using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;

public class CameraPosition : MonoBehaviour
{
    public Camera movingCamera;
    public string cameraLogFileName = "";
 
    // Get from LoggingManager
    private int ParticipantID;
    private string cameraLogPathFolder = "";
    
    private string cameraLogPath;

    private float time = 0f;

    private string[] buffer;
    private int index = 0;

    private void Start()
    {
        ParticipantID = gameObject.GetComponentInParent<LoggingManager>().ParticipantID;
        cameraLogPathFolder = gameObject.GetComponentInParent<LoggingManager>().LogPathFolder;

        cameraLogFileName = "log_" + ParticipantID + "_" + cameraLogFileName + ".csv";
        cameraLogPath = Path.Combine(cameraLogPathFolder, cameraLogFileName);

        using (FileStream stream = File.Open(cameraLogPath, FileMode.Create))
        {
            using (StreamWriter writer = new StreamWriter(stream))
            {
                writer.WriteLine(GetLogFileHeader());
                writer.Flush();
            }
        }
        Debug.Log("Created new Logfile " + cameraLogFileName);

        buffer = new string[1000];
    }

    private string GetLogFileHeader()
    {
        StringBuilder header = new StringBuilder("ParticipantID");
        header.Append(";Time");
        header.Append(";Position");
        header.Append(";Rotation");

        return header.ToString();
    }

    private void FixedUpdate()
    {
        if (movingCamera.enabled)
        {
            StringBuilder line = new StringBuilder();
            line.Append(ParticipantID);
            line.Append(";" + time);
            line.Append(";" + movingCamera.transform.position.ToString());
            line.Append(";" + movingCamera.transform.rotation.ToString());

            buffer[index++] = line.ToString();

            if (index > buffer.Length - 1)
                writeFromBuffer();
        }
        time += Time.deltaTime;
    }

    private void writeFromBuffer()
    {
        if (File.Exists(cameraLogPath))
        {
            try
            {
                using (StreamWriter writer = new StreamWriter(cameraLogPath, true))
                {
                    for (int i = 0; i < buffer.Length; i++)
                    {
                        if (buffer[i] != null)
                        {
                            writer.WriteLine(buffer[i]);
                            writer.Flush();
                        }
                    }
                    buffer = new string[1000];
                    index = 0;
                }
            }
            catch (Exception e)
            {
                throw new ApplicationException("Something went wrong by writing into a csv file: ", e);
            }
        }
    }

    private void OnApplicationQuit()
    {
        writeFromBuffer();
    }
}