using System.Globalization;

namespace OI.Metrology.Server.Services;

using OI.Metrology.Server.Models;
using OI.Metrology.Shared.DataModels;
using OI.Metrology.Shared.Models;
using OI.Metrology.Shared.Models.Stateless;
using OI.Metrology.Shared.Services;
using System.Text.Json;

public class AttachmentsService : IAttachmentsService
{

    private readonly AppSettings _AppSettings;
    private readonly IHttpClientFactory _HttpClientFactory;
    private readonly IFileShareRepository _FileShareRepository;
    private readonly IMetrologyRepository _MetrologyRepository;

    public AttachmentsService(AppSettings appSettings, IHttpClientFactory httpClientFactory, IFileShareRepository fileShareRepository, IMetrologyRepository metrologyRepository)
    {
        _AppSettings = appSettings;
        _HttpClientFactory = httpClientFactory;
        _FileShareRepository = fileShareRepository;
        _MetrologyRepository = metrologyRepository;
    }

    protected Stream GetAttachmentStream(string? tableName, Guid attachmentId, string filename)
    {
        if (attachmentId.Equals(Guid.Empty))
            throw new Exception("No attachments found");

        if (tableName is null)
            throw new NullReferenceException(nameof(tableName));

        DateTime insertDate = Convert.ToDateTime(_MetrologyRepository.GetAttachmentInsertDateByGUID(tableName, attachmentId));

        string year = insertDate.Year.ToString();
        HttpClient httpClient = _HttpClientFactory.CreateClient();
        Uri mesaFileShareMetrologySi = new(_AppSettings.EcMesaFileShareMetrologySi);
        int weekNum = CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(insertDate, CalendarWeekRule.FirstDay, DayOfWeek.Sunday);
        Uri uri = _FileShareRepository.Append(mesaFileShareMetrologySi, "MetrologyAttachments", $"{tableName}_", year, $"WW{weekNum:00}", attachmentId.ToString(), filename);
        HttpResponseMessage httpResponseMessage = _FileShareRepository.ReadFile(httpClient, uri);
        if (httpResponseMessage.StatusCode != System.Net.HttpStatusCode.OK)
            throw new Exception("File not found!");
        return httpResponseMessage.Content.ReadAsStream();
    }

    Stream IAttachmentsService.GetAttachmentStreamByTitle(ToolType toolType, bool header, string title, string filename)
    {
        if (toolType is null)
            throw new Exception("Invalid tool type");
        Guid attachmentId;
        string? tableName;
        if (header)
        {
            tableName = toolType.HeaderTableName;
            attachmentId = _MetrologyRepository.GetHeaderAttachmentIDByTitle(toolType.ID, title);
        }
        else
        {
            tableName = toolType.DataTableName;
            attachmentId = _MetrologyRepository.GetDataAttachmentIDByTitle(toolType.ID, title);
        }
        return GetAttachmentStream(tableName, attachmentId, filename);
    }

    Stream IAttachmentsService.GetAttachmentStreamByAttachmentId(ToolType toolType, bool header, Guid attachmentId, string filename)
    {
        if (toolType is null)
            throw new Exception("Invalid tool type");
        string? tableName;
        if (header)
            tableName = toolType.HeaderTableName;
        else
            tableName = toolType.DataTableName;
        return GetAttachmentStream(tableName, attachmentId, filename);
    }

    void IAttachmentsService.SaveAttachment(ToolType toolType, Attachment attachment)
    {
        if (toolType is null)
            throw new Exception("Invalid tool type");
        if (attachment.HeaderId is null)
            throw new NullReferenceException($"{nameof(attachment.HeaderId)}");
        if (attachment.AttachmentId is null)
            throw new NullReferenceException($"{nameof(attachment.AttachmentId)}");
        if (attachment.DestinationFileName is null)
            throw new NullReferenceException($"{nameof(attachment.DestinationFileName)}");
        if (string.IsNullOrWhiteSpace(attachment.UniqueId))
            throw new NullReferenceException($"{nameof(attachment.UniqueId)}");
        if (attachment.DestinationFileName != "Image.pdf")
            _MetrologyRepository.SetHeaderAttachmentID(toolType.ID, attachment.HeaderId.Value, attachment.AttachmentId);
        else
            _MetrologyRepository.SetDataAttachmentID(toolType.ID, attachment.HeaderId.Value, attachment.UniqueId, attachment.AttachmentId);
    }

    string? IAttachmentsService.GetProcessDataStandardFormat(IMetrologyRepository metrologyRepository, int toolTypeId, long headerId)
    {
        string? result;
        int weekNum;
        string file;
        string year;
        string directory;
        Task<string> json;
        Uri weekDirectory;
        Uri checkDirectory;
        List<string> files = new();
        string[] collection = ["-", string.Empty];
        NginxFileSystem[]? nginxFileSystemCollection;
        Task<HttpResponseMessage> httpResponseMessage;
        HttpClient httpClient = _HttpClientFactory.CreateClient();
        Uri mesaFileShareMetrologySi = new(_AppSettings.EcMesaFileShareMetrologySi);
        DateTime[] dateTimes = new DateTime[] { DateTime.Now, DateTime.Now.AddDays(-6.66) };
        ToolType toolType = metrologyRepository.GetToolTypeByID(toolTypeId) ?? throw new Exception("Invalid tool type ID");
        foreach (DateTime dateTime in dateTimes)
        {
            foreach (string item in collection)
            {
                year = dateTime.Year.ToString();
                weekNum = CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(dateTime, CalendarWeekRule.FirstDay, DayOfWeek.Sunday);
                weekDirectory = _FileShareRepository.Append(mesaFileShareMetrologySi, "MetrologyAttachments", $"{toolType.HeaderTableName}_", year, $"WW{weekNum:00}");
                checkDirectory = _FileShareRepository.Append(weekDirectory, $"{item}{headerId}");
                directory = Path.Combine(_AppSettings.EcMetrologySi, "MetrologyAttachments", $"{toolType.HeaderTableName}_", year, $"WW{weekNum:00}", $"{item}{headerId}");
                httpResponseMessage = httpClient.GetAsync(checkDirectory);
                httpResponseMessage.Wait();
                if (httpResponseMessage.Result.StatusCode != System.Net.HttpStatusCode.OK)
                    continue;
                json = httpResponseMessage.Result.Content.ReadAsStringAsync();
                json.Wait();
                nginxFileSystemCollection = JsonSerializer.Deserialize(json.Result, NginxFileSystemCollectionSourceGenerationContext.Default.NginxFileSystemArray);
                if (nginxFileSystemCollection is null)
                    continue;
                foreach (NginxFileSystem nginxFileSystem in nginxFileSystemCollection)
                {
                    if (!nginxFileSystem.Name.EndsWith(".pdsf"))
                        continue;
                    file = Path.Combine(directory, nginxFileSystem.Name);
                    files.Add(file);
                }
                if (files.Count != 0)
                    break;
            }
            if (files.Count != 0)
                break;
        }
        result = files.Count == 0 ? null : files.First();
        return result;
    }

}