using ECMJobRunner.Application.Common.Dtos;
using System.Collections.Concurrent;

namespace ECMJobRunner.WebCron.ProfileWorker;

/// <summary>
/// Thread-safe cache for storing active profile configurations.
/// Uses <see cref="ConcurrentDictionary{TKey, TValue}"/> to track profile state 
/// and detect changes in schedule or removal.
/// </summary>
public class ProfileCache
{
    private readonly ConcurrentDictionary<string, CfgProfileDto> _cache = new();

    /// <summary>
    /// Retrieves a profile from the cache by job identifier.
    /// </summary>
    /// <param name="jobId">The unique job identifier.</param>
    /// <returns>The cached profile, or <c>null</c> if not found.</returns>
    public CfgProfileDto? Get(string jobId) => _cache.TryGetValue(jobId, out var profile) ? profile : null;

    /// <summary>
    /// Adds a new profile or updates an existing profile in the cache.
    /// </summary>
    /// <param name="jobId">The unique job identifier.</param>
    /// <param name="profile">The profile configuration to cache.</param>
    public void AddOrUpdate(string jobId, CfgProfileDto profile) => _cache[jobId] = profile;

    /// <summary>
    /// Attempts to remove a profile from the cache.
    /// </summary>
    /// <param name="jobId">The unique job identifier.</param>
    /// <param name="profile">The removed profile, or <c>null</c> if not found.</param>
    /// <returns><c>true</c> if the profile was removed; otherwise, <c>false</c>.</returns>
    public bool TryRemove(string jobId, out CfgProfileDto? profile) => _cache.TryRemove(jobId, out profile);

    /// <summary>
    /// Gets all job identifiers currently stored in the cache.
    /// </summary>
    /// <returns>A collection of job identifiers.</returns>
    public IEnumerable<string> GetAllJobIds() => _cache.Keys;

    /// <summary>
    /// Attempts to retrieve a profile from the cache.
    /// </summary>
    /// <param name="jobId">The unique job identifier.</param>
    /// <param name="profile">The cached profile, or <c>null</c> if not found.</param>
    /// <returns><c>true</c> if the profile was found; otherwise, <c>false</c>.</returns>
    public bool TryGetValue(string jobId, out CfgProfileDto? profile) => _cache.TryGetValue(jobId, out profile);
}