using UnityEngine;
using UnityEngine.UIElements;

public static class Collider2DHelper
{
    public static Vector2 TopCenter(this Collider2D collider)
    {
        Vector2 center = collider.bounds.center;
        Vector2 extents = collider.bounds.extents; // half-size

        return new Vector2(center.x, center.y + extents.y);
    }
}

[RequireComponent(typeof(Collider2D))]
[RequireComponent(typeof(ResourceSource))]
[RequireComponent(typeof(UIDocument))]
[RequireComponent(typeof(ResourceGenerator))]
public class FactoryInfo : MonoBehaviour
{
    [SerializeField()]
    private new Camera camera;

    [SerializeField]
    private string title;

    private new Collider2D collider;
    private ResourceSource source;
    private ResourceGenerator generator;
    private UIDocument uiDocument;
    private VisualElement rootElement;
    private VisualElement panelElement;
    private Label titleLabel;
    private ProgressBar progressBar;

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        collider = GetComponent<Collider2D>();
        source = GetComponent<ResourceSource>();
        generator = GetComponent<ResourceGenerator>();

        uiDocument = GetComponent<UIDocument>();
        rootElement = uiDocument.rootVisualElement;

        panelElement = rootElement.Q<VisualElement>("Panel");
        titleLabel = rootElement.Q<Label>("Title");
        progressBar = rootElement.Q<ProgressBar>("Progress");
    }

    [ExecuteInEditMode]
    void Update()
    {
        if (panelElement != null)
        {
            Vector3 screenPos = camera.WorldToScreenPoint(collider.TopCenter());
            panelElement.style.left = screenPos.x;
            panelElement.style.top = Screen.height - screenPos.y;
        }
        else
            Debug.Log("No panel");

        titleLabel.text = title;
        progressBar.title = source?.Resource.Name;
        progressBar.value = generator.Progress * 100;
    }
}