/*
 * e-mail-formatter-attachment.c
 *
 * 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.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

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

#include <glib/gi18n-lib.h>

#include <shell/e-shell.h>
#include <shell/e-shell-window.h>

#include "e-mail-formatter-extension.h"
#include "e-mail-inline-filter.h"
#include "e-mail-part-attachment-bar.h"
#include "e-mail-part-attachment.h"
#include "e-mail-part-utils.h"

#define d(x)

typedef EMailFormatterExtension EMailFormatterAttachment;
typedef EMailFormatterExtensionClass EMailFormatterAttachmentClass;

GType e_mail_formatter_attachment_get_type (void);

G_DEFINE_TYPE (
	EMailFormatterAttachment,
	e_mail_formatter_attachment,
	E_TYPE_MAIL_FORMATTER_EXTENSION)

static const gchar *formatter_mime_types[] = {
	E_MAIL_PART_ATTACHMENT_MIME_TYPE,
	"application/vnd.evolution.widget.attachment-button",
	NULL
};

static EAttachmentStore *
find_attachment_store (EMailPartList *part_list,
                       EMailPart *start)
{
	EAttachmentStore *store = NULL;
	GQueue queue = G_QUEUE_INIT;
	GList *head, *link;
	const gchar *start_id;
	gchar *tmp, *pos;
	EMailPart *part;
	gchar *id;

	start_id = e_mail_part_get_id (start);

	e_mail_part_list_queue_parts (part_list, NULL, &queue);

	head = g_queue_peek_head_link (&queue);

	id = g_strconcat (start_id, ".attachment-bar", NULL);
	tmp = g_strdup (id);
	part = NULL;
	do {
		d (printf ("Looking up attachment bar as %s\n", id));

		for (link = head; link != NULL; link = g_list_next (link)) {
			EMailPart *p = link->data;
			const gchar *p_id;

			p_id = e_mail_part_get_id (p);

			if (g_strcmp0 (p_id, id) == 0) {
				part = p;
				break;
			}
		}

		pos = g_strrstr (tmp, ".");
		if (!pos)
			break;

		g_free (id);
		g_free (tmp);
		tmp = g_strndup (start_id, pos - tmp);
		id = g_strdup_printf ("%s.attachment-bar", tmp);

	} while (pos && !part);

	g_free (id);
	g_free (tmp);

	if (part != NULL)
		store = e_mail_part_attachment_bar_get_store (
			E_MAIL_PART_ATTACHMENT_BAR (part));

	while (!g_queue_is_empty (&queue))
		g_object_unref (g_queue_pop_head (&queue));

	return store;
}

static gboolean
emfe_attachment_format (EMailFormatterExtension *extension,
                        EMailFormatter *formatter,
                        EMailFormatterContext *context,
                        EMailPart *part,
                        GOutputStream *stream,
                        GCancellable *cancellable)
{
	gchar *text, *html;
	gchar *button_id;
	EAttachmentStore *store;
	EMailExtensionRegistry *registry;
	GQueue *extensions;
	EMailPartAttachment *empa;
	CamelMimePart *mime_part;
	CamelMimeFilterToHTMLFlags flags;
	GString *buffer;
	const gchar *attachment_part_id;
	const gchar *part_id;

	g_return_val_if_fail (E_IS_MAIL_PART_ATTACHMENT (part), FALSE);

	empa = (EMailPartAttachment *) part;
	part_id = e_mail_part_get_id (part);

	if ((context->mode == E_MAIL_FORMATTER_MODE_NORMAL) ||
	    (context->mode == E_MAIL_FORMATTER_MODE_PRINTING) ||
	    (context->mode == E_MAIL_FORMATTER_MODE_ALL_HEADERS)) {
		EAttachment *attachment;
		GList *head, *link;

		attachment = e_mail_part_attachment_ref_attachment (
			E_MAIL_PART_ATTACHMENT (part));

		head = g_queue_peek_head_link (&part->validities);

		for (link = head; link != NULL; link = g_list_next (link)) {
			EMailPartValidityPair *pair = link->data;

			if (pair == NULL)
				continue;

			if ((pair->validity_type & E_MAIL_PART_VALIDITY_SIGNED) != 0)
				e_attachment_set_signed (
					attachment,
					pair->validity->sign.status);

			if ((pair->validity_type & E_MAIL_PART_VALIDITY_ENCRYPTED) != 0)
				e_attachment_set_encrypted (
					attachment,
					pair->validity->encrypt.status);
		}

		store = find_attachment_store (context->part_list, part);
		if (store) {
			GList *attachments = e_attachment_store_get_attachments (store);
			if (!g_list_find (attachments, attachment)) {
				e_attachment_store_add_attachment (
					store, attachment);
			}
			g_list_free (attachments);
		} else {
			g_warning ("Failed to locate attachment-bar for %s", part_id);
		}

		g_object_unref (attachment);
	}

	registry = e_mail_formatter_get_extension_registry (formatter);

	extensions = e_mail_extension_registry_get_for_mime_type (
		registry, empa->snoop_mime_type);
	if (extensions == NULL)
		extensions = e_mail_extension_registry_get_fallback (
			registry, empa->snoop_mime_type);

	/* If the attachment is requested as RAW, then call the
	 * handler directly and do not append any other code. */
	if ((context->mode == E_MAIL_FORMATTER_MODE_RAW) ||
	    (context->mode == E_MAIL_FORMATTER_MODE_PRINTING)) {
		GList *head, *link;
		gboolean success = FALSE;

		if (extensions == NULL)
			return FALSE;

		if (context->mode == E_MAIL_FORMATTER_MODE_PRINTING) {
			gchar *name;
			EAttachment *attachment;
			GFileInfo *file_info;
			const gchar *display_name;
			gchar *description;

			attachment = e_mail_part_attachment_ref_attachment (
				E_MAIL_PART_ATTACHMENT (part));

			file_info = e_attachment_ref_file_info (attachment);
			display_name = g_file_info_get_display_name (file_info);

			description = e_attachment_dup_description (attachment);
			if (description != NULL && *description != '\0') {
				name = g_strdup_printf (
					"<h2>Attachment: %s (%s)</h2>\n",
					description, display_name);
			} else {
				name = g_strdup_printf (
					"<h2>Attachment: %s</h2>\n",
					display_name);
			}

			g_output_stream_write_all (
				stream, name, strlen (name),
				NULL, cancellable, NULL);

			g_free (description);
			g_free (name);

			g_object_unref (attachment);
			g_object_unref (file_info);
		}

		head = g_queue_peek_head_link (extensions);

		for (link = head; link != NULL; link = g_list_next (link)) {
			success = e_mail_formatter_extension_format (
				E_MAIL_FORMATTER_EXTENSION (link->data),
				formatter, context, part, stream, cancellable);
			if (success)
				break;
		}

		return success;
	}

	/* E_MAIL_FORMATTER_MODE_NORMAL: */

	mime_part = e_mail_part_ref_mime_part (part);
	text = e_mail_part_describe (mime_part, empa->snoop_mime_type);
	flags = e_mail_formatter_get_text_format_flags (formatter);
	html = camel_text_to_html (
		text, flags & CAMEL_MIME_FILTER_TOHTML_CONVERT_URLS, 0);
	g_free (text);
	g_object_unref (mime_part);

	if (empa->attachment_view_part_id)
		attachment_part_id = empa->attachment_view_part_id;
	else
		attachment_part_id = part_id;

	button_id = g_strconcat (attachment_part_id, ".attachment_button", NULL);

	/* XXX Wild guess at the initial size. */
	buffer = g_string_sized_new (8192);

	g_string_append_printf (
		buffer,
		"<div class=\"attachment\">"
		"<table width=\"100%%\" border=\"0\">"
		"<tr valign=\"middle\">"
		"<td align=\"left\" width=\"100\">"
		"<object type=\"application/vnd.evolution.widget.attachment-button\" "
		"height=\"20\" width=\"100\" data=\"%s\" id=\"%s\"></object>"
		"</td>"
		"<td align=\"left\">%s</td>"
		"</tr>", part_id, button_id, html);

	g_free (button_id);
	g_free (html);

	if (extensions != NULL) {
		GOutputStream *content_stream;
		gboolean success = FALSE;

		content_stream = g_memory_output_stream_new_resizable ();

		if (empa->attachment_view_part_id != NULL) {
			EMailPart *attachment_view_part;

			attachment_view_part = e_mail_part_list_ref_part (
				context->part_list,
				empa->attachment_view_part_id);

			/* Avoid recursion. */
			if (attachment_view_part == part)
				g_clear_object (&attachment_view_part);

			if (attachment_view_part != NULL) {
				success = e_mail_formatter_format_as (
					formatter, context,
					attachment_view_part,
					content_stream, NULL,
					cancellable);
				g_object_unref (attachment_view_part);
			}

		} else {
			GList *head, *link;

			head = g_queue_peek_head_link (extensions);

			for (link = head; link != NULL; link = g_list_next (link)) {
				success = e_mail_formatter_extension_format (
					E_MAIL_FORMATTER_EXTENSION (link->data),
					formatter, context,
					part, content_stream,
					cancellable);
				if (success)
					break;
			}
		}

		if (success) {
			gchar *wrapper_element_id;
			gconstpointer data;
			gsize size;

			wrapper_element_id = g_strconcat (
				attachment_part_id, ".wrapper", NULL);

			data = g_memory_output_stream_get_data (
				G_MEMORY_OUTPUT_STREAM (content_stream));
			size = g_memory_output_stream_get_data_size (
				G_MEMORY_OUTPUT_STREAM (content_stream));

			g_string_append_printf (
				buffer,
				"<tr><td colspan=\"2\">"
				"<div class=\"attachment-wrapper\" id=\"%s\">",
				wrapper_element_id);

			g_string_append_len (buffer, data, size);

			g_string_append (buffer, "</div></td></tr>");

			g_free (wrapper_element_id);
		}

		g_object_unref (content_stream);
	}

	g_string_append (buffer, "</table></div>");

	g_output_stream_write_all (
		stream, buffer->str, buffer->len, NULL, cancellable, NULL);

	g_string_free (buffer, TRUE);

	return TRUE;
}

static GtkWidget *
emfe_attachment_get_widget (EMailFormatterExtension *extension,
                            EMailPartList *context,
                            EMailPart *part,
                            GHashTable *params)
{
	EAttachment *attachment;
	EAttachmentStore *store;
	EAttachmentView *view;
	GtkWidget *widget;
	const gchar *part_id;

	g_return_val_if_fail (E_IS_MAIL_PART_ATTACHMENT (part), NULL);

	attachment = e_mail_part_attachment_ref_attachment (
		E_MAIL_PART_ATTACHMENT (part));

	part_id = e_mail_part_get_id (part);

	store = find_attachment_store (context, part);
	widget = e_attachment_button_new ();
	g_object_set_data_full (
		G_OBJECT (widget),
		"uri", g_strdup (part_id),
		(GDestroyNotify) g_free);
	e_attachment_button_set_attachment (
		E_ATTACHMENT_BUTTON (widget), attachment);

	view = g_object_get_data (G_OBJECT (store), "attachment-bar");
	if (view != NULL)
		e_attachment_button_set_view (
			E_ATTACHMENT_BUTTON (widget), view);

	gtk_widget_set_can_focus (widget, TRUE);
	gtk_widget_show (widget);

	g_object_unref (attachment);

	return widget;
}

static void
e_mail_formatter_attachment_class_init (EMailFormatterExtensionClass *class)
{
	class->display_name = _("Attachment");
	class->description = _("Display as attachment");
	class->mime_types = formatter_mime_types;
	class->priority = G_PRIORITY_LOW;
	class->format = emfe_attachment_format;
	class->get_widget = emfe_attachment_get_widget;
}

static void
e_mail_formatter_attachment_init (EMailFormatterExtension *extension)
{
}