/************************************************************************************
Copyright : Copyright (c) Facebook Technologies, LLC and its affiliates. All rights reserved.

Your use of this SDK or tool is subject to the Oculus SDK License Agreement, available at
https://developer.oculus.com/licenses/oculussdk/

Unless required by applicable law or agreed to in writing, the Utilities SDK distributed
under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
ANY KIND, either express or implied. See the License for the specific language governing
permissions and limitations under the License.
************************************************************************************/

using System.Collections.Generic;
using UnityEngine;
using Random = UnityEngine.Random;
using UnityEngine.Assertions;
using Oculus.Interaction;

namespace Oculus.Interaction
{
    [RequireComponent(typeof(AudioSource))]
    public class AudioTrigger : MonoBehaviour
    {
        // Private
        private AudioSource _audioSource = null;
        private List<AudioClip> _randomAudioClipPool = new List<AudioClip>();
        private AudioClip _previousAudioClip = null;

        // Serialized
        [Tooltip("Audio clip arrays with a value greater than 1 will have randomized playback.")]
        [SerializeField]
        private AudioClip[] _audioClips;
        [Tooltip("Volume set here will override the volume set on the attached sound source component.")]
        [Range(0f, 1f)]
        [SerializeField]
        private float _volume = 0.7f;
        [Tooltip("Check the 'Use Random Range' bool to and adjust the min and max slider values for randomized volume level playback.")]
        [SerializeField]
        private MinMaxPair _volumeRandomization;
        [Tooltip("Pitch set here will override the volume set on the attached sound source component.")]
        [SerializeField]
        [Range(-3f,3f)]
        [Space(10)]
        private float _pitch = 1f;
        [Tooltip("Check the 'Use Random Range' bool to and adjust the min and max slider values for randomized volume level playback.")]
        [SerializeField]
        private MinMaxPair _pitchRandomization;
        [Tooltip("True by default. Set to false for sounds to bypass the spatializer plugin. Will override settings on attached audio source.")]
        [SerializeField]
        [Space(10)]
        private bool _spatialize = true;
        [Tooltip("False by default. Set to true to enable looping on this sound. Will override settings on attached audio source.")]
        [SerializeField]
        private bool _loop = false;
        [Tooltip("100% by default. Sets likelyhood sample will actually play when called")]
        [SerializeField]
        private float _chanceToPlay = 100;
        [Tooltip("If enabled, audio will play automatically when this gameobject is enabled")]
        [SerializeField]
        private bool _playOnStart = false;
        protected virtual void Start()
        {
            _audioSource = gameObject.GetComponent<AudioSource>();
            // Validate that we have audio to play
            Assert.IsTrue(_audioClips.Length > 0, "An AudioTrigger instance in the scene has no audio clips.");
            // Add all audio clips in the populated array into an audio clip list for randomization purposes
            for (int i = 0; i < _audioClips.Length; i++)
            {
                _randomAudioClipPool.Add(_audioClips[i]);
            }
            // Copy over values from the audio trigger to the audio source
            _audioSource.volume = _volume;
            _audioSource.pitch = _pitch;
            _audioSource.spatialize = _spatialize;
            _audioSource.loop = _loop;
            Random.InitState((int)Time.time);
            // Play audio on start if enabled
            if (_playOnStart)
            {
                PlayAudio();
            }
        }
        public void PlayAudio()
        {
            // Early out if our audio source is disabled
            if (!_audioSource.isActiveAndEnabled)
            {
                return;
            }
            // Check if random chance is set
            float pick = Random.Range(0.0f, 100.0f);
            if (_chanceToPlay < 100 && pick > _chanceToPlay)
            {
                return;
            }
            // Check if volume randomization is set
            if (_volumeRandomization.UseRandomRange == true)
            {
                _audioSource.volume = Random.Range(_volumeRandomization.Min, _volumeRandomization.Max);
            }
            // Check if pitch randomization is set
            if (_pitchRandomization.UseRandomRange == true)
            {
                _audioSource.pitch = Random.Range(_pitchRandomization.Min, _pitchRandomization.Max);
            }
            // If the audio trigger has one clip, play it. Otherwise play a random without repeat clip
            AudioClip clipToPlay = _audioClips.Length == 1 ? _audioClips[0] : RandomClipWithoutRepeat();
            _audioSource.clip = clipToPlay;
            // Play the audio
            _audioSource.Play();
        }

        /// <summary>
        /// Choose a random clip without repeating the last clip
        /// </summary>
        private AudioClip RandomClipWithoutRepeat()
        {
            int randomIndex = Random.Range(0, _randomAudioClipPool.Count);
            AudioClip randomClip = _randomAudioClipPool[randomIndex];
            _randomAudioClipPool.RemoveAt(randomIndex);
            if (_previousAudioClip != null) {
                _randomAudioClipPool.Add(_previousAudioClip);
            }
            _previousAudioClip = randomClip;
            return randomClip;
        }
    }
    [System.Serializable]
    public struct MinMaxPair
    {
        [SerializeField]
        private bool _useRandomRange;
        [SerializeField]
        private float _min;
        [SerializeField]
        private float _max;
        public bool UseRandomRange => _useRandomRange;
        public float Min => _min;
        public float Max => _max;
    }
}