using AvParser.Core.Parsing;
using AvParser.UI.Localization;
using ReactiveUI;

namespace AvParser.UI.ViewModels;

/// <summary>One row of the collect error list, with its message translated.</summary>
/// <remarks>
/// Sources and the fetcher are part of the domain and produce English text plus a code. This resolves
/// <c>Collect.Error.{Code}</c> and falls back to the domain's own wording, so a code that has not
/// been translated yet still says something useful instead of showing a missing-key marker.
/// </remarks>
public sealed class CollectErrorViewModel(ParseError error) : ReactiveObject
{
    /// <summary>The underlying error.</summary>
    public ParseError Error { get; } = error ?? throw new ArgumentNullException(nameof(error));

    /// <summary>1-based position of the offending item: a pasted line, or a place in a listing.</summary>
    public int Index => Error.Index;

    /// <summary>Translated message.</summary>
    public string Text
    {
        get
        {
            if (Error.Code is not { Length: > 0 } code)
            {
                return Error.Message;
            }

            var template = Localizer.Instance.GetOrDefault($"Collect.Error.{code}", Error.Message);
            return Error.Arguments.Count == 0
                ? template
                : string.Format(Localizer.Instance.Culture, template, [.. Error.Arguments]);
        }
    }

    /// <summary>Re-reads the translated message.</summary>
    public void Refresh() => this.RaisePropertyChanged(nameof(Text));
}