using System.Text.Json.Serialization;

namespace EnvelopeGenerator.Web.Models;

public class AnnotationParams
{
    [JsonIgnore]
    public Annotation? DefaultAnnotation { get; init; }

    private readonly IEnumerable<Annotation> _annots = new List<Annotation>();

    public Annotation this[string name] => _annots.First(a => a.Name == name);

    public bool TryGet(string name, out Annotation annotation)
    {
#pragma warning disable CS8601 // Possible null reference assignment.
        annotation = _annots.FirstOrDefault(a => a.Name == name);
#pragma warning restore CS8601 // Possible null reference assignment.
        return annotation is not null;
    }

    [JsonIgnore]
    public IEnumerable<string> Names => _annots.Select(annot => annot.Name);

    public required IEnumerable<Annotation> Annotations
    {
        get => _annots;
        init
        {
            _annots = value;

            if (DefaultAnnotation is not null)
                foreach (var annot in _annots)
                    annot.Default = DefaultAnnotation;

            foreach (var name in Names)
            {
                #region set bound annotations
                // horizontal
                if (this[name].HorBoundAnnotName is string horBoundAnnotName)
                    if (TryGet(horBoundAnnotName, out var horBoundAnnot))
                        this[name].HorBoundAnnot = horBoundAnnot;
                    else
                        throw new InvalidOperationException($"{horBoundAnnotName} added as bound anotation. However, it is not defined.");

                // vertical
                if (this[name].VerBoundAnnotName is string verBoundAnnotName)
                    if (TryGet(verBoundAnnotName, out var verBoundAnnot))
                        this[name].VerBoundAnnot = verBoundAnnot;
                    else
                        throw new InvalidOperationException($"{verBoundAnnotName} added as bound anotation. However, it is not defined.");
                #endregion
            }
        }
    }
}