using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using SiegeSong;
using UnityEngine.EventSystems;

namespace SiegeSong
{
    public class MenuManager : MonoBehaviour
    {
        public SaveFileLoader SaveFileLoader;

        public GameObject SavedGameListRowPrefab;

        public GameObject MenuContainer;
        public GameObject MenuHelpers;
        public GameObject PauseMenuOptions;
        public GameObject StartMenuOptions;
        public GameObject SettingsSubMenuOptions;

        public GameObject FileMenu;
        public GameObject FileListDisplay;
        public Text FileMetaDataDisplay;
        public Image FilePreviewImageDisplay;

        public MetaData[] SavedGames;
        
        public bool MenuActive = true;

        public Sprite DefaultImagePreview;

        public HintManager HintManager;

        public int SelectedIndex;
        public int SubMenuSelectedIndex;

        public bool SaveLoadSubmenuOpen;
        public bool SettingsSubmenuOpen;
        public bool SaveLoadSubmenuInSavingMode;

        public bool MenuOpening;

        private Color activeColor = Color.white;
        private Color inactiveColor = Color.grey;

        private int activeFontSize;
        private int inactiveFontSize;

        private bool saveLoadHasDelayed;

        private bool previous;

        private bool isInitializing;

        private bool startMenu = true;


        void Start()
        {
            isInitializing = true;
            HintManager.SetHint(HintArea.Center, "Loading Plugin Files...");
            var initializationResults = SaveFileLoader.InitializePlugins();
            if (initializationResults.Value == 0)
            {
                HintManager.SetHint(HintArea.Center, "Plugin Files Loaded Successfully.");
                isInitializing = false;
            }
            else
            {
                HintManager.SetHint(HintArea.Center, $"{initializationResults.Value} Plugin Files Failed to Load. {initializationResults.Key} Succeeded.");
                isInitializing = false;
            }
        }

        void LateUpdate()
        {
            if (!MenuActive && MenuOpening)
            {
                HintManager.SetHint(HintArea.MidLeft, "");
                HintManager.SetHint(HintArea.MidRight, "");
                HintManager.SetHint(HintArea.Center, "");
                HintManager.SetHint(HintArea.FarLeft, "Confirm Selection", InputButton.ActivateAccept);
                HintManager.SetHint(HintArea.FarRight, "Exit", InputButton.BackReject);
                StartCoroutine(SaveFileLoader.TakeTemporaryScreenCapture());
                MenuActive = true;
            }
        }

        void Update()
        {
            var menuOptions = startMenu ? StartMenuOptions : PauseMenuOptions;

            MenuHelpers.SetActive(MenuActive);
            FileMenu.SetActive(SaveLoadSubmenuOpen);

            if (MenuActive)
            {
                SaveFileLoader.RuntimeManager.InputManager.CurrentState = InputState.OutGameMenu;
                Time.timeScale = 0.0f;
                SaveFileLoader.RuntimeManager.DePopulateReferences();
                for (var i = 0; i < menuOptions.transform.childCount; i++)
                {
                    var childObject = menuOptions.transform.GetChild(i);
                    var childMenuOption = childObject.GetComponent<MenuOption>();
                    childMenuOption.Index = i;
                    childMenuOption.Text.color = SelectedIndex == i ? activeColor : inactiveColor;
                    childMenuOption.Background.color = SelectedIndex == i ? activeColor : inactiveColor;
                    childMenuOption.Text.fontSize = SelectedIndex == i ? activeFontSize : inactiveFontSize;
                }
            }
            else
            {
                StartMenuOptions.SetActive(false);
                PauseMenuOptions.SetActive(false);
            }
        }

        public void SelectPreviousIndex()
        {
            previous = true;
            SelectNextIndex();
        }

        public void SelectNextIndex()
        {
            var menuOptions = startMenu ? StartMenuOptions : PauseMenuOptions;

            if (previous)
            {
                previous = false;
                if (SaveLoadSubmenuOpen)
                {
                    if (SavedGames.Length + (SaveLoadSubmenuInSavingMode ? 1 : 0) > 0)
                    {
                        if (SubMenuSelectedIndex == (SaveLoadSubmenuOpen ? SavedGames.Length - 1 + (SaveLoadSubmenuInSavingMode ? 1 : 0) : SettingsSubMenuOptions.transform.childCount - 1))
                            SubMenuSelectedIndex = 0;
                        else
                            SubMenuSelectedIndex++;

                        UpdateSaveLoadMetaDataTextDisplay();
                        UpdateSaveLoadSubmenu();
                    }
                }
                else
                {
                    if (SelectedIndex == menuOptions.transform.childCount - 1)
                        SelectedIndex = 0;
                    else
                        SelectedIndex++;
                }
            }
            else 
            {
                if (SaveLoadSubmenuOpen)
                {
                    if (SavedGames.Length + (SaveLoadSubmenuInSavingMode ? 1 : 0) > 0)
                    {
                        if (SubMenuSelectedIndex == 0)
                            SubMenuSelectedIndex = SaveLoadSubmenuOpen ? SavedGames.Length - 1 + (SaveLoadSubmenuInSavingMode ? 1 : 0) : SettingsSubMenuOptions.transform.childCount - 1;
                        else
                            SubMenuSelectedIndex--;

                        UpdateSaveLoadMetaDataTextDisplay();
                        UpdateSaveLoadSubmenu();
                    }
                }
                else
                {
                    if (SelectedIndex == 0)
                        SelectedIndex = menuOptions.transform.childCount - 1;
                    else
                        SelectedIndex--;
                }
            }
        }

        public void ActivateSelectedOption()
        {
            if (isInitializing)
                return;

            if (!SaveLoadSubmenuOpen && !SettingsSubmenuOpen)
            {
                if (startMenu)
                {
                    switch (SelectedIndex)
                    {
                        case 0:
                            StartNewGame();
                            break;
                        case 1:
                            OpenLoadingSubmenu();
                            break;
                        case 3:
                            OpenSettingsSubmenu();
                            break;
                        case 4:
                            ExitGame();
                            break;
                    }
                }
                else
                {
                    switch (SelectedIndex)
                    {
                        case 0:
                            ResumeGame();
                            break;
                        case 1:
                            OpenSavingSubmenu();
                            break;
                        case 2:
                            OpenLoadingSubmenu();
                            break;
                        case 3:
                            OpenSettingsSubmenu();
                            break;
                        case 4:
                            ExitGame();
                            break;
                    }
                }
            }
            else if (SaveLoadSubmenuOpen)
            {
                if (SaveLoadSubmenuInSavingMode)
                    SaveGame();
                else
                    LoadGame();
                HintManager.SetHint(HintArea.FarLeft, "");
                HintManager.SetHint(HintArea.MidLeft, "");
                HintManager.SetHint(HintArea.Center, "");
                HintManager.SetHint(HintArea.MidRight, "");
                HintManager.SetHint(HintArea.FarRight, "");
            }
        }



        public void ResumeGame()
        {
            SaveFileLoader.RuntimeManager.PopulateReferences();
            startMenu = false;
            MenuActive = false;
            SaveLoadSubmenuOpen = false;
            SaveLoadSubmenuInSavingMode = false;
            SelectedIndex = 0;
            SubMenuSelectedIndex = 0;
            Time.timeScale = 1.0f;
        }
        public void LoadGame()
        {
            SaveFileLoader.ActiveSaveFileLocation = $"{Application.persistentDataPath.Replace("/", "\\")}\\{SaveFileLoader.DirectoryName}\\{SavedGames[SubMenuSelectedIndex].PlayerFullName.Replace(" ", "_")}_{SavedGames[SubMenuSelectedIndex].FileNameSuffix}";
            SaveFileLoader.LoadGameFile();
            ResumeGame();
            SaveFileLoader.RuntimeManager.PlayerActorInstance.GetComponentInChildren<NotificationManager>().Notify("Game Loaded!");
        }

        public void SaveGame()
        {
            if (SubMenuSelectedIndex == 0)
                SaveFileLoader.SaveGameFile();
            else
                SaveFileLoader.SaveGameFile($"{Application.persistentDataPath.Replace("/", "\\")}\\{SaveFileLoader.DirectoryName}\\{SavedGames[SubMenuSelectedIndex - 1].PlayerFullName.Replace(" ", "_")}_{SavedGames[SubMenuSelectedIndex - 1].FileNameSuffix}");

            ResumeGame();
            SaveFileLoader.RuntimeManager.PlayerActorInstance.GetComponentInChildren<NotificationManager>().Notify("Game Saved!");
            InitializeSaveLoadSubmenu();
        }

        public void UpdateSaveLoadMetaDataTextDisplay()
        {
            var selectedSavedGame = (!(SaveLoadSubmenuInSavingMode && SubMenuSelectedIndex == 0) && SubMenuSelectedIndex - (SaveLoadSubmenuInSavingMode ? 1 : 0) < SavedGames.Length && SubMenuSelectedIndex - (SaveLoadSubmenuInSavingMode ? 1 : 0) > -1) ? SavedGames[SubMenuSelectedIndex - (SaveLoadSubmenuInSavingMode ? 1 : 0)] : new MetaData();
            var filePath = $"{Application.persistentDataPath.Replace("/", "\\")}\\{SaveFileLoader.DirectoryName}\\{selectedSavedGame.PlayerFullName.Replace(" ", "_")}_{selectedSavedGame.FileNameSuffix}";
            if (!SaveLoadSubmenuInSavingMode)
                SaveFileLoader.ActiveSaveFileLocation = filePath;

            FileMetaDataDisplay.text = $"{selectedSavedGame.PlayerFullName}\n{selectedSavedGame.PlayerLevel}\n{selectedSavedGame.PlayerActiveQuestFriendlyName}\n{selectedSavedGame.InGameDate}\n{selectedSavedGame.LastPlayedOn}";

            if (System.IO.File.Exists($"{filePath}.png"))
            {
                var imagePreviewData = System.IO.File.ReadAllBytes($"{filePath}.png");
                var imagePreviewTexture = new Texture2D(selectedSavedGame.ScreenWidth, selectedSavedGame.ScreenHeight);
                imagePreviewTexture.filterMode = FilterMode.Trilinear;
                imagePreviewTexture.LoadImage(imagePreviewData);
                var imagePreviewSprite = Sprite.Create(imagePreviewTexture, new Rect(0, 0, selectedSavedGame.ScreenWidth, selectedSavedGame.ScreenHeight), new Vector2(0.5f, 0.0f), 1.0f);

                FilePreviewImageDisplay.sprite = imagePreviewSprite;
            }
            else
            {
                FilePreviewImageDisplay.sprite = DefaultImagePreview;
            }
        }

        public void StartNewGame()
        {
            startMenu = false;
            MenuActive = false;
            SaveLoadSubmenuOpen = false;
            SettingsSubmenuOpen = false;

            Time.timeScale = 1.0f;
            SaveFileLoader.RunNewGameSetup();
        }

        public void InitializeSaveLoadSubmenu()
        {
            SavedGames = SaveFileLoader.GetSaveFilesMetaData();
            UpdateSaveLoadSubmenu();
        }

        public void UpdateSaveLoadSubmenu()
        {
            for (var i = 0; i < FileListDisplay.transform.childCount; i++)
                if (FileListDisplay.transform.GetChild(i).gameObject.activeSelf)
                    Destroy(FileListDisplay.transform.GetChild(i).gameObject);
                else
                    FileListDisplay.transform.GetChild(i).gameObject.SetActive(false);

            for (var i = 0; i < SavedGames.Length + (SaveLoadSubmenuInSavingMode ? 1 : 0); i++)
            {
                var rowSizeBuffer = 4;
                var newRow = Instantiate(SavedGameListRowPrefab);
                var newRowMenuOption = newRow.GetComponent<MenuOption>();
                var newRowText = newRowMenuOption.Text;
                var newRowBackground = newRowMenuOption.Background;
                var newRowRect = newRow.GetComponent<RectTransform>();
                newRowMenuOption.InSubmenu = true;
                newRowMenuOption.Index = i;
                newRow.SetActive(true);

                if (SaveLoadSubmenuInSavingMode && i == 0)
                {
                    if (SubMenuSelectedIndex == 0)
                    {
                        newRowText.text = $"~ New Saved Game ~";
                        newRowText.color = activeColor;
                        newRowBackground.color = activeColor;
                    }
                    else
                    {
                        newRowText.text = $"New Saved Game";
                        newRowText.color = inactiveColor;
                        newRowBackground.color = inactiveColor;
                    }
                }
                else
                {
                    var savedGame = SavedGames[i - (SaveLoadSubmenuInSavingMode ? 1 : 0)];
                    if (i + (SaveLoadSubmenuInSavingMode ? 1 : 0) == SubMenuSelectedIndex + (SaveLoadSubmenuInSavingMode ? 1 : 0))
                    {
                        newRowText.text = $"~ {savedGame.Title.Replace("_", " ")} ~";
                        newRowText.color = activeColor;
                        newRowBackground.color = activeColor;
                    }
                    else
                    {
                        newRowText.text = $"{savedGame.Title.Replace("_", " ")}";
                        newRowText.color = inactiveColor;
                        newRowBackground.color = inactiveColor;
                    }
                }

                newRowRect.transform.parent = FileListDisplay.transform;
                newRowRect.transform.localScale = Vector3.one;

                newRowRect.position = new Vector2(0, (newRowText.fontSize + rowSizeBuffer) * -(i + 1 + (SaveLoadSubmenuInSavingMode ? 1 : 0)));
                newRowRect.offsetMin = new Vector2(00, (newRowText.fontSize + rowSizeBuffer) * -(i + 1 + (SaveLoadSubmenuInSavingMode ? 1 : 0)));
                newRowRect.offsetMax = new Vector2(0, (newRowText.fontSize + rowSizeBuffer) * -(i + (SaveLoadSubmenuInSavingMode ? 1 : 0)));
                newRowRect.sizeDelta = new Vector2(250, (newRowText.fontSize + rowSizeBuffer));
            }
            UpdateSaveLoadMetaDataTextDisplay();
        }

        public void OpenLoadingSubmenu()
        {
            SubMenuSelectedIndex = 0;
            SaveLoadSubmenuOpen = true;
            SaveLoadSubmenuInSavingMode = false;
            InitializeSaveLoadSubmenu();
        }

        public void OpenSavingSubmenu()
        {
            SubMenuSelectedIndex = 0;
            SaveLoadSubmenuOpen = true;
            SaveLoadSubmenuInSavingMode = true;
            InitializeSaveLoadSubmenu();
        }

        public void OpenSettingsSubmenu()
        {
            SubMenuSelectedIndex = 0;
            SettingsSubmenuOpen = true;
        }

        public void ExitGame()
        {
            if (startMenu)
                startMenu = false;
            else
                Application.Quit();
        }
    }
}