namespace StellaOps.AdvisoryAI.Remediation;

/// <summary>
/// Authority level of the remediation plan.
/// </summary>
public enum RemediationAuthority
{
    /// <summary>
    /// Verified: build passed, tests passed, delta verified.
    /// </summary>
    Verified,

    /// <summary>
    /// Suggestion: requires human review (build/tests failed or not run).
    /// </summary>
    Suggestion,

    /// <summary>
    /// Draft: initial plan not yet verified.
    /// </summary>
    Draft
}

/// <summary>
/// Risk level of the remediation.
/// </summary>
public enum RemediationRisk
{
    /// <summary>
    /// Low risk: patch version bump.
    /// </summary>
    Low,

    /// <summary>
    /// Medium risk: minor version bump.
    /// </summary>
    Medium,

    /// <summary>
    /// High risk: major version bump or breaking changes.
    /// </summary>
    High,

    /// <summary>
    /// Unknown risk: unable to determine.
    /// </summary>
    Unknown
}

/// <summary>
/// A single step in a remediation plan.
/// </summary>
public sealed record RemediationStep
{
    /// <summary>
    /// Step number (1-based).
    /// </summary>
    public required int Order { get; init; }

    /// <summary>
    /// Type of action (update_package, update_lockfile, update_config, run_command, etc.).
    /// </summary>
    public required string ActionType { get; init; }

    /// <summary>
    /// File path affected.
    /// </summary>
    public required string FilePath { get; init; }

    /// <summary>
    /// Description of the change.
    /// </summary>
    public required string Description { get; init; }

    /// <summary>
    /// Previous value (for diff).
    /// </summary>
    public string? PreviousValue { get; init; }

    /// <summary>
    /// New value (for diff).
    /// </summary>
    public string? NewValue { get; init; }

    /// <summary>
    /// Whether this step is optional.
    /// </summary>
    public bool Optional { get; init; }

    /// <summary>
    /// Risk assessment for this step.
    /// </summary>
    public RemediationRisk Risk { get; init; } = RemediationRisk.Low;
}

/// <summary>
/// Expected SBOM delta after remediation.
/// </summary>
public sealed record ExpectedSbomDelta
{
    /// <summary>
    /// Components to be added.
    /// </summary>
    public required IReadOnlyList<string> Added { get; init; }

    /// <summary>
    /// Components to be removed.
    /// </summary>
    public required IReadOnlyList<string> Removed { get; init; }

    /// <summary>
    /// Components to be upgraded (old_purl → new_purl).
    /// </summary>
    public required IReadOnlyDictionary<string, string> Upgraded { get; init; }

    /// <summary>
    /// Net vulnerability change (negative = improvement).
    /// </summary>
    public required int NetVulnerabilityChange { get; init; }
}

/// <summary>
/// Test requirements for verifying remediation.
/// </summary>
public sealed record RemediationTestRequirements
{
    /// <summary>
    /// Required test suites to run.
    /// </summary>
    public required IReadOnlyList<string> TestSuites { get; init; }

    /// <summary>
    /// Minimum coverage required.
    /// </summary>
    public double MinCoverage { get; init; }

    /// <summary>
    /// Whether all tests must pass.
    /// </summary>
    public bool RequireAllPass { get; init; } = true;

    /// <summary>
    /// Timeout for test execution.
    /// </summary>
    public TimeSpan Timeout { get; init; } = TimeSpan.FromMinutes(30);
}

/// <summary>
/// A complete remediation plan.
/// Sprint: SPRINT_20251226_016_AI_remedy_autopilot
/// Task: REMEDY-05
/// </summary>
public sealed record RemediationPlan
{
    /// <summary>
    /// Unique plan ID.
    /// </summary>
    public required string PlanId { get; init; }

    /// <summary>
    /// Original request.
    /// </summary>
    public required RemediationPlanRequest Request { get; init; }

    /// <summary>
    /// Remediation steps to apply.
    /// </summary>
    public required IReadOnlyList<RemediationStep> Steps { get; init; }

    /// <summary>
    /// Expected SBOM delta.
    /// </summary>
    public required ExpectedSbomDelta ExpectedDelta { get; init; }

    /// <summary>
    /// Overall risk assessment.
    /// </summary>
    public required RemediationRisk RiskAssessment { get; init; }

    /// <summary>
    /// Test requirements.
    /// </summary>
    public required RemediationTestRequirements TestRequirements { get; init; }

    /// <summary>
    /// Authority classification.
    /// </summary>
    public required RemediationAuthority Authority { get; init; }

    /// <summary>
    /// PR-ready flag (true if plan can be applied automatically).
    /// </summary>
    public required bool PrReady { get; init; }

    /// <summary>
    /// Reason if not PR-ready.
    /// </summary>
    public string? NotReadyReason { get; init; }

    /// <summary>
    /// Confidence score (0.0-1.0).
    /// </summary>
    public required double ConfidenceScore { get; init; }

    /// <summary>
    /// Model ID used for generation.
    /// </summary>
    public required string ModelId { get; init; }

    /// <summary>
    /// Generated timestamp (UTC ISO-8601).
    /// </summary>
    public required string GeneratedAt { get; init; }

    /// <summary>
    /// Input hashes for replay.
    /// </summary>
    public required IReadOnlyList<string> InputHashes { get; init; }

    /// <summary>
    /// Evidence refs used in planning.
    /// </summary>
    public required IReadOnlyList<string> EvidenceRefs { get; init; }
}