using System.Collections;
using System.Collections.Generic;
using UnityEditor.Tilemaps;
using UnityEngine;
using UnityEngine.InputSystem;

public class Player : MonoBehaviour
{
    [Header("Player Settings")]
    [SerializeField] private float flyForce = 1.5f;           // Force applied when player flies
    [SerializeField] private float rotationSpeed = 10f;       // Rotation multiplier based on vertical speed
    [SerializeField] private float autoFlyInterval = 0.5f;    // Time between auto-fly inputs

    private Rigidbody2D rb2D;

    private bool canMove = false;              // Controls if player can move (used after game start)
    private bool waitingForFirstInput = false; // True when waiting for first player input
    private bool firstInputReceived = false;   // True after first manual input is detected
    private bool autoFlying = false;           // True when auto-flying is active

    private Coroutine autoFlyRoutine;          // Reference to auto-fly coroutine
    private PlayerInput playerInput;           // PlayerInput system instance

    private void Awake()
    {
        playerInput = new PlayerInput();   // Create input system instance
        playerInput.Enable();              // Enable input system

        SetUpActions();                    // Bind input events
    }

    // Start auto-flying and wait for the player to tap for manual control
    public void StartAutoFly()
    {
        autoFlying = true;
        autoFlyRoutine = StartCoroutine(AutoFlyLoop());
        WaitForFirstInput();
    }

    // Stop auto-fly behavior if it's running
    public void StopAutoFly()
    {
        autoFlying = false;
        if (autoFlyRoutine != null)
            StopCoroutine(autoFlyRoutine);
    }

    // Repeatedly applies fly input at fixed intervals until first tap
    private IEnumerator AutoFlyLoop()
    {
        while (autoFlying)
        {
            Fly();
            yield return new WaitForSeconds(autoFlyInterval);
        }
    }

    // Set up player input actions
    private void SetUpActions()
    {
        // This handles input for fly action
        playerInput.Player.fly.performed += context =>
        {
            // If we’re still in auto-fly and waiting for first tap
            if (waitingForFirstInput && !firstInputReceived)
            {
                firstInputReceived = true;
                waitingForFirstInput = false;

                StopAutoFly();                          // Stop hovering
                GameManager.Instance.StartGamePlay();   // Start actual game
            }

            Fly(); // Apply fly movement
        };
    }

    // Handles flying logic (velocity upwards)
    private void Fly()
    {
        if (canMove)
        {
            rb2D.velocity = Vector2.up * flyForce;
        }
    }

    // Apply rotation based on vertical speed for visual feedback
    private void FixedUpdate()
    {
        if (canMove)
        {
            transform.rotation = Quaternion.Euler(0, 0, rb2D.velocity.y * rotationSpeed);
        }
    }

    // Unsubscribe input when object is disabled
    private void OnDisable()
    {
        playerInput.Player.fly.performed -= OnFly;
    }

    // Called to start waiting for the first manual tap
    public void WaitForFirstInput()
    {
        waitingForFirstInput = true;
        firstInputReceived = false;
    }

    // Triggered when player hits anything (walls, pipes, etc.)
    private void OnCollisionEnter2D(Collision2D collision)
    {
        GameManager.Instance.GameOver(); // End game
    }

    // Triggered when player enters score zone
    private void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.CompareTag("Score"))
        {
            GameManager.Instance.AddScore(); // Increase score
        }
    }

    // Enables or disables movement, and sets gravity accordingly
    public void SetMovement(bool value)
    {
        rb2D = gameObject.GetComponent<Rigidbody2D>();
        canMove = value;

        if (value)
        {
            rb2D.gravityScale = 0.56f; // Enable gravity
        }
        else
        {
            rb2D.gravityScale = 0f;    // Freeze player in place
        }
    }

    // Old unused input hook (cleanable)
    private void OnFly(InputAction.CallbackContext context)
    {
        Fly();
    }
}