/**
* Copyright (c) 2021 Vuplex Inc. All rights reserved.
*
* Licensed under the Vuplex Commercial Software Library License, you may
* not use this file except in compliance with the License. You may obtain
* a copy of the License at
*
*     https://vuplex.com/commercial-library-license
*
* 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.
*/
using System;
using UnityEngine;
using UnityEngine.UI;

namespace Vuplex.WebView
{

    /// <summary>
    /// Like the Keyboard component, except optimized for use in a Canvas.
    /// You can add a CanvasKeyboard to your scene by dragging CanvasKeyboard.prefab
    /// into a Canvas via the editor or by programmatically calling `CanvasKeyboard.Instantiate()`.
    /// For an example, please see the CanvasWorldSpaceDemo scene.
    /// </summary>
    /// <example>
    /// // Create a CanvasKeyboard.
    /// var keyboard = CanvasKeyboard.Instantiate();
    /// keyboard.transform.SetParent(canvas.transform, false);
    /// var rectTransform = keyboard.transform as RectTransform;
    /// rectTransform.anchoredPosition3D = Vector3.zero;
    /// rectTransform.offsetMin = Vector2.zero;
    /// rectTransform.offsetMax = Vector2.zero;
    /// rectTransform.sizeDelta = new Vector2(650, 162);
    /// // Hook up the keyboard so that characters are routed to a CanvasWebViewPrefab in the scene.
    /// keyboard.InputReceived += (sender, eventArgs) => {
    ///     canvasWebViewPrefab.WebView.HandleKeyboardInput(eventArgs.Value);
    /// };
    /// </example>
    public class CanvasKeyboard : BaseKeyboard
    {

        /// <summary>
        /// Sets the keyboard's initial resolution in pixels per Unity unit.
        /// You can change the resolution to make the keyboard's content appear larger or smaller.
        /// For more information on scaling web content, see
        /// [this support article](https://support.vuplex.com/articles/how-to-scale-web-content).
        /// </summary>
        [Label("Initial Resolution (px / Unity unit)")]
        [Tooltip("You can change this to make web content appear larger or smaller.")]
        public float InitialResolution = 1;

        /// <summary>
        /// The `CanvasWebViewPrefab` instance used for the keyboard UI.
        /// </summary>
        public CanvasWebViewPrefab WebViewPrefab
        {
            get
            {
                return (CanvasWebViewPrefab)_webViewPrefab;
            }
        }

        void _initCanvasKeyboard()
        {

            var canvasWebViewPrefab = gameObject.GetComponentInChildren<CanvasWebViewPrefab>();
            if (!canvasWebViewPrefab) return;
            _webViewPrefab = canvasWebViewPrefab;
            _webViewPrefab.transform.SetParent(transform, false);
            _webViewPrefab.gameObject.layer = gameObject.layer;
            var rectTransform = _webViewPrefab.transform as RectTransform;
            rectTransform.anchoredPosition3D = Vector3.zero;
            rectTransform.offsetMin = Vector2.zero;
            rectTransform.offsetMax = Vector2.zero;
            _webViewPrefab.transform.localScale = Vector3.one;
            canvasWebViewPrefab.InitialResolution = InitialResolution;
            _init();
            // Disable the image, which is just used as a placeholder in the editor.
            var image = GetComponent<Image>();
            if (image != null)
            {
                image.enabled = false;
            }
        }

        void Start()
        {

            _initCanvasKeyboard();
        }
    }
}