using System;
using UnityEngine;
using UnityEngine.Experimental.Rendering;

namespace UnityEditor.Experimental.Rendering
{
    [DebugUIDrawer(typeof(DebugUI.Value))]
    public sealed class DebugUIDrawerValue : DebugUIDrawer
    {
        public override bool OnGUI(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.Value>(widget);
            var rect = PrepareControlRect();
            EditorGUI.LabelField(rect, CoreEditorUtils.GetContent(w.displayName), CoreEditorUtils.GetContent(w.GetValue().ToString()));
            return true;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.Button))]
    public sealed class DebugUIDrawerButton : DebugUIDrawer
    {
        public override bool OnGUI(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.Button>(widget);

            var rect = EditorGUI.IndentedRect(EditorGUILayout.GetControlRect());
            if (GUI.Button(rect, w.displayName, EditorStyles.miniButton))
            {
                if (w.action != null)
                    w.action();
            }

            return true;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.BoolField))]
    public sealed class DebugUIDrawerBoolField : DebugUIDrawer
    {
        public override bool OnGUI(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.BoolField>(widget);
            var s = Cast<DebugStateBool>(state);

            EditorGUI.BeginChangeCheck();

            var rect = PrepareControlRect();
            bool value = EditorGUI.Toggle(rect, CoreEditorUtils.GetContent(w.displayName), w.GetValue());

            if (EditorGUI.EndChangeCheck())
                Apply(w, s, value);

            return true;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.IntField))]
    public sealed class DebugUIDrawerIntField : DebugUIDrawer
    {
        public override bool OnGUI(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.IntField>(widget);
            var s = Cast<DebugStateInt>(state);

            EditorGUI.BeginChangeCheck();

            var rect = PrepareControlRect();
            int value = w.min != null && w.max != null
                ? EditorGUI.IntSlider(rect, CoreEditorUtils.GetContent(w.displayName), w.GetValue(), w.min(), w.max())
                : EditorGUI.IntField(rect, CoreEditorUtils.GetContent(w.displayName), w.GetValue());

            if (EditorGUI.EndChangeCheck())
                Apply(w, s, value);

            return true;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.UIntField))]
    public sealed class DebugUIDrawerUIntField : DebugUIDrawer
    {
        public override bool OnGUI(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.UIntField>(widget);
            var s = Cast<DebugStateUInt>(state);

            EditorGUI.BeginChangeCheck();

            // No UIntField so we need to max to 0 ourselves or the value will wrap around
            var rect = PrepareControlRect();
            int tmp = w.min != null && w.max != null
                ? EditorGUI.IntSlider(rect, CoreEditorUtils.GetContent(w.displayName), Mathf.Max(0, (int)w.GetValue()), Mathf.Max(0, (int)w.min()), Mathf.Max(0, (int)w.max()))
                : EditorGUI.IntField(rect, CoreEditorUtils.GetContent(w.displayName), Mathf.Max(0, (int)w.GetValue()));

            uint value = (uint)Mathf.Max(0, tmp);

            if (EditorGUI.EndChangeCheck())
                Apply(w, s, value);

            return true;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.FloatField))]
    public sealed class DebugUIDrawerFloatField : DebugUIDrawer
    {
        public override bool OnGUI(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.FloatField>(widget);
            var s = Cast<DebugStateFloat>(state);

            EditorGUI.BeginChangeCheck();

            var rect = PrepareControlRect();
            float value = w.min != null && w.max != null
                ? EditorGUI.Slider(rect, CoreEditorUtils.GetContent(w.displayName), w.GetValue(), w.min(), w.max())
                : EditorGUI.FloatField(rect, CoreEditorUtils.GetContent(w.displayName), w.GetValue());

            if (EditorGUI.EndChangeCheck())
                Apply(w, s, value);

            return true;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.EnumField))]
    public sealed class DebugUIDrawerEnumField : DebugUIDrawer
    {
        public override bool OnGUI(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.EnumField>(widget);
            var s = Cast<DebugStateInt>(state);

            EditorGUI.BeginChangeCheck();

            int value = w.GetValue();
            if (w.enumNames == null || w.enumValues == null)
            {
                EditorGUILayout.LabelField("Can't draw an empty enumeration.");
            }
            else
            {
                var rect = PrepareControlRect();

                int index = Array.IndexOf(w.enumValues, w.GetValue());

                // Fallback just in case, we may be handling sub/sectionned enums here
                if (index < 0)
                    value = w.enumValues[0];

                value = EditorGUI.IntPopup(rect, CoreEditorUtils.GetContent(w.displayName), value, w.enumNames, w.enumValues);
            }

            if (EditorGUI.EndChangeCheck())
                Apply(w, s, value);

            return true;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.Foldout))]
    public sealed class DebugUIDrawerFoldout : DebugUIDrawer
    {
        public override void Begin(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.Foldout>(widget);
            var s = Cast<DebugStateBool>(state);

            EditorGUI.BeginChangeCheck();

            bool value = EditorGUILayout.Foldout(w.GetValue(), CoreEditorUtils.GetContent(w.displayName), true);

            if (EditorGUI.EndChangeCheck())
                Apply(w, s, value);

            EditorGUI.indentLevel++;
        }

        public override bool OnGUI(DebugUI.Widget node, DebugState state)
        {
            var s = Cast<DebugStateBool>(state);
            return s.value;
        }

        public override void End(DebugUI.Widget node, DebugState state)
        {
            EditorGUI.indentLevel--;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.ColorField))]
    public sealed class DebugUIDrawerColorField : DebugUIDrawer
    {
        public override bool OnGUI(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.ColorField>(widget);
            var s = Cast<DebugStateColor>(state);

            EditorGUI.BeginChangeCheck();

            var rect = PrepareControlRect();
            var value = EditorGUI.ColorField(rect, CoreEditorUtils.GetContent(w.displayName), w.GetValue(), w.showPicker, w.showAlpha, w.hdr);

            if (EditorGUI.EndChangeCheck())
                Apply(w, s, value);

            return true;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.Vector2Field))]
    public sealed class DebugUIDrawerVector2Field : DebugUIDrawer
    {
        public override bool OnGUI(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.Vector2Field>(widget);
            var s = Cast<DebugStateVector2>(state);

            EditorGUI.BeginChangeCheck();

            var value = EditorGUILayout.Vector2Field(w.displayName, w.GetValue());

            if (EditorGUI.EndChangeCheck())
                Apply(w, s, value);

            return true;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.Vector3Field))]
    public sealed class DebugUIDrawerVector3Field : DebugUIDrawer
    {
        public override bool OnGUI(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.Vector3Field>(widget);
            var s = Cast<DebugStateVector3>(state);

            EditorGUI.BeginChangeCheck();

            var value = EditorGUILayout.Vector3Field(w.displayName, w.GetValue());

            if (EditorGUI.EndChangeCheck())
                Apply(w, s, value);

            return true;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.Vector4Field))]
    public sealed class DebugUIDrawerVector4Field : DebugUIDrawer
    {
        public override bool OnGUI(DebugUI.Widget widget, DebugState state)
        {
            var w = Cast<DebugUI.Vector4Field>(widget);
            var s = Cast<DebugStateVector4>(state);

            EditorGUI.BeginChangeCheck();

            var value = EditorGUILayout.Vector4Field(w.displayName, w.GetValue());

            if (EditorGUI.EndChangeCheck())
                Apply(w, s, value);

            return true;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.Container))]
    public sealed class DebugUIDrawerContainer : DebugUIDrawer
    {
        public override void Begin(DebugUI.Widget widget, DebugState state)
        {
            if (!string.IsNullOrEmpty(widget.displayName))
                EditorGUILayout.LabelField(widget.displayName, EditorStyles.boldLabel);

            EditorGUI.indentLevel++;
        }

        public override void End(DebugUI.Widget widget, DebugState state)
        {
            EditorGUI.indentLevel--;
        }
    }

    [DebugUIDrawer(typeof(DebugUI.HBox))]
    public sealed class DebugUIDrawerHBox : DebugUIDrawer
    {
        public override void Begin(DebugUI.Widget widget, DebugState state)
        {
            EditorGUILayout.BeginHorizontal();
        }

        public override void End(DebugUI.Widget widget, DebugState state)
        {
            EditorGUILayout.EndHorizontal();
        }
    }

    [DebugUIDrawer(typeof(DebugUI.VBox))]
    public sealed class DebugUIDrawerVBox : DebugUIDrawer
    {
        public override void Begin(DebugUI.Widget widget, DebugState state)
        {
            EditorGUILayout.BeginVertical();
        }

        public override void End(DebugUI.Widget widget, DebugState state)
        {
            EditorGUILayout.EndVertical();
        }
    }
}