using System.Collections;
using Core;
using Minigames.TrashMaze.Core;
using Minigames.TrashMaze.Data;
using Unity.Cinemachine;
using UnityEngine;

namespace Minigames.TrashMaze.Objects
{
    /// <summary>
    /// Static helper class for trash maze teleportation logic.
    /// Provides reusable methods for:
    /// - Starting camera blend to a target state
    /// - Teleporting a character midway through blend
    /// - Repositioning camera to teleported character
    /// - Setting up camera tracking after blend completes
    /// </summary>
    public static class TeleportationHelper
    {
        /// <summary>
        /// Get the camera for the target camera state
        /// </summary>
        private static CinemachineCamera GetTargetCamera(TrashMazeCameraState cameraState)
        {
            if (TrashMazeCameraController.Instance == null)
                return null;

            return cameraState switch
            {
                TrashMazeCameraState.Gameplay => TrashMazeCameraController.Instance.GetGameplayCamera(),
                TrashMazeCameraState.Maze => TrashMazeCameraController.Instance.GetMazeCamera(),
                TrashMazeCameraState.PulverGameplay => TrashMazeCameraController.Instance.GetPulverGameplayCamera(),
                _ => null
            };
        }

        /// <summary>
        /// Start the camera blend to the target state
        /// </summary>
        public static void StartCameraBlend(TrashMazeCameraState targetState)
        {
            if (TrashMazeCameraController.Instance != null)
            {
                Logging.Debug($"[TeleportationHelper] Starting camera blend to {targetState}");
                
                switch (targetState)
                {
                    case TrashMazeCameraState.Gameplay:
                        TrashMazeCameraController.Instance.SwitchToGameplay();
                        break;
                    case TrashMazeCameraState.Maze:
                        TrashMazeCameraController.Instance.SwitchToMaze();
                        break;
                    case TrashMazeCameraState.PulverGameplay:
                        TrashMazeCameraController.Instance.SwitchToPulverGameplay();
                        break;
                }
            }
            else
            {
                Debug.LogError($"[TeleportationHelper] TrashMazeCameraController instance not found!");
            }
        }

        /// <summary>
        /// Coroutine that waits for halfway through camera blend, then teleports the character
        /// and immediately sets it as the tracking target for the camera
        /// </summary>
        public static IEnumerator TeleportMidBlendAndSetTracking(GameObject character, Transform teleportTarget, TrashMazeCameraState targetCameraState)
        {
            CinemachineBrain brain = Camera.main?.GetComponent<CinemachineBrain>();
            
            if (brain != null && brain.IsBlending)
            {
                // Get blend duration from brain
                float blendDuration = brain.ActiveBlend != null ? brain.ActiveBlend.Duration : 1f;
                float halfBlendTime = blendDuration / 2f;
                
                Logging.Debug($"[TeleportationHelper] Waiting {halfBlendTime:F2}s (half of {blendDuration:F2}s blend) before teleport");
                
                // Wait for halfway through the blend
                yield return new WaitForSeconds(halfBlendTime);
            }
            else
            {
                // Fallback: wait a short moment if no blend is detected
                yield return new WaitForSeconds(0.25f);
            }

            // Teleport character
            if (character != null && teleportTarget != null)
            {
                character.transform.position = teleportTarget.position;
                character.transform.rotation = teleportTarget.rotation;
                Logging.Debug($"[TeleportationHelper] Teleported {character.name} to {teleportTarget.position}");
                
                // Immediately set as tracking target - let the blend finish naturally
                SetCameraTrackingTarget(character, targetCameraState);
            }
            else
            {
                if (character == null)
                    Debug.LogError($"[TeleportationHelper] Character GameObject is null!");
                if (teleportTarget == null)
                    Debug.LogError($"[TeleportationHelper] Teleport target not assigned!");
            }
        }

        /// <summary>
        /// Wait for camera blend to complete
        /// </summary>
        public static IEnumerator WaitForCameraBlend()
        {
            CinemachineBrain brain = Camera.main?.GetComponent<CinemachineBrain>();
            
            if (brain != null)
            {
                // Wait until blend is complete
                while (brain.IsBlending)
                {
                    yield return null;
                }
                
                Logging.Debug($"[TeleportationHelper] Camera blend completed");
            }
            else
            {
                // Fallback: wait a brief moment
                yield return new WaitForSeconds(0.5f);
            }
        }

        /// <summary>
        /// Set a character as the tracking target for the target camera
        /// </summary>
        public static void SetCameraTrackingTarget(GameObject character, TrashMazeCameraState targetCameraState)
        {
            if (character == null)
            {
                Debug.LogError($"[TeleportationHelper] Cannot set tracking target - character is null");
                return;
            }

            var targetCamera = GetTargetCamera(targetCameraState);
            if (targetCamera != null)
            {
                targetCamera.Follow = character.transform;
                targetCamera.LookAt = character.transform;
                Logging.Debug($"[TeleportationHelper] Set {character.name} as tracking target for {targetCameraState} camera");
            }
            else
            {
                Debug.LogError($"[TeleportationHelper] Target camera for state {targetCameraState} not found!");
            }
        }
    }
}