#ifndef slic3r_CoolingBuffer_hpp_
#define slic3r_CoolingBuffer_hpp_

#include "../libslic3r.h"
#include <map>
#include <string>
#include <cfloat>

namespace Slic3r {

class GCode;
class Layer;
class FirstLayerPlane;
struct PerExtruderAdjustments;

// A standalone G-code filter, to control cooling of the print.
// The G-code is processed per layer. Once a layer is collected, fan start / stop commands are edited
// and the print is modified to stretch over a minimum layer time.
//
// The simple it sounds, the actual implementation is significantly more complex.
// Namely, for a multi-extruder print, each material may require a different cooling logic.
// For example, some materials may not like to print too slowly, while with some materials
// we may slow down significantly.
//
class CoolingBuffer {
public:
    CoolingBuffer(GCode &gcodegen);
    void        reset(const Vec3d &position);
    void        set_current_extruder(unsigned int extruder_id) { m_current_extruder = extruder_id; }
    std::string process_layer(std::string &&gcode, size_t layer_id, bool flush);

private:
	CoolingBuffer& operator=(const CoolingBuffer&) = delete;
    std::vector<PerExtruderAdjustments> parse_layer_gcode(const std::string &gcode, std::vector<float> &current_pos) const;
    float       calculate_layer_slowdown(std::vector<PerExtruderAdjustments> &per_extruder_adjustments);
    // Apply slow down over G-code lines stored in per_extruder_adjustments, enable fan if needed.
    // Returns the adjusted G-code.
    std::string apply_layer_cooldown(const std::string &gcode, size_t layer_id, float layer_time, std::vector<PerExtruderAdjustments> &per_extruder_adjustments);

    // First-layer plane: per-line fan re-evaluation post-pass.  Walks the
    // post-cooldown gcode, tracks XYZ position, and inserts M106 commands at
    // band-crossing transitions in slicing-frame coordinates.  Only runs
    // when m_first_layer_plane is active.
    std::string apply_first_layer_plane_fan_eval(std::string &&gcode_in,
                                                  size_t        layer_id,
                                                  float         layer_time);

    // Pure helper: compute the main fan speed for a given effective layer
    // index (layer-id units, mapped through the plane evaluator) and the
    // current extruder.  Mirrors the inline logic in the change_extruder_set_fan
    // lambda but is callable from per-line code.
    int compute_main_fan_speed(int effective_layer_id, float layer_time,
                               unsigned int extruder_id) const;

    // G-code snippet cached for the support layers preceding an object layer.
    std::string                 m_gcode;
    // Internal data.
    // BBS: X,Y,Z,E,F,I,J
    std::vector<char>           m_axis;
    std::vector<float>          m_current_pos;
    // Current known fan speed or -1 if not known yet.
    int                         m_fan_speed;
    int                         m_additional_fan_speed;
    // Cached from GCodeWriter.
    // Printing extruder IDs, zero based.
    std::vector<unsigned int>   m_extruder_ids;
    // Highest of m_extruder_ids plus 1.
    unsigned int                m_num_extruders { 0 };
    const std::string           m_toolchange_prefix;
    // Referencs GCode::m_config, which is FullPrintConfig. While the PrintObjectConfig slice of FullPrintConfig is being modified,
    // the PrintConfig slice of FullPrintConfig is constant, thus no thread synchronization is required.
    const PrintConfig          &m_config;
    unsigned int                m_current_extruder;
    //BBS: current fan speed
    int                         m_current_fan_speed;
    // First-layer plane evaluator, borrowed from GCode.  Null = inactive
    // (legacy per-layer fan control).
    const FirstLayerPlane      *m_first_layer_plane = nullptr;
};

}

#endif