using System;
using TriLibCore.General;
using TriLibCore.Utils;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;

namespace TriLibCore.Samples
{
    /// <summary>Represents a base class used in TriLib samples.</summary>
    public class AssetViewerBase : MonoBehaviour
    {
        /// <summary>Gets the Asset Viewer Singleton instance.</summary>
        public static AssetViewerBase Instance { get; private set; }

        /// <summary>
        /// Model/skybox loading bar. (Used on platforms with async capabilities)
        /// </summary>
        [SerializeField]
        private RectTransform _loadingBar;

        /// <summary>
        /// Help box wrapper.
        /// </summary>
        [SerializeField]
        private GameObject _helpWrapper;

        /// <summary>
        /// Loading screen wrapper. (Used on platforms without async capabilities)
        /// </summary>
        [SerializeField]
        private GameObject _loadingWrapper;

        /// <summary>
        /// Model URL loading dialog.
        /// </summary>
        [SerializeField]
        private GameObject _modelUrlDialog;

        /// <summary>
        ///  Model URL loading Input Field.
        /// </summary>
        [SerializeField]
        private InputField _modelUrl;

        /// <summary>
        /// Animation playback slider.
        /// </summary>
        [SerializeField]
        protected Slider PlaybackSlider;

        /// <summary>
        /// Animation playback time.
        /// </summary>
        [SerializeField]
        protected Text PlaybackTime;

        /// <summary>
        /// Animation selector.
        /// </summary>
        [SerializeField]
        protected Dropdown PlaybackAnimation;

        /// <summary>
        /// Play button.
        /// </summary>
        [SerializeField]
        protected Selectable Play;

        /// <summary>
        /// Stop button.
        /// </summary>
        [SerializeField]
        protected Selectable Stop;

        /// <summary>
        /// Options used in this sample.
        /// </summary>
        protected AssetLoaderOptions AssetLoaderOptions;

        /// <summary>
        /// Current camera pitch and yaw angles.
        /// </summary>
        public Vector2 CameraAngle;

        /// <summary>
        /// Loaded game object.
        /// </summary>
        public GameObject RootGameObject { get; protected set; }

        /// <summary>
        /// Mouse input multiplier.
        /// Higher values will make the mouse movement more sensible.
        /// </summary>
        protected const float InputMultiplierRatio = 0.1f;

        /// <summary>
        /// Maximum camera pitch and light pitch (rotation around local X-axis).
        /// </summary>
        protected const float MaxPitch = 80f;

        /// <summary>Updates the Camera based on mouse Input.</summary>
        protected void UpdateCamera()
        {
            CameraAngle.x = Mathf.Repeat(CameraAngle.x + Input.GetAxis("Mouse X"), 360f);
            CameraAngle.y = Mathf.Clamp(CameraAngle.y + Input.GetAxis("Mouse Y"), -MaxPitch, MaxPitch);
        }

        /// <summary>
        /// Shows the help box.
        /// </summary>
        public void ShowHelp()
        {
            _helpWrapper.SetActive(true);
        }

        /// <summary>
        /// Hides the help box.
        /// </summary>
        public void HideHelp()
        {
            _helpWrapper.SetActive(false);
        }

        /// <summary>
        /// Shows the model URL dialog.
        /// </summary>
        public void ShowModelUrlDialog()
        {
            _modelUrlDialog.SetActive(true);
            _modelUrl.Select();
            _modelUrl.ActivateInputField();
        }

        /// <summary>
        /// Hides the model URL dialog.
        /// </summary>
        public void HideModelUrlDialog()
        {
            _modelUrlDialog.SetActive(false);
            _modelUrl.text = null;
        }

        /// <summary>
        /// Shows the file picker for loading a model from local file-system.
        /// </summary>
        protected void LoadModelFromFile(GameObject wrapperGameObject = null, Action<AssetLoaderContext> onMaterialsLoad = null)
        {
            SetLoading(false);
            var filePickerAssetLoader = AssetLoaderFilePicker.Create();
            filePickerAssetLoader.LoadModelFromFilePickerAsync("Select a File", OnLoad, onMaterialsLoad ?? OnMaterialsLoad, OnProgress, OnBeginLoadModel, OnError, wrapperGameObject ?? gameObject, AssetLoaderOptions);
        }

        /// <summary>Loads a model from a URL.</summary>
        protected void LoadModelFromURL(UnityWebRequest request, string fileExtension, GameObject wrapperGameObject = null, object customData = null, Action<AssetLoaderContext> onMaterialsLoad = null)
        {
            HideModelUrlDialog();
            SetLoading(true);
            OnBeginLoadModel(true);
            var isZipFile = fileExtension == "zip";
            AssetDownloader.LoadModelFromUri(request, OnLoad, onMaterialsLoad ?? OnMaterialsLoad, OnProgress, OnError, wrapperGameObject, AssetLoaderOptions, customData, isZipFile ? null : fileExtension, isZipFile);
        }

        /// <summary>
        /// Shows the URL selector for loading a model from network.
        /// </summary>
        public void LoadModelFromURLWithDialogValues()
        {
            if (string.IsNullOrWhiteSpace(_modelUrl.text))
            {
                return;
            }
            var request = AssetDownloader.CreateWebRequest(_modelUrl.text);
            var fileExtension = FileUtils.GetFileExtension(request.uri.Segments[request.uri.Segments.Length - 1], false);
            LoadModelFromURL(request, fileExtension);
        }

        /// <summary>Event triggered when the user selects a file or cancels the Model selection dialog.</summary>
        /// <param name="hasFiles">If any file has been selected, this value is <c>true</c>, otherwise it is <c>false</c>.</param>
        protected virtual void OnBeginLoadModel(bool hasFiles)
        {
            if (hasFiles)
            {
                if (RootGameObject != null)
                {
                    Destroy(RootGameObject);
                }
                SetLoading(true);
            }
        }

        /// <summary>
        /// Enables/disables the loading flag.
        /// </summary>
        /// <param name="value">The new loading flag.</param>
        protected void SetLoading(bool value)
        {
            var selectables = FindObjectsOfType<Selectable>();
            foreach (var button in selectables)
            {
                button.interactable = !value;
            }
#if UNITY_WSA || UNITY_WEBGL
            _loadingWrapper.gameObject.SetActive(value);
#else
            _loadingBar.gameObject.SetActive(value);
#endif
        }

        /// <summary>Checks if the Dispatcher instance exists and stores this class instance as the Singleton.</summary>
        protected virtual void Start()
        {
            Dispatcher.CheckInstance();
            PasteManager.CheckInstance();
            Instance = this;
        }

        /// <summary>Event is triggered when the Model loading progress changes.</summary>
        /// <param name="assetLoaderContext">The Asset Loader Context reference. Asset Loader Context contains the information used during the Model loading process, which is available to almost every Model processing method</param>
        /// <param name="value">The loading progress, ranging from 0 to 1.</param>
        protected virtual void OnProgress(AssetLoaderContext assetLoaderContext, float value)
        {
            _loadingBar.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, Screen.width * value);
        }

        /// <summary>Event is triggered when any error occurs.</summary>
        /// <param name="contextualizedError">The Contextualized Error that has occurred.</param>
        protected virtual void OnError(IContextualizedError contextualizedError)
        {
            Debug.LogError(contextualizedError);
            RootGameObject = null;
            SetLoading(false);
        }

        /// <summary>Event is triggered when the Model Meshes and hierarchy are loaded.</summary>
        /// <param name="assetLoaderContext">The Asset Loader Context reference. Asset Loader Context contains the information used during the Model loading process, which is available to almost every Model processing method</param>
        protected virtual void OnLoad(AssetLoaderContext assetLoaderContext)
        {

        }

        /// <summary>Event is triggered when the Model (including Textures and Materials) has been fully loaded.</summary>
        /// <param name="assetLoaderContext">The Asset Loader Context reference. Asset Loader Context contains the information used during the Model loading process, which is available to almost every Model processing method</param>
        protected virtual void OnMaterialsLoad(AssetLoaderContext assetLoaderContext)
        {
            SetLoading(false);
        }

        /// <summary>
        /// Plays the selected animation.
        /// </summary>
        public virtual void PlayAnimation()
        {
        }

        /// <summary>Stops playing the selected animation.</summary>
        public virtual void StopAnimation()
        {
        }

        /// <summary>Switches to the animation selected on the Dropdown.</summary>
        /// <param name="index">The selected Animation index.</param>
        public virtual void PlaybackAnimationChanged(int index)
        {

        }

        /// <summary>
        /// Event triggered when the animation slider value has been changed by the user.
        /// </summary>
        /// <param name="value">The Animation playback normalized position.</param>
        public virtual void PlaybackSliderChanged(float value)
        {

        }
    }
}