using MangaReader.Core.HttpService;
using System.Globalization;
using System.Text;
using System.Text.RegularExpressions;

namespace MangaReader.Core.Search.NatoManga;

public class NatoMangaSearchProvider(IHttpService httpService) : MangaSearchProviderBase<NatoMangaSearchResult[]>(httpService)
{
    protected override string GetSearchUrl(string keyword)
    {
        string formattedSeachWord = GetFormattedSearchWord(keyword);

        return $"https://www.natomanga.com/home/search/json?searchword={formattedSeachWord}";
    }

    private static string GetFormattedSearchWord(string input)
    {
        if (string.IsNullOrWhiteSpace(input))
            return string.Empty;

        // Convert to lowercase and normalize to decompose accents
        string normalized = input.ToLowerInvariant()
            .Normalize(NormalizationForm.FormD);

        // Remove diacritics
        var sb = new StringBuilder();
        foreach (var c in normalized)
        {
            var unicodeCategory = CharUnicodeInfo.GetUnicodeCategory(c);
            if (unicodeCategory != UnicodeCategory.NonSpacingMark)
                sb.Append(c);
        }

        // Replace non-alphanumeric characters with underscores
        string cleaned = Regex.Replace(sb.ToString(), @"[^a-z0-9]+", "_");

        // Trim and collapse underscores
        cleaned = Regex.Replace(cleaned, "_{2,}", "_").Trim('_');

        return cleaned;
    }

    protected override MangaSearchResult[] GetSearchResult(NatoMangaSearchResult[] searchResult)
    {
        IEnumerable<MangaSearchResult> mangaSearchResults = searchResult.Select(searchResult =>
            new MangaSearchResult()
            {
                Source = "NatoManga",
                Title = searchResult.Name,
                Thumbnail = searchResult.Thumb,
                Url = searchResult.Url
            });

        return [.. mangaSearchResults];
    }
}