/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */

#include <config.h>

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <errno.h>

#include <glib.h>

#include <gtk/gtk.h>
#include <libgnome/gnome-i18n.h>

#include <libedataserver/e-msgport.h>
#include <libedataserver/e-data-server-util.h>

#include <camel/camel-url.h>
#include <camel/camel-operation.h>

#include "misc/e-gui-utils.h"
#include "e-util/e-error.h"
#include "e-util/e-icon-factory.h"

#include "e-activity-handler.h"

#include "mail-config.h"
#include "mail-component.h"
#include "mail-session.h"
#include "mail-mt.h"

/*#define MALLOC_CHECK*/
#define LOG_OPS
#define LOG_LOCKS
#define d(x) 

static void set_stop(int sensitive);
static void mail_operation_status(struct _CamelOperation *op, const char *what, int pc, void *data);

#ifdef LOG_LOCKS
#define MAIL_MT_LOCK(x) (log_locks?fprintf(log, "%" G_GINT64_MODIFIER "x: lock " # x "\n", e_util_pthread_id(pthread_self())):0, pthread_mutex_lock(&x))
#define MAIL_MT_UNLOCK(x) (log_locks?fprintf(log, "%" G_GINT64_MODIFIER "x: unlock " # x "\n", e_util_pthread_id(pthread_self())): 0, pthread_mutex_unlock(&x))
#else
#define MAIL_MT_LOCK(x) pthread_mutex_lock(&x)
#define MAIL_MT_UNLOCK(x) pthread_mutex_unlock(&x)
#endif

/* background operation status stuff */
struct _mail_msg_priv {
	int activity_state;	/* sigh sigh sigh, we need to keep track of the state external to the
				   pointer itself for locking/race conditions */
	int activity_id;
};

static GdkPixbuf *progress_icon = NULL;

/* mail_msg stuff */
#ifdef LOG_OPS
static FILE *log;
static int log_ops, log_locks, log_init;
#endif

static unsigned int mail_msg_seq; /* sequence number of each message */
static GHashTable *mail_msg_active_table; /* table of active messages, must hold mail_msg_lock to access */
static pthread_mutex_t mail_msg_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t mail_msg_cond = PTHREAD_COND_INITIALIZER;

pthread_t mail_gui_thread;

MailAsyncEvent *mail_async_event;

static void mail_msg_destroy(EThread *e, EMsg *msg, void *data);

void *mail_msg_new(mail_msg_op_t *ops, EMsgPort *reply_port, size_t size)
{
	struct _mail_msg *msg;

	MAIL_MT_LOCK(mail_msg_lock);

#if defined(LOG_OPS) || defined(LOG_LOCKS)
	if (!log_init) {
		time_t now = time(0);

		log_init = TRUE;
		log_ops = getenv("EVOLUTION_MAIL_LOG_OPS") != NULL;
		log_locks = getenv("EVOLUTION_MAIL_LOG_LOCKS") != NULL;
		if (log_ops || log_locks) {
			log = fopen("evolution-mail-ops.log", "w+");
			if (log) {
				setvbuf(log, NULL, _IOLBF, 0);
				fprintf(log, "Started evolution-mail: %s\n", ctime(&now));
				g_warning("Logging mail operations to evolution-mail-ops.log");

				if (log_ops)
					fprintf(log, "Logging async operations\n");

				if (log_locks) {
					fprintf(log, "Logging lock operations, mail_gui_thread = %" G_GINT64_MODIFIER "x\n\n", e_util_pthread_id(mail_gui_thread));
					fprintf(log, "%" G_GINT64_MODIFIER "x: lock mail_msg_lock\n", e_util_pthread_id(pthread_self()));
				}
			} else {
				g_warning ("Could not open log file: %s", strerror(errno));
				log_ops = log_locks = FALSE;
			}
		}
	}
#endif
	msg = g_malloc0(size);
	msg->ops = ops;
	msg->seq = mail_msg_seq++;
	msg->msg.reply_port = reply_port;
	msg->cancel = camel_operation_new(mail_operation_status, GINT_TO_POINTER(msg->seq));
	camel_exception_init(&msg->ex);
	msg->priv = g_malloc0(sizeof(*msg->priv));

	g_hash_table_insert(mail_msg_active_table, GINT_TO_POINTER(msg->seq), msg);

	d(printf("New message %p\n", msg));

#ifdef LOG_OPS
	if (log_ops)
		fprintf(log, "%p: New\n", msg);
#endif
	MAIL_MT_UNLOCK(mail_msg_lock);

	return msg;
}


static void end_event_callback (CamelObject *o, void *event_data, void *data)
{
	EActivityHandler *activity_handler = mail_component_peek_activity_handler (mail_component_peek ());
	guint activity_id = GPOINTER_TO_INT (event_data);

	e_activity_handler_operation_finished (activity_handler, activity_id);
}


#ifdef MALLOC_CHECK
#include <mcheck.h>

static void
checkmem(void *p)
{
	if (p) {
		int status = mprobe(p);

		switch (status) {
		case MCHECK_HEAD:
			printf("Memory underrun at %p\n", p);
			abort();
		case MCHECK_TAIL:
			printf("Memory overrun at %p\n", p);
			abort();
		case MCHECK_FREE:
			printf("Double free %p\n", p);
			abort();
		}
	}
}
#endif

void mail_msg_free(void *msg)
{
	struct _mail_msg *m = msg;
	int activity_id;

#ifdef MALLOC_CHECK
	checkmem(m);
	checkmem(m->cancel);
	checkmem(m->priv);
#endif
	d(printf("Free message %p\n", msg));

	if (m->ops->destroy_msg)
		m->ops->destroy_msg(m);

	MAIL_MT_LOCK(mail_msg_lock);

#ifdef LOG_OPS
	if (log_ops)
		fprintf(log, "%p: Free  (exception `%s')\n", msg,
			camel_exception_get_description(&m->ex)?camel_exception_get_description(&m->ex):"None");
#endif
	g_hash_table_remove(mail_msg_active_table, GINT_TO_POINTER(m->seq));
	pthread_cond_broadcast(&mail_msg_cond);

	/* We need to make sure we dont lose a reference here YUCK YUCK */
	/* This is tightly integrated with the code in do_op_status,
	   as it closely relates to the CamelOperation setup in msg_new() above */
	if (m->priv->activity_state == 1) {
		m->priv->activity_state = 3; /* tell the other thread
					      * to free it itself (yuck yuck) */
		MAIL_MT_UNLOCK(mail_msg_lock);
		return;
	} else {
		activity_id = m->priv->activity_id;
	}

	MAIL_MT_UNLOCK(mail_msg_lock);

	if (m->cancel) {
		camel_operation_mute(m->cancel);
		camel_operation_unref(m->cancel);
	}

	camel_exception_clear(&m->ex);
	/*g_free(m->priv->what);*/
	g_free(m->priv);
	g_free(m);

	if (activity_id != 0)
		mail_async_event_emit(mail_async_event, MAIL_ASYNC_GUI, (MailAsyncFunc) end_event_callback,
				      NULL, GINT_TO_POINTER (activity_id), NULL);
}

/* hash table of ops->dialogue of active errors */
static GHashTable *active_errors = NULL;

static void error_destroy(GtkObject *o, void *data)
{
	g_hash_table_remove(active_errors, data);
}

static void error_response(GtkObject *o, int button, void *data)
{
	gtk_widget_destroy((GtkWidget *)o);
}

void mail_msg_check_error(void *msg)
{
	struct _mail_msg *m = msg;
	char *what;
	GtkDialog *gd;
	
#ifdef MALLOC_CHECK
	checkmem(m);
	checkmem(m->cancel);
	checkmem(m->priv);
#endif
	
	/* don't report any errors if we are not in interactive mode */
	if (!mail_session_get_interactive ())
		return;
	
	if (!camel_exception_is_set(&m->ex)
	    || m->ex.id == CAMEL_EXCEPTION_USER_CANCEL
	    || m->ex.id == CAMEL_EXCEPTION_FOLDER_INVALID_UID)
		return;

	if (active_errors == NULL)
		active_errors = g_hash_table_new(NULL, NULL);

	/* check to see if we have dialogue already running for this operation */
	/* we key on the operation pointer, which is at least accurate enough
	   for the operation type, although it could be on a different object. */
	if (g_hash_table_lookup(active_errors, m->ops)) {
		g_warning("Error occurred while existing dialogue active:\n%s", camel_exception_get_description(&m->ex));
		return;
	}

	if (m->ops->describe_msg
	    && (what = m->ops->describe_msg(m, FALSE))) {
		gd = (GtkDialog *)e_error_new(NULL, "mail:async-error", what, camel_exception_get_description(&m->ex), NULL);
		g_free(what);
	} else
		gd = (GtkDialog *)e_error_new(NULL, "mail:async-error-nodescribe", camel_exception_get_description(&m->ex), NULL);

	g_hash_table_insert(active_errors, m->ops, gd);
	g_signal_connect(gd, "response", G_CALLBACK(error_response), m->ops);
	g_signal_connect(gd, "destroy", G_CALLBACK(error_destroy), m->ops);
	gtk_widget_show((GtkWidget *)gd);
}

void mail_msg_cancel(unsigned int msgid)
{
	struct _mail_msg *m;

	MAIL_MT_LOCK(mail_msg_lock);
	m = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid));

	if (m && m->cancel)
		camel_operation_cancel(m->cancel);

	MAIL_MT_UNLOCK(mail_msg_lock);
}


/* waits for a message to be finished processing (freed)
   the messageid is from struct _mail_msg->seq */
void mail_msg_wait(unsigned int msgid)
{
	struct _mail_msg *m;
	int ismain = pthread_equal(pthread_self(), mail_gui_thread);

	if (ismain) {
		MAIL_MT_LOCK(mail_msg_lock);
		m = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid));
		while (m) {
			MAIL_MT_UNLOCK(mail_msg_lock);
			gtk_main_iteration();
			MAIL_MT_LOCK(mail_msg_lock);
			m = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid));
		}
		MAIL_MT_UNLOCK(mail_msg_lock);
	} else {
		MAIL_MT_LOCK(mail_msg_lock);
		m = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid));
		while (m) {
			pthread_cond_wait(&mail_msg_cond, &mail_msg_lock);
			m = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid));
		}
		MAIL_MT_UNLOCK(mail_msg_lock);
	}
}

int mail_msg_active(unsigned int msgid)
{
	int active;

	MAIL_MT_LOCK(mail_msg_lock);
	if (msgid == (unsigned int)-1) 
		active = g_hash_table_size(mail_msg_active_table) > 0;
	else
		active = g_hash_table_lookup(mail_msg_active_table, GINT_TO_POINTER(msgid)) != NULL;
	MAIL_MT_UNLOCK(mail_msg_lock);

	return active;
}

void mail_msg_wait_all(void)
{
	int ismain = pthread_equal(pthread_self(), mail_gui_thread);

	if (ismain) {
		MAIL_MT_LOCK(mail_msg_lock);
		while (g_hash_table_size(mail_msg_active_table) > 0) {
			MAIL_MT_UNLOCK(mail_msg_lock);
			gtk_main_iteration();
			MAIL_MT_LOCK(mail_msg_lock);
		}
		MAIL_MT_UNLOCK(mail_msg_lock);
	} else {
		MAIL_MT_LOCK(mail_msg_lock);
		while (g_hash_table_size(mail_msg_active_table) > 0) {
			pthread_cond_wait(&mail_msg_cond, &mail_msg_lock);
		}
		MAIL_MT_UNLOCK(mail_msg_lock);
	}
}

/* **************************************** */
struct _cancel_hook_data {
	struct _cancel_hook_data *next;
	struct _cancel_hook_data *prev;

	GDestroyNotify func;
	void *data;
};

static EDList cancel_hook_list = E_DLIST_INITIALISER(cancel_hook_list);

void *mail_cancel_hook_add(GDestroyNotify func, void *data)
{
	struct _cancel_hook_data *d;

	d = g_malloc0(sizeof(*d));
	d->func = func;
	d->data = data;

	MAIL_MT_LOCK(mail_msg_lock);
	e_dlist_addtail(&cancel_hook_list, (EDListNode *)d);
	MAIL_MT_UNLOCK(mail_msg_lock);

	return (void *)d;
}

void mail_cancel_hook_remove(void *handle)
{
	struct _cancel_hook_data *d = handle;

	MAIL_MT_LOCK(mail_msg_lock);
	e_dlist_remove((EDListNode *)d);
	MAIL_MT_UNLOCK(mail_msg_lock);
	g_free(d);
}

void mail_cancel_all(void)
{
	struct _cancel_hook_data *d, *n;

	camel_operation_cancel(NULL);

	/* I can ssee a deadlock coming on ... */
	MAIL_MT_LOCK(mail_msg_lock);
	d = (struct _cancel_hook_data *)cancel_hook_list.head;
	n = d->next;
	while (n) {
		d->func(d->data);
		d = n;
		n = n->next;
	}
	MAIL_MT_UNLOCK(mail_msg_lock);
}

EMsgPort		*mail_gui_port;
static GIOChannel	*mail_gui_channel;
static guint		 mail_gui_watch;

/* TODO: Merge these, gui_port2 doesn't do any mail_msg processing on the request (replies, forwards, frees) */
EMsgPort		*mail_gui_port2;
static GIOChannel	*mail_gui_channel2;
static guint		 mail_gui_watch2;

EMsgPort		*mail_gui_reply_port;
static GIOChannel	*mail_gui_reply_channel;

/* a couple of global threads available */
EThread *mail_thread_queued;	/* for operations that can (or should) be queued */
EThread *mail_thread_queued_slow;	/* for operations that can (or should) be queued, but take a long time */
EThread *mail_thread_new;	/* for operations that should run in a new thread each time */

static gboolean
mail_msgport_replied(GIOChannel *source, GIOCondition cond, void *d)
{
	EMsgPort *port = (EMsgPort *)d;
	mail_msg_t *m;

	while (( m = (mail_msg_t *)e_msgport_get(port))) {

#ifdef MALLOC_CHECK
		checkmem(m);
		checkmem(m->cancel);
		checkmem(m->priv);
#endif

#ifdef LOG_OPS
		if (log_ops)
			fprintf(log, "%p: Replied to GUI thread (exception `%s'\n", m,
				camel_exception_get_description(&m->ex)?camel_exception_get_description(&m->ex):"None");
#endif

		if (m->ops->reply_msg)
			m->ops->reply_msg(m);
		mail_msg_check_error(m);
		mail_msg_free(m);
	}

	return TRUE;
}

static gboolean
mail_msgport_received(GIOChannel *source, GIOCondition cond, void *d)
{
	EMsgPort *port = (EMsgPort *)d;
	mail_msg_t *m;

	while (( m = (mail_msg_t *)e_msgport_get(port))) {
#ifdef MALLOC_CHECK
		checkmem(m);
		checkmem(m->cancel);
		checkmem(m->priv);
#endif

#ifdef LOG_OPS
		if (log_ops)
			fprintf(log, "%p: Received at GUI thread\n", m);
#endif

		if (m->ops->receive_msg)
			m->ops->receive_msg(m);
		if (m->msg.reply_port)
			e_msgport_reply((EMsg *)m);
		else {
			if (m->ops->reply_msg)
				m->ops->reply_msg(m);
			mail_msg_free(m);
		}
	}

	return TRUE;
}

/* Test code, lighterwight, more configurable calls */
static gboolean
mail_msgport_received2(GIOChannel *source, GIOCondition cond, void *d)
{
	EMsgPort *port = (EMsgPort *)d;
	mail_msg_t *m;

	while (( m = (mail_msg_t *)e_msgport_get(port))) {
#ifdef LOG_OPS
		if (log_ops)
			fprintf(log, "%p: Received at GUI2 thread\n", m);
#endif

		if (m->ops->receive_msg)
			m->ops->receive_msg(m);
		else
			mail_msg_free(m);
	}

	return TRUE;
}


static void
mail_msg_destroy(EThread *e, EMsg *msg, void *data)
{
	mail_msg_t *m = (mail_msg_t *)msg;

#ifdef MALLOC_CHECK
	checkmem(m);
	checkmem(m->cancel);
	checkmem(m->priv);
#endif	

	mail_msg_free(m);
}

static void
mail_msg_received(EThread *e, EMsg *msg, void *data)
{
	mail_msg_t *m = (mail_msg_t *)msg;

#ifdef MALLOC_CHECK
	checkmem(m);
	checkmem(m->cancel);
	checkmem(m->priv);
#endif

	if (m->ops->describe_msg) {
		char *text = m->ops->describe_msg(m, FALSE);

#ifdef LOG_OPS
		if (log_ops)
			fprintf(log, "%p: Received at thread %" G_GINT64_MODIFIER "x: '%s'\n", m, e_util_pthread_id(pthread_self()), text);
#endif

		d(printf("message received at thread\n"));
		camel_operation_register(m->cancel);
		camel_operation_start(m->cancel, "%s", text);
		g_free(text);
	}
#ifdef LOG_OPS
	else
		if (log_ops)
			fprintf(log, "%p: Received at thread %" G_GINT64_MODIFIER "x\n", m, e_util_pthread_id(pthread_self()));
#endif

	if (m->ops->receive_msg) {
		mail_enable_stop();
		m->ops->receive_msg(m);
		mail_disable_stop();
	}

	if (m->ops->describe_msg) {
		camel_operation_end(m->cancel);
		camel_operation_unregister(m->cancel);
		MAIL_MT_LOCK(mail_msg_lock);
		camel_operation_unref(m->cancel);
		m->cancel = NULL;
		MAIL_MT_UNLOCK(mail_msg_lock);
	}
}

void mail_msg_cleanup(void)
{
	mail_msg_wait_all();

	e_thread_destroy(mail_thread_queued_slow);
	e_thread_destroy(mail_thread_queued);
	e_thread_destroy(mail_thread_new);

	g_io_channel_unref(mail_gui_channel);
	g_io_channel_unref(mail_gui_reply_channel);

	e_msgport_destroy(mail_gui_port);
	e_msgport_destroy(mail_gui_reply_port);
}

static guint
em_channel_setup(EMsgPort **port, GIOChannel **channel, GIOFunc func)
{
	GSource *source;
	guint id;

	*port = e_msgport_new();
#ifndef G_OS_WIN32
	*channel = g_io_channel_unix_new(e_msgport_fd(*port));
#else
	*channel = g_io_channel_win32_new_socket(e_msgport_fd(*port));
#endif
	source = g_io_create_watch(*channel, G_IO_IN);
	g_source_set_callback(source, (GSourceFunc)func, *port, NULL);
	g_source_set_can_recurse(source, FALSE);
	id = g_source_attach(source, NULL);
	g_source_unref(source);

	return id;
}

void mail_msg_init(void)
{
	em_channel_setup(&mail_gui_reply_port, &mail_gui_reply_channel, mail_msgport_replied);
	mail_gui_watch = em_channel_setup(&mail_gui_port, &mail_gui_channel, mail_msgport_received);
	mail_gui_watch2 = em_channel_setup(&mail_gui_port2, &mail_gui_channel2, mail_msgport_received2);

	mail_thread_queued = e_thread_new(E_THREAD_QUEUE);
	e_thread_set_msg_destroy(mail_thread_queued, mail_msg_destroy, 0);
	e_thread_set_msg_received(mail_thread_queued, mail_msg_received, 0);
	e_thread_set_reply_port(mail_thread_queued, mail_gui_reply_port);

	mail_thread_queued_slow = e_thread_new(E_THREAD_QUEUE);
	e_thread_set_msg_destroy(mail_thread_queued_slow, mail_msg_destroy, 0);
	e_thread_set_msg_received(mail_thread_queued_slow, mail_msg_received, 0);
	e_thread_set_reply_port(mail_thread_queued_slow, mail_gui_reply_port);

	mail_thread_new = e_thread_new(E_THREAD_NEW);
	e_thread_set_msg_destroy(mail_thread_new, mail_msg_destroy, 0);
	e_thread_set_msg_received(mail_thread_new, mail_msg_received, 0);
	e_thread_set_reply_port(mail_thread_new, mail_gui_reply_port);
	e_thread_set_queue_limit(mail_thread_new, 10);

	mail_msg_active_table = g_hash_table_new(NULL, NULL);
	mail_gui_thread = pthread_self();

	mail_async_event = mail_async_event_new();
}

/* ********************************************************************** */

/* locks */
static pthread_mutex_t status_lock = PTHREAD_MUTEX_INITIALIZER;

/* ********************************************************************** */

struct _proxy_msg {
	struct _mail_msg msg;
	MailAsyncEvent *ea;
	mail_async_event_t type;

	pthread_t thread;
	int have_thread;

	MailAsyncFunc func;
	void *o;
	void *event_data;
	void *data;
};

static void
do_async_event(struct _mail_msg *mm)
{
	struct _proxy_msg *m = (struct _proxy_msg *)mm;

	m->thread = pthread_self();
	m->have_thread = TRUE;
	m->func(m->o, m->event_data, m->data);
	m->have_thread = FALSE;

	g_mutex_lock(m->ea->lock);
	m->ea->tasks = g_slist_remove(m->ea->tasks, m);
	g_mutex_unlock(m->ea->lock);
}

static int
idle_async_event(void *mm)
{
	do_async_event(mm);
	mail_msg_free(mm);

	return FALSE;
}

static struct _mail_msg_op async_event_op = {
	NULL,
	do_async_event,
	NULL,
	NULL,
};

MailAsyncEvent *mail_async_event_new(void)
{
	MailAsyncEvent *ea;

	ea = g_malloc0(sizeof(*ea));
	ea->lock = g_mutex_new();

	return ea;
}

int mail_async_event_emit(MailAsyncEvent *ea, mail_async_event_t type, MailAsyncFunc func, void *o, void *event_data, void *data)
{
	struct _proxy_msg *m;
	int id;
	int ismain = pthread_equal(pthread_self(), mail_gui_thread);

	/* we dont have a reply port for this, we dont care when/if it gets executed, just queue it */
	m = mail_msg_new(&async_event_op, NULL, sizeof(*m));
	m->func = func;
	m->o = o;
	m->event_data = event_data;
	m->data = data;
	m->ea = ea;
	m->type = type;
	m->have_thread = FALSE;
	
	id = m->msg.seq;
	g_mutex_lock(ea->lock);
	ea->tasks = g_slist_prepend(ea->tasks, m);
	g_mutex_unlock(ea->lock);

	/* We use an idle function instead of our own message port only because the
	   gui message ports's notification buffer might overflow and deadlock us */
	if (type == MAIL_ASYNC_GUI) {
		if (ismain)
			g_idle_add(idle_async_event, m);
		else
			e_msgport_put(mail_gui_port, (EMsg *)m);
	} else
		e_thread_put(mail_thread_queued, (EMsg *)m);

	return id;
}

int mail_async_event_destroy(MailAsyncEvent *ea)
{
	int id;
	pthread_t thread = pthread_self();
	struct _proxy_msg *m;

	g_mutex_lock(ea->lock);
	while (ea->tasks) {
		m = ea->tasks->data;
		id = m->msg.seq;
		if (m->have_thread && pthread_equal(m->thread, thread)) {
			g_warning("Destroying async event from inside an event, returning EDEADLK");
			g_mutex_unlock(ea->lock);
			errno = EDEADLK;
			return -1;
		}
		g_mutex_unlock(ea->lock);
		mail_msg_wait(id);
		g_mutex_lock(ea->lock);
	}
	g_mutex_unlock(ea->lock);

	g_mutex_free(ea->lock);
	g_free(ea);

	return 0;
}

/* ********************************************************************** */

struct _call_msg {
	struct _mail_msg msg;
	mail_call_t type;
	MailMainFunc func;
	void *ret;
	va_list ap;
};

static void
do_call(struct _mail_msg *mm)
{
	struct _call_msg *m = (struct _call_msg *)mm;
	void *p1, *p2, *p3, *p4, *p5;
	int i1;
	va_list ap;

	G_VA_COPY(ap, m->ap);

	switch(m->type) {
	case MAIL_CALL_p_p:
		p1 = va_arg(ap, void *);
		m->ret = m->func(p1);
		break;
	case MAIL_CALL_p_pp:
		p1 = va_arg(ap, void *);
		p2 = va_arg(ap, void *);
		m->ret = m->func(p1, p2);
		break;
	case MAIL_CALL_p_ppp:
		p1 = va_arg(ap, void *);
		p2 = va_arg(ap, void *);
		p3 = va_arg(ap, void *);
		m->ret = m->func(p1, p2, p3);
		break;
	case MAIL_CALL_p_pppp:
		p1 = va_arg(ap, void *);
		p2 = va_arg(ap, void *);
		p3 = va_arg(ap, void *);
		p4 = va_arg(ap, void *);
		m->ret = m->func(p1, p2, p3, p4);
		break;
	case MAIL_CALL_p_ppppp:
		p1 = va_arg(ap, void *);
		p2 = va_arg(ap, void *);
		p3 = va_arg(ap, void *);
		p4 = va_arg(ap, void *);
		p5 = va_arg(ap, void *);
		m->ret = m->func(p1, p2, p3, p4, p5);
		break;
	case MAIL_CALL_p_ppippp:
		p1 = va_arg(ap, void *);
		p2 = va_arg(ap, void *);
		i1 = va_arg(ap, int);
		p3 = va_arg(ap, void *);
		p4 = va_arg(ap, void *);
		p5 = va_arg(ap, void *);
		m->ret = m->func(p1, p2, i1, p3, p4, p5);
		break;
	}
}

static struct _mail_msg_op mail_call_op = {
	NULL,
	do_call,
	NULL,
	NULL,
};

void *mail_call_main(mail_call_t type, MailMainFunc func, ...)
{
	struct _call_msg *m;
	void *ret;
	va_list ap;
	EMsgPort *reply = NULL;
	int ismain = pthread_equal(pthread_self(), mail_gui_thread);

	va_start(ap, func);

	if (!ismain)
		reply = e_msgport_new();

	m = mail_msg_new(&mail_call_op, reply, sizeof(*m));
	m->type = type;
	m->func = func;
	G_VA_COPY(m->ap, ap);

	if (!ismain) {
		e_msgport_put(mail_gui_port, (EMsg *)m);
		e_msgport_wait(reply);
		e_msgport_destroy(reply);
	} else {
		do_call(&m->msg);
	}

	va_end(ap);

	ret = m->ret;
	mail_msg_free(m);
	
	return ret;
}

/* ********************************************************************** */
/* locked via status_lock */
static int busy_state;

static void do_set_busy(struct _mail_msg *mm)
{
	set_stop(busy_state > 0);
}

static struct _mail_msg_op set_busy_op = {
	NULL,
	do_set_busy,
	NULL,
	NULL,
};

void mail_enable_stop(void)
{
	struct _mail_msg *m;

	MAIL_MT_LOCK(status_lock);
	busy_state++;
	if (busy_state == 1) {
		m = mail_msg_new(&set_busy_op, NULL, sizeof(*m));
		e_msgport_put(mail_gui_port, (EMsg *)m);
	}
	MAIL_MT_UNLOCK(status_lock);
}

void mail_disable_stop(void)
{
	struct _mail_msg *m;

	MAIL_MT_LOCK(status_lock);
	busy_state--;
	if (busy_state == 0) {
		m = mail_msg_new(&set_busy_op, NULL, sizeof(*m));
		e_msgport_put(mail_gui_port, (EMsg *)m);
	}
	MAIL_MT_UNLOCK(status_lock);
}

/* ******************************************************************************** */

struct _op_status_msg {
	struct _mail_msg msg;

	struct _CamelOperation *op;
	char *what;
	int pc;
	void *data;
};

static void do_op_status(struct _mail_msg *mm)
{
	EActivityHandler *activity_handler = mail_component_peek_activity_handler (mail_component_peek ());
	struct _op_status_msg *m = (struct _op_status_msg *)mm;
	struct _mail_msg *msg;
	struct _mail_msg_priv *data;
	char *out, *p, *o, c;
	int pc;
	
	g_assert (pthread_equal(mail_gui_thread, pthread_self ()));
	
	MAIL_MT_LOCK (mail_msg_lock);
	
	msg = g_hash_table_lookup (mail_msg_active_table, m->data);

	if (msg == NULL) {
		MAIL_MT_UNLOCK (mail_msg_lock);
		return;
	}
	
	data = msg->priv;
	
	out = alloca (strlen (m->what) * 2 + 1);
	o = out;
	p = m->what;
	while ((c = *p++)) {
		if (c == '%')
			*o++ = '%';
		*o++ = c;
	}
	*o = 0;
	
	pc = m->pc;
	
	if (data->activity_id == 0) {
		char *what;
		
		/* its being created/removed?  well leave it be */
		if (data->activity_state == 1 || data->activity_state == 3) {
			MAIL_MT_UNLOCK (mail_msg_lock);
			return;
		} else {
			data->activity_state = 1;
			
			if (progress_icon == NULL)
				progress_icon = e_icon_factory_get_icon ("stock_mail-unread", E_ICON_SIZE_MENU);
			
			MAIL_MT_UNLOCK (mail_msg_lock);
			if (msg->ops->describe_msg)
				what = msg->ops->describe_msg (msg, FALSE);
			/* uncommenting because message is not very useful for a user, see bug 271734*/
			else {
				what = g_strdup_printf("Working %p", msg);
			}
			

			data->activity_id = e_activity_handler_operation_started (activity_handler, "evolution-mail", progress_icon, what, TRUE);
			
			g_free (what);
			
			MAIL_MT_LOCK (mail_msg_lock);
			if (data->activity_state == 3) {
				MAIL_MT_UNLOCK (mail_msg_lock);
				if (msg->cancel)
					camel_operation_unref (msg->cancel);
				camel_exception_clear (&msg->ex);
				g_free (msg->priv);
				g_free (msg);
			} else {
				data->activity_state = 2;
				MAIL_MT_UNLOCK (mail_msg_lock);
			}
			return;
		}
	} else if (data->activity_id != 0) {
		MAIL_MT_UNLOCK (mail_msg_lock);
		e_activity_handler_operation_progressing (activity_handler, data->activity_id, out, (double)(pc/100.0));
	} else {
		MAIL_MT_UNLOCK (mail_msg_lock);
	}
}

static void
do_op_status_free (struct _mail_msg *mm)
{
	struct _op_status_msg *m = (struct _op_status_msg *)mm;

	g_free (m->what);
}

static struct _mail_msg_op op_status_op = {
	NULL,
	do_op_status,
	NULL,
	do_op_status_free,
};

static void
mail_operation_status (struct _CamelOperation *op, const char *what, int pc, void *data)
{
	struct _op_status_msg *m;
	
	d(printf("got operation statys: %s %d%%\n", what, pc));

	m = mail_msg_new(&op_status_op, NULL, sizeof(*m));
	m->op = op;
	m->what = g_strdup(what);
	switch (pc) {
	case CAMEL_OPERATION_START:
		pc = 0;
		break;
	case CAMEL_OPERATION_END:
		pc = 100;
		break;
	}
	m->pc = pc;
	m->data = data;
	e_msgport_put(mail_gui_port, (EMsg *)m);
}

/* ******************** */

static void
set_stop (int sensitive)
{
	static int last = FALSE;
	
	if (last == sensitive)
		return;
	
	/*bonobo_ui_component_set_prop (uic, "/commands/MailStop", "sensitive", sensitive ? "1" : "0", NULL);*/
	last = sensitive;
}