using System.Linq;
using xCategoryService.Models.Dtos;
using xCategoryService.Providers.Dtos;
using xCommons.Extensions;

namespace xCategoryService.Extensions
{
    /// <summary>
    /// Extensions Method Related to XSubCategoryResourceDto ...
    /// </summary>
    public static class XSubCategoryResourceExtensions
    {
        /// <summary>
        /// Extract Available Languages ...
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static string[] ExtractLanguages(
            this XSubCategoryResourceDto source
        )
        {
            //
            var result = new string[] { };

            //
            // Validate ...
            if (!source.IsNullOrDefault())
            {
                return result;
            }

            //
            result =
                source.Titles.Locales.Select(x => x.Language)
                .Union(source.Descriptions.Locales.Select(x => x.Language))
                .Distinct()
                .ToArray();

            //
            return result;
        }

        /// <summary>
        /// Check Has Locale or not ...
        /// </summary>
        /// <param name="source"></param>
        /// <param name="language"></param>
        /// <returns></returns>
        public static bool HasLocale(
            this XSubCategoryResourceDto source,
            string language
        )
        {
            //
            var result =
                !language.IsNullOrEmpty() &&
                !source.IsNullOrDefault() &&
                source.Titles.Locales
                    .Any(l => l.Language
                        .Equals(
                            language,
                            System.StringComparison.InvariantCultureIgnoreCase));

            //
            return result;
        }

        /// <summary>
        /// Get Item Translation ...
        /// </summary>
        /// <param name="source"></param>
        /// <param name="language"></param>
        /// <returns></returns>
        public static XSubCategoryDto GetTranslate(
            this XSubCategoryResourceDto source,
            string language
        )
        {
            //
            XSubCategoryDto result = null;

            //
            var isValid = source
                .HasLocale(language);
            if (!isValid)
            {
                return result;
            }

            //
            var titleLocale = source.Titles.Locales
                .FirstOrDefault(l => l.Language
                    .Equals(
                        language,
                        System.StringComparison.InvariantCultureIgnoreCase));
            var descriptionLocale = source.Descriptions.Locales
                .FirstOrDefault(l => l.Language
                    .Equals(
                        language,
                        System.StringComparison.InvariantCultureIgnoreCase));

            //
            isValid = !titleLocale.IsNullOrDefault();
            if (!isValid)
            {
                return result;
            }

            //
            result = source.Item;
            result.Title = titleLocale.Value;
            result.Description =
                descriptionLocale.IsNullOrDefault()
                ? string.Empty
                : descriptionLocale.Value;

            //
            return result;
        }
    }
}