// Assets/_Project/Scripts/Combat/TowerFallingSound.cs
using TD.Audio;
using TD.Gameplay;
using UnityEngine;

namespace TD.Combat
{
    /// <summary>
    /// Local-only audio for the tower falling from the sky. Attached to
    /// <see cref="BuildSiteVisual"/> (not <see cref="TowerInstance"/>, which doesn't exist
    /// yet) and polled every frame: plays a sound on every peer once construction has
    /// <see cref="triggerSecondsBeforeCompletion"/> seconds or less remaining, so the whoosh
    /// leads the tower's actual fall/land animation (see <see cref="TowerLandingVisual"/>,
    /// which starts once <see cref="BuildSiteVisual"/> is replaced by the real
    /// <see cref="TowerInstance"/> at construction-complete).
    /// </summary>
    [RequireComponent(typeof(BuildSiteVisual))]
    public class TowerFallingSound : MonoBehaviour
    {
        [SerializeField] private SoundConfig fallingSound;

        [Tooltip("Sound fires once remaining construction time drops to this many seconds " +
                 "or less.")]
        [SerializeField] private float triggerSecondsBeforeCompletion = 1f;

        private BuildSiteVisual buildSiteVisual;
        private bool played;

        private void Awake()
        {
            buildSiteVisual = GetComponent<BuildSiteVisual>();
        }

        private void Update()
        {
            if (played || buildSiteVisual == null) return;
            if (buildSiteVisual.CurrentStage != BuildStage.Constructing) return;

            if (buildSiteVisual.ComputeRemainingSeconds() <= triggerSecondsBeforeCompletion)
            {
                played = true;
                AudioManager.Instance?.Play(fallingSound.clip, AudioCategory.UI, fallingSound.RandomPitch(), fallingSound.volume);
            }
        }
    }
}