// SPDX-FileCopyrightText: 2026 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only

#pragma once

#include <optional>
#include "JFJochException.h"

// How the high-resolution cutoff for the written reflections and the reported shell table is chosen
// when no explicit --scaling-high-resolution is given. Off = keep the full (detector-edge) range;
// CCHalfLogistic = fit the CC1/2 fall-off and cut one shell past cc_target (DIALS-style, generous).
enum class ResolutionCutoffMethod { Off, CCHalfLogistic };

class ScalingSettings {
    bool refine_wedge = false;

    bool merge_friedel = true;
    std::optional<double> high_resolution_limit_A;
    std::optional<double> wedge_for_scaling;
    std::optional<double> forced_mosaicity;   // diagnostic: fix the scaling mosaicity (deg) instead of the per-image seed
    double min_partiality = 0.02;
    // Capture-aware systematic uncertainty for the rot3d combine: a full reconstructed from only
    // a fraction f<1 of its rocking curve is extrapolated, and the unobserved (1-f) carries a
    // systematic error ~coeff*(1-f)*I that plain counting sigma misses. 0 = off (baseline).
    double capture_uncertainty_coeff = 0.0;
    // Full-level captured-fraction floor for the rot3d combine: drop a reconstructed full whose rocking
    // curve was only fractionally captured (sum of its partials' partiality < this). Distinct from
    // min_partiality, which gates individual partials; this gates the assembled full. 0 = off (baseline).
    double min_captured_fraction = 0.0;
    double min_cc_for_image = 0.0;

    // Exclude observations whose Lorentz geometry |zeta| falls below this from the DE-NOVO space-group
    // search merge only (see RotationScaleMerge::search_min_zeta). 0 = off.
    double search_min_zeta = 0.0;
    double outlier_reject_nsigma = 0.0; // per-observation merge outlier rejection (XDS/DIALS-style); 0 = off, e.g. 6 enables

    // Scale fulls: after the rotation 3D combine, refit a per-frame scale on the combined fulls (XDS
    // order). Only used by the rotation path (RotationScaleMerge).
    bool scale_fulls = false;

    // Correction surfaces fitted on the rot3d fulls after scale-fulls: a decay (per-run Debye-Waller B)
    // and an absorption surface (over the diffracted-beam direction in the goniometer frame). Both are
    // cross-validated, so they no-op when their systematic is absent - hence ON by default (they only ever
    // help or do nothing). No-op without rot3d. Set false to disable both.
    bool correction_surfaces = true;
    // Absorption-surface refinement iteration count (used when correction_surfaces is on).
    int absorption_iter = 3;

    // Physical partiality post-refinement for the STILLS merge (StillsPartialityRefine): refine a per-crystal
    // orientation tilt against the running merge, recompute each reflection's partiality from the refined
    // geometry (angular Ewald-proximity model), and re-scale/merge - the "full model" for stills. ON by
    // default (helps mono stills, neutral on pink beam, tames weak data via a soft prior). rugnux
    // --simple-stills turns it OFF, reverting to treating every reflection as a full (p = 1, single pass).
    bool stills_partiality_refine = true;

    // Expected-variance merge weighting for the STILLS merge (MergeOnTheFly). When combining a reflection's
    // redundant observations by inverse variance, rebuild the Poisson signal part of each observation's
    // variance at the reflection's EXPECTED <I> instead of the observation's own intensity. Weighting by an
    // observation's own sigma^2 biases the inverse-variance mean low at <1 photon (an up-fluctuated
    // observation gets a larger sigma and is over-downweighted). Default on - it mirrors the rotation combine
    // (RotationScaleMerge::process_rawrun), which already does this, and is R-free-neutral on strong data and
    // better on weak. --no-expected-variance-merge restores the old observed-sigma weighting.
    bool expected_variance_merge = true;

    // Smooth the per-frame scale G across frames (centered moving average of log G) before the rot3d
    // combine, so a rocking event's partials share a consistent scale. Given as a ROTATION RANGE in
    // degrees (like XDS DELPHI), converted to an odd frame window from the oscillation step; this keeps
    // the smoothing physical (independent of frame slicing). 0 = off. A no-op without rot3d.
    double smooth_g_deg = 0.0;

    // Per-batch relative-B on the rot3d fulls (beyond the single global decay slope): bin frames into
    // rotation-range batches of this width in degrees and refine one relative Debye-Waller B per batch, so
    // NON-monotonic changes in scattering power across the run (absorption path, crystal slippage, dose
    // bursts) are corrected the resolution-flat per-frame G and the single decay slope both miss. Cross-
    // validated + zero-mean-anchored, so a no-op when absent. 0 = off. A no-op without rot3d.
    double relative_b_deg = 0.0;

    double rfree_fraction = 0.05;

    // Automatic high-resolution cutoff for the written reflections + reported shells (not the scaling
    // or the error model, and not the per-image _process.h5). Applied only when no explicit
    // high_resolution_limit_A is set - that manual limit always wins and disables the auto-cut.
    ResolutionCutoffMethod resolution_cutoff = ResolutionCutoffMethod::CCHalfLogistic;
    double resolution_cc_target = 0.30;   // CC1/2 value defining the fall-off limit before the +1 shell
    int report_shell_count = 10;          // number of resolution shells in the reported statistics table

public:
    ScalingSettings& RefineRotationWedge(bool input);
    ScalingSettings& RotationWedgeForScaling(std::optional<double> input);
    ScalingSettings& MergeFriedel(bool input);
    ScalingSettings& HighResolutionLimit_A(double limit);
    ScalingSettings& HighResolutionLimit_A(std::optional<double> limit);   // nullopt clears the limit
    ScalingSettings& MinPartiality(double min_partiality);
    ScalingSettings& ForcedMosaicity(std::optional<double> input);
    ScalingSettings& CaptureUncertaintyCoeff(double input);
    ScalingSettings& MinCapturedFraction(double input);
    ScalingSettings& MinCCForImage(double min_cc_for_image);
    ScalingSettings& SearchMinZeta(double search_min_zeta);
    ScalingSettings& OutlierRejectNsigma(double input);
    ScalingSettings& ScaleFulls(bool input);
    ScalingSettings& AbsorptionIter(int input);
    ScalingSettings& CorrectionSurfaces(bool input);
    ScalingSettings& StillsPartialityRefine(bool input);
    ScalingSettings& ExpectedVarianceMerge(bool input);
    ScalingSettings& SmoothGDegrees(double input);
    ScalingSettings& RelativeBDegrees(double input);

    ScalingSettings& RfreeFraction(double input);

    ScalingSettings& ResolutionCutoff(ResolutionCutoffMethod input);
    ScalingSettings& ResolutionCCTarget(double input);
    ScalingSettings& ReportShellCount(int input);

    [[nodiscard]] bool GetRefineWedge() const;

    [[nodiscard]] double GetMinMosaicity() const;
    [[nodiscard]] double GetDefaultMosaicity() const;
    [[nodiscard]] double GetMaxMosaicity() const;

    [[nodiscard]] double GetMinWedge() const;
    [[nodiscard]] std::optional<double> GetRotationWedgeForScaling() const;
    [[nodiscard]] double GetMaxWedge() const;

    [[nodiscard]] bool GetMergeFriedel() const;

    [[nodiscard]] std::optional<double> GetHighResolutionLimit_A() const;

    [[nodiscard]] double GetMinPartiality() const;
    [[nodiscard]] std::optional<double> GetForcedMosaicity() const;
    [[nodiscard]] double GetCaptureUncertaintyCoeff() const;
    [[nodiscard]] double GetMinCapturedFraction() const;
    [[nodiscard]] double GetMinCCForImage() const;
    [[nodiscard]] double GetSearchMinZeta() const;
    [[nodiscard]] double GetOutlierRejectNsigma() const;
    [[nodiscard]] bool GetScaleFulls() const;
    [[nodiscard]] int GetAbsorptionIter() const;
    [[nodiscard]] bool GetCorrectionSurfaces() const;
    [[nodiscard]] bool GetStillsPartialityRefine() const;
    [[nodiscard]] bool GetExpectedVarianceMerge() const;
    [[nodiscard]] double GetSmoothGDegrees() const;
    [[nodiscard]] double GetRelativeBDegrees() const;

    [[nodiscard]] double GetRfreeFraction() const;

    [[nodiscard]] ResolutionCutoffMethod GetResolutionCutoff() const;
    [[nodiscard]] double GetResolutionCCTarget() const;
    [[nodiscard]] int GetReportShellCount() const;
};