using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using UnityEngine.UI;
using LitJson;
using System.IO;

public class Inventory : MonoBehaviour
{

    public static Inventory current;

    //public List<InventoryData> iData = new List<InventoryData>();
    [HideInInspector] public InventoryData[] iData = new InventoryData[slotAmount];
    string inventoryJSON;

    public delegate void itemChanged();
    public itemChanged itemChangedCallBack;

    GameObject inventoryPanel;
    public ItemDatabase itemDB;
    public GameObject slotPanel;
    public GameObject inventorySlot;
    public GameObject inventoryItem;

    const int slotAmount = 120;

    [HideInInspector] public int[] itemIDs = new int[slotAmount];
    [HideInInspector] public int[] slotIDs = new int[slotAmount];
    [HideInInspector] public int[] itemAmounts = new int[slotAmount];
    public List<Item> items = new List<Item>();
    public List<GameObject> slots = new List<GameObject>();

    void Awake()
    {
        if (!current)
            current = this;
        else
            Destroy(this);
    }

    public void SaveDatav2()
    {
        for (int i = 0; i < slotAmount; i++)
        {
            int tempID = (items[i] != null) ? items[i].ID : 1;
            itemIDs[i] = tempID;

            /*if (tempID == 1)
            {
                //break;
                itemIDs[i] = tempID;
            }
            else
            {
                itemIDs[i] = tempID;
            }*/
        }

        for (int i = 0; i < items.Count; i++)
        {
            int tempID = -1;

            if (items[i].ID != tempID)
            {
                ItemData data = slots[i].transform.GetChild(0).GetComponent<ItemData>();
                itemAmounts[i] = data.amount;
            }
            else
                continue;
        }

        for (int i = 0; i < slotAmount; i++)
        {
            int tempID = -1;
            if (slots[i].transform.childCount == 1)
                slotIDs[i] = i;
            else
                continue;
        }

        for (int i = 0; i < itemIDs.Length; i++)
        {
            iData[i] = new InventoryData();
            iData[i].itemID = itemIDs[i];
            iData[i].slotID = slotIDs[i];
            iData[i].itemAmount = itemAmounts[i];
        }

        inventoryJSON = JsonHelper.ToJson(iData, true);
        File.WriteAllText(Application.persistentDataPath + "/IData.json", inventoryJSON);
    }

    public void LoadSavedData()
    {
        string path = Application.persistentDataPath + "/IData.json";
        if (!File.Exists(path))
        {
            Debug.Log("No available saves");
        }
        else
        {
            string contents = File.ReadAllText(path);
            InventoryData[] jsonData = JsonHelper.FromJson<InventoryData>(contents);
            for (int i = 0; i < jsonData.Length; i++)
            {
                int itemToAddID = jsonData[i].itemID;
                int itemAmount = jsonData[i].itemAmount;
                int slotID = jsonData[i].slotID;

                if (jsonData[i].itemID == -1)
                    break;
                else
                    AddItem(itemToAddID, slotID);

                if (items[i].ID == itemToAddID)
                {
                    ItemData data = slots[i].transform.GetChild(0).GetComponent<ItemData>();
                    data.amount = itemAmount;
                    data.transform.GetChild(0).GetComponent<Text>().text = data.amount.ToString();
                }
            }
        }
    }

    void Start()
    {
        /*Debug.Log(inventoryJSON);
        File.WriteAllText(Application.dataPath + "/Sample.json", inventoryJSON.ToString());
        Debug.LogFormat("Write to File({0}) -- data:\n{1}", Application.dataPath + "/Sample.json", inventoryJSON);*/

        inventoryPanel = GameObject.Find("Inventory Panel");

        for (int i = 0; i < slotAmount; i++)
        {
            items.Add(new Item());
            slots.Add(Instantiate(inventorySlot));
            slots[i].transform.SetParent(slotPanel.transform);
        }


        //Application.RegisterLogCallback(HandleLog);
        LoadSavedData();
    }

    void HandleLog(string logString, string stackTrace, LogType type)
    {
        if (logString.Length>1000) logString=logString.Substring(0,1000);
        //log.text= logString;
    }

    public void AddItem(int itemID, int slotID)
    {
        Item itemToAdd = itemDB.FetchItemByID(itemID);

        if (itemToAdd.Stackable && IfItemIsInInventory(itemToAdd))
        {
            for (int i = 1; i <= items.Count; i++)
            {
                if (items[slotID].ID == itemID)
                {
                    ItemData data = slots[slotID].transform.GetChild(0).GetComponent<ItemData>();
                    data.amount++;
                    data.transform.GetChild(0).GetComponent<Text>().text = data.amount.ToString();
                    break;
                }
            }
        }
        else
        {
            for (int i = 0; i < items.Count; i++)
            {
                if (items[slotID].ID == -1)
                {
                    items[slotID] = itemToAdd;
                    GameObject itemObj = Instantiate(inventoryItem);
                    itemObj.transform.SetParent(slots[slotID].transform);
                    itemObj.transform.position = Vector2.zero;
                    itemObj.GetComponent<Image>().sprite = itemToAdd.Sprite;
                    itemObj.name = itemToAdd.Title;

                    if (itemChangedCallBack != null)
                        itemChangedCallBack.Invoke();

                    break;
                }

            }
        }
    }

    public void GetItem(int id)
    {
        Item itemToAdd = itemDB.FetchItemByID(id);

        if (itemToAdd.Stackable && IfItemIsInInventory(itemToAdd))
        {
            for (int i = 0; i < items.Count; i++)
            {
                if (items[i].ID == id)
                {
                    ItemData data = slots[i].transform.GetChild(0).GetComponent<ItemData>();
                    data.amount++;
                    data.transform.GetChild(0).GetComponent<Text>().text = data.amount.ToString();
                    break;
                }
            }
        }
        else
        {
            for (int i = 0; i < items.Count; i++)
            {
                if (items[i].ID == -1)
                {
                    items[i] = itemToAdd;
                    GameObject itemObj = Instantiate(inventoryItem);
                    itemObj.transform.SetParent(slots[i].transform);
                    itemObj.transform.position = Vector2.zero;
                    itemObj.GetComponent<Image>().sprite = itemToAdd.Sprite;
                    itemObj.name = itemToAdd.Title;

                    if (itemChangedCallBack != null)
                        itemChangedCallBack.Invoke();

                    break;
                }
            }
        }
    }

    bool IfItemIsInInventory(Item item)
    {
        for (int i = 0; i < items.Count; i++)
        {
            if (items[i].ID == item.ID)
            {
                return true;
            }
        }
        return false;
    }

}//class

[Serializable]
public class InventoryData
{
    public int slotID;
    public int itemID;
    public int itemAmount;
}