using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using System.IO;
using UnityEngine.UI;
using UnityEngine.Networking;
using TMPro;
using RPGCreationKit;
using RPGCreationKit.SaveSystem;
using UnityEngine.EventSystems;
using UnityEngine.Events;

/// <summary>
/// Contains base information for a save system panel such as the load/save panels
/// </summary>
public class RckSaveSystemPanel : MonoBehaviour
{
	protected SaveGameButtonUI selectedSaveFile;
    [SerializeField] private GameObject EnvironmentManager;
	public SaveGameButtonUI SelectedSaveFile
	{
		get
		{
			return selectedSaveFile;
		}
		set
		{
			selectedSaveFile = value;

			OnSelectedSavegameChanges();
		}
	}

	public virtual void OnSelectedSavegameChanges()
	{

	}

}

namespace RPGCreationKit
{
	public class LoadPanel : RckSaveSystemPanel
	{
		// Load Game
		[SerializeField] private GameObject loadSavePanel;
		[SerializeField] private GameObject descriptionContent;

		[SerializeField] private Transform saveFilesT;
		[SerializeField] private GameObject savefileUIPrefab;

		[SerializeField] private List<Button> allButtons = new List<Button>();
		[SerializeField] private List<FileInfo> allSaveFiles = new List<FileInfo>();
		public Button selectedButton;
		[SerializeField] private Button loadButton;
		[SerializeField] private Button deleteButton;
		[SerializeField] private AudioSource MainAudioSource;

		//Textes
		[SerializeField] private GameObject screenshot;
		[SerializeField] private TextMeshProUGUI loadCharName;
		[SerializeField] private TextMeshProUGUI loadLevel;
		[SerializeField] private TextMeshProUGUI loadLocation;
		[SerializeField] private TextMeshProUGUI loadDate;
		[SerializeField] private TextMeshProUGUI loadSaveNumber;
		[SerializeField] private TextMeshProUGUI loadSaveVersion;

		[SerializeField] private GameObject deleteConfirmationGameobject;
		[SerializeField] private TextMeshProUGUI deleteConfirmationText;
		[SerializeField] private Button deleteDefaultButton;



		GameObject firstElementInList;
		bool ready;

		public UnityEvent OnPanelCloses;

		private void OnEnable()
		{
			ready = false;
			// Clear savegame
			foreach (Transform go in saveFilesT.transform)
				Destroy(go.gameObject);

			allSaveFiles.Clear();
			SelectedSaveFile = null;
			loadSavePanel.SetActive(true);
			DiscoverSaveFiles();
			SpawnSaveFilesUI();
			ready = true;
		}

		public void Update()
		{
			if (RckInput.isUsingGamepad)
			{
				if (RckInput.input.currentActionMap.FindAction("Back").triggered)
					ClosePanel();
			}
		}

		/// <summary>
		/// Scans Application.persistentDataPath to get all the savegames 
		/// </summary>
		[ContextMenu("Discover")]
		private void DiscoverSaveFiles()
		{
			if (!Directory.Exists(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments)+@"\My Games\Firstborn\Saves"))
				Directory.CreateDirectory(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments)+@"\My Games\Firstborn\Saves");

			// Get all files
			DirectoryInfo dir = new DirectoryInfo(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments)+@"\My Games\Firstborn\Saves");
			FileInfo[] info = dir.GetFiles("*.json*");

			foreach (FileInfo f in info)
				allSaveFiles.Add(f);

			allSaveFiles.Sort(SortByCreationDate);
		}

		/// <summary>
		/// Spawns the save games as buttons
		/// </summary>
		private void SpawnSaveFilesUI()
		{
			for (int i = 0; i < allSaveFiles.Count; i++)
			{
				GameObject SaveGame = Instantiate(savefileUIPrefab, saveFilesT);
				SaveGameButtonUI go = SaveGame.GetComponent<SaveGameButtonUI>();
				ButtonSounds BS = SaveGame.GetComponent<ButtonSounds>();
				BS.source = MainAudioSource;
				go.text.text = allSaveFiles[i].Name.Substring(0, allSaveFiles[i].Name.IndexOf('.'));
				go.panel = this;

				go.indexInList = i;
				go.LoadSaveFile(allSaveFiles[i]);
				go.isLoading = true;

				if (firstElementInList == null)
					firstElementInList = go.gameObject;

				allButtons.Add(go.GetComponent<Button>());
			}
		}

		public override void OnSelectedSavegameChanges()
		{
			if (selectedSaveFile == null)
			{
				loadButton.interactable = false;
				deleteButton.interactable = false;
				descriptionContent.SetActive(false);
			}
			else
			{
				loadButton.interactable = true;
				deleteButton.interactable = true;
				descriptionContent.SetActive(true);

				string screenPath = selectedSaveFile.fileInfo.FullName.Substring(0, selectedSaveFile.fileInfo.FullName.IndexOf('.'));
				screenPath += ".png";
                StartCoroutine(LoadCurrentImageX(screenPath));
//				screenshot.sprite = LoadSprite(screenPath);

				loadCharName.text = selectedSaveFile.saveFile.PlayerData.playerName;
				loadLevel.text = selectedSaveFile.saveFile.PlayerData.playerLevel.ToString();
				loadLocation.text = selectedSaveFile.saveFile.PlayerData.playerLocation;
				loadDate.text = selectedSaveFile.saveFile.SaveFileData.saveDate;
				loadSaveNumber.text = selectedSaveFile.saveFile.SaveFileData.saveNumber.ToString();
				loadSaveVersion.text = selectedSaveFile.saveFile.SaveFileData.fileVersion.ToString();
			}
		}

        IEnumerator LoadCurrentImageX(string imagePath) {
		    UnityWebRequest WWW = UnityWebRequestTexture.GetTexture(imagePath);
            yield return WWW.SendWebRequest();
            if (WWW.result != UnityWebRequest.Result.ConnectionError) {
                screenshot.GetComponent<RawImage> ().texture = DownloadHandlerTexture.GetContent(WWW);
                screenshot.GetComponent<RawImage> ().SetNativeSize();
                screenshot.GetComponent<RawImage> ().SizeToParent();
            }
            WWW.Dispose();
        }

		public void ConfirmLoadSave()
		{
			Time.timeScale = 1;

			if (selectedSaveFile != null)
				SaveSystemManager.instance.LoadSaveGame(selectedSaveFile.fileInfo, selectedSaveFile.saveFile);
		}

		public void ConfirmDeleteSaveGame()
		{
			if (selectedSaveFile != null)
			{
				DeleteSaveGame(selectedSaveFile);
				Destroy(selectedSaveFile.gameObject);

				if(RckInput.isUsingGamepad && allButtons.Count > 1 && allButtons[0] != null)
					allButtons[0].Select();

				SelectedSaveFile = null;
			}
		}

		public void DeleteSaveGame(SaveGameButtonUI _save)
		{
			string filePath = _save.fileInfo.FullName;

			if (File.Exists(filePath))
				File.Delete(filePath);

			string imagePath = filePath.Replace(".json", ".png");

			if (File.Exists(imagePath))
				File.Delete(imagePath);

			deleteConfirmationGameobject.SetActive(false);
		}

		public void ClosePanel()
		{
			loadSavePanel.SetActive(false);
			SelectedSaveFile = null;

			// Clear savegame
			foreach (Transform t in saveFilesT.transform)
				Destroy(t.gameObject);

			OnPanelCloses.Invoke();
		}

		public static int SortByCreationDate(FileInfo f1, FileInfo f2)
		{
			var d1 = File.GetLastWriteTime(f1.FullName);
			var d2 = File.GetLastWriteTime(f2.FullName);
			return System.DateTime.Compare(d2, d1);
		}


		/// <summary>
		/// Selects the first button that represents a savegame
		/// </summary>
		public void SelectFirstElementInList()
		{
			StartCoroutine(SelectFirstElementTask());
		}

		IEnumerator SelectFirstElementTask()
		{
			while (!ready)
				yield return null;

			if (firstElementInList != null)
				EventSystem.current.SetSelectedGameObject(firstElementInList);
		}

		public void DeleteButton()
		{
			selectedButton = selectedSaveFile.GetComponent<Button>();

			deleteConfirmationText.text = "Are you sure you want to delete the savegame: \n\n" + selectedSaveFile.fileInfo.Name.Replace(".json", "") + "?";
			deleteConfirmationGameobject.SetActive(true);

			deleteDefaultButton.Select();
			StartCoroutine(ConfirmationButtonSelectionTask());
		}

		IEnumerator ConfirmationButtonSelectionTask()
		{
			yield return new WaitForSeconds(1);
			deleteDefaultButton.Select();
		}

		public void CloseDeleteConfirmation()
		{
			deleteConfirmationGameobject.SetActive(false);
			selectedButton.Select();
		}
	}
}

static class CanvasExtensions {
	public static Vector2 SizeToParent(this RawImage image, float padding = 0) {
		float w = 0, h = 0;
		var parent = image.transform.parent.GetComponent<RectTransform>();
		var imageTransform = image.GetComponent<RectTransform>();
 
		// check if there is something to do
		if (image.texture != null) {
			if (!parent) { return imageTransform.sizeDelta; } //if we don't have a parent, just return our current width;
			padding = 1 - padding;
			float ratio = image.texture.width / (float)image.texture.height;
			var bounds = new Rect(0, 0, parent.rect.width, parent.rect.height);
			if (Mathf.RoundToInt(imageTransform.eulerAngles.z) % 180 == 90) {
				//Invert the bounds if the image is rotated
				bounds.size = new Vector2(bounds.height, bounds.width);
			}
			//Size by height first
			h = bounds.height * padding;
			w = h * ratio;
			if (w < bounds.width * padding) { //If it doesn't fit, fallback to width;
				w = bounds.width * padding;
				h = w / ratio;
			}
		}
		imageTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, w);
		imageTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, h);
		return imageTransform.sizeDelta;
	}
}