using System.Collections.Generic;
using System.IO;
using System.Linq;
using InterfaceOff.MainMenu;
using UnityEngine;
using UnityEngine.UI;

namespace InterfaceOff.WorldScene
{
    [System.Serializable]
    public struct PlayerScore
    {
        public string PlayerName;
        public float Score;
    }

    [System.Serializable]
    public struct PlayerScoreDump
    {
        public PlayerScore[] Scores;
    }

    public class ScoreTracker : MonoBehaviour
    {
        [field: SerializeField] private bool GameAngliaVersion { get; set; }
        [field: SerializeField] private Text ScoreText { get; set; }
        [field: SerializeField] private Text FinalScoreText { get; set; }
        [field: SerializeField] private WindowSpawner Spawner { get; set; }
        [field: SerializeField] private GameObject LeaderboardObject { get; set; }
        [field: SerializeField] private GameObject LeaderboardEntryPrefab { get; set; }

        [field: SerializeField] private InputField PlayerTextNameInput { get; set; }
        [field: SerializeField] private Button IDRKWhatToCallThis { get; set; }

        private static List<PlayerScore> PlayerScores { get; } = new();
        private static ScoreTracker Instance { get; set; }

        private string CurrentPlayerName { get; set; } = string.Empty;
        private bool StoredCurrentScore = false;
        private float Score;

#if UNITY_STANDALONE_WIN
        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
        private static void OnStart()
        {
            string path = Path.Combine(Application.persistentDataPath, "scores.json");
            if (File.Exists(path))
            {
                string json = File.ReadAllText(path);
                PlayerScoreDump dmp = JsonUtility.FromJson<PlayerScoreDump>(json);

                foreach (PlayerScore score in dmp.Scores)
                {
                    PlayerScores.Add(score);
                }
            }
        }

        private void OnDestroy()
        {
            Debug.Log("Dumped scores");
            
            PlayerScoreDump dmp = new();
            dmp.Scores = PlayerScores.ToArray();

            string json = JsonUtility.ToJson(dmp, prettyPrint: false);
            File.WriteAllText(Path.Combine(Application.persistentDataPath, "scores.json"), contents: json);
        }
#endif // UNITY_STANDALONE_WIN

        public static float CurrentScore()
        {
            if (DebugUtils.IsNull(Instance))
            {
                return 0;
            }

            return Instance.Score;
        }

        private void RepaintLeaderboard()
        {
            foreach (Transform child in LeaderboardObject.transform)
            {
                Destroy(child.gameObject);
            }

            PlayerScore[] scores = PlayerScores
                .OrderByDescending(playerScore => playerScore.Score)
                .Take(10)
                .ToArray();

            for (int idx = 0; idx < scores.Length; idx++)
            {
                GameObject go = Instantiate(LeaderboardEntryPrefab, LeaderboardObject.transform);
                RectTransform rect = go.GetComponent<RectTransform>();
                Text entryText = go.GetComponent<Text>();

                entryText.text = $"[{scores[idx].PlayerName}] - {scores[idx].Score:F1}";
                rect.anchoredPosition = new Vector2(0, 220 - ((idx + 1) * 40));
            }
        }

        private void Awake()
        {
            RepaintLeaderboard();
            Instance = this;
        }

        private void Update()
        {
            if (Spawner.AutoSpawn)
            {
                StoredCurrentScore = false;

                Score = Time.timeSinceLevelLoad * DifficultyManager.DifficultyEffect;
                ScoreText.text = $"Score: {Score:F1}";
            }

            else
            {
                FinalScoreText.text = $"Your final score is: {Score:F1}";
                ScoreText.text = null;
            }
        }

        public void AddCurrentScoreToLeaderboard()
        {
            if (CurrentPlayerName != string.Empty && !StoredCurrentScore)
            {
                PlayerScore score = new();
                score.PlayerName = CurrentPlayerName;
                score.Score = CurrentScore();

                StoredCurrentScore = true;
                PlayerScores.Add(score);
                RepaintLeaderboard();

                PlayerTextNameInput.interactable = false;
                IDRKWhatToCallThis.interactable = false;
            }
        }

        public void SetPlayerName(string input) => CurrentPlayerName = input;
    }
}