#include "config.h"

#include <stdexcept>

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

#include "alc/effects/base.h"
#include "aloptional.h"
#include "effects.h"


namespace {

al::optional<ModulatorWaveform> WaveformFromEmum(ALenum value)
{
    switch(value)
    {
    case AL_RING_MODULATOR_SINUSOID: return al::make_optional(ModulatorWaveform::Sinusoid);
    case AL_RING_MODULATOR_SAWTOOTH: return al::make_optional(ModulatorWaveform::Sawtooth);
    case AL_RING_MODULATOR_SQUARE: return al::make_optional(ModulatorWaveform::Square);
    }
    return al::nullopt;
}
ALenum EnumFromWaveform(ModulatorWaveform type)
{
    switch(type)
    {
    case ModulatorWaveform::Sinusoid: return AL_RING_MODULATOR_SINUSOID;
    case ModulatorWaveform::Sawtooth: return AL_RING_MODULATOR_SAWTOOTH;
    case ModulatorWaveform::Square: return AL_RING_MODULATOR_SQUARE;
    }
    throw std::runtime_error{"Invalid modulator waveform: " +
        std::to_string(static_cast<int>(type))};
}

void Modulator_setParamf(EffectProps *props, ALenum param, float val)
{
    switch(param)
    {
    case AL_RING_MODULATOR_FREQUENCY:
        if(!(val >= AL_RING_MODULATOR_MIN_FREQUENCY && val <= AL_RING_MODULATOR_MAX_FREQUENCY))
            throw effect_exception{AL_INVALID_VALUE, "Modulator frequency out of range: %f", val};
        props->Modulator.Frequency = val;
        break;

    case AL_RING_MODULATOR_HIGHPASS_CUTOFF:
        if(!(val >= AL_RING_MODULATOR_MIN_HIGHPASS_CUTOFF && val <= AL_RING_MODULATOR_MAX_HIGHPASS_CUTOFF))
            throw effect_exception{AL_INVALID_VALUE, "Modulator high-pass cutoff out of range: %f", val};
        props->Modulator.HighPassCutoff = val;
        break;

    default:
        throw effect_exception{AL_INVALID_ENUM, "Invalid modulator float property 0x%04x", param};
    }
}
void Modulator_setParamfv(EffectProps *props, ALenum param, const float *vals)
{ Modulator_setParamf(props, param, vals[0]); }
void Modulator_setParami(EffectProps *props, ALenum param, int val)
{
    switch(param)
    {
    case AL_RING_MODULATOR_FREQUENCY:
    case AL_RING_MODULATOR_HIGHPASS_CUTOFF:
        Modulator_setParamf(props, param, static_cast<float>(val));
        break;

    case AL_RING_MODULATOR_WAVEFORM:
        if(auto formopt = WaveformFromEmum(val))
            props->Modulator.Waveform = *formopt;
        else
            throw effect_exception{AL_INVALID_VALUE, "Invalid modulator waveform: 0x%04x", val};
        break;

    default:
        throw effect_exception{AL_INVALID_ENUM, "Invalid modulator integer property 0x%04x",
            param};
    }
}
void Modulator_setParamiv(EffectProps *props, ALenum param, const int *vals)
{ Modulator_setParami(props, param, vals[0]); }

void Modulator_getParami(const EffectProps *props, ALenum param, int *val)
{
    switch(param)
    {
    case AL_RING_MODULATOR_FREQUENCY:
        *val = static_cast<int>(props->Modulator.Frequency);
        break;
    case AL_RING_MODULATOR_HIGHPASS_CUTOFF:
        *val = static_cast<int>(props->Modulator.HighPassCutoff);
        break;
    case AL_RING_MODULATOR_WAVEFORM:
        *val = EnumFromWaveform(props->Modulator.Waveform);
        break;

    default:
        throw effect_exception{AL_INVALID_ENUM, "Invalid modulator integer property 0x%04x",
            param};
    }
}
void Modulator_getParamiv(const EffectProps *props, ALenum param, int *vals)
{ Modulator_getParami(props, param, vals); }
void Modulator_getParamf(const EffectProps *props, ALenum param, float *val)
{
    switch(param)
    {
    case AL_RING_MODULATOR_FREQUENCY:
        *val = props->Modulator.Frequency;
        break;
    case AL_RING_MODULATOR_HIGHPASS_CUTOFF:
        *val = props->Modulator.HighPassCutoff;
        break;

    default:
        throw effect_exception{AL_INVALID_ENUM, "Invalid modulator float property 0x%04x", param};
    }
}
void Modulator_getParamfv(const EffectProps *props, ALenum param, float *vals)
{ Modulator_getParamf(props, param, vals); }

EffectProps genDefaultProps() noexcept
{
    EffectProps props{};
    props.Modulator.Frequency      = AL_RING_MODULATOR_DEFAULT_FREQUENCY;
    props.Modulator.HighPassCutoff = AL_RING_MODULATOR_DEFAULT_HIGHPASS_CUTOFF;
    props.Modulator.Waveform       = *WaveformFromEmum(AL_RING_MODULATOR_DEFAULT_WAVEFORM);
    return props;
}

} // namespace

DEFINE_ALEFFECT_VTABLE(Modulator);

const EffectProps ModulatorEffectProps{genDefaultProps()};