/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* elm-importer.c
 * 
 * Authors: 
 *    Iain Holmes  <iain@ximian.com>
 *
 * Copyright 2001 Ximian, Inc. (www.ximian.com)
 *
 * 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
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>

#include <glib.h>
#include <gnome.h>

#include <gconf/gconf.h>
#include <gconf/gconf-client.h>

#include <bonobo/bonobo-object.h>
#include <bonobo/bonobo-control.h>
#include <bonobo/bonobo-context.h>
#include <bonobo/bonobo-generic-factory.h>
#include <bonobo/bonobo-main.h>
#include <bonobo/bonobo-exception.h>
#include <bonobo/bonobo-moniker-util.h>

#include <bonobo-activation/bonobo-activation.h>

#include <importer/evolution-intelligent-importer.h>
#include <importer/evolution-importer-client.h>
#include <importer/GNOME_Evolution_Importer.h>

#include "mail/mail-importer.h"

#define ELM_INTELLIGENT_IMPORTER_IID "OAFIID:GNOME_Evolution_Mail_Elm_Intelligent_Importer_Factory:" BASE_VERSION
#define MBOX_IMPORTER_IID "OAFIID:GNOME_Evolution_Mail_Mbox_Importer:" BASE_VERSION
#define KEY "elm-mail-imported"

/*#define SUPER_IMPORTER_DEBUG*/
#ifdef SUPER_IMPORTER_DEBUG
#define d(x) x
#else
#define d(x)
#endif

typedef struct {
	EvolutionIntelligentImporter *ii;

	GList *dir_list;

	int progress_count;
	int more;
	EvolutionImporterResult result;

	GNOME_Evolution_Importer importer;
	EvolutionImporterListener *listener;
	
	GtkWidget *mail;
	gboolean do_mail;

	GtkWidget *dialog;
	GtkWidget *label;
	GtkWidget *progressbar;
} ElmImporter;

typedef struct {
	char *parent;
	char *foldername;
	char *path;
} ElmFolder;

static GHashTable *elm_prefs = NULL;

void mail_importer_module_init (void);

static void import_next (ElmImporter *importer);

static GtkWidget *
create_importer_gui (ElmImporter *importer)
{
	GtkWidget *dialog;

	dialog = gnome_message_box_new (_("Evolution is importing your old Elm mail"), GNOME_MESSAGE_BOX_INFO, NULL);
	gtk_window_set_title (GTK_WINDOW (dialog), _("Importing..."));

	importer->label = gtk_label_new (_("Please wait"));
	importer->progressbar = gtk_progress_bar_new ();
	gtk_progress_set_activity_mode (GTK_PROGRESS (importer->progressbar), TRUE);
	gtk_box_pack_start (GTK_BOX (GNOME_DIALOG (dialog)->vbox), importer->label, FALSE, FALSE, 0);
	gtk_box_pack_start (GTK_BOX (GNOME_DIALOG (dialog)->vbox), importer->progressbar, FALSE, FALSE, 0);

	return dialog;
}

static void
elm_store_settings (ElmImporter *importer)
{
	GConfClient *gconf;

	gconf = gconf_client_get_default ();
	gconf_client_set_bool (gconf, "/apps/evolution/importer/elm/mail", importer->do_mail, NULL);
}

static void
elm_restore_settings (ElmImporter *importer)
{
	GConfClient *gconf = gconf_client_get_default ();

	importer->do_mail = gconf_client_get_bool (gconf, "/apps/evolution/importer/elm/mail", NULL);
}

static void
importer_cb (EvolutionImporterListener *listener,
	     EvolutionImporterResult result,
	     gboolean more_items,
	     void *data)
{
	ElmImporter *importer = (ElmImporter *) data;

	importer->result = result;
	importer->more = more_items;
}

static gboolean
elm_import_file (ElmImporter *importer,
		 const char *path,
		 const char *folderpath)
{
	CORBA_boolean result;
	CORBA_Environment ev;
	CORBA_Object objref;
	char *str, *uri;
	struct stat st;

	str = g_strdup_printf (_("Importing %s as %s"), path, folderpath);
	gtk_label_set_text (GTK_LABEL (importer->label), str);
	g_free (str);
	while (g_main_context_iteration(NULL, FALSE))
		;

	uri = mail_importer_make_local_folder(folderpath);
	if (!uri)
		return FALSE;

	/* if its a dir, we just create it, but dont add anything */
	if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
		g_free(uri);
		/* this is ok, we return false to say we haven't launched an async task */
		return FALSE;
	}

	CORBA_exception_init(&ev);

	result = GNOME_Evolution_Importer_loadFile (importer->importer, path, uri, "", &ev);
	g_free(uri);
	if (ev._major != CORBA_NO_EXCEPTION || result == FALSE) {
		g_warning ("Exception here: %s", CORBA_exception_id (&ev));
		CORBA_exception_free (&ev);
		return FALSE;
	}

	/* process all items in a direct loop */
	importer->listener = evolution_importer_listener_new (importer_cb, importer);
	objref = bonobo_object_corba_objref (BONOBO_OBJECT (importer->listener));
	do {
		importer->progress_count++;
		if ((importer->progress_count & 0xf) == 0)
			gtk_progress_bar_pulse(GTK_PROGRESS_BAR(importer->progressbar));

		importer->result = -1;
		GNOME_Evolution_Importer_processItem (importer->importer, objref, &ev);
		if (ev._major != CORBA_NO_EXCEPTION) {
			g_warning ("Exception: %s", CORBA_exception_id (&ev));
			break;
		}

		while (importer->result == -1 || g_main_context_pending(NULL))
			g_main_context_iteration(NULL, TRUE);
	} while (importer->more);

	bonobo_object_unref((BonoboObject *)importer->listener);

	CORBA_exception_free (&ev);

	return FALSE;
}

static void
parse_elm_rc (const char *elmrc)
{
	static gboolean parsed = FALSE;
	char line[4096];
	FILE *handle;
	gboolean exists;

	if (parsed == TRUE)
		return;

	elm_prefs = g_hash_table_new (g_str_hash, g_str_equal);

	exists = g_file_exists (elmrc);
	if (exists == FALSE) {
		parsed = TRUE;
		return;
	}

	handle = fopen (elmrc, "r");
	if (handle == NULL) {
		parsed = TRUE;
		return;
	}

	while (fgets (line, 4096, handle) != NULL) {
		char *linestart, *end;
		char *key, *value;
		if (*line == '#' &&
		    (line[1] != '#' && line[2] != '#')) {
			continue;
		} else if (*line == '\n') {
			continue;
		} else if (*line == '#' && line[1] == '#' && line[2] == '#') {
			linestart = line + 4;
		} else {
			linestart = line;
		}

		end = strstr (linestart, " = ");
		if (end == NULL) {
			g_warning ("Broken line");
			continue;
		}

		*end = 0;
		key = g_strdup (linestart);

		linestart = end + 3;
		end = strchr (linestart, '\n');
		if (end == NULL) {
			g_warning ("Broken line");
			g_free (key);
			continue;
		}

		*end = 0;
		value = g_strdup (linestart);

		g_hash_table_insert (elm_prefs, key, value);
	}

	parsed = TRUE;
	fclose (handle);
}

static char *
elm_get_rc_value (const char *value)
{
	if (elm_prefs == NULL)
		return NULL;

	return g_hash_table_lookup (elm_prefs, value);
}

static gboolean
elm_can_import (EvolutionIntelligentImporter *ii,
		void *closure)
{
	ElmImporter *importer = closure;
	char *elmdir, *maildir, *aliasfile;
	char *elmrc;
	gboolean exists, mailexists, aliasexists;
	gboolean mail;
	struct stat st;
	GConfClient *gconf = gconf_client_get_default();

	mail = gconf_client_get_bool(gconf, "/apps/evolution/importer/elm/mail-imported", NULL);
	if (mail)
		return FALSE;
	
	importer->do_mail = !mail;
	gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (importer->mail),
				      importer->do_mail);
	
	elmdir = gnome_util_prepend_user_home (".elm");
	exists = lstat(elmdir, &st) == 0 && S_ISDIR(st.st_mode);
	
	g_free (elmdir);
	if (exists == FALSE)
		return FALSE;

	elmrc = gnome_util_prepend_user_home (".elm/elmrc");
	parse_elm_rc (elmrc);

	maildir = elm_get_rc_value ("maildir");
	if (maildir == NULL) {
		maildir = g_strdup ("Mail");
	} else {
		maildir = g_strdup (maildir);
	}

	if (!g_path_is_absolute (maildir)) {
		elmdir = gnome_util_prepend_user_home (maildir);
	} else {
		elmdir = g_strdup (maildir);
	}

	g_free (maildir);

	mailexists = lstat(elmdir, &st) == 0 && S_ISDIR(st.st_mode);
	g_free (elmdir);

	aliasfile = gnome_util_prepend_user_home (".elm/aliases");
	aliasexists = lstat(aliasfile, &st) == 0 && S_ISREG(st.st_mode);
	g_free (aliasfile);

	exists = (aliasexists || mailexists);

	return exists;
}

static void
import_next (ElmImporter *importer)
{
	ElmFolder *data;

trynext:
	if (importer->dir_list) {
		char *folder;
		GList *l;
		int ok;

		l = importer->dir_list;
		data = l->data;

		folder = g_concat_dir_and_file (data->parent, data->foldername);

		importer->dir_list = l->next;
		g_list_free_1(l);
		
		ok = elm_import_file (importer, data->path, folder);
		g_free (folder);
		g_free (data->parent);
		g_free (data->path);
		g_free (data->foldername);
		g_free (data);
		/* its ugly, but so is everything else in this file */
		if (!ok)
			goto trynext;
	} else {
		bonobo_object_unref((BonoboObject *)importer->ii);
	}
}

static void
scan_dir (ElmImporter *importer,
	  const char *orig_parent,
	  const char *dirname)
{
	DIR *maildir;
	struct stat buf;
	struct dirent *current;
	char *str;

	maildir = opendir (dirname);
	if (maildir == NULL) {
		g_warning ("Could not open %s\nopendir returned: %s",
			   dirname, g_strerror (errno));
		return;
	}
	
	str = g_strdup_printf (_("Scanning %s"), dirname);
	gtk_label_set_text (GTK_LABEL (importer->label), str);
	g_free (str);

	while (gtk_events_pending ()) {
		gtk_main_iteration ();
	}

	current = readdir (maildir);
	while (current) {
		ElmFolder *pf;
		char *fullname;
		
		/* Ignore . and .. */
		if (current->d_name[0] == '.') {
			if (current->d_name[1] == '\0' ||
			    (current->d_name[1] == '.' && current->d_name[2] == '\0')) {
				current = readdir (maildir);
				continue;
			}
		}
		
		fullname = g_concat_dir_and_file (dirname, current->d_name);
		if (stat (fullname, &buf) == -1) {
			g_warning ("Could not stat %s\nstat returned: %s",
				   fullname, g_strerror (errno));
			current = readdir (maildir);
			g_free (fullname);
			continue;
		}
		
		if (S_ISREG (buf.st_mode)) {
			pf = g_new (ElmFolder, 1);
			pf->path = g_strdup (fullname);
			pf->parent = g_strdup (orig_parent);
			pf->foldername = g_strdup (current->d_name);
			importer->dir_list = g_list_append (importer->dir_list, pf);
		} else if (S_ISDIR (buf.st_mode)) {
			char *subdir;

			pf = g_new (ElmFolder, 1);
			pf->path = NULL;
			pf->parent = g_strdup (orig_parent);
			pf->foldername = g_strdup (current->d_name);
			importer->dir_list = g_list_append (importer->dir_list, pf);

			subdir = g_concat_dir_and_file (orig_parent, current->d_name);
			scan_dir (importer, subdir, fullname);
			g_free (subdir);
		}
		
		g_free (fullname);
		current = readdir (maildir);
	}
}

static void
elm_create_structure (EvolutionIntelligentImporter *ii,
		      void *closure)
{
	ElmImporter *importer = closure;
	char *maildir;

	/* Reference our object so when the shell release_unrefs us
	   we will still exist and not go byebye */
	bonobo_object_ref (BONOBO_OBJECT (ii));

	elm_store_settings (importer);

	if (importer->do_mail == TRUE) {
		char *elmdir;
		GConfClient *gconf = gconf_client_get_default();

		importer->dialog = create_importer_gui (importer);
		gtk_widget_show_all (importer->dialog);
		while (gtk_events_pending ()) {
			gtk_main_iteration ();
		}

		gconf_client_set_bool(gconf, "/apps/evolution/importer/elm/mail-imported", TRUE, NULL);
		
		maildir = elm_get_rc_value ("maildir");
		if (maildir == NULL) {
			maildir = g_strdup ("Mail");
		} else {
			maildir = g_strdup (maildir);
		}
		
		if (!g_path_is_absolute (maildir)) {
			elmdir = gnome_util_prepend_user_home (maildir);
		} else {
			elmdir = g_strdup (maildir);
		}
		
		g_free (maildir);
		
		scan_dir (importer, "/", elmdir);
		g_free (elmdir);
		
		/* Import them */
		import_next (importer);
	}

	bonobo_object_unref (BONOBO_OBJECT (ii));
}

static void
elm_destroy_cb (ElmImporter *importer, GtkObject *object)
{
	elm_store_settings (importer);

	if (importer->dialog)
		gtk_widget_destroy(importer->dialog);

	bonobo_object_release_unref (importer->importer, NULL);
}

/* Fun initialisation stuff */
/* Fun control stuff */
static void
checkbox_toggle_cb (GtkToggleButton *tb,
		    gboolean *do_item)
{
	*do_item = gtk_toggle_button_get_active (tb);
}

static BonoboControl *
create_checkboxes_control (ElmImporter *importer)
{
	GtkWidget *hbox;
	BonoboControl *control;

	hbox = gtk_vbox_new (FALSE, 2);

	importer->mail = gtk_check_button_new_with_label (_("Mail"));
	gtk_signal_connect (GTK_OBJECT (importer->mail), "toggled",
			    GTK_SIGNAL_FUNC (checkbox_toggle_cb),
			    &importer->do_mail);

	gtk_box_pack_start (GTK_BOX (hbox), importer->mail, FALSE, FALSE, 0);

	gtk_widget_show_all (hbox);
	control = bonobo_control_new (hbox);
	return control;
}

static BonoboObject *
elm_factory_fn (BonoboGenericFactory *_factory,
		const char *id,
		void *closure)
{
	EvolutionIntelligentImporter *importer;
	BonoboControl *control;
	ElmImporter *elm;
	CORBA_Environment ev;
	char *message = N_("Evolution has found Elm mail files\n"
			   "Would you like to import them into Evolution?");

	elm = g_new0 (ElmImporter, 1);

	CORBA_exception_init (&ev);

	elm_restore_settings (elm);

	elm->importer = bonobo_activation_activate_from_id (MBOX_IMPORTER_IID, 0, NULL, &ev);
	if (ev._major != CORBA_NO_EXCEPTION) {
		g_free (elm);
		g_warning ("Could not start MBox importer\n%s", 
			   CORBA_exception_id (&ev));
		CORBA_exception_free (&ev);
		return NULL;
	}
	CORBA_exception_free (&ev);

	importer = evolution_intelligent_importer_new (elm_can_import,
						       elm_create_structure,
						       _("Elm"),
						       _(message), elm);
	g_object_weak_ref(G_OBJECT (importer), (GWeakNotify)elm_destroy_cb, elm);
	elm->ii = importer;

	control = create_checkboxes_control (elm);
	bonobo_object_add_interface (BONOBO_OBJECT (importer),
				     BONOBO_OBJECT (control));
	return BONOBO_OBJECT (importer);
}

void
mail_importer_module_init (void)
{
	static gboolean initialised = FALSE;
	BonoboGenericFactory *factory;

	if (initialised == TRUE)
		return;

	factory = bonobo_generic_factory_new (ELM_INTELLIGENT_IMPORTER_IID,
					      elm_factory_fn, NULL);
	if (factory == NULL)
		g_warning ("Could not initialise Elm Intelligent Mail Importer.");
	initialised = TRUE;
}