using System.Xml.Linq;
using CRIF.ACTion.Common.Builders;
using CRIF.ACTion.Common;
using CRIF.ACTion.Configuration;
using Landmark.OLA.Models.Loan;

namespace CRIF.ACTion.Files
{
    public class AddAppFilesSection : CrifRequestSection
    {
        public AddAppFilesSection(CrifSettings settings) : base(CrifNamespaces.Empty, "addAppFiles", settings)
        {}

        public virtual void SetLoanId(string loanId)
        {
            AddAttribute(new XAttribute("applicationID", loanId));
        }

        public virtual void SetFile(LoanApplicationFile file, string fileBase64Value)
        {
            XAttribute description;

            if (file.Section?.Length > 0) {
                description = new XAttribute(CrifNamespaces.Common + "description", $"{file.Section} - {file.SectionId}: {file.Description}");
            } else {
                description = new XAttribute(CrifNamespaces.Common + "description", $"{file.SectionId}: {file.Description}");
            }

            var addAppFilesElement = new XElement(CrifNamespaces.Common + "file",
                new XAttribute(CrifNamespaces.Common + "id", file.FileId),
                new XAttribute(CrifNamespaces.Common + "name", file.Name),
                description,
                new XAttribute(CrifNamespaces.Common + "size", CalculateFileSize(fileBase64Value)));

            addAppFilesElement.Add(new XElement(CrifNamespaces.Common + "formatType", new XAttribute(CrifNamespaces.Common + "CD", GetFormatType())));

            addAppFilesElement.Add(new XElement(CrifNamespaces.Common + "formatCategory", new XAttribute(CrifNamespaces.Common + "CD", GetFormatCategory(file.Description))));

            var fileElement = new XElement(CrifNamespaces.Common + "file");
            fileElement.SetValue(fileBase64Value);

            addAppFilesElement.Add(fileElement);

            AddContent(addAppFilesElement);
        }

        public static string CalculateFileSize(string fileBase64Value)
        {
            int size = fileBase64Value.Length / 4 * 3;

            if (fileBase64Value.EndsWith("=="))
            {
                size -= 2;
            }
            else if (fileBase64Value.EndsWith("="))
            {
                size -= 1;
            }

            return size.ToString();
        }

        public int GetFormatType()
        {
            // Always return 1 since it seems that there are no other types used. Creating this in case that ever changes.
            return 1;
        }

        // Configurable in appsettings.json, defaults to 1
        public int GetFormatCategory(string description)
        {
            try
            {
                var category = _settings.FormatCategoryMappings.DocumentToCategory.GetValueOrDefault(description, "Attachment");
                return _settings.FormatCategoryMappings.Categories.GetValueOrDefault(category, 1);
            } catch (Exception)
            {
                return 1;
            }
        }
    }
}