using AsbCloudDb.Model;
using ClosedXML.Excel;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using AsbCloudApp.Data.DetectedOperation;
using AsbCloudInfrastructure.Services.DetectOperations.Detectors;
using AsbCloudApp.Repositories;
using Microsoft.AspNetCore.Http.Extensions;
using AsbCloudApp.Exceptions;

namespace AsbCloudInfrastructure.Services.DetectOperations;

public class DetectedOperationExportService
{
	private readonly DetectorAbstract[] detectors =
	{
		new DetectorDrilling(),
		new DetectorSlipsTime()
	};

	private const int headerRowsCount = 1;

	private const string cellDepositName = "B1";
	private const string cellClusterName = "B2";
	private const string cellWellName = "B3";
	private const string cellDeltaDate = "H2";

	private const int columnOperationName = 1;
	private const int columnDateStart = 2;
	private const int columnDateEnd = 3;
	private const int columnDuration = 4;
	private const int columnDepthStart = 5;
	private const int columnDepthEnd = 6;
	private const int columnDeltaDepth = 7;
	private const int columnDepth = 8;
	private const int columnIdReasonOfEnd = 9;
	private const int columnComment = 10;

	//TODO: удалить неиспользуемую зависимость
	private readonly IAsbCloudDbContext dbContext;
	private readonly IWellOperationRepository wellOperationRepository;

    public DetectedOperationExportService(IAsbCloudDbContext dbContext, IWellOperationRepository wellOperationRepository)
	{
		this.dbContext = dbContext;
        this.wellOperationRepository = wellOperationRepository;
    }

    /// <summary>
    /// Экспорт excel файла с операциями по скважине
    /// </summary>
    /// <param name="idWell">ключ скважины</param>
    /// <param name="host">хост</param>
    /// <param name="cancellationToken"></param>
    /// <returns></returns>
    /// <exception cref="ArgumentInvalidException"></exception>
    public async Task<Stream> ExportAsync(int idWell, string host, CancellationToken cancellationToken)
	{
		var well = await dbContext.Set<Well>()
			.Include(w => w.Cluster)
			.ThenInclude(c => c.Deposit)
			.FirstOrDefaultAsync(w => w.Id == idWell, cancellationToken);

		if (well is null)
			throw new ArgumentInvalidException(nameof(idWell), $"Well {idWell} does not exist");

		if (!well.IdTelemetry.HasValue)
            throw new ArgumentInvalidException(nameof(idWell), $"Well {idWell} has no telemetry");

        var operations = await DetectOperationsAsync(well.IdTelemetry.Value, DateTime.UnixEpoch, cancellationToken);

		return await GenerateExcelFileStreamAsync(well, host, operations, cancellationToken);
	}

	private async Task<Stream> GenerateExcelFileStreamAsync(Well well, string host, IEnumerable<OperationDetectorResult> operationDetectorResults,
		CancellationToken cancellationToken)
	{
		using var excelTemplateStream = await GetExcelTemplateStreamAsync(cancellationToken);

		using var workbook = new XLWorkbook(excelTemplateStream);

		await AddToWorkbookAsync(workbook, well, host, operationDetectorResults, cancellationToken);

		MemoryStream memoryStream = new MemoryStream();
		workbook.SaveAs(memoryStream, new SaveOptions { });
		memoryStream.Seek(0, SeekOrigin.Begin);
		return memoryStream;
	}

	private async Task AddToWorkbookAsync(XLWorkbook workbook, Well well, string host, IEnumerable<OperationDetectorResult> operationDetectorResults,
		CancellationToken cancellationToken)
	{
		const string sheetName = "Операции";

		if (!operationDetectorResults.Any())
			return;

		var sheet = workbook.GetWorksheet(sheetName);

		await AddToSheetAsync(sheet, well, host, operationDetectorResults
				.OrderBy(x => x.Operation.DateStart).ThenBy(x => x.Operation.DepthStart).ToArray(),
			cancellationToken);
	}

	private async Task AddToSheetAsync(IXLWorksheet sheet, Well well, string host, IList<OperationDetectorResult> operationDetectorResults,
		CancellationToken cancellationToken)
	{
		var wellOperationCategories = await dbContext.WellOperationCategories.ToListAsync(cancellationToken);

		sheet.Cell(cellDepositName).SetCellValue(well.Cluster.Deposit.Caption);
		sheet.Cell(cellClusterName).SetCellValue(well.Cluster.Caption);
		sheet.Cell(cellWellName).SetCellValue(well.Caption);
		sheet.Cell(cellDeltaDate).SetCellValue(operationDetectorResults.Max(o => o.Operation.DateEnd) - operationDetectorResults.Min(o => o.Operation.DateStart));

		var detectedOperations = operationDetectorResults.Select(o => o.Operation).ToArray();

		for (int i = 0; i < operationDetectorResults.Count; i++)
		{
			var current = detectedOperations[i];
            var dateStart = current.DateStart.ToRemoteDateTime(well.Timezone.Hours);
			var dateEnd = current.DateEnd.ToRemoteDateTime(well.Timezone.Hours);

			var row = sheet.Row(5 + i + headerRowsCount);

			var categoryName = GetCategoryName(wellOperationCategories, current);
			
			row.Cell(columnOperationName).SetCellValue(categoryName);
			row.Cell(columnDateEnd).SetCellValue(dateEnd);
			row.Cell(columnDuration).SetCellValue((dateEnd - dateStart).TotalMinutes);
			row.Cell(columnDepthStart).SetCellValue(current.DepthStart);
			row.Cell(columnDepthEnd).SetCellValue(current.DepthEnd);
			row.Cell(columnDepth).SetCellValue(current.DepthEnd - current.DepthStart);

			if (current.ExtraData.TryGetValue("IdReasonOfEnd", out object? idReasonOfEndObject)
				&& idReasonOfEndObject is int idReasonOfEnd)
			{
				var reasonOfEnd = GetIdReasonOfEnd(idReasonOfEnd);
				row.Cell(columnIdReasonOfEnd).SetCellValue(reasonOfEnd);
			}

			var query = new QueryBuilder();
			query.Add("end", dateStart.AddSeconds(1800 * 0.9).ToString("yyyy-MM-ddTHH:mm:ss.fff"));
			query.Add("range", "1800");

			row.Cell(columnDateStart).SetCellValue(dateStart);
			
            var link = $"{host}/well/{well.Id}/telemetry/monitoring{query}";
			row.Cell(columnDateStart).SetHyperlink(link);
			
			var deltaDepth = i > 0 && i + 1 < detectedOperations.Length
				? current.DepthStart - detectedOperations[i - 1].DepthEnd
				: 0;
			row.Cell(columnDeltaDepth).SetCellValue(deltaDepth);

			var comment = CreateComment(operationDetectorResults[i]);
			row.Cell(columnComment).SetCellValue(comment);
		}
	}

    private static string GetCategoryName(IEnumerable<WellOperationCategory> wellOperationCategories, DetectedOperation current)
    {
		var idCategory = current.IdCategory;
		if (idCategory == WellOperationCategory.IdSlide &&
			EnabledSubsystemsFlags.AutoOscillation.HasEnabledSubsystems(current.EnabledSubsystems))
			return "Бурение в слайде с осцилляцией";

        var category = wellOperationCategories.FirstOrDefault(o => o.Id == current.IdCategory);
		
		if(category is not null)
			return category.Name;

		return $"Операция №{idCategory}";
    }

    private static string GetIdReasonOfEnd(int idReasonOfEnd)
    => idReasonOfEnd switch {
            0 => "Не определена",
			1 => "Не определено начало операции",
			101 => "Разница глубин забоя и положением долота",
			300 => "Низкое давление",
			_ => idReasonOfEnd.ToString($"Причина № {idReasonOfEnd}"),

        };

    private async Task<Stream> GetExcelTemplateStreamAsync(CancellationToken cancellationToken)
	{
		string resourceName = Assembly.GetExecutingAssembly()
			.GetManifestResourceNames()
			.FirstOrDefault(n => n.EndsWith("DetectOperations.xlsx"))!;

		using var stream = Assembly.GetExecutingAssembly()
			.GetManifestResourceStream(resourceName)!;

		var memoryStream = new MemoryStream();
		await stream.CopyToAsync(memoryStream, cancellationToken);
		memoryStream.Position = 0;

		return memoryStream;
	}
	
	private static string CreateComment(OperationDetectorResult operationDetectorResult)
	{
		var operation = operationDetectorResult.Operation;
		switch (operation.IdCategory)
		{
			case WellOperationCategory.IdRotor:
			case WellOperationCategory.IdSlide:
				var comment = "";
				if (operation.ExtraData.TryGetValue(DetectorDrilling.ExtraDataKeyAvgRotorSpeed, out object? oAvgRotorSpeed))
					comment += $"Средняя скорость оборотов ротора: {oAvgRotorSpeed}\r\n";

                if (operation.ExtraData.TryGetValue(DetectorDrilling.ExtraDataKeyDispersionOfNormalizedRotorSpeed, out object? oDispersionOfNormalizedRotorSpeed))
					comment += $"Дисперсия нормированных оборотов ротора: {oDispersionOfNormalizedRotorSpeed}";
						
				return comment;
			
			default:
				return string.Empty;
		}
	}

	private async Task<IEnumerable<OperationDetectorResult>> DetectOperationsAsync(int idTelemetry, DateTimeOffset begin,
		CancellationToken token)
	{
		var query = dbContext.TelemetryDataSaub
			.AsNoTracking()
			.Where(d => d.IdTelemetry == idTelemetry)
			.Where(d => d.BlockPosition >= 0)
			.Select(d => new DetectableTelemetry
			{
				DateTime = d.DateTime,
				IdUser = d.IdUser,
				WellDepth = d.WellDepth,
				Pressure = d.Pressure,
				HookWeight = d.HookWeight,
				BlockPosition = d.BlockPosition,
				BitDepth = d.BitDepth,
				RotorSpeed = d.RotorSpeed,
			})
			.OrderBy(d => d.DateTime);

		var startDate = begin;
		var detectedOperationResults = new List<OperationDetectorResult>(8);
		DetectedOperation? lastDetectedOperation = null;
		const int minOperationLength = 5;
		const int maxDetectorsInterpolationFrameLength = 30;
		const int gap = maxDetectorsInterpolationFrameLength + minOperationLength;

		while (true)
		{
			var data = await query
				.Where(d => d.DateTime > startDate)
				.ToArrayAsync(token);

			if (data.Length < gap)
				break;

			var isDetected = false;
			var positionBegin = 0;
			var positionEnd = data.Length - gap;
			while (positionEnd > positionBegin)
			{
				foreach (var detector in detectors)
				{
					if (!detector.TryDetect(idTelemetry, data, positionBegin, positionEnd, lastDetectedOperation, out var result))
						continue;
					
					detectedOperationResults.Add(result!);
					lastDetectedOperation = result!.Operation;
					isDetected = true;
					positionBegin = result.TelemetryEnd;
					break;
				}
				
				positionBegin += 1;
			}

			if (isDetected)
				startDate = lastDetectedOperation!.DateEnd;
			else
				startDate = data[positionEnd].DateTime;
		}

		return detectedOperationResults;
	}
}