using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;
using System.IO;
using SimpleJSON;

[System.Serializable]
public class JSONManager : Manager
{
    // API Url
    private const string URL = "https://external.api.yle.fi/v1/programs/items.json?";

    //limit of the loaded items
    private const int limit = 10;

    //Search bar
    [SerializeField]
    private Text search;

    //Api data (API key and Api ID)
    [SerializeField]
    private APIData APIInfo;

    //startindex
    [SerializeField]
    private int offset = 0;
    public int Offset
    {
        get
        {
            return offset;
        }
        set
        {
            offset = value;
        }
    }

    private UIManager uiManager
    {
        get
        {
            return GameManager.Instance.GetManager<UIManager>();
        }
    }

    /// <summary>
    /// This function execute when the user click on the search
    /// </summary>
    public void StartRequest()
    {
        GameManager.Instance.GetManager<JSONManager>().Offset = 0;
         GameManager.Instance.StartCoroutine(RequestAPI());
    }

    /// <summary>
    /// Creating the URL.
    /// </summary>
    /// <param name="query">Searching query</param>
    private string CreateUrl(string query, int limit,int offset)
    {
        Debug.Log(offset);
        return URL + "q=" + query + "&offset=" + offset + "&limit=" + limit +"&app_id=" + APIInfo.AppID + "&app_key=" + APIInfo.AppKey;
    }

    /// <summary>
    /// Requestng the Api
    /// </summary>
    /// <returns></returns>
    private IEnumerator RequestAPI()
    {
        //Clear the UI Items
        uiManager.ClearItems();

        //Requesting API
        UnityWebRequest Requesting = UnityWebRequest.Get(CreateUrl(search.text,limit, offset));

        yield return Requesting.Send();
        //check if the request doesnt have errors
        if (!Requesting.isNetworkError || !Requesting.isHttpError || !Requesting.isNetworkError || Requesting != null)
        {
            //Parse the UnityWebRequest to an object.
            JSONNode node = JSONArray.Parse(Requesting.downloadHandler.text).AsObject;

            //checking if the node is find
            if (node == null)
                Debug.Log("NULL");

            //list of 10 items
            List<YleItem> items = new List<YleItem>();

            for (int i = 0; i < node[2].Count; i++)
            {
                //getting the title and description.
                string title = node["data"][i]["title"]["fi"];
                string description = node["data"][i]["description"]["fi"];

                //adding it and making it a object
                items.Add(new YleItem(title, description));
            }

            //Updating the items.
            for (int i = 0; i < node[2].Count; i++)
                uiManager.UpdateItems(items);
        }

        else
        {
            Debug.LogError("Error");
        }
    }
}
/// <summary>
/// all the API data
/// </summary>
[System.Serializable]
public struct APIData
{
    //key 7ebc06e7d154782906d354398eda90d2
    [SerializeField]
    private string appKey;
    public string AppKey
    {
        get
        {
            return appKey;
        }
        set
        {
            appKey = value;
        }
    }

    //id f823fd4b&
    [SerializeField]
    private string appID;
    public string AppID
    {
        get
        {
            return appID;
        }
        set
        {
            appID = value;
        }
    }
}