using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using Assets.Scripts;
using UnityEngine.UI;
using UnityEngine.Events;

public class InventoryHandler : MonoBehaviour {
    public List<InventoryItem> _inventory = new List<InventoryItem>();
    public ObjectInteractor interactor;
    public Font font;
    private List<GameObject> _items = new List<GameObject>();
    private List<Text> _text = new List<Text>();
    // Use this for initialization
    void Start() {
        interactor = FindObjectOfType<ObjectInteractor>();
    }

    // Update is called once per frame
    void FixedUpdate() {
        if (_inventory.Count != _items.Count) {
            Refresh();
        }
        for (int i = 0; i < _text.Count; i++) {
            if (_text[i].text != _inventory[i].InventoryName) {
                Refresh();
                break;
            }
        }
    }

    public void Refresh() {
        for (int i = _items.Count - 1; i >= 0; i--) {
            if (_items[i] != null) {
                Destroy(_items[i]);
                Destroy(_text[i]);
            }
        }
        _items.Clear();
        _text.Clear();
        int count = 0;
        for (int y = 0; y < Mathf.CeilToInt((float) _inventory.Count / 4f); y++) {
            for (int x = 0; x < 4; x++) {
                if (count < _inventory.Count) {
                    GameObject item = new GameObject("button", typeof(RectTransform));
                    Button button = item.AddComponent<Button>();
                    item.AddComponent<CanvasRenderer>();
                    Image image = item.AddComponent<Image>();
                    item.transform.SetParent(transform, false);
                    image.sprite = Sprite.Create(_inventory[count].InventoryImage, new Rect(0, 0, 100, 100), new Vector2(0, 0));
                    image.rectTransform.sizeDelta = new Vector2(50, 50);
                    image.rectTransform.anchoredPosition = new Vector2(x * 50 - 75, -y * 50 + 150);
                    InventoryItem currentInventoryItem = _inventory[count];
                    UnityAction action = new UnityAction(delegate {
                        if (_inventory.Count > 0) {
                            InventoryItem inventoryItem = currentInventoryItem;
                            switch (inventoryItem.Type) {
                                case InventoryItem.CategoryType.Equipment:
                                    interactor.currentItem = inventoryItem;
                                    interactor.lockInventory = false;
                                    FindObjectOfType<Canvas>().enabled = false;
                                    break;
                                case InventoryItem.CategoryType.Paper:
                                    inventoryItem.Use();
                                    break;
                                case InventoryItem.CategoryType.Item:
                                    inventoryItem.Use();
                                    break;
                            }
                        }
                    });
                    button.onClick.AddListener(action);
                    GameObject textItem = new GameObject("text", typeof(RectTransform));
                    Text text = textItem.AddComponent<Text>();
                    textItem.transform.SetParent(button.transform, false);
                    text.rectTransform.anchorMax = new Vector2(1, 1);
                    text.rectTransform.anchorMin = new Vector2(0, 0);
                    text.rectTransform.sizeDelta = new Vector2(5, 0);
                    text.rectTransform.anchoredPosition = new Vector2(2f, 0);
                    text.text = currentInventoryItem.InventoryName;
                    text.font = font;
                    text.color = Color.black;
                    text.fontSize = 12;
                    _text.Add(text);
                    _items.Add(item);
                    count++;
                } else {
                    break;
                }
            }
        }
    }
}