using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using UnityEngine.UI;

public class PlayerPreviewEditorBase : Editor
{
    protected virtual DShowPlayer player { get { return null; } }
    protected virtual DShowClip clip { get { return null; } }

    public override bool HasPreviewGUI()
    {
        return true;
    }
    public override bool RequiresConstantRepaint()
    {
        return player.IsPlaying;
    }
    public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();
    }
    public override void OnInteractivePreviewGUI(Rect r, GUIStyle background)
    {
        checkPlayer();
        player.updateTexture();
        DrawFrameSlider();
        if ((target as MonoBehaviour))
        {
            if ((target as MonoBehaviour).GetComponent<RawImage>() != null)
            {
                (target as MonoBehaviour).GetComponent<RawImage>().texture = player.Texture;
            }
            if ((target as MonoBehaviour).GetComponent<Image>() != null)
            {
                (target as MonoBehaviour).GetComponent<Image>().material.mainTexture = player.Texture;
            }
        }

        Texture texture = player.Texture;
        if (texture == null)
        {
            EditorGUILayout.HelpBox("texture is null, something whent wrong...", MessageType.Info);
        }
        else
        {
            float x, y, w, h;
            float tex_aspect = (float)texture.width / texture.height;
            float aspect = (float)r.width / r.height;
            if (tex_aspect > aspect)
            {
                w = r.width;
                h = w / tex_aspect;
            }
            else
            {
                h = r.height;
                w = h * tex_aspect;
            }
            x = 0.5f * (r.width - w);
            y = 0.5f * (r.height - h);

            r.x += x;
            r.y += y;
            r.width = w;
            r.height = h;

            r.y += r.height;
            r.height = -r.height;

            GUI.DrawTexture(r, texture);
        }
    }
    public override void OnPreviewSettings()
    {
        //DrawFrameSlider();
    }
    private void DrawFrameSlider()
    {


        EditorGUILayout.BeginHorizontal();
        GUIStyle previewButtonSettingsStyle = new GUIStyle("preButton");
        {

            var playButtonContent = EditorGUIUtility.IconContent("PlayButton");
            bool newPlaying = GUILayout.Toggle(player.IsPlaying, playButtonContent, previewButtonSettingsStyle, GUILayout.ExpandWidth(false));
            if (player.IsPlaying != newPlaying)
            {
                if (newPlaying)
                    player.Play();
                else
                    player.Pause();
                GUI.FocusControl(null);
            }
            
        }

        //EditorGUILayout.LabelField("Frame:");        
        
        var prev = EditorGUIUtility.IconContent("Animation.PrevKey");
        var next = EditorGUIUtility.IconContent("Animation.NextKey");
        if (GUILayout.Button(prev, previewButtonSettingsStyle, GUILayout.ExpandWidth(false)))
        {
            player.Frame--;
            GUI.FocusControl(null);
        }
        uint currentFrame = player.Frame;
        if (currentFrame != uint.MaxValue)
        {

            int newFrame = EditorGUILayout.IntSlider((int)currentFrame, 0, (int)player.TotalNumFrames, GUILayout.ExpandWidth(true));
            if (newFrame != currentFrame)
            {
                player.Frame = (uint)newFrame;
            }
            
        }
        if (GUILayout.Button(next, previewButtonSettingsStyle, GUILayout.ExpandWidth(false)))
        {
            player.Frame++;
            GUI.FocusControl(null);
        }
        EditorGUILayout.EndHorizontal();
    }
    private void checkPlayer()
    {
        if (player.IsLoaded == false || player.FilePath != clip.fullPath)
        {
            player.Load(clip);
            player.Play();
            player.Pause();
        }
    }
}