using System;
using System.Collections.Generic;
using DungeonSelection;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.UIElements;

public class DungeonSelectMenuController : MonoBehaviour
{
    private const int NUM_HIGH_SCORES = 10;
    
    private Button _next;
    private Button _previous;
    private Button _start;
    private Image _thumbnailImage;
    private Label _dungeonName;
    private VisualElement _dungeonThumbnail;
    private ListView _highScores;

    private DungeonDisplayData _currentlyShowingDungeon;
    private List<string> _highScoreData = new List<string>();

    private void OnEnable()
    {
        VisualElement root = GetComponent<UIDocument>().rootVisualElement;

        Button rules = root.Q<Button>("Rules");
        rules.clicked += RulesClicked;
        _dungeonThumbnail = root.Q<VisualElement>("DungeonThumbnail");
        _next = root.Q<Button>("Next");
        _next.clicked += NextClicked;
        _previous = root.Q<Button>("Previous");
        _previous.clicked += PreviousClicked;
        _start = root.Q<Button>("Start");
        _start.clicked += StartClicked;
        _dungeonName = root.Q<Label>("DungeonName");
        _highScores = root.Q<ListView>("HighScoresListView");
        _highScores.makeItem = () => new Label();
        _highScores.bindItem = (element, index) => { (element as Label).text = _highScoreData[index]; };
        _highScores.itemsSource = _highScoreData;
        _highScores.makeNoneElement = () => new Label();

        GameEvents.ShowingDungeon += ShowDungeon;
        GameEvents.ShowingFirstDugeon += () => SetPreviousButtonEnabled(false);
        GameEvents.ShowingLastDungeon += () => SetNextButtonEnabled(false);
    }

    private void Start()
    {
        UIEvents.GetScores?.Invoke();
    }

    private void ShowDungeon(DungeonDisplayData dungeon)
    {
        _currentlyShowingDungeon = dungeon;
        _dungeonName.text = _currentlyShowingDungeon.DungeonData.Name;
        
        if (_thumbnailImage == null)
        {
            _thumbnailImage = new Image();
            _thumbnailImage.scaleMode = ScaleMode.ScaleAndCrop;
            _dungeonThumbnail.Add(_thumbnailImage);
        }

        _thumbnailImage.image = _currentlyShowingDungeon.DungeonData.Thumbnail.texture;

        _highScoreData.Clear();
        int rank = 1;
        foreach (ScoreDisplay score in dungeon.HighScores)
        {
            if (rank > NUM_HIGH_SCORES) break;
            string formattedScore = $"{rank}. {score.PlayerName} {score.Score}";
            _highScoreData.Add(formattedScore);
            rank++;
        }
        _highScores.RefreshItems();
    }

    private void SetPreviousButtonEnabled(bool enabled)
    {
        _previous.SetEnabled(enabled);
    }
    
    private void SetNextButtonEnabled(bool enabled)
    {
        _next.SetEnabled(enabled);
    }

    private void NextClicked()
    {
        SetPreviousButtonEnabled(true);
        SetNextButtonEnabled(true);
        UIEvents.NextDungeonClicked?.Invoke();
    }

    private void PreviousClicked()
    {
        SetPreviousButtonEnabled(true);
        SetNextButtonEnabled(true);
        UIEvents.PreviousDungeonClicked?.Invoke();
    }

    private void StartClicked()
    {
        UIEvents.EnterDungeonClicked?.Invoke(_currentlyShowingDungeon.DungeonData);
    }

    private void RulesClicked()
    {
        UIEvents.ShowRules?.Invoke();
    }
}