using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using PrizeSystem;
using System;

public class CharactersController : MonoBehaviour
{
    public static CharactersController I;

    [SerializeField] private Transform charactersContainer;
    [SerializeField] private Transform charactersPool;
    [SerializeField] private List<Character> characterPrefabs;
    [SerializeField] private Vector2 hiddenLocalPosition;
    [SerializeField] private Vector2 shownLocalPosition;
    [SerializeField] private float speed;

    private Character[] characters;
    private bool charactersActivated = false;
    private int currentIndex = 0;

    public static int CharactersAmount => I.characters.Length;
    public static Character CurrentCharacter => I.characters[I.currentIndex];
    public static Character NextCharacter
    {
        get
        {
            if (I.currentIndex + 1 < I.characters.Length)
            {
                return I.characters[I.currentIndex + 1];
            }
            else return null;
        }
    }
    
    public void Initialize()
    {
        I = this;
        SetupCharacters();
        GameManager.OnGameStarted += Enable;
        GameManager.OnGameFinished += Disable;
    }

    public void Enable(GameMode gameMode)
    {
        if(gameMode == GameMode.pve)
            print("ВКЛЮЧЕНИЕ СИСТЕМЫ ПЕРСОНАЖЕЙ");
    }
    public void Disable(GameMode gameMode)
    {
        if (gameMode == GameMode.pve)
            print("ВЫКЛЮЧЕНИЕ СИСТЕМЫ ПЕРСОНАЖЕЙ");
    }

    public void SetAllCharactersPrizeAvailable(bool value)
    {
        foreach (Character character in I.characters)
            character.HasPrize = value;
    }

    public static void ResetAllCharactersDifficulty()
    {
        foreach (Character ch in I.characters)
            ch.currentDifficulty = ch.CurrenDifficultyList.Count / 2; //берем средню сложность изначально
    }

    public static void HideCharacter()
    {
        CurrentCharacter?.UnbindEvents();
        I.StopAllCoroutines();
        I.StartCoroutine(I.MoveLocal(I.charactersContainer, I.hiddenLocalPosition, I.speed));
    }

    public static void SwitchToCharacter(int index)
    {
        I.StopAllCoroutines();
        I.StartCoroutine(I.TransitionToCharacter(index));
    }

    public static void ResetState()
    {
        I.StopAllCoroutines();
        I.charactersContainer.transform.localPosition = I.hiddenLocalPosition;
        I.ClearContainer();
        I.charactersActivated = false;
        I.currentIndex = 0;
    }

    public static Character[] GetCharactersArray() => new List<Character>(I.characters).ToArray();

    private void SetupCharacters()
    {
        if (characterPrefabs.Count <= 0)
            throw new System.Exception("Не заданы боты в контроллере");

        int amount = characterPrefabs.Count;
        characters = new Character[amount];

        for (int i = 0; i < amount; i++)
        {
            var character = Instantiate(characterPrefabs[i], charactersPool);
            characters[i] = character;
            
            character.transform.localPosition = hiddenLocalPosition;
            character.Animator.SetTrigger("PreAppear");
        }

        ClearContainer();
        RefreshPrizes();
    }

    public void RefreshPrizes()
    {
        List<Prize> prizes = PrizeSerializer.LoadPrizes();

        for (int i = 0; i < characters.Length; i++)
            characters[i].prize = prizes[i];
    }

    private void ClearContainer()
    {
        for (int i = charactersContainer.childCount - 1; i >= 0; i--)
        {
            var child = charactersContainer.transform.GetChild(i);
            child.SetParent(charactersPool);
        }
    }
    
    private void SetCharacter(int index)
    {
        ClearContainer();

        if (index < 0 || index >= CharactersAmount) index = 0;

        var newCharacter = characters[index];

        //сажаем нового в контейнер
        newCharacter.transform.SetParent(charactersContainer);
        newCharacter.transform.localPosition = newCharacter.CharacterLocalPosition;

        newCharacter.Animator.SetTrigger("PreAppear");
        //animator.ResetTrigger("Throw");

        newCharacter.BindEvents();
    }

    private IEnumerator MoveLocal(Transform t, Vector3 targetLocalPos, float speed)
    {
        while (t.localPosition != targetLocalPos)
        {
            t.localPosition = Vector3.MoveTowards(t.localPosition, targetLocalPos, speed * Time.deltaTime);
            yield return null;
        }
    }

    private IEnumerator TransitionToCharacter(int newIndex)
    {
        int oldIndex = currentIndex;
        currentIndex = newIndex;
        LightUtility.Character(characters[newIndex]);

        //Отсекаем попытку переключиться на того же персонажа
        if (newIndex == oldIndex && charactersActivated) yield break; // тостер отсекается. надо решать
        charactersActivated = true; //чтобы тостер тоже приходил иначе старт 0, запрашиваем 0 персонажа -> тостер отсекся

        //сразу отвязываем реплики старого персонажа
        characters[oldIndex]?.UnbindEvents();

        Transform container = charactersContainer;

        //Уводим контейнер за экран
        yield return MoveLocal(charactersContainer, hiddenLocalPosition, speed);
        characters[oldIndex].Animator.SetTrigger("PreAppear");

        //Сажаем нового персонажа
        SetCharacter(newIndex);
        yield return new WaitForSeconds(0.1f);

        //Выводим на экран
        yield return MoveLocal(charactersContainer, shownLocalPosition, speed);

        //дергаем появление
        CharacterEventBus.Instance.OnCharacterAppeared?.Invoke();

        //понижение уровня
        if (newIndex < oldIndex)
            CharacterEventBus.Instance.OnLevelDown?.Invoke();
    }
}