using UnityEngine;
using System.Collections;
using AppleHills.Core.Settings;

namespace Minigames.DivingForPictures
{
    /// <summary>
    /// Collision behavior that bumps the player toward the center of the trench.
    /// Uses trigger-based collision detection with coroutine-based bump timing.
    /// </summary>
    public class TileBumpCollision : PlayerCollisionBehavior
    {
        private bool _isBumping;
        private Coroutine _bumpCoroutine;
        private bool _bumpInputBlocked; // Tracks bump-specific input blocking
        
        protected override void HandleCollisionResponse(Collider2D obstacle)
        {
            // Use bump mode from developer settings
            switch (_devSettings.BumpMode)
            {
                case 0: // Impulse mode
                    StartImpulseBump();
                    break;
                    
                case 1: // SmoothToCenter mode
                    StartSmoothMoveToCenter();
                    break;
            }
            
            Debug.Log($"[TileBumpCollision] Collision handled with {(_devSettings.BumpMode == 0 ? "Impulse" : "SmoothToCenter")} mode");
        }
        
        /// <summary>
        /// Applies an impulse force toward center
        /// </summary>
        private void StartImpulseBump()
        {
            if (_isBumping || playerCharacter == null)
                return;
            
            _isBumping = true;
            
            // Block input during bump if configured
            if (_gameSettings.EndlessDescenderBlockInputDuringBump && playerController != null)
            {
                _bumpInputBlocked = true;
                // TODO: Implement input blocking
            }
            
            // Calculate direction to center (X = 0)
            float directionToCenter = Mathf.Sign(-playerCharacter.transform.position.x);
            
            // Start impulse bump coroutine
            if (_bumpCoroutine != null)
                StopCoroutine(_bumpCoroutine);
            
            _bumpCoroutine = StartCoroutine(ImpulseBumpCoroutine(directionToCenter));
            
            Debug.Log($"[TileBumpCollision] Started impulse bump with force {_gameSettings.EndlessDescenderBumpForce} in direction {directionToCenter}");
        }
        
        /// <summary>
        /// Smoothly moves the player to center
        /// </summary>
        private void StartSmoothMoveToCenter()
        {
            if (_isBumping || playerCharacter == null)
                return;
            
            _isBumping = true;
            
            // Block input during bump if configured
            if (_gameSettings.EndlessDescenderBlockInputDuringBump && playerController != null)
            {
                _bumpInputBlocked = true;
                // TODO: Implement input blocking
            }
            
            // Start smooth move coroutine
            if (_bumpCoroutine != null)
                StopCoroutine(_bumpCoroutine);
            
            _bumpCoroutine = StartCoroutine(SmoothMoveToCenterCoroutine());
            
            Debug.Log($"[TileBumpCollision] Started smooth move to center with speed {_gameSettings.EndlessDescenderSmoothMoveSpeed}");
        }
        
        /// <summary>
        /// Coroutine to handle impulse bump movement
        /// </summary>
        private IEnumerator ImpulseBumpCoroutine(float direction)
        {
            float elapsedTime = 0f;
            float bumpDuration = 0.5f; // Fixed duration for impulse
            Vector3 startPosition = playerCharacter.transform.position;
            
            while (elapsedTime < bumpDuration)
            {
                elapsedTime += Time.deltaTime;
                
                // Use evaluation time from curve for non-linear movement
                float t = elapsedTime / bumpDuration;
                float curveValue = _devSettings.BumpCurve.Evaluate(t);
                
                // Calculate movement distance based on force and curve
                float distance = _gameSettings.EndlessDescenderBumpForce * curveValue * Time.deltaTime;
                
                // Move the player toward center
                Vector3 newPosition = playerCharacter.transform.position;
                newPosition.x += direction * distance;
                
                // Clamp to valid range
                newPosition.x = Mathf.Clamp(newPosition.x, _gameSettings.EndlessDescenderClampXMin, _gameSettings.EndlessDescenderClampXMax);
                
                // Apply the position
                playerCharacter.transform.position = newPosition;
                
                yield return null;
            }
            
            // Finish bump
            _isBumping = false;
            _bumpInputBlocked = false;
            _bumpCoroutine = null;
        }
        
        /// <summary>
        /// Coroutine to handle smooth movement to center
        /// </summary>
        private IEnumerator SmoothMoveToCenterCoroutine()
        {
            Vector3 startPosition = playerCharacter.transform.position;
            Vector3 targetPosition = new Vector3(0f, startPosition.y, startPosition.z);
            
            // Calculate distance to center and expected duration
            float distanceToCenter = Mathf.Abs(startPosition.x);
            float expectedDuration = distanceToCenter / _gameSettings.EndlessDescenderSmoothMoveSpeed;
            float elapsedTime = 0f;
            
            // Move until we reach the center
            while (elapsedTime < expectedDuration)
            {
                elapsedTime += Time.deltaTime;
                
                // Calculate progress based on time and curve
                float t = elapsedTime / expectedDuration;
                float curveValue = _devSettings.BumpCurve.Evaluate(t);
                
                // Calculate interpolated position
                Vector3 newPosition = Vector3.Lerp(startPosition, targetPosition, curveValue);
                
                // Apply the position
                playerCharacter.transform.position = newPosition;
                
                yield return null;
            }
            
            // Ensure we end at exactly the center
            playerCharacter.transform.position = targetPosition;
            
            // Finish bump
            _isBumping = false;
            _bumpInputBlocked = false;
            _bumpCoroutine = null;
        }
    }
}