/**

 * GMyth Library

 *

 * @file gmyth/gmyth_epg.c

 * 

 * @brief <p> GMythEPG class provides access to the program and channel data

 * from the Electronic Program Guide (EPG) of the Mythtv backend.

 *

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

 * @author Leonardo Sobral Cunha <leonardo.cunha@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 <mysql/mysql.h>

#include <stdlib.h>

#include <string.h>

#include <assert.h>

#include "gmyth_epg.h"

#include "gmyth_programinfo.h"

#include "gmyth_util.h"

#include "gmyth_debug.h"

static void gmyth_epg_class_init          (GMythEPGClass *klass);

static void gmyth_epg_init                (GMythEPG *object);

static void gmyth_epg_dispose  (GObject *object);

static void gmyth_epg_finalize (GObject *object);

G_DEFINE_TYPE(GMythEPG, gmyth_epg, G_TYPE_OBJECT)

static void

gmyth_epg_class_init (GMythEPGClass *klass)

{

	GObjectClass *gobject_class = G_OBJECT_CLASS (klass);

    gobject_class->dispose  = gmyth_epg_dispose;

    gobject_class->finalize = gmyth_epg_finalize;	

}

static void

gmyth_epg_init (GMythEPG *gmyth_epg)

{

}

static void

gmyth_epg_dispose  (GObject *object)

{

    //GMythEPG *gmyth_epg = GMYTH_EPG(object);

	G_OBJECT_CLASS (gmyth_epg_parent_class)->dispose (object);

}

static void

gmyth_epg_finalize (GObject *object)

{

    g_signal_handlers_destroy (object);

    G_OBJECT_CLASS (gmyth_epg_parent_class)->finalize (object);

}

/**

 * Creates a new instance of GMythEPG.

 * 

 * @return a new instance of GMythEPG.

 */

GMythEPG*

gmyth_epg_new (void)

{

    GMythEPG *epg = GMYTH_EPG (g_object_new(GMYTH_EPG_TYPE, NULL));

    return epg;

}

/** Connects to the Mysql database in the backend. The backend address

 * is loaded from the GMythSettings instance.

 * 

 * @param gmyth_epg the GMythEPG instance to be connected.

 * @return true if connection was success, false if failed.

 */

gboolean

gmyth_epg_connect (GMythEPG *gmyth_epg, GMythBackendInfo *backend_info)

{

    assert(gmyth_epg);

    if (gmyth_epg->sqlquery	== NULL) {

	gmyth_debug ("[%s] Creating gmyth_query", __FUNCTION__);

        gmyth_epg->sqlquery = gmyth_query_new ( );

    }

    if (!gmyth_query_connect(gmyth_epg->sqlquery, backend_info)) {

        g_warning ("[%s] Error while connecting to db", __FUNCTION__);

        return FALSE;

    }

    return TRUE;	

}

/** Disconnects from the Mysql database in the backend.

 * 

 * @param gmyth_epg the GMythEPG instance to be disconnected

 * @return true if disconnection was success, false if failed.

 */

gboolean

gmyth_epg_disconnect (GMythEPG *gmyth_epg)

{

	assert(gmyth_epg);

	if (gmyth_epg->sqlquery	!= NULL) {	

		g_object_unref (gmyth_epg->sqlquery);

        gmyth_epg->sqlquery = NULL;

	}

	return TRUE;

}

/** Retrieves the available list of channels from the backend Mysql database.

 * 

 * @param gmyth_epg the GMythEPG instance.

 * @param glist_ptr the GList pointer to be filled with the loaded list address.

 * @return The amount of channels retrieved from database,  or -1 if error.

 */

gint

gmyth_epg_get_channel_list (GMythEPG *gmyth_epg, GList **glist_ptr)

{

	MYSQL_RES *msql_res;

    assert(gmyth_epg);

    msql_res = gmyth_query_process_statement (gmyth_epg->sqlquery, 

    		"SELECT chanid, channum, name FROM channel;");

	(*glist_ptr) = NULL;

    if (msql_res == NULL) {

        g_warning ("[%s] msql query returned NULL MYSQL_RES", __FUNCTION__);

		return -1;

    } else {

        MYSQL_ROW row;

		GMythChannelInfo *channel_info;        

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

        	channel_info = g_new0(GMythChannelInfo, 1);

            channel_info->channel_ID = g_ascii_strtoull (row[0], NULL, 10);

            channel_info->channel_num = g_string_new (row[1]);

            channel_info->channel_name = g_string_new (row[2]);

            gmyth_channel_info_print(channel_info);

            (*glist_ptr) = g_list_append ((*glist_ptr), channel_info);

    	}

    }

    mysql_free_result (msql_res);

    return (!(*glist_ptr)) ?  0 : g_list_length (*glist_ptr);

}

/** 

 * Retrieves the available list of channels from the backend Mysql database.

 * 

 * @param gmyth_epg the GMythEPG instance.

 * @param proglist the GList pointer to be filled with the loaded list.

 * @param chan_num the channel num on which to search for program.

 * @param starttime the start time to search for programs.

 * @param endtime the end time to search for programs.

 * @return The amount of channels retrieved from database, or -1 if error.

 */

gint

gmyth_epg_get_program_list (GMythEPG *gmyth_epg, GList **proglist,

		const gint chan_num, GTimeVal *starttime, GTimeVal *endtime)

{

    gchar *startts = gmyth_util_time_to_string_from_time_val(starttime);

    gchar *endts = gmyth_util_time_to_string_from_time_val(endtime);

    MYSQL_ROW row;

    GString *querystr;

    assert(gmyth_epg);

    querystr = g_string_new(

        "SELECT DISTINCT program.chanid, program.starttime, program.endtime, "

        "    program.title, program.subtitle, program.description, "

        "    program.category, channel.channum, channel.callsign, "

        "    channel.name, program.previouslyshown, channel.commfree, "

        "    channel.outputfilters, program.seriesid, program.programid, "

        "    program.airdate, program.stars, program.originalairdate, "

        "    program.category_type, oldrecstatus.recordid, "

        "    oldrecstatus.rectype, oldrecstatus.recstatus, "

        "    oldrecstatus.findid "

        "FROM program "

        "LEFT JOIN channel ON program.chanid = channel.chanid "

        "LEFT JOIN oldrecorded AS oldrecstatus ON "

        "    program.title = oldrecstatus.title AND "

        "    channel.callsign = oldrecstatus.station AND "

        "    program.starttime = oldrecstatus.starttime "

        );

    g_string_append_printf (querystr, 

        "WHERE program.chanid = %d "

        "  AND program.endtime >= '%s' "

        "  AND program.starttime <= '%s' "

        "  AND program.manualid = 0 ",

        chan_num, startts, endts);

    if (!g_strrstr(querystr->str, " GROUP BY "))

        querystr = g_string_append(querystr,

            " GROUP BY program.starttime, channel.channum, "

            "  channel.callsign, program.title ");

    if (!g_strrstr(querystr->str, " LIMIT "))

        querystr = g_string_append(querystr, " LIMIT 1000 ");

    MYSQL_RES *res_set = 

        gmyth_query_process_statement(gmyth_epg->sqlquery, querystr->str);

    if (res_set == NULL) {

        g_warning ("[%s] msql query returned NULL MYSQL_RES", __FUNCTION__);

		return -1;

    }

    (*proglist) = NULL;        

    while ((row = mysql_fetch_row (res_set)) != NULL) {

        GMythProgramInfo *p = gmyth_program_info_new ();

        p->chanid = g_string_new (row[0]);

        p->startts = gmyth_util_string_to_time_val (row[1]);

        p->endts = gmyth_util_string_to_time_val (row[2]);

        p->recstartts = g_new0 (GTimeVal, 1);

	p->recstartts->tv_sec  = p->startts->tv_sec;

	p->recstartts->tv_usec = p->startts->tv_usec;

        p->recendts = g_new0 (GTimeVal, 1);

	p->recendts->tv_sec  = p->endts->tv_sec;

	p->recendts->tv_usec = p->endts->tv_usec;

        p->lastmodified = g_new0 (GTimeVal, 1);

	p->lastmodified->tv_sec  = p->startts->tv_sec;

	p->lastmodified->tv_usec = p->startts->tv_usec;

        p->title = g_string_new (row[3]);

        p->subtitle = g_string_new (row[4]);

        p->description = g_string_new (row[5]);

        p->category = g_string_new (row[6]);

        p->chanstr = g_string_new (row[7]);

        p->chansign = g_string_new (row[8]);

        p->channame = g_string_new (row[9]);

        p->repeat = g_ascii_strtoull(row[10], NULL, 10);

        p->chancommfree = g_ascii_strtoull(row[11], NULL, 10);

        p->chanOutputFilters = g_string_new (row[12]);

        p->seriesid = g_string_new (row[13]);

        p->programid = g_string_new (row[14]);

        p->year = g_string_new (row[15]);

        p->stars = g_ascii_strtod(row[16], NULL);

        if (!row[17] || !strcmp(row[17], "")) {

            p->originalAirDate = 0;

            p->hasAirDate = FALSE;

        } else {

            p->originalAirDate = gmyth_util_string_to_time_val (row[17]);

            p->hasAirDate = TRUE;

        }

        p->catType = g_string_new (row[18]);

        *proglist = g_list_append((*proglist), p);

#if 0        

        gmyth_program_info_print(p);

#endif        

    }

    /* deallocate */

    mysql_free_result (res_set);

    g_string_free(querystr, TRUE);

    return TRUE;

}