using System;

using System.Collections.Generic;
using System.Threading.Tasks;
using Newtonsoft.Json;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.Networking;
using System.Net;
using System.Net.Sockets;
public class DBmanager : MonoBehaviour
{
    public static string phpRoot = "http://38.242.232.13/upf/";

    public static string username = null;

    private static float level = 0;
    private static int xp = 0;
    private static int coins = 0;
    private static int gems = 0;
    private static int metal = 0;
    private static int oxygen = 0;
    private static List<int> expPassCollected = new List<int>();
    public static List<BuildingState> buildingStates = new List<BuildingState>();
    public static UnityEvent OnStateChanged = new UnityEvent();

    public static int Xp => xp;
    public static int Coins => coins;
    public static int Gems => gems;
    public static int Metal => metal;
    public static int Oxygen => oxygen;
    public static float Level => level;
    public static int LevelInt => Mathf.CeilToInt(level);
    public static List<int> ExpPassCollected => expPassCollected;


    public static bool LoggedIn { get { return username != null; } }
    public static void LogOut()
    {
        username = null;
    }

    public static DateTime GetNetworkTime()
    {
        //default Windows time server
        const string ntpServer = "time.windows.com";

        // NTP message size - 16 bytes of the digest (RFC 2030)
        var ntpData = new byte[48];

        //Setting the Leap Indicator, Version Number and Mode values
        ntpData[0] = 0x1B; //LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode)

        var addresses = Dns.GetHostEntry(ntpServer).AddressList;

        //The UDP port number assigned to NTP is 123
        var ipEndPoint = new IPEndPoint(addresses[0], 123);
        //NTP uses UDP

        using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
        {
            socket.Connect(ipEndPoint);

            //Stops code hang if NTP is blocked
            socket.ReceiveTimeout = 3000;

            socket.Send(ntpData);
            socket.Receive(ntpData);
            socket.Close();
        }

        //Offset to get to the "Transmit Timestamp" field (time at which the reply
        //departed the server for the client, in 64-bit timestamp format."
        const byte serverReplyTime = 40;

        //Get the seconds part
        ulong intPart = BitConverter.ToUInt32(ntpData, serverReplyTime);

        //Get the seconds fraction
        ulong fractPart = BitConverter.ToUInt32(ntpData, serverReplyTime + 4);

        //Convert From big-endian to little-endian
        intPart = SwapEndianness(intPart);
        fractPart = SwapEndianness(fractPart);

        var milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000L);

        //**UTC** time
        var networkDateTime = (new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddMilliseconds((long)milliseconds);

        return networkDateTime.ToLocalTime();
    }


    static uint SwapEndianness(ulong x)
    {
        return (uint)(((x & 0x000000ff) << 24) +
        ((x & 0x0000ff00) << 8) +
        ((x & 0x00ff0000) >> 8) +
        ((x & 0xff000000) >> 24));
    }

    public async static Task SetXp(int newValue, bool justOffline = false)
    {
        WWWForm form = new WWWForm();
        form.AddField("name", username);
        form.AddField("xp", newValue);
        if (justOffline) { xp = newValue; }
        else
        {
            using (UnityWebRequest www = UnityWebRequest.Post(phpRoot + "set_xp.php", form))
            {
                var operation = www.SendWebRequest();
                while (!operation.isDone)
                {
                    await Task.Yield();
                }

                if (www.downloadHandler.text == "0")
                {
                    xp = newValue;
                    // Debug
                }
                else
                {
                    Debug.Log("Response : " + www.downloadHandler.text);
                    Debug.LogWarning("Failed to set xp to " + newValue);
                }
            }
        }

        //        for(int i =0; i < xp / 100; i++){
        //            i
        //        }
       
        level = (Mathf.Sqrt((float)Mathf.Clamp(xp,100,float.PositiveInfinity) / 100f));
        if(level == LevelInt){
            level-=0.1f;
        }
        Debug.Log("Level : " + (float)xp / 100f + " : " + level + " : " + LevelInt);
        GameManagerInstance.gameManager.RefreshData();
        OnStateChanged.Invoke();
    }

    public async static Task SetCoins(int newValue, bool justOffline = false)
    {
        WWWForm form = new WWWForm();
        form.AddField("name", username);
        form.AddField("coins", newValue);
        if (justOffline) { coins = newValue; return; }
        using (UnityWebRequest www = UnityWebRequest.Post(phpRoot + "set_coins.php", form))
        {
            var operation = www.SendWebRequest();
            while (!operation.isDone)
            {
                await Task.Yield();
            }

            if (www.downloadHandler.text == "0")
            {
                coins = newValue;
            }
            else
            {
                Debug.Log("Response : " + www.downloadHandler.text);
                Debug.LogWarning("Failed to set coins to " + newValue);
            }
        }

        GameManagerInstance.gameManager.RefreshData();
        OnStateChanged.Invoke();
    }

    public async static void SetGems(int newValue, bool justOffline = false)
    {
        WWWForm form = new WWWForm();
        form.AddField("name", username);
        form.AddField("gems", newValue);
        if (justOffline) { gems = newValue; return; }
        using (UnityWebRequest www = UnityWebRequest.Post(phpRoot + "set_gems.php", form))
        {
            var operation = www.SendWebRequest();
            while (!operation.isDone)
            {
                await Task.Yield();
            }

            if (www.downloadHandler.text == "0")
            {
                gems = newValue;
            }
            else
            {
                Debug.Log("Response : " + www.downloadHandler.text);
                Debug.LogWarning("Failed to set gems to " + newValue);
            }
        }

        GameManagerInstance.gameManager.RefreshData();
        OnStateChanged.Invoke();
    }

    public async static void SetMetal(int newValue, bool justOffline = false)
    {
        WWWForm form = new WWWForm();
        form.AddField("name", username);
        form.AddField("metal", newValue);
        if (justOffline) { metal = newValue; return; }
        using (UnityWebRequest www = UnityWebRequest.Post(phpRoot + "set_metal.php", form))
        {
            var operation = www.SendWebRequest();
            while (!operation.isDone)
            {
                await Task.Yield();
            }

            if (www.downloadHandler.text == "0")
            {
                metal = newValue;
            }
            else
            {
                Debug.Log("Response : " + www.downloadHandler.text);
                Debug.LogWarning("Failed to set metal to " + newValue);
            }
        }

        GameManagerInstance.gameManager.RefreshData();
        OnStateChanged.Invoke();
    }

    public async static void SetOxygen(int newValue, bool justOffline = false)
    {
        WWWForm form = new WWWForm();
        form.AddField("name", username);
        form.AddField("oxygen", newValue);
        if (justOffline) { oxygen = newValue; return; }
        using (UnityWebRequest www = UnityWebRequest.Post(phpRoot + "set_oxygen.php", form))
        {
            var operation = www.SendWebRequest();
            while (!operation.isDone)
            {
                await Task.Yield();
            }

            if (www.downloadHandler.text == "0")
            {
                oxygen = newValue;
            }
            else
            {
                Debug.Log("Response : " + www.downloadHandler.text);
                Debug.LogWarning("Failed to set oxygen to " + newValue);
            }
        }

        GameManagerInstance.gameManager.RefreshData();
        OnStateChanged.Invoke();
    }

    public static void SetExpPassCollected(string rawData, bool justOffline = false)
    {
        string[] data = rawData.Split(',');
        expPassCollected = new List<int>();
        foreach(string item in data){
            try{
                int itemVal = int.Parse(item);
                expPassCollected.Add(itemVal);
            }catch {

            }
        }

        GameManagerInstance.gameManager.RefreshData();
        OnStateChanged.Invoke();
    }

    public async static void AddCollectedExpPass(int newPassLevel)
    {
        expPassCollected.Add(newPassLevel);
        string output = "";
        for(int i =0;i < expPassCollected.Count;i++){
            output += expPassCollected[i].ToString();
            if(i < expPassCollected.Count -1){
                output += ",";
            }
        }

        WWWForm form = new WWWForm();
        form.AddField("name", username);
        form.AddField("expPass", output);
        using (UnityWebRequest www = UnityWebRequest.Post(phpRoot + "set_expPassCollected.php", form))
        {
            var operation = www.SendWebRequest();
            while (!operation.isDone)
            {
                await Task.Yield();
            }

            if (www.downloadHandler.text == "0")
            {
                Debug.Log("Success updating ExpPassCollected");
            }
            else
            {
                Debug.Log("Response : " + www.downloadHandler.text);
                Debug.LogWarning("Failed to set exp_pass_collected to " + output);
            }
        }

        GameManagerInstance.gameManager.RefreshData();
        OnStateChanged.Invoke();
    }

    public static bool GetBuildingStates(string rawData)
    {
        bool success = false;
        //try{

        buildingStates = JsonConvert.DeserializeObject<List<BuildingState>>(rawData);
        Debug.Log("Updating buildings data, isNull: " + (buildingStates == null).ToString());
        if (buildingStates == null)
        {
            buildingStates = new List<BuildingState>();
        }
        success = true;
        //        }catch(Exception e){
        //            Debug.LogError(e.Message+'\n' + e.StackTrace);
        //
        //            Debug.LogError("Error updating buildings from server, Response:" + rawData);
        //            success=false;
        //        }

        OnStateChanged.Invoke();
        return success;
    }

    public async static Task AddBuilding(BuildingData buildingData)
    {

        foreach (BuildingState buildingState in buildingStates)
        {
            if (buildingState.id == buildingData.buildingName)
            {
                Debug.LogError("Building already exists. Cannot add " + buildingState.id);
                return;
            }
        }
        Debug.Log("adding new building " + buildingData.buildingName);
        buildingStates.Add(new BuildingState(buildingData.buildingName, 0, Vector3.zero, GetNetworkTime()));
        Debug.Log("Added new building " + buildingData.buildingName);
        await UpdateBuildingsToServer();
        OnStateChanged.Invoke();
        SetXp(xp + buildingData.levels[0].xpGain);
    }

    public async static Task UpgradeBuilding(string id, int newLevel)
    {
        for (int i = 0; i < buildingStates.Count; i++)
        {
            if (buildingStates[i].id == id)
            {
                buildingStates[i].level = newLevel;
                Debug.Log("Upgrading " + id + " to " + newLevel);
                break;
            }
        }

        await UpdateBuildingsToServer();

        OnStateChanged.Invoke();
    }


    public async static Task CollectBuilding(string id)
    {
        for (int i = 0; i < buildingStates.Count; i++)
        {
            if (buildingStates[i].id == id)
            {
                buildingStates[i].lastCollectedTimestamp = GetNetworkTime();
                Debug.Log("Setting " + id + " last collected to " + buildingStates[i].lastCollectedTimestamp);
                break;
            }
        }

        await UpdateBuildingsToServer();

        OnStateChanged.Invoke();
    }

    public async static Task RelocateBuilding(string id, Vector3 newPosition)
    {
        for (int i = 0; i < buildingStates.Count; i++)
        {
            if (buildingStates[i].id == id)
            {
                buildingStates[i].position = newPosition;
                Debug.Log("Relocating " + id + " to " + newPosition);
                // break;
            }
        }
        Debug.Log("Going to update to server" + JsonConvert.SerializeObject(buildingStates));
        await UpdateBuildingsToServer();

        OnStateChanged.Invoke();
    }

    public async static Task UpdateBuildingsToServer()
    {
        string buildingsJson = JsonConvert.SerializeObject(buildingStates);
        Debug.Log(buildingsJson);

        WWWForm form = new WWWForm();
        form.AddField("name", username);
        form.AddField("buildings", buildingsJson);

        using (UnityWebRequest www = UnityWebRequest.Post(phpRoot + "set_buildings.php", form))
        {
            var operation = www.SendWebRequest();
            while (!operation.isDone)
            {
                await Task.Yield();
            }

            if (www.downloadHandler.text == "0")
            {

            }
            else
            {
                Debug.Log("Response : " + www.downloadHandler.text);
                Debug.LogWarning("Failed to set buildings to " + buildingsJson);
            }
        }
    }

}