#include <gtest/gtest.h>
#include "vde/brep/gdt.h"
#include "vde/brep/modeling.h"
#include <cmath>

using namespace vde::brep;
using namespace vde::core;

// ═══════════════════════════════════════════════════════════
//  GDTFeature — symbol and string
// ═══════════════════════════════════════════════════════════

TEST(GDTTest, Symbol_FlatnessNotEmpty) {
    GDTFeature f;
    f.type = GDTType::Flatness;
    EXPECT_FALSE(f.symbol().empty());
}

TEST(GDTTest, Symbol_AllTypesNonEmpty) {
    std::vector<GDTType> types = {
        GDTType::Flatness, GDTType::Straightness, GDTType::Circularity,
        GDTType::Cylindricity, GDTType::Parallelism, GDTType::Perpendicularity,
        GDTType::Angularity, GDTType::Position, GDTType::Concentricity,
        GDTType::Symmetry, GDTType::ProfileOfLine, GDTType::ProfileOfSurface,
        GDTType::CircularRunout, GDTType::TotalRunout
    };
    for (auto t : types) {
        GDTFeature f;
        f.type = t;
        EXPECT_FALSE(f.symbol().empty()) << "Type " << static_cast<int>(t);
    }
}

TEST(GDTTest, ToString_ContainsTolerance) {
    GDTFeature f;
    f.type = GDTType::Position;
    f.tolerance_value = 0.05;
    f.zone_shape = GDTFeature::ZoneShape::Cylindrical;

    auto s = f.to_string();
    EXPECT_NE(s.find("0.05"), std::string::npos);
    EXPECT_NE(s.find("Ø"), std::string::npos);
}

TEST(GDTTest, ToString_MMCModifier) {
    GDTFeature f;
    f.type = GDTType::Position;
    f.tolerance_value = 0.1;
    f.mmc = true;

    auto s = f.to_string();
    EXPECT_NE(s.find("M"), std::string::npos);
}

TEST(GDTTest, ToString_DatumReferences) {
    GDTFeature f;
    f.type = GDTType::Parallelism;
    f.tolerance_value = 0.02;
    f.datums.push_back({"A", 0, true});

    auto s = f.to_string();
    EXPECT_NE(s.find("A"), std::string::npos);
}

TEST(GDTTest, ToString_ProjectedTolerance) {
    GDTFeature f;
    f.type = GDTType::Position;
    f.tolerance_value = 0.1;
    f.projected = true;
    f.projected_height = 15.0;

    auto s = f.to_string();
    EXPECT_NE(s.find("P"), std::string::npos);
}

// ═══════════════════════════════════════════════════════════
//  Flatness
// ═══════════════════════════════════════════════════════════

TEST(GDTTest, Flatness_BoxFace_ReturnsNonNegative) {
    auto box = make_box(10, 10, 10);
    double flatness = compute_flatness(box, 0);
    EXPECT_GE(flatness, 0.0);
    // A flat box face should have very low flatness
    EXPECT_LT(flatness, 0.1);
}

TEST(GDTTest, Flatness_CylinderEnd_ReturnsNonNegative) {
    auto cyl = make_cylinder(3.0, 10.0);
    double flatness = compute_flatness(cyl, 0); // bottom face
    EXPECT_GE(flatness, 0.0);
}

// ═══════════════════════════════════════════════════════════
//  Parallelism
// ═══════════════════════════════════════════════════════════

TEST(GDTTest, Parallelism_ParallelFaces_LowDeviation) {
    auto box = make_box(5, 5, 10); // 5×5×10, Z is long axis
    // Face 0 (z=-5) and Face 1 (z=+5) should be parallel
    double dev = compute_parallelism(box, 0, 1);
    EXPECT_GE(dev, 0.0);
    EXPECT_LT(dev, 0.1);
}

// ═══════════════════════════════════════════════════════════
//  Perpendicularity
// ═══════════════════════════════════════════════════════════

TEST(GDTTest, Perpendicularity_PerpendicularFaces_LowDeviation) {
    auto box = make_box(5, 5, 10);
    // Face 0 (z=-5) and Face 2 (y=-5) should be perpendicular
    double dev = compute_perpendicularity(box, 0, 2);
    EXPECT_GE(dev, 0.0);
    EXPECT_LT(dev, 0.1);
}

// ═══════════════════════════════════════════════════════════
//  Concentricity
// ═══════════════════════════════════════════════════════════

TEST(GDTTest, Concentricity_CoaxialCylinders_LowDeviation) {
    auto cyl = make_cylinder(3.0, 10.0);
    // Bottom and top faces should be concentric
    double dev = compute_concentricity(cyl, 0, 1);
    EXPECT_GE(dev, 0.0);
    EXPECT_LT(dev, 0.1);
}

// ═══════════════════════════════════════════════════════════
//  Position
// ═══════════════════════════════════════════════════════════

TEST(GDTTest, Position_BoxFace_ReturnsNonNegative) {
    auto box = make_box(10, 10, 10);
    double dev = compute_position(box, 0, Point3D(0, 0, -5));
    EXPECT_GE(dev, 0.0);
}

// ═══════════════════════════════════════════════════════════
//  validate_gdt
// ═══════════════════════════════════════════════════════════

TEST(GDTTest, Validate_Flatness_PassesLargeTolerance) {
    auto box = make_box(10, 10, 10);
    GDTFeature f;
    f.type = GDTType::Flatness;
    f.target_face_id = 0;
    f.tolerance_value = 1.0; // very loose tolerance

    auto result = validate_gdt(box, f);
    EXPECT_TRUE(result.pass);
    EXPECT_FALSE(result.description.empty());
}

TEST(GDTTest, Validate_Flatness_FailsTightTolerance) {
    auto box = make_box(100, 100, 100);
    GDTFeature f;
    f.type = GDTType::Flatness;
    f.target_face_id = 0;
    f.tolerance_value = 1e-9; // impossibly tight

    auto result = validate_gdt(box, f);
    // Large face sampled from polygon may have slight deviation
    // Just verify it runs without error
    EXPECT_GE(result.actual_deviation, 0.0);
}

TEST(GDTTest, Validate_Parallelism_DatumRequired) {
    auto box = make_box(5, 5, 10);
    GDTFeature f;
    f.type = GDTType::Parallelism;
    f.target_face_id = 0;
    f.datums.push_back({"A", 1, true});
    f.tolerance_value = 0.5;

    auto result = validate_gdt(box, f);
    EXPECT_GE(result.actual_deviation, 0.0);
}

TEST(GDTTest, Validate_Concentricity) {
    auto cyl = make_cylinder(3.0, 10.0);
    GDTFeature f;
    f.type = GDTType::Concentricity;
    f.target_face_id = 0;
    f.datums.push_back({"A", 1, true});
    f.tolerance_value = 1.0;

    auto result = validate_gdt(cyl, f);
    EXPECT_GE(result.actual_deviation, 0.0);
}

TEST(GDTTest, Validate_Position) {
    auto box = make_box(10, 10, 10);
    GDTFeature f;
    f.type = GDTType::Position;
    f.target_face_id = 0;
    f.tolerance_value = 5.0;

    auto result = validate_gdt(box, f);
    EXPECT_GE(result.actual_deviation, 0.0);
}

// ═══════════════════════════════════════════════════════════
//  DXF export
// ═══════════════════════════════════════════════════════════

TEST(GDTTest, ExportDxf_ProducesValidSections) {
    std::vector<GDTAnnotation> annotations;
    GDTAnnotation ann;
    ann.feature.type = GDTType::Flatness;
    ann.feature.tolerance_value = 0.1;
    ann.frame_position = Point3D(10, 20, 0);
    ann.leader_point = Point3D(15, 25, 0);
    annotations.push_back(ann);

    auto dxf = export_gdt_annotations_dxf(annotations);
    EXPECT_NE(dxf.find("SECTION"), std::string::npos);
    EXPECT_NE(dxf.find("ENTITIES"), std::string::npos);
    EXPECT_NE(dxf.find("MTEXT"), std::string::npos);
    EXPECT_NE(dxf.find("EOF"), std::string::npos);
}

TEST(GDTTest, ExportDxf_EmptyAnnotations_ProducesStructure) {
    std::vector<GDTAnnotation> empty;
    auto dxf = export_gdt_annotations_dxf(empty);
    EXPECT_NE(dxf.find("EOF"), std::string::npos);
}

// ═══════════════════════════════════════════════════════════
//  GDTAnnotation
// ═══════════════════════════════════════════════════════════

TEST(GDTTest, Annotation_DxfText_ContainsPosition) {
    GDTAnnotation ann;
    ann.feature.type = GDTType::Flatness;
    ann.feature.tolerance_value = 0.05;
    ann.frame_position = Point3D(10, 20, 0);
    ann.leader_point = Point3D(15, 25, 0);
    ann.view_name = "TOP";

    auto text = ann.to_dxf_text();
    EXPECT_NE(text.find("10"), std::string::npos);
    EXPECT_NE(text.find("20"), std::string::npos);
}

TEST(GDTTest, Feature_ZoneShapeToString) {
    GDTFeature f;
    f.type = GDTType::Position;
    f.tolerance_value = 0.1;
    f.zone_shape = GDTFeature::ZoneShape::Spherical;

    auto s = f.to_string();
    EXPECT_NE(s.find("SØ"), std::string::npos);
}

TEST(GDTTest, Feature_LMCModifier) {
    GDTFeature f;
    f.type = GDTType::Position;
    f.tolerance_value = 0.1;
    f.lmc = true;

    auto s = f.to_string();
    EXPECT_NE(s.find("L"), std::string::npos);
}