using UnityEngine;
using UnityEngine.Playables;

/// <summary>
/// ListCourseScreen scene manager
/// </summary>
public class ListCoursesScreen : MonoBehaviour
{
    /// <summary>
    /// Reference to the course-list container object
    /// </summary>
    public Transform courseContainer;

    /// <summary>
    /// Prefab of the course item object
    /// </summary>
    public GameObject courseItemPrefab;

    /// <summary>
    /// Reference to the list of all courses
    /// </summary>
    public CourseList courseList;

    /// <summary>
    /// Reference to the scene playable director
    /// </summary>
    public PlayableDirector directorEnterFromCourseMenu;

    /// <summary>
    /// Start is called before the first frame update
    /// </summary>
    void Start()
    {
        PersistentDataController.GetInstance().Load();
        User user = UserList.GetCurrentUser();

        foreach (Course course in courseList.courses)
        {
            // Create instance of prefab
            GameObject instance = GameObject.Instantiate(courseItemPrefab, courseContainer);

            // Dynamically load appearance
            CourseItem item = instance.GetComponent<CourseItem>();
            item.course = course;

            var progress = user.GetCourseProgress(course.index);
            item.progress = progress != null ? progress.progress : 0.0f;
        }

        var sys = SystemController.GetInstance();
        if (sys.previousScene == SystemController.GetSceneIndex("Common/Scenes/CoursesMenuScreen"))
            directorEnterFromCourseMenu.Play();
    }

    /// <summary>
    /// Method used as callback for course item onClick events
    /// </summary>
    public void GotoCourseInfo()
    {
        SystemController.GetInstance().LoadNextScene("Common/Scenes/CourseActivityScreen");
    }
}