using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;

public class DatabaseController : MonoBehaviour
{

    private string secretKey = "TheNarKampenSecretKey";
    private string questionURL = "http://nordh.xyz:8088/Questions.php?";
    private string categoriesURL = "http://nordh.xyz:8088/Categories.php";
    private string questionCountURL = "http://nordh.xyz:8088/QuestionCount.php";
    private string checkUsernameTakenURL = "http://nordh.xyz:8088/CheckUsername.php";
    private string insertUserURL = "http://nordh.xyz:8088/InsertUser.php";

    public Text statusText;

    private CategoryList categories;

    public CategoryList Categories { get { return categories; } set { categories = value; } }

    public static DatabaseController Instance { get; private set; }

    private void Awake()
    {
        StartCoroutine(getCategories());
        if (Instance != null && Instance != this)
        {
            Destroy(this);
        }
        else
        {
            Instance = this;
        }
    }

    public IEnumerator getCategories()
    {
        UnityWebRequest request = UnityWebRequest.Get(categoriesURL);

        yield return request.SendWebRequest();

        if (request.result == UnityWebRequest.Result.Success)
        {
            Debug.Log(request.downloadHandler.text);
            categories = JsonUtility.FromJson<CategoryList>("{\"list\":" + request.downloadHandler.text + "}");
            Debug.Log("Category count: " + categories.list.Count);
            foreach (Category c in categories.list)
            {
                Debug.Log(c.ToString());
            }
        }
        else if (request.result == UnityWebRequest.Result.ConnectionError || request.result == UnityWebRequest.Result.DataProcessingError)
        {
            Debug.Log("ERROR " + request.downloadHandler.error);
        }
        else
        {
            Debug.Log("OTHER ERROR " + request.responseCode + " " + request.downloadHandler.error);
        }
    }

    public IEnumerator GetRandomQuestion()
    {
        Question question = new Question();

        UnityWebRequest request = new UnityWebRequest(questionURL);
        yield return request.SendWebRequest();

        if (request.error != null)
        {
            print("There was an error getting question: " + request.downloadHandler.error);
        }
        else
        {
            statusText.text = request.downloadHandler.text;
        }
    }

    public string Md5Sum(string strToEncrypt)
    {
        System.Text.UTF8Encoding ue = new System.Text.UTF8Encoding();
        byte[] bytes = ue.GetBytes(strToEncrypt);

        // encrypt bytes
        System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
        byte[] hashBytes = md5.ComputeHash(bytes);

        // Convert the encrypted bytes back to a string (base 16)
        string hashString = "";

        for (int i = 0; i < hashBytes.Length; i++)
        {
            hashString += System.Convert.ToString(hashBytes[i], 16).PadLeft(2, '0');
        }

        return hashString.PadLeft(32, '0');
    }

    public bool CheckUsername(string username)
    {
        WWWForm form = new WWWForm();
        form.AddField("username", username);

        UnityWebRequest request = UnityWebRequest.Post(checkUsernameTakenURL, form);

        request.SendWebRequest();

        if (request.downloadHandler.text == "true")
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    internal void InsertUser(string username, string userId)
    {
        WWWForm form = new WWWForm();
        form.AddField("username", username);
        form.AddField("token", userId);

        UnityWebRequest request = UnityWebRequest.Post(insertUserURL, form);

        request.SendWebRequest();

        if (request.error != null)
        {
            Debug.Log("Something went wrong with local user register... " + request.downloadHandler.error);
        }
    }
}