using System.Collections;
using System.Collections.Generic;
using UnityEngine;
namespace uc
{
    //https://developers.facebook.com/docs/graph-api/reference/page/photos/
    public class FBFanPagePhoto : MonoBehaviour
    {
        public Texture photo;
        public string message;
        public bool noStory = false;

        [Header("Settings")]
        [Range(1, 5)]
        public int downScaleRatio = 1;

        public WWWForm GetForm()
        {
            WWWForm form = new WWWForm();
            if (message != "")
                form.AddField("message", message);

            if (photo != null)
            {
                byte[] bytes = ProcessPhoto(photo);
                form.AddBinaryData("source", bytes, "screenShot.png", "image/png");
            }

            if(noStory)
                form.AddField("no_story", "true");

            return form;
        }

        byte[] ProcessPhoto(Texture tex)
        {
            try
            {
                if (downScaleRatio != 1 || (tex as Texture2D) == null)
                    return BlitPhoto(tex).EncodeToPNG();
                else
                    return (tex as Texture2D).EncodeToPNG();
            }
            catch (UnityException)
            {
                return BlitPhoto(tex).EncodeToPNG();
            }
        }

        Texture2D BlitPhoto(Texture tex)
        {
            RenderTexture temp = RenderTexture.GetTemporary(photo.width / downScaleRatio, photo.height / downScaleRatio, 0, RenderTextureFormat.ARGB32);
            Graphics.Blit(photo, temp);
            RenderTexture current = RenderTexture.active;
            RenderTexture.active = temp;
            Texture2D newTex = new Texture2D(temp.width, temp.height, TextureFormat.RGB24, false);
            newTex.ReadPixels(new Rect(0, 0, temp.width, temp.height), 0, 0);
            newTex.Apply();
            RenderTexture.active = current;

            return newTex;
        }
    }
}