using System.Text.RegularExpressions;
using GeradoresService.Core;
using GeradoresService.Data;

namespace GeradoresService.Generators.Contactos;

/// <summary>Código postal português (NNNN-NNN). Apenas formato.</summary>
public sealed partial class CodigoPostalGenerator : GeneratorBase
{
    public override string Id => "codigo-postal";
    public override string Name => "Código postal";
    public override string Category => Categories.Contactos;
    public override string Description => "Código postal português (CP4-CP3) com localidade.";
    public override bool HasChecksum => false;

    public override GeneratedItem Generate(GeneratorContext context)
    {
        var (cp, locality, district) = Random(context);
        return new GeneratedItem(cp, new Dictionary<string, string>
        {
            ["Código postal"] = cp,
            ["Localidade"] = locality,
            ["Distrito"] = district,
        });
    }

    public static (string Cp, string Locality, string District) Random(GeneratorContext context)
    {
        var l = context.Pick(PtData.Localities);
        return ($"{l.Cp4}-{1 + context.Random.Next(999):D3}", l.Locality, l.District);
    }

    public override ValidationResult Validate(string value)
    {
        var m = Pattern().Match(value.Trim());
        if (!m.Success)
            return ValidationResult.WrongFormat("Formato esperado: NNNN-NNN (ex.: 1000-001).");
        var cp = $"{m.Groups[1].Value}-{m.Groups[2].Value}";
        return ValidationResult.Valid(cp, "Formato de código postal válido.");
    }

    [GeneratedRegex(@"^([1-9]\d{3})[-\s]?(\d{3})$")]
    private static partial Regex Pattern();
}