/**
 * OpenAL cross platform audio library
 * Copyright (C) 1999-2007 by authors.
 * This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 *  Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the
 *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 *  Boston, MA  02111-1307, USA.
 * Or go to http://www.gnu.org/copyleft/lgpl.html
 */

#include "config.h"

#include <stdlib.h>
#include <math.h>

#include "AL/al.h"
#include "AL/alc.h"
#include "alMain.h"
#include "alAuxEffectSlot.h"
#include "alThunk.h"
#include "alError.h"
#include "alSource.h"


static ALvoid InitializeEffect(ALCcontext *Context, ALeffectslot *EffectSlot, ALeffect *effect);

#define LookupEffectSlot(m, k) ((ALeffectslot*)LookupUIntMapKey(&(m), (k)))
#define LookupEffect(m, k) ((ALeffect*)LookupUIntMapKey(&(m), (k)))

AL_API ALvoid AL_APIENTRY alGenAuxiliaryEffectSlots(ALsizei n, ALuint *effectslots)
{
    ALCcontext *Context;
    ALCdevice *Device;

    Context = GetLockedContext();
    if(!Context) return;

    Device = Context->Device;
    if(n < 0 || IsBadWritePtr((void*)effectslots, n * sizeof(ALuint)))
        alSetError(Context, AL_INVALID_VALUE);
    else if((ALuint)n > Device->AuxiliaryEffectSlotMax - Context->EffectSlotMap.size)
        alSetError(Context, AL_INVALID_VALUE);
    else
    {
        ALenum err;
        ALsizei i, j;

        i = 0;
        while(i < n)
        {
            ALeffectslot *slot = calloc(1, sizeof(ALeffectslot));
            if(!slot || !(slot->EffectState=NoneCreate()))
            {
                free(slot);
                // We must have run out or memory
                alSetError(Context, AL_OUT_OF_MEMORY);
                alDeleteAuxiliaryEffectSlots(i, effectslots);
                break;
            }

            err = NewThunkEntry(&slot->effectslot);
            if(err == AL_NO_ERROR)
                err = InsertUIntMapEntry(&Context->EffectSlotMap, slot->effectslot, slot);
            if(err != AL_NO_ERROR)
            {
                FreeThunkEntry(slot->effectslot);
                ALEffect_Destroy(slot->EffectState);
                free(slot);

                alSetError(Context, err);
                alDeleteAuxiliaryEffectSlots(i, effectslots);
                break;
            }

            effectslots[i++] = slot->effectslot;

            slot->Gain = 1.0;
            slot->AuxSendAuto = AL_TRUE;
            slot->NeedsUpdate = AL_FALSE;
            for(j = 0;j < BUFFERSIZE;j++)
                slot->WetBuffer[j] = 0.0f;
            for(j = 0;j < 1;j++)
            {
                slot->ClickRemoval[j] = 0.0f;
                slot->PendingClicks[j] = 0.0f;
            }
            slot->refcount = 0;
        }
    }

    UnlockContext(Context);
}

AL_API ALvoid AL_APIENTRY alDeleteAuxiliaryEffectSlots(ALsizei n, ALuint *effectslots)
{
    ALCcontext *Context;
    ALeffectslot *EffectSlot;
    ALboolean SlotsValid = AL_FALSE;
    ALsizei i;

    Context = GetLockedContext();
    if(!Context) return;

    if(n < 0)
        alSetError(Context, AL_INVALID_VALUE);
    else
    {
        SlotsValid = AL_TRUE;
        // Check that all effectslots are valid
        for(i = 0;i < n;i++)
        {
            if((EffectSlot=LookupEffectSlot(Context->EffectSlotMap, effectslots[i])) == NULL)
            {
                alSetError(Context, AL_INVALID_NAME);
                SlotsValid = AL_FALSE;
                break;
            }
            else if(EffectSlot->refcount > 0)
            {
                alSetError(Context, AL_INVALID_NAME);
                SlotsValid = AL_FALSE;
                break;
            }
        }
    }

    if(SlotsValid)
    {
        // All effectslots are valid
        for(i = 0;i < n;i++)
        {
            // Recheck that the effectslot is valid, because there could be duplicated names
            if((EffectSlot=LookupEffectSlot(Context->EffectSlotMap, effectslots[i])) == NULL)
                continue;

            ALEffect_Destroy(EffectSlot->EffectState);

            RemoveUIntMapKey(&Context->EffectSlotMap, EffectSlot->effectslot);
            FreeThunkEntry(EffectSlot->effectslot);

            memset(EffectSlot, 0, sizeof(ALeffectslot));
            free(EffectSlot);
        }
    }

    UnlockContext(Context);
}

AL_API ALboolean AL_APIENTRY alIsAuxiliaryEffectSlot(ALuint effectslot)
{
    ALCcontext *Context;
    ALboolean  result;

    Context = GetLockedContext();
    if(!Context) return AL_FALSE;

    result = (LookupEffectSlot(Context->EffectSlotMap, effectslot) ?
              AL_TRUE : AL_FALSE);

    UnlockContext(Context);

    return result;
}

AL_API ALvoid AL_APIENTRY alAuxiliaryEffectSloti(ALuint effectslot, ALenum param, ALint iValue)
{
    ALCdevice *Device;
    ALCcontext *Context;
    ALeffectslot *EffectSlot;

    Context = GetLockedContext();
    if(!Context) return;

    Device = Context->Device;
    if((EffectSlot=LookupEffectSlot(Context->EffectSlotMap, effectslot)) != NULL)
    {
        switch(param)
        {
        case AL_EFFECTSLOT_EFFECT: {
            ALeffect *effect = NULL;

            if(iValue == 0 ||
               (effect=LookupEffect(Device->EffectMap, iValue)) != NULL)
            {
                InitializeEffect(Context, EffectSlot, effect);
                Context->UpdateSources = AL_TRUE;
            }
            else
                alSetError(Context, AL_INVALID_VALUE);
        }   break;

        case AL_EFFECTSLOT_AUXILIARY_SEND_AUTO:
            if(iValue == AL_TRUE || iValue == AL_FALSE)
            {
                EffectSlot->AuxSendAuto = iValue;
                Context->UpdateSources = AL_TRUE;
            }
            else
                alSetError(Context, AL_INVALID_VALUE);
            break;

        default:
            alSetError(Context, AL_INVALID_ENUM);
            break;
        }
    }
    else
        alSetError(Context, AL_INVALID_NAME);

    UnlockContext(Context);
}

AL_API ALvoid AL_APIENTRY alAuxiliaryEffectSlotiv(ALuint effectslot, ALenum param, ALint *piValues)
{
    ALCcontext *Context;

    switch(param)
    {
        case AL_EFFECTSLOT_EFFECT:
        case AL_EFFECTSLOT_AUXILIARY_SEND_AUTO:
            alAuxiliaryEffectSloti(effectslot, param, piValues[0]);
            return;
    }

    Context = GetLockedContext();
    if(!Context) return;

    if(LookupEffectSlot(Context->EffectSlotMap, effectslot) != NULL)
    {
        switch(param)
        {
        default:
            alSetError(Context, AL_INVALID_ENUM);
            break;
        }
    }
    else
        alSetError(Context, AL_INVALID_NAME);

    UnlockContext(Context);
}

AL_API ALvoid AL_APIENTRY alAuxiliaryEffectSlotf(ALuint effectslot, ALenum param, ALfloat flValue)
{
    ALCcontext *Context;
    ALeffectslot *EffectSlot;

    Context = GetLockedContext();
    if(!Context) return;

    if((EffectSlot=LookupEffectSlot(Context->EffectSlotMap, effectslot)) != NULL)
    {
        switch(param)
        {
        case AL_EFFECTSLOT_GAIN:
            if(flValue >= 0.0f && flValue <= 1.0f)
            {
                EffectSlot->Gain = flValue;
                EffectSlot->NeedsUpdate = AL_TRUE;
            }
            else
                alSetError(Context, AL_INVALID_VALUE);
            break;

        default:
            alSetError(Context, AL_INVALID_ENUM);
            break;
        }
    }
    else
        alSetError(Context, AL_INVALID_NAME);

    UnlockContext(Context);
}

AL_API ALvoid AL_APIENTRY alAuxiliaryEffectSlotfv(ALuint effectslot, ALenum param, ALfloat *pflValues)
{
    ALCcontext *Context;

    switch(param)
    {
        case AL_EFFECTSLOT_GAIN:
            alAuxiliaryEffectSlotf(effectslot, param, pflValues[0]);
            return;
    }

    Context = GetLockedContext();
    if(!Context) return;

    if(LookupEffectSlot(Context->EffectSlotMap, effectslot) != NULL)
    {
        switch(param)
        {
        default:
            alSetError(Context, AL_INVALID_ENUM);
            break;
        }
    }
    else
        alSetError(Context, AL_INVALID_NAME);

    UnlockContext(Context);
}

AL_API ALvoid AL_APIENTRY alGetAuxiliaryEffectSloti(ALuint effectslot, ALenum param, ALint *piValue)
{
    ALCcontext *Context;
    ALeffectslot *EffectSlot;

    Context = GetLockedContext();
    if(!Context) return;

    if((EffectSlot=LookupEffectSlot(Context->EffectSlotMap, effectslot)) != NULL)
    {
        switch(param)
        {
        case AL_EFFECTSLOT_EFFECT:
            *piValue = EffectSlot->effect.effect;
            break;

        case AL_EFFECTSLOT_AUXILIARY_SEND_AUTO:
            *piValue = EffectSlot->AuxSendAuto;
            break;

        default:
            alSetError(Context, AL_INVALID_ENUM);
            break;
        }
    }
    else
        alSetError(Context, AL_INVALID_NAME);

    UnlockContext(Context);
}

AL_API ALvoid AL_APIENTRY alGetAuxiliaryEffectSlotiv(ALuint effectslot, ALenum param, ALint *piValues)
{
    ALCcontext *Context;

    switch(param)
    {
        case AL_EFFECTSLOT_EFFECT:
        case AL_EFFECTSLOT_AUXILIARY_SEND_AUTO:
            alGetAuxiliaryEffectSloti(effectslot, param, piValues);
            return;
    }

    Context = GetLockedContext();
    if(!Context) return;

    if(LookupEffectSlot(Context->EffectSlotMap, effectslot) != NULL)
    {
        switch(param)
        {
        default:
            alSetError(Context, AL_INVALID_ENUM);
            break;
        }
    }
    else
        alSetError(Context, AL_INVALID_NAME);

    UnlockContext(Context);
}

AL_API ALvoid AL_APIENTRY alGetAuxiliaryEffectSlotf(ALuint effectslot, ALenum param, ALfloat *pflValue)
{
    ALCcontext *Context;
    ALeffectslot *EffectSlot;

    Context = GetLockedContext();
    if(!Context) return;

    if((EffectSlot=LookupEffectSlot(Context->EffectSlotMap, effectslot)) != NULL)
    {
        switch(param)
        {
        case AL_EFFECTSLOT_GAIN:
            *pflValue = EffectSlot->Gain;
            break;

        default:
            alSetError(Context, AL_INVALID_ENUM);
            break;
        }
    }
    else
        alSetError(Context, AL_INVALID_NAME);

    UnlockContext(Context);
}

AL_API ALvoid AL_APIENTRY alGetAuxiliaryEffectSlotfv(ALuint effectslot, ALenum param, ALfloat *pflValues)
{
    ALCcontext *Context;

    switch(param)
    {
        case AL_EFFECTSLOT_GAIN:
            alGetAuxiliaryEffectSlotf(effectslot, param, pflValues);
            return;
    }

    Context = GetLockedContext();
    if(!Context) return;

    if(LookupEffectSlot(Context->EffectSlotMap, effectslot) != NULL)
    {
        switch(param)
        {
        default:
            alSetError(Context, AL_INVALID_ENUM);
            break;
        }
    }
    else
        alSetError(Context, AL_INVALID_NAME);

    UnlockContext(Context);
}


static ALvoid NoneDestroy(ALeffectState *State)
{ free(State); }
static ALboolean NoneDeviceUpdate(ALeffectState *State, ALCdevice *Device)
{
    return AL_TRUE;
    (void)State;
    (void)Device;
}
static ALvoid NoneUpdate(ALeffectState *State, ALCcontext *Context, const ALeffectslot *Slot)
{
    (void)State;
    (void)Context;
    (void)Slot;
}
static ALvoid NoneProcess(ALeffectState *State, const ALeffectslot *Slot, ALuint SamplesToDo, const ALfloat *SamplesIn, ALfloat (*SamplesOut)[MAXCHANNELS])
{
    (void)State;
    (void)Slot;
    (void)SamplesToDo;
    (void)SamplesIn;
    (void)SamplesOut;
}
ALeffectState *NoneCreate(void)
{
    ALeffectState *state;

    state = calloc(1, sizeof(*state));
    if(!state)
        return NULL;

    state->Destroy = NoneDestroy;
    state->DeviceUpdate = NoneDeviceUpdate;
    state->Update = NoneUpdate;
    state->Process = NoneProcess;

    return state;
}

static ALvoid InitializeEffect(ALCcontext *Context, ALeffectslot *EffectSlot, ALeffect *effect)
{
    if(EffectSlot->effect.type != (effect?effect->type:AL_EFFECT_NULL))
    {
        ALeffectState *NewState = NULL;
        if(!effect || effect->type == AL_EFFECT_NULL)
            NewState = NoneCreate();
        else if(effect->type == AL_EFFECT_EAXREVERB)
            NewState = EAXVerbCreate();
        else if(effect->type == AL_EFFECT_REVERB)
            NewState = VerbCreate();
        else if(effect->type == AL_EFFECT_ECHO)
            NewState = EchoCreate();
        else if(effect->type == AL_EFFECT_RING_MODULATOR)
            NewState = ModulatorCreate();
        else if(effect->type == AL_EFFECT_DEDICATED_LOW_FREQUENCY_EFFECT)
            NewState = DedicatedLFECreate();
        else if(effect->type == AL_EFFECT_DEDICATED_DIALOGUE)
            NewState = DedicatedDLGCreate();
        /* No new state? An error occured.. */
        if(NewState == NULL ||
           ALEffect_DeviceUpdate(NewState, Context->Device) == AL_FALSE)
        {
            if(NewState)
                ALEffect_Destroy(NewState);
            alSetError(Context, AL_OUT_OF_MEMORY);
            return;
        }
        if(EffectSlot->EffectState)
            ALEffect_Destroy(EffectSlot->EffectState);
        EffectSlot->EffectState = NewState;

        if(!effect)
            memset(&EffectSlot->effect, 0, sizeof(EffectSlot->effect));
        else
            memcpy(&EffectSlot->effect, effect, sizeof(*effect));
        /* FIXME: This should be done asychronously, but since the EfefctState
         * object was changed, it needs an update before its Process method can
         * be called (coming changes may not guarantee an update when the
         * NeedsUpdate flag is set). */
        EffectSlot->NeedsUpdate = AL_FALSE;
        ALEffect_Update(EffectSlot->EffectState, Context, EffectSlot);
    }
    else
    {
        if(!effect)
            memset(&EffectSlot->effect, 0, sizeof(EffectSlot->effect));
        else
            memcpy(&EffectSlot->effect, effect, sizeof(*effect));
        EffectSlot->NeedsUpdate = AL_TRUE;
    }
}


ALvoid ReleaseALAuxiliaryEffectSlots(ALCcontext *Context)
{
    ALsizei pos;
    for(pos = 0;pos < Context->EffectSlotMap.size;pos++)
    {
        ALeffectslot *temp = Context->EffectSlotMap.array[pos].value;
        Context->EffectSlotMap.array[pos].value = NULL;

        // Release effectslot structure
        ALEffect_Destroy(temp->EffectState);

        FreeThunkEntry(temp->effectslot);
        memset(temp, 0, sizeof(ALeffectslot));
        free(temp);
    }
}