using UnityEngine;
using System.Threading;
using CharacterSystem;

public class Bot : BasePlayer, IGamePlayer
{
    [Header("Movement Settings")]
    [SerializeField] private float prepareSpeed;
    [SerializeField] private float moveSpeed;

    [Header("Bot Settings")]
    [SerializeField] private DifficultyPreset difficultyPreset;
    [SerializeField] private bool useDummyBots = false;
    [SerializeField] private float minThinkingTime = 1f;

    public DifficultyPreset dummyPreset;

    // State
    private PlayerState state = PlayerState.Sleep;
    private Chip currentChip;
    private int[] availableColumns;
    private int selectedColumnIndex;

    // Movement targets
    private Vector2 stickedTargetPosition;
    private Vector2 dropTargetPosition;

    // Thinking
    private Thread calculationThread;
    private int calculatedColumn = -1;
    private float thinkingStartTime;
    private bool isThinkingComplete = false;

    // Random movement
    private float randomMoveTimer;
    private float randomMoveInterval = 0.3f;

    private int droppedRow, droppedColumn;

    public event System.Action<int, int> OnChipDropped;

    private int SelectedColumn => availableColumns[selectedColumnIndex];
    public bool ControlsEnabled { get; set; } = true;

    public void PrepareChip()
    {
        SetState(PlayerState.Preparing);
        CacheAvailableColumns();
        CreateChip();
        SetInitialChipPosition();
    }

    public void Sleep()
    {
        SetState(PlayerState.Sleep);
        currentChip = null;
        availableColumns = null;
        StopThinking();
    }

    public void UpdateControls()
    {
        switch (state)
        {
            case PlayerState.Preparing:
                UpdatePreparing();
                break;
            case PlayerState.Thinking:
                UpdateThinking();
                break;
            case PlayerState.Moving:
                UpdateMoving();
                break;
            case PlayerState.Dropping:
                UpdateDropping();
                break;
            case PlayerState.Sleep:
                break;
        }
    }


    private void UpdatePreparing()
    {
        // Движение сверху вниз к stickedTargetPosition (без оффсета)
        if (currentChip.MoveToLinear(stickedTargetPosition, prepareSpeed))
        {
            StartThinking();
        }
    }

    private void UpdateThinking()
    {
        // Случайные движения (инициируют переход в Moving)
        TryRandomMovement();

        // Проверяем, завершены ли вычисления и прошло ли минимальное время
        if (isThinkingComplete && Time.time - thinkingStartTime >= minThinkingTime)
        {
            MoveToCalculatedColumn();
        }
    }

    private void UpdateMoving()
    {
        // Плавное горизонтальное движение к целевой позиции (Y сохраняется)
        if (currentChip.MoveToLinear(stickedTargetPosition, moveSpeed))
        {
            // Если условия для дропа выполнены - бросаем
            if (isThinkingComplete && Time.time - thinkingStartTime >= minThinkingTime)
            {
                PerformDrop();
            }
            else
            {
                // Иначе возвращаемся в режим раздумий
                SetState(PlayerState.Thinking);
            }
        }
    }

    private void UpdateDropping()
    {
        if (currentChip.MoveToAccelerated(dropTargetPosition))
        {
            SetState(PlayerState.Sleep);
            OnChipDropped?.Invoke(droppedColumn, droppedRow);
        }
    }

    private void StartThinking()
    {
        SetState(PlayerState.Thinking);
        isThinkingComplete = false;
        calculatedColumn = -1;
        thinkingStartTime = Time.time;
        randomMoveTimer = 0f;

        StopThinking();
        calculationThread = new Thread(CalculateBestMove);
        calculationThread.Start();
    }

    private void StopThinking()
    {
        if (calculationThread != null && calculationThread.IsAlive)
        {
            calculationThread.Abort();
            calculationThread = null;
        }
    }

    private void CalculateBestMove()
    {
        try
        {
            DifficultyPreset currentPreset = difficultyPreset;
            if (useDummyBots)
                currentPreset = dummyPreset;

            if (currentPreset != null && board != null)
            {
                int movesMade = board.MovesCount;
                currentPreset = currentPreset.GetPreset(movesMade);
                Solver.SetPreset(currentPreset);
            }

            GameManager gm = GameManager.Instance;
            if (gm != null)
            {
                bool onBossByScore = gm.vsBotScore == gm.botsAmount - 1;
                bool isHardCommonDifficulty = SettingsManager.GetString(SettingKey.DIFFICULTY) == "Сложная";
                bool isUpperCashDifficulty = SettingsManager.GetString(SettingKey.DIFFICULTY_MODE) == "Заработок";
                bool needSuperPreset = onBossByScore && (isHardCommonDifficulty || isUpperCashDifficulty);

                if (needSuperPreset)
                    calculatedColumn = SolverV2.FindBestMove(board.GridToTeam(), team);
                else
                    calculatedColumn = Solver.FindBestMove(board.GridToTeam(), team);
            }
            else
            {
                calculatedColumn = Solver.FindBestMove(board.GridToTeam(), team);
            }

            isThinkingComplete = true;
        }
        catch (ThreadAbortException) { }
        catch (System.Exception e)
        {
            Debug.LogError($"Bot calculation error: {e.Message}");
        }
    }

    private void MoveToCalculatedColumn()
    {
        if (calculatedColumn == -1) return;

        int targetIndex = System.Array.IndexOf(availableColumns, calculatedColumn);
        if (targetIndex == -1)
        {
            Debug.LogWarning($"Column {calculatedColumn} is not available!");
            return;
        }

        if (selectedColumnIndex == targetIndex)
        {
            
            PerformDrop();
            return;
        }

        selectedColumnIndex = targetIndex;
        UpdateTargetPositionX(board.GetStickedPosition(SelectedColumn).x);
        SetState(PlayerState.Moving);
    }

    private void PerformDrop()
    {
        dropTargetPosition = board.GetTargetPosition(SelectedColumn);

        droppedColumn = SelectedColumn;
        droppedRow = board.GetLowestEmptyRow(SelectedColumn);

        board.DropChip(currentChip, SelectedColumn);
        SetState(PlayerState.Dropping);
    }

    private void TryRandomMovement()
    {
        if (availableColumns == null || availableColumns.Length <= 1) return;

        randomMoveTimer += Time.deltaTime;
        if (randomMoveTimer >= randomMoveInterval)
        {
            randomMoveTimer = 0f;
            int direction = Random.Range(0, 2) * 2 - 1;
            int newIndex = Mathf.Clamp(selectedColumnIndex + direction, 0, availableColumns.Length - 1);

            if (newIndex != selectedColumnIndex)
            {
                selectedColumnIndex = newIndex;
                // Сохраняем текущий Y, меняем только X
                UpdateTargetPositionX(board.GetStickedPosition(SelectedColumn).x);
                SetState(PlayerState.Moving);
            }
        }
    }

    private void CacheAvailableColumns()
    {
        availableColumns = board.GetNonFullColumns();
        selectedColumnIndex = availableColumns.Length / 2;
    }

    private void CreateChip()
    {
        if (CharactersController.HasActiveCharacter && CharactersController.CurrentCharacter.visualModule.chipImage != null)
            chipSprite = CharactersController.CurrentCharacter.visualModule.chipImage;

        currentChip = ChipPool.Instance.GetConfigured(chipSprite, team);
    }

    private void SetInitialChipPosition()
    {
        // Начальная позиция – сверху с оффсетом
        stickedTargetPosition = board.GetMiddleStickedPosition();
        currentChip.transform.position = stickedTargetPosition + Vector2.up * 5f;
    }

    private void SetState(PlayerState newState) => state = newState;

    // Обновляет только X целевой позиции, Y остаётся неизменным
    private void UpdateTargetPositionX(float newX)
    {
        stickedTargetPosition = new Vector2(newX, stickedTargetPosition.y);
    }

    private enum PlayerState
    {
        Sleep,
        Preparing,
        Thinking,
        Moving,
        Dropping
    }
}