/*
 * Copyright (C) 2012 - Juan Ferrer Toribio
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>
#include "sql-value.h"

/**
 * SECTION: sql-value
 * @Short_description: generic value
 * @Title: SqlValue
 * 
 * A generic value that can be used in operations (#SqlOperation) and of course
 * in any place where an #SqlExpr can be used.
 **/
G_DEFINE_TYPE (SqlValue, sql_value, SQL_TYPE_EXPR);

SqlExpr * sql_value_new ()
{
	return g_object_new (SQL_TYPE_VALUE, NULL);
}

SqlExpr * sql_value_new_with_value (const GValue * value)
{
	g_return_val_if_fail (value, NULL);
	g_return_val_if_fail (G_IS_VALUE (value), NULL);

	return g_object_new (SQL_TYPE_VALUE, "value", value, NULL);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Private

static void sql_value_render (SqlValue * obj, SqlRender * render)
{
	GValue * value = obj->value;
	GType type = G_VALUE_TYPE (value);

	switch (type)
	{
		case G_TYPE_BOOLEAN:
			sql_render_add_token (render, g_value_get_boolean (value) ? "TRUE" : "FALSE");
			break;
		case G_TYPE_CHAR:
			sql_render_printf (render, "'%c'", g_value_get_schar (value));
			break;
		case G_TYPE_INT:
			sql_render_printf (render, "%i", g_value_get_int (value));
			break;
		case G_TYPE_UINT:
			sql_render_printf (render, "%u", g_value_get_uint (value));
			break;
		case G_TYPE_LONG:
			sql_render_printf (render, "%ld", g_value_get_long (value));
			break;
		case G_TYPE_ULONG:
			sql_render_printf (render, "%lu", g_value_get_ulong (value));
			break;
		case G_TYPE_FLOAT:
		case G_TYPE_DOUBLE:
		{
			gchar buffer[G_ASCII_DTOSTR_BUF_SIZE];
			g_ascii_dtostr (buffer, G_ASCII_DTOSTR_BUF_SIZE,
				(type == G_TYPE_FLOAT)
				?(gdouble) g_value_get_float (value)
				:g_value_get_double (value)
			);
			sql_render_add_espace (render);
			sql_render_append (render, buffer);
			break;
		}
		case G_TYPE_STRING:
			sql_render_append_with_delimiter (render, g_value_get_string (value), '\'');
			break;
		default:
		if (type == G_TYPE_DATE)
		{
			GDate * date = g_value_get_boxed (value);
			sql_render_printf (render, "'%04i-%02i-%02i'"
				,g_date_get_year (date)
				,g_date_get_month (date)
				,g_date_get_day (date)
			);
		}
		else if (type == G_TYPE_DATE_TIME)
		{
			GDateTime * date_time = g_value_get_boxed (value);
			sql_render_printf (render, g_date_time_format (date_time, "'%Y-%m-%d %T'"));
		}
		else if (type == GVN_TYPE_NULL)
			sql_render_add_token (render, "NULL");
		else
			sql_render_set_error (render);
	}
}

static gboolean sql_value_is_ready (SqlValue * obj)
{
	return !gvn_value_is_null (obj->value);
}

static void sql_value_set_real_value (SqlValue * obj, const GValue * value)
{
	if (gvn_value_ccopy (value, obj->value))
		g_signal_emit_by_name (obj, "changed");
}

static void sql_value_cb_value_changed (GvnParam * param, const GValue * value, SqlValue * obj)
{
	sql_value_set_real_value (obj, value);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Public

const GValue * sql_value_get_value (SqlValue * obj)
{
	g_return_val_if_fail (SQL_IS_VALUE (obj), NULL);

	return obj->value;
}

void sql_value_set_value (SqlValue * obj, const GValue * value)
{
	g_return_if_fail (SQL_IS_VALUE (obj));
	g_return_if_fail (!obj->param);
	
	sql_value_set_real_value (obj, value);
}

void sql_value_set_param (SqlValue * obj, GvnParam * param)
{
	g_return_if_fail (SQL_IS_VALUE (obj));
	g_return_if_fail (GVN_IS_PARAM (param) || !param);
	
	if (obj->param)
	{
		g_signal_handlers_disconnect_by_func (obj->param,
			sql_value_cb_value_changed, obj);
		g_clear_object (&obj->param);
	}
	if (param)
	{
		obj->param = g_object_ref_sink (param);
		g_signal_connect (param, "value-changed",
			G_CALLBACK (sql_value_cb_value_changed), obj);
		sql_value_set_real_value (obj, gvn_param_get_value (param));
	}
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Properties

enum
{
	 PROP_PARAM = 1
	,PROP_VALUE
};

static void sql_value_set_property (SqlValue * obj, guint id, const GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_PARAM:
			sql_value_set_param (obj, g_value_get_object (value));
			break;
		case PROP_VALUE:
			sql_value_set_value (obj, g_value_get_boxed (value));
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

static void sql_value_get_property (SqlValue * obj, guint id, GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_PARAM:
			g_value_set_object (value, obj->param);
			break;
		case PROP_VALUE:
			g_value_set_boxed (value, obj->value);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Class

static void sql_value_init (SqlValue * obj)
{
	obj->param = NULL;
	obj->value = g_new0 (GValue, 1);
	g_value_init (obj->value, GVN_TYPE_NULL);
}

static void sql_value_finalize (SqlValue * obj)
{
	sql_value_set_param (obj, NULL);
	g_value_unset (obj->value);
	g_free (obj->value);
	G_OBJECT_CLASS (sql_value_parent_class)->finalize (G_OBJECT (obj));
}

static void sql_value_class_init (SqlValueClass * klass)
{
	GObjectClass * k = G_OBJECT_CLASS (klass);
	k->finalize = (GObjectFinalizeFunc) sql_value_finalize;
	k->set_property = (GObjectSetPropertyFunc) sql_value_set_property;
	k->get_property = (GObjectGetPropertyFunc) sql_value_get_property;
	SQL_OBJECT_CLASS (klass)->render = (SqlRenderFunc) sql_value_render;
	SQL_OBJECT_CLASS (klass)->is_ready = (SqlObjectIsReadyFunc) sql_value_is_ready;

	g_object_class_install_property (k, PROP_PARAM,
		g_param_spec_object ("param"
			,_("Param")
			,_("The param which is linked")
			,GVN_TYPE_PARAM, G_PARAM_READWRITE
	));

	g_object_class_install_property (k, PROP_VALUE,
		g_param_spec_boxed ("value"
			,_("Value")
			,_("The value")
			,G_TYPE_VALUE, G_PARAM_READWRITE
	));
}