using AsbCloudApp.Data;
using AsbCloudApp.Repositories;
using AsbCloudApp.Requests;
using AsbCloudApp.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using AsbCloudApp.Data.WellOperationImport;
using AsbCloudApp.Services.WellOperationImport;
using AsbCloudApp.Data.WellOperationImport.Options;
using AsbCloudApp.Exceptions;
using AsbCloudDb.Model;
using AsbCloudInfrastructure;

namespace AsbCloudWebApi.Controllers
{

    /// <summary>
    /// Буровые операции (вводимые вручную)
    /// </summary>
    [Route("api/well/{idWell}/wellOperations")]
    [ApiController]
    [Authorize]
    public class WellOperationController : ControllerBase
    {
        private readonly IWellOperationRepository operationRepository;
        private readonly IWellService wellService;
        private readonly IWellOperationExportService wellOperationExportService;
        private readonly IWellOperationImportTemplateService wellOperationImportTemplateService;
        private readonly IWellOperationImportService wellOperationImportService;
        private readonly IWellOperationExcelParser<WellOperationImportDefaultOptionsDto> wellOperationDefaultExcelParser;
        private readonly IWellOperationExcelParser<WellOperationImportGazpromKhantosOptionsDto> wellOperationGazpromKhantosExcelParser;
        private readonly IUserRepository userRepository;

        public WellOperationController(IWellOperationRepository operationRepository, 
            IWellService wellService, 
            IWellOperationImportTemplateService wellOperationImportTemplateService,
            IWellOperationExportService wellOperationExportService,
            IWellOperationImportService wellOperationImportService,
            IWellOperationExcelParser<WellOperationImportDefaultOptionsDto> wellOperationDefaultExcelParser,
            IWellOperationExcelParser<WellOperationImportGazpromKhantosOptionsDto> wellOperationGazpromKhantosExcelParser,
            IUserRepository userRepository)
        {
            this.operationRepository = operationRepository;
            this.wellService = wellService;
            this.wellOperationImportTemplateService = wellOperationImportTemplateService;
            this.wellOperationExportService = wellOperationExportService;
            this.wellOperationImportService = wellOperationImportService;
            this.wellOperationDefaultExcelParser = wellOperationDefaultExcelParser;
            this.wellOperationGazpromKhantosExcelParser = wellOperationGazpromKhantosExcelParser;
            this.userRepository = userRepository;
        }

        /// <summary>
        /// Возвращает словарь типов секций
        /// </summary>
        /// <returns></returns>
        [HttpGet("sectionTypes")]
        [Permission]
        [ProducesResponseType(typeof(IEnumerable<WellSectionTypeDto>), (int)System.Net.HttpStatusCode.OK)]
        public IActionResult GetSectionTypes()
        {
            var result = operationRepository.GetSectionTypes();
            return Ok(result);
        }

        /// <summary>
        /// Возвращает список имен типов операций на скважине
        /// </summary>
        /// <param name="includeParents">флаг, нужно ли включать родителей в список</param>
        /// <returns></returns>
        [HttpGet("categories")]
        [Permission]
        [ProducesResponseType(typeof(IEnumerable<WellOperationCategoryDto>), (int)System.Net.HttpStatusCode.OK)]
        public IActionResult GetCategories(bool includeParents = true)
        {
            var result = operationRepository.GetCategories(includeParents);
            return Ok(result);
        }

        /// <summary>
        /// Возвращает список плановых операций для сопоставления
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="currentDate">дата для нахождения последней сопоставленной плановой операции</param>
        /// <param name="token"></param>
        /// <returns></returns>
        [HttpGet("operationsPlan")]
        [ProducesResponseType(typeof(WellOperationPlanDto), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetOperationsPlanAsync(
            [FromRoute] int idWell,
            [FromQuery] DateTime currentDate,
            CancellationToken token)
        {
            if (!await CanUserAccessToWellAsync(idWell, token).ConfigureAwait(false))
                return Forbid();

            var result = await operationRepository
                .GetOperationsPlanAsync(idWell, currentDate, token)
                .ConfigureAwait(false);
            return Ok(result);
        }

        /// <summary>
        /// Отфильтрованный список фактических операций на скважине. 
        /// Если не применять фильтр, то вернется весь список. Сортированный по глубине затем по дате
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="request"></param>
        /// <param name="token"></param>
        /// <returns>Список операций на скважине</returns>
        [HttpGet("fact")]
        [Permission]
        [ProducesResponseType(typeof(IEnumerable<WellOperationDto>), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetPageOperationsFactAsync(
            [FromRoute] int idWell,
            [FromQuery] WellOperationRequestBase request,
            CancellationToken token)
        {
            if (!await CanUserAccessToWellAsync(idWell, token).ConfigureAwait(false))
                return Forbid();

            var requestToService = new WellOperationRequest(request, idWell);
            var result = await operationRepository.GetAsync(
                requestToService,
                token)
                .ConfigureAwait(false);
            return Ok(result);
        }

        /// <summary>
        /// Отфильтрованный список плановых операций на скважине. 
        /// Если не применять фильтр, то вернется весь список. Сортированный по глубине затем по дате
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="request"></param>
        /// <param name="token"></param>
        /// <returns>Список операций на скважине в контейнере для постраничного просмотра</returns>
        [HttpGet("plan")]
        [Permission]
        [ProducesResponseType(typeof(PaginationContainer<WellOperationDto>), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetPageOperationsPlanAsync(
            [FromRoute] int idWell,
            [FromQuery] WellOperationRequestBase request,
            CancellationToken token)
        {
            if (!await CanUserAccessToWellAsync(idWell, token).ConfigureAwait(false))
                return Forbid();

            var requestToService = new WellOperationRequest(request, idWell);
            var result = await operationRepository.GetPageAsync(
                requestToService,
                token)
                .ConfigureAwait(false);
            return Ok(result);
        }

        /// <summary>
        /// Статистика операций по скважине, группированая по категориям
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="request"></param>      
        /// <param name="token"></param>
        /// <returns></returns>
        [HttpGet("groupStat")]
        [Permission]
        [ProducesResponseType(typeof(IEnumerable<WellGroupOpertionDto>), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetGroupOperationsAsync(
            [FromRoute] int idWell,
            [FromQuery] WellOperationRequestBase request,
            CancellationToken token)
        {
            if (!await CanUserAccessToWellAsync(idWell, token).ConfigureAwait(false))
                return Forbid();

            var requestToService = new WellOperationRequest(request, idWell);
            var result = await operationRepository.GetGroupOperationsStatAsync(
                requestToService,
                token)
                .ConfigureAwait(false);
            return Ok(result);
        }

        /// <summary>
        /// Возвращает нужную операцию на скважине
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="idOperation">id нужной операции</param>
        /// <param name="token">Токен отмены задачи</param>
        /// <returns>Нужную операцию на скважине</returns>
        [HttpGet("{idOperation}")]
        [Permission]
        [ProducesResponseType(typeof(WellOperationDto), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetOrDefaultAsync(int idWell, int idOperation,
            CancellationToken token)
        {
            if (!await CanUserAccessToWellAsync(idWell, token).ConfigureAwait(false))
                return Forbid();

            var result = await operationRepository.GetOrDefaultAsync(idOperation, token).ConfigureAwait(false);
            return Ok(result);
        }

        /// <summary>
        /// Добавляет новую операцию на скважину
        /// </summary>
        /// <param name="idWell">Id скважины</param>
        /// <param name="idType">Тип добавляемой операции</param>
        /// <param name="wellOperation">Добавляемая операция</param>
        /// <param name="cancellationToken"></param>
        /// <returns>Количество добавленных в БД записей</returns>
        [HttpPost("{idType:int}")]
        [Permission]
        [ProducesResponseType(typeof(int), StatusCodes.Status200OK)]
        [ProducesResponseType(typeof(ValidationProblemDetails), StatusCodes.Status400BadRequest)]
        public async Task<IActionResult> InsertAsync(
            [Range(1, int.MaxValue, ErrorMessage = "Id скважины не может быть меньше 1")] int idWell,
            [Range(0, 1, ErrorMessage = "Тип операции недопустим. Допустимые: 0, 1")] int idType,
            WellOperationDto wellOperation,
            CancellationToken cancellationToken)
        {
            if (!await CanUserAccessToWellAsync(idWell, cancellationToken))
                return Forbid();

            if (!await CanUserEditWellOperationsAsync(idWell, cancellationToken))
                return Forbid();
            
            wellOperation.IdWell = idWell;
            wellOperation.LastUpdateDate = DateTimeOffset.UtcNow;
            wellOperation.IdUser = User.GetUserId();
            wellOperation.IdType = idType;

            var result = await operationRepository.InsertRangeAsync(new[] { wellOperation }, cancellationToken);

            return Ok(result);
        }

        /// <summary>
        /// Добавляет новые операции на скважине
        /// </summary>
        /// <param name="idWell">Id скважины</param>
        /// <param name="wellOperations">Добавляемые операции</param>
        /// <param name="idType">Тип добавляемых операций</param>
        /// <param name="deleteBeforeInsert">Удалить операции перед сохранением</param>
        /// <param name="cancellationToken"></param>
        /// <returns>Количество добавленных в БД записей</returns>
        [HttpPost("{idType:int}/{deleteBeforeInsert:bool}")]
        [Permission]
        [ProducesResponseType(typeof(int), StatusCodes.Status200OK)]
        [ProducesResponseType(typeof(ValidationProblemDetails), StatusCodes.Status400BadRequest)]
        public async Task<IActionResult> InsertRangeAsync(
            [Range(1, int.MaxValue, ErrorMessage = "Id скважины не может быть меньше 1")] int idWell,
            [Range(0, 1, ErrorMessage = "Тип операции недопустим. Допустимые: 0, 1")] int idType,
            bool deleteBeforeInsert,
            [FromBody] IEnumerable<WellOperationDto> wellOperations,
            CancellationToken cancellationToken)
        {
            if (!await CanUserAccessToWellAsync(idWell, cancellationToken))
                return Forbid();

            if (!await CanUserEditWellOperationsAsync(idWell, cancellationToken))
                return Forbid();

            if (deleteBeforeInsert)
            {
                var existingOperations = await operationRepository.GetAsync(new WellOperationRequest
                {
                    IdWell = idWell,
                    OperationType = idType
                }, cancellationToken);

                await operationRepository.DeleteAsync(existingOperations.Select(o => o.Id), cancellationToken);
            }
            
            foreach (var wellOperation in wellOperations)
            {
                wellOperation.IdWell = idWell;
                wellOperation.LastUpdateDate = DateTimeOffset.UtcNow;
                wellOperation.IdUser = User.GetUserId();
                wellOperation.IdType = idType;
            }

            var result = await operationRepository.InsertRangeAsync(wellOperations, cancellationToken);

            return Ok(result);
        }

        /// <summary>
        /// Обновляет выбранную операцию на скважине
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="idOperation">id выбранной операции</param>
        /// <param name="value">Новые данные для выбранной операции</param>
        /// <param name="token">Токен отмены задачи</param>
        /// <returns>Количество обновленных в БД строк</returns>
        [HttpPut("{idOperation}")]
        [Permission]
        [ProducesResponseType(typeof(WellOperationDto), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> UpdateAsync(int idWell, int idOperation,
            [FromBody] WellOperationDto value, CancellationToken token)
        {
            if (!await CanUserAccessToWellAsync(idWell, token))
                return Forbid();
            
            if (!await CanUserEditWellOperationsAsync(idWell, token))
                return Forbid();

            value.IdWell = idWell;
            value.Id = idOperation;
            value.LastUpdateDate = DateTimeOffset.UtcNow;
            value.IdUser = User.GetUserId();

            var result = await operationRepository.UpdateAsync(value, token)
                .ConfigureAwait(false);
            return Ok(result);
        }

        /// <summary>
        /// Удаляет выбранную операцию на скважине
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="idOperation">id выбранной операции</param>
        /// <param name="token">Токен отмены задачи</param>
        /// <returns>Количество удаленных из БД строк</returns>
        [HttpDelete("{idOperation}")]
        [Permission]
        [ProducesResponseType(typeof(int), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> DeleteAsync(int idWell, int idOperation, CancellationToken token)
        {
            if (!await CanUserAccessToWellAsync(idWell, token))
                return Forbid();
            
            if (!await CanUserEditWellOperationsAsync(idWell, token))
                return Forbid();

            var result = await operationRepository.DeleteAsync(new int[] { idOperation }, token)
                .ConfigureAwait(false);

            return Ok(result);
        }

        /// <summary>
        /// Импорт фактических операций из excel (xlsx) файла. Стандартный заполненный шаблон
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="files">Коллекция из одного файла xlsx</param>
        /// <param name="deleteBeforeInsert">Удалить операции перед сохранением</param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        [HttpPost("import/fact/default/{deleteBeforeInsert:bool}")]
        [ProducesResponseType(typeof(IEnumerable<WellOperationDto>), StatusCodes.Status200OK)]
        [ProducesResponseType(typeof(ValidationProblemDetails), StatusCodes.Status400BadRequest)]
        [Permission]
        public Task<IActionResult> ImportFactDefaultExcelFileAsync(int idWell,
            [FromForm] IFormFileCollection files,
            bool deleteBeforeInsert,
            CancellationToken cancellationToken)
        {
            var options = new WellOperationImportDefaultOptionsDto
            {
                IdType = WellOperation.IdOperationTypeFact
            };

            return ImportExcelFileAsync(idWell, files, options,
                (stream, _) => wellOperationDefaultExcelParser.Parse(stream, options),
                deleteBeforeInsert,
                cancellationToken);
        }
        
        /// <summary>
        /// Импорт плановых операций из excel (xlsx) файла. Стандартный заполненный шаблон
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="files">Коллекция из одного файла xlsx</param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        [HttpPost("import/plan/default")]
        [ProducesResponseType(typeof(IEnumerable<WellOperationDto>), StatusCodes.Status200OK)]
        [ProducesResponseType(typeof(ValidationProblemDetails), StatusCodes.Status400BadRequest)]
        [Permission]
        public Task<IActionResult> ImportPlanDefaultExcelFileAsync(int idWell,
            [FromForm] IFormFileCollection files,
            CancellationToken cancellationToken)
        {
            var options = new WellOperationImportDefaultOptionsDto
            {
                IdType = WellOperation.IdOperationTypePlan
            };
            
            return ImportExcelFileAsync(idWell, files, options,
                (stream, _) => wellOperationDefaultExcelParser.Parse(stream, options),
                null,
                cancellationToken);
        }

        /// <summary>
        /// Импорт операций из excel (xlsx) файла. ГПНХ (Хантос)
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="files">Коллекция из одного файла xlsx</param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        [HttpPost("import/plan/gazpromKhantos")]
        [ProducesResponseType(typeof(IEnumerable<WellOperationDto>), StatusCodes.Status200OK)]
        [ProducesResponseType(typeof(ValidationProblemDetails), StatusCodes.Status400BadRequest)]
        [Permission]
        public Task<IActionResult> ImportPlanGazpromKhantosExcelFileAsync(int idWell,
            [FromForm] IFormFileCollection files,
            CancellationToken cancellationToken)
        {
            var options = new WellOperationImportGazpromKhantosOptionsDto
            {
                IdType = WellOperation.IdOperationTypePlan
            };
            
            return ImportExcelFileAsync(idWell, files, options,
                (stream, _) => wellOperationGazpromKhantosExcelParser.Parse(stream, options),
                null,
                cancellationToken);
        }

        /// <summary>
        /// Создает excel файл с операциями по скважине
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="token">Токен отмены задачи </param>
        /// <returns>Запрашиваемый файл</returns>
        [HttpGet("export")]
        [Permission]
        [ProducesResponseType(typeof(PhysicalFileResult), (int)System.Net.HttpStatusCode.OK, "application/octet-stream")]
        [ProducesResponseType(StatusCodes.Status204NoContent)]
        public async Task<IActionResult> ExportAsync([FromRoute] int idWell, CancellationToken token)
        {
            int? idCompany = User.GetCompanyId();

            if (idCompany is null)
                return Forbid();

            if (!await wellService.IsCompanyInvolvedInWellAsync((int)idCompany,
                idWell, token).ConfigureAwait(false))
                return Forbid();

            var stream = await wellOperationExportService.ExportAsync(idWell, token);
            var fileName = await wellService.GetWellCaptionByIdAsync(idWell, token) + "_operations.xlsx";
            return File(stream, "application/octet-stream", fileName);
        }

        /// <summary>
        /// Создает excel файл с "сетевым графиком"
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="scheduleReportService"></param>
        /// <param name="token"> Токен отмены задачи</param>
        /// <returns>Запрашиваемый файл</returns>
        [HttpGet("scheduleReport")]
        [Permission]
        [ProducesResponseType(typeof(PhysicalFileResult), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> ScheduleReportAsync([FromRoute] int idWell, [FromServices] IScheduleReportService scheduleReportService, CancellationToken token)
        {
            int? idCompany = User.GetCompanyId();

            if (idCompany is null)
                return Forbid();

            if (!await wellService.IsCompanyInvolvedInWellAsync((int)idCompany,
                idWell, token).ConfigureAwait(false))
                return Forbid();

            var stream = await scheduleReportService.MakeReportAsync(idWell, token);
            var fileName = await wellService.GetWellCaptionByIdAsync(idWell, token) + "_ScheduleReport.xlsx";
            return File(stream, "application/octet-stream", fileName);
        }

        /// <summary>
        /// Возвращает шаблон файла импорта
        /// </summary>
        /// <returns>Запрашиваемый файл</returns>
        [HttpGet("template")]
        [AllowAnonymous]
        [ProducesResponseType(typeof(PhysicalFileResult), (int)System.Net.HttpStatusCode.OK, "application/octet-stream")]
        public IActionResult GetTemplate()
        {
            var stream = wellOperationImportTemplateService.GetExcelTemplateStream();
            var fileName = "ЕЦП_шаблон_файла_операций.xlsx";
            return File(stream, "application/octet-stream", fileName);
        }

        //TODO: deleteBeforeInsert тоже быстрый костыль
        private async Task<IActionResult> ImportExcelFileAsync<TOptions>(int idWell, [FromForm] IFormFileCollection files,
            TOptions options,
            Func<Stream, TOptions, SheetDto> parseMethod,
            bool? deleteBeforeInsert,
            CancellationToken cancellationToken)
            where TOptions : IWellOperationImportOptions
        {
            var idCompany = User.GetCompanyId();
            var idUser = User.GetUserId();

            if (!idCompany.HasValue || !idUser.HasValue)
                throw new ForbidException("Неизвестный пользователь");

            if (!await CanUserAccessToWellAsync(idWell, cancellationToken))
                throw new ForbidException("Нет доступа к скважине");

            if (!await CanUserEditWellOperationsAsync(idWell, cancellationToken))
                throw new ForbidException("Недостаточно прав для редактирования ГГД на завершенной скважине");

            if (!await wellService.IsCompanyInvolvedInWellAsync(idCompany.Value, idWell, cancellationToken))
                throw new ForbidException("Скважина недоступна для компании");

            if (files.Count < 1)
                return this.ValidationBadRequest(nameof(files), "Нет файла");

            var file = files[0];
            if (Path.GetExtension(file.FileName).ToLower() != ".xlsx")
                return this.ValidationBadRequest(nameof(files), "Требуется xlsx файл.");

            using Stream stream = file.OpenReadStream();
            
            try
            {
                var sheet = parseMethod(stream, options);

                var wellOperations = wellOperationImportService.Import(idWell, idUser.Value, options.IdType, sheet)
                    .OrderBy(w => w.DateStart);

                var dateStart = wellOperations.MinOrDefault(w => w.DateStart);

                foreach (var wellOperation in wellOperations)
                {
                    if (dateStart.HasValue)
                        wellOperation.Day = (wellOperation.DateStart - dateStart.Value).TotalDays;
                }

                //TODO: очень быстрый костыль
                if (deleteBeforeInsert is not null && options.IdType == WellOperation.IdOperationTypeFact)
                {
                    return await InsertRangeAsync(idWell, options.IdType, 
                        deleteBeforeInsert.Value, 
                        wellOperations,
                        cancellationToken);
                }

                return Ok(wellOperations);
            }
            catch (FileFormatException ex)
            {
                return this.ValidationBadRequest(nameof(files), ex.Message);
            }
        }
        
        private async Task<bool> CanUserAccessToWellAsync(int idWell, CancellationToken token)
        {
            int? idCompany = User.GetCompanyId();
            return idCompany is not null && await wellService.IsCompanyInvolvedInWellAsync((int)idCompany,
                idWell, token).ConfigureAwait(false);
        }
        
        private async Task<bool> CanUserEditWellOperationsAsync(int idWell, CancellationToken token)
        {
            var idUser = User.GetUserId();

            if (!idUser.HasValue)
                return false;
            
            var well = await wellService.GetOrDefaultAsync(idWell, token);

            if (well is null)
                return false;

            return well.IdState != 2 || userRepository.HasPermission(idUser.Value, "WellOperation.editCompletedWell");
        }
    }
}