using UnityEngine;
using Newtonsoft.Json;
using UnityEngine.Networking;
using System.Threading.Tasks;
using System.Collections.Generic;
using Newtonsoft.Json.Linq;

public static class APIRequestHandler
{
    /// <summary>
    /// Method requests given URL and returns as Object of given Type T.
    /// </summary>
    /// <param name="uri">The URL to request.</param>
    /// <returns>T</returns>
    public static async Task<T> GetRequest<T>(string uri)
    {
        using UnityWebRequest webRequest = UnityWebRequest.Get(uri);
        Debug.Log($"Requesting URL {uri}");
        webRequest.SendWebRequest();

        while(!webRequest.isDone)
        {
            if(!Application.isPlaying)
            {
                Debug.LogWarning("Request sent while Application is not playing!");
                return default;
            }//if end

            await Task.Yield();
        }//loop end

        string[] pages = uri.Split('/');
        int page = pages.Length - 1;
        
        switch (webRequest.result)
        {
            case UnityWebRequest.Result.ConnectionError:
            case UnityWebRequest.Result.DataProcessingError:
                Debug.LogError(pages[page] + ": Error: " + webRequest.error);
                break;
            case UnityWebRequest.Result.ProtocolError:
                Debug.LogError(pages[page] + ": HTTP Error: " + webRequest.error);
                break;
            case UnityWebRequest.Result.Success:
                T temp = default;
                Debug.Log(pages[page] + ":\nReceived: " + webRequest.downloadHandler.text);
                return temp = JsonConvert.DeserializeObject<T>(webRequest.downloadHandler.text);
        }//switch end
        return default;
    }//GetRequest() end

    /// <summary>
    /// Method requests given URL and returns as a List Objects of given Type T.
    /// </summary>
    /// <param name="uri">The URL to request.</param>
    /// <returns>List<T></returns>
    public static async Task<List<T>> GetRequestList<T>(string uri)
    {
        using UnityWebRequest webRequest = UnityWebRequest.Get(uri);
        Debug.Log($"Requesting URL {uri}");
        webRequest.SendWebRequest();

        while(!webRequest.isDone)
        {
            if(!Application.isPlaying)
            {
                Debug.LogWarning("Request sent while Application is not playing!");
                return null;
            }//if end

            await Task.Yield();
        }//loop end

        string[] pages = uri.Split('/');
        int page = pages.Length - 1;

        switch (webRequest.result)
        {
            case UnityWebRequest.Result.ConnectionError:
            case UnityWebRequest.Result.DataProcessingError:
                Debug.LogError(pages[page] + ": Error: " + webRequest.error);
                return null;
            case UnityWebRequest.Result.ProtocolError:
                Debug.LogError(pages[page] + ": HTTP Error: " + webRequest.error);
                break;
            case UnityWebRequest.Result.Success:
                Debug.Log(pages[page] + ":\nReceived: " + webRequest.downloadHandler.text);
                
                // SerializableList<T> dataLoader = JsonUtility.FromJson<SerializableList<T>>(webRequest.downloadHandler.text);
                SerializableList<T> dataLoader = JsonConvert.DeserializeObject<SerializableList<T>>(webRequest.downloadHandler.text);
                return dataLoader.list;
        }//switch end
        return null;
    }//GetRequestList() end

    /// <summary>
    /// Method requests given URL and return downloaded media as Sprite.
    /// </summary>
    /// <param name="uri">The URL to get media from.</param>
    /// <returns>Sprite</returns>
    public static async Task<Sprite> GetMedia(string uri)
    {
        Debug.Log($"Requesting URL {uri}");
        UnityWebRequest webRequest = UnityWebRequestTexture.GetTexture(uri);
        webRequest.SendWebRequest();

        while(!webRequest.isDone)
        {
            if(!Application.isPlaying)
            {
                Debug.LogWarning("Request sent while Application is not playing!");
                return null;
            }//if end

            await Task.Yield();
        }//loop end
        
        switch (webRequest.result)
        {
            case UnityWebRequest.Result.ConnectionError:
            case UnityWebRequest.Result.DataProcessingError:
                Debug.LogError(": Error: " + webRequest.error);
                break;
            case UnityWebRequest.Result.ProtocolError:
                Debug.LogError(": HTTP Error: " + webRequest.error);
                break;
            case UnityWebRequest.Result.Success:
                Texture2D tex = ((DownloadHandlerTexture)webRequest.downloadHandler).texture;
                return Sprite.Create(tex, new Rect(0, 0, tex.width, tex.height), Vector2.zero);
        }//switch end
        return null;
    }//GetMedia() end

}//class end