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/* -*- 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. (http://www.ximian.com)
 *
 * 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 of the
 * License, 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, 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 <bonobo/bonobo-object.h>
#include <bonobo/bonobo-generic-factory.h>
#include <camel/camel-mime-message.h>
#include <camel/camel-mime-part.h>
#include <camel/camel-exception.h>

#include <importer/evolution-intelligent-importer.h>
#include <importer/GNOME_Evolution_Importer.h>
#include "mail-importer.h"
#include "mail-tools.h"

extern char *evolution_dir;

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

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

typedef struct {
    MailImporter importer;
    GList *dir_list;

    int num;
    CamelMimeParser *mp;
    BonoboListener *listener;
} ElmImporter;

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

static gboolean
elm_is_mbox (const char *filename)
{
    char sig[5];
    int fd;
    
    fd = open (filename, O_RDONLY);
    if (read (fd, sig, 5) != 5) {
        close (fd);
        return FALSE;
    }

    close (fd);
    if (strncmp (sig, "From ", 5) != 0) {
        return FALSE;
    }

    return TRUE;
}

static gboolean
elm_import_mbox (CamelFolder *folder,
         const char *filename)
{
    gboolean done = FALSE;
    CamelException *ex;
    CamelMimeParser *mp;
    int fd, n = 0;

    fd = open (filename, O_RDONLY);
    if (fd == -1) {
        g_warning ("Cannot open %s", filename);
        return FALSE;
    }
    
    camel_object_ref (CAMEL_OBJECT (folder));
    camel_folder_freeze (folder);

    ex = camel_exception_new ();
    mp = camel_mime_parser_new ();
    camel_mime_parser_scan_from (mp, TRUE);
    if (camel_mime_parser_init_with_fd (mp, fd) == -1) {
        g_warning ("Unable to process file %s", filename);
        camel_object_unref (CAMEL_OBJECT (mp));
        camel_folder_thaw (folder);
        camel_object_unref (CAMEL_OBJECT (folder));
        return FALSE;
    }

    while (camel_mime_parser_step (mp, 0, 0) == HSCAN_FROM) {
        /* Import the next message */
        CamelMimeMessage *msg;
        CamelMessageInfo *info;

        msg = camel_mime_message_new ();
        if (camel_mime_part_construct_from_parser (CAMEL_MIME_PART (msg),
                               mp) == -1) {
            g_warning ("Failed message %d", n);
            camel_object_unref (CAMEL_OBJECT (msg));
            done = TRUE;
        }

        info = g_new0 (CamelMessageInfo, 1);
        camel_folder_append_message (folder, msg, info, ex);
        g_free (info);
        camel_object_unref (CAMEL_OBJECT (msg));
        if (camel_exception_is_set (ex)) {
            g_warning ("Failed message %d", n);
            done = TRUE;
        }

        if (!done) {
            n++;
            camel_mime_parser_step (mp, 0, 0);
        }
    }

    camel_folder_sync (folder, FALSE, ex);
    camel_folder_thaw (folder);
    camel_object_unref (CAMEL_OBJECT (folder));
    done = TRUE;

    camel_exception_free (ex);
    return done;
}

static void
elm_import_file (ElmImporter *importer,
         const char *path,
         const char *fullpath)
{
    char *protocol;
    CamelException *ex;
    CamelFolder *folder;

    g_warning ("Importing %s into %s", path, fullpath);
    protocol = g_strconcat ("file://", fullpath, NULL);
    ex = camel_exception_new ();
    folder = mail_tool_uri_to_folder (protocol, ex);
    g_free (protocol);

    if (camel_exception_is_set (ex)) {
        camel_exception_free (ex);
        return;
    }
    camel_exception_free (ex);

    if (folder == NULL) {
        return;
    }

    elm_import_mbox (folder, path);
}

static gboolean
elm_can_import (EvolutionIntelligentImporter *ii,
        void *closure)
{
    ElmImporter *importer = closure;
    FILE *prefs_handle;
    char *key, *maildir;
    gboolean exists;

    /* Already imported */
    key = g_strdup_printf ("=%s/config/Mail=/importers/", evolution_dir);
    gnome_config_push_prefix (key);
    g_free (key);

    if (gnome_config_get_bool (KEY) == TRUE) {
        gnome_config_pop_prefix ();
        return FALSE;
    }
    gnome_config_pop_prefix ();

    maildir = gnome_util_prepend_user_home ("Mail");
    exists = g_file_exists (maildir);
    g_free (maildir);

    return exists;
}

static void
scan_dir (ElmImporter *importer,
      const char *dirname,
      const char *orig_parent)
{
    DIR *maildir;
    struct stat buf;
    struct dirent *current;
    
    maildir = opendir (dirname);
    if (maildir == NULL) {
        g_warning ("Could not open %s\nopendir returned: %s",
               dirname, g_strerror (errno));
        return;
    }
    
    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, fullname, subdir);
            g_free (subdir);
        }
        
        g_free (fullname);
        current = readdir (maildir);
    }
}

static void
folder_created_cb (BonoboListener *listener,
           const char *event_name,
           const BonoboArg *event_data,
           CORBA_Environment *ev,
           ElmImporter *importer)
{
    ElmFolder *folder;
    GList *l;
    GNOME_Evolution_Storage_FolderResult *result;
    char *fullpath;

    if (strcmp (event_name, "evolution-shell:folder_created") != 0) {
        return; /* Unknown event notification */
    }

    result = event_data->_value;
    fullpath = result->path;

    l = importer->dir_list;
    importer->dir_list = g_list_remove_link (importer->dir_list, l);
    folder = l->data;
    g_list_free_1 (l);

    /* We got the folder, so try to import the file into it. */
    if (folder->path != NULL && elm_is_mbox (folder->path)) {
        elm_import_file (importer, folder->path, fullpath);
    }

    g_free (folder->path);
    g_free (folder->parent);
    g_free (folder->foldername);
    g_free (folder);

    if (importer->dir_list) {
        /* Do the next in the list */
        folder = importer->dir_list->data;
        mail_importer_create_folder (folder->parent, folder->foldername,
                         NULL, importer->listener);
    }
}

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

    maildir = gnome_util_prepend_user_home ("Mail");
    scan_dir (importer, maildir, "/");
    g_free (maildir);

    if (importer->dir_list == NULL)
        return;

    folder = importer->dir_list->data;
    mail_importer_create_folder (folder->parent, folder->foldername, NULL,
                     importer->listener);

    key = g_strdup_printf ("=%s/config/Mail=/importers/", evolution_dir);
    gnome_config_push_prefix (key);
    g_free (key);
    
    gnome_config_set_bool (KEY, TRUE);
    gnome_config_pop_prefix ();
    
    gnome_config_sync ();
    gnome_config_drop_all ();
}

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

    elm = g_new0 (ElmImporter, 1);
    elm->listener = bonobo_listener_new (NULL, NULL);
    gtk_signal_connect (GTK_OBJECT (elm->listener), "event_notify",
                GTK_SIGNAL_FUNC (folder_created_cb), elm);

    importer = evolution_intelligent_importer_new (elm_can_import,
                               elm_create_structure,
                               _("Elm mail"),
                               _(message), elm);

    return BONOBO_OBJECT (importer);
}

/* Entry point */
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;
}