using OpenBveApi.Runtime;

namespace OpenbveFcmbTrainPlugin
{
    internal static class SoundManager
    {
        /// <summary>An array storing the sound handles.</summary>
        private static SoundHandle[] Sounds;

        /// <summary>The callback function to play sounds.</summary>
        private static PlaySoundDelegate PlaySoundDelegate;

        /// <summary>The callback function to play sounds in a specific car.</summary>
        private static PlayCarSoundDelegate PlayCarSoundDelegate;

        /// <summary>The callback function to play sounds in specific cars.</summary>
        private static PlayMultipleCarSoundDelegate PlayMultipleCarSoundDelegate;

        /// <summary>Initializes the sound manager.</summary>
        /// <param name="numSounds">The number of sounds supported by the plugin.</param>
        /// <param name="soundDelegate">The delegate to play sounds.</param>
        /// <param name="carSoundDelegate">The delegate to play sounds in a specific car.</param>
        /// <param name="multipleCarSoundDelegate">The delegate to play sounds in specific cars.</param>
        internal static void Initialize(int numSounds, PlaySoundDelegate soundDelegate, PlayCarSoundDelegate carSoundDelegate, PlayMultipleCarSoundDelegate multipleCarSoundDelegate)
        {
            Sounds = new SoundHandle[numSounds];
            PlaySoundDelegate = soundDelegate;
            PlayCarSoundDelegate = carSoundDelegate;
            PlayMultipleCarSoundDelegate = multipleCarSoundDelegate;
        }

        /// <summary>Plays a sound.</summary>
        /// <param name="soundIndex">The index of the sound to be played.</param>
        /// <param name="volume">The volume of the sound to be played.</param>
        /// <param name="pitch">The pitch of the sound to be played.</param>
        /// <param name="looped">Whether the sound to be played is looped.</param>
        internal static void Play(int soundIndex, double volume, double pitch, bool looped)
        {
            // Validate index before doing anything
            if (soundIndex < Sounds.Length && soundIndex >= 0)
            {
                if (Playing(soundIndex))
                {
                    // The sound is still playing, update volume and pitch
                    Sounds[soundIndex].Volume = volume;
                    Sounds[soundIndex].Pitch = pitch;
                }
                else
                {
                    // The sound is not playing, play it now
                    Sounds[soundIndex] = PlaySoundDelegate(soundIndex, volume, pitch, looped);
                }
            }
        }

        /// <summary>Plays a sound.</summary>
        /// <param name="soundIndex">The index of the sound to be played.</param>
        /// <param name="volume">The volume of the sound to be played.</param>
        /// <param name="pitch">The pitch of the sound to be played.</param>
        /// <param name="looped">Whether the sound to be played is looped.</param>
        /// <param name="car">The index of the car where the sound will be played.</param>
        internal static void Play(int soundIndex, double volume, double pitch, bool looped, int car)
        {
            // Validate index before doing anything
            if (soundIndex < Sounds.Length && soundIndex >= 0)
            {
                if (Playing(soundIndex))
                {
                    // The sound is still playing, update volume and pitch
                    Sounds[soundIndex].Volume = volume;
                    Sounds[soundIndex].Pitch = pitch;
                }
                else
                {
                    // The sound is not playing, play it now
                    Sounds[soundIndex] = PlayCarSoundDelegate(soundIndex, volume, pitch, looped, car);
                }
            }
        }

        /// <summary>Stops a sound.</summary>
        /// <param name="soundIndex">The index of the sound to be stopped.</param>
        internal static void Stop(int soundIndex)
        {
            if (Playing(soundIndex))
            {
                // Stop sound
                Sounds[soundIndex].Stop();
            }
        }

        /// <summary>Whether a sound is playing.</summary>
        /// <param name="soundIndex">The index of the sound to check.</param>
        internal static bool Playing(int soundIndex)
        {
            // Validate index before doing anything
            if (soundIndex < Sounds.Length && soundIndex >= 0 && Sounds[soundIndex] != null)
            {
                if (Sounds[soundIndex].Playing)
                {
                    return true;
                }
            }
            return false;
        }
    }
}