// (c) Copyright Ascensio System SIA 2010-2022
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
// any third-party rights.
//
// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For details, see
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
//
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
//
// The  interactive user interfaces in modified source and object code versions of the Program must
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
//
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
//
// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode

/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/

namespace ASC.ApiSystem.Controllers;

[Scope]
public class CommonMethods
{
    private IHttpContextAccessor HttpContextAccessor { get; }

    private IConfiguration Configuration { get; }

    private ILogger<CommonMethods> Log { get; }

    private CoreSettings CoreSettings { get; }

    private CommonLinkUtility CommonLinkUtility { get; }

    private EmailValidationKeyProvider EmailValidationKeyProvider { get; }

    private TimeZoneConverter TimeZoneConverter { get; }

    private CommonConstants CommonConstants { get; }

    private HostedSolution HostedSolution { get; }

    private IMemoryCache MemoryCache { get; }

    private CoreBaseSettings CoreBaseSettings { get; }

    private TenantManager TenantManager { get; }

    private IHttpClientFactory ClientFactory { get; }

    public CommonMethods(
        IHttpContextAccessor httpContextAccessor,
        IConfiguration configuration,
        ILogger<CommonMethods> log,
        CoreSettings coreSettings,
        CommonLinkUtility commonLinkUtility,
        EmailValidationKeyProvider emailValidationKeyProvider,
        TimeZoneConverter timeZoneConverter, CommonConstants commonConstants,
        IMemoryCache memoryCache,
        HostedSolution hostedSolution,
        CoreBaseSettings coreBaseSettings,
        TenantManager tenantManager,
        IHttpClientFactory clientFactory)
    {
        HttpContextAccessor = httpContextAccessor;

        Configuration = configuration;

        Log = log;

        CoreSettings = coreSettings;

        CommonLinkUtility = commonLinkUtility;

        EmailValidationKeyProvider = emailValidationKeyProvider;

        TimeZoneConverter = timeZoneConverter;

        CommonConstants = commonConstants;

        MemoryCache = memoryCache;

        CoreBaseSettings = coreBaseSettings;

        TenantManager = tenantManager;

        ClientFactory = clientFactory;

        HostedSolution = hostedSolution;
        HostedSolution.Init(CommonConstants.BaseDbConnKeyString);
    }


    public object ToTenantWrapper(Tenant t)
    {
        return new
        {
            created = t.CreationDateTime,
            domain = t.GetTenantDomain(CoreSettings),
            hostedRegion = t.HostedRegion,
            industry = t.Industry,
            language = t.Language,
            name = t.Name == "" ? Resource.PortalName : t.Name,
            ownerId = t.OwnerId,
            paymentId = t.PaymentId,
            portalName = t.Alias,
            status = t.Status.ToString(),
            tenantId = t.Id,
            timeZoneName = TimeZoneConverter.GetTimeZone(t.TimeZone).DisplayName,
        };
    }

    public string CreateReference(string requestUriScheme, string tenantDomain, string email, bool first = false, string module = "", bool sms = false)
    {
        var url = CommonLinkUtility.GetConfirmationUrlRelative(email, ConfirmType.Auth, (first ? "true" : "") + module + (sms ? "true" : ""));
        return $"{requestUriScheme}{Uri.SchemeDelimiter}{tenantDomain}/{url}{(first ? "&first=true" : "")}{(string.IsNullOrEmpty(module) ? "" : "&module=" + module)}{(sms ? "&sms=true" : "")}";
    }

    public bool SendCongratulations(string requestUriScheme, Tenant tenant, bool skipWelcome, out string url)
    {
        var validationKey = EmailValidationKeyProvider.GetEmailKey(tenant.Id, tenant.OwnerId.ToString() + ConfirmType.Auth);

        url = string.Format("{0}{1}{2}{3}{4}?userid={5}&key={6}",
                            requestUriScheme,
                            Uri.SchemeDelimiter,
                            tenant.GetTenantDomain(CoreSettings),
                            CommonConstants.WebApiBaseUrl,
                            "portal/sendcongratulations",
                            tenant.OwnerId,
                            validationKey);

        if (skipWelcome)
        {
            Log.LogDebug("congratulations skiped");
            return false;
        }

        var request = new HttpRequestMessage();
        request.Method = HttpMethod.Post;
        request.RequestUri = new Uri(url);
        request.Headers.Accept.Add(MediaTypeWithQualityHeaderValue.Parse("application/x-www-form-urlencoded"));

        try
        {
            var httpClient = ClientFactory.CreateClient();
            using var response = httpClient.Send(request);
            using var stream = response.Content.ReadAsStream();
            using var reader = new StreamReader(stream, Encoding.UTF8);

            var result = reader.ReadToEnd();

            Log.LogDebug("congratulations result = {0}", result);

            var resObj = JObject.Parse(result);

            if (resObj["errors"] != null && resObj["errors"].HasValues)
            {
                throw new Exception(result);
            }
        }
        catch (Exception ex)
        {
            Log.LogError(ex, "SendCongratulations error");
            return false;
        }

        url = null;
        return true;
    }

    public bool GetTenant(IModel model, out Tenant tenant)
    {
        if (CoreBaseSettings.Standalone && model != null && !string.IsNullOrWhiteSpace((model.PortalName ?? "")))
        {
            tenant = TenantManager.GetTenant((model.PortalName ?? "").Trim());
            return true;
        }

        if (model != null && model.TenantId.HasValue)
        {
            tenant = HostedSolution.GetTenant(model.TenantId.Value);
            return true;
        }

        if (model != null && !string.IsNullOrWhiteSpace((model.PortalName ?? "")))
        {
            tenant = HostedSolution.GetTenant((model.PortalName ?? "").Trim());
            return true;
        }

        tenant = null;
        return false;
    }

    public bool IsTestEmail(string email)
    {
        //the point is not needed in gmail.com
        email = Regex.Replace(email ?? "", "\\.*(?=\\S*(@gmail.com$))", "").ToLower();
        if (string.IsNullOrEmpty(email) || string.IsNullOrEmpty(CommonConstants.AutotestSecretEmails))
            return false;

        var regex = new Regex(CommonConstants.AutotestSecretEmails, RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.Compiled);
        return regex.IsMatch(email);
    }

    public bool CheckMuchRegistration(TenantModel model, string clientIP, Stopwatch sw)
    {
        if (IsTestEmail(model.Email)) return false;

        Log.LogDebug("clientIP = {0}", clientIP);

        var cacheKey = "ip_" + clientIP;

        if (MemoryCache.TryGetValue(cacheKey, out int ipAttemptsCount))
        {
            MemoryCache.Remove(cacheKey);
        }

        ipAttemptsCount++;

        MemoryCache.Set(
            // String that represents the name of the cache item,
            // could be any string
            cacheKey,
            // Something to store in the cache
            ipAttemptsCount,
            new MemoryCacheEntryOptions
            {
                // Will not use absolute cache expiration
                AbsoluteExpiration = DateTime.MaxValue,
                // Cache will expire after one hour
                // You can change this time interval according
                // to your requriements
                SlidingExpiration = CommonConstants.MaxAttemptsTimeInterval,
                // Cache will not be removed before expired
                Priority = CacheItemPriority.NeverRemove
            });

        if (ipAttemptsCount <= CommonConstants.MaxAttemptsCount) return false;

        Log.LogDebug("PortalName = {0}; Too much reqests from ip: {1}", model.PortalName, clientIP);
        sw.Stop();

        return true;
    }

    public string GetClientIp()
    {
        return HttpContextAccessor.HttpContext.Connection.RemoteIpAddress.ToString();

        //TODO: check old version

        //if (request.Properties.ContainsKey("MS_HttpContext"))
        //{
        //    return ((HttpContextWrapper)request.Properties["MS_HttpContext"]).Request.UserHostAddress;
        //}

        //if (request.Properties.ContainsKey(RemoteEndpointMessageProperty.Name))
        //{
        //    var prop = (RemoteEndpointMessageProperty)request.Properties[RemoteEndpointMessageProperty.Name];
        //    return prop.Address;
        //}

        //return null;
    }

    public bool ValidateRecaptcha(string response, RecaptchaType recaptchaType, string ip)
    {
        try
        {
            string privateKey;
            switch (recaptchaType)
            {
                case RecaptchaType.AndroidV2:
                    privateKey = Configuration["recaptcha:private-key:android"];
                    break;
                case RecaptchaType.iOSV2:
                    privateKey = Configuration["recaptcha:private-key:ios"];
                    break;
                default:
                    privateKey = Configuration["recaptcha:private-key"];
                    break;
            }

            var data = $"secret={privateKey}&remoteip={ip}&response={response}";
            var url = Configuration["recaptcha:verify-url"] ?? "https://www.recaptcha.net/recaptcha/api/siteverify";

            var request = new HttpRequestMessage();
            request.RequestUri = new Uri(url);
            request.Method = HttpMethod.Post;
            request.Content = new StringContent(data, Encoding.UTF8, "application/x-www-form-urlencoded");

            var httpClient = ClientFactory.CreateClient();
            using var httpClientResponse = httpClient.Send(request);
            using var stream = httpClientResponse.Content.ReadAsStream();
            using var reader = new StreamReader(stream);

            var resp = reader.ReadToEnd();
            var resObj = JObject.Parse(resp);

            if (resObj["success"] != null && resObj.Value<bool>("success"))
            {
                return true;
            }
            else
            {
                Log.LogDebug("Recaptcha error: {0}", resp);
            }

            if (resObj["error-codes"] != null && resObj["error-codes"].HasValues)
            {
                Log.LogDebug("Recaptcha api returns errors: {0}", resp);
            }
        }
        catch (Exception ex)
        {
            Log.LogError(ex, "ValidateRecaptcha");
        }
        return false;
    }
}