using System.Reflection;
using System.Text.Json;
using System.Text.Json.Nodes;
using HarmonyLib;
using SPTarkov.Reflection.Patching;
using SPTarkov.Server.Core.Routers;
using SPTarkov.Server.Core.Models.Common;
using SPTarkov.Server.Core.Models.Eft.Launcher;
using SPTarkov.Server.Core.Callbacks;
using SPTarkov.Server.Core.Controllers;
using System.Threading;

namespace PersonalAuthMod;

/// <summary>
///     AsyncLocal to pass the password from the patch to the router
/// </summary>
public static class AuthContext
{
    private static readonly AsyncLocal<string?> _currentPassword = new();
    private static readonly AsyncLocal<string?> _currentSessionID = new();

    public static string? CurrentPassword
    {
        get => _currentPassword.Value;
        set => _currentPassword.Value = value;
    }

    public static string? CurrentSessionID
    {
        get => _currentSessionID.Value;
        set => _currentSessionID.Value = value;
    }
}

/// <summary>
///     Patch HttpRouter.HandleRoute to capture session ID and extract password globally.
/// </summary>
public class HttpRouterHandleRoutePatch : AbstractPatch
{
    protected override MethodBase GetTargetMethod()
    {
        return typeof(HttpRouter).GetMethod("HandleRoute", BindingFlags.NonPublic | BindingFlags.Instance)!;
    }

    [PatchPrefix]
    public static void Prefix(MongoId sessionID, ref string? body)
    {
        // Capture the session ID for other patches (like profile filtering)
        AuthContext.CurrentSessionID = sessionID.ToString();

        if (string.IsNullOrEmpty(body))
        {
            return;
        }

        if (!body.Contains("\"password\""))
        {
            return;
        }

        try
        {
            var node = JsonNode.Parse(body);
            if (node is JsonObject obj && obj.TryGetPropertyValue("password", out var passwordNode))
            {
                AuthContext.CurrentPassword = passwordNode?.GetValue<string>();
                obj.Remove("password");
                body = obj.ToJsonString();
            }
        }
        catch
        {
        }
    }
}

/// <summary>
///     Patch ProfileController.GetMiniProfiles to filter the list based on the authenticated user.
/// </summary>
public class ProfileControllerGetMiniProfilesPatch : AbstractPatch
{
    protected override MethodBase GetTargetMethod()
    {
        return typeof(ProfileController).GetMethod(nameof(ProfileController.GetMiniProfiles))!;
    }

    [PatchPostfix]
    public static void Postfix(ref List<MiniProfile> __result)
    {
        var sessionID = AuthContext.CurrentSessionID;
        if (string.IsNullOrEmpty(sessionID) || __result == null)
        {
            return;
        }

        var dbManager = PersonalAuthMod.Instance?.DbManager;
        if (dbManager == null || !dbManager.ValidateSession(sessionID))
        {
            // If session is invalid, return empty list (isolation)
            __result = new List<MiniProfile>();
            return;
        }

        var username = dbManager.GetUsernameBySession(sessionID);
        if (string.IsNullOrEmpty(username))
        {
            __result = new List<MiniProfile>();
            return;
        }

        // Filter the list to only include the user's own profile
        int before = __result.Count;
        __result = __result.Where(p => p.Username == username).ToList();
        
        if (before != __result.Count)
        {
            Console.WriteLine($"[PersonalAuthMod] Isolated profiles for {username}: {before} -> {__result.Count}");
        }
    }
}

/// <summary>
///     Patch LauncherCallbacks.Login to enforce database authentication.
/// </summary>
public class LauncherCallbacksLoginPatch : AbstractPatch
{
    protected override MethodBase GetTargetMethod()
    {
        return typeof(LauncherCallbacks).GetMethod(nameof(LauncherCallbacks.Login))!;
    }

    [PatchPrefix]
    public static bool Prefix(string url, LoginRequestData info, MongoId sessionID, ref ValueTask<string> __result)
    {
        var password = AuthContext.CurrentPassword;
        Console.WriteLine($"[PersonalAuthMod] Login Patch - User: {info.Username}, Password provided? {!string.IsNullOrEmpty(password)}");
        
        if (string.IsNullOrWhiteSpace(info.Username) || string.IsNullOrWhiteSpace(password))
        {
            __result = new ValueTask<string>("FAILED");
            return false; // Skip original method
        }

        var sessionId = PersonalAuthMod.Instance?.DbManager.LoginUser(info.Username, password);
        if (sessionId == null)
        {
            Console.WriteLine($"[PersonalAuthMod] Login FAILED for user: {info.Username}");
            __result = new ValueTask<string>("FAILED");
            return false; // Skip original method
        }

        Console.WriteLine($"[PersonalAuthMod] Login SUCCESS for user: {info.Username}, Session: {sessionId}");
        __result = new ValueTask<string>(sessionId);
        return false; // Skip original method
    }
}

/// <summary>
///     Patch LauncherCallbacks.Register to enforce database registration.
/// </summary>
public class LauncherCallbacksRegisterPatch : AbstractPatch
{
    protected override MethodBase GetTargetMethod()
    {
        return typeof(LauncherCallbacks).GetMethod(nameof(LauncherCallbacks.Register))!;
    }

    [PatchPrefix]
    public static bool Prefix(string url, RegisterData info, MongoId sessionID, ref ValueTask<string> __result)
    {
        var password = AuthContext.CurrentPassword;
        Console.WriteLine($"[PersonalAuthMod] Register Patch - User: {info.Username}, Password provided? {!string.IsNullOrEmpty(password)}");

        if (string.IsNullOrWhiteSpace(info.Username) || string.IsNullOrWhiteSpace(password))
        {
            __result = new ValueTask<string>("FAILED");
            return false; // Skip original method
        }

        if (PersonalAuthMod.Instance?.DbManager.RegisterUser(info.Username, password) == false)
        {
            Console.WriteLine($"[PersonalAuthMod] Register FAILED for user: {info.Username} (Already exists or DB error)");
            __result = new ValueTask<string>("FAILED");
            return false; // Skip original method
        }

        Console.WriteLine($"[PersonalAuthMod] Register SUCCESS for user: {info.Username}");
        // Allow original method to run (it will create the local profile)
        return true; 
    }
}