using System.Collections.Generic;

namespace StellaOps.Notify.WebService.Options;

/// <summary>
/// Strongly typed configuration for the Notify WebService host.
/// </summary>
public sealed class NotifyWebServiceOptions
{
    public const string SectionName = "notify";

    /// <summary>
    /// Schema version that downstream consumers can use to detect breaking changes.
    /// </summary>
    public int SchemaVersion { get; set; } = 1;

    /// <summary>
    /// Authority / authentication configuration.
    /// </summary>
    public AuthorityOptions Authority { get; set; } = new();

    /// <summary>
    /// Mongo storage configuration for configuration state and audit logs.
    /// </summary>
    public StorageOptions Storage { get; set; } = new();

    /// <summary>
    /// Plug-in loader configuration.
    /// </summary>
    public PluginOptions Plugins { get; set; } = new();

    /// <summary>
    /// HTTP API behaviour.
    /// </summary>
    public ApiOptions Api { get; set; } = new();

    /// <summary>
    /// Telemetry configuration toggles.
    /// </summary>
    public TelemetryOptions Telemetry { get; set; } = new();

    public sealed class AuthorityOptions
    {
        public bool Enabled { get; set; } = true;

        public bool AllowAnonymousFallback { get; set; }

        public string Issuer { get; set; } = "https://authority.local";

        public string? MetadataAddress { get; set; }

        public bool RequireHttpsMetadata { get; set; } = true;

        public int BackchannelTimeoutSeconds { get; set; } = 30;

        public int TokenClockSkewSeconds { get; set; } = 60;

        public IList<string> Audiences { get; set; } = new List<string> { "notify" };

        public string ReadScope { get; set; } = "notify.read";

        public string AdminScope { get; set; } = "notify.admin";

        /// <summary>
        /// Optional development signing key for symmetric JWT validation when Authority is disabled.
        /// </summary>
        public string? DevelopmentSigningKey { get; set; }
    }

    public sealed class StorageOptions
    {
        public string Driver { get; set; } = "mongo";

        public string ConnectionString { get; set; } = string.Empty;

        public string Database { get; set; } = "notify";

        public int CommandTimeoutSeconds { get; set; } = 30;
    }

    public sealed class PluginOptions
    {
        public string? BaseDirectory { get; set; }

        public string? Directory { get; set; }

        public IList<string> SearchPatterns { get; set; } = new List<string>();

        public IList<string> OrderedPlugins { get; set; } = new List<string>();
    }

    public sealed class ApiOptions
    {
        public string BasePath { get; set; } = "/api/v1/notify";

        public string InternalBasePath { get; set; } = "/internal/notify";

        public string TenantHeader { get; set; } = "X-StellaOps-Tenant";

        public RateLimitOptions RateLimits { get; set; } = new();
    }

    public sealed class RateLimitOptions
    {
        public RateLimitPolicyOptions DeliveryHistory { get; set; } = RateLimitPolicyOptions.CreateDefault(
            tokenLimit: 60,
            tokensPerPeriod: 30,
            replenishmentPeriodSeconds: 60,
            queueLimit: 20);

        public RateLimitPolicyOptions TestSend { get; set; } = RateLimitPolicyOptions.CreateDefault(
            tokenLimit: 5,
            tokensPerPeriod: 5,
            replenishmentPeriodSeconds: 60,
            queueLimit: 2);
    }

    public sealed class RateLimitPolicyOptions
    {
        public bool Enabled { get; set; } = true;

        public int TokenLimit { get; set; } = 10;

        public int TokensPerPeriod { get; set; } = 10;

        public int ReplenishmentPeriodSeconds { get; set; } = 60;

        public int QueueLimit { get; set; } = 0;

        public static RateLimitPolicyOptions CreateDefault(int tokenLimit, int tokensPerPeriod, int replenishmentPeriodSeconds, int queueLimit)
        {
            return new RateLimitPolicyOptions
            {
                TokenLimit = tokenLimit,
                TokensPerPeriod = tokensPerPeriod,
                ReplenishmentPeriodSeconds = replenishmentPeriodSeconds,
                QueueLimit = queueLimit
            };
        }
    }

    public sealed class TelemetryOptions
    {
        public bool EnableRequestLogging { get; set; } = true;

        public string MinimumLogLevel { get; set; } = "Information";
    }
}