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

#pragma once

#include <atomic>
#include <optional>
#include <string>
#include <vector>

#include "../common/DiffractionExperiment.h"
#include "../common/PixelMask.h"
#include "../common/CrystalLattice.h"
#include "../common/Reflection.h"            // MergedReflection
#include "../common/JFJochMessages.h"        // DataMessage
#include "../common/JFJochReceiverPlots.h"   // MeanProcessingTime
#include "../image_analysis/spot_finding/SpotFindingSettings.h"

class JFJochHDF5Reader;

// Offline reprocessing of a stored Jungfraujoch HDF5 dataset, shared by jfjoch_process,
// jfjoch_azint and (later) the viewer. The full processing workflow lives here, not in the CLIs:
// setup, an optional two-pass rotation-indexing pre-pass, a parallel per-image loop (std::thread),
// an optional scaling/merging post-pass, and the _process.h5 output. The detector geometry and all
// algorithm settings are configured on the DiffractionExperiment by the caller; ProcessConfig only
// carries run control. Cancellable from any thread (e.g. SIGINT or a GUI button) via Cancel().
enum class ProcessMode {
    AzimuthalIntegration,   // preprocess + azimuthal integration only (jfjoch_azint)
    FullAnalysis            // spot finding + indexing + refinement + integration (jfjoch_process)
};

struct ProcessConfig {
    ProcessMode mode = ProcessMode::FullAnalysis;

    int start_image = 0;
    int end_image = -1;     // -1 => to the end of the dataset
    int stride = 1;
    int nthreads = 1;

    // Output prefix for the _process.h5 (and scaled reflections). Empty => process without writing.
    std::string output_prefix;

    SpotFindingSettings spot_finding;   // FullAnalysis spot finding

    // Rotation indexing (FullAnalysis)
    bool rotation_indexing = false;
    bool two_pass_rotation = true;
    bool reuse_rotation_spots = true;
    int rotation_indexing_image_count = 30;
    std::optional<CrystalLattice> forced_rotation_lattice;

    // Scaling / merging (FullAnalysis). reference_data (from a reference MTZ) also drives the
    // per-image live scaling path when present.
    bool run_scaling = false;
    int64_t scaling_iter = 3;
    std::vector<MergedReflection> reference_data;
};

struct ProcessResult {
    bool cancelled = false;
    uint64_t images_processed = 0;
    double processing_time_s = 0.0;
    double frame_rate_hz = 0.0;
    double throughput_MBs = 0.0;
    std::optional<float> indexing_rate;
    std::optional<UnitCell> consensus_cell;
    bool rotation_lattice_found = false;
    MeanProcessingTime mean_processing_time{};
    std::optional<std::string> written_master_path;
    std::string merge_statistics_text;   // populated when scaling/merging ran
};

// Callbacks for progress and live results. Methods may be called from worker threads, so an
// implementation must be thread-safe. The default no-ops suit the CLIs.
class JFJochProcessObserver {
public:
    virtual ~JFJochProcessObserver() = default;
    virtual void OnPhase(const std::string &phase) {}
    virtual void OnProgress(uint64_t done, uint64_t total) {}
    virtual void OnImageProcessed(const DataMessage &msg) {}
};

class JFJochProcess {
    JFJochHDF5Reader &reader_;
    DiffractionExperiment experiment_;
    PixelMask pixel_mask_;
    ProcessConfig config_;
    std::atomic<bool> cancelled_{false};

public:
    JFJochProcess(JFJochHDF5Reader &reader, DiffractionExperiment experiment,
                  PixelMask pixel_mask, ProcessConfig config);

    // Runs the configured workflow to completion or until Cancel(). Throws on setup failure.
    ProcessResult Run(JFJochProcessObserver *observer = nullptr);

    // Request cancellation; safe to call from any thread (the worker loop checks between images).
    void Cancel() { cancelled_ = true; }
    bool IsCancelled() const { return cancelled_; }
};