using System.Collections.Immutable;
using StellaOps.Aoc;

namespace StellaOps.Concelier.Core.Aoc;

/// <summary>
/// Represents an Aggregation-Only Contract violation produced while validating a raw advisory document.
/// </summary>
public sealed class ConcelierAocGuardException : Exception
{
    public ConcelierAocGuardException(AocGuardResult result)
        : base("AOC guard validation failed for the provided raw advisory document.")
    {
        Result = result ?? throw new ArgumentNullException(nameof(result));
    }

    /// <summary>
    /// Guard evaluation result containing the individual violations.
    /// </summary>
    public AocGuardResult Result { get; }

    /// <summary>
    /// Collection of violations returned by the guard.
    /// </summary>
    public ImmutableArray<AocViolation> Violations => Result.Violations;

    /// <summary>
    /// Primary error code (`ERR_AOC_00x`) associated with the guard failure.
    /// </summary>
    public string PrimaryErrorCode =>
        Violations.IsDefaultOrEmpty ? "ERR_AOC_000" : Violations[0].ErrorCode;
}