/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * controls.cpp - Control handling
 */

#include <libcamera/controls.h>

#include <iomanip>
#include <sstream>
#include <string>
#include <string.h>

#include "control_validator.h"
#include "log.h"
#include "utils.h"

/**
 * \file controls.h
 * \brief Framework to manage controls related to an object
 *
 * A control is a mean to govern or influence the operation of an object, and in
 * particular of a camera. Every control is defined by a unique numerical ID, a
 * name string and the data type of the value it stores. The libcamera API
 * defines a set of standard controls in the libcamera::controls namespace, as
 * a set of instances of the Control class.
 *
 * The main way for applications to interact with controls is through the
 * ControlList stored in the Request class:
 *
 * \code{.cpp}
 * Request *req = ...;
 * ControlList &controls = req->controls();
 * controls->set(controls::AwbEnable, false);
 * controls->set(controls::ManualExposure, 1000);
 *
 * ...
 *
 * int32_t exposure = controls->get(controls::ManualExposure);
 * \endcode
 *
 * The ControlList::get() and ControlList::set() methods automatically deduce
 * the data type based on the control.
 */

namespace libcamera {

LOG_DEFINE_CATEGORY(Controls)

namespace {

static constexpr size_t ControlValueSize[] = {
	[ControlTypeNone]		= 0,
	[ControlTypeBool]		= sizeof(bool),
	[ControlTypeByte]		= sizeof(uint8_t),
	[ControlTypeInteger32]		= sizeof(int32_t),
	[ControlTypeInteger64]		= sizeof(int64_t),
	[ControlTypeFloat]		= sizeof(float),
	[ControlTypeString]		= sizeof(char),
	[ControlTypeRectangle]		= sizeof(Rectangle),
	[ControlTypeSize]		= sizeof(Size),
};

} /* namespace */

/**
 * \enum ControlType
 * \brief Define the data type of a Control
 * \var ControlTypeNone
 * Invalid type, for empty values
 * \var ControlTypeBool
 * The control stores a boolean value
 * \var ControlTypeByte
 * The control stores a byte value as an unsigned 8-bit integer
 * \var ControlTypeInteger32
 * The control stores a 32-bit integer value
 * \var ControlTypeInteger64
 * The control stores a 64-bit integer value
 * \var ControlTypeFloat
 * The control stores a 32-bit floating point value
 * \var ControlTypeString
 * The control stores a string value as an array of char
 */

/**
 * \class ControlValue
 * \brief Abstract type representing the value of a control
 */

/** \todo Revisit the ControlValue layout when stabilizing the ABI */
static_assert(sizeof(ControlValue) == 16, "Invalid size of ControlValue class");

/**
 * \brief Construct an empty ControlValue.
 */
ControlValue::ControlValue()