;;; mew-imap2.el for appending

;; Author:  Kazu Yamamoto <Kazu@Mew.org>
;; Created: May 22, 2003

;;; Code:

(require 'mew)

(defvar mew-imap2-literal+ t)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; IMAP2 info
;;;

(defvar mew-imap2-info-list
  '("case" "directive" "mailbox"
    ;;
    "src" "messages" "src-list" "src-list-orig"
    "server" "port" "ssh-server"
    "user" "auth" "auth-list" "account"
    "status" "process" "ssh-process" "ssl-process"
    "cnt" "ttl" "literal+"
    ;; parameters used internally and should be initialized
    "tag" "string" "error" "auth-selected" "authl" "aux" "done"))

(defvar mew-imap2-info-list-clean-length 20)

(mew-info-defun "mew-imap2-" mew-imap2-info-list)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; FSM
;;;

(defvar mew-imap2-fsm
  '(("greeting"      ("OK" . "capability"))
    ("capability"    ("OK" . "post-capability"))
    ("auth-xoauth2"  ("OK" .  "next") ("NO" . "xoauth2-wpwd"))
    ("auth-cram-md5" ("OK" . "pwd-cram-md5") ("NO" . "wpwd"))
    ("pwd-cram-md5"  ("OK" . "next") ("NO" . "wpwd"))
    ("auth-login"    ("OK" . "user-login") ("NO" . "wpwd"))
    ("user-login"    ("OK" . "pwd-login") ("NO" . "wpwd"))
    ("pwd-login"     ("OK" . "next") ("NO" . "wpwd"))
    ("login"         ("OK" . "next") ("NO" . "wpwd"))
    ("append"        ("OK" . "post-append") ("\\[TRYCREATE\\]" . "create"))
    ("create"        ("OK" . "append") ("NO" . "wmbx"))
    ("post-append"   ("OK" . "done") ("\\[TRYCREATE\\]" . "create"))
    ("logout"        ("OK" . "noop"))))

(defun mew-imap2-fsm-by-status (status)
  (assoc status mew-imap2-fsm))

(defun mew-imap2-fsm-next (status code)
  (cdr (mew-assoc-match2 code (nthcdr 1 (mew-imap2-fsm-by-status status)) 0)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Filters 2
;;;

(defun mew-imap2-command-capability (pro pnm)
  (mew-imap2-process-send-string pro pnm "CAPABILITY"))

(defun mew-imap2-command-post-capability (pro pnm)
  (let ((case-fold-search t)
	(aux (mew-imap2-get-aux pnm))
	(start 0)
	authl literal+)
    (while (string-match "AUTH=\\([^ \r\n]+\\)" aux start)
      (setq authl (cons (mew-match-string 1 aux) authl))
      (setq start (match-end 0)))
    (if (and mew-imap2-literal+
	     (string-match "\\bliteral\\+\\b" aux))
	(setq literal+ t))
    (mew-imap2-set-authl pnm authl)
    (mew-imap2-set-literal+ pnm literal+)
    (mew-imap2-set-status pnm "authentication")
    (mew-imap2-command-authentication pro pnm)))

(defun mew-imap2-command-authentication (pro pnm)
  (cond
   ((eq (mew-imap2-get-auth pnm) t) ;; t means SASL
    (let ((auth-list (mew-imap2-get-auth-list pnm))
	  (authl (mew-imap2-get-authl pnm))
	  auth func)
      (if (and authl
	       (setq auth (mew-auth-select2 authl auth-list))
	       (setq func (mew-imap2-auth-get-func auth))
	       (fboundp func))
	  (progn
	    (mew-imap2-set-auth-selected pnm auth)
	    (funcall func pro pnm))
	(mew-imap2-debug "<AUTH>" "No preferred IMAP AUTH.\n")
	(mew-imap2-set-status pnm "login")
	(mew-imap2-command-login pro pnm))))
   (t
    (mew-imap2-set-status pnm "login")
    (mew-imap2-command-login pro pnm))))

(defun mew-imap2-command-login (pro pnm)
  (let* ((user (mew-imap2-get-user pnm))
         (prompt (format "IMAP password (%s): "
                         (mew-imap2-get-account pnm)))
         (pass (mew-input-passwd prompt (mew-imap2-passtag pnm))))
    (setq user (mew-quote-string user ?\\ '(?\\ ?\")))
    (setq pass (mew-quote-string pass ?\\ '(?\\ ?\")))
    (mew-imap2-process-send-string pro pnm "LOGIN \"%s\" \"%s\"" user pass)))

(defun mew-imap2-command-wpwd (pro pnm)
  (let ((auth (mew-imap2-get-auth-selected pnm)))
    (mew-passwd-set-passwd (mew-imap2-passtag pnm) nil)
    (mew-imap2-set-error pnm (format "IMAP %s password is wrong!" auth))
    (mew-imap2-command-logout2 pro pnm)))

(defun mew-imap2-command-next (pro pnm)
  (let ((directive (mew-imap2-get-directive pnm))
	(case (mew-imap2-get-case pnm))
	(src-list (mew-imap2-get-src-list pnm))
	(msgs (mew-imap2-get-messages pnm))
	src dst mailbox msg src-file)
    (if msgs
	(setq src (mew-imap2-get-src pnm))
      (if (or (eq directive 'copy) (eq directive 'move))
	  (progn
	    (setq msgs src-list)
	    (mew-imap2-set-src-list pnm nil)
	    (mew-imap2-set-ttl pnm (length msgs))
	    (mew-imap2-set-cnt pnm 0)
	    (setq dst (mew-imap2-get-mailbox pnm))
	    (setq mailbox (mew-imap-expand-mailbox case dst))
	    (setq mailbox (mew-imap-utf-7-encode-string mailbox))
	    (mew-imap2-set-mailbox pnm mailbox))
	(catch 'break
	  (while src-list ;; cannot use dolist
	    (setq src (car src-list))
	    (setq src-list (cdr src-list))
	    (mew-imap2-set-src pnm src)
	    (mew-imap2-set-src-list pnm src-list)
	    (setq msgs (mew-folder-messages (mew-case-folder case src)))
	    (when msgs
	      (mew-imap2-set-ttl pnm (length msgs))
	      (mew-imap2-set-cnt pnm 0)
	      (cond
	       ((eq directive 'cp-r)
		(setq dst (mew-imap-local-to-imap case src))
		(unless (assoc dst (mew-imap-folder-alist case))
		  (mew-imap-folder-insert case dst))
		(setq mailbox (mew-imap-expand-mailbox case dst)))
	       ((eq directive 'fcc)
		(setq mailbox (mew-imap-fcc-to-mailbox case src))))
	      (setq mailbox (mew-imap-utf-7-encode-string mailbox))
	      (mew-imap2-set-mailbox pnm mailbox)
	      (throw 'break nil))))))
    (if msgs
	(progn
	  (setq msg (car msgs))
	  (setq msgs (cdr msgs))
	  (cond
	   ((or (eq directive 'copy) (eq directive 'move))
	    (setq src-file msg))
	   (t
	    (setq src-file (mew-expand-msg (mew-case-folder case src) msg))))
	  (mew-frwlet mew-cs-text-for-read mew-cs-dummy
	    (set-buffer (mew-find-file-noselect src-file)))
	  (mew-set-buffer-multibyte nil)
	  (mew-info-clean-up pnm mew-imap2-info-list-clean-length)
	  (mew-imap2-set-messages pnm msgs)
	  (set-process-buffer pro (current-buffer))
	  (mew-imap2-set-status pnm "append")
	  (mew-imap2-command-append pro pnm))
      (mew-imap2-set-status pnm "logout")
      (mew-imap2-command-logout pro pnm))))

(defun mew-imap2-command-append (pro pnm)
  (let ((mailbox (mew-imap2-get-mailbox pnm))
	(cnt (mew-imap2-get-cnt pnm))
	(ttl (mew-imap2-get-ttl pnm))
	(mbx (mew-imap2-get-mailbox pnm))
	(literal+ (mew-imap2-get-literal+ pnm))
	bytes)
    (setq cnt (1+ cnt))
    (mew-imap2-set-cnt pnm cnt)
    (message "Copying to %s %d/%d (%02d%%)" mbx cnt ttl (/ (* cnt 100) ttl))
    (goto-char (point-max))
    (unless (bolp) (insert "\n"))
    (if (mew-eol-fix-for-write)
	(setq bytes (- (point-max) (point-min)))
      (setq bytes (- (point-max) (point-min)))
      (setq bytes (+ bytes (count-lines (point-min) (point-max)))))
    (set-buffer-modified-p nil)
    (if (not literal+)
	(mew-imap2-process-send-string
	 pro pnm "APPEND \"%s\" {%d}" mailbox bytes)
      (mew-imap2-process-send-string
       pro pnm "APPEND \"%s\" {%d+}" mailbox bytes)
      (mew-imap2-set-status pnm "post-append")
      (mew-imap2-command-post-append pro pnm))))

(defun mew-imap2-command-post-append (pro _pnm)
  (process-send-region pro (point-min) (point-max))
  (process-send-string pro mew-cs-eol)) ;; APPEND command ends

(defun mew-imap2-command-create (pro pnm)
  (let ((mailbox (mew-imap2-get-mailbox pnm))
	(cnt (mew-imap2-get-cnt pnm)))
    (setq cnt (1- cnt))
    (mew-imap2-set-cnt pnm cnt)
    (mew-imap2-process-send-string pro pnm "CREATE \"%s\"" mailbox)))

(defun mew-imap2-command-wmbx (pro pnm)
  (mew-imap2-set-error pnm "mailbox is wrong!")
  (mew-imap2-set-status pnm "logout")
  (mew-imap2-command-logout pro pnm))

(defun mew-imap2-command-done (pro pnm)
  (let ((buf (process-buffer pro)))
    (set-process-buffer pro nil)
    (mew-remove-buffer buf)
    (mew-imap2-set-status pro "next")
    (mew-imap2-command-next pro pnm)))

(defun mew-imap2-command-logout (pro pnm)
  (mew-imap2-set-done pnm t)
  (mew-imap2-process-send-string pro pnm "LOGOUT"))

(defun mew-imap2-command-logout2 (pro pnm)
  ;; error is set
  (mew-imap2-set-done pnm t)
  (when (and (processp pro) (eq (process-status pro) 'open))
    (mew-imap2-set-status pnm "logout")
    (mew-imap2-process-send-string pro pnm "LOGOUT")))

(defun mew-imap2-command-noop (_pro _pnm)
  ())

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; AUTH
;;;

(defvar mew-imap2-auth-alist
  '(("CRAM-MD5" mew-imap2-command-auth-cram-md5)
    ("LOGIN"    mew-imap2-command-auth-login)
    ("XOAUTH2"  mew-imap2-command-auth-xoauth2)))

(defun mew-imap2-auth-get-func (auth)
  (nth 1 (mew-assoc-case-equal auth mew-imap2-auth-alist 0)))

(defun mew-imap2-command-auth-cram-md5 (pro pnm)
  (mew-imap2-process-send-string pro pnm "AUTHENTICATE CRAM-MD5")
  (mew-imap2-set-status pnm "auth-cram-md5"))

(defun mew-imap2-command-pwd-cram-md5 (pro pnm)
  (let ((user (mew-imap2-get-user pnm))
        (prompt (format "IMAP CRAM-MD5 password (%s): "
                        (mew-imap2-get-account pnm)))
	(aux (mew-imap2-get-aux pnm))
	challenge passwd cram-md5)
    (if (string-match " \\([a-zA-Z0-9+/]+=*\\)" aux)
	(setq challenge (mew-match-string 1 aux)))
    (setq passwd (mew-imap2-input-passwd prompt pnm))
    (setq cram-md5 (mew-cram-md5 user passwd challenge))
    (mew-imap2-process-send-string2 pro cram-md5)))

(defun mew-imap2-command-auth-login (pro pnm)
  (mew-imap2-process-send-string pro pnm "AUTHENTICATE LOGIN")
  (mew-imap2-set-status pnm "auth-login"))

(defun mew-imap2-command-user-login (pro pnm)
  (let* ((user (mew-imap2-get-user pnm))
	 (euser (mew-base64-encode-string user)))
    (mew-imap2-process-send-string2 pro euser)))

(defun mew-imap2-command-pwd-login (pro pnm)
  (let* ((prompt (format "IMAP LOGIN password (%s): "
                        (mew-imap2-get-account pnm)))
         (passwd (mew-imap2-input-passwd prompt pnm))
         (epasswd (mew-base64-encode-string passwd)))
    (mew-imap2-process-send-string2 pro epasswd)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Sub functions
;;;

(defconst mew-imap2-info-prefix "mew-imap2-info-")

(defun mew-imap2-info-name (case)
  (let ((server (mew-imap-server case))
	(port (mew-*-to-string (mew-imap-port case)))
	(sshsrv (mew-imap-ssh-server case))
	(name mew-imap2-info-prefix))
    (setq name (concat name server))
    (unless (mew-port-equal port mew-imap-port)
      (setq name (concat name ":" port)))
    (if sshsrv
	(concat name "%" sshsrv)
      name)))

(defun mew-imap2-buffer-name (pnm)
  (concat mew-buffer-prefix pnm))

(defun mew-imap2-process-send-string (pro pnm &rest args)
  (let ((str (apply 'format args))
	(tag (mew-imap2-tag)))
    (mew-imap2-debug "=SEND=" (concat tag " " str))
    (mew-imap2-set-tag pnm tag)
    (if (and (processp pro) (eq (process-status pro) 'open))
	(process-send-string pro (concat tag " " str mew-cs-eol))
      (message "IMAP time out"))))

(defun mew-imap2-process-send-string2 (pro &rest args)
  (let ((str (apply 'format args)))
    (if (and (processp pro) (eq (process-status pro) 'open))
	(process-send-string pro (concat str mew-cs-eol))
      (message "IMAP time out"))))

(defun mew-imap2-tag ()
  (format "%s%04d" (mew-random-string 4 nil) (% (mew-random) 10000)))

(defun mew-imap2-passtag (pnm)
  (let ((server (mew-imap2-get-server pnm))
	(port (mew-imap2-get-port pnm))
	(user (mew-imap2-get-user pnm)))
    (concat user "@" server ":" port)))

(defun mew-imap2-passtag2 (case)
  (let ((server (mew-imap-server case))
	(port (mew-imap-port case))
	(user (mew-imap-user case)))
    (concat user "@" server ":" port)))

(defun mew-imap2-input-passwd (prompt pnm)
  (let* ((tag (mew-imap2-passtag pnm))
	 (pro (mew-imap2-get-process pnm))
	 (pass (mew-input-passwd prompt tag)))
    (unless (and (processp pro) (eq (process-status pro) 'open))
      (mew-passwd-set-passwd tag nil))
    pass))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Namespace
;;;


(defvar mew-folder-imap-fcc-prefix "%.fcc")

(defun mew-folder-imap-to-fcc (case folder)
  (concat
   (file-name-as-directory
    (mew-case-folder case mew-folder-imap-fcc-prefix))
   (mew-folder-string folder)))

(defun mew-folder-imap-fcc-dir (case)
  (mew-expand-folder (mew-case-folder case mew-folder-imap-fcc-prefix)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Opening IMAP
;;;

(defun mew-imap2-open (pnm case server port starttlsp)
  (let ((sprt (mew-*-to-port port))
	(sslnp (mew-ssl-native-p (mew-imap-ssl case)))
	pro tm)
    (condition-case emsg
	(progn
	  (setq tm (run-at-time mew-imap-timeout-time nil 'mew-imap2-timeout))
	  (message "Connecting to the IMAP server...")
	  (setq pro (mew-open-network-stream pnm nil server sprt
					     'imap sslnp starttlsp case))
	  (setq pro (car pro))
	  (when (not (processp pro)) (signal 'quit nil))
	  (mew-process-silent-exit pro)
	  (mew-set-process-cs pro mew-cs-text-for-net mew-cs-text-for-net)
	  (message "Connecting to the IMAP server...done"))
      (quit
       (setq pro nil)
       (message "Cannot connect to the IMAP server"))
      (error
       (setq pro nil)
       (message "%s, %s" (nth 1 emsg) (nth 2 emsg))))
    (if tm (cancel-timer tm))
    pro))

(defun mew-imap2-timeout ()
  ;; Do not timeout if the NSM query pane is active.
  (unless (get-buffer "*Network Security Manager*")
    (message "IMAP connection timed out (%d seconds)"
	     mew-imap-timeout-time)
    (signal 'quit nil)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Launcher
;;;

(defun mew-imap2-copy-message (case directive src-list &optional dst)
  (let* ((server (mew-imap-server case))
         (user (mew-imap-user case))
	 (port (mew-*-to-string (mew-imap-port case)))
	 (pnm (mew-imap2-info-name case))
	 (sshsrv (mew-imap-ssh-server case))
	 (sslp (mew-imap-ssl case))
	 (sslport (mew-imap-ssl-port case))
	 (sslnp (mew-ssl-native-p (mew-imap-ssl case)))
	 (starttlsp
	  (mew-ssl-starttls-p (mew-imap-ssl case)
			      (mew-*-to-string (mew-imap-port case))
			      (mew-imap-ssl-port case)))
	 (proxysrv (mew-imap-proxy-server case))
	 (proxyport (mew-imap-proxy-port case))
	 process sshname sshpro sslname sslpro lport tls)
    (cond
     (sslnp
      (let ((serv (if starttlsp port sslport)))
	(setq process (mew-imap2-open pnm case server serv starttlsp))))
     (sshsrv
      (setq sshpro (mew-open-ssh-stream case server port sshsrv))
      (when sshpro
	(setq sshname (process-name sshpro))
	(setq lport (mew-ssh-pnm-to-lport sshname))
	(when lport
	  (setq process (mew-imap2-open pnm case "localhost" lport nil)))))
     (sslp
      (when starttlsp (setq tls mew-tls-imap))
      (setq sslpro (mew-open-ssl-stream case server sslport tls))
      (when sslpro
	(setq sslname (process-name sslpro))
	(setq lport (mew-ssl-pnm-to-lport sslname))
	(when lport
	  (setq process (mew-imap2-open pnm case mew-ssl-localhost lport nil)))))
     (proxysrv
      (setq process (mew-imap2-open pnm case proxysrv proxyport nil)))
     (t
      (setq process (mew-imap2-open pnm case server port nil))))
    (if (null process)
	(cond
	 ((and sshsrv (null sshpro))
	  (message "Cannot create to the SSH connection"))
	 ((and sslp (null sslpro))
	  (message "Cannot create to the SSL/TLS connection"))
	 (t
	  (message "Cannot connect to the IMAP server")))
      (mew-info-clean-up pnm)
      (mew-imap2-set-case pnm case)
      (mew-imap2-set-directive pnm directive)
      (mew-imap2-set-server pnm server)
      (mew-imap2-set-port pnm port)
      (mew-imap2-set-process pnm process)
      (mew-imap2-set-ssh-server pnm sshsrv)
      (mew-imap2-set-ssh-process pnm sshpro)
      (mew-imap2-set-ssl-process pnm sslpro)
      (mew-imap2-set-user pnm user)
      (mew-imap2-set-account pnm (format "%s@%s" user server))
      (mew-imap2-set-auth pnm (mew-imap-auth case))
      (mew-imap2-set-auth-list pnm (mew-imap-auth-list case))
      (mew-imap2-set-status pnm "greeting")
      (mew-imap2-set-src-list pnm src-list)
      (mew-imap2-set-src-list-orig pnm src-list)
      (mew-imap2-set-mailbox pnm dst)
      ;;
      (set-process-buffer process nil)
      (set-process-sentinel process 'mew-imap2-sentinel)
      (set-process-filter process 'mew-imap2-filter)
      (message "Copying in background...")
      (when sslnp
	;; GnuTLS requires a client-initiated command after the
	;; session is established or upgraded to use TLS because
	;; no additional greeting from the server.
	(mew-imap2-set-status pnm "capability")
	(mew-imap2-command-capability process pnm))
      )))

(defun mew-summary-from-local-to-imap ()
  "Copy messages in local folders under specified folder prefix
to a IMAP server decided by specified case. This may take very long
time (even several days) if there are many local messages."
  (interactive)
  (let* ((prefix (mew-input-local-folder mew-folder-local))
	 (case (mew-input-case mew-case-default "IMAP"))
	 (alist (mew-local-folder-alist))
	 regex src-list fld)
    (unless prefix (setq prefix mew-folder-local))
    (setq regex (concat "^" (regexp-quote prefix)))
    (dolist (ent alist)
      (setq fld (car ent))
      (if (string-match regex fld)
	  (setq src-list (cons fld src-list))))
    (setq src-list (nreverse src-list))
    (mew-imap2-copy-message case 'cp-r src-list)))

(defun mew-imap2-fcc (case)
  (let* ((prefix mew-folder-imap-fcc-prefix)
	 (fcc-dir (mew-folder-imap-fcc-dir case))
	 (fcc-dirs (mew-dir-list fcc-dir))
	 (src-list (mew-local-folder-make-alist fcc-dirs prefix 'make-list)))
    ;; src-list
    (mew-imap2-copy-message case 'fcc src-list)))

(defun mew-summary-imap-copy ()
  "Copy a message to the server side of IMAP."
  (interactive)
  (mew-summary-not-in-draft
   (let* ((fld (mew-summary-folder-name))
	  (msg (mew-summary-message-number))
	  (fld/msg (mew-expand-msg fld msg))
	  (src-list (list fld/msg))
	  (case:dst (mew-input-folder mew-case mew-imap-inbox-folder))
	  (case (mew-case:folder-case case:dst))
	  (dst (mew-case:folder-folder case:dst)))
     (when (mew-folder-imapp dst)
       (mew-imap2-copy-message case 'copy src-list dst)))))

(defun mew-summary-mark-imap-copy (&optional arg)
  "Copy messages marked with '*' to the server side of IMAP.
If called with '\\[universal-argument]', only messages marked
with '*' in the region are handled."
  (interactive "P")
  (mew-summary-not-in-draft
   (let* ((fld (mew-summary-folder-name))
	  (case:dst (mew-input-folder mew-case mew-imap-inbox-folder))
	  (case (mew-case:folder-case case:dst))
	  (dst (mew-case:folder-folder case:dst))
	  msgs beg end region src-list)
     (if (mew-mark-active-p) (setq arg t))
     (cond
      (arg
       (setq region (mew-summary-get-region))
       (setq beg (car region))
       (setq end (cdr region)))
      (t
       (setq beg (point-min))
       (setq end (point-max))))
     (setq msgs (mew-summary-mark-collect mew-mark-review beg end))
     (if (null msgs)
	 (message "No mark")
       (when (mew-folder-imapp dst)
	 (setq src-list (mapcar (lambda (x) (mew-expand-msg fld x)) msgs))
	 (mew-imap2-copy-message case 'copy src-list dst))))))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Filter and sentinel
;;;

(defun mew-imap2-debug (label string)
  (when (mew-debug 'net)
    (with-current-buffer (get-buffer-create mew-buffer-debug)
      (goto-char (point-max))
      (insert (format "\n<%s>\n%s\n" label string)))))

(defun mew-imap2-filter (process string)
  (let* ((pnm (process-name process))
	 (status (mew-imap2-get-status pnm))
	 (tag (mew-imap2-get-tag pnm))
	 (eos (format "^%s \\(OK\\|NO\\|BAD\\)\\(.*\\)" tag))
	 (str (concat (mew-imap2-get-string pnm) string))
	 (buf (process-buffer process))
	 aux stay next func code resp)
    (save-excursion
      (mew-imap2-debug (upcase (format "%s" status)) string)
      (if (and buf (get-buffer buf)) (set-buffer buf))
      (while (string-match "^\\*[^\n]*\n" str)
	(setq aux (substring str 0 (match-end 0)))
	(setq str (substring str (match-end 0)))
	(cond
	 ((string= status "greeting")
	  (setq next (mew-imap2-fsm-next "greeting" "OK")))
	 ((string= status "capability")
	  (mew-imap2-set-aux pnm (concat (mew-imap2-get-aux pnm) aux)))))
      (mew-imap2-set-string pnm str)
      (cond
       (next
	nil)
       ((string-match "^\\+ *\\(.*\\)" str)
	(mew-imap2-set-aux pnm str)
        (setq next (mew-imap2-fsm-next
                    status
                    (if (string= status "auth-xoauth2")
                        (mew-auth-xoauth2-json-status (mew-match-string 1))
                      "OK"))))
       ((string-match eos str)
	(mew-imap2-set-tag pnm nil)
	(setq code (mew-match-string 1 str))
	(setq resp (mew-match-string 2 str))
	(setq next (mew-imap2-fsm-next status code))
	(unless next (setq next (mew-imap2-fsm-next status resp))))
       (t
	(setq stay t)))
      (unless stay
	(unless next (setq next "logout"))
	(mew-imap2-set-status pnm next)
	(setq func (intern-soft (concat "mew-imap2-command-" next)))
	(if (fboundp func)
	    (funcall func process pnm)
	  (error "No function called %s" (symbol-name func)))
	(mew-imap2-set-string pnm nil)))))

(defun mew-imap2-sentinel (process event)
  (let* ((pnm (process-name process))
	 (directive (mew-imap2-get-directive pnm))
	 (case (mew-imap2-get-case pnm))
	 (done (mew-imap2-get-done pnm))
	 (error (mew-imap2-get-error pnm))
	 (sshpro (mew-imap2-get-ssh-process pnm))
	 (sslpro (mew-imap2-get-ssl-process pnm))
	 (srcflds (mew-imap2-get-src-list-orig pnm)))
    (save-excursion
      (mew-imap2-debug "IMAP SENTINEL" event)
      (cond
       (error
	(message "%s" error))
       (done
	(cond
	 ((eq directive 'fcc)
	  (dolist (srcfld srcflds)
	    (mew-imap2-copy-fcc-cache case srcfld))
	  (mew-delete-directory-recursively
	   (mew-folder-imap-fcc-dir case)))
	 ((eq directive 'move)
	  (let ((file (car (mew-imap2-get-src-list-orig pnm))))
	    (if (file-exists-p file) (delete-file file)))))
	(message "Copying in background...done"))
       (t
	(message "IMAP connection is lost")))
      (mew-info-clean-up pnm)
      (if (and (processp sshpro) (not mew-ssh-keep-connection))
	  (process-send-string sshpro "exit\n"))
      (if (and (processp sslpro) (not mew-ssl-keep-connection))
	  (delete-process sslpro))
      (run-hooks 'mew-imap2-sentinel-hook))))

(defun mew-imap2-copy-fcc-cache (case srcfld)
  (let* ((case:srcfld (mew-case-folder case srcfld))
	 (srcs (mew-folder-messages case:srcfld))
	 (prefix (file-name-as-directory mew-folder-imap-fcc-prefix))
	 (regex (concat "^" (regexp-quote prefix)))
	 dst dstfld case:dstfld i)
    (string-match regex srcfld)
    (setq dstfld (concat mew-folder-imap (substring srcfld (match-end 0))))
    (setq case:dstfld (mew-case-folder case dstfld))
    (mew-local-folder-check case:dstfld)
    (setq i (string-to-number (mew-folder-new-message case:dstfld 'num 'cache)))
    ;; to make code simple, we just copy the file.
    (dolist (src srcs)
      (setq dst (mew-i2s i 'cache))
      (copy-file (mew-expand-msg case:srcfld src)
		 (mew-expand-new-msg case:dstfld dst))
      (setq i (1+ i)))
    (mew-touch-folder case:dstfld)))

(provide 'mew-imap2)

;;; Copyright Notice:

;; Copyright (C) 2003-2020 Mew developing team.
;; All rights reserved.

;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions
;; are met:
;;
;; 1. Redistributions of source code must retain the above copyright
;;    notice, this list of conditions and the following disclaimer.
;; 2. Redistributions in binary form must reproduce the above copyright
;;    notice, this list of conditions and the following disclaimer in the
;;    documentation and/or other materials provided with the distribution.
;; 3. Neither the name of the team nor the names of its contributors
;;    may be used to endorse or promote products derived from this software
;;    without specific prior written permission.
;;
;; THIS SOFTWARE IS PROVIDED BY THE TEAM AND CONTRIBUTORS ``AS IS'' AND
;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
;; PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE TEAM OR CONTRIBUTORS BE
;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
;; BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
;; OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
;; IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

;;; mew-imap2.el ends here