using UnityEditor;
using UnityEditor.AnimatedValues;
using UnityEngine;

namespace LeTai.Asset.TranslucentImage.Editor
{
[CustomEditor(typeof(ScalableBlurConfig))]
[CanEditMultipleObjects]
public class ScalableBlurConfigEditor : UnityEditor.Editor
{
    readonly GUIContent radiusLabel = new GUIContent(
        "Radius",
        "Blurriness. Does NOT affect performance"
    );

    readonly GUIContent iterationLabel = new GUIContent(
        "Iteration",
        "The number of times to run the algorithm to increase the smoothness of the effect. Can affect performance when increase"
    );

    readonly GUIContent depthLabel = new GUIContent(
        "Max Depth",
        "Decrease will reduce flickering, blurriness and performance"
    );

    readonly AnimBool useAdvancedControl = new AnimBool(false);

    int tab, previousTab;

    public void Awake()
    {
        LoadTabSelection();
        useAdvancedControl.value = tab > 0;
    }

    public void OnEnable()
    {
        // Without this editor will not Repaint automatically when animating
        useAdvancedControl.valueChanged.AddListener(Repaint);
    }

    public override void OnInspectorGUI()
    {
        ScalableBlurConfig config = (ScalableBlurConfig) target;

        Draw(config);
    }

    public void Draw(ScalableBlurConfig config)
    {
        Undo.RecordObject(target, "Modify Blur Config");

        using (var v = new EditorGUILayout.VerticalScope())
        {
            EditorGUILayout.Space();
            DrawTabBar();
            EditorGUILayout.Space();

            using (var changes = new EditorGUI.ChangeCheckScope())
            {
                DrawTabsContent(config);
                EditorGUILayout.Space();

                config.MaxDepth = EditorGUILayout.IntField(depthLabel, config.MaxDepth);
                EditorGUILayout.Space();

                if (changes.changed)
                {
                    EditorUtility.SetDirty(target);
                }
            }
        }
    }

    void DrawTabBar()
    {
        using (var h = new EditorGUILayout.HorizontalScope())
        {
            GUILayout.FlexibleSpace();

            tab = GUILayout.Toolbar(
                tab,
                new[] {"Simple", "Advanced"},
                GUILayout.MinWidth(0),
                GUILayout.MaxWidth(EditorGUIUtility.pixelsPerPoint * 192)
            );

            GUILayout.FlexibleSpace();
        }

        if (tab != previousTab)
        {
            GUI.FocusControl(""); // Defocus
            SaveTabSelection();
            previousTab = tab;
        }

        useAdvancedControl.target = tab == 1;
    }

    void DrawTabsContent(ScalableBlurConfig config)
    {
        //Simple tab
        if (EditorGUILayout.BeginFadeGroup(1 - useAdvancedControl.faded))
        {
            config.Strength = Mathf.Max(0, EditorGUILayout.FloatField("Strength", config.Strength));
        }

        EditorGUILayout.EndFadeGroup();

        //Advanced tab
        if (EditorGUILayout.BeginFadeGroup(useAdvancedControl.faded))
        {
            config.Radius    = EditorGUILayout.FloatField(radiusLabel, config.Radius);
            config.Iteration = EditorGUILayout.IntSlider(iterationLabel, config.Iteration, 0, 6);
        }

        EditorGUILayout.EndFadeGroup();
    }

    //Persist selected tab between sessions and instances
    void SaveTabSelection()
    {
        EditorPrefs.SetInt("LETAI_TRANSLUCENTIMAGE_TIS_TAB", tab);
    }

    void LoadTabSelection()
    {
        if (EditorPrefs.HasKey("LETAI_TRANSLUCENTIMAGE_TIS_TAB"))
            tab = EditorPrefs.GetInt("LETAI_TRANSLUCENTIMAGE_TIS_TAB");
    }
}
}