#ifndef slic3r_TriangleMesh_hpp_
#define slic3r_TriangleMesh_hpp_

#include "libslic3r.h"
#include <admesh/stl.h>
#include <functional>
#include <vector>
#include <boost/thread.hpp>
#include "BoundingBox.hpp"
#include "Line.hpp"
#include "Point.hpp"
#include "Polygon.hpp"
#include "ExPolygon.hpp"

namespace Slic3r {

class TriangleMesh;
class TriangleMeshSlicer;
typedef std::vector<TriangleMesh*> TriangleMeshPtrs;

class TriangleMesh
{
public:
    TriangleMesh() : repaired(false) { stl_initialize(&this->stl); }
    TriangleMesh(const Pointf3s &points, const std::vector<Vec3crd> &facets);
    TriangleMesh(const TriangleMesh &other) : repaired(false) { stl_initialize(&this->stl); *this = other; }
    TriangleMesh(TriangleMesh &&other) : repaired(false) { stl_initialize(&this->stl); this->swap(other); }
    ~TriangleMesh() { stl_close(&this->stl); }
    TriangleMesh& operator=(const TriangleMesh &other);
    TriangleMesh& operator=(TriangleMesh &&other) { this->swap(other); return *this; }
    void swap(TriangleMesh &other) { std::swap(this->stl, other.stl); std::swap(this->repaired, other.repaired); }
    void ReadSTLFile(const char* input_file) { stl_open(&stl, input_file); }
    void write_ascii(const char* output_file) { stl_write_ascii(&this->stl, output_file, ""); }
    void write_binary(const char* output_file) { stl_write_binary(&this->stl, output_file, ""); }
    void repair();
    float volume();
    void check_topology();
    bool is_manifold() const { return this->stl.stats.connected_facets_3_edge == (int)this->stl.stats.number_of_facets; }
    void WriteOBJFile(const char* output_file);
    void scale(float factor);
    void scale(const Vec3d &versor);
    void translate(float x, float y, float z);
    void rotate(float angle, const Axis &axis);
    void rotate(float angle, const Vec3d& axis);
    void rotate_x(float angle) { this->rotate(angle, X); }
    void rotate_y(float angle) { this->rotate(angle, Y); }
    void rotate_z(float angle) { this->rotate(angle, Z); }
    void mirror(const Axis &axis);
    void mirror_x() { this->mirror(X); }
    void mirror_y() { this->mirror(Y); }
    void mirror_z() { this->mirror(Z); }
    void transform(const Transform3d& t);
    void align_to_origin();
    void rotate(double angle, Point* center);
    TriangleMeshPtrs split() const;
    void merge(const TriangleMesh &mesh);
    ExPolygons horizontal_projection() const;
    const float* first_vertex() const { return this->stl.facet_start ? &this->stl.facet_start->vertex[0](0) : nullptr; }
    // 2D convex hull of a 3D mesh projected into the Z=0 plane.
    Polygon convex_hull();
    BoundingBoxf3 bounding_box() const;
    // Returns the bbox of this TriangleMesh transformed by the given transformation
    BoundingBoxf3 transformed_bounding_box(const Transform3d &trafo) const;
    // Returns the convex hull of this TriangleMesh
    TriangleMesh convex_hull_3d() const;
    void reset_repair_stats();
    bool needed_repair() const;
    size_t facets_count() const { return this->stl.stats.number_of_facets; }
    bool   empty() const { return this->facets_count() == 0; }

    bool is_splittable() const;

    stl_file stl;
    bool repaired;
    
private:
    void require_shared_vertices();
    std::deque<uint32_t> find_unvisited_neighbors(std::vector<unsigned char> &facet_visited) const;
    friend class TriangleMeshSlicer;
};

enum FacetEdgeType { 
    // A general case, the cutting plane intersect a face at two different edges.
    feGeneral,
    // Two vertices are aligned with the cutting plane, the third vertex is below the cutting plane.
    feTop,
    // Two vertices are aligned with the cutting plane, the third vertex is above the cutting plane.
    feBottom,
    // All three vertices of a face are aligned with the cutting plane.
    feHorizontal
};

class IntersectionReference
{
public:
    IntersectionReference() : point_id(-1), edge_id(-1) {};
    IntersectionReference(int point_id, int edge_id) : point_id(point_id), edge_id(edge_id) {}
    // Where is this intersection point located? On mesh vertex or mesh edge?
    // Only one of the following will be set, the other will remain set to -1.
    // Index of the mesh vertex.
    int point_id;
    // Index of the mesh edge.
    int edge_id;
};

class IntersectionPoint : public Point, public IntersectionReference
{
public:
    IntersectionPoint() {};
    IntersectionPoint(int point_id, int edge_id, const Point &pt) : IntersectionReference(point_id, edge_id), Point(pt) {}
    IntersectionPoint(const IntersectionReference &ir, const Point &pt) : IntersectionReference(ir), Point(pt) {}
    // Inherits coord_t x, y
};

class IntersectionLine : public Line
{
public:
    IntersectionLine() : a_id(-1), b_id(-1), edge_a_id(-1), edge_b_id(-1), edge_type(feGeneral), flags(0) {}

    bool skip() const { return (this->flags & SKIP) != 0; }
    void set_skip() { this->flags |= SKIP; }

    bool is_seed_candidate() const { return (this->flags & NO_SEED) == 0 && ! this->skip(); }
    void set_no_seed(bool set) { if (set) this->flags |= NO_SEED; else this->flags &= ~NO_SEED; }
    
    // Inherits Point a, b
    // For each line end point, either {a,b}_id or {a,b}edge_a_id is set, the other is left to -1.
    // Vertex indices of the line end points.
    int             a_id;
    int             b_id;
    // Source mesh edges of the line end points.
    int             edge_a_id;
    int             edge_b_id;
    // feGeneral, feTop, feBottom, feHorizontal
    FacetEdgeType   edge_type;
    // Used by TriangleMeshSlicer::slice() to skip duplicate edges.
    enum {
        // Triangle edge added, because it has no neighbor.
        EDGE0_NO_NEIGHBOR   = 0x001,
        EDGE1_NO_NEIGHBOR   = 0x002,
        EDGE2_NO_NEIGHBOR   = 0x004,
        // Triangle edge added, because it makes a fold with another horizontal edge.
        EDGE0_FOLD          = 0x010,
        EDGE1_FOLD          = 0x020,
        EDGE2_FOLD          = 0x040,
        // The edge cannot be a seed of a greedy loop extraction (folds are not safe to become seeds).
        NO_SEED             = 0x100,
        SKIP                = 0x200,
    };
    uint32_t        flags;
};
typedef std::vector<IntersectionLine> IntersectionLines;
typedef std::vector<IntersectionLine*> IntersectionLinePtrs;

class TriangleMeshSlicer
{
public:
    typedef std::function<void()> throw_on_cancel_callback_type;
    TriangleMeshSlicer() : mesh(nullptr) {}
    // Not quite nice, but the constructor and init() methods require non-const mesh pointer to be able to call mesh->require_shared_vertices()
	TriangleMeshSlicer(TriangleMesh* mesh) { this->init(mesh, [](){}); }
    void init(TriangleMesh *mesh, throw_on_cancel_callback_type throw_on_cancel);
    void slice(const std::vector<float> &z, std::vector<Polygons>* layers, throw_on_cancel_callback_type throw_on_cancel) const;
    void slice(const std::vector<float> &z, const float closing_radius, std::vector<ExPolygons>* layers, throw_on_cancel_callback_type throw_on_cancel) const;
    enum FacetSliceType {
        NoSlice = 0,
        Slicing = 1,
        Cutting = 2
    };
    FacetSliceType slice_facet(float slice_z, const stl_facet &facet, const int facet_idx,
        const float min_z, const float max_z, IntersectionLine *line_out) const;
    void cut(float z, TriangleMesh* upper, TriangleMesh* lower) const;
    
private:
    const TriangleMesh      *mesh;
    // Map from a facet to an edge index.
    std::vector<int>         facets_edges;
    // Scaled copy of this->mesh->stl.v_shared
    std::vector<stl_vertex>  v_scaled_shared;

    void _slice_do(size_t facet_idx, std::vector<IntersectionLines>* lines, boost::mutex* lines_mutex, const std::vector<float> &z) const;
    void make_loops(std::vector<IntersectionLine> &lines, Polygons* loops) const;
    void make_expolygons(const Polygons &loops, const float closing_radius, ExPolygons* slices) const;
    void make_expolygons_simple(std::vector<IntersectionLine> &lines, ExPolygons* slices) const;
    void make_expolygons(std::vector<IntersectionLine> &lines, const float closing_radius, ExPolygons* slices) const;
};

TriangleMesh make_cube(double x, double y, double z);

// Generate a TriangleMesh of a cylinder
TriangleMesh make_cylinder(double r, double h, double fa=(2*PI/360));

TriangleMesh make_sphere(double rho, double fa=(2*PI/360));

}

#endif