using Assets.StreetLight.Scripts;
using System;
using System.Collections.Concurrent;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using UnityEngine;

namespace Assets
{
    public class CalibrationRecorderBehavior : MonoBehaviour
    {
        PersonManager PersonManager => personManagerLazy.Value;
        Lazy<PersonManager> personManagerLazy;
        string calibrationFileName;

        private void Awake()
        {
            personManagerLazy = new Lazy<PersonManager>(FindObjectOfType<PersonManager>);
        }

        BlockingCollection<Action> taskQueue;
        GameObject marker;

        void Start()
        {
            taskQueue = new BlockingCollection<Action>();

            calibrationFileName = Path.Combine(@".\CalibrationRecordings", $"CalibrationRecording{DateTime.Now:yyyy-MM-dd_HH-mm-ss}.csv");

            InitializeCalibrationFile();

            enabled = false;
            PersonManager.DetectionReady += PersonManager_DetectionReady;
            marker = GameObject.Find("CalibrationMarker");

            var markerBehavior = FindObjectOfType<CalibrationMarkerBehavior>();
            markerBehavior.PathFinished += MarkerBehavior_PathFinished;
        }

        private void InitializeCalibrationFile()
        {
            var directoryPath = Path.GetDirectoryName(calibrationFileName);
            if (!Directory.Exists(directoryPath))
            {
                Directory.CreateDirectory(directoryPath);
            }

            if (!File.Exists(calibrationFileName))
            {
                File.WriteAllText(calibrationFileName, string.Empty);
            }
        }

        private void AppendNewCalibrationPoint(float worldX, float worldY, float unityX, float unityY)
        {
            var valuesToWrite = new float[] { worldX, worldY, unityX, unityY }.Select(f => f.ToString("0." + new string('#', 50), CultureInfo.InvariantCulture));
            var line = string.Join(" ", valuesToWrite);

            taskQueue.Add(() => File.AppendAllLines(calibrationFileName, new string[] { line }));
            Task.Run(() => taskQueue.Take().Invoke());

        }

        private void MarkerBehavior_PathFinished(object sender, EventArgs e)
        {
            enabled = false;
            taskQueue.Add(() => Application.Quit());
            Task.Run(() => taskQueue.Take().Invoke());
        }

        private void PersonManager_DetectionReady(object sender, EventArgs e)
        {
            enabled = true;
        }

        void Update()
        {
            if (PersonManager.Persons.Count == 1)
            {
                var person = PersonManager.Persons.Single();

                var personPosition = person.WorldPosition;
                var markerPosition = marker.transform.position;

                AppendNewCalibrationPoint(personPosition.x, personPosition.z, markerPosition.x, markerPosition.z);
            }
        }
    }
}