#pragma once
/**
 * @file pmi_mbd.h
 * @brief Product Manufacturing Information (PMI) and Model-Based Definition (MBD)
 *
 * Attaches semantic PMI annotations (dimensions, tolerances, GD&T, surface finish,
 * notes) directly to 3D B-Rep models. Supports STEP AP242 export with embedded PMI.
 *
 * PMI annotations are the digital equivalent of 2D drawing annotations placed
 * directly on the 3D model, enabling paperless manufacturing workflows.
 *
 * @ingroup brep
 */
#include "vde/brep/brep.h"
#include "vde/brep/gdt.h"
#include "vde/brep/auto_dimensioning.h"
#include "vde/core/point.h"
#include <vector>
#include <string>
#include <memory>
#include <map>
#include <set>

namespace vde::brep {

// ═══════════════════════════════════════════════════════════
//  PMI Annotation Types
// ═══════════════════════════════════════════════════════════

/// PMI annotation category
enum class PMIType {
    Dimension,          ///< Linear/angular/radial dimension
    GDTCalloutType,     ///< Geometric dimensioning & tolerancing
    DatumTarget,        ///< Datum target symbol
    SurfaceFinish,      ///< Surface finish / roughness
    Note,               ///< General note / text
    WeldSymbol,         ///< Welding symbol
    DatumFeature,       ///< Datum feature identifier
    Balloon,            ///< Balloon callout (for BOM)
    Custom,             ///< Custom annotation
};

/// PMI annotation display properties
struct PMIDisplayProps {
    bool visible = true;               ///< Visibility toggle
    std::string color = "#000000";     ///< Text/line color (hex)
    double text_height = 3.5;          ///< Text height in mm
    double line_width = 0.35;          ///< Line width in mm
    std::string font = "ISOCP";        ///< Font name (ISO standard)
    bool show_leader = true;           ///< Show leader line
    bool show_frame = false;           ///< Show bounding frame
    int layer = 0;                     ///< Display layer for organization
};

/// PMI annotation — semantic 3D annotation attached to model geometry
struct PMIAnnotation {
    int id = -1;                          ///< Unique annotation ID
    PMIType type = PMIType::Note;         ///< Annotation category
    std::string label;                    ///< Display label / identifier

    /// Associated geometry elements (face IDs, edge IDs, vertex IDs)
    std::vector<int> associated_faces;
    std::vector<int> associated_edges;
    std::vector<int> associated_vertices;

    /// 3D position of the annotation text
    core::Point3D text_position;

    /// Leader attachment point on the model surface
    core::Point3D attachment_point;

    /// Plane normal for annotation orientation (text plane normal)
    core::Vector3D annotation_normal;

    /// Text content
    std::string content;                  ///< Main annotation text
    std::string sub_content;              ///< Secondary line text
    std::string prefix;                   ///< Text prefix (Ø, R, etc.)
    std::string suffix;                   ///< Text suffix

    /// For dimension-type PMI
    double nominal_value = 0.0;
    double tolerance_upper = 0.0;
    double tolerance_lower = 0.0;

    /// For GD&T-type PMI
    GDTType gdt_type = GDTType::Flatness;
    std::vector<DatumReference> datum_refs;

    /// Display properties
    PMIDisplayProps display;

    /// Custom metadata key-value pairs
    std::map<std::string, std::string> metadata;

    /// Get annotation type name string
    [[nodiscard]] std::string type_name() const;

    /// Generate STEP AP242 representation string for this annotation
    [[nodiscard]] std::string to_step_ap242(int& next_id) const;
};

// ═══════════════════════════════════════════════════════════
//  PMI View Management
// ═══════════════════════════════════════════════════════════

/// PMI view — a named view with specific annotation visibility
class PMIView {
public:
    PMIView() = default;
    explicit PMIView(const std::string& name) : name_(name) {}

    /// Set view name
    void set_name(const std::string& name) { name_ = name; }
    [[nodiscard]] const std::string& name() const { return name_; }

    /// Set view direction
    void set_direction(const core::Vector3D& dir) { direction_ = dir; }
    [[nodiscard]] const core::Vector3D& direction() const { return direction_; }

    /// Add a visible annotation to this view
    void add_annotation(int annotation_id);

    /// Remove an annotation from this view
    void remove_annotation(int annotation_id);

    /// Check if an annotation is visible in this view
    [[nodiscard]] bool is_visible(int annotation_id) const;

    /// Get all visible annotation IDs
    [[nodiscard]] const std::set<int>& visible_annotations() const { return visible_ids_; }

    /// Set all annotations visible (except hidden)
    void set_all_visible(const std::vector<int>& all_ids);

    /// Set all annotations hidden
    void clear_all();

    /// Hide specific annotations
    void hide_annotations(const std::vector<int>& ids);

    /// Add a note to this view
    void set_note(const std::string& note) { note_ = note; }
    [[nodiscard]] const std::string& note() const { return note_; }

    /// View scale
    void set_scale(double s) { scale_ = s; }
    [[nodiscard]] double scale() const { return scale_; }

private:
    std::string name_;
    core::Vector3D direction_{0, 0, -1};   ///< Default: front view
    std::set<int> visible_ids_;
    std::string note_;
    double scale_ = 1.0;
};

// ═══════════════════════════════════════════════════════════
//  PMI Model — container for all PMI on a model
// ═══════════════════════════════════════════════════════════

/// PMI model — collection of all PMI annotations and views for a B-Rep model
class PMIModel {
public:
    PMIModel() = default;

    // ── Annotation management ──

    /// Attach a PMI annotation to the model
    /// @return The assigned annotation ID
    int attach_pmi(const PMIAnnotation& annotation);

    /// Attach PMI and return reference
    int attach_pmi(PMIAnnotation&& annotation);

    /// Remove an annotation by ID
    /// @return true if found and removed
    bool remove_pmi(int annotation_id);

    /// Get annotation by ID
    [[nodiscard]] const PMIAnnotation* get_annotation(int id) const;

    /// Get all annotations
    [[nodiscard]] const std::vector<PMIAnnotation>& annotations() const { return annotations_; }

    /// Get annotations associated with a specific face
    [[nodiscard]] std::vector<const PMIAnnotation*> annotations_for_face(int face_id) const;

    /// Get annotations associated with a specific edge
    [[nodiscard]] std::vector<const PMIAnnotation*> annotations_for_edge(int edge_id) const;

    /// Get annotations of a specific type
    [[nodiscard]] std::vector<const PMIAnnotation*> annotations_of_type(PMIType type) const;

    /// Total annotation count
    [[nodiscard]] size_t count() const { return annotations_.size(); }

    // ── View management ──

    /// Add or update a PMI view
    void set_view(const std::string& name, const PMIView& view);
    void set_view(const std::string& name, PMIView&& view);

    /// Get a view by name
    [[nodiscard]] const PMIView* get_view(const std::string& name) const;

    /// Get all views
    [[nodiscard]] const std::map<std::string, PMIView>& views() const { return views_; }

    /// Remove a view
    void remove_view(const std::string& name);

    /// Create default views (front, top, right, iso)
    void create_default_views();

    // ── STEP AP242 export ──

    /// Export PMI as STEP AP242 embedded annotations
    [[nodiscard]] std::string to_step_ap242() const;

    /// Total size of STEP AP242 output (approximate)
    [[nodiscard]] size_t step_ap242_byte_count() const;

private:
    std::vector<PMIAnnotation> annotations_;
    std::map<std::string, PMIView> views_;
    int next_annotation_id_ = 1;
};

// ═══════════════════════════════════════════════════════════
//  Top-level API
// ═══════════════════════════════════════════════════════════

/**
 * @brief Attach PMI annotations to a B-Rep model
 *
 * Convenience function: adds annotation to a PMIModel associated with the body.
 *
 * @param body B-Rep model
 * @param annotation PMI annotation to attach
 * @param pmi_model PMI model container (modified in-place)
 * @return Assigned annotation ID
 */
int attach_pmi(BrepModel& body, const PMIAnnotation& annotation,
               PMIModel& pmi_model);

/**
 * @brief Export B-Rep model with PMI as STEP AP242
 *
 * Produces a STEP AP242 file containing both geometry and embedded PMI.
 *
 * @param body B-Rep model
 * @param pmi_model PMI annotations and views
 * @return STEP AP242 string with PMI
 */
[[nodiscard]] std::string export_pmi_step_ap242(
    const BrepModel& body, const PMIModel& pmi_model);

/**
 * @brief Export to STEP AP242 file
 *
 * @param filepath Output file path (.stp, .step, .p21)
 * @param body B-Rep model
 * @param pmi_model PMI annotations and views
 */
void export_pmi_step_ap242_file(const std::string& filepath,
    const BrepModel& body, const PMIModel& pmi_model);

/**
 * @brief Auto-generate PMI annotations from B-Rep model
 *
 * Creates dimension PMI, GD&T PMI, and surface finish annotations.
 *
 * @param body B-Rep model
 * @param pmi_model PMI model to populate (modified in-place)
 * @param standard Drawing standard for format
 * @return Number of annotations generated
 */
int auto_generate_pmi(const BrepModel& body, PMIModel& pmi_model,
                      DrawingStandard standard = DrawingStandard::ISO);

/**
 * @brief Create a PMI dimension annotation
 *
 * @param type PMI type
 * @param value Dimension value
 * @param position 3D text position
 * @param face_ids Associated face IDs
 * @return PMIAnnotation ready to attach
 */
[[nodiscard]] PMIAnnotation make_pmi_dimension(
    PMIType type, double value,
    const core::Point3D& position,
    const std::vector<int>& face_ids);

/**
 * @brief Create a PMI GD&T annotation from a GDTCallout
 *
 * @param callout GD&T callout
 * @param position 3D text position
 * @return PMIAnnotation ready to attach
 */
[[nodiscard]] PMIAnnotation make_pmi_gdt(
    const GDTCallout& callout,
    const core::Point3D& position);

/**
 * @brief Create a PMI surface finish annotation
 *
 * @param roughness_ra Ra value in μm
 * @param face_id Associated face ID
 * @param position 3D text position
 * @return PMIAnnotation ready to attach
 */
[[nodiscard]] PMIAnnotation make_pmi_surface_finish(
    double roughness_ra, int face_id,
    const core::Point3D& position);

/**
 * @brief Create a PMI datum target annotation
 *
 * @param label Datum label (A, B, C...)
 * @param face_id Associated face ID
 * @param position 3D position
 * @return PMIAnnotation ready to attach
 */
[[nodiscard]] PMIAnnotation make_pmi_datum_target(
    const std::string& label, int face_id,
    const core::Point3D& position);

}  // namespace vde::brep