/**

 * GMyth Library

 *

 * @file gmyth/gmyth_tvchain.c

 * 

 * @brief <p> This component contains functions for creating and accessing

 * the tvchain functions for live tv playback.

 * 

 * Copyright (C) 2006 INdT - Instituto Nokia de Tecnologia.

 * @author Hallyson Luiz de Morais Melo <hallyson.melo@indt.org.br>

 *

 *//*

 * 

 * 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) 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 Lesser 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

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "gmyth_tvchain.h"

#include <glib.h>

#include <time.h>

#include <stdio.h>

#include <stdlib.h>

#include <assert.h>

#include "gmyth_epg.h"

#include "gmyth_util.h"

#include "gmyth_query.h"

#include "gmyth_scheduler.h"

#include "gmyth_debug.h"

static void gmyth_tvchain_class_init          (GMythTVChainClass *klass);

static void gmyth_tvchain_init                (GMythTVChain *object);

static void gmyth_tvchain_dispose  (GObject *object);

static void gmyth_tvchain_finalize (GObject *object);

G_DEFINE_TYPE(GMythTVChain, gmyth_tvchain, G_TYPE_OBJECT)

static GStaticMutex mutex = G_STATIC_MUTEX_INIT;

static void

gmyth_tvchain_class_init (GMythTVChainClass *klass)

{

	GObjectClass *gobject_class;

	gobject_class = (GObjectClass *) klass;

	gobject_class->dispose  = gmyth_tvchain_dispose;

	gobject_class->finalize = gmyth_tvchain_finalize;	

}

static void

gmyth_tvchain_init (GMythTVChain *tvchain)

{

	tvchain->tvchain_id = NULL;

	tvchain->cur_chanid = g_string_new ("");

	tvchain->cur_startts = 0;

}

static void

gmyth_tvchain_dispose  (GObject *object)

{

    GMythTVChain *tvchain = GMYTH_TVCHAIN(object);

    if ( tvchain->tvchain_id != NULL ) {

	g_string_free( tvchain->tvchain_id, TRUE );

	tvchain->tvchain_id = NULL;

    }

    if ( tvchain->tvchain_list != NULL ) {

	g_list_free( tvchain->tvchain_list );

	tvchain->tvchain_list = NULL;

    }

    if ( tvchain->cur_chanid != NULL ) {

	g_string_free( tvchain->cur_chanid, TRUE );

	tvchain->cur_chanid = NULL;

    }

    if ( tvchain->backend_info) {

        g_object_unref (tvchain->backend_info);

        tvchain->backend_info = NULL;

    }

    G_OBJECT_CLASS (gmyth_tvchain_parent_class)->dispose (object);

}

static void

gmyth_tvchain_finalize (GObject *object)

{

    g_signal_handlers_destroy (object);

    G_OBJECT_CLASS (gmyth_tvchain_parent_class)->finalize (object);

}

/** Initializes the tvchain and generates the tvchain id.

 * 

 * @param tvchain The GMythTVChain instance.

 * @param hostname The local hostname used to generate the tvchain id.

 */

gboolean

gmyth_tvchain_initialize (GMythTVChain *tvchain, GMythBackendInfo *backend_info)

{

    const char *hostname;

    assert (tvchain);

    g_return_val_if_fail (backend_info != NULL, FALSE);

    g_object_ref (backend_info);

    tvchain->backend_info = backend_info;

    hostname = gmyth_backend_info_get_hostname (backend_info);

    if (tvchain->tvchain_id == NULL) {

	    GString *isodate;

    	time_t cur_time;

	    time(&cur_time);

    	isodate = gmyth_util_time_to_isoformat (cur_time);

	    tvchain->tvchain_id = g_string_sized_new (7 + strlen (hostname) + isodate->len);

    	g_string_printf(tvchain->tvchain_id, 

	    	"live-%s-%s", hostname, isodate->str);

    	gmyth_debug ("[%s] tv_chain_id: %s", __FUNCTION__, tvchain->tvchain_id->str);

	    g_string_free(isodate, TRUE);

    } else {

    	g_warning ("[%s] TVchain already initialized", __FUNCTION__);

    }

    return TRUE;

}

/** Gets the tvchain id.

 * 

 * @param tvchain The GMythTVChain instance.

 * @return The tvchain id.

 */

GString*

gmyth_tvchain_get_id (GMythTVChain *tvchain)

{

	g_return_val_if_fail( tvchain != NULL && tvchain->tvchain_id != NULL, NULL );

	return g_string_new (tvchain->tvchain_id->str);

}

/** Reloads all tvchain entries in the database.

 * 

 * @param tvchain The GMythTVChain instance.

 * @return  TRUE if success, or FALSE if error.

 */

gboolean

gmyth_tvchain_reload_all (GMythTVChain *tvchain)

{

	MYSQL_ROW msql_row;

	MYSQL_RES *msql_res = NULL;

	GMythQuery *gmyth_query = NULL;

	gboolean ret = TRUE;

	GString *stmt_str = NULL;

	g_static_mutex_lock( &mutex );

	/* gets the initial size of the TVChain entries list */

	guint prev_size = g_list_length (tvchain->tvchain_list);

	gmyth_debug ("[%s] chainid: %s", __FUNCTION__, tvchain->tvchain_id->str);

	if ( tvchain != NULL && tvchain->tvchain_list != NULL ) {

		g_list_free (tvchain->tvchain_list);

		tvchain->tvchain_list = NULL;

	}

	// TODO: Reuse gmyth_query already connected from context

	gmyth_query = gmyth_query_new ();

	if (!gmyth_query_connect (gmyth_query, tvchain->backend_info)) {

		g_warning ("[%s] Could not connect to db", __FUNCTION__);

		g_static_mutex_unlock( &mutex );

		ret = FALSE;

		goto done;

	}

	stmt_str = g_string_new ("");

	g_string_printf (stmt_str, 

			"SELECT chanid, starttime, endtime, discontinuity, "

			"chainpos, hostprefix, cardtype, channame, input "

			"FROM tvchain "

			"WHERE chainid = \"%s\" ORDER BY chainpos;",

			tvchain->tvchain_id->str);

	msql_res = gmyth_query_process_statement(gmyth_query, stmt_str->str);

	if (msql_res != NULL) {

		while ((msql_row = mysql_fetch_row (msql_res)) != NULL) {

			struct LiveTVChainEntry *entry = g_new0 (struct LiveTVChainEntry, 1);

			entry->chanid = g_string_new (msql_row[0]);

			entry->starttime = gmyth_util_string_to_time (g_string_new ((gchar*)msql_row[1]));

			entry->endtime = gmyth_util_string_to_time (g_string_new (msql_row[2]));

			entry->discontinuity = atoi (msql_row[3]) != 0;

			entry->hostprefix = g_string_new (msql_row[5]);

			entry->cardtype = g_string_new (msql_row[6]);

			entry->channum = g_string_new (msql_row[7]);

			entry->inputname = g_string_new (msql_row[8]);

			//m_maxpos = query.value(4).toInt() + 1;

			g_print( "[%s] Reading TV chain entry: [%s, %s, %s]\n", __FUNCTION__, entry->chanid->str, 

					(gchar*)msql_row[1], (gchar*)msql_row[2] );

			/* add this to get the actual start timestamp of the last recording */

			if ( tvchain->cur_startts < entry->starttime )

				tvchain->cur_startts = entry->starttime;

			tvchain->tvchain_list = g_list_append (tvchain->tvchain_list, entry);			

		}

	} else {

		g_warning ("gmyth_tvchain_reload_all query error!\n");

		g_static_mutex_unlock( &mutex );

		ret = FALSE;

		goto done;

	}

	g_static_mutex_unlock( &mutex );

	tvchain->cur_pos = gmyth_tvchain_program_is_at (tvchain, tvchain->cur_chanid, tvchain->cur_startts);

	g_print( "[%s] TVChain current position = %d.\n", __FUNCTION__, tvchain->cur_pos );

	if (tvchain->cur_pos < 0)

		tvchain->cur_pos = 0;

	//    if (m_switchid >= 0)

	//        m_switchid = ProgramIsAt(m_switchentry.chanid,m_switchentry.starttime);

	if (prev_size != g_list_length (tvchain->tvchain_list)) {

		gmyth_debug ("[%s] Added new recording", __FUNCTION__);

	}	

done:

	if ( stmt_str != NULL )

		g_string_free (stmt_str, TRUE);

	if ( msql_res != NULL )

		mysql_free_result (msql_res);

	if ( gmyth_query != NULL )

		g_object_unref (gmyth_query);

	return ret;

}

/** Returns the internal index for the TV chain related to the given

 * channel and start time.

 * 

 * @param tvchain The GMythTVChain instance.

 * @param chanid The channel id.

 * @param startts The program start time.

 */

int

gmyth_tvchain_program_is_at (GMythTVChain *tvchain, GString *chanid, time_t startts)

{

	int count = 0;

	struct LiveTVChainEntry *entry;

	GList *tmp_list = tvchain->tvchain_list;

	guint list_size = g_list_length (tvchain->tvchain_list);

	g_static_mutex_lock( &mutex );

	for (; tmp_list && ( count < list_size ); tmp_list = tvchain->tvchain_list->next, count++)

	{

		entry = (struct LiveTVChainEntry*) tmp_list->data;

		if (!g_strncasecmp (entry->chanid->str, chanid->str, chanid->len)

				&& entry->starttime == startts)

		{

			g_static_mutex_unlock( &mutex );

			return count;

		}

	}

	g_static_mutex_unlock( &mutex );

	return -1;	

}

/** Get the program info associated to the tvchain.

 * 

 * @param tvchain The GMythTVChain instance.

 * @param index The tvchain index.

 * @return The program info structure.

 */

GMythProgramInfo*

gmyth_tvchain_get_program_at (GMythTVChain *tvchain, int index)

{

	struct LiveTVChainEntry *entry;

	entry = gmyth_tvchain_get_entry_at (tvchain, index);

	if (entry)

		return gmyth_tvchain_entry_to_program (tvchain, entry);	

	return NULL;

}

/** Gets a LiveTVChainEntry associated to the tvchain by its index.

 * 

 * @param tvchain The GMythTVChain instance.

 * @param index The tvchain entry index

 * @return The LiveTVchainEntry structure.

 */

struct LiveTVChainEntry*

gmyth_tvchain_get_entry_at (GMythTVChain *tvchain, int index)

{

	struct LiveTVChainEntry* chain_entry = NULL;

	g_return_val_if_fail( tvchain != NULL && tvchain->tvchain_list != NULL, NULL );

	g_static_mutex_lock( &mutex );

	int size = g_list_length (tvchain->tvchain_list);

	int new_index = (index < 0 || index >= size) ? size - 1 : index;

	if (new_index >= 0) 

		chain_entry = (struct LiveTVChainEntry*) g_list_nth_data (tvchain->tvchain_list, new_index);

	g_static_mutex_unlock( &mutex );

	if ( chain_entry != NULL ) {

		gmyth_debug ("[%s] Got TV Chain entry at %d.\n", __FUNCTION__, new_index );

	} else {

		g_warning ("[%s] failed to get entry at index %d", __FUNCTION__, index);

	}

	return chain_entry;

}

/** Gets the program info from backend database associated to the tv chain entry.

 * 

 * @param tvchain The GMythTVChain instance.

 * @param entry the LiveTVChainEntry to be converted.

 * @return The progrma info.

 */

GMythProgramInfo*

gmyth_tvchain_entry_to_program (GMythTVChain *tvchain, struct LiveTVChainEntry *entry)

{

	GMythProgramInfo *proginfo = NULL;

	g_return_val_if_fail( tvchain != NULL, NULL );

	if (!entry || !tvchain) {

		g_warning ("gmyth_tvchain_entry_to_program() received NULL argument");

		return NULL;

	}

	GMythScheduler *scheduler = gmyth_scheduler_new ();

	gmyth_scheduler_connect( scheduler, tvchain->backend_info );

	proginfo = gmyth_scheduler_get_recorded (scheduler, 

			entry->chanid, entry->starttime);

	gmyth_scheduler_disconnect( scheduler );

	if (proginfo) {

		proginfo->pathname = g_string_prepend (proginfo->pathname, entry->hostprefix->str);

	} else {

		g_warning ("tvchain_entry_to_program(%s, %ld) failed!", entry->chanid->str, entry->starttime);

	}

	return proginfo;

}