using System.Collections;
using UnityEngine;

public class RaftStartManager : MonoBehaviour
{
    private enum StartState
    {
        Ready,
        WaitingForKeyGrab,
        Starting,
        Riding,
        Arrived,
        Failed
    }

    [Header("References")]
    [SerializeField] private RaftRiverController raftController;
    [SerializeField] private SteeringKeyXR steeringKey;

    [Tooltip("현재는 캡슐 요정. 나중에 요정 캐릭터 모델로 교체할 부모 오브젝트를 넣으면 됩니다.")]
    [SerializeField] private GameObject fairyObject;

    [Header("Obstacles")]
    [Tooltip("뗏목 출발 시 함께 작동할 코뿔소들입니다.")]
    [SerializeField] private RhinoObstacle[] rhinos;

    [Header("Health")]
    [SerializeField] private RaftHealth raftHealth;

    [Header("Start Settings")]
    [SerializeField] private bool waitForKeyGrab = true;

    [Tooltip("키를 잡은 뒤 뗏목이 완전히 출발 속도에 도달하기까지 걸리는 시간")]
    [SerializeField] private float startAccelerationDuration = 2.0f;

    [Tooltip("출발 직후 바로 요정이 사라질지 여부")]
    [SerializeField] private bool hideFairyOnStart = true;

    [Header("Debug")]
    [SerializeField] private bool showDebugLog = true;

    private StartState state = StartState.Ready;
    private Coroutine startRoutine;

    private void Start()
    {
        SetupStartState();
    }

    private void Update()
    {
        if (state != StartState.WaitingForKeyGrab)
            return;

        if (!waitForKeyGrab)
            return;

        if (steeringKey != null && steeringKey.IsGrabbed)
        {
            BeginRaftRide();
        }
    }

    private void SetupStartState()
    {
        ResolveReferences();

        state = StartState.WaitingForKeyGrab;

        if (raftController != null)
        {
            raftController.StopRaft();
            raftController.SetSpeedMultiplier(0f);
        }

        if (raftHealth != null)
        {
            raftHealth.ResetHealth();
        }

        StopAllRhinos();

        if (fairyObject != null)
        {
            fairyObject.SetActive(true);
        }

        if (showDebugLog)
        {
            Debug.Log("[RaftStartManager] 시작 준비 완료. 키를 잡으면 뗏목이 출발합니다.");
        }
    }

    private void ResolveReferences()
    {
        if (raftController == null)
            raftController = FindFirstObjectByType<RaftRiverController>();

        if (steeringKey == null)
            steeringKey = FindFirstObjectByType<SteeringKeyXR>();

        if (raftHealth == null)
            raftHealth = FindFirstObjectByType<RaftHealth>();

        if (rhinos == null || rhinos.Length == 0)
            rhinos = FindObjectsByType<RhinoObstacle>(FindObjectsSortMode.None);
    }

    public void BeginRaftRide()
    {
        if (state == StartState.Starting || state == StartState.Riding)
            return;

        state = StartState.Starting;

        if (hideFairyOnStart && fairyObject != null)
        {
            fairyObject.SetActive(false);
        }

        if (startRoutine != null)
            StopCoroutine(startRoutine);

        startRoutine = StartCoroutine(StartRaftSmoothly());
    }

    private IEnumerator StartRaftSmoothly()
    {
        if (raftController == null)
        {
            Debug.LogWarning("[RaftStartManager] RaftRiverController가 연결되지 않았습니다.", this);
            yield break;
        }

        raftController.SetSpeedMultiplier(0f);
        raftController.ResumeRaft();

        StartAllRhinos();

        if (showDebugLog)
        {
            Debug.Log("[RaftStartManager] 뗏목 출발 시작. 코뿔소 장애물도 시작합니다.");
        }

        float timer = 0f;
        float duration = Mathf.Max(0.01f, startAccelerationDuration);

        while (timer < duration)
        {
            timer += Time.deltaTime;

            float t = Mathf.Clamp01(timer / duration);
            float smoothT = t * t * (3f - 2f * t);

            raftController.SetSpeedMultiplier(smoothT);

            yield return null;
        }

        raftController.SetSpeedMultiplier(1f);

        state = StartState.Riding;

        if (showDebugLog)
        {
            Debug.Log("[RaftStartManager] 뗏목 정상 운항 속도 도달.");
        }
    }

    public void OnRaftArrived()
    {
        if (state == StartState.Arrived)
            return;

        state = StartState.Arrived;

        if (raftController != null)
        {
            raftController.SetSpeedMultiplier(0f);
        }

        StopAllRhinos();

        if (showDebugLog)
        {
            Debug.Log("[RaftStartManager] 목적지 도착. 뗏목 구간 종료. 코뿔소 장애물 정지.");
        }
    }

    public void OnRaftFailed()
    {
        if (state == StartState.Failed)
            return;

        state = StartState.Failed;

        if (raftController != null)
        {
            raftController.StopRaft();
            raftController.SetSpeedMultiplier(0f);
        }

        StopAllRhinos();

        if (showDebugLog)
        {
            Debug.Log("[RaftStartManager] 체력 0. 뗏목 구간 실패. 코뿔소 장애물 정지.");
        }
    }

    private void StartAllRhinos()
    {
        if (rhinos == null)
            return;

        foreach (RhinoObstacle rhino in rhinos)
        {
            if (rhino == null)
                continue;

            rhino.StartRhino();
        }
    }

    private void StopAllRhinos()
    {
        if (rhinos == null)
            return;

        foreach (RhinoObstacle rhino in rhinos)
        {
            if (rhino == null)
                continue;

            rhino.StopRhino();
        }
    }
}