/*
 *
 * 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:
 *		Jeffrey Stedfast <fejj@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <string.h>

#include <camel/camel-iconv.h>
#include <camel/camel-stream-filter.h>
#include <camel/camel-mime-filter-linewrap.h>
#include <camel/camel-mime-filter-tohtml.h>
#include <camel/camel-mime-filter-enriched.h>
#include <camel/camel-string-utils.h>
#include <camel/camel-mime-message.h>
#include <camel/camel-url.h>

#include <glib/gi18n.h>
#include <gconf/gconf-client.h>

#include "em-stripsig-filter.h"
#include "em-format-quote.h"

struct _EMFormatQuotePrivate {
	gint dummy;
};

static void emfq_format_clone(EMFormat *, CamelFolder *, const gchar *, CamelMimeMessage *, EMFormat *);
static void emfq_format_error(EMFormat *emf, CamelStream *stream, const gchar *txt);
static void emfq_format_message(EMFormat *, CamelStream *, CamelMimePart *, const EMFormatHandler *);
static void emfq_format_source(EMFormat *, CamelStream *, CamelMimePart *);
static void emfq_format_attachment(EMFormat *, CamelStream *, CamelMimePart *, const gchar *, const EMFormatHandler *);

static void emfq_builtin_init(EMFormatQuoteClass *efhc);

static gpointer parent_class;

static void
emfq_init(GObject *o)
{
	EMFormatQuote *emfq =(EMFormatQuote *) o;

	/* we want to convert url's etc */
	emfq->text_html_flags = CAMEL_MIME_FILTER_TOHTML_PRE | CAMEL_MIME_FILTER_TOHTML_CONVERT_URLS
		| CAMEL_MIME_FILTER_TOHTML_CONVERT_ADDRESSES;
}

static void
emfq_finalize (GObject *object)
{
	EMFormatQuote *emfq =(EMFormatQuote *) object;

	if (emfq->stream)
		camel_object_unref(emfq->stream);
	g_free(emfq->credits);

	/* Chain up to parent's finalize() method. */
	G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
emfq_base_init(EMFormatQuoteClass *emfqclass)
{
	emfq_builtin_init(emfqclass);
}

static void
emfq_class_init (EMFormatQuoteClass *class)
{
	GObjectClass *object_class;
	EMFormatClass *format_class;

	parent_class = g_type_class_peek_parent (class);
	g_type_class_add_private (class, sizeof (EMFormatQuotePrivate));

	object_class = G_OBJECT_CLASS (class);
	object_class->finalize = emfq_finalize;

	format_class = EM_FORMAT_CLASS (class);
	format_class->format_clone = emfq_format_clone;
	format_class->format_error = emfq_format_error;
	format_class->format_source = emfq_format_source;
	format_class->format_attachment = emfq_format_attachment;
}

GType
em_format_quote_get_type (void)
{
	static GType type = 0;

	if (G_UNLIKELY (type == 0)) {
		static const GTypeInfo type_info = {
			sizeof (EMFormatQuoteClass),
			(GBaseInitFunc) emfq_base_init,
			(GBaseFinalizeFunc) NULL,
			(GClassInitFunc) emfq_class_init,
			(GClassFinalizeFunc) NULL,
			NULL,  /* class_data */
			sizeof (EMFormatQuote),
			0,     /* n_preallocs */
			(GInstanceInitFunc) emfq_init,
			NULL   /* value_table */
		};

		type = g_type_register_static (
			EM_TYPE_FORMAT, "EMFormatQuote", &type_info, 0);
	}

	return type;
}

EMFormatQuote *
em_format_quote_new (const gchar *credits,
                     CamelStream *stream,
                     guint32 flags)
{
	EMFormatQuote *emfq;

	emfq = g_object_new (EM_TYPE_FORMAT_QUOTE, NULL);

	emfq->credits = g_strdup (credits);
	emfq->stream = stream;
	camel_object_ref (stream);
	emfq->flags = flags;

	return emfq;
}

static void
emfq_format_empty_line(EMFormat *emf, CamelStream *stream, CamelMimePart *part, const EMFormatHandler *info)
{
	camel_stream_printf(stream, "<br>\n");
}

static void
emfq_format_clone(EMFormat *emf, CamelFolder *folder, const gchar *uid, CamelMimeMessage *msg, EMFormat *src)
{
	EMFormatQuote *emfq = (EMFormatQuote *) emf;
	const EMFormatHandler *handle;
	GConfClient *gconf;

	/* Chain up to parent's format_clone() method. */
	EM_FORMAT_CLASS (parent_class)->format_clone (emf, folder, uid, msg, src);

	gconf = gconf_client_get_default ();
	camel_stream_reset(emfq->stream);
	if (gconf_client_get_bool(gconf, "/apps/evolution/mail/composer/top_signature", NULL))
		emfq_format_empty_line(emf, emfq->stream, (CamelMimePart *)msg, NULL);
	g_object_unref (gconf);
	handle = em_format_find_handler(emf, "x-evolution/message/prefix");
	if (handle)
		handle->handler(emf, emfq->stream, (CamelMimePart *)msg, handle);
	handle = em_format_find_handler(emf, "x-evolution/message/rfc822");
	if (handle)
		handle->handler(emf, emfq->stream, (CamelMimePart *)msg, handle);

	camel_stream_flush(emfq->stream);

	g_signal_emit_by_name(emf, "complete");
}

static void
emfq_format_error(EMFormat *emf, CamelStream *stream, const gchar *txt)
{
	/* FIXME: should we even bother writing error text for quoting? probably not... */
}

static void
emfq_format_text_header (EMFormatQuote *emfq, CamelStream *stream, const gchar *label, const gchar *value, guint32 flags, gint is_html)
{
	const gchar *html;
	gchar *mhtml = NULL;

	if (value == NULL)
		return;

	while (*value == ' ')
		value++;

	if (!is_html)
		html = mhtml = camel_text_to_html (value, 0, 0);
	else
		html = value;

	if (flags & EM_FORMAT_HEADER_BOLD)
		camel_stream_printf (stream, "<b>%s</b>: %s<br>", label, html);
	else
		camel_stream_printf (stream, "%s: %s<br>", label, html);

	g_free (mhtml);
}

static const gchar *addrspec_hdrs[] = {
	"Sender", "From", "Reply-To", "To", "Cc", "Bcc",
	"Resent-Sender", "Resent-from", "Resent-Reply-To",
	"Resent-To", "Resent-cc", "Resent-Bcc", NULL
};

#if 0
/* FIXME: include Sender and Resent-* headers too? */
/* For Translators only: The following strings are used in the header table in the preview pane */
static gchar *i18n_hdrs[] = {
	N_("From"), N_("Reply-To"), N_("To"), N_("Cc"), N_("Bcc")
};
#endif

static void
emfq_format_address (GString *out, struct _camel_header_address *a)
{
	guint32 flags = CAMEL_MIME_FILTER_TOHTML_CONVERT_SPACES;
	gchar *name, *mailto, *addr;

	while (a) {
		if (a->name)
			name = camel_text_to_html (a->name, flags, 0);
		else
			name = NULL;

		switch (a->type) {
		case CAMEL_HEADER_ADDRESS_NAME:
			if (name && *name) {
				gchar *real, *mailaddr;

				g_string_append_printf (out, "%s &lt;", name);
				/* rfc2368 for mailto syntax and url encoding extras */
				if ((real = camel_header_encode_phrase ((guchar *)a->name))) {
					mailaddr = g_strdup_printf ("%s <%s>", real, a->v.addr);
					g_free (real);
					mailto = camel_url_encode (mailaddr, "?=&()");
					g_free (mailaddr);
				} else {
					mailto = camel_url_encode (a->v.addr, "?=&()");
				}
			} else {
				mailto = camel_url_encode (a->v.addr, "?=&()");
			}
			addr = camel_text_to_html (a->v.addr, flags, 0);
			g_string_append_printf (out, "<a href=\"mailto:%s\">%s</a>", mailto, addr);
			g_free (mailto);
			g_free (addr);

			if (name && *name)
				g_string_append (out, "&gt;");
			break;
		case CAMEL_HEADER_ADDRESS_GROUP:
			g_string_append_printf (out, "%s: ", name);
			emfq_format_address (out, a->v.members);
			g_string_append_printf (out, ";");
			break;
		default:
			g_warning ("Invalid address type");
			break;
		}

		g_free (name);

		a = a->next;
		if (a)
			g_string_append (out, ", ");
	}
}

static void
canon_header_name (gchar *name)
{
	gchar *inptr = name;

	/* canonicalise the header name... first letter is
	 * capitalised and any letter following a '-' also gets
	 * capitalised */

	if (*inptr >= 'a' && *inptr <= 'z')
		*inptr -= 0x20;

	inptr++;

	while (*inptr) {
		if (inptr[-1] == '-' && *inptr >= 'a' && *inptr <= 'z')
			*inptr -= 0x20;
		else if (*inptr >= 'A' && *inptr <= 'Z')
			*inptr += 0x20;

		inptr++;
	}
}

static void
emfq_format_header (EMFormat *emf, CamelStream *stream, CamelMedium *part, const gchar *namein, guint32 flags, const gchar *charset)
{
	CamelMimeMessage *msg = (CamelMimeMessage *) part;
	EMFormatQuote *emfq = (EMFormatQuote *) emf;
	gchar *name, *buf, *value = NULL;
	const gchar *txt, *label;
	gboolean addrspec = FALSE;
	gint is_html = FALSE;
	gint i;

	name = g_alloca (strlen (namein) + 1);
	strcpy (name, namein);
	canon_header_name (name);

	for (i = 0; addrspec_hdrs[i]; i++) {
		if (!strcmp (name, addrspec_hdrs[i])) {
			addrspec = TRUE;
			break;
		}
	}

	label = _(name);

	if (addrspec) {
		struct _camel_header_address *addrs;
		GString *html;

		if (!(txt = camel_medium_get_header (part, name)))
			return;

		buf = camel_header_unfold (txt);
		if (!(addrs = camel_header_address_decode (txt, emf->charset ? emf->charset : emf->default_charset))) {
			g_free (buf);
			return;
		}

		g_free (buf);

		html = g_string_new ("");
		emfq_format_address (html, addrs);
		camel_header_address_unref (addrs);
		txt = value = html->str;
		g_string_free (html, FALSE);
		flags |= EM_FORMAT_HEADER_BOLD;
		is_html = TRUE;
	} else if (!strcmp (name, "Subject")) {
		txt = camel_mime_message_get_subject (msg);
		label = _("Subject");
		flags |= EM_FORMAT_HEADER_BOLD;
	} else if (!strcmp (name, "X-Evolution-Mailer")) { /* pseudo-header */
		if (!(txt = camel_medium_get_header (part, "x-mailer")))
			if (!(txt = camel_medium_get_header (part, "user-agent")))
				if (!(txt = camel_medium_get_header (part, "x-newsreader")))
					if (!(txt = camel_medium_get_header (part, "x-mimeole")))
						return;

		txt = value = camel_header_format_ctext (txt, charset);

		label = _("Mailer");
		flags |= EM_FORMAT_HEADER_BOLD;
	} else if (!strcmp (name, "Date") || !strcmp (name, "Resent-Date")) {
		if (!(txt = camel_medium_get_header (part, name)))
			return;

		flags |= EM_FORMAT_HEADER_BOLD;
	} else {
		txt = camel_medium_get_header (part, name);
		buf = camel_header_unfold (txt);
		txt = value = camel_header_decode_string (txt, charset);
		g_free (buf);
	}

	emfq_format_text_header (emfq, stream, label, txt, flags, is_html);

	g_free (value);
}

static void
emfq_format_headers (EMFormatQuote *emfq, CamelStream *stream, CamelMedium *part)
{
	EMFormat *emf = (EMFormat *) emfq;
	CamelContentType *ct;
	const gchar *charset;
	GList *link;

	if (!part)
		return;

	ct = camel_mime_part_get_content_type ((CamelMimePart *) part);
	charset = camel_content_type_param (ct, "charset");
	charset = camel_iconv_charset_name (charset);

	/* dump selected headers */
	link = g_queue_peek_head_link (&emf->header_list);
	while (link != NULL) {
		EMFormatHeader *h = link->data;
		emfq_format_header (
			emf, stream, part, h->name, h->flags, charset);
		link = g_list_next (link);
	}

	camel_stream_printf(stream, "<br>\n");
}

static void
emfq_format_message_prefix(EMFormat *emf, CamelStream *stream, CamelMimePart *part, const EMFormatHandler *info)
{
	EMFormatQuote *emfq = (EMFormatQuote *) emf;

	if (emfq->credits)
		camel_stream_printf(stream, "%s<br>\n", emfq->credits);
}

static void
emfq_format_message(EMFormat *emf, CamelStream *stream, CamelMimePart *part, const EMFormatHandler *info)
{
	EMFormatQuote *emfq = (EMFormatQuote *) emf;

	if (emfq->flags & EM_FORMAT_QUOTE_CITE)
		camel_stream_printf(stream, "<!--+GtkHTML:<DATA class=\"ClueFlow\" key=\"orig\" value=\"1\">-->\n"
				    "<blockquote type=cite>\n");

	if (((CamelMimePart *)emf->message) != part) {
		camel_stream_printf(stream,  "%s</br>\n", _("-------- Forwarded Message --------"));
		emfq_format_headers (emfq, stream, (CamelMedium *)part);
	} else if (emfq->flags & EM_FORMAT_QUOTE_HEADERS)
		emfq_format_headers (emfq, stream, (CamelMedium *)part);

	em_format_part (emf, stream, part);

	if (emfq->flags & EM_FORMAT_QUOTE_CITE)
		camel_stream_write_string(stream, "</blockquote><!--+GtkHTML:<DATA class=\"ClueFlow\" clear=\"orig\">-->");
}

static void
emfq_format_source(EMFormat *emf, CamelStream *stream, CamelMimePart *part)
{
	CamelStreamFilter *filtered_stream;
	CamelMimeFilter *html_filter;

	filtered_stream = camel_stream_filter_new_with_stream ((CamelStream *) stream);
	html_filter = camel_mime_filter_tohtml_new (CAMEL_MIME_FILTER_TOHTML_CONVERT_NL
						    | CAMEL_MIME_FILTER_TOHTML_CONVERT_SPACES
						    | CAMEL_MIME_FILTER_TOHTML_ESCAPE_8BIT, 0);
	camel_stream_filter_add(filtered_stream, html_filter);
	camel_object_unref(html_filter);

	em_format_format_text(emf, (CamelStream *)filtered_stream, (CamelDataWrapper *)part);
	camel_object_unref(filtered_stream);
}

static void
emfq_format_attachment(EMFormat *emf, CamelStream *stream, CamelMimePart *part, const gchar *mime_type, const EMFormatHandler *handle)
{
	if (handle && em_format_is_inline(emf, emf->part_id->str, part, handle)) {
		gchar *text, *html;

		camel_stream_write_string(stream,
					  "<table border=1 cellspacing=0 cellpadding=0><tr><td><font size=-1>\n");

		/* output some info about it */
		text = em_format_describe_part(part, mime_type);
		html = camel_text_to_html(text, ((EMFormatQuote *)emf)->text_html_flags & CAMEL_MIME_FILTER_TOHTML_CONVERT_URLS, 0);
		camel_stream_write_string(stream, html);
		g_free(html);
		g_free(text);

		camel_stream_write_string(stream, "</font></td></tr></table>");

		handle->handler(emf, stream, part, handle);
	}
}

#include <camel/camel-medium.h>
#include <camel/camel-mime-part.h>
#include <camel/camel-multipart.h>
#include <camel/camel-url.h>

static void
emfq_text_plain(EMFormatQuote *emfq, CamelStream *stream, CamelMimePart *part, EMFormatHandler *info)
{
	CamelStreamFilter *filtered_stream;
	CamelMimeFilter *html_filter;
	CamelMimeFilter *sig_strip;
	CamelMimeFilter *wrap_filter;
	CamelContentType *type;
	const gchar *format;
	guint32 rgb = 0x737373, flags;

	if (!part)
		return;

	flags = emfq->text_html_flags;

	/* Check for RFC 2646 flowed text. */
	type = camel_mime_part_get_content_type(part);
	if (camel_content_type_is(type, "text", "plain")
	    && (format = camel_content_type_param(type, "format"))
	    && !g_ascii_strcasecmp(format, "flowed"))
		flags |= CAMEL_MIME_FILTER_TOHTML_FORMAT_FLOWED;

	filtered_stream = camel_stream_filter_new_with_stream(stream);

	if ((emfq->flags & EM_FORMAT_QUOTE_KEEP_SIG) == 0) {
		sig_strip = em_stripsig_filter_new ();
		camel_stream_filter_add (filtered_stream, sig_strip);
		camel_object_unref (sig_strip);
	}

	wrap_filter = camel_mime_filter_linewrap_new (70, 70, 0, CAMEL_MIME_FILTER_LINEWRAP_WORD);
	camel_stream_filter_add (filtered_stream, wrap_filter);
	camel_object_unref (wrap_filter);

	html_filter = camel_mime_filter_tohtml_new(flags, rgb);
	camel_stream_filter_add(filtered_stream, html_filter);
	camel_object_unref(html_filter);

	em_format_format_text((EMFormat *)emfq, (CamelStream *)filtered_stream, (CamelDataWrapper *)part);
	camel_stream_flush((CamelStream *)filtered_stream);
	camel_object_unref(filtered_stream);
}

static void
emfq_text_enriched(EMFormatQuote *emfq, CamelStream *stream, CamelMimePart *part, EMFormatHandler *info)
{
	CamelStreamFilter *filtered_stream;
	CamelMimeFilter *enriched;
	CamelDataWrapper *dw;
	guint32 flags = 0;

	dw = camel_medium_get_content_object((CamelMedium *)part);

	if (!strcmp(info->mime_type, "text/richtext")) {
		flags = CAMEL_MIME_FILTER_ENRICHED_IS_RICHTEXT;
		camel_stream_write_string(stream, "\n<!-- text/richtext -->\n");
	} else {
		camel_stream_write_string(stream, "\n<!-- text/enriched -->\n");
	}

	enriched = camel_mime_filter_enriched_new(flags);
	filtered_stream = camel_stream_filter_new_with_stream (stream);
	camel_stream_filter_add(filtered_stream, enriched);
	camel_object_unref(enriched);

	camel_stream_write_string(stream, "<br><hr><br>");
	em_format_format_text((EMFormat *)emfq, (CamelStream *)filtered_stream, (CamelDataWrapper *)part);
	camel_object_unref(filtered_stream);
}

static void
emfq_text_html(EMFormat *emf, CamelStream *stream, CamelMimePart *part, EMFormatHandler *info)
{
	camel_stream_write_string(stream, "\n<!-- text/html -->\n");
	em_format_format_text(emf, stream, (CamelDataWrapper *)part);
}

static void
emfq_ignore(EMFormat *emf, CamelStream *stream, CamelMimePart *part, EMFormatHandler *info)
{
	/* NOOP */
}

static EMFormatHandler type_builtin_table[] = {
	{ (gchar *) "text/plain", (EMFormatFunc)emfq_text_plain },
	{ (gchar *) "text/enriched", (EMFormatFunc)emfq_text_enriched },
	{ (gchar *) "text/richtext", (EMFormatFunc)emfq_text_enriched },
	{ (gchar *) "text/html", (EMFormatFunc)emfq_text_html },
/*	{ (gchar *) "multipart/related",(EMFormatFunc)emfq_multipart_related },*/
	{ (gchar *) "message/external-body", (EMFormatFunc)emfq_ignore },
	{ (gchar *) "multipart/appledouble", (EMFormatFunc)emfq_ignore },

	/* internal evolution types */
	{ (gchar *) "x-evolution/evolution-rss-feed", (EMFormatFunc)emfq_text_html },
	{ (gchar *) "x-evolution/message/rfc822", (EMFormatFunc)emfq_format_message },
	{ (gchar *) "x-evolution/message/prefix", (EMFormatFunc)emfq_format_message_prefix },
};

static void
emfq_builtin_init(EMFormatQuoteClass *efhc)
{
	gint i;

	for (i = 0; i < G_N_ELEMENTS (type_builtin_table); i++)
		em_format_class_add_handler((EMFormatClass *)efhc, &type_builtin_table[i]);
}