// Crest Ocean System

// Copyright 2020 Wave Harmonic Ltd

using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;
#if UNITY_EDITOR
using UnityEditor.SceneManagement;
#endif

namespace Crest.Examples
{
    public class PirateCoveDemo : MonoBehaviour
    {
        [SerializeField] bool _demoEnabled = true;
        [SerializeField] DemoShot[] _shots = null;
        [SerializeField] float _fadeToBlackTime = 2f;
        [SerializeField] float _solidBlackTime = 0.2f;
        [SerializeField] float _initialBlackHold = 1f;
        [SerializeField] bool _triggerNextShot = false;
        [SerializeField] bool _showEscPrompt = false;
        [SerializeField] string _environmentScene = "PirateCove-Environment";

        [Header("UI")]
        [SerializeField] GameObject _uiParent = null;
        [SerializeField] Text _captionUI = null;
        [SerializeField] Image _fadeToBlackImage = null;
        [SerializeField] GameObject _bottomPanel = null;

        Animation _anim;
        int _shotIndex = -1;
        float _clipStartTime = 0f;
        float _clipEndTime = 0f;

        OceanDebugGUI _debugGUI;
        bool _showGUI = false;
        bool _showTargets = false;

        CamController camController;
        bool _firstOnGUI = true;

        private void Awake()
        {
            if (enabled)
            {
                _fadeToBlackImage.enabled = true;
                _fadeToBlackImage.color = Color.black;

                _bottomPanel.SetActive(true);

                _debugGUI = FindObjectOfType<OceanDebugGUI>();
                if (_debugGUI)
                {
                    _showGUI = _debugGUI._guiVisible;
                    _showTargets = _debugGUI._showOceanData;
                    _debugGUI._guiVisible = false;
                    _debugGUI._showOceanData = false;
                }

                camController = GetComponent<CamController>();
                if (camController)
                {
                    camController.enabled = false;
                }
            }

            LoadEnvScene();
        }

        void LoadEnvScene()
        {
            for (int i = 0; i < SceneManager.sceneCount; i++)
            {
                var s = SceneManager.GetSceneAt(i);
                if (s.name == _environmentScene)
                {
                    return;
                }
            }

            var loadedLevel = SceneManager.GetSceneByName(_environmentScene);
            if (!loadedLevel.isLoaded)
            {
    #if UNITY_EDITOR
                var lsp = new LoadSceneParameters()
                {
                    loadSceneMode = LoadSceneMode.Additive,
                    localPhysicsMode = LocalPhysicsMode.Physics3D
                };
                EditorSceneManager.LoadSceneInPlayMode("Assets/Crest/Crest-Examples/PirateCove/Scenes/SubScenes/" + _environmentScene + ".unity", lsp);
    #else
                SceneManager.LoadScene(_environmentScene, LoadSceneMode.Additive);
    #endif
            }
        }

        private void Start()
        {
            _anim = GetComponent<Animation>();

            if (!_demoEnabled || _shots.Length == 0)
            {
                StopDemo();
                return;
            }

            DemoMusic.Instance?.Play();

            foreach (var shot in _shots)
            {
                if (shot._cameraAnimation != null)
                {
                    _anim.AddClip(shot._cameraAnimation, shot._cameraAnimation.name);
                }
            }
        }

        private void Update()
        {
            bool skip = Input.GetKeyDown(KeyCode.N) || _triggerNextShot;
            if ((!_anim.isPlaying && Time.time > _initialBlackHold) || skip)
            {
                _triggerNextShot = false;

                _fadeToBlackImage.CrossFadeAlpha(1f, 0f, true);

                PlayNextShot();
            }

            if (_clipEndTime != 0f && ShotTimeRemaining < (_fadeToBlackTime + _solidBlackTime))
            {
                _fadeToBlackImage.CrossFadeAlpha(1f, ShotTimeRemaining - _solidBlackTime, false);
                _clipEndTime = 0f;
            }

            if (Input.GetKeyDown(KeyCode.Escape))
            {
                StopDemo();
                return;
            }

            // Hide overlay UI
            if (Input.GetKeyDown(KeyCode.U))
            {
                _showEscPrompt = false;
                _bottomPanel.SetActive(false);
            }

            if (_shotIndex != -1)
            {
                _shots[_shotIndex].UpdateShot(ShotTime, ShotTimeRemaining);
            }
        }

        float ShotTime => Time.time - _clipStartTime;
        float ShotTimeRemaining => _clipEndTime - Time.time;

        private void PlayNextShot()
        {
            if (_shotIndex != -1)
            {
                _shots[_shotIndex].OnStop();
            }

            _shotIndex = (_shotIndex + 1) % _shots.Length;

            var shot = _shots[_shotIndex];

            if (shot._cameraAnimation != null)
            {
                _anim.Play(shot._cameraAnimation.name);
                _clipStartTime = Time.time;
                _clipEndTime = _clipStartTime + shot._cameraAnimation.length;
                _fadeToBlackImage.CrossFadeAlpha(0f, _fadeToBlackTime, false);
            }

            _captionUI.text = shot._demoText;

            shot.OnPlay();
        }

        private void StopDemo()
        {
            enabled = false;

            if (_anim)
            {
                _anim.Stop();
            }

            if (_shotIndex != -1)
            {
                _shots[_shotIndex].OnStop();
            }

            _captionUI.enabled = false;
            _fadeToBlackImage.CrossFadeAlpha(0f, _fadeToBlackTime, false);
            _uiParent.SetActive(false);

            if (camController) camController.enabled = true;

            if (_debugGUI)
            {
                _debugGUI._guiVisible = _showGUI;
                _debugGUI._showOceanData = _showTargets;
            }

            DemoMusic.Instance?.FadeOut();
        }

        private void OnGUI()
        {
            if (_firstOnGUI)
            {
                // Hacky way to force shaders to load early
                GUI.DrawTexture(new Rect(0, 0, 1, 1), Texture2D.blackTexture);
                GUI.DrawTexture(new Rect(0, 0, 1, 1), Texture2D.blackTexture, ScaleMode.ScaleAndCrop, false);
                GUI.Toggle(new Rect(0, 0, 30, 30), true, "Temp");
                _firstOnGUI = false;
            }

            if (_showEscPrompt)
            {
                GUI.Label(new Rect(10, 5, 250, 25), "[ESC]");
            }
        }
    }
}