using UnityEngine;
using UnityEngine.AI;
using System.Collections.Generic;

[RequireComponent(typeof(NavMeshAgent))]
[RequireComponent(typeof(Animator))]
public class BossController : MonoBehaviour
{
    [SerializeField] private float maxHp = 500f;
    [SerializeField] private float currentHp = 500f;
    [field: SerializeField] public float ChaseRange { get; private set; } = 15f;
    [field: SerializeField] public float BiteRange { get; private set; } = 5f;

    [field: SerializeField] public float ChargeSpeed { get; private set; } = 14f;
    [field: SerializeField] public float ChargeDuration { get; private set; } = 2f;
    [field: SerializeField] public float ChargeMinimumDistance { get; private set; } = 6f;
    [field: SerializeField] public float ChargeCooldownDuration { get; private set; } = 4f;
    [Tooltip("突進する前の、その場での咆哮・溜め時間（秒）")]
    [field: SerializeField] public float ChargeRoarDuration { get; private set; } = 5f; // ★インスペクターに逃がして保守性を向上

    [SerializeField] public Transform ceilingAnchor;
    [SerializeField] public Transform groundAnchor;
    [field: SerializeField] public float AttackRadius { get; private set; } = 10f;
    [field: SerializeField] public float JumpRoarDuration { get; private set; } = 2f;
    
    [SerializeField] private GameObject warningMarkerPrefab;
    [SerializeField] private GameObject webPrefab;

    public NavMeshAgent Agent { get; private set; }
    public Animator Anim { get; private set; }
    public Transform Player { get; private set; }
    public float ChargeCooldownTimer { get; private set; } = 0f;
    public float NormalSpeed { get; private set; }
    public float NormalAcceleration { get; private set; }

    private ISpiderState currentState;
    private Dictionary<System.Type, ISpiderState> stateCache;

    // フェーズトリガー
    private bool triggered50 = false;
    private bool triggered25 = false;
    public bool PendingUltimate { get; set; } = false; 

    private void Awake()
    {
        Agent = GetComponent<NavMeshAgent>();
        Anim = GetComponent<Animator>();

        GameObject pObj = GameObject.FindGameObjectWithTag("Player");
        if (pObj != null) Player = pObj.transform;

        InitializeFSM();
    }

    private void Start()
    {
        if (Agent != null)
        {
            NormalSpeed = Agent.speed;
            NormalAcceleration = Agent.acceleration;
        }
    }

    private void InitializeFSM()
    {
        stateCache = new Dictionary<System.Type, ISpiderState>
        {
            { typeof(SpiderIdleState), new SpiderIdleState(this) },
            { typeof(SpiderChaseState), new SpiderChaseState(this) },
            { typeof(SpiderBiteState), new SpiderBiteState(this) },
            { typeof(SpiderChargeState), new SpiderChargeState(this) },
            { typeof(SpiderJumpToCeilingState), new SpiderJumpToCeilingState(this) },
            { typeof(SpiderCeilingAttackState), new SpiderCeilingAttackState(this) },
            { typeof(SpiderStunState), new SpiderStunState(this) }
        };

        ChangeState<SpiderIdleState>();
    }

    private void Update()
    {
        currentState?.UpdateState();

        if (ChargeCooldownTimer > 0f)
        {
            ChargeCooldownTimer -= Time.deltaTime;
        }
    }

    public void ChangeState<T>() where T : ISpiderState
    {
        if (currentState != null)
        {
            currentState.ExitState();
            ResetAllAnimationTriggers();
            Debug.Log($"🕷️ BossSpider [Exit]: {currentState.GetType().Name}");
        }

        currentState = stateCache[typeof(T)];
        Debug.Log($"🕷️ BossSpider [Enter]: {currentState.GetType().Name}");
        currentState.EnterState();
    }

    public void TakeDamage(float damage)
    {
        currentHp -= damage;
        currentHp = Mathf.Clamp(currentHp, 0, maxHp);
        float hpPercentage = (currentHp / maxHp) * 100f;

        Debug.Log($"💥 ボスに {damage} ダメージ。残りHP: {hpPercentage:F1}%");

        if (hpPercentage <= 25f && !triggered25)
        {
            triggered25 = true;
            PendingUltimate = true;
            TriggerPhaseTransition();
        }
        else if (hpPercentage <= 50f && !triggered50 && hpPercentage > 25f)
        {
            triggered50 = true;
            PendingUltimate = true;
            TriggerPhaseTransition();
        }
    }

    private void TriggerPhaseTransition()
    {
        if (currentState is not SpiderJumpToCeilingState &&
            currentState is not SpiderCeilingAttackState &&
            currentState is not SpiderStunState)
        {
            ChangeState<SpiderJumpToCeilingState>();
        }
    }

    public void TriggerParryStun()
    {
        if (currentState is SpiderBiteState || currentState is SpiderChargeState)
        {
            ChangeState<SpiderStunState>();
        }
    }

    public void ResetChargeCooldown()
    {
        ChargeCooldownTimer = ChargeCooldownDuration;
    }

    public void SpawnWarningAndWeb(Vector3 targetGroundPos, float delay, float webDuration)
    {
        StartCoroutine(SpawnWebRoutine(targetGroundPos, delay, webDuration));
    }

    private System.Collections.IEnumerator SpawnWebRoutine(Vector3 pos, float delay, float duration)
    {
        GameObject marker = null;
        if (warningMarkerPrefab != null)
        {
            marker = Instantiate(warningMarkerPrefab, pos + new Vector3(0, 0.02f, 0), Quaternion.identity);
        }

        yield return new WaitForSeconds(delay);
        if (marker != null) Destroy(marker);

        if (webPrefab != null)
        {
            GameObject web = Instantiate(webPrefab, pos, Quaternion.identity);
            Destroy(web, duration); 
        }
    }

    public void ResetAllAnimationTriggers()
    {
        if (Anim == null) return;
        Anim.ResetTrigger("Attack_Bite");
        Anim.ResetTrigger("Attack_Roar");
        Anim.ResetTrigger("ChargeStart");
        Anim.ResetTrigger("JumpUp");
        Anim.ResetTrigger("Land");
        Anim.ResetTrigger("StunStart");
    }
}

/// 共通データ（boss参照）を自動保持し、各子ステートの無駄なコードを極限まで削ります。
public abstract class SpiderStateBase : ISpiderState
{
    protected readonly BossController boss;
    
    protected SpiderStateBase(BossController owner)
    {
        boss = owner;
    }

    public virtual void EnterState() { }
    public abstract void UpdateState();
    public virtual void ExitState() { }
}

public interface ISpiderState
{
    void EnterState();
    void UpdateState();
    void ExitState();
}