2 item))
				    (string-to-number (nth 1 item))
				    (string-to-number (nth 0 item)))
				   (mixi-remove-markup (nth 8 item))))
	      items))))

(defmacro mixi-new-comment-list-page ()
  `(concat "/new_comment.pl?page=%d"))

(defconst mixi-new-comment-list-regexp
  "<a href=\"view_diary\\.pl\\?id=\\([0-9]+\\)&owner_id=\\([0-9]+\\)&comment_count=[0-9]+\" class=\"new_link\">")

(defun mixi-get-new-comments (&optional max-numbers)
  "Get new comments."
  (let ((items (mixi-get-matched-items (mixi-new-comment-list-page)
				       max-numbers
				       mixi-new-comment-list-regexp)))
    (mapcar (lambda (item)
	      (let ((diary (mixi-make-diary
			    (mixi-make-friend (nth 1 item))
			    (nth 0 item))))
		(mixi-get-comments diary)))
	    items)))

(provide 'mixi)

;;; mixi.el ends here