using YamlDotNet.Serialization;
using YamlDotNet.Serialization.NamingConventions;
using Yavsc.Server.Models.Billing;

namespace Yavsc.Server.Services;

public static class FrontmatterParser
{
    public  const string YamlSeparator = "---";

    private static readonly IDeserializer _deserializer =
        new DeserializerBuilder()
            .WithNamingConvention(CamelCaseNamingConvention.Instance)
            .IgnoreUnmatchedProperties()
            .Build();

    public static FrontmatterOffreResult Parse(string markdown)
    {
        // Le contenu doit commencer par ----
        if (!markdown.TrimStart().StartsWith(YamlSeparator))
            return new FrontmatterOffreResult { Corps = markdown };
        var parts = markdown.TrimStart()[3..].Split(new[] { "\n"+YamlSeparator }, 2,
                           StringSplitOptions.None);
        if (parts.Length < 2)
            return new FrontmatterOffreResult { Corps = markdown };
        var yamlBlock = parts[0].Trim();
        var corps     = parts[1].Trim();
        var meta = _deserializer.Deserialize<FrontmatterOffreResult>(yamlBlock);
        meta.Corps = corps;
        return meta;
    }
}