using UnityEngine;

// ==========================================
// ■ STATE: IDLE (待機状態)
// ==========================================
public class SpiderIdleState : ISpiderState
{
    private BossController boss;
    public SpiderIdleState(BossController owner) => boss = owner;

    public void EnterState() => boss.Anim.SetTrigger("Idle");
    public void ExitState() { }

    public void UpdateState()
    {
        if (boss.Player == null) return;

        // プレイヤーを検知したら即座に追跡へ
        if (Vector3.Distance(boss.transform.position, boss.Player.position) <= boss.chaseRange)
        {
            boss.ChangeState<SpiderChaseState>();
        }
    }
}

// ==========================================
// ■ STATE: CHASE (追跡・行動分岐状態)
// ==========================================
public class SpiderChaseState : ISpiderState
{
    private BossController boss;
    private float decisionCooldown = 0f;

    public SpiderChaseState(BossController owner) => boss = owner;

    public void EnterState() => boss.Agent.isStopped = false;
    public void ExitState() => boss.Agent.isStopped = true;

    public void UpdateState()
    {
        if (boss.Player == null) return;

        // NavMeshでの追従
        boss.Agent.SetDestination(boss.Player.position);
        boss.Anim.SetFloat("Speed", boss.Agent.velocity.magnitude);

        // ディシジョン（思考）タイマーの更新
        decisionCooldown -= Time.deltaTime;
        if (decisionCooldown > 0f) return;

        float distance = Vector3.Distance(boss.transform.position, boss.Player.position);

        // 1. 至近距離 ➔ 通常噛みつき
        if (distance <= boss.biteRange)
        {
            boss.ChangeState<SpiderBiteState>();
            decisionCooldown = 2f;
        }
        // 2. 中距離 ➔ 走って体当たり攻撃
        else if (distance > boss.biteRange && distance <= boss.chaseRange * 0.6f)
        {
            boss.ChangeState<SpiderChargeState>();
            decisionCooldown = 5f;
        }
    }
}

// ==========================================
// ■ STATE: BITE (通常噛みつき - パリィ可)
// ==========================================
public class SpiderBiteState : ISpiderState
{
    private BossController boss;
    private float stateTimer;

    public SpiderBiteState(BossController owner) => boss = owner;

    public void EnterState()
    {
        stateTimer = 1.5f; // 攻撃アニメーションの想定想定想定
        boss.Anim.SetTrigger("Attack_Bite");
        Debug.Log("🎯 蜘蛛ボス：噛みつき攻撃！（パリィ受付中）");
    }

    public void ExitState() { }

    public void UpdateState()
    {
        stateTimer -= Time.deltaTime;
        if (stateTimer <= 0f)
        {
            // 攻撃が終わったら、フェーズ移行チェックを挟みつつ追跡に戻る
            if (boss.PendingUltimate) boss.ChangeState<SpiderJumpToCeilingState>();
            else boss.ChangeState<SpiderChaseState>();
        }
    }
}

// ==========================================
// ■ STATE: CHARGE (走って体当たり突進 - パリィ可)
// ==========================================
public class SpiderChargeState : ISpiderState
{
    private BossController boss;
    private float roarTimer;
    private float chargeTimer;
    private Vector3 chargeDirection;
    private bool isChargingPhase;

    public SpiderChargeState(BossController owner) => boss = owner;

    public void EnterState()
    {
        roarTimer = 1.5f;
        chargeTimer = boss.chargeDuration;
        isChargingPhase = false;

        boss.Agent.enabled = false; // 移動をマニュアル制御するためNavMeshを切る

        // 1. まず「威嚇の咆哮」アニメーションをトリガー
        boss.Anim.SetTrigger("Attack_Roar");
        Debug.Log("🔊 蜘蛛ボス：走る前に威嚇の咆哮中...（この間にプレイヤーはパリィの構えが可能）");
    }

    public void ExitState()
    {
        boss.Anim.SetBool("IsCharging", false);
        boss.Agent.enabled = true;
    }

    public void UpdateState()
    {
        // フェーズ1：威嚇中（その場で動かない）
        if (!isChargingPhase)
        {
            roarTimer -= Time.deltaTime;

            // 威嚇中もプレイヤーの方向をじっと見据える（ロックオン演出）
            if (boss.Player != null)
            {
                Vector3 lookDir = (boss.Player.position - boss.transform.position).normalized;
                lookDir.y = 0;
                if (lookDir != Vector3.zero) boss.transform.rotation = Quaternion.Slerp(boss.transform.rotation, Quaternion.LookRotation(lookDir), Time.deltaTime * 5f);
            }

            if (roarTimer <= 0f)
            {
                // 威嚇終了、ここから本番の突進フェーズへ
                isChargingPhase = true;
                boss.Anim.SetTrigger("ChargeStart");
                boss.Anim.SetBool("IsCharging", true);

                if (boss.Player != null)
                {
                    chargeDirection = (boss.Player.position - boss.transform.position).normalized;
                    chargeDirection.y = 0;
                    boss.transform.rotation = Quaternion.LookRotation(chargeDirection);
                }
            }
            return;
        }

        // フェーズ2：突進中（直線移動を実行。ここからプレイヤーはパリィ可能）
        boss.transform.position += chargeDirection * boss.chargeSpeed * Time.deltaTime;

        chargeTimer -= Time.deltaTime;
        if (chargeTimer <= 0f)
        {
            boss.ChangeState<SpiderChaseState>();
        }
    }
}

// ==========================================
// ■ STATE: JUMP TO CEILING (天井への大ジャンプ)
// ==========================================
public class SpiderJumpToCeilingState : ISpiderState
{
    private BossController boss;
    private float roarTimer;
    private float jumpProgress;
    private Vector3 startPos;
    private bool isJumpingPhase;

    public SpiderJumpToCeilingState(BossController owner) => boss = owner;

    public void EnterState()
    {
        roarTimer = 2.0f; // ★天井に飛ぶ前の大威嚇の時間 (2.0秒)
        jumpProgress = 0f;
        startPos = boss.transform.position;
        isJumpingPhase = false;

        boss.Agent.enabled = false;

        // 1. 必殺技移行を知らせる威嚇の咆哮
        boss.Anim.SetTrigger("Attack_Roar");
        Debug.Log("🚨 蜘蛛ボス：必殺技前の一大威嚇（咆哮）！ このあと天井へ飛びます。");
    }

    public void ExitState() { }

    public void UpdateState()
    {
        // フェーズ1：飛び立つ前の威嚇ポーズ（その場で足止め）
        if (!isJumpingPhase)
        {
            roarTimer -= Time.deltaTime;
            if (roarTimer <= 0f)
            {
                isJumpingPhase = true;
                boss.Anim.SetTrigger("JumpUp"); // ジャンプアニメーションへ
            }
            return;
        }

        // フェーズ2：本来の大ジャンプ空中移動
        if (boss.ceilingAnchor == null) return;

        jumpProgress += Time.unscaledDeltaTime * 1.5f;

        Vector3 currentPos = Vector3.Lerp(startPos, boss.ceilingAnchor.position, jumpProgress);
        currentPos.y += Mathf.Sin(jumpProgress * Mathf.PI) * 3f;

        boss.transform.position = currentPos;

        if (jumpProgress >= 1f)
        {
            boss.transform.position = boss.ceilingAnchor.position;
            boss.ChangeState<SpiderCeilingAttackState>();
        }
    }
}

// ==========================================
// ■ STATE: CEILING ATTACK (必殺技：天井糸吐き)
// ==========================================
public class SpiderCeilingAttackState : ISpiderState
{
    private BossController boss;
    private float stateDuration = 7.0f; // 必殺技全体の長さ（秒）
    private float shotInterval = 0.4f;   // 糸を降らせる間隔
    private float timer = 0f;
    private float shotTimer = 0f;

    public SpiderCeilingAttackState(BossController owner) => boss = owner;

    public void EnterState()
    {
        timer = stateDuration;
        shotTimer = 0f;
        boss.Anim.SetBool("IsOnCeiling", true);
        boss.PendingUltimate = false; // 発動権を消化
        Debug.Log("🕸️ 蜘蛛ボス：天井から無数の糸を乱射中！");
    }

    public void ExitState()
    {
        boss.Anim.SetBool("IsOnCeiling", false);
        // 地上の着地座標へ位置をリセットしてNavMeshを復帰
        if (boss.groundAnchor != null) boss.transform.position = boss.groundAnchor.position;
        boss.Agent.enabled = true;
        boss.Anim.SetTrigger("Land");
    }

    public void UpdateState()
    {
        timer -= Time.deltaTime;
        shotTimer -= Time.deltaTime;

        if (shotTimer <= 0f)
        {
            ExecuteRandomWebAttack();
            shotTimer = shotInterval;
        }

        // 時間が来たら、地上へ復帰
        if (timer <= 0f)
        {
            boss.ChangeState<SpiderChaseState>();
        }
    }

    private void ExecuteRandomWebAttack()
    {
        // ボスの中央（地上座標）を基準に、ランダムな円内に糸を降らせる
        Vector2 randomCircle = Random.insideUnitCircle * boss.attackRadius;
        Vector3 targetGroundPos = new Vector3(
            boss.groundAnchor.position.x + randomCircle.x,
            boss.groundAnchor.position.y,
            boss.groundAnchor.position.z + randomCircle.y
        );

        // 予兆を出し、1.0秒後に2.5秒間残る糸を生成する
        boss.SpawnWarningAndWeb(targetGroundPos, 1.0f, 2.5f);
    }
}

// ==========================================
// ■ STATE: STUN (チャンスタイム - パリィ成功時)
// ==========================================
public class SpiderStunState : ISpiderState
{
    private BossController boss;
    private float stunTimer;

    public SpiderStunState(BossController owner) => boss = owner;

    public void EnterState()
    {
        stunTimer = 4.0f; // 4秒間の完全な無防備状態（チャンスタイム）
        boss.Anim.SetTrigger("StunStart");
        boss.Anim.SetBool("IsStunned", true);
        if (boss.Agent.enabled) boss.Agent.isStopped = true;
        Debug.Log("🛡️ パリィ成功！ 蜘蛛ボスがひっくり返ってスタン中！ チャンスタイム！");
    }

    public void ExitState()
    {
        boss.Anim.SetBool("IsStunned", false);
        if (boss.Agent.enabled) boss.Agent.isStopped = false;
    }

    public void UpdateState()
    {
        stunTimer -= Time.deltaTime;
        if (stunTimer <= 0f)
        {
            // スンが明けたら、もしHPトリガーが裏で引かれていれば優先して天井へ
            if (boss.PendingUltimate) boss.ChangeState<SpiderJumpToCeilingState>();
            else boss.ChangeState<SpiderChaseState>();
        }
    }
}