#include "config.h"

#include <cstdlib>

#include "AL/al.h"
#include "AL/alc.h"

#include "alMain.h"
#include "alcontext.h"
#include "alAuxEffectSlot.h"
#include "alError.h"


namespace {

struct NullState final : public EffectState {
    NullState();
    ~NullState() override;

    ALboolean deviceUpdate(const ALCdevice *device) override;
    void update(const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props, const EffectTarget target) override;
    void process(ALsizei samplesToDo, const ALfloat (*RESTRICT samplesIn)[BUFFERSIZE], const ALsizei numInput, ALfloat (*RESTRICT samplesOut)[BUFFERSIZE], const ALsizei numOutput) override;

    DEF_NEWDEL(NullState)
};

/* This constructs the effect state. It's called when the object is first
 * created.
 */
NullState::NullState() = default;

/* This destructs the effect state. It's called only when the effect slot is no
 * longer used prior to being freed.
 */
NullState::~NullState() = default;

/* This updates the device-dependant effect state. This is called on
 * initialization and any time the device parameters (eg. playback frequency,
 * format) have been changed.
 */
ALboolean NullState::deviceUpdate(const ALCdevice* UNUSED(device))
{
    return AL_TRUE;
}

/* This updates the effect state. This is called any time the effect is
 * (re)loaded into a slot.
 */
void NullState::update(const ALCcontext* UNUSED(context), const ALeffectslot* UNUSED(slot), const ALeffectProps* UNUSED(props), const EffectTarget UNUSED(target))
{
}

/* This processes the effect state, for the given number of samples from the
 * input to the output buffer. The result should be added to the output buffer,
 * not replace it.
 */
void NullState::process(ALsizei /*samplesToDo*/, const ALfloat (*RESTRICT /*samplesIn*/)[BUFFERSIZE], const ALsizei /*numInput*/, ALfloat (*RESTRICT /*samplesOut*/)[BUFFERSIZE], const ALsizei /*numOutput*/)
{
}


void Null_setParami(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALint UNUSED(val))
{
    switch(param)
    {
    default:
        alSetError(context, AL_INVALID_ENUM, "Invalid null effect integer property 0x%04x", param);
    }
}
void Null_setParamiv(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, const ALint* UNUSED(vals))
{
    switch(param)
    {
    default:
        alSetError(context, AL_INVALID_ENUM, "Invalid null effect integer-vector property 0x%04x", param);
    }
}
void Null_setParamf(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALfloat UNUSED(val))
{
    switch(param)
    {
    default:
        alSetError(context, AL_INVALID_ENUM, "Invalid null effect float property 0x%04x", param);
    }
}
void Null_setParamfv(ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, const ALfloat* UNUSED(vals))
{
    switch(param)
    {
    default:
        alSetError(context, AL_INVALID_ENUM, "Invalid null effect float-vector property 0x%04x", param);
    }
}

void Null_getParami(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALint* UNUSED(val))
{
    switch(param)
    {
    default:
        alSetError(context, AL_INVALID_ENUM, "Invalid null effect integer property 0x%04x", param);
    }
}
void Null_getParamiv(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALint* UNUSED(vals))
{
    switch(param)
    {
    default:
        alSetError(context, AL_INVALID_ENUM, "Invalid null effect integer-vector property 0x%04x", param);
    }
}
void Null_getParamf(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALfloat* UNUSED(val))
{
    switch(param)
    {
    default:
        alSetError(context, AL_INVALID_ENUM, "Invalid null effect float property 0x%04x", param);
    }
}
void Null_getParamfv(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum param, ALfloat* UNUSED(vals))
{
    switch(param)
    {
    default:
        alSetError(context, AL_INVALID_ENUM, "Invalid null effect float-vector property 0x%04x", param);
    }
}

DEFINE_ALEFFECT_VTABLE(Null);


struct NullStateFactory final : public EffectStateFactory {
    EffectState *create() override;
    ALeffectProps getDefaultProps() const noexcept override;
    const EffectVtable *getEffectVtable() const noexcept override { return &Null_vtable; }
};

/* Creates EffectState objects of the appropriate type. */
EffectState *NullStateFactory::create()
{ return new NullState{}; }

/* Returns an ALeffectProps initialized with this effect's default properties. */
ALeffectProps NullStateFactory::getDefaultProps() const noexcept
{
    ALeffectProps props{};
    return props;
}

} // namespace

EffectStateFactory *NullStateFactory_getFactory()
{
    static NullStateFactory NullFactory{};
    return &NullFactory;
}