#include "config.h"

#include <stdexcept>

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

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


namespace {

static_assert(ChorusMaxDelay >= AL_CHORUS_MAX_DELAY, "Chorus max delay too small");
static_assert(FlangerMaxDelay >= AL_FLANGER_MAX_DELAY, "Flanger max delay too small");

static_assert(AL_CHORUS_WAVEFORM_SINUSOID == AL_FLANGER_WAVEFORM_SINUSOID, "Chorus/Flanger waveform value mismatch");
static_assert(AL_CHORUS_WAVEFORM_TRIANGLE == AL_FLANGER_WAVEFORM_TRIANGLE, "Chorus/Flanger waveform value mismatch");

inline al::optional<ChorusWaveform> WaveformFromEnum(ALenum type)
{
    switch(type)
    {
    case AL_CHORUS_WAVEFORM_SINUSOID: return al::make_optional(ChorusWaveform::Sinusoid);
    case AL_CHORUS_WAVEFORM_TRIANGLE: return al::make_optional(ChorusWaveform::Triangle);
    }
    return al::nullopt;
}
inline ALenum EnumFromWaveform(ChorusWaveform type)
{
    switch(type)
    {
    case ChorusWaveform::Sinusoid: return AL_CHORUS_WAVEFORM_SINUSOID;
    case ChorusWaveform::Triangle: return AL_CHORUS_WAVEFORM_TRIANGLE;
    }
    throw std::runtime_error{"Invalid chorus waveform: "+std::to_string(static_cast<int>(type))};
}

void Chorus_setParami(EffectProps *props, ALenum param, int val)
{
    switch(param)
    {
    case AL_CHORUS_WAVEFORM:
        if(auto formopt = WaveformFromEnum(val))
            props->Chorus.Waveform = *formopt;
        else
            throw effect_exception{AL_INVALID_VALUE, "Invalid chorus waveform: 0x%04x", val};
        break;

    case AL_CHORUS_PHASE:
        if(!(val >= AL_CHORUS_MIN_PHASE && val <= AL_CHORUS_MAX_PHASE))
            throw effect_exception{AL_INVALID_VALUE, "Chorus phase out of range: %d", val};
        props->Chorus.Phase = val;
        break;

    default:
        throw effect_exception{AL_INVALID_ENUM, "Invalid chorus integer property 0x%04x", param};
    }
}
void Chorus_setParamiv(EffectProps *props, ALenum param, const int *vals)
{ Chorus_setParami(props, param, vals[0]); }
void Chorus_setParamf(EffectProps *props, ALenum param, float val)
{
    switch(param)
    {
    case AL_CHORUS_RATE:
        if(!(val >= AL_CHORUS_MIN_RATE && val <= AL_CHORUS_MAX_RATE))
            throw effect_exception{AL_INVALID_VALUE, "Chorus rate out of range: %f", val};
        props->Chorus.Rate = val;
        break;

    case AL_CHORUS_DEPTH:
        if(!(val >= AL_CHORUS_MIN_DEPTH && val <= AL_CHORUS_MAX_DEPTH))
            throw effect_exception{AL_INVALID_VALUE, "Chorus depth out of range: %f", val};
        props->Chorus.Depth = val;
        break;

    case AL_CHORUS_FEEDBACK:
        if(!(val >= AL_CHORUS_MIN_FEEDBACK && val <= AL_CHORUS_MAX_FEEDBACK))
            throw effect_exception{AL_INVALID_VALUE, "Chorus feedback out of range: %f", val};
        props->Chorus.Feedback = val;
        break;

    case AL_CHORUS_DELAY:
        if(!(val >= AL_CHORUS_MIN_DELAY && val <= AL_CHORUS_MAX_DELAY))
            throw effect_exception{AL_INVALID_VALUE, "Chorus delay out of range: %f", val};
        props->Chorus.Delay = val;
        break;

    default:
        throw effect_exception{AL_INVALID_ENUM, "Invalid chorus float property 0x%04x", param};
    }
}
void Chorus_setParamfv(EffectProps *props, ALenum param, const float *vals)
{ Chorus_setParamf(props, param, vals[0]); }

void Chorus_getParami(const EffectProps *props, ALenum param, int *val)
{
    switch(param)
    {
    case AL_CHORUS_WAVEFORM:
        *val = EnumFromWaveform(props->Chorus.Waveform);
        break;

    case AL_CHORUS_PHASE:
        *val = props->Chorus.Phase;
        break;

    default:
        throw effect_exception{AL_INVALID_ENUM, "Invalid chorus integer property 0x%04x", param};
    }
}
void Chorus_getParamiv(const EffectProps *props, ALenum param, int *vals)
{ Chorus_getParami(props, param, vals); }
void Chorus_getParamf(const EffectProps *props, ALenum param, float *val)
{
    switch(param)
    {
    case AL_CHORUS_RATE:
        *val = props->Chorus.Rate;
        break;

    case AL_CHORUS_DEPTH:
        *val = props->Chorus.Depth;
        break;

    case AL_CHORUS_FEEDBACK:
        *val = props->Chorus.Feedback;
        break;

    case AL_CHORUS_DELAY:
        *val = props->Chorus.Delay;
        break;

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

const EffectProps genDefaultChorusProps() noexcept
{
    EffectProps props{};
    props.Chorus.Waveform = *WaveformFromEnum(AL_CHORUS_DEFAULT_WAVEFORM);
    props.Chorus.Phase = AL_CHORUS_DEFAULT_PHASE;
    props.Chorus.Rate = AL_CHORUS_DEFAULT_RATE;
    props.Chorus.Depth = AL_CHORUS_DEFAULT_DEPTH;
    props.Chorus.Feedback = AL_CHORUS_DEFAULT_FEEDBACK;
    props.Chorus.Delay = AL_CHORUS_DEFAULT_DELAY;
    return props;
}


void Flanger_setParami(EffectProps *props, ALenum param, int val)
{
    switch(param)
    {
    case AL_FLANGER_WAVEFORM:
        if(auto formopt = WaveformFromEnum(val))
            props->Chorus.Waveform = *formopt;
        else
            throw effect_exception{AL_INVALID_VALUE, "Invalid flanger waveform: 0x%04x", val};
        break;

    case AL_FLANGER_PHASE:
        if(!(val >= AL_FLANGER_MIN_PHASE && val <= AL_FLANGER_MAX_PHASE))
            throw effect_exception{AL_INVALID_VALUE, "Flanger phase out of range: %d", val};
        props->Chorus.Phase = val;
        break;

    default:
        throw effect_exception{AL_INVALID_ENUM, "Invalid flanger integer property 0x%04x", param};
    }
}
void Flanger_setParamiv(EffectProps *props, ALenum param, const int *vals)
{ Flanger_setParami(props, param, vals[0]); }
void Flanger_setParamf(EffectProps *props, ALenum param, float val)
{
    switch(param)
    {
    case AL_FLANGER_RATE:
        if(!(val >= AL_FLANGER_MIN_RATE && val <= AL_FLANGER_MAX_RATE))
            throw effect_exception{AL_INVALID_VALUE, "Flanger rate out of range: %f", val};
        props->Chorus.Rate = val;
        break;

    case AL_FLANGER_DEPTH:
        if(!(val >= AL_FLANGER_MIN_DEPTH && val <= AL_FLANGER_MAX_DEPTH))
            throw effect_exception{AL_INVALID_VALUE, "Flanger depth out of range: %f", val};
        props->Chorus.Depth = val;
        break;

    case AL_FLANGER_FEEDBACK:
        if(!(val >= AL_FLANGER_MIN_FEEDBACK && val <= AL_FLANGER_MAX_FEEDBACK))
            throw effect_exception{AL_INVALID_VALUE, "Flanger feedback out of range: %f", val};
        props->Chorus.Feedback = val;
        break;

    case AL_FLANGER_DELAY:
        if(!(val >= AL_FLANGER_MIN_DELAY && val <= AL_FLANGER_MAX_DELAY))
            throw effect_exception{AL_INVALID_VALUE, "Flanger delay out of range: %f", val};
        props->Chorus.Delay = val;
        break;

    default:
        throw effect_exception{AL_INVALID_ENUM, "Invalid flanger float property 0x%04x", param};
    }
}
void Flanger_setParamfv(EffectProps *props, ALenum param, const float *vals)
{ Flanger_setParamf(props, param, vals[0]); }

void Flanger_getParami(const EffectProps *props, ALenum param, int *val)
{
    switch(param)
    {
    case AL_FLANGER_WAVEFORM:
        *val = EnumFromWaveform(props->Chorus.Waveform);
        break;

    case AL_FLANGER_PHASE:
        *val = props->Chorus.Phase;
        break;

    default:
        throw effect_exception{AL_INVALID_ENUM, "Invalid flanger integer property 0x%04x", param};
    }
}
void Flanger_getParamiv(const EffectProps *props, ALenum param, int *vals)
{ Flanger_getParami(props, param, vals); }
void Flanger_getParamf(const EffectProps *props, ALenum param, float *val)
{
    switch(param)
    {
    case AL_FLANGER_RATE:
        *val = props->Chorus.Rate;
        break;

    case AL_FLANGER_DEPTH:
        *val = props->Chorus.Depth;
        break;

    case AL_FLANGER_FEEDBACK:
        *val = props->Chorus.Feedback;
        break;

    case AL_FLANGER_DELAY:
        *val = props->Chorus.Delay;
        break;

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

EffectProps genDefaultFlangerProps() noexcept
{
    EffectProps props{};
    props.Chorus.Waveform = *WaveformFromEnum(AL_FLANGER_DEFAULT_WAVEFORM);
    props.Chorus.Phase = AL_FLANGER_DEFAULT_PHASE;
    props.Chorus.Rate = AL_FLANGER_DEFAULT_RATE;
    props.Chorus.Depth = AL_FLANGER_DEFAULT_DEPTH;
    props.Chorus.Feedback = AL_FLANGER_DEFAULT_FEEDBACK;
    props.Chorus.Delay = AL_FLANGER_DEFAULT_DELAY;
    return props;
}

} // namespace

DEFINE_ALEFFECT_VTABLE(Chorus);

const EffectProps ChorusEffectProps{genDefaultChorusProps()};

DEFINE_ALEFFECT_VTABLE(Flanger);

const EffectProps FlangerEffectProps{genDefaultFlangerProps()};