using Manager.DTOs;
using ManagerService.DTOs;
using System;
using System.Collections.Generic;
using System.Linq;

namespace ManagerService.Data
{
    /// <summary>
    /// Briques communes à <see cref="Section.GetEmbeddableText"/> et
    /// <see cref="Section.GetReferencedResourceIds"/>. Sorties de <see cref="Section"/> parce que
    /// les structures parcourues (GeoPoint, GuidedStep, EventAgenda…) n'en héritent pas.
    /// </summary>
    public static class SectionText
    {
        public static string Translate(IEnumerable<TranslationDTO> translations, string language) =>
            translations?.FirstOrDefault(t => string.Equals(t.language, language, StringComparison.OrdinalIgnoreCase))?.value;

        public static string Translate(IEnumerable<TranslationAndResourceDTO> translations, string language) =>
            translations?.FirstOrDefault(t => string.Equals(t.language, language, StringComparison.OrdinalIgnoreCase))?.value;

        public static string TranslateContents(IEnumerable<ContentDTO> contents, string language) =>
            JoinText((contents ?? Enumerable.Empty<ContentDTO>())
                .OrderBy(c => c.order ?? 0)
                .SelectMany(c => new[] { Translate(c.title, language), Translate(c.description, language) })
                .ToArray());

        public static string JoinText(params string[] parts) =>
            string.Join("\n", parts.Where(p => !string.IsNullOrWhiteSpace(p)));

        public static IEnumerable<string> ResourceId(string id) =>
            string.IsNullOrWhiteSpace(id) ? Enumerable.Empty<string>() : new[] { id };

        /// <summary>
        /// Champs où la valeur traduite <em>est</em> un id de ressource (audios, PDF, JSON d'agenda),
        /// et non du texte à afficher.
        /// </summary>
        public static IEnumerable<string> ResourceIdsFromValues(IEnumerable<TranslationDTO> translations, string language) =>
            (translations ?? Enumerable.Empty<TranslationDTO>())
                .Where(t => language == null || string.Equals(t.language, language, StringComparison.OrdinalIgnoreCase))
                .SelectMany(t => ResourceId(t.value));

        public static IEnumerable<string> ResourceIds(IEnumerable<TranslationAndResourceDTO> translations, string language) =>
            (translations ?? Enumerable.Empty<TranslationAndResourceDTO>())
                .Where(t => language == null || string.Equals(t.language, language, StringComparison.OrdinalIgnoreCase))
                .SelectMany(t => ResourceId(t.resourceId));

        public static IEnumerable<string> ResourceIds(IEnumerable<ContentDTO> contents) =>
            (contents ?? Enumerable.Empty<ContentDTO>()).SelectMany(c => ResourceId(c.resourceId));
    }
}