using DG.Tweening;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using UnityEngine;
using UnityEngine.UI;

public class LevelPanel : MonoBehaviour
{
    private int levelNum = 0;
    private float buttonHeight = 30;
    public TargetUIController.PrimaryButtonType primaryButtonType;
    public GameObject levelButtonPrefab;
    public GameObject hudObj;
    private TargetUIController targetUIController;
    public Vector2 defaultPosition = Vector2.zero;
    public Vector2 targetPosition = Vector2.zero;
    public Vector2 defaultSize = Vector2.zero;
    public Vector2 targetSize = Vector2.zero;
    public bool isFolding = false;
    public bool isExpanding = false;

    private List<Button> levelButtonList = new List<Button>();

    public ReadOnlyCollection<Button> LevelButtonList
    {
        get { return levelButtonList.AsReadOnly(); }
    }

    /// <summary>
    /// Initialize the level panel.
    /// Set the level number, button height, default position and target position.
    /// Create leve buttonInitialize the level buttons.
    /// </summary>
    public void InitLevelPanel(int levelNum, Button parentButton, float buttonHeight = 30)
    {
        targetUIController = hudObj.GetComponent<TargetUIController>();
        // set level panel parameters
        this.levelNum = levelNum;
        this.buttonHeight = buttonHeight;
        defaultSize = new Vector2(parentButton.GetComponent<RectTransform>().sizeDelta.x, 0); ;
        defaultPosition = parentButton.GetComponent<RectTransform>().anchoredPosition;
        targetSize = new Vector2(defaultSize.x, buttonHeight * levelNum);
        targetPosition = new Vector2(-parentButton.GetComponent<RectTransform>().sizeDelta.x,
            parentButton.GetComponent<RectTransform>().anchoredPosition.y + (levelNum - 1) * buttonHeight / 2);
        // limit the target position is screen range
        if (targetPosition.y > 0)
        {
            targetPosition.y = 0;
        }

        // create level buttons
        for (int i = 0; i < levelNum; i++)
        {
            GameObject newButton = Instantiate(levelButtonPrefab, transform);
            levelButtonList.Add(newButton.GetComponent<Button>());
            newButton.GetComponent<LevelButton>().Initialization(i);
            newButton.GetComponent<Button>().onClick.AddListener(delegate { targetUIController.LevelButtonPressed(primaryButtonType, newButton.GetComponent<LevelButton>().level); });
        }
        // fold panel to default position immediately
        FoldLevelPanel();
    }

    /// <summary>
    /// fold the level panel.
    /// </summary>
    /// <param name="animeTime">fold animation time,0 without animation</param>
    public void FoldLevelPanel(float animeTime = 0)
    {
        isFolding = true;
        DOTween.To(() => gameObject.GetComponent<RectTransform>().anchoredPosition,
            x => gameObject.GetComponent<RectTransform>().anchoredPosition = x,
            defaultPosition,
            animeTime).SetEase(Ease.OutCirc).Play().OnComplete(() => isFolding = false);
        DOTween.To(() => gameObject.GetComponent<RectTransform>().sizeDelta,
            x => gameObject.GetComponent<RectTransform>().sizeDelta = x,
            defaultSize,
            animeTime).SetEase(Ease.OutCirc).Play();
    }

    /// <summary>
    /// expand the level panel.
    /// </summary>
    /// <param name="animeTime">expand animation time,0 without animation</param>
    public void ExpandLevelPanel(float animeTime = 0)
    {
        isExpanding = true;
        DOTween.To(() => gameObject.GetComponent<RectTransform>().anchoredPosition,
            x => gameObject.GetComponent<RectTransform>().anchoredPosition = x,
            targetPosition,
            animeTime).SetEase(Ease.OutCirc).Play().OnComplete(() => isExpanding = false);
        DOTween.To(() => gameObject.GetComponent<RectTransform>().sizeDelta,
            x => gameObject.GetComponent<RectTransform>().sizeDelta = x,
            targetSize,
            animeTime).SetEase(Ease.OutCirc).Play();
    }
}