using System;
using UnityEngine;

/// <summary>
/// Handles level switching when interacted with. Applies switch data and triggers scene transitions.
/// </summary>
public class LevelSwitch : MonoBehaviour
{
    /// <summary>
    /// Data for this level switch (target scene, icon, etc).
    /// </summary>
    public LevelSwitchData switchData;
    /// <summary>
    /// Renderer for the switch icon.
    /// </summary>
    public SpriteRenderer iconRenderer;
    private Interactable interactable;

    private bool _isActive = true;

    /// <summary>
    /// Unity Awake callback. Sets up icon, interactable, and event handlers.
    /// </summary>
    void Awake()
    {
        _isActive = true;
        if (iconRenderer == null)
            iconRenderer = GetComponent<SpriteRenderer>();
        interactable = GetComponent<Interactable>();
        if (interactable != null)
        {
            interactable.StartedInteraction += OnStartedInteraction;
        }
        ApplySwitchData();
    }

    /// <summary>
    /// Unity OnDestroy callback. Cleans up event handlers.
    /// </summary>
    void OnDestroy()
    {
        if (interactable != null)
        {
            interactable.StartedInteraction -= OnStartedInteraction;
        }
    }

#if UNITY_EDITOR
    /// <summary>
    /// Unity OnValidate callback. Ensures icon and data are up to date in editor.
    /// </summary>
    void OnValidate()
    {
        if (iconRenderer == null)
            iconRenderer = GetComponent<SpriteRenderer>();
        ApplySwitchData();
    }
#endif

    /// <summary>
    /// Applies the switch data to the level switch (icon, name, etc).
    /// </summary>
    public void ApplySwitchData()
    {
        if (switchData != null)
        {
            if (iconRenderer != null)
                iconRenderer.sprite = switchData.mapSprite;
            gameObject.name = switchData.targetLevelSceneName;
            // Optionally update other fields, e.g. description
        }
    }

    /// <summary>
    /// Handles the start of an interaction (switches the level if active).
    /// </summary>
    private async void OnStartedInteraction()
    {
        Debug.Log($"LevelSwitch.OnInteracted: Switching to level {switchData?.targetLevelSceneName}");
        if (switchData != null && !string.IsNullOrEmpty(switchData.targetLevelSceneName) && _isActive)
        {
            // Optionally: show loading UI here
            var progress = new Progress<float>(p => Debug.Log($"Loading progress: {p * 100:F0}%"));
            await SceneManagerService.Instance.SwitchSceneAsync(switchData.targetLevelSceneName, progress);
            _isActive = false;
            // Optionally: hide loading UI here
        }
    }
}