/***************************************************************************\
*                                                                           *
*  BitlBee - An IRC to IM gateway                                           *
*  Simple module to facilitate twitter functionality.                       *
*                                                                           *
*  Copyright 2009-2010 Geert Mulders <g.c.w.m.mulders@gmail.com>            *
*  Copyright 2010-2011 Wilmer van der Gaast <wilmer@gaast.net>              *
*                                                                           *
*  This library 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, version            *
*  2.1.                                                                     *
*                                                                           *
*  This library 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 this library; if not, write to the Free Software Foundation,  *
*  Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA           *
*                                                                           *
****************************************************************************/

/* For strptime(): */
#if(__sun)
#else
#define _XOPEN_SOURCE
#endif

#include "twitter_http.h"
#include "twitter.h"
#include "bitlbee.h"
#include "url.h"
#include "misc.h"
#include "base64.h"
#include "xmltree.h"
#include "twitter_lib.h"
#include <ctype.h>
#include <errno.h>

/* GLib < 2.12.0 doesn't have g_ascii_strtoll(), work around using system strtoll(). */
/* GLib < 2.12.4 can be buggy: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=488013 */
#if !GLIB_CHECK_VERSION(2,12,5)
#include <stdlib.h>
#include <limits.h>
#define g_ascii_strtoll strtoll
#endif

#define TXL_STATUS 1
#define TXL_USER 2
#define TXL_ID 3

struct twitter_xml_list {
	int type;
	gint64 next_cursor;
	GSList *list;
};

struct twitter_xml_user {
	char *name;
	char *screen_name;
};

struct twitter_xml_status {
	time_t created_at;
	char *text;
	struct twitter_xml_user *user;
	guint64 id, reply_to;
};

static void twitter_groupchat_init(struct im_connection *ic);

/**
 * Frees a twitter_xml_user struct.
 */
static void txu_free(struct twitter_xml_user *txu)
{
	if (txu == NULL)
		return;

	g_free(txu->name);
	g_free(txu->screen_name);
	g_free(txu);
}

/**
 * Frees a twitter_xml_status struct.
 */
static void txs_free(struct twitter_xml_status *txs)
{
	if (txs == NULL)
		return;

	g_free(txs->text);
	txu_free(txs->user);
	g_free(txs);
}

/**
 * Free a twitter_xml_list struct.
 * type is the type of list the struct holds.
 */
static void txl_free(struct twitter_xml_list *txl)
{
	GSList *l;
	if (txl == NULL)
		return;

	for (l = txl->list; l; l = g_slist_next(l)) {
		if (txl->type == TXL_STATUS) {
			txs_free((struct twitter_xml_status *) l->data);
		} else if (txl->type == TXL_ID) {
			g_free(l->data);
		} else if (txl->type == TXL_USER) {
			txu_free(l->data);
		}
	}

	g_slist_free(txl->list);
	g_free(txl);
}

/**
 * Compare status elements
 */
static gint twitter_compare_elements(gconstpointer a, gconstpointer b)
{
	struct twitter_xml_status *a_status = (struct twitter_xml_status *) a;
	struct twitter_xml_status *b_status = (struct twitter_xml_status *) b;

	if (a_status->created_at < b_status->created_at) {
		return -1;
	} else if (a_status->created_at > b_status->created_at) {
		return 1;
	} else {
		return 0;
	}
}

/**
 * Add a buddy if it is not already added, set the status to logged in.
 */
static void twitter_add_buddy(struct im_connection *ic, char *name, const char *fullname)
{
	struct twitter_data *td = ic->proto_data;

	// Check if the buddy is already in the buddy list.
	if (!bee_user_by_handle(ic->bee, ic, name)) {
		char *mode = set_getstr(&ic->acc->set, "mode");

		// The buddy is not in the list, add the buddy and set the status to logged in.
		imcb_add_buddy(ic, name, NULL);
		imcb_rename_buddy(ic, name, fullname);
		if (g_strcasecmp(mode, "chat") == 0) {
			/* Necessary so that nicks always get translated to the
			   exact Twitter username. */
			imcb_buddy_nick_hint(ic, name, name);
			imcb_chat_add_buddy(td->timeline_gc, name);
		} else if (g_strcasecmp(mode, "many") == 0)
			imcb_buddy_status(ic, name, OPT_LOGGED_IN, NULL, NULL);
	}
}

/* Warning: May return a malloc()ed value, which will be free()d on the next
   call. Only for short-term use. NOT THREADSAFE!  */
char *twitter_parse_error(struct http_request *req)
{
	static char *ret = NULL;
	struct xt_parser *xp = NULL;
	struct xt_node *node, *err;

	g_free(ret);
	ret = NULL;

	if (req->body_size > 0) {
		xp = xt_new(NULL, NULL);
		xt_feed(xp, req->reply_body, req->body_size);
		
		for (node = xp->root; node; node = node->next)
			if ((err = xt_find_node(node->children, "error")) && err->text_len > 0) {
				ret = g_strdup_printf("%s (%s)", req->status_string, err->text);
				break;
			}

		xt_free(xp);
	}

	return ret ? ret : req->status_string;
}

static void twitter_http_get_friends_ids(struct http_request *req);

/**
 * Get the friends ids.
 */
void twitter_get_friends_ids(struct im_connection *ic, gint64 next_cursor)
{
	// Primitive, but hey! It works...      
	char *args[2];
	args[0] = "cursor";
	args[1] = g_strdup_printf("%lld", (long long) next_cursor);
	twitter_http(ic, TWITTER_FRIENDS_IDS_URL, twitter_http_get_friends_ids, ic, 0, args, 2);

	g_free(args[1]);
}

/**
 * Function to help fill a list.
 */
static xt_status twitter_xt_next_cursor(struct xt_node *node, struct twitter_xml_list *txl)
{
	char *end = NULL;

	if (node->text)
		txl->next_cursor = g_ascii_strtoll(node->text, &end, 10);
	if (end == NULL)
		txl->next_cursor = -1;

	return XT_HANDLED;
}

/**
 * Fill a list of ids.
 */
static xt_status twitter_xt_get_friends_id_list(struct xt_node *node, struct twitter_xml_list *txl)
{
	struct xt_node *child;

	// Set the list type.
	txl->type = TXL_ID;

	// The root <statuses> node should hold the list of statuses <status>
	// Walk over the nodes children.
	for (child = node->children; child; child = child->next) {
		if (g_strcasecmp("ids", child->name) == 0) {
			struct xt_node *idc;
			for (idc = child->children; idc; idc = idc->next)
				if (g_strcasecmp(idc->name, "id") == 0)
					txl->list = g_slist_prepend(txl->list,
						g_memdup(idc->text, idc->text_len + 1));
		} else if (g_strcasecmp("next_cursor", child->name) == 0) {
			twitter_xt_next_cursor(child, txl);
		}
	}

	return XT_HANDLED;
}

static void twitter_get_users_lookup(struct im_connection *ic);

/**
 * Callback for getting the friends ids.
 */
static void twitter_http_get_friends_ids(struct http_request *req)
{
	struct im_connection *ic;
	struct xt_parser *parser;
	struct twitter_xml_list *txl;
	struct twitter_data *td;

	ic = req->data;

	// Check if the connection is still active.
	if (!g_slist_find(twitter_connections, ic))
		return;

	td = ic->proto_data;

	// Check if the HTTP request went well. More strict checks as this is
	// the first request we do in a session.
	if (req->status_code == 401) {
		imcb_error(ic, "Authentication failure");
		imc_logout(ic, FALSE);
		return;
	} else if (req->status_code != 200) {
		// It didn't go well, output the error and return.
		imcb_error(ic, "Could not retrieve %s: %s",
			   TWITTER_FRIENDS_IDS_URL, twitter_parse_error(req));
		imc_logout(ic, TRUE);
		return;
	} else {
		td->http_fails = 0;
	}

	/* Create the room now that we "logged in". */
	if (!td->timeline_gc && g_strcasecmp(set_getstr(&ic->acc->set, "mode"), "chat") == 0)
		twitter_groupchat_init(ic);

	txl = g_new0(struct twitter_xml_list, 1);
	txl->list = td->follow_ids;

	// Parse the data.
	parser = xt_new(NULL, txl);
	xt_feed(parser, req->reply_body, req->body_size);
	twitter_xt_get_friends_id_list(parser->root, txl);
	xt_free(parser);

	td->follow_ids = txl->list;
	if (txl->next_cursor)
		/* These were just numbers. Up to 4000 in a response AFAIK so if we get here
		   we may be using a spammer account. \o/ */
		twitter_get_friends_ids(ic, txl->next_cursor);
	else
		/* Now to convert all those numbers into names.. */
		twitter_get_users_lookup(ic);

	txl->list = NULL;
	txl_free(txl);
}

static xt_status twitter_xt_get_users(struct xt_node *node, struct twitter_xml_list *txl);
static void twitter_http_get_users_lookup(struct http_request *req);

static void twitter_get_users_lookup(struct im_connection *ic)
{
	struct twitter_data *td = ic->proto_data;
	char *args[2] = {
		"user_id",
		NULL,
	};
	GString *ids = g_string_new("");
	int i;
	
	/* We can request up to 100 users at a time. */
	for (i = 0; i < 100 && td->follow_ids; i ++) {
		g_string_append_printf(ids, ",%s", (char*) td->follow_ids->data);
		g_free(td->follow_ids->data);
		td->follow_ids = g_slist_remove(td->follow_ids, td->follow_ids->data);
	}
	if (ids->len > 0) {
		args[1] = ids->str + 1;
		/* POST, because I think ids can be up to 1KB long. */
		twitter_http(ic, TWITTER_USERS_LOOKUP_URL, twitter_http_get_users_lookup, ic, 1, args, 2);
	} else {
		/* We have all users. Continue with login. (Get statuses.) */
		td->flags |= TWITTER_HAVE_FRIENDS;
		twitter_login_finish(ic);
	}
	g_string_free(ids, TRUE);
}

/**
 * Callback for getting (twitter)friends...
 *
 * Be afraid, be very afraid! This function will potentially add hundreds of "friends". "Who has 
 * hundreds of friends?" you wonder? You probably not, since you are reading the source of 
 * BitlBee... Get a life and meet new people!
 */
static void twitter_http_get_users_lookup(struct http_request *req)
{
	struct im_connection *ic = req->data;
	struct twitter_data *td;
	struct xt_parser *parser;
	struct twitter_xml_list *txl;
	GSList *l = NULL;
	struct twitter_xml_user *user;

	// Check if the connection is still active.
	if (!g_slist_find(twitter_connections, ic))
		return;

	td = ic->proto_data;

	if (req->status_code != 200) {
		// It didn't go well, output the error and return.
		imcb_error(ic, "Could not retrieve %s: %s",
			   TWITTER_USERS_LOOKUP_URL, twitter_parse_error(req));
		imc_logout(ic, TRUE);
		return;
	} else {
		td->http_fails = 0;
	}

	txl = g_new0(struct twitter_xml_list, 1);
	txl->list = NULL;

	// Parse the data.
	parser = xt_new(NULL, txl);
	xt_feed(parser, req->reply_body, req->body_size);

	// Get the user list from the parsed xml feed.
	twitter_xt_get_users(parser->root, txl);
	xt_free(parser);

	// Add the users as buddies.
	for (l = txl->list; l; l = g_slist_next(l)) {
		user = l->data;
		twitter_add_buddy(ic, user->screen_name, user->name);
	}

	// Free the structure.
	txl_free(txl);

	twitter_get_users_lookup(ic);
}

/**
 * Function to fill a twitter_xml_user struct.
 * It sets:
 *  - the name and
 *  - the screen_name.
 */
static xt_status twitter_xt_get_user(struct xt_node *node, struct twitter_xml_user *txu)
{
	struct xt_node *child;

	// Walk over the nodes children.
	for (child = node->children; child; child = child->next) {
		if (g_strcasecmp("name", child->name) == 0) {
			txu->name = g_memdup(child->text, child->text_len + 1);
		} else if (g_strcasecmp("screen_name", child->name) == 0) {
			txu->screen_name = g_memdup(child->text, child->text_len + 1);
		}
	}
	return XT_HANDLED;
}

/**
 * Function to fill a twitter_xml_list struct.
 * It sets:
 *  - all <user>s from the <users> element.
 */
static xt_status twitter_xt_get_users(struct xt_node *node, struct twitter_xml_list *txl)
{
	struct twitter_xml_user *txu;
	struct xt_node *child;

	// Set the type of the list.
	txl->type = TXL_USER;

	// The root <users> node should hold the list of users <user>
	// Walk over the nodes children.
	for (child = node->children; child; child = child->next) {
		if (g_strcasecmp("user", child->name) == 0) {
			txu = g_new0(struct twitter_xml_user, 1);
			twitter_xt_get_user(child, txu);
			// Put the item in the front of the list.
			txl->list = g_slist_prepend(txl->list, txu);
		}
	}

	return XT_HANDLED;
}

#ifdef __GLIBC__
#define TWITTER_TIME_FORMAT "%a %b %d %H:%M:%S %z %Y"
#else
#define TWITTER_TIME_FORMAT "%a %b %d %H:%M:%S +0000 %Y"
#endif

/**
 * Function to fill a twitter_xml_status struct.
 * It sets:
 *  - the status text and
 *  - the created_at timestamp and
 *  - the status id and
 *  - the user in a twitter_xml_user struct.
 */
static xt_status twitter_xt_get_status(struct xt_node *node, struct twitter_xml_status *txs)
{
	struct xt_node *child, *rt = NULL;

	// Walk over the nodes children.
	for (child = node->children; child; child = child->next) {
		if (g_strcasecmp("text", child->name) == 0) {
			txs->text = g_memdup(child->text, child->text_len + 1);
		} else if (g_strcasecmp("retweeted_status", child->name) == 0) {
			rt = child;
		} else if (g_strcasecmp("created_at", child->name) == 0) {
			struct tm parsed;

			/* Very sensitive to changes to the formatting of
			   this field. :-( Also assumes the timezone used
			   is UTC since C time handling functions suck. */
			if (strptime(child->text, TWITTER_TIME_FORMAT, &parsed) != NULL)
				txs->created_at = mktime_utc(&parsed);
		} else if (g_strcasecmp("user", child->name) == 0) {
			txs->user = g_new0(struct twitter_xml_user, 1);
			twitter_xt_get_user(child, txs->user);
		} else if (g_strcasecmp("id", child->name) == 0) {
			txs->id = g_ascii_strtoull(child->text, NULL, 10);
		} else if (g_strcasecmp("in_reply_to_status_id", child->name) == 0) {
			txs->reply_to = g_ascii_strtoull(child->text, NULL, 10);
		}
	}

	/* If it's a (truncated) retweet, get the original. Even if the API claims it
	   wasn't truncated because it may be lying. */
	if (rt) {
		struct twitter_xml_status *rtxs = g_new0(struct twitter_xml_status, 1);
		if (twitter_xt_get_status(rt, rtxs) != XT_HANDLED) {
			txs_free(rtxs);
			return XT_HANDLED;
		}

		g_free(txs->text);
		txs->text = g_strdup_printf("RT @%s: %s", rtxs->user->screen_name, rtxs->text);
		txs_free(rtxs);
	} else {
		struct xt_node *urls, *url;
		
		urls = xt_find_path(node, "entities/urls");
		for (url = urls ? urls->children : NULL; url; url = url->next) {
			/* "short" is a reserved word. :-P */
			struct xt_node *kort = xt_find_node(url->children, "url");
			struct xt_node *disp = xt_find_node(url->children, "display_url");
			char *pos, *new;
			
			if (!kort || !kort->text || !disp || !disp->text ||
			    !(pos = strstr(txs->text, kort->text)))
				continue;
			
			*pos = '\0';
			new = g_strdup_printf("%s%s &lt;%s&gt;%s", txs->text, kort->text,
			                      disp->text, pos + strlen(kort->text));
			
			g_free(txs->text);
			txs->text = new;
		}
	}

	return XT_HANDLED;
}

/**
 * Function to fill a twitter_xml_list struct.
 * It sets:
 *  - all <status>es within the <status> element and
 *  - the next_cursor.
 */
static xt_status twitter_xt_get_status_list(struct im_connection *ic, struct xt_node *node,
					    struct twitter_xml_list *txl)
{
	struct twitter_xml_status *txs;
	struct xt_node *child;
	bee_user_t *bu;

	// Set the type of the list.
	txl->type = TXL_STATUS;

	// The root <statuses> node should hold the list of statuses <status>
	// Walk over the nodes children.
	for (child = node->children; child; child = child->next) {
		if (g_strcasecmp("status", child->name) == 0) {
			txs = g_new0(struct twitter_xml_status, 1);
			twitter_xt_get_status(child, txs);
			// Put the item in the front of the list.
			txl->list = g_slist_prepend(txl->list, txs);

			if (txs->user && txs->user->screen_name &&
			    (bu = bee_user_by_handle(ic->bee, ic, txs->user->screen_name))) {
				struct twitter_user_data *tud = bu->data;

				if (txs->id > tud->last_id) {
					tud->last_id = txs->id;
					tud->last_time = txs->created_at;
				}
			}
		} else if (g_strcasecmp("next_cursor", child->name) == 0) {
			twitter_xt_next_cursor(child, txl);
		}
	}

	return XT_HANDLED;
}

static char *twitter_msg_add_id(struct im_connection *ic,
				struct twitter_xml_status *txs, const char *prefix)
{
	struct twitter_data *td = ic->proto_data;
	char *ret = NULL;

	if (!set_getbool(&ic->acc->set, "show_ids")) {
		if (*prefix)
			return g_strconcat(prefix, txs->text, NULL);
		else
			return NULL;
	}

	td->log[td->log_id].id = txs->id;
	td->log[td->log_id].bu = bee_user_by_handle(ic->bee, ic, txs->user->screen_name);
	if (txs->reply_to) {
		int i;
		for (i = 0; i < TWITTER_LOG_LENGTH; i++)
			if (td->log[i].id == txs->reply_to) {
				ret = g_strdup_printf("\002[\002%02d->%02d\002]\002 %s%s",
						      td->log_id, i, prefix, txs->text);
				break;
			}
	}
	if (ret == NULL)
		ret = g_strdup_printf("\002[\002%02d\002]\002 %s%s", td->log_id, prefix, txs->text);
	td->log_id = (td->log_id + 1) % TWITTER_LOG_LENGTH;

	return ret;
}

static void twitter_groupchat_init(struct im_connection *ic)
{
	char *name_hint;
	struct groupchat *gc;
	struct twitter_data *td = ic->proto_data;
	GSList *l;

	td->timeline_gc = gc = imcb_chat_new(ic, "twitter/timeline");

	name_hint = g_strdup_printf("%s_%s", td->prefix, ic->acc->user);
	imcb_chat_name_hint(gc, name_hint);
	g_free(name_hint);

	for (l = ic->bee->users; l; l = l->next) {
		bee_user_t *bu = l->data;
		if (bu->ic == ic)
			imcb_chat_add_buddy(td->timeline_gc, bu->handle);
	}
}

/**
 * Function that is called to see the statuses in a groupchat window.
 */
static void twitter_groupchat(struct im_connection *ic, GSList * list)
{
	struct twitter_data *td = ic->proto_data;
	GSList *l = NULL;
	struct twitter_xml_status *status;
	struct groupchat *gc;
	guint64 last_id = 0;

	// Create a new groupchat if it does not exsist.
	if (!td->timeline_gc)
		twitter_groupchat_init(ic);

	gc = td->timeline_gc;
	if (!gc->joined)
		imcb_chat_add_buddy(gc, ic->acc->user);

	for (l = list; l; l = g_slist_next(l)) {
		char *msg;

		status = l->data;
		if (status->user == NULL || status->text == NULL || last_id == status->id)
			continue;

		last_id = status->id;

		strip_html(status->text);

		msg = twitter_msg_add_id(ic, status, "");

		// Say it!
		if (g_strcasecmp(td->user, status->user->screen_name) == 0) {
			imcb_chat_log(gc, "You: %s", msg ? msg : status->text);
		} else {
			twitter_add_buddy(ic, status->user->screen_name, status->user->name);

			imcb_chat_msg(gc, status->user->screen_name,
				      msg ? msg : status->text, 0, status->created_at);
		}

		g_free(msg);

		// Update the timeline_id to hold the highest id, so that by the next request
		// we won't pick up the updates already in the list.
		td->timeline_id = MAX(td->timeline_id, status->id);
	}
}

/**
 * Function that is called to see statuses as private messages.
 */
static void twitter_private_message_chat(struct im_connection *ic, GSList * list)
{
	struct twitter_data *td = ic->proto_data;
	GSList *l = NULL;
	struct twitter_xml_status *status;
	char from[MAX_STRING];
	gboolean mode_one;
	guint64 last_id = 0;

	mode_one = g_strcasecmp(set_getstr(&ic->acc->set, "mode"), "one") == 0;

	if (mode_one) {
		g_snprintf(from, sizeof(from) - 1, "%s_%s", td->prefix, ic->acc->user);
		from[MAX_STRING - 1] = '\0';
	}

	for (l = list; l; l = g_slist_next(l)) {
		char *prefix = NULL, *text = NULL;

		status = l->data;
		if (status->user == NULL || status->text == NULL || last_id == status->id)
			continue;

		last_id = status->id;

		strip_html(status->text);
		if (mode_one)
			prefix = g_strdup_printf("\002<\002%s\002>\002 ",
						 status->user->screen_name);
		else
			twitter_add_buddy(ic, status->user->screen_name, status->user->name);

		text = twitter_msg_add_id(ic, status, prefix ? prefix : "");

		imcb_buddy_msg(ic,
			       mode_one ? from : status->user->screen_name,
			       text ? text : status->text, 0, status->created_at);

		// Update the timeline_id to hold the highest id, so that by the next request
		// we won't pick up the updates already in the list.
		td->timeline_id = MAX(td->timeline_id, status->id);

		g_free(text);
		g_free(prefix);
	}
}

static void twitter_http_get_home_timeline(struct http_request *req);
static void twitter_http_get_mentions(struct http_request *req);

/**
 * Get the timeline with optionally mentions
 */
void twitter_get_timeline(struct im_connection *ic, gint64 next_cursor)
{
	struct twitter_data *td = ic->proto_data;
	gboolean include_mentions = set_getbool(&ic->acc->set, "fetch_mentions");

	if (td->flags & TWITTER_DOING_TIMELINE) {
		return;
	}

	td->flags |= TWITTER_DOING_TIMELINE;

	twitter_get_home_timeline(ic, next_cursor);

	if (include_mentions) {
		twitter_get_mentions(ic, next_cursor);
	}
}

/**
 * Call this one after receiving timeline/mentions. Show to user once we have
 * both.
 */
void twitter_flush_timeline(struct im_connection *ic)
{
	struct twitter_data *td = ic->proto_data;
	gboolean include_mentions = set_getbool(&ic->acc->set, "fetch_mentions");
	gboolean show_old_mentions = set_getbool(&ic->acc->set, "show_old_mentions");
	struct twitter_xml_list *home_timeline = td->home_timeline_obj;
	struct twitter_xml_list *mentions = td->mentions_obj;
	GSList *output = NULL;
	GSList *l;

	if (!(td->flags & TWITTER_GOT_TIMELINE)) {
		return;
	}

	if (include_mentions && !(td->flags & TWITTER_GOT_MENTIONS)) {
		return;
	}

	if (home_timeline && home_timeline->list) {
		for (l = home_timeline->list; l; l = g_slist_next(l)) {
			output = g_slist_insert_sorted(output, l->data, twitter_compare_elements);
		}
	}

	if (include_mentions && mentions && mentions->list) {
		for (l = mentions->list; l; l = g_slist_next(l)) {
			if (!show_old_mentions && output && twitter_compare_elements(l->data, output->data) < 0) {
				continue;
			}

			output = g_slist_insert_sorted(output, l->data, twitter_compare_elements);
		}
	}

	// See if the user wants to see the messages in a groupchat window or as private messages.
	if (g_strcasecmp(set_getstr(&ic->acc->set, "mode"), "chat") == 0)
		twitter_groupchat(ic, output);
	else
		twitter_private_message_chat(ic, output);

	g_slist_free(output);

	txl_free(home_timeline);
	txl_free(mentions);

	td->flags &= ~(TWITTER_DOING_TIMELINE | TWITTER_GOT_TIMELINE | TWITTER_GOT_MENTIONS);
	td->home_timeline_obj = td->mentions_obj = NULL;
}

/**
 * Get the timeline.
 */
void twitter_get_home_timeline(struct im_connection *ic, gint64 next_cursor)
{
	struct twitter_data *td = ic->proto_data;

	txl_free(td->home_timeline_obj);
	td->home_timeline_obj = NULL;
	td->flags &= ~TWITTER_GOT_TIMELINE;

	char *args[6];
	args[0] = "cursor";
	args[1] = g_strdup_printf("%lld", (long long) next_cursor);
	args[2] = "include_entities";
	args[3] = "true";
	if (td->timeline_id) {
		args[4] = "since_id";
		args[5] = g_strdup_printf("%llu", (long long unsigned int) td->timeline_id);
	}

	if (twitter_http(ic, TWITTER_HOME_TIMELINE_URL, twitter_http_get_home_timeline, ic, 0, args,
		     td->timeline_id ? 6 : 4) == NULL) {
		if (++td->http_fails >= 5)
			imcb_error(ic, "Could not retrieve %s: %s",
			           TWITTER_HOME_TIMELINE_URL, "connection failed");
		td->flags |= TWITTER_GOT_TIMELINE;
		twitter_flush_timeline(ic);
	}

	g_free(args[1]);
	if (td->timeline_id) {
		g_free(args[5]);
	}
}

/**
 * Get mentions.
 */
void twitter_get_mentions(struct im_connection *ic, gint64 next_cursor)
{
	struct twitter_data *td = ic->proto_data;

	txl_free(td->mentions_obj);
	td->mentions_obj = NULL;
	td->flags &= ~TWITTER_GOT_MENTIONS;

	char *args[6];
	args[0] = "cursor";
	args[1] = g_strdup_printf("%lld", (long long) next_cursor);
	args[2] = "include_entities";
	args[3] = "true";
	if (td->timeline_id) {
		args[4] = "since_id";
		args[5] = g_strdup_printf("%llu", (long long unsigned int) td->timeline_id);
	}

	if (twitter_http(ic, TWITTER_MENTIONS_URL, twitter_http_get_mentions, ic, 0, args,
		     td->timeline_id ? 6 : 4) == NULL) {
		if (++td->http_fails >= 5)
			imcb_error(ic, "Could not retrieve %s: %s",
			           TWITTER_MENTIONS_URL, "connection failed");
		td->flags |= TWITTER_GOT_MENTIONS;
		twitter_flush_timeline(ic);
	}

	g_free(args[1]);
	if (td->timeline_id) {
		g_free(args[5]);
	}
}

/**
 * Callback for getting the home timeline.
 */
static void twitter_http_get_home_timeline(struct http_request *req)
{
	struct im_connection *ic = req->data;
	struct twitter_data *td;
	struct xt_parser *parser;
	struct twitter_xml_list *txl;

	// Check if the connection is still active.
	if (!g_slist_find(twitter_connections, ic))
		return;

	td = ic->proto_data;

	// Check if the HTTP request went well.
	if (req->status_code == 200) {
		td->http_fails = 0;
		if (!(ic->flags & OPT_LOGGED_IN))
			imcb_connected(ic);
	} else if (req->status_code == 401) {
		imcb_error(ic, "Authentication failure");
		imc_logout(ic, FALSE);
		goto end;
	} else {
		// It didn't go well, output the error and return.
		if (++td->http_fails >= 5)
			imcb_error(ic, "Could not retrieve %s: %s",
				   TWITTER_HOME_TIMELINE_URL, twitter_parse_error(req));

		goto end;
	}

	txl = g_new0(struct twitter_xml_list, 1);
	txl->list = NULL;

	// Parse the data.
	parser = xt_new(NULL, txl);
	xt_feed(parser, req->reply_body, req->body_size);
	// The root <statuses> node should hold the list of statuses <status>
	twitter_xt_get_status_list(ic, parser->root, txl);
	xt_free(parser);

	td->home_timeline_obj = txl;

      end:
	td->flags |= TWITTER_GOT_TIMELINE;

	twitter_flush_timeline(ic);
}

/**
 * Callback for getting mentions.
 */
static void twitter_http_get_mentions(struct http_request *req)
{
	struct im_connection *ic = req->data;
	struct twitter_data *td;
	struct xt_parser *parser;
	struct twitter_xml_list *txl;

	// Check if the connection is still active.
	if (!g_slist_find(twitter_connections, ic))
		return;

	td = ic->proto_data;

	// Check if the HTTP request went well.
	if (req->status_code == 200) {
		td->http_fails = 0;
		if (!(ic->flags & OPT_LOGGED_IN))
			imcb_connected(ic);
	} else if (req->status_code == 401) {
		imcb_error(ic, "Authentication failure");
		imc_logout(ic, FALSE);
		goto end;
	} else {
		// It didn't go well, output the error and return.
		if (++td->http_fails >= 5)
			imcb_error(ic, "Could not retrieve %s: %s",
				   TWITTER_MENTIONS_URL, twitter_parse_error(req));

		goto end;
	}

	txl = g_new0(struct twitter_xml_list, 1);
	txl->list = NULL;

	// Parse the data.
	parser = xt_new(NULL, txl);
	xt_feed(parser, req->reply_body, req->body_size);
	// The root <statuses> node should hold the list of statuses <status>
	twitter_xt_get_status_list(ic, parser->root, txl);
	xt_free(parser);

	td->mentions_obj = txl;

      end:
	td->flags |= TWITTER_GOT_MENTIONS;

	twitter_flush_timeline(ic);
}

/**
 * Callback to use after sending a POST request to twitter.
 * (Generic, used for a few kinds of queries.)
 */
static void twitter_http_post(struct http_request *req)
{
	struct im_connection *ic = req->data;
	struct twitter_data *td;

	// Check if the connection is still active.
	if (!g_slist_find(twitter_connections, ic))
		return;

	td = ic->proto_data;
	td->last_status_id = 0;

	// Check if the HTTP request went well.
	if (req->status_code != 200) {
		// It didn't go well, output the error and return.
		imcb_error(ic, "HTTP error: %s", twitter_parse_error(req));
		return;
	}

	if (req->body_size > 0) {
		struct xt_parser *xp = NULL;
		struct xt_node *node;

		xp = xt_new(NULL, NULL);
		xt_feed(xp, req->reply_body, req->body_size);

		if ((node = xt_find_node(xp->root, "status")) &&
		    (node = xt_find_node(node->children, "id")) && node->text)
			td->last_status_id = g_ascii_strtoull(node->text, NULL, 10);

		xt_free(xp);
	}
}

/**
 * Function to POST a new status to twitter.
 */
void twitter_post_status(struct im_connection *ic, char *msg, guint64 in_reply_to)
{
	char *args[4] = {
		"status", msg,
		"in_reply_to_status_id",
		g_strdup_printf("%llu", (unsigned long long) in_reply_to)
	};
	twitter_http(ic, TWITTER_STATUS_UPDATE_URL, twitter_http_post, ic, 1,
		     args, in_reply_to ? 4 : 2);
	g_free(args[3]);
}


/**
 * Function to POST a new message to twitter.
 */
void twitter_direct_messages_new(struct im_connection *ic, char *who, char *msg)
{
	char *args[4];
	args[0] = "screen_name";
	args[1] = who;
	args[2] = "text";
	args[3] = msg;
	// Use the same callback as for twitter_post_status, since it does basically the same.
	twitter_http(ic, TWITTER_DIRECT_MESSAGES_NEW_URL, twitter_http_post, ic, 1, args, 4);
}

void twitter_friendships_create_destroy(struct im_connection *ic, char *who, int create)
{
	char *args[2];
	args[0] = "screen_name";
	args[1] = who;
	twitter_http(ic, create ? TWITTER_FRIENDSHIPS_CREATE_URL : TWITTER_FRIENDSHIPS_DESTROY_URL,
		     twitter_http_post, ic, 1, args, 2);
}

void twitter_status_destroy(struct im_connection *ic, guint64 id)
{
	char *url;
	url = g_strdup_printf("%s%llu%s", TWITTER_STATUS_DESTROY_URL,
	                      (unsigned long long) id, ".xml");
	twitter_http(ic, url, twitter_http_post, ic, 1, NULL, 0);
	g_free(url);
}

void twitter_status_retweet(struct im_connection *ic, guint64 id)
{
	char *url;
	url = g_strdup_printf("%s%llu%s", TWITTER_STATUS_RETWEET_URL,
	                      (unsigned long long) id, ".xml");
	twitter_http(ic, url, twitter_http_post, ic, 1, NULL, 0);
	g_free(url);
}