using Oqtane.Models;
using System.Threading.Tasks;
using System.Linq;
using System.Collections.Generic;
using System;
using Oqtane.Documentation;
using Microsoft.Extensions.Caching.Memory;
using Oqtane.Infrastructure;
using Oqtane.Repository;
using Oqtane.Security;
using Microsoft.AspNetCore.Http;
using Oqtane.Enums;
using Oqtane.Shared;
using System.Globalization;
using Oqtane.Extensions;

namespace Oqtane.Services
{
    [PrivateApi("Don't show in the documentation, as everything should use the Interface")]
    public class ServerSiteService : ISiteService
    {
        private readonly ISiteRepository _sites;
        private readonly IPageRepository _pages;
        private readonly IThemeRepository _themes;
        private readonly IPageModuleRepository _pageModules;
        private readonly IModuleDefinitionRepository _moduleDefinitions;
        private readonly ILanguageRepository _languages;
        private readonly IUserPermissions _userPermissions;
        private readonly ISettingRepository _settings;
        private readonly ITenantManager _tenantManager;
        private readonly ISyncManager _syncManager;
        private readonly IConfigManager _configManager;
        private readonly ILogManager _logger;
        private readonly IMemoryCache _cache;
        private readonly IHttpContextAccessor _accessor;
        private readonly string _private = "[PRIVATE]";

        public ServerSiteService(ISiteRepository sites, IPageRepository pages, IThemeRepository themes, IPageModuleRepository pageModules, IModuleDefinitionRepository moduleDefinitions, ILanguageRepository languages, IUserPermissions userPermissions, ISettingRepository settings, ITenantManager tenantManager, ISyncManager syncManager, IConfigManager configManager, ILogManager logger, IMemoryCache cache, IHttpContextAccessor accessor)
        {
            _sites = sites;
            _pages = pages;
            _themes = themes;
            _pageModules = pageModules;
            _moduleDefinitions = moduleDefinitions;
            _languages = languages;
            _userPermissions = userPermissions;
            _settings = settings;
            _tenantManager = tenantManager;
            _syncManager = syncManager;
            _configManager = configManager;
            _logger = logger;
            _cache = cache;
            _accessor = accessor;
        }

        public Task<List<Site>> GetSitesAsync()
        {
            List<Site> sites = new List<Site>();
            if (_accessor.HttpContext.User.IsInRole(RoleNames.Host))
            {
                sites = _sites.GetSites().ToList();
            }
            return Task.FromResult(sites);
        }

        public Task<Site> GetSiteAsync(int siteId)
        {
            var alias = _tenantManager.GetAlias();
            var site = _cache.GetOrCreate($"site:{alias.SiteKey}", entry =>
            {
                entry.SlidingExpiration = TimeSpan.FromMinutes(30);
                return GetSite(siteId);
            });

            // clone object so that cache is not mutated
            site = site.Clone();

            // trim site settings based on user permissions
            site.Settings = site.Settings
                .Where(item => !item.Value.StartsWith(_private) || _accessor.HttpContext.User.IsInRole(RoleNames.Admin))
                .ToDictionary(setting => setting.Key, setting => setting.Value.Replace(_private, ""));

            // trim pages based on user permissions
            var pages = new List<Page>();
            foreach (Page page in site.Pages)
            {
                if (!page.IsDeleted && _userPermissions.IsAuthorized(_accessor.HttpContext.User, PermissionNames.View, page.PermissionList) && (Utilities.IsEffectiveAndNotExpired(page.EffectiveDate, page.ExpiryDate) || _userPermissions.IsAuthorized(_accessor.HttpContext.User, PermissionNames.Edit, page.PermissionList)))
                {
                    page.Settings = page.Settings
                        .Where(item => !item.Value.StartsWith(_private) || _userPermissions.IsAuthorized(_accessor.HttpContext.User, PermissionNames.Edit, page.PermissionList))
                        .ToDictionary(setting => setting.Key, setting => setting.Value.Replace(_private, ""));
                    pages.Add(page);
                }
            }
            site.Pages = pages;

            // get language display name for user
            foreach (Language language in site.Languages)
            {
                language.Name = CultureInfo.GetCultureInfo(language.Code).DisplayName;
            }
            site.Languages = site.Languages.OrderBy(item => item.Name).ToList();

            return Task.FromResult(site);
        }

        private Site GetSite(int siteid)
        {
            var alias = _tenantManager.GetAlias();
            var site = _sites.GetSite(siteid);
            if (site != null && site.SiteId == alias.SiteId)
            {
                // site settings
                site.Settings = _settings.GetSettings(EntityNames.Site, site.SiteId)
                    .ToDictionary(setting => setting.SettingName, setting => (setting.IsPrivate ? _private : "") + setting.SettingValue);

                // populate file extensions 
                site.ImageFiles = site.Settings.ContainsKey("ImageFiles") && !string.IsNullOrEmpty(site.Settings["ImageFiles"])
                    ? site.Settings["ImageFiles"] : Constants.ImageFiles;
                site.UploadableFiles = site.Settings.ContainsKey("UploadableFiles") && !string.IsNullOrEmpty(site.Settings["UploadableFiles"])
                    ? site.Settings["UploadableFiles"] : Constants.UploadableFiles;

                // pages
                List<Setting> settings = _settings.GetSettings(EntityNames.Page).ToList();
                site.Pages = new List<Page>();
                foreach (Page page in _pages.GetPages(site.SiteId))
                {
                    page.Settings = settings.Where(item => item.EntityId == page.PageId)
                        .ToDictionary(setting => setting.SettingName, setting => (setting.IsPrivate ? _private : "") + setting.SettingValue);
                    site.Pages.Add(page);
                }

                // framework modules
                var modules = GetPageModules(site.SiteId);
                site.Settings.Add(Constants.AdminDashboardModule, modules.FirstOrDefault(item => item.ModuleDefinitionName == Constants.AdminDashboardModule).ModuleId.ToString());
                site.Settings.Add(Constants.PageManagementModule, modules.FirstOrDefault(item => item.ModuleDefinitionName == Constants.PageManagementModule).ModuleId.ToString());

                // languages
                site.Languages = _languages.GetLanguages(site.SiteId).ToList();
                var defaultCulture = CultureInfo.GetCultureInfo(Constants.DefaultCulture);
                if (!site.Languages.Exists(item => item.Code == defaultCulture.Name))
                {
                    site.Languages.Add(new Language { Code = defaultCulture.Name, Name = "", Version = Constants.Version, IsDefault = !site.Languages.Any(l => l.IsDefault) });
                }

                // themes
                site.Themes = _themes.FilterThemes(_themes.GetThemes().ToList());

                // installation date used for fingerprinting static assets
                site.Fingerprint = Utilities.GenerateSimpleHash(_configManager.GetSetting("InstallationDate", DateTime.UtcNow.ToString("yyyyMMddHHmm")));
            }
            else
            {
                if (site != null)
                {
                    _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized Site Get Attempt {SiteId}", siteid);
                    site = null;
                }
            }
            return site;
        }

        public Task<Site> AddSiteAsync(Site site)
        {
            if (_accessor.HttpContext.User.IsInRole(RoleNames.Host))
            {
                site = _sites.AddSite(site);
                _syncManager.AddSyncEvent(_tenantManager.GetAlias(), EntityNames.Site, site.SiteId, SyncEventActions.Create);
                _logger.Log(site.SiteId, LogLevel.Information, this, LogFunction.Create, "Site Added {Site}", site);
            }
            else
            {
                site = null;
            }
            return Task.FromResult(site);
        }

        public Task<Site> UpdateSiteAsync(Site site)
        {
            if (_accessor.HttpContext.User.IsInRole(RoleNames.Admin))
            {
                var alias = _tenantManager.GetAlias();
                var current = _sites.GetSite(site.SiteId, false);
                if (site.SiteId == alias.SiteId && site.TenantId == alias.TenantId && current != null)
                {
                    site = _sites.UpdateSite(site);
                    _syncManager.AddSyncEvent(alias, EntityNames.Site, site.SiteId, SyncEventActions.Update);
                    string action = SyncEventActions.Refresh;
                    if (current.RenderMode != site.RenderMode || current.Runtime != site.Runtime)
                    {
                        action = SyncEventActions.Reload;
                    }
                    _syncManager.AddSyncEvent(alias, EntityNames.Site, site.SiteId, action);
                    _logger.Log(site.SiteId, LogLevel.Information, this, LogFunction.Update, "Site Updated {Site}", site);
                }
                else
                {
                    _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized Site Put Attempt {Site}", site);
                    site = null;
                }
            }
            else
            {
                site = null;
            }
            return Task.FromResult(site);
        }

        public Task DeleteSiteAsync(int siteId)
        {
            if (_accessor.HttpContext.User.IsInRole(RoleNames.Host))
            {
                var alias = _tenantManager.GetAlias();
                var site = _sites.GetSite(siteId);
                if (site != null && site.SiteId == alias.SiteId)
                {
                    _sites.DeleteSite(siteId);
                    _syncManager.AddSyncEvent(alias, EntityNames.Site, site.SiteId, SyncEventActions.Delete);
                    _syncManager.AddSyncEvent(alias, EntityNames.Site, site.SiteId, SyncEventActions.Refresh);
                    _logger.Log(siteId, LogLevel.Information, this, LogFunction.Delete, "Site Deleted {SiteId}", siteId);
                }
                else
                {
                    _logger.Log(LogLevel.Error, this, LogFunction.Security, "Unauthorized Site Delete Attempt {SiteId}", siteId);
                }
            }
            return Task.CompletedTask;
        }

        public Task<List<Module>> GetModulesAsync(int siteId, int pageId)
        {
            var alias = _tenantManager.GetAlias();
            var modules = _cache.GetOrCreate($"modules:{alias.SiteKey}", entry =>
            {
                entry.SlidingExpiration = TimeSpan.FromMinutes(30);
                return GetPageModules(siteId);
            });

            // clone object so that cache is not mutated
            modules = modules.ConvertAll(module => module.Clone());

            // trim modules for current page based on user permissions
            var pagemodules = new List<Module>();
            foreach (Module module in modules.Where(item => (item.PageId == pageId || pageId == -1) && !item.IsDeleted && _userPermissions.IsAuthorized(_accessor.HttpContext.User, PermissionNames.View, item.PermissionList)))
            {
                if (Utilities.IsEffectiveAndNotExpired(module.EffectiveDate, module.ExpiryDate) || _userPermissions.IsAuthorized(_accessor.HttpContext.User, PermissionNames.Edit, module.PermissionList))
                {
                    module.Settings = module.Settings
                        .Where(item => !item.Value.StartsWith(_private) || _userPermissions.IsAuthorized(_accessor.HttpContext.User, PermissionNames.Edit, module.PermissionList))
                        .ToDictionary(setting => setting.Key, setting => setting.Value.Replace(_private, ""));
                    pagemodules.Add(module);
                }
            }
            return Task.FromResult(pagemodules);
        }

        private List<Module> GetPageModules(int siteId)
        {
            List<ModuleDefinition> moduledefinitions = _moduleDefinitions.GetModuleDefinitions(siteId).ToList();
            var settings = _settings.GetSettings(EntityNames.Module).ToList();
            var modules = new List<Module>();

            foreach (PageModule pagemodule in _pageModules.GetPageModules(siteId))
            {
                Module module = new Module
                {
                    SiteId = pagemodule.Module.SiteId,
                    ModuleDefinitionName = pagemodule.Module.ModuleDefinitionName,
                    AllPages = pagemodule.Module.AllPages,
                    PermissionList = pagemodule.Module.PermissionList,
                    CreatedBy = pagemodule.Module.CreatedBy,
                    CreatedOn = pagemodule.Module.CreatedOn,
                    ModifiedBy = pagemodule.Module.ModifiedBy,
                    ModifiedOn = pagemodule.Module.ModifiedOn,
                    DeletedBy = pagemodule.DeletedBy,
                    DeletedOn = pagemodule.DeletedOn,
                    IsDeleted = pagemodule.IsDeleted,

                    PageModuleId = pagemodule.PageModuleId,
                    ModuleId = pagemodule.ModuleId,
                    PageId = pagemodule.PageId,
                    Title = pagemodule.Title,
                    Pane = pagemodule.Pane,
                    Order = pagemodule.Order,
                    ContainerType = pagemodule.ContainerType,
                    EffectiveDate = pagemodule.EffectiveDate,
                    ExpiryDate = pagemodule.ExpiryDate,

                    ModuleDefinition = _moduleDefinitions.FilterModuleDefinition(moduledefinitions.Find(item => item.ModuleDefinitionName == pagemodule.Module.ModuleDefinitionName)),

                    Settings = settings.Where(item => item.EntityId == pagemodule.ModuleId)
                        .ToDictionary(setting => setting.SettingName, setting => (setting.IsPrivate ? _private : "") + setting.SettingValue)
                };

                modules.Add(module);
            }

            return modules.OrderBy(item => item.PageId).ThenBy(item => item.Pane).ThenBy(item => item.Order).ToList();
        }

        [Obsolete("This method is deprecated.", false)]
        public void SetAlias(Alias alias)
        {
        }
    }
}