using System.Collections.Generic;
using UnityEngine;

public class PositioningState : IState
{
    GameManager gm;
    GameObject chip;

    int index;
    int position;
    bool chipOnPosition;

    const int DEFAULT_SPEED = 50;

    List<int> validPositions;

    public void enter()
    {
        gm = GameManager.instance;
        chip = gm.currentChip;
        chipOnPosition = true;

        validPositions = GameManager.fieldModel.CollectNonFullCols();

        int centralIndex = validPositions.Count / 2;
        index = centralIndex;
        position = validPositions[centralIndex];
        gm.currentColumnIndex = validPositions[centralIndex];

        float offsety = gm.startY;
        if (gm.gameMode == GameMode.pvp) offsety = gm.startY + 5;//повыше

        float x = gm.slotLeftTop.position.x + validPositions[index] * gm.stepX;
        float y = gm.startY + offsety;
        chip.transform.position = new Vector3(x, y, 0);

        chip.SetActive(true);

        gm.chipPointer.Show();
        gm.chipPointer.SetColorByPlayer(gm.currentPlayer);
    }

    public void exit()
    {
        gm.pvpPointer.SetVisibility(false);
        gm.chipPointer.Hide();
    }

    public void update()
    {
        // вычисление ввода в зависимости от игрового режима
        var input = GetInputs();

        if (gm.gameMode == GameMode.pve) gm.vsBotThinkTime += Time.deltaTime;

        HandleChipMovement(input.direction);
        Vector2 stickedPosition = GetStickedPosition();
        Vector2 targetPosition = GetTargetPosition();

        gm.chipPointer.SetPosition(targetPosition);

        if (gm.gameMode == GameMode.pvp)
        {
            gm.pvpPointer.SetColor(gm.currentPlayer);
            gm.pvpPointer.SetVisibility(true);
            gm.pvpPointer.MoveTo(stickedPosition);

            stickedPosition += Vector2.up * 5;//повыше
        }

        chip.transform.position = Vector2.MoveTowards(chip.transform.position, stickedPosition, DEFAULT_SPEED * Time.deltaTime);

        if ((Vector2)chip.transform.position == stickedPosition)
            chipOnPosition = true;
        else
            chipOnPosition = false;

        if (HandleDrop(input.action)) return;
        if (HandleExitToMenu()) return;
    }

    private void HandleChipMovement(int direction)
    {
        if (!chipOnPosition) return;

        index = Mathf.Clamp(index + direction, 0, validPositions.Count - 1);
        int prevPos = position;
        position = validPositions[index];
        int dist = Mathf.Abs(position - prevPos);
        gm.chipXSpeed = dist * DEFAULT_SPEED;//скорость зануляется
        gm.currentColumnIndex = position;
        SoundManager.instance.playSwitch();
    }

    private bool HandleExitToMenu()
    {
        bool exitPressed = In.GetButtonDown(ButtonPinMapping.startOnePlayer) || In.GetButtonDown(ButtonPinMapping.startTwoPlayers);
        if (exitPressed && !gm.moveMade)
        {
            FieldCleaner.Clear();
            PaymentSystem.ReturnCredits(gm.gameMode);
            GameManager.instance.timerManager.StopAllTimers();
            GameManager.instance.stateMachine.ChangeState(new MenuState());
            return true;
        }
        return false;
    }

    private bool HandleDrop(bool action)
    {
        if (!action) return false;

        //todo: посмотреть нахуя currentColumnIndex зарыто в gm. разрыть.

        bool canDropInCurrentColumn = GameManager.fieldModel.GetColumnHeight(gm.currentColumnIndex) != -1;

        if (!(chipOnPosition && canDropInCurrentColumn))
        {
            SoundManager.instance.playWrong();
            return false;
        }

        float delayBeforeStartFalling = 0;
        if (gm.gameMode == GameMode.pve) gm.vsBotMoves += 1;

        if (gm.gameMode == GameMode.pvp)
        {
            AvatarEventBus.Instance.OnTurnEnd?.Invoke(gm.currentPlayer);
            delayBeforeStartFalling = DualAvatarController.Instance.CurrentAvatar.ChipSpawnTime;
        }

        gm.moveMade = true;
        Vector2 targetPosition = GetTargetPosition();
        gm.stateMachine.ChangeState(new ChipFallingState(startDelay: delayBeforeStartFalling, gm.currentColumnIndex));
        return true;
    }

    private Vector2 GetStickedPosition()
    {
        float targetX = gm.slotLeftTop.position.x +
                                gm.currentColumnIndex *
                                gm.stepX;
        float targetY = gm.startY;
        return new Vector2(targetX, targetY);
    }

    private Vector2 GetTargetPosition()
    {
        float targetX = gm.slotLeftTop.position.x +
                                gm.currentColumnIndex *
                                gm.stepX;
        float targetY = GameManager.instance.slotLeftTop.transform.position.y - GameManager.instance.stepY * GameManager.fieldModel.GetColumnHeight(gm.currentColumnIndex);       
        return new Vector2(targetX, targetY);
    }

    private (int direction, bool action) GetInputs()
    {
        bool left = false,
             right = false,
             action = false;
        if (gm.gameMode == GameMode.pvp)
        {
            left = In.GetButtonDownCurrentPlayer(PlayerAction.left);
            right = In.GetButtonDownCurrentPlayer(PlayerAction.right);
            action = In.GetButtonDownCurrentPlayer(PlayerAction.down);
        }
        else if (gm.gameMode == GameMode.pve)
        {
            left = In.GetButtonDownAnyPlayer(PlayerAction.left);
            right = In.GetButtonDownAnyPlayer(PlayerAction.right);
            action = In.GetButtonDownAnyPlayer(PlayerAction.down);
        }

        int direction = 0;
        if (left) direction -= 1;
        if (right) direction += 1;

        return (direction, action);
    }
}