/*
    AudioBijoux - A very simple OpenAL-based audio engine
    Created by MCL


    -------------------------------
    Copyright (c) 2021 MCL Software
    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

  ///////////////////////////////////////////////////////////////////////////////////////////////
 // WARNING: Likely contains bad programming practices, as this is my first time using OpenAL //
///////////////////////////////////////////////////////////////////////////////////////////////


#include <AL/al.h>
#include <AL/alc.h>
#include <stdlib.h>
#include <sndfile.h>
#include "Sound.h"

ALCdevice *device;
ALuint source;
ALuint musicSource;
ALuint buffer;
ALCcontext *context;

void checkForErrors()
{
    ALCenum error = alGetError();
    if (error != AL_NO_ERROR)
        printf("\nAudioBijoux: An error occurred!\n");
    else
        printf("\nAudioBijoux: OK\n");
}

void initAudioEngine()
{
    printf("\n---------------------------------\nAudioBijoux has been initialized!\n---------------------------------\n");

    // Open device
    device = alcOpenDevice(0);
    if(!device)
        printf("\nFailed to open device.\n");

    else
    {
        // Create context
        context = alcCreateContext(device, 0);

        if(!alcMakeContextCurrent(context))
        {
            // TODO: Add more specific error messages using alGetError()
            printf("\nFailed to make the context current.\n");
            checkForErrors();
        }
        else
        {
            // TODO: Define some other listener properties (i.e. position, orientation, etc.)

            // Create the sound effect source
            alGenSources((ALuint)1, &source);
            checkForErrors();

            alSourcef(source, AL_PITCH, 1);
            checkForErrors();

            alSourcef(source, AL_GAIN, 1);
            checkForErrors();

            alSource3f(source, AL_POSITION, 0, 0, 0);
            checkForErrors();

            alSource3f(source, AL_VELOCITY, 0, 0, 0);
            checkForErrors();

            // Create the music source

            alGenSources((ALuint)1, &musicSource);
            checkForErrors();

            alSourcef(musicSource, AL_PITCH, 1);
            checkForErrors();

            alSourcef(musicSource, AL_GAIN, 1);
            checkForErrors();

            alSource3f(musicSource, AL_POSITION, 0, 0, 0);
            checkForErrors();

            alSource3f(musicSource, AL_VELOCITY, 0, 0, 0);
            checkForErrors();


        }
    }
}

int stopAudioEngine()
{
    ALenum sourceState;
    alGetSourcei(source, AL_SOURCE_STATE, &sourceState);
    /*while(sourceState == AL_PLAYING)
    {
        alGetSourcei(source, AL_SOURCE_STATE, &sourceState);
    }*/

    alDeleteSources(1, &source);
    alDeleteSources(1, &musicSource);
    alDeleteBuffers(1, &buffer);
    device = alcGetContextsDevice(context);
    alcMakeContextCurrent(0);
    alcDestroyContext(context);
    alcCloseDevice(device);
}

ALuint playSound(int sourceToUse, int loop, ALuint buffer)
{
    if(sourceToUse)
    {
        alSourceStop(source); // Stop the sound that's currently playing

        alSourcei(source, AL_LOOPING, loop); // Make the sound looped / not looped
        alSourcei(source, AL_BUFFER, buffer); // Add buffer to source
        alSourcePlay(source); // Play the sound
    }
    else
    {
        alSourceStop(musicSource); // Stop the music that's currently playing.

        alSourcei(musicSource, AL_LOOPING, loop); // Make the sound looped / not looped
        alSourcei(musicSource, AL_BUFFER, buffer); // Add buffer to source
        alSourcePlay(musicSource); // Play the music
    }

}

ALuint loadSound(const char path[])
{
    ALenum format;
    SNDFILE *sndFile;
    SF_INFO sfInfo;
    short *memoryBuffer;
    sf_count_t numFrames;
    ALsizei numBytes;

    // Try to open and decode the passed file path
    sndFile = sf_open(path, SFM_READ, &sfInfo);
    if(!sndFile)
        printf("\nERROR: Couldn't open file %s\n", path);
    else
        printf("\nOK: File loaded successfully!");

    if(sfInfo.channels == 1)
    {
        printf("\nOK: File has 1 channel.\n");
        format = AL_FORMAT_MONO16; // One channel, 16-bits
    }
    else if(sfInfo.channels == 2)
    {
        printf("\nOK: File has 2 channels.\n");
        format = AL_FORMAT_STEREO16;
    }
    else
    {
        printf("\nERROR: Unknown # of channels.\n");
    }

    memoryBuffer = malloc((size_t)(sfInfo.frames * sfInfo.channels) * sizeof(short));

    numFrames = sf_readf_short(sndFile, memoryBuffer, sfInfo.frames);
    numBytes = (ALsizei)(numFrames * sfInfo.channels) * (ALsizei)sizeof(short);

    buffer = 0;

    alGenBuffers((ALuint)1, &buffer);
    alBufferData(buffer, format, memoryBuffer, numBytes, sfInfo.samplerate);


    checkForErrors();

    free(memoryBuffer);
    sf_close(sndFile);

    return buffer;
}