using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;

namespace StellaOps.Scanner.Analyzers.OS;

public sealed class OSPackageAnalyzerResult
{
    private static readonly IReadOnlyList<OSPackageRecord> EmptyPackages =
        new ReadOnlyCollection<OSPackageRecord>(Array.Empty<OSPackageRecord>());

    private static readonly IReadOnlyList<AnalyzerWarning> EmptyWarnings =
        new ReadOnlyCollection<AnalyzerWarning>(Array.Empty<AnalyzerWarning>());

    public OSPackageAnalyzerResult(
        string analyzerId,
        IEnumerable<OSPackageRecord>? packages,
        OSAnalyzerTelemetry telemetry,
        IEnumerable<AnalyzerWarning>? warnings = null)
    {
        ArgumentException.ThrowIfNullOrWhiteSpace(analyzerId);
        AnalyzerId = analyzerId.Trim();
        Packages = packages is null
            ? EmptyPackages
            : new ReadOnlyCollection<OSPackageRecord>(packages.ToArray());
        Telemetry = telemetry;
        Warnings = warnings is null
            ? EmptyWarnings
            : new ReadOnlyCollection<AnalyzerWarning>(warnings.ToArray());
    }

    public string AnalyzerId { get; }

    public IReadOnlyList<OSPackageRecord> Packages { get; }

    public OSAnalyzerTelemetry Telemetry { get; }

    public IReadOnlyList<AnalyzerWarning> Warnings { get; }
}