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

public class RenderPrintingManager : MonoBehaviour
{
    public static RenderPrintingManager Instance;
    public Vector2 renderPrintSize;

    public Transform pivot;

    public Camera renderCam;
    private RenderTexture rendtx;
    string dirPath = Path.Combine(Application.dataPath, "TestPic");

    private void Awake()
    {
        Instance = this;
        if (!Directory.Exists(dirPath))
        {
            Directory.CreateDirectory(dirPath);
        }
    }

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.K))
        {
            StartCoroutine(WaitSavePreview());
        }

        if (Input.GetKeyDown(KeyCode.L))
        {
            StartCoroutine(WaitSavePrinting());
        }
    }

    public void StartRenderPrinting()
    {
    }

    IEnumerator WaitSavePreview()
    {
        float smallerScale = Mathf.Max(renderPrintSize.x / 400f, renderPrintSize.y / 400f);
        rendtx = new RenderTexture((int)(renderPrintSize.x / smallerScale), (int)(renderPrintSize.y / smallerScale), 24,
            RenderTextureFormat.ARGB32);
        pivot.transform.localScale = Vector3.one / smallerScale;

        renderCam.targetTexture = rendtx;
        yield return null;
        Texture2D tex = ToTexture2D(rendtx);
        var bytes = tex.EncodeToPNG();
        File.WriteAllBytes(Path.Combine(dirPath, $"Preview - {DateTime.Now.Ticks}.png"), bytes);
        Debug.Log("Preview finish");
        rendtx.Release();
    }

    IEnumerator WaitSavePrinting()
    {
        pivot.transform.localScale = Vector3.one;
        Vector2 printSize = renderPrintSize;
        rendtx = new RenderTexture((int)printSize.x, (int)printSize.y, 24, RenderTextureFormat.ARGB32);
        renderCam.targetTexture = rendtx;
        yield return null;
        Texture2D print_tex = ToTexture2D(rendtx);
        string uploadTmp = SpecialSaveImageFile(print_tex, "printing");
        Debug.Log(uploadTmp);
    }

    public string SpecialSaveImageFile(Texture2D tex, string name)
    {
        byte[] bytes = tex.EncodeToPNG();


        if (!Directory.Exists(dirPath))
        {
            Directory.CreateDirectory(dirPath);
        }

        Debug.Log(dirPath);

        string filePath = Path.Combine(dirPath, $"printing-{DateTime.Now.Ticks}");
        File.WriteAllBytes(filePath + ".png", B83.Image.PNGTools.ChangePPI(bytes, 300, 300));

        string tmpPath = dirPath + DateTime.Now.ToString("yyyyMMHHmmss") + ".png";
        File.WriteAllBytes(tmpPath, B83.Image.PNGTools.ChangePPI(bytes, 300, 300));
        return tmpPath;
    }

    Texture2D ToTexture2D(RenderTexture rTex)
    {
        RenderTexture currentActiveRT = RenderTexture.active;
        Texture2D tex = new Texture2D(rTex.width, rTex.height, TextureFormat.ARGB32, false);
        RenderTexture.active = rTex;
        tex.ReadPixels(new Rect(0, 0, rTex.width, rTex.height), 0, 0);
        tex.Apply();
        RenderTexture.active = currentActiveRT;
        return tex;
    }
}