using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using TMPro;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.UI;

namespace BulletHellTemplate
{
    public class UIRankingMenu : MonoBehaviour
    {
        [Header("Prefabs and Containers")]
        [Tooltip("Prefab for each ranking entry.")]
        public RankingEntry rankingEntryPrefab;

        [Tooltip("Container for ranking entries.")]
        public Transform container;

        [Tooltip("Container for displaying the favorite character.")]
        public Transform characterFavouriteContainer;

        [Header("Selected Player UI Elements")]
        [Tooltip("Text displaying the selected player's nickname.")]
        public TextMeshProUGUI selectedPlayerNickname;

        [Tooltip("Text displaying the selected player's rank.")]
        public TextMeshProUGUI selectedPlayerRank;

        [Tooltip("Image displaying the selected player's icon.")]
        public Image selectedPlayerIcon;

        [Tooltip("Image displaying the selected player's frame.")]
        public Image selectedPlayerFrame;

        [Header("Other UI Elements")]
        [Tooltip("Text displaying the current player's rank.")]
        public TextMeshProUGUI myRank;

        public TextMeshProUGUI localPlayerName;
        public Image localPlayerIcon;
        public Image localPlayerFrame;

        [Tooltip("Button to refresh the rankings.")]
        public Button refreshButton;

        [Tooltip("Image used to display cooldown on the refresh button.")]
        public Image cooldownImage;

        [Header("UI Translates Messages")]
        public string yourRank = "Your Rank: {0}";
        public NameTranslatedByLanguage[] yourRankTranslated;

        public string rankNotAvaliable = "Rank not available";
        public NameTranslatedByLanguage[] rankNotAvaliableTranslated;

        public string rank = "Rank:";
        public NameTranslatedByLanguage[] rankTranslated;

       [Header("Events")]
        [Tooltip("Event invoked when the menu is opened.")]
        public UnityEvent OnOpenMenu;

        [Tooltip("Event invoked when the menu is closed.")]
        public UnityEvent OnCloseMenu;


        public static UIRankingMenu Singleton;

        private bool isCooldownActive = false;
        private float cooldownTime = 5f;
        private string currentLang;
        private int localRanking;
        /// <summary>
        /// List of all instantiated ranking entries.
        /// </summary>
        private List<RankingEntry> rankingEntries = new List<RankingEntry>();

        private void Awake()
        {
            if (Singleton == null)
            {
                Singleton = this;
            }
            else
            {
                Destroy(gameObject);
            }
            LoadRankings();
        }
       
        /// <summary>
        /// Called when the object becomes enabled and active.
        /// Selects the first ranking entry once everything is loaded.
        /// </summary>
        private void OnEnable()
        {
            OnOpenMenu.Invoke();
            currentLang = LanguageManager.LanguageManager.Instance.GetCurrentLanguage();
            if (rankingEntries.Count > 0)
            {
                OnRankingEntrySelected(rankingEntries[0]);
            }
            LoadLocalPlayerInfo();
        }

        private void OnDisable()
        {
            OnCloseMenu.Invoke();            
        }
      
        /// <summary>
        /// Resets the cooldown for the refresh button.
        /// </summary>
        public void ResetCooldown()
        {
            StartCoroutine(StartCooldown());
        }

        /// <summary>
        /// Loads the rankings and displays the top players, sorted by score in descending order.
        /// </summary>
        public async void LoadRankings()
        {
            if (isCooldownActive) return;

            StartCoroutine(StartCooldown());

            List<Dictionary<string, object>> topPlayers = await BackendManager.Singleton.GetTopPlayersAsync();

            // Sort players by score in descending order
            var sortedPlayers = topPlayers
                .Select(playerData =>
                {
                    string scoreStr = playerData.ContainsKey("score") ? playerData["score"].ToString() : "0";
                    long.TryParse(scoreStr, out long score); // Convert score to long
                    string playerName = playerData.ContainsKey("PlayerName") ? playerData["PlayerName"].ToString() : "Unknown";

                    return new
                    {
                        PlayerData = playerData,
                        Score = score,
                        PlayerName = playerName
                    };
                })
                .OrderByDescending(p => p.Score) // Sort by score descending
                .ToList();

            // Clear existing entries
            foreach (Transform child in container)
            {
                Destroy(child.gameObject);
            }
            rankingEntries.Clear();

            // Populate the ranking list
            for (int i = 0; i < sortedPlayers.Count; i++)
            {
                var playerInfo = sortedPlayers[i];
                Dictionary<string, object> playerData = playerInfo.PlayerData;
                RankingEntry entry = Instantiate(rankingEntryPrefab, container);

                // Retrieve player data with error handling for missing information
                string playerName = playerInfo.PlayerName;
                string score = playerInfo.Score.ToString();
                string playerIconId = playerData.ContainsKey("PlayerIcon") ? playerData["PlayerIcon"].ToString() : "defaultIconId";
                string playerFrameId = playerData.ContainsKey("PlayerFrame") ? playerData["PlayerFrame"].ToString() : "defaultFrameId";

                // Convert PlayerCharacterFavourite to int
                int playerCharacterFavourite = playerData.ContainsKey("PlayerCharacterFavourite") ? int.Parse(playerData["PlayerCharacterFavourite"].ToString()) : 0;

                // Set ranking information
                entry.SetRankingInfo(
                    _playerName: playerName,
                    _score: score,
                    rankingPosition: i + 1,
                    playerIconId: GetPlayerIcon(playerIconId),
                    playerFrameId: GetPlayerFrame(playerFrameId),
                    playerCharacterFavourite: playerCharacterFavourite
                );

                // Add entry to the list
                rankingEntries.Add(entry);
            }

            // Get and display the current player's rank
            localRanking = await BackendManager.Singleton.GetPlayerRankAsync();
            
            if (rankingEntries.Count > 0)
            {
                OnRankingEntrySelected(rankingEntries[0]);
            }
        }

        public void LoadLocalPlayerInfo()
        {
            string _playerName = PlayerSave.GetPlayerName();
            string _playerIcon = PlayerSave.GetPlayerIcon();
            string _playerFrame = PlayerSave.GetPlayerFrame();

            localPlayerName.text = _playerName;
            localPlayerIcon.sprite = GetPlayerIcon(_playerIcon);
            localPlayerFrame.sprite = GetPlayerFrame(_playerFrame);

            string _yourRankTranslated = GetTranslatedString(yourRankTranslated, yourRank, currentLang);
            string _rankNotEvaliableTranslated = GetTranslatedString(rankNotAvaliableTranslated, rankNotAvaliable, currentLang);
            string formattedYourRank = string.Format(_yourRankTranslated, rank);

            myRank.text = localRanking > 0 ? formattedYourRank : _rankNotEvaliableTranslated;

        }

        /// <summary>
        /// Handles the selection of a ranking entry.
        /// Activates the selected image and updates selected player variables.
        /// </summary>
        /// <param name="selectedEntry">The ranking entry that was selected.</param>
        public void OnRankingEntrySelected(RankingEntry selectedEntry)
        {
            // Deactivate 'selected' image on all entries
            foreach (var entry in rankingEntries)
            {
                entry.SetSelected(false);
            }

            // Activate 'selected' image on the selected entry
            selectedEntry.SetSelected(true);

            // Update selected player variables
            selectedPlayerNickname.text = selectedEntry.playerName.text;
            string stringRankTranslated = GetTranslatedString(rankTranslated, rank, currentLang);
            selectedPlayerRank.text = $"{stringRankTranslated} {selectedEntry.ranking.text}";
            selectedPlayerIcon.sprite = selectedEntry.playerIcon.sprite;
            selectedPlayerFrame.sprite = selectedEntry.playerFrame.sprite;

            // Display the favorite character
            DisplayFavouriteCharacter(selectedEntry.characterFavourite);
        }

        /// <summary>
        /// Instantiates the favorite character in the specified container.
        /// </summary>
        /// <param name="characterId">The ID of the character to instantiate.</param>
        public void DisplayFavouriteCharacter(int characterId)
        {
            // Clear existing favorite character display
            foreach (Transform child in characterFavouriteContainer)
            {
                Destroy(child.gameObject);
            }

            // Find the character prefab by ID and instantiate it
            CharacterData characterPrefab = null;
            foreach (var character in GameInstance.Singleton.characterData)
            {
                if (character.characterId == characterId)
                {
                    characterPrefab = character;
                    break;
                }
            }

            if (characterPrefab != null)
            {
                Instantiate(characterPrefab.characterModel, characterFavouriteContainer);
            }
            else
            {
                Debug.LogWarning("Character with ID " + characterId + " not found.");
            }

            if (DragRotateAndHit.Singleton != null)
            {
                DragRotateAndHit.Singleton.UpdateCharacter();
            }
        }

        public Sprite GetPlayerIcon(string iconId)
        {

            foreach (var icon in GameInstance.Singleton.iconItems)
            {
                if (icon.iconId == iconId)
                {                   
                    return icon.icon; ;
                }
            }
            return null;
        }

        public Sprite GetPlayerFrame(string frameId)
        {

            foreach (var frame in GameInstance.Singleton.frameItems)
            {
                if (frame.frameId == frameId)
                {
                    return frame.icon; ;
                }
            }
            return null;
        }
        private string GetTranslatedString(NameTranslatedByLanguage[] translations, string fallback, string currentLang)
        {
            if (translations != null)
            {
                foreach (var trans in translations)
                {
                    if (!string.IsNullOrEmpty(trans.LanguageId)
                        && trans.LanguageId.Equals(currentLang)
                        && !string.IsNullOrEmpty(trans.Translate))
                    {
                        return trans.Translate;
                    }
                }
            }
            return fallback;
        }

        /// <summary>
        /// Starts the cooldown for the refresh button and updates the UI.
        /// </summary>
        /// <returns></returns>
        private IEnumerator StartCooldown()
        {
            isCooldownActive = true;
            refreshButton.interactable = false;

            float elapsedTime = 0f;
            while (elapsedTime < cooldownTime)
            {
                elapsedTime += Time.deltaTime;
                cooldownImage.fillAmount = 1 - (elapsedTime / cooldownTime);
                yield return null;
            }

            cooldownImage.fillAmount = 0f;
            refreshButton.interactable = true;
            isCooldownActive = false;
        }
    }
}