//-----------------------------------------------------------------------
// <copyright file="GvrLaserVisualEditor.cs" company="Google Inc.">
// Copyright 2017 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// </copyright>
//-----------------------------------------------------------------------

using System.Collections;
using UnityEditor;
using UnityEngine;

/// <summary>Custom editor for `GvrLaserVisual`.</summary>
/// <remarks>
/// Shows the relationship between the `shrinkLaser` property and other related properties.
/// </remarks>
[CustomEditor(typeof(GvrLaserVisual)), CanEditMultipleObjects]
public class GvrLaserVisualEditor : Editor
{
    /// <summary>The name of the **laser color** property.</summary>
    public const string LASER_COLOR_PROP_NAME = "laserColor";

    /// <summary>The name of the **laser color end** property.</summary>
    public const string LASER_COLOR_END_PROP_NAME = "laserColorEnd";

    /// <summary>The name of the **max laser distance** property.</summary>
    public const string MAX_LASER_DISTANCE_PROP_NAME = "maxLaserDistance";

    /// <summary>The name of the **shrink laser** property.</summary>
    public const string SHRINK_LASER_PROP_NAME = "shrinkLaser";

    /// <summary>The name of the **shrunk scale** property.</summary>
    public const string SHURNK_SCALE_PROP_NAME = "shrunkScale";

    /// <summary>The name of the **begin shrinking angle (degrees)** property.</summary>
    public const string BEGIN_SHRINKING_ANGLE_DEGREES_PROP_NAME = "beginShrinkAngleDegrees";

    /// <summary>The name of the **end shrinking angle (degrees)** property.</summary>
    public const string END_SHRINKING_ANGLE_DEGREES_PROP_NAME = "endShrinkAngleDegrees";

    /// <summary>The name of the **interpolation speed** property.</summary>
    public const string LERP_SPEED_PROP_NAME = "lerpSpeed";

    /// <summary>The name of the **interpolation threshold** property.</summary>
    public const string LERP_THRESHOLD_PROP_NAME = "lerpThreshold";

    /// <summary>The name of the **reticle** property.</summary>
    public const string RETICLE_PROP_NAME = "reticle";

    /// <summary>The name of the **controller** property.</summary>
    public const string CONTROLLER_PROP_NAME = "controller";

    private const string ITEM_PREFIX = "• ";

    private SerializedProperty laserColor;
    private SerializedProperty laserColorEnd;
    private SerializedProperty maxLaserDistance;
    private SerializedProperty shrinkLaser;
    private SerializedProperty shrunkScale;
    private SerializedProperty beginShrinkAngleDegrees;
    private SerializedProperty endShrinkAngleDegrees;
    private SerializedProperty lerpSpeed;
    private SerializedProperty lerpThreshold;
    private SerializedProperty reticle;
    private SerializedProperty controller;

    /// @cond
    /// <summary>A builtin method of the `Editor` class.</summary>
    /// <remarks>Implement this function to make a custom inspector.</remarks>
    public override void OnInspectorGUI()
    {
        serializedObject.Update();

        // Add clickable script field, as would have been provided by DrawDefaultInspector()
        MonoScript script = MonoScript.FromMonoBehaviour(target as MonoBehaviour);
        EditorGUI.BeginDisabledGroup(true);
        EditorGUILayout.ObjectField("Script", script, typeof(MonoScript), false);
        EditorGUI.EndDisabledGroup();

        // Show properties for the laser visual.
        EditorGUILayout.PropertyField(reticle);
        EditorGUILayout.PropertyField(controller);
        EditorGUILayout.PropertyField(laserColor);
        EditorGUILayout.PropertyField(laserColorEnd);
        EditorGUILayout.PropertyField(maxLaserDistance);
        EditorGUILayout.PropertyField(lerpSpeed);
        EditorGUILayout.PropertyField(lerpThreshold);
        EditorGUILayout.PropertyField(shrinkLaser);

        // Show properties for shrinking animation. Only enabled if shrinkLaser is enabled.
        if (!shrinkLaser.boolValue)
        {
            GUI.enabled = false;
        }

        EditorGUI.indentLevel++;
        Rect shrinkLaserRect = EditorGUILayout.BeginVertical();
        shrinkLaserRect = EditorGUI.IndentedRect(shrinkLaserRect);
        GUI.Box(shrinkLaserRect, "");
        EditorGUILayout.Space();

        EditorGUILayout.PropertyField(shrunkScale,
            new GUIContent(ITEM_PREFIX + shrunkScale.displayName));

        EditorGUILayout.PropertyField(beginShrinkAngleDegrees,
            new GUIContent(ITEM_PREFIX + beginShrinkAngleDegrees.displayName));

        EditorGUILayout.PropertyField(endShrinkAngleDegrees,
            new GUIContent(ITEM_PREFIX + endShrinkAngleDegrees.displayName));

        EditorGUILayout.Space();
        EditorGUILayout.EndVertical();
        EditorGUI.indentLevel--;

        if (!shrinkLaser.boolValue)
        {
            GUI.enabled = true;
        }

        EditorGUILayout.Space();

        serializedObject.ApplyModifiedProperties();
    }

    /// @endcond
    /// <summary>This MonoBehavior's OnEnable behavior.</summary>
    private void OnEnable()
    {
        laserColor = serializedObject.FindProperty(LASER_COLOR_PROP_NAME);
        laserColorEnd = serializedObject.FindProperty(LASER_COLOR_END_PROP_NAME);
        maxLaserDistance = serializedObject.FindProperty(MAX_LASER_DISTANCE_PROP_NAME);
        shrinkLaser = serializedObject.FindProperty(SHRINK_LASER_PROP_NAME);
        shrunkScale = serializedObject.FindProperty(SHURNK_SCALE_PROP_NAME);

        beginShrinkAngleDegrees = serializedObject.FindProperty(
            BEGIN_SHRINKING_ANGLE_DEGREES_PROP_NAME);

        endShrinkAngleDegrees = serializedObject.FindProperty(
            END_SHRINKING_ANGLE_DEGREES_PROP_NAME);

        lerpSpeed = serializedObject.FindProperty(LERP_SPEED_PROP_NAME);
        lerpThreshold = serializedObject.FindProperty(LERP_THRESHOLD_PROP_NAME);
        reticle = serializedObject.FindProperty(RETICLE_PROP_NAME);
        controller = serializedObject.FindProperty(CONTROLLER_PROP_NAME);
    }
}