using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using PARR.BLL.Domain.Mq;
using PARR.BLL.Services.Interfaces;
using PARR.DAL.Contracts;
using PARR.DAL.Extensions;
using PARR.DAL.Models;
using PARR.DAL.Services.Interfaces;
using System.Text.RegularExpressions;

namespace PARR.AIHITSyncer.Services
{
    internal class SyncerService : ISyncerService
    {
        private readonly ILogger<SyncerService> logger;
        private readonly IHostService hostService;
        private readonly IApplicationService appService;
        private readonly IApplicationInHostService appInHostService;
        private readonly IApplicationTypeService appTypeService;
        private readonly ITransformService transformService;

        public List<ApplicationType> AppTypes { get; private set; } = new List<ApplicationType>();

        public SyncerService(
            ILogger<SyncerService> logger,
            IHostService hostService,
            IApplicationService appService,
            IApplicationInHostService appInHostService,
            IApplicationTypeService appTypeService,
            ITransformService transformService
            )
        {
            this.logger = logger;
            this.hostService = hostService;
            this.appService = appService;
            this.appInHostService = appInHostService;
            this.appTypeService = appTypeService;
            this.transformService = transformService;
        }


        public async Task SyncAsync(string msg)
        {
            await GetAppTypesAsync();

            var objFromQuery = transformService.GetModelFromJson<AihitDataMq>(msg);
            if (objFromQuery == null)
                return;

            await SyncHostAsync(objFromQuery);
        }


        private async Task SyncHostAsync(AihitDataMq objFromQuery)
        {
            //ищем существующий хост в БД
            var host = await hostService.GetHostWithAppsAsync(objFromQuery.IP);
            var isNew = false;
            //если не нашли - создаём
            if (host == null)
            {
                isNew = true;
                host = await CreateHostAsync(objFromQuery);
            }
            else
            {
                logger.LogDebug($"Найден хост в БД: {host!.Ek}({host.IP})");
                //проверям и обновляем поля
                await SyncHostFieldsAsync(host, objFromQuery);
            }

            //получаем лист ПО из объекта
            var appsInObj = await GetAppsInObjectAsync(host, objFromQuery);

            await SyncApplicationInHostAsync(host, appsInObj, !isNew);
        }


        private async Task<Host?> CreateHostAsync(AihitDataMq objFromQuery)
        {
            var id = Guid.NewGuid();
            var host = new Host
            {
                Id = id,
                Ek = objFromQuery.EK,
                IP = objFromQuery.IP,
                EkStatusCode = ResolveCode(objFromQuery.Status),
                WorkGroup = objFromQuery.WorkGroup,
                ResponseAreaCode = ResolveCode(objFromQuery.ResponseArea)
            };

            if (!await hostService.CreateAsync(host) || !await hostService.CommitAsync())
                logger.LogError($"Не удалось создать узел {host.Ek}({host.IP})");
            else
                logger.LogInformation($"----- Создан узел: {host.Id}  -----");


            return await hostService.GetHostWithAppsAsync(host.IP);
        }


        private async Task SyncHostFieldsAsync(Host host, AihitDataMq objFromQuery)
        {
            var isChanged = false;
            if (host.IP != objFromQuery.IP)
            {
                host.IP = objFromQuery.IP;
                isChanged = true;
            }
            if (host.EkStatusCode != ResolveCode(objFromQuery.Status))
            {
                host.EkStatusCode = ResolveCode(objFromQuery.Status);
                isChanged = true;
            }
            if (objFromQuery.WorkGroup != null && (host.WorkGroup == null || !host.WorkGroup!.Equals(objFromQuery.WorkGroup)))
            {
                host.WorkGroup = objFromQuery.WorkGroup;
                isChanged = true;
            }
            if (host.ResponseAreaCode != ((ResolveCode(objFromQuery.ResponseArea) == 0) ? 99 : ResolveCode(objFromQuery.ResponseArea)))
            {//TODO Возможно проще выгружать с помощью INCLUDE зону ответственности и сравнивать string
                host.ResponseAreaCode = ((ResolveCode(objFromQuery.ResponseArea) == 0) ? 99 : ResolveCode(objFromQuery.ResponseArea));
                isChanged = true;
            }
            if (isChanged)
            {
                host.DateModified = DateTimeOffset.UtcNow;
                if (!await hostService.CommitAsync())
                    logger.LogError($"Не удалось обновить узел {host.Ek}({host.IP})");
                else
                    logger.LogInformation($"Обновлён Host: {host.Ek}({host.Id})");
            }
        }


        private async Task<List<Application>> GetAppsInObjectAsync(Host? host, AihitDataMq objFromQuery)
        {
            var applications = new List<Application>();

            if (objFromQuery.APPType != null)
            {
                var appList = objFromQuery.APPType.Split(new char[] { ',', ';' }).Distinct().ToList();
                foreach (var app in appList)
                {
                    var created = await CreateAppIfNotExistAsync(app, ApplicationTypesEnum.APP);
                    if (created != null)
                        applications.Add(created);
                }
            }
            if (objFromQuery.DBType != null)
            {
                var appList = objFromQuery.DBType.Split(new char[] { ',', ';' }).Distinct().ToList();
                foreach (var app in appList)
                {
                    var created = await CreateAppIfNotExistAsync(app, ApplicationTypesEnum.DB);
                    if (created != null)
                        applications.Add(created);
                }
            }
            if (objFromQuery.OSType != null)
            {
                var appList = objFromQuery.OSType.Split(new char[] { ',', ';' }).Distinct().ToList();
                foreach (var app in appList)
                {
                    var created = await CreateAppIfNotExistAsync(app, ApplicationTypesEnum.OS);
                    if (created != null)
                        applications.Add(created);
                }
            }
            return applications;
        }


        private async Task<Application?> CreateAppIfNotExistAsync(string appName, ApplicationTypesEnum type)
        {
            if (string.IsNullOrEmpty(appName) || string.IsNullOrWhiteSpace(appName)) return null;


            var existApp = await appService.GetByNameAsync(appName);
            if (existApp != null)
                return existApp;

            //Создаем
            var appType = GetAppTypeByName(type);
            if (appType == null)
            {
                logger.LogError($"Не удалось создать запись в таблице Applications: {appName}, так как не получил AppType: {type.ToString()}");
                return null;
            }

            var app = new Application
            {
                Id = Guid.NewGuid(),
                Name = appName.Trim(),
                ApplicationTypeId = appType.Id
            };

            if (!await appService.CreateAsync(app) || !await appService.CommitAsync())
                logger.LogError($"Не удалось создать запись в таблице Application: {appName}, {app.ToJson()}");
            else
                logger.LogInformation($"Создана запись а таблице Application: {appName}, {app.ToJson()}");

            return await appService.GetAsync(app.Id);

        }


        /// <summary>
        /// Метод синхронизации 
        /// </summary>
        /// <param name="host">Хост</param>
        /// <param name="hostApplications">Список программного обеспечения</param>
        /// <param name="isUpdateDateModified">Признак обновления поля DateModified</param>
        /// <returns></returns>
        private async Task SyncApplicationInHostAsync(Host? host, List<Application> appsInObject, bool isUpdateDateModified = false)
        {
            var isUpdated = false;
            if (host == null)
                return;

            logger.LogDebug($"Host: {host.Ek}({host.IP}), начало синхронизации приложений ({appsInObject.Count()}) ");

            foreach (var appInObject in appsInObject)
            {
                var exist = host.ApplicationsInHosts.FirstOrDefault(a => a.ApplicationId == appInObject.Id);

                if (exist == null)
                {
                    //add
                    logger.LogInformation($"Host: {host.Ek}({host.IP}), добавление нового приложения Application {appInObject.Name}");

                    var newAppHost = new ApplicationInHost { Id = Guid.NewGuid(), ApplicationId = appInObject.Id, HostId = host.Id };
                    if (!await appInHostService.CreateAsync(newAppHost))
                        logger.LogError($"Не удалось создать ApplicationInHost {appInObject.Name}, host: {host.Ek}({host.IP})");

                    isUpdated = true;
                }
            }

            foreach (var appInHost in host.ApplicationsInHosts)
            {
                var appToRemove = appsInObject.FirstOrDefault(a => a.Id == appInHost.ApplicationId);

                if (appToRemove == null)
                {
                    //todo remove appToRemove
                    var obj = await appInHostService.Get().FirstOrDefaultAsync(t => t.ApplicationId == appInHost.ApplicationId && t.HostId == host.Id);
                    if (obj != null)
                    {
                        logger.LogInformation($"Host: {host.Ek}({host.IP}), удаление неактуального приложения Application {appInHost.Application?.Name}");
                        appInHostService.Delete(obj);

                        if (!await appInHostService.CommitAsync())
                            logger.LogError($"Не удалось удалить Application {appInHost.Application?.Name} узла {host.Ek}({host.IP})");

                        isUpdated = true;
                    }
                }
            }

            if (isUpdated && isUpdateDateModified)
                host.DateModified = DateTimeOffset.UtcNow;

            if (!await appInHostService.CommitAsync())
                logger.LogError($"Не удалось обновить ApplicationInHost для Host: {host.Ek}({host.IP})");

            logger.LogDebug($"Host: {host.Ek}({host.IP} конец синхронизации приложений");

        }


        private ApplicationType? GetAppTypeByName(ApplicationTypesEnum type)
        {
            var existType = AppTypes.FirstOrDefault(t => t.Name == type.ToString());
            if (existType == null)
                logger.LogError($"Не найден AppType: {type}");

            return existType;
        }


        /// <summary>
        /// Возвращает первую цифру из строки, котроая является кодом статуса или зоны ответственности для ЭК
        /// </summary>
        /// <param name="field"></param>
        /// <returns></returns>
        private int ResolveCode(string field)
        {
            var pattern = "\\d+";
            var regex = new Regex(pattern);

            int.TryParse(regex.Match(field).Value, out int result);

            return result;
        }

        private async Task GetAppTypesAsync()
        {
            if (AppTypes == null || AppTypes.Count == 0)
                AppTypes = await appTypeService.Get().ToListAsync();
        }
    }
}