using System.Collections;
using System.IO;
using UnityEngine;

namespace RhythmTool.Examples
{
    /// <summary>
    /// The FileSelector shows a browser and imports a file, before analyzing and playing it.
    /// </summary>
    public class FileSelector : SongSelector
    {
        public Browser browser;

        public AudioImporter importer;

        private string cachePath;
        private string rhythmDataPath;

        void Awake()
        {
            cachePath = Path.Combine(Application.persistentDataPath, "RhythmData");

            if (!Directory.Exists(cachePath))
                Directory.CreateDirectory(cachePath);

            browser.FileSelected += OnFileSelected;
            importer.Loaded += OnLoaded;
        }

        private void OnFileSelected(string path)
        {
            //Hide the browser.
            browser.gameObject.SetActive(false);

            //Start importing the selected song.
            importer.Import(path);
        }

        private void OnLoaded(AudioClip audioClip)
        {
            //Clean up old resources.
            Destroy(player.audioClip);
            Destroy(player.rhythmData);

            //Assign AudioClip
            player.audioClip = audioClip;

            rhythmDataPath = Path.Combine(cachePath, audioClip.name + ".rthm");

            if (File.Exists(rhythmDataPath))
            {
                //If a file is found, load it and start playing the song.
                string json = File.ReadAllText(rhythmDataPath);
                RhythmData rhythmData = ScriptableObjectSerializer.FromJson<RhythmData>(json);

                player.rhythmData = rhythmData;

                StopAllCoroutines();
                StartCoroutine(PlayOnNextFrame());
            }
            else
            {
                //If no RhythmData file was found, analyze the song and save the results when the analysis is done.
                RhythmData rhythmData = analyzer.Analyze(audioClip);
                player.rhythmData = rhythmData;

                StopAllCoroutines();
                StartCoroutine(SaveRhythmData());
            }
        }

        public override void NextSong()
        {
            base.NextSong();

            //Show the browser.
            browser.gameObject.SetActive(true);
        }

        IEnumerator PlayOnNextFrame()
        {
            yield return null;
            player.Play();
        }

        IEnumerator SaveRhythmData()
        {
            while (!analyzer.isDone)
                yield return null;

            RhythmData rhythmData = analyzer.rhythmData;

            string json = ScriptableObjectSerializer.ToJson(rhythmData);
            File.WriteAllText(rhythmDataPath, json);
        }
    }
}