using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using UnityEditor;
using UnityEngine;
using UnityEngine.UI;

namespace VketCloudGUITools.Runtime
{
    [RequireComponent(typeof(Canvas))]
    [RequireComponent(typeof(CanvasScaler))]
    [System.Serializable]
    [DisallowMultipleComponent]
    public class VCCanvas : MonoBehaviour
    {
        public static readonly Vector2 CANVAS_SIZE_LANDSCAPE = new Vector2(1280, 720);
        public static readonly Vector2 CANVAS_SIZE_PORTRAIT = new Vector2(1280, 2276);

        #region Delegate
        public delegate void OnButtonPressedDelegate(VCButton button, List<GUIActionListItem> guiActionListItems);
        public delegate void OnSliderValueChangedDelegate(VCSlider slider, float value);
        #endregion

        public int Version;
        public CanvasType CanvasType;
        public int Z;

        public List<VCLayerList> layerList = new List<VCLayerList>();
        [HideInInspector]
        public List<TextAsset> Scripts = new List<TextAsset>();

        public event OnButtonPressedDelegate onButtonPress;
        public event OnSliderValueChangedDelegate onSliderValueChanged;

        public void ApplyValues()
        {
            var canvasScaler = this.GetComponent<CanvasScaler>();
            switch (this.CanvasType)
            {
                case CanvasType.None:
                    canvasScaler.uiScaleMode = CanvasScaler.ScaleMode.ConstantPixelSize;
                    break;
                case CanvasType.LandScape:
                    canvasScaler.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
                    canvasScaler.referenceResolution = CANVAS_SIZE_LANDSCAPE;
                    canvasScaler.matchWidthOrHeight = 0;
                    break;
                case CanvasType.Portrait:
                    canvasScaler.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
                    canvasScaler.referenceResolution = CANVAS_SIZE_PORTRAIT;
                    canvasScaler.matchWidthOrHeight = 1;
                    break;
            }
            this.transform.localPosition = new Vector3(transform.localPosition.x, transform.localPosition.y, 0 - Z);
        }

        [ContextMenu("Resolve References")]
        public void OnResolveReferences()
        {
            layerList = GetComponentsInChildren<VCLayerList>(includeInactive: true).ToList();

            foreach (var layer in layerList)
            {
                layer.OnResolveReferences(this);
            }
        }

        public void OnButtonPress(VCButton button, List<GUIActionListItem> guiActionListItems)
        {
            onButtonPress.Invoke(button, guiActionListItems);
        }

        public void OnSliderValueChanged(VCSlider slider, float value)
        {
            onSliderValueChanged.Invoke(slider, value);
        }
    }
}