/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *		Michael Zucchi <notzed@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_IMPORT_H
#include <import.h>
#endif

#include <string.h>
#include <stdlib.h>

#include <gtk/gtk.h>

#include "e-import.h"

#include <glib/gi18n.h>

#define d(x)

#define _PRIVATE(o) (g_type_instance_get_private ((GTypeInstance *)o, e_import_get_type()))

struct _EImportImporters {
	struct _EImportImporters *next, *prev;

	EImportImporter *importer;
	EImportImporterFunc free;
	gpointer data;
};

struct _EImportPrivate {
	gint dummy;
};

static GObjectClass *ep_parent;

static void
ep_init(GObject *o)
{
	/*EImport *emp = (EImport *)o;*/
}

static void
ep_finalise(GObject *o)
{
	EImport *emp = (EImport *)o;

	d(printf("finalising EImport %p\n", o));

	g_free(emp->id);

	((GObjectClass *)ep_parent)->finalize(o);
}

static void
ec_target_free(EImport *ep, EImportTarget *t)
{
	switch (t->type) {
	case E_IMPORT_TARGET_URI: {
		EImportTargetURI *s = (EImportTargetURI *)t;

		g_free(s->uri_src);
		g_free(s->uri_dest);
		break; }
	case E_IMPORT_TARGET_HOME: {
		EImportTargetHome *s = (EImportTargetHome *)t;

		g_free(s->homedir);
		break; }
	}

	g_datalist_clear(&t->data);
	g_free(t);
	g_object_unref(ep);
}

static void
ep_class_init(GObjectClass *klass)
{
	d(printf("EImport class init %p '%s'\n", klass, g_type_name(((GObjectClass *)klass)->g_type_class.g_type)));

	g_type_class_add_private(klass, sizeof(struct _EImportPrivate));

	klass->finalize = ep_finalise;
	((EImportClass *)klass)->target_free = ec_target_free;
}

static void
ep_base_init(GObjectClass *klass)
{
	e_dlist_init(&((EImportClass *)klass)->importers);
}

/**
 * e_import_get_type:
 *
 * Standard GObject method.  Used to subclass for the concrete
 * implementations.
 *
 * Return value: EImport type.
 **/
GType
e_import_get_type(void)
{
	static GType type = 0;

	if (type == 0) {
		static const GTypeInfo info = {
			sizeof(EImportClass),
			(GBaseInitFunc)ep_base_init, NULL,
			(GClassInitFunc)ep_class_init, NULL, NULL,
			sizeof(EImport), 0,
			(GInstanceInitFunc)ep_init
		};
		ep_parent = g_type_class_ref(G_TYPE_OBJECT);
		type = g_type_register_static(G_TYPE_OBJECT, "EImport", &info, 0);
	}

	return type;
}

/**
 * e_import_construct:
 * @ep: The instance to initialise.
 * @id: The name of the instance.
 *
 * Used by implementing classes to initialise base parameters.
 *
 * Return value: @ep is returned.
 **/
EImport *e_import_construct(EImport *ep, const gchar *id)
{
	ep->id = g_strdup(id);

	return ep;
}

EImport *e_import_new(const gchar *id)
{
	EImport *ei = g_object_new(e_import_get_type(), NULL);

	return e_import_construct(ei, id);
}

/**
 * e_import_import:
 * @ei:
 * @t: Target to import.
 * @im: Importer to use.
 * @status: Status callback, called with progress information.
 * @done: Complete callback, will always be called once complete.
 * @data:
 *
 * Run the import function of the selected importer.  Once the
 * importer has finished, it MUST call the e_import_complete()
 * function.  This allows importers to run in synchronous or
 * asynchronous mode.
 *
 * When complete, the @done callback will be called.
 **/
void
e_import_import(EImport *ei, EImportTarget *t, EImportImporter *im, EImportStatusFunc status, EImportCompleteFunc done, gpointer data)
{
	g_return_if_fail(im != NULL);
	g_return_if_fail(im != NULL);

	ei->status = status;
	ei->done = done;
	ei->done_data = data;

	im->import(ei, t, im);
}

void e_import_cancel(EImport *ei, EImportTarget *t, EImportImporter *im)
{
	if (im->cancel)
		im->cancel(ei, t, im);
}

/**
 * e_import_get_widget:
 * @ei:
 * @target: Target of interest
 * @im: Importer to get widget of
 *
 * Gets a widget that the importer uses to configure its
 * destination.  This widget should be packed into a container
 * widget.  It should not be shown_all.
 *
 * Return value: NULL if the importer doesn't support/require
 * a destination.
 **/
GtkWidget *
e_import_get_widget(EImport *ei, EImportTarget *target, EImportImporter *im)
{
	g_return_val_if_fail(im != NULL, NULL);
	g_return_val_if_fail(target != NULL, NULL);

	return im->get_widget(ei, target, im);
}

/**
 * e_import_complete:
 * @ei:
 * @target: Target just completed (unused currently)
 *
 * Signify that an import is complete.  This must be called by
 * importer implementations when they are done.
 **/
void e_import_complete(EImport *ei, EImportTarget *target)
{
	if (ei->done)
		ei->done(ei, ei->done_data);
}

void e_import_status(EImport *ei, EImportTarget *target, const gchar *what, gint pc)
{
	if (ei->status)
		ei->status(ei, what, pc, ei->done_data);
}

/**
 * e_import_get_importers:
 * @emp:
 * @target:
 *
 * Get a list of importers.  If @target is supplied, then only
 * importers which support the type and location specified by the
 * target are listed.  If @target is NULL, then all importers are
 * listed.
 *
 * Return value: A list of importers.  The list should be freed when
 * no longer needed.
 **/
GSList *
e_import_get_importers(EImport *emp, EImportTarget *target)
{
	EImportClass *k = (EImportClass *)G_OBJECT_GET_CLASS(emp);
	struct _EImportImporters *ei;
	GSList *importers = NULL;

	for (ei = (struct _EImportImporters *)k->importers.head;
	     ei->next;
	     ei = ei->next) {
		if (target == NULL
		    || (ei->importer->type == target->type
			&& ei->importer->supported(emp, target, ei->importer))) {
			importers = g_slist_append(importers, ei->importer);
		}
	}

	return importers;
}

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

/**
 * e_import_class_add_importer:
 * @ec: An initialised implementing instance of EImport.
 * @importer: Importer to add.
 * @freefunc: If supplied, called to free the importer node
 * when it is no longer needed.
 * @data: Data for the callback.
 *
 **/
void
e_import_class_add_importer(EImportClass *klass, EImportImporter *importer, EImportImporterFunc freefunc, gpointer data)
{
	struct _EImportImporters *node, *ei, *en;

	node = g_malloc(sizeof(*node));
	node->importer = importer;
	node->free = freefunc;
	node->data = data;
	ei = (struct _EImportImporters *)klass->importers.head;
	en = ei->next;
	while (en && ei->importer->pri < importer->pri) {
		ei = en;
		en = en->next;
	}

	if (en == NULL)
		e_dlist_addtail(&klass->importers, (EDListNode *)node);
	else {
		node->next = ei->next;
		node->next->prev = node;
		node->prev = ei;
		ei->next = node;
	}
}

void e_import_class_remove_importer(EImportClass *klass, EImportImporter *f)
{
	struct _EImportImporters *ei, *en;

	ei = (struct _EImportImporters *)klass->importers.head;
	en = ei->next;
	while (en) {
		if (ei->importer == f) {
			e_dlist_remove((EDListNode *)ei);
			if (ei->free)
				ei->free(f, ei->data);
			g_free(ei);
		}
		ei = en;
		en = en->next;
	}
}

/**
 * e_import_target_new:
 * @ep: Parent EImport object.
 * @type: type, up to implementor
 * @size: Size of object to allocate.
 *
 * Allocate a new import target suitable for this class.  Implementing
 * classes will define the actual content of the target.
 **/
gpointer e_import_target_new(EImport *ep, gint type, gsize size)
{
	EImportTarget *t;

	if (size < sizeof(EImportTarget)) {
		g_warning ("Size less than size of EImportTarget\n");
		size = sizeof (EImportTarget);
	}

	t = g_malloc0(size);
	t->import = ep;
	g_object_ref(ep);
	t->type = type;
	g_datalist_init(&t->data);

	return t;
}

/**
 * e_import_target_free:
 * @ep: Parent EImport object.
 * @o: The target to fre.
 *
 * Free a target.  The implementing class can override this method to
 * free custom targets.
 **/
void
e_import_target_free(EImport *ep, gpointer o)
{
	EImportTarget *t = o;

	((EImportClass *)G_OBJECT_GET_CLASS(ep))->target_free(ep, t);
}

EImportTargetURI *e_import_target_new_uri(EImport *ei, const gchar *suri, const gchar *duri)
{
	EImportTargetURI *t = e_import_target_new(ei, E_IMPORT_TARGET_URI, sizeof(*t));

	t->uri_src = g_strdup(suri);
	t->uri_dest = g_strdup(duri);

	return t;
}

EImportTargetHome *e_import_target_new_home(EImport *ei, const gchar *home)
{
	EImportTargetHome *t = e_import_target_new(ei, E_IMPORT_TARGET_HOME, sizeof(*t));

	t->homedir = g_strdup(home);

	return t;
}

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

/* Import menu plugin handler */

/*
<e-plugin
  class="org.gnome.mail.plugin.import:1.0"
  id="org.gnome.mail.plugin.import.item:1.0"
  type="shlib"
  location="/opt/gnome2/lib/camel/1.0/libcamelimap.so"
  name="imap"
  description="IMAP4 and IMAP4v1 mail store">
  <hook class="org.gnome.mail.importMenu:1.0"
        handler="HandleImport">
  <menu id="any" target="select">
   <item
    type="item|toggle|radio|image|submenu|bar"
    active
    path="foo/bar"
    label="label"
    icon="foo"
    activate="ep_view_emacs"/>
  </menu>
  </extension>

*/

static gpointer emph_parent_class;
#define emph ((EImportHook *)eph)

static const EImportHookTargetMask eih_no_masks[] = {
	{ NULL }
};

static const EImportHookTargetMap eih_targets[] = {
	{ "uri", E_IMPORT_TARGET_URI, eih_no_masks },
	{ "home", E_IMPORT_TARGET_HOME, eih_no_masks },
	{ NULL }
};

static gboolean eih_supported(EImport *ei, EImportTarget *target, EImportImporter *im)
{
	struct _EImportHookImporter *ihook = (EImportHookImporter *)im;
	EImportHook *hook = im->user_data;

	return e_plugin_invoke(hook->hook.plugin, ihook->supported, target) != NULL;
}

static GtkWidget *eih_get_widget(EImport *ei, EImportTarget *target, EImportImporter *im)
{
	struct _EImportHookImporter *ihook = (EImportHookImporter *)im;
	EImportHook *hook = im->user_data;

	return e_plugin_invoke(hook->hook.plugin, ihook->get_widget, target);
}

static void eih_import(EImport *ei, EImportTarget *target, EImportImporter *im)
{
	struct _EImportHookImporter *ihook = (EImportHookImporter *)im;
	EImportHook *hook = im->user_data;

	e_plugin_invoke(hook->hook.plugin, ihook->import, target);
}

static void eih_cancel(EImport *ei, EImportTarget *target, EImportImporter *im)
{
	struct _EImportHookImporter *ihook = (EImportHookImporter *)im;
	EImportHook *hook = im->user_data;

	e_plugin_invoke(hook->hook.plugin, ihook->cancel, target);
}

static void
eih_free_importer(EImportImporter *im, gpointer data)
{
	EImportHookImporter *ihook = (EImportHookImporter *)im;

	g_free(ihook->supported);
	g_free(ihook->get_widget);
	g_free(ihook->import);
	g_free(ihook);
}

static struct _EImportHookImporter *
emph_construct_importer(EPluginHook *eph, xmlNodePtr root)
{
	struct _EImportHookImporter *item;
	EImportHookTargetMap *map;
	EImportHookClass *klass = (EImportHookClass *)G_OBJECT_GET_CLASS(eph);
	gchar *tmp;

	d(printf("  loading import item\n"));
	item = g_malloc0(sizeof(*item));

	tmp = (gchar *)xmlGetProp(root, (const guchar *)"target");
	if (tmp == NULL)
		goto error;
	map = g_hash_table_lookup(klass->target_map, tmp);
	xmlFree(tmp);
	if (map == NULL)
		goto error;

	item->importer.type = map->id;
	item->supported = e_plugin_xml_prop(root, "supported");
	item->get_widget = e_plugin_xml_prop(root, "get-widget");
	item->import = e_plugin_xml_prop(root, "import");
	item->cancel = e_plugin_xml_prop(root, "cancel");

	item->importer.name = e_plugin_xml_prop(root, "name");
	item->importer.description = e_plugin_xml_prop(root, "description");

	item->importer.user_data = eph;

	if (item->import == NULL || item->supported == NULL)
		goto error;

	item->importer.supported = eih_supported;
	item->importer.import = eih_import;
	if (item->get_widget)
		item->importer.get_widget = eih_get_widget;
	if (item->cancel)
		item->importer.cancel = eih_cancel;

	return item;
error:
	d(printf("error!\n"));
	eih_free_importer((EImportImporter *)item, NULL);
	return NULL;
}

static gint
emph_construct(EPluginHook *eph, EPlugin *ep, xmlNodePtr root)
{
	xmlNodePtr node;
	EImportClass *klass;

	d(printf("loading import hook\n"));

	if (((EPluginHookClass *)emph_parent_class)->construct(eph, ep, root) == -1)
		return -1;

	klass = ((EImportHookClass *)G_OBJECT_GET_CLASS(eph))->import_class;

	node = root->children;
	while (node) {
		if (strcmp((gchar *)node->name, "importer") == 0) {
			struct _EImportHookImporter *ihook;

			ihook = emph_construct_importer(eph, node);
			if (ihook) {
				e_import_class_add_importer(klass, &ihook->importer, eih_free_importer, eph);
				emph->importers = g_slist_append(emph->importers, ihook);
			}
		}
		node = node->next;
	}

	eph->plugin = ep;

	return 0;
}

static void
emph_finalise(GObject *o)
{
	/*EPluginHook *eph = (EPluginHook *)o;*/

	/* free importers? */

	((GObjectClass *)emph_parent_class)->finalize(o);
}

static void
emph_class_init(EPluginHookClass *klass)
{
	gint i;

	((GObjectClass *)klass)->finalize = emph_finalise;
	klass->construct = emph_construct;

	/** @HookClass: Evolution Importers
	 * @Id: org.gnome.evolution.import:1.0
	 * @Target: EImportTarget
	 *
	 * A hook for data importers.
	 **/

	klass->id = "org.gnome.evolution.import:1.0";

	d(printf("EImportHook: init class %p '%s'\n", klass, g_type_name(((GObjectClass *)klass)->g_type_class.g_type)));

	((EImportHookClass *)klass)->target_map = g_hash_table_new(g_str_hash, g_str_equal);
	((EImportHookClass *)klass)->import_class = g_type_class_ref(e_import_get_type());

	for (i=0;eih_targets[i].type;i++)
		e_import_hook_class_add_target_map((EImportHookClass *)klass, &eih_targets[i]);
}

/**
 * e_import_hook_get_type:
 *
 * Standard GObject function to get the object type.
 *
 * Return value: The EImportHook class type.
 **/
GType
e_import_hook_get_type(void)
{
	static GType type = 0;

	if (!type) {
		static const GTypeInfo info = {
			sizeof(EImportHookClass), NULL, NULL, (GClassInitFunc) emph_class_init, NULL, NULL,
			sizeof(EImportHook), 0, (GInstanceInitFunc) NULL,
		};

		emph_parent_class = g_type_class_ref(e_plugin_hook_get_type());
		type = g_type_register_static(e_plugin_hook_get_type(), "EImportHook", &info, 0);
	}

	return type;
}

/**
 * e_import_hook_class_add_target_map:
 *
 * @klass: The dervied EimportHook class.
 * @map: A map used to describe a single EImportTarget type for this
 * class.
 *
 * Add a targe tmap to a concrete derived class of EImport.  The
 * target map enumates the target types available for the implenting
 * class.
 **/
void e_import_hook_class_add_target_map(EImportHookClass *klass, const EImportHookTargetMap *map)
{
	g_hash_table_insert(klass->target_map, (gpointer)map->type, (gpointer)map);
}