using System;
using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.Networking;

public static class Cupid
{
    private static string serverAddress;
    public static string ServerAddress => serverAddress;
    private static string cupidBaseUri;
    public static string CupidURI => cupidBaseUri;

    private static int port;
    public static int Port => port;

    private static string bearerToken;
    public static string BearerToken => bearerToken;
    private static string settingsPassword = "";
    public static string SettingsPassword => settingsPassword;

    private static CupidSettings settings = null;
    public static CupidSettings Settings => settings;

    public static bool isInitialized => settings != null;


    public static int RoomPort = -1;


    public static async Task Init(string _serverAddress, int _port, string _bearerToken, string _settingsPassword)
    {
        if (!TryBuildEndpoints(_serverAddress, _port, out serverAddress, out cupidBaseUri, out port))
        {
            Logger.Log("Cupid: invalid or empty server address.");
            bearerToken = _bearerToken ?? "";
            settings = null;
            return;
        }

        bearerToken = _bearerToken ?? "";

        if (string.IsNullOrEmpty(bearerToken))
        {
            Logger.Log("Cupid: no bearer token; configure auth before matchmaking.");
            settings = null;
            return;
        }

        settingsPassword = _settingsPassword ?? "";
        string settingsUrl = CupidURI + "/settings?password=" + UnityWebRequest.EscapeURL(settingsPassword);
        using (UnityWebRequest www = UnityWebRequest.Get(settingsUrl))
        {
            www.SetRequestHeader("Authorization", "Bearer " + bearerToken);
            var operation = www.SendWebRequest();
            while (!operation.isDone)
            {
                await Task.Yield();
            }

            try
            {
                if (www.result != UnityWebRequest.Result.Success)
                {
                    Logger.Log("Cupid settings request failed: " + www.error);
                    Logger.Log(www.downloadHandler != null ? www.downloadHandler.text : "");
                    settings = null;
                    return;
                }

                string body = www.downloadHandler != null ? www.downloadHandler.text : "";
                if (string.IsNullOrWhiteSpace(body))
                {
                    settings = null;
                    return;
                }

                if (body.Trim() == "403 Unauthorized")
                {
                    Logger.Log("Cupid settings: wrong or missing password query (server rejected /settings).");
                    settings = null;
                    return;
                }

                settings = JsonUtility.FromJson<CupidSettings>(body);
                if (settings == null) { throw new NullReferenceException(); }
                Logger.Log("Cupid init success");
            }
            catch (Exception e)
            {
                Logger.Log("Error retreiving settings from server " + e.Message);
                Logger.Log(www.downloadHandler != null ? www.downloadHandler.text : "");
                settings = null;
            }
        }
    }

    /// <summary>
    /// Plain host/IP + HTTP port, or an absolute URL (https://host with no port uses 443).
    /// Sets <paramref name="hostOnly"/> for game client transport; <paramref name="baseUri"/> has no trailing slash.
    /// </summary>
    static bool TryBuildEndpoints(string input, int fallbackHttpPort, out string hostOnly, out string baseUri, out int resolvedPort)
    {
        hostOnly = "";
        baseUri = "";
        resolvedPort = fallbackHttpPort;
        input = (input ?? "").Trim();
        if (string.IsNullOrEmpty(input))
            return false;

        if (input.IndexOf("://", StringComparison.Ordinal) >= 0
            && Uri.TryCreate(input, UriKind.Absolute, out Uri uri)
            && (uri.Scheme == Uri.UriSchemeHttp || uri.Scheme == Uri.UriSchemeHttps))
        {
            hostOnly = uri.Host;
            string authority = uri.GetLeftPart(UriPartial.Authority);
            string path = uri.AbsolutePath;
            if (!string.IsNullOrEmpty(path) && path != "/")
                baseUri = authority.TrimEnd('/') + path.TrimEnd('/');
            else
                baseUri = authority;
            resolvedPort = uri.Port;
            return true;
        }

        hostOnly = input;
        baseUri = "http://" + input + ":" + fallbackHttpPort;
        resolvedPort = fallbackHttpPort;
        return true;
    }

    
    public static string RandomUsername{
        get{
            string pool="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
            string output ="";
            for(int i=0; i < 5; i++){
                output += pool.ToCharArray()[UnityEngine.Random.Range(0,pool.Length)];
            }

            return output;
        }
    }

    /// <summary>Matchmaker GET / body: <c>"0"</c> while waiting; otherwise a JSON room object.</summary>
    public static CupidRoom? ParseRoom(string data) => ParseRoom(data, 0, null);

    /// <inheritdoc cref="ParseRoom(string)"/>
    /// <param name="currentUserId">Used to pick <c>for_red</c> vs <c>for_blue</c> when both list the same players.</param>
    /// <param name="teamDisambiguation">Optional hint (e.g. <see cref="GameManager.MyTeam"/>) when the roster is duplicated on both sides.</param>
    public static CupidRoom? ParseRoom(string data, int currentUserId, Team? teamDisambiguation)
    {
        if (string.IsNullOrWhiteSpace(data))
            return null;
        string t = data.Trim();
        if (t == "0")
            return null;

        if (t.IndexOf("\"for_red\"", StringComparison.Ordinal) >= 0)
        {
            MatchmadeResponse env = JsonUtility.FromJson<MatchmadeResponse>(t);
            if (env == null || !env.ok || !MatchmadeResponse.IsMatchReady(env))
                return null;
            MatchmadeTeamPayload branch = MatchmadeResponse.SelectTeamPayload(env, currentUserId, teamDisambiguation);
            if (branch == null || branch.Port <= 0)
                return null;
            return ToCupidRoom(branch);
        }

        try
        {
            CupidRoom room = JsonUtility.FromJson<CupidRoom>(t);
            if (room.Port <= 0)
                return null;
            return room;
        }
        catch
        {
            return null;
        }
    }

    static CupidRoom ToCupidRoom(MatchmadeTeamPayload p)
    {
        var room = new CupidRoom
        {
            GameName = p.GameName ?? "",
            Port = p.Port,
            InitTime = p.InitTime,
            match_id = p.match_id,
            your_team = p.your_team ?? ""
        };
        if (p.Players != null)
        {
            room.Players = new CupidQueueEntry[p.Players.Length];
            for (int i = 0; i < p.Players.Length; i++)
            {
                room.Players[i] = new CupidQueueEntry
                {
                    Name = p.Players[i].Name,
                    LastSeen = p.Players[i].LastSeen,
                    UserId = p.Players[i].UserId
                };
            }
        }
        return room;
    }
}

[System.Serializable]
public class CupidSettings
{
    public int minimum_players;
    public int maximum_players;
    public int waiting_time;
}

[System.Serializable]
public struct CupidRoom
{
    public CupidQueueEntry[] Players;
    public string GameName;
    public int Port;
    public long InitTime;
    public int match_id;
    public string your_team;
}

[System.Serializable]
public struct CupidQueueEntry
{
    public string Name;
    public long LastSeen;
    public int UserId;
}