using System;
using Svrnty.CQRS.Events.Abstractions.Models;
using System.Collections.Generic;

namespace Svrnty.CQRS.Events.Abstractions.Models;

/// <summary>
/// Status of a health check.
/// </summary>
public enum HealthStatus
{
    /// <summary>
    /// The component is healthy.
    /// </summary>
    Healthy = 0,

    /// <summary>
    /// The component is degraded but still functional.
    /// </summary>
    Degraded = 1,

    /// <summary>
    /// The component is unhealthy.
    /// </summary>
    Unhealthy = 2
}

/// <summary>
/// Result of a health check operation.
/// </summary>
public sealed record HealthCheckResult
{
    /// <summary>
    /// Overall health status.
    /// </summary>
    public required HealthStatus Status { get; init; }

    /// <summary>
    /// Optional description of the health status.
    /// </summary>
    public string? Description { get; init; }

    /// <summary>
    /// Exception that occurred during the health check, if any.
    /// </summary>
    public Exception? Exception { get; init; }

    /// <summary>
    /// Additional data about the health check.
    /// </summary>
    public IReadOnlyDictionary<string, object>? Data { get; init; }

    /// <summary>
    /// Time taken to perform the health check.
    /// </summary>
    public TimeSpan Duration { get; init; }

    /// <summary>
    /// Creates a healthy result.
    /// </summary>
    public static HealthCheckResult Healthy(string? description = null, IReadOnlyDictionary<string, object>? data = null, TimeSpan duration = default)
        => new()
        {
            Status = HealthStatus.Healthy,
            Description = description,
            Data = data,
            Duration = duration
        };

    /// <summary>
    /// Creates a degraded result.
    /// </summary>
    public static HealthCheckResult Degraded(string? description = null, Exception? exception = null, IReadOnlyDictionary<string, object>? data = null, TimeSpan duration = default)
        => new()
        {
            Status = HealthStatus.Degraded,
            Description = description,
            Exception = exception,
            Data = data,
            Duration = duration
        };

    /// <summary>
    /// Creates an unhealthy result.
    /// </summary>
    public static HealthCheckResult Unhealthy(string? description = null, Exception? exception = null, IReadOnlyDictionary<string, object>? data = null, TimeSpan duration = default)
        => new()
        {
            Status = HealthStatus.Unhealthy,
            Description = description,
            Exception = exception,
            Data = data,
            Duration = duration
        };
}