using UnityEngine;

namespace EndingSystem
{
    [RequireComponent(typeof(BoxCollider))]
    public class EndingTrigger : MonoBehaviour
    {
        [Header("Controller Reference")]
        public EndingSequenceController sequenceController;

        [Header("Trigger Settings")]
        [Tooltip("If true, the sequence will start when the player enters the trigger. If false, you can call TriggerSequence() manually (e.g., from a UI Button).")]
        public bool triggerOnCollision = true;
        [Tooltip("Tag of the player object to detect collision")]
        public string playerTag = "Player";

        [Header("Win Condition")]
        [Tooltip("If true, collision trigger requires EndingWinConditionService.CanTriggerEnding == true")]
        public bool requireWinConditionToTrigger = true;
        [Tooltip("If true, TriggerSequence() will ignore win condition (useful for debug buttons)")]
        public bool allowManualTriggerWhenLocked = true;

        private bool hasTriggered = false;

        private void OnEnable()
        {
            enabled = true;
            triggerOnCollision = true;
            requireWinConditionToTrigger = false;
            hasTriggered = false;

            var coll = GetComponent<BoxCollider>();
            if (coll != null) coll.isTrigger = true;
        }

        private void Awake()
        {
            enabled = true;
            triggerOnCollision = true;
            requireWinConditionToTrigger = false;

            var coll = GetComponent<BoxCollider>();
            coll.isTrigger = true;

            if (sequenceController == null)
            {
                sequenceController = GetComponentInParent<EndingSequenceController>(true);
                if (sequenceController == null)
                {
                    sequenceController = FindObjectOfType<EndingSequenceController>(true);
                }
            }
        }

        private void OnValidate()
        {
            enabled = true;
            triggerOnCollision = true;
            requireWinConditionToTrigger = false;

            var coll = GetComponent<BoxCollider>();
            if (coll != null) coll.isTrigger = true;

            if (sequenceController == null)
            {
                sequenceController = GetComponentInParent<EndingSequenceController>(true);
                if (sequenceController == null)
                {
                    sequenceController = FindObjectOfType<EndingSequenceController>(true);
                }
            }
        }

        private void OnTriggerEnter(Collider other)
        {
            if (hasTriggered) return;

            if (other.CompareTag(playerTag))
            {
                TriggerSequence();
            }
        }

        /// <summary>
        /// 提供给外部调用的接口，比如 Button OnClick 事件，方便在开发阶段不检查碰撞直接触发
        /// </summary>
        public void TriggerSequence()
        {
            if (hasTriggered) return;
            hasTriggered = true;

            if (!allowManualTriggerWhenLocked && requireWinConditionToTrigger)
            {
                var wc = EndingWinConditionService.EnsureInstance();
                if (wc != null && !wc.CanTriggerEnding)
                {
                    hasTriggered = false;
                    return;
                }
            }

            if (sequenceController == null)
            {
                sequenceController = GetComponentInParent<EndingSequenceController>(true);
                if (sequenceController == null)
                {
                    sequenceController = FindObjectOfType<EndingSequenceController>(true);
                }
            }

            if (sequenceController != null)
            {
                sequenceController.StartEndingSequence();
            }
            else
            {
                Debug.LogError("[EndingTrigger] EndingSequenceController is not assigned!");
            }
        }
    }
}