/* GStreamer
 * Copyright (C) 2001 Steve Baker <stevebaker_org@yahoo.co.uk>
 *
 * gstdparam.c: Dynamic Parameter functionality
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <math.h>
#include <string.h>
#include <gst/gstinfo.h>

#include "dparam.h"
#include "dparammanager.h"

static void gst_dparam_class_init (GstDParamClass *klass);
static void gst_dparam_init (GstDParam *dparam);
static void gst_dparam_dispose (GObject *object);
static void gst_dparam_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static void gst_dparam_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);

enum {
	ARG_0,
	ARG_VALUE_FLOAT,
	ARG_VALUE_INT,
	ARG_VALUE_INT64,
};

enum {
  VALUE_CHANGED,
  LAST_SIGNAL
};

static guint gst_dparam_signals[LAST_SIGNAL] = { 0 };

GType 
gst_dparam_get_type(void) {
	static GType dparam_type = 0;

	if (!dparam_type) {
		static const GTypeInfo dparam_info = {
			sizeof(GstDParamClass),
			NULL,
			NULL,
			(GClassInitFunc)gst_dparam_class_init,
			NULL,
			NULL,
			sizeof(GstDParam),
			0,
			(GInstanceInitFunc)gst_dparam_init,
		};
		dparam_type = g_type_register_static(GST_TYPE_OBJECT, "GstDParam", &dparam_info, 0);
	}
	return dparam_type;
}

static void
gst_dparam_class_init (GstDParamClass *klass)
{
	GObjectClass *gobject_class;
	GstDParamClass *dparam_class;
	GstObjectClass *gstobject_class;

	gobject_class = (GObjectClass*)klass;
	dparam_class = (GstDParamClass*)klass;
	gstobject_class = (GstObjectClass*) klass;

	gobject_class->get_property = gst_dparam_get_property;
	gobject_class->set_property = gst_dparam_set_property;

	g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_VALUE_FLOAT,
		g_param_spec_float("value_float","Float Value",
		             "The value that should be changed if gfloat is the type",
                     -G_MAXFLOAT, G_MAXFLOAT, 0.0F, G_PARAM_READWRITE));
	g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_VALUE_INT,
		g_param_spec_int("value_int","Integer Value",
		             "The value that should be changed if gint is the type",
                     G_MININT, G_MAXINT, 0, G_PARAM_READWRITE));
	g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_VALUE_INT64,
		g_param_spec_int64("value_int64","64 bit Integer Value",
		             "The value that should be changed if gint64 is the type",
                     G_MININT64, G_MAXINT64, 0, G_PARAM_READWRITE));
                     
	gobject_class->dispose = gst_dparam_dispose;
	
	gst_dparam_signals[VALUE_CHANGED] =
		g_signal_new ("value_changed", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
		              G_STRUCT_OFFSET (GstDParamClass, value_changed), NULL, NULL,
		              gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
	/*gstobject_class->save_thyself = gst_dparam_save_thyself; */

}

static void
gst_dparam_init (GstDParam *dparam)
{
	g_return_if_fail (dparam != NULL);
	GST_DPARAM_TYPE(dparam) = 0;
	GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam)=0LL;
	GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam)=0LL;
	GST_DPARAM_READY_FOR_UPDATE(dparam)=FALSE;
	dparam->lock = g_mutex_new ();
}

/**
 * gst_dparam_new:
 * @type: the type that this dparam will store
 *
 * Returns: a new instance of GstDParam
 */
GstDParam* 
gst_dparam_new (GType type)
{
	GstDParam *dparam;

	dparam = g_object_new (gst_dparam_get_type (), NULL);
	dparam->do_update_func = gst_dparam_do_update_default;

	GST_DPARAM_TYPE(dparam) = type;
	
	return dparam;
}


static void 
gst_dparam_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
	GstDParam *dparam;
	g_return_if_fail(GST_IS_DPARAM(object));
	dparam = GST_DPARAM(object);
  
	switch (prop_id) {   
		case ARG_VALUE_FLOAT:
			g_value_set_float (value, dparam->value_float);
			break;
			
		case ARG_VALUE_INT:
			g_value_set_float (value, dparam->value_int);
			break;
			
		case ARG_VALUE_INT64:
			g_value_set_float (value, dparam->value_int64);
			break;
		default:
			G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
			break;
	}
}

static void 
gst_dparam_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) 
{
	GstDParam *dparam;
	g_return_if_fail(GST_IS_DPARAM(object));
	dparam = GST_DPARAM(object);
	GST_DPARAM_LOCK(dparam);

	switch (prop_id) {
		case ARG_VALUE_FLOAT:
			GST_DEBUG(GST_CAT_PARAMS, "setting value from %f to %f", dparam->value_float, g_value_get_float (value));
			dparam->value_float = g_value_get_float (value);
			GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam);
			GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
			break;
			
		case ARG_VALUE_INT:
			GST_DEBUG(GST_CAT_PARAMS, "setting value from %d to %d", dparam->value_int, g_value_get_int (value));
			dparam->value_int = g_value_get_int (value);
			GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam);
			GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
			break;
			
		case ARG_VALUE_INT64:
			GST_DEBUG(GST_CAT_PARAMS, "setting value from %"
						  G_GINT64_FORMAT " to %"
						  G_GINT64_FORMAT,
				  dparam->value_int64, g_value_get_int64 (value));
			dparam->value_int64 = g_value_get_int (value);
			GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam);
			GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
			break;
			
		default:
			break;
	}

	/* note that this signal is sent while we still have the lock. */
	g_signal_emit (G_OBJECT (dparam), gst_dparam_signals[VALUE_CHANGED], 0);
	GST_DPARAM_UNLOCK(dparam);
}

void
gst_dparam_do_update_default (GstDParam *dparam, gint64 timestamp, GValue *value, GstDParamUpdateInfo update_info)
{
	GST_DPARAM_LOCK(dparam);
	
	g_return_if_fail (G_VALUE_TYPE(value) == GST_DPARAM_TYPE(dparam));
	GST_DEBUG(GST_CAT_PARAMS, "updating value for %s(%p)",GST_DPARAM_NAME (dparam),dparam);
	
	switch (G_VALUE_TYPE(value)) {
		case G_TYPE_FLOAT:
			g_value_set_float(value, dparam->value_float);
			break;
			
		case G_TYPE_INT:
			g_value_set_int(value, dparam->value_int);
			break;
			
		case G_TYPE_INT64:
			g_value_set_int64(value, dparam->value_int64);
			break;
			
		default:
			break;
	}

	GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam) = timestamp;
	GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = timestamp;
	GST_DPARAM_READY_FOR_UPDATE(dparam) = FALSE;

	GST_DPARAM_UNLOCK(dparam);
}

static void
gst_dparam_dispose (GObject *object)
{
	GstDParam *dparam = GST_DPARAM(object);
	gchar *dparam_name = g_strdup(GST_DPARAM_NAME(dparam));
	
	GST_DEBUG (GST_CAT_PLUGIN_INFO, "disposing of %s", dparam_name);
	if (GST_DPARAM_MANAGER(dparam)){
		gst_dpman_detach_dparam(GST_DPARAM_MANAGER(dparam), dparam_name);
	}
	g_free(dparam_name);
}

/**
 * gst_dparam_attach
 * @dparam: GstDParam instance
 * @manager: the GstDParamManager that this dparam belongs to
 *
 */
void
gst_dparam_attach (GstDParam *dparam, GstDParamManager *manager, GParamSpec *param_spec, gchar *unit_name)
{
	
	g_return_if_fail (dparam != NULL);
	g_return_if_fail (GST_IS_DPARAM (dparam));
	g_return_if_fail (manager != NULL);
	g_return_if_fail (GST_IS_DPMAN (manager));
	g_return_if_fail (param_spec != NULL);
	g_return_if_fail (unit_name != NULL);
	g_return_if_fail (G_IS_PARAM_SPEC (param_spec));

	GST_DPARAM_NAME(dparam) = g_param_spec_get_name(param_spec);
	GST_DPARAM_PARAM_SPEC(dparam) = param_spec;
	GST_DPARAM_MANAGER(dparam) = manager;
	GST_DPARAM_UNIT_NAME(dparam) = unit_name;
	GST_DPARAM_IS_LOG(dparam) = gst_unitconv_unit_is_logarithmic(unit_name);
	GST_DEBUG(GST_CAT_PARAMS, "attaching %s to dparam %p",GST_DPARAM_NAME (dparam),dparam);

}

/**
 * gst_dparam_detach
 * @dparam: GstDParam instance
 * @manager: the GstDParamManager that this dparam belongs to
 *
 */
void
gst_dparam_detach (GstDParam *dparam)
{
	
	g_return_if_fail (dparam != NULL);
	g_return_if_fail (GST_IS_DPARAM (dparam));

	GST_DEBUG(GST_CAT_PARAMS, "detaching %s from dparam %p",GST_DPARAM_NAME (dparam),dparam);
	
	GST_DPARAM_NAME(dparam) = NULL;
	GST_DPARAM_PARAM_SPEC(dparam) = NULL;
	GST_DPARAM_MANAGER(dparam) = NULL;
}