using System;
using System.Collections.Generic;

namespace Svrnty.CQRS.Events.Abstractions.Configuration;

/// <summary>
/// Configuration for stream performance tuning.
/// </summary>
public class PerformanceConfiguration
{
    /// <summary>
    /// Gets or sets the batch size for bulk operations.
    /// </summary>
    public int? BatchSize { get; set; }

    /// <summary>
    /// Gets or sets whether to enable compression for stored events.
    /// </summary>
    public bool? EnableCompression { get; set; }

    /// <summary>
    /// Gets or sets the compression algorithm to use (e.g., "gzip", "zstd").
    /// </summary>
    public string? CompressionAlgorithm { get; set; }

    /// <summary>
    /// Gets or sets whether to enable indexing on metadata fields.
    /// </summary>
    public bool? EnableIndexing { get; set; }

    /// <summary>
    /// Gets or sets the list of metadata fields to index.
    /// </summary>
    public List<string>? IndexedFields { get; set; }

    /// <summary>
    /// Gets or sets the cache size for frequently accessed events.
    /// </summary>
    public int? CacheSize { get; set; }

    /// <summary>
    /// Validates the performance configuration.
    /// </summary>
    /// <exception cref="ArgumentException">Thrown when configuration is invalid.</exception>
    public void Validate()
    {
        if (BatchSize.HasValue && BatchSize.Value <= 0)
            throw new ArgumentException("BatchSize must be positive", nameof(BatchSize));

        if (EnableCompression == true && string.IsNullOrWhiteSpace(CompressionAlgorithm))
            throw new ArgumentException("CompressionAlgorithm must be specified when EnableCompression is true", nameof(CompressionAlgorithm));

        if (EnableIndexing == true && (IndexedFields == null || IndexedFields.Count == 0))
            throw new ArgumentException("IndexedFields must be specified when EnableIndexing is true", nameof(IndexedFields));

        if (CacheSize.HasValue && CacheSize.Value < 0)
            throw new ArgumentException("CacheSize cannot be negative", nameof(CacheSize));
    }
}