/**
 * @file msg.c Message functions
 *
 * gaim
 *
 * Gaim is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * 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
 */
#include "msn.h"
#include "msg.h"

MsnMessage *
msn_message_new(void)
{
	MsnMessage *msg;

	msg = g_new0(MsnMessage, 1);

	msg->attr_table = g_hash_table_new_full(g_str_hash, g_str_equal,
											g_free, g_free);

	msn_message_ref(msg);

	return msg;
}

MsnMessage *
msn_message_new_plain(const char *message)
{
	MsnMessage *msg;
	char *message_cr;

	msg = msn_message_new();
	msn_message_set_attr(msg, "User-Agent", "Gaim/" VERSION);
	msn_message_set_content_type(msg, "text/plain");
	msn_message_set_charset(msg, "UTF-8");
	msn_message_set_flag(msg, 'N');
	msn_message_set_attr(msg, "X-MMS-IM-Format",
						 "FN=MS%20Sans%20Serif; EF=; CO=0; PF=0");

	message_cr = gaim_str_add_cr(message);
	msn_message_set_bin_data(msg, message_cr, strlen(message_cr));
	g_free(message_cr);

	return msg;
}

MsnMessage *
msn_message_new_msnslp(void)
{
	MsnMessage *msg;

	msg = msn_message_new();

	msn_message_set_attr(msg, "User-Agent", NULL);

	msg->msnslp_message = TRUE;

	msn_message_set_flag(msg, 'D');
	msn_message_set_content_type(msg, "application/x-msnmsgrp2p");

	return msg;
}

void
msn_message_parse_slp_body(MsnMessage *msg, const char *body, size_t len)
{
	MsnSlpHeader header;
	const char *tmp;

	tmp = body;

	/* Import the header. */
	memcpy(&header, tmp, sizeof(header));
	tmp += sizeof(header);

	msg->msnslp_header.session_id = GUINT32_FROM_LE(header.session_id);
	msg->msnslp_header.id         = GUINT32_FROM_LE(header.id);
	msg->msnslp_header.offset     = GUINT64_FROM_LE(header.offset);
	msg->msnslp_header.total_size = GUINT64_FROM_LE(header.total_size);
	msg->msnslp_header.length     = GUINT32_FROM_LE(header.length);
	msg->msnslp_header.flags      = GUINT32_FROM_LE(header.flags);
	msg->msnslp_header.ack_id     = GUINT32_FROM_LE(header.ack_id);
	msg->msnslp_header.ack_sub_id = GUINT32_FROM_LE(header.ack_sub_id);
	msg->msnslp_header.ack_size   = GUINT64_FROM_LE(header.ack_size);

	/* Import the body. */
	/* msg->body_len = msg->msnslp_header.length; */
	msg->body_len = len - (tmp - body);

	if (msg->body_len > 0)
		msg->body = g_memdup(tmp, msg->body_len);

	tmp += msg->body_len;
}

void
msn_message_parse_payload(MsnMessage *msg,
						  const char *payload, size_t payload_len)
{
	char *tmp_base, *tmp;
	const char *content_type;
	char *end;
	char **elems, **cur, **tokens;

	g_return_if_fail(payload != NULL);

	tmp_base = tmp = g_memdup(payload, payload_len + 1);
	tmp[payload_len] = '\0';

	/* Parse the attributes. */
	end = strstr(tmp, "\r\n\r\n");
	g_return_if_fail(end != NULL);
	*end = '\0';

	elems = g_strsplit(tmp, "\r\n", 0);

	for (cur = elems; *cur != NULL; cur++)
	{
		const char *key, *value;

		tokens = g_strsplit(*cur, ": ", 2);

		key = tokens[0];
		value = tokens[1];

		if (!strcmp(key, "MIME-Version"))
			continue;

		if (!strcmp(key, "Content-Type"))
		{
			char *charset, *c;

			if ((c = strchr(value, ';')) != NULL)
			{
				if ((charset = strchr(c, '=')) != NULL)
				{
					charset++;
					msn_message_set_charset(msg, charset);
				}

				*c = '\0';
			}

			msn_message_set_content_type(msg, value);
		}
		else
		{
			msn_message_set_attr(msg, key, value);
		}

		g_strfreev(tokens);
	}

	g_strfreev(elems);

	tmp = end + 4;

	/* Now we *should* be at the body. */
	content_type = msn_message_get_content_type(msg);

	if (content_type != NULL &&
		!strcmp(content_type, "application/x-msnmsgrp2p"))
	{
		MsnSlpHeader header;
		MsnSlpFooter footer;

		msg->msnslp_message = TRUE;

		/* Import the header. */
		memcpy(&header, tmp, sizeof(header));
		tmp += sizeof(header);

		msg->msnslp_header.session_id = GUINT32_FROM_LE(header.session_id);
		msg->msnslp_header.id         = GUINT32_FROM_LE(header.id);
		msg->msnslp_header.offset     = GUINT64_FROM_LE(header.offset);
		msg->msnslp_header.total_size = GUINT64_FROM_LE(header.total_size);
		msg->msnslp_header.length     = GUINT32_FROM_LE(header.length);
		msg->msnslp_header.flags      = GUINT32_FROM_LE(header.flags);
		msg->msnslp_header.ack_id     = GUINT32_FROM_LE(header.ack_id);
		msg->msnslp_header.ack_sub_id = GUINT32_FROM_LE(header.ack_sub_id);
		msg->msnslp_header.ack_size   = GUINT64_FROM_LE(header.ack_size);

		/* Import the body. */
		msg->body_len = payload_len - (tmp - tmp_base) - sizeof(footer);

		if (msg->body_len > 0)
			msg->body = g_memdup(tmp, msg->body_len);

		tmp += msg->body_len;

		/* Import the footer. */
		memcpy(&footer, tmp, sizeof(footer));
		tmp += sizeof(footer);

		msg->msnslp_footer.value = GUINT32_FROM_BE(footer.value);
	}
	else
	{
		msg->body_len = payload_len - (tmp - tmp_base);
		msg->body = g_memdup(tmp, msg->body_len);
	}

	g_free(tmp_base);
}

MsnMessage *
msn_message_new_from_cmd(MsnSession *session, MsnCommand *cmd)
{
	MsnMessage *msg;

	g_return_val_if_fail(cmd != NULL, NULL);

	msg = msn_message_new();

	msg->remote_user = g_strdup(cmd->params[0]);
	/* msg->size = atoi(cmd->params[2]); */
	msg->cmd = cmd;

	return msg;
}

void
msn_message_destroy(MsnMessage *msg)
{
	g_return_if_fail(msg != NULL);

	if (msg->ref_count > 0)
	{
		msn_message_unref(msg);

		return;
	}

	if (msg->remote_user != NULL)
		g_free(msg->remote_user);

	if (msg->body != NULL)
		g_free(msg->body);

	if (msg->content_type != NULL)
		g_free(msg->content_type);

	if (msg->charset != NULL)
		g_free(msg->charset);

	g_hash_table_destroy(msg->attr_table);
	g_list_free(msg->attr_list);

	g_free(msg);
}

MsnMessage *
msn_message_ref(MsnMessage *msg)
{
	g_return_val_if_fail(msg != NULL, NULL);

	msg->ref_count++;

	return msg;
}

MsnMessage *
msn_message_unref(MsnMessage *msg)
{
	g_return_val_if_fail(msg != NULL, NULL);

	if (msg->ref_count <= 0)
		return NULL;

	msg->ref_count--;

	if (msg->ref_count == 0)
	{
		msn_message_destroy(msg);

		return NULL;
	}

	return msg;
}

char *
msn_message_gen_slp_body(MsnMessage *msg, size_t *ret_size)
{
	MsnSlpHeader header;

	char *tmp, *base;
	const void *body;
	size_t len, body_len;

	g_return_val_if_fail(msg != NULL, NULL);

	len = MSN_BUF_LEN;

	base = tmp = g_malloc(len + 1);

	body = msn_message_get_bin_data(msg, &body_len);

	header.session_id = GUINT32_TO_LE(msg->msnslp_header.session_id);
	header.id         = GUINT32_TO_LE(msg->msnslp_header.id);
	header.offset     = GUINT64_TO_LE(msg->msnslp_header.offset);
	header.total_size = GUINT64_TO_LE(msg->msnslp_header.total_size);
	header.length     = GUINT32_TO_LE(msg->msnslp_header.length);
	header.flags      = GUINT32_TO_LE(msg->msnslp_header.flags);
	header.ack_id     = GUINT32_TO_LE(msg->msnslp_header.ack_id);
	header.ack_sub_id = GUINT32_TO_LE(msg->msnslp_header.ack_sub_id);
	header.ack_size   = GUINT64_TO_LE(msg->msnslp_header.ack_size);

	memcpy(tmp, &header, 48);
	tmp += 48;

	if (body != NULL)
	{
		memcpy(tmp, body, body_len);
		tmp += body_len;
	}

	if (ret_size != NULL)
		*ret_size = tmp - base;

	return base;
}

char *
msn_message_gen_payload(MsnMessage *msg, size_t *ret_size)
{
	GList *l;
	char *n, *base, *end;
	int len;
	size_t body_len;
	const void *body;

	g_return_val_if_fail(msg != NULL, NULL);

	len = MSN_BUF_LEN;

	base = n = end = g_malloc(len + 1);
	end += len;

	/* Standard header. */
	if (msg->charset == NULL)
	{
		g_snprintf(n, len,
				   "MIME-Version: 1.0\r\n"
				   "Content-Type: %s\r\n",
				   msg->content_type);
	}
	else
	{
		g_snprintf(n, len,
				   "MIME-Version: 1.0\r\n"
				   "Content-Type: %s; charset=%s\r\n",
				   msg->content_type, msg->charset);
	}

	n += strlen(n);

	for (l = msg->attr_list; l != NULL; l = l->next)
	{
		const char *key;
		const char *value;

		key = l->data;
		value = msn_message_get_attr(msg, key);

		g_snprintf(n, end - n, "%s: %s\r\n", key, value);
		n += strlen(n);
	}

	n += g_strlcpy(n, "\r\n", end - n);

	body = msn_message_get_bin_data(msg, &body_len);

	if (msg->msnslp_message)
	{
		MsnSlpHeader header;
		MsnSlpFooter footer;

		header.session_id = GUINT32_TO_LE(msg->msnslp_header.session_id);
		header.id         = GUINT32_TO_LE(msg->msnslp_header.id);
		header.offset     = GUINT64_TO_LE(msg->msnslp_header.offset);
		header.total_size = GUINT64_TO_LE(msg->msnslp_header.total_size);
		header.length     = GUINT32_TO_LE(msg->msnslp_header.length);
		header.flags      = GUINT32_TO_LE(msg->msnslp_header.flags);
		header.ack_id     = GUINT32_TO_LE(msg->msnslp_header.ack_id);
		header.ack_sub_id = GUINT32_TO_LE(msg->msnslp_header.ack_sub_id);
		header.ack_size   = GUINT64_TO_LE(msg->msnslp_header.ack_size);

		memcpy(n, &header, 48);
		n += 48;

		if (body != NULL)
		{
			memcpy(n, body, body_len);

			n += body_len;
		}

		footer.value = GUINT32_TO_BE(msg->msnslp_footer.value);

		memcpy(n, &footer, 4);
		n += 4;
	}
	else
	{
		if (body != NULL)
		{
			memcpy(n, body, body_len);
			n += body_len;
		}
	}

	if (ret_size != NULL)
	{
		if (*ret_size > 1664)
			*ret_size = 1664;

		*ret_size = n - base;
	}

	return base;
}

void
msn_message_set_flag(MsnMessage *msg, char flag)
{
	g_return_if_fail(msg != NULL);
	g_return_if_fail(flag != 0);

	msg->flag = flag;
}

char
msn_message_get_flag(const MsnMessage *msg)
{
	g_return_val_if_fail(msg != NULL, 0);

	return msg->flag;
}

void
msn_message_set_bin_data(MsnMessage *msg, const void *data, size_t len)
{
	g_return_if_fail(msg != NULL);

	/* There is no need to waste memory on data we cannot send anyway */
	if (len > 1664)
		len = 1664;

	if (msg->body != NULL)
		g_free(msg->body);

	if (data != NULL && len > 0)
	{
		msg->body = g_memdup(data, len);
		msg->body_len = len;
	}
	else
	{
		msg->body = NULL;
		msg->body_len = 0;
	}
}

const void *
msn_message_get_bin_data(const MsnMessage *msg, size_t *len)
{
	g_return_val_if_fail(msg != NULL, NULL);

	if (len)
		*len = msg->body_len;

	return msg->body;
}

void
msn_message_set_content_type(MsnMessage *msg, const char *type)
{
	g_return_if_fail(msg != NULL);

	if (msg->content_type != NULL)
		g_free(msg->content_type);

	msg->content_type = (type != NULL) ? g_strdup(type) : NULL;
}

const char *
msn_message_get_content_type(const MsnMessage *msg)
{
	g_return_val_if_fail(msg != NULL, NULL);

	return msg->content_type;
}

void
msn_message_set_charset(MsnMessage *msg, const char *charset)
{
	g_return_if_fail(msg != NULL);

	if (msg->charset != NULL)
		g_free(msg->charset);

	msg->charset = (charset != NULL) ? g_strdup(charset) : NULL;
}

const char *
msn_message_get_charset(const MsnMessage *msg)
{
	g_return_val_if_fail(msg != NULL, NULL);

	return msg->charset;
}

void
msn_message_set_attr(MsnMessage *msg, const char *attr, const char *value)
{
	const char *temp;
	char *new_attr;

	g_return_if_fail(msg != NULL);
	g_return_if_fail(attr != NULL);

	temp = msn_message_get_attr(msg, attr);

	if (value == NULL)
	{
		if (temp != NULL)
		{
			GList *l;

			for (l = msg->attr_list; l != NULL; l = l->next)
			{
				if (!g_ascii_strcasecmp(l->data, attr))
				{
					msg->attr_list = g_list_remove(msg->attr_list, l->data);

					break;
				}
			}

			g_hash_table_remove(msg->attr_table, attr);
		}

		return;
	}

	new_attr = g_strdup(attr);

	g_hash_table_insert(msg->attr_table, new_attr, g_strdup(value));

	if (temp == NULL)
		msg->attr_list = g_list_append(msg->attr_list, new_attr);
}

const char *
msn_message_get_attr(const MsnMessage *msg, const char *attr)
{
	g_return_val_if_fail(msg != NULL, NULL);
	g_return_val_if_fail(attr != NULL, NULL);

	return g_hash_table_lookup(msg->attr_table, attr);
}

GHashTable *
msn_message_get_hashtable_from_body(const MsnMessage *msg)
{
	GHashTable *table;
	const char *body;
	char **elems, **cur, **tokens;

	g_return_val_if_fail(msg != NULL, NULL);

	table = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);

	body = msn_message_get_bin_data(msg, NULL);

	g_return_val_if_fail(body != NULL, NULL);

	elems = g_strsplit(body, "\r\n", 0);

	for (cur = elems; *cur != NULL; cur++)
	{
		if (**cur == '\0')
			break;

		tokens = g_strsplit(*cur, ": ", 2);

		if (tokens[0] != NULL && tokens[1] != NULL)
			g_hash_table_insert(table, tokens[0], tokens[1]);

		g_free(tokens);
	}

	g_strfreev(elems);

	return table;
}

void
msn_message_show_readable(MsnMessage *msg, const char *info,
						  gboolean text_body)
{
	GString *str;
	size_t body_len;
	const char *body;
	GList *l;

	g_return_if_fail(msg != NULL);

	str = g_string_new(NULL);

	/* Standard header. */
	if (msg->charset == NULL)
	{
		g_string_append_printf(str,
				   "MIME-Version: 1.0\r\n"
				   "Content-Type: %s\r\n",
				   msg->content_type);
	}
	else
	{
		g_string_append_printf(str,
				   "MIME-Version: 1.0\r\n"
				   "Content-Type: %s; charset=%s\r\n",
				   msg->content_type, msg->charset);
	}

	for (l = msg->attr_list; l; l = l->next)
	{
		char *key;
		const char *value;

		key = l->data;
		value = msn_message_get_attr(msg, key);

		g_string_append_printf(str, "%s: %s\r\n", key, value);
	}

	g_string_append(str, "\r\n");

	body = msn_message_get_bin_data(msg, &body_len);

	if (msg->msnslp_message)
	{
		g_string_append_printf(str, "%u ", msg->msnslp_header.session_id);
		g_string_append_printf(str, "%u ", msg->msnslp_header.id);
		g_string_append_printf(str, "%llu ", msg->msnslp_header.offset);
		g_string_append(str, "\r\n");
		g_string_append_printf(str, "%llu ",
							   msg->msnslp_header.total_size);
		g_string_append_printf(str, "%u ", msg->msnslp_header.length);
		g_string_append_printf(str, "%u ", msg->msnslp_header.flags);
		g_string_append(str, "\r\n");
		g_string_append_printf(str, "%u ", msg->msnslp_header.ack_id);
		g_string_append_printf(str, "%u ", msg->msnslp_header.ack_sub_id);
		g_string_append_printf(str, "%lld ", msg->msnslp_header.ack_size);
		g_string_append(str, "\r\n");

		if (body != NULL)
		{
			if (text_body)
			{
				g_string_append_len(str, body, body_len);
				if (body[body_len - 1] == '\0')
				{
					str->len--;
					g_string_append(str, " 0x00");
				}
				g_string_append(str, "\r\n");
			}
			else
			{
				int i;
				for (i = 0; i < msg->body_len; i++)
				{
					g_string_append_printf(str, "%.2hhX ", body[i]);
					if ((i % 16) == 15)
						g_string_append(str, "\r\n");
				}
				g_string_append(str, "\r\n");
			}
		}

		g_string_append_printf(str, "%u ", msg->msnslp_footer.value);
		g_string_append(str, "\r\n");
	}
	else
	{
		if (body != NULL)
		{
			g_string_append_len(str, body, body_len);
			g_string_append(str, "\r\n");
		}
	}

	gaim_debug_info("msn", "Message %s:\n{%s}\n", info, str->str);

	g_string_free(str, TRUE);
}