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

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

// ═══════════════════════════════════════════════════════════
//  StandardConfig / DrawingStandard
// ═══════════════════════════════════════════════════════════

TEST(AutoDimTest, StandardConfig_ISODefaults) {
    auto cfg = standard_defaults(DrawingStandard::ISO);
    EXPECT_EQ(cfg.standard, DrawingStandard::ISO);
    EXPECT_GT(cfg.text_height, 0.0);
    EXPECT_GT(cfg.arrow_size, 0.0);
    EXPECT_EQ(cfg.standard_name(), "ISO 129");
}

TEST(AutoDimTest, StandardConfig_ANSIDefaults) {
    auto cfg = standard_defaults(DrawingStandard::ANSI);
    EXPECT_EQ(cfg.standard, DrawingStandard::ANSI);
    EXPECT_GT(cfg.text_height, 0.0);
    EXPECT_EQ(cfg.standard_name(), "ANSI Y14.5");
}

TEST(AutoDimTest, StandardConfig_JISDefaults) {
    auto cfg = standard_defaults(DrawingStandard::JIS);
    EXPECT_EQ(cfg.standard, DrawingStandard::JIS);
    EXPECT_GT(cfg.text_height, 0.0);
    EXPECT_EQ(cfg.standard_name(), "JIS B 0001");
}

// ═══════════════════════════════════════════════════════════
//  apply_standard
// ═══════════════════════════════════════════════════════════

TEST(AutoDimTest, ApplyStandard_ChangesConfig) {
    DrawingSettings ds;
    ds.config = standard_defaults(DrawingStandard::JIS);
    EXPECT_EQ(ds.config.standard, DrawingStandard::JIS);

    apply_standard(ds, DrawingStandard::ISO);
    EXPECT_EQ(ds.config.standard, DrawingStandard::ISO);
    EXPECT_EQ(ds.config.standard_name(), "ISO 129");
}

TEST(AutoDimTest, ApplyStandardWithOverrides_PreservesOverrides) {
    DrawingSettings ds;
    StandardConfig overrides;
    overrides.text_height = 5.0;

    apply_standard_with_overrides(ds, DrawingStandard::ISO, overrides);
    EXPECT_EQ(ds.config.standard, DrawingStandard::ISO);
    EXPECT_DOUBLE_EQ(ds.config.text_height, 5.0);
}

// ═══════════════════════════════════════════════════════════
//  auto_dimension — box
// ═══════════════════════════════════════════════════════════

TEST(AutoDimTest, AutoDimension_Box_ReturnsDimensions) {
    auto box = make_box(10, 5, 3);
    auto dims = auto_dimension(box, Vector3D(0, 0, -1));
    EXPECT_GE(dims.size(), 1u) << "Should detect at least one dimension";
}

TEST(AutoDimTest, AutoDimension_Box_HasLinearDimensions) {
    auto box = make_box(10, 5, 3);
    auto dims = auto_dimension(box, Vector3D(0, 0, -1));

    bool has_linear = false;
    for (const auto& d : dims) {
        if (d.type == DimensionType::Linear) {
            has_linear = true;
            EXPECT_GT(d.value, 0.0);
            break;
        }
    }
    EXPECT_TRUE(has_linear) << "Box should produce linear dimensions";
}

TEST(AutoDimTest, AutoDimension_SmallValueDimensions_Filtered) {
    auto box = make_box(0.0001, 0.0001, 0.0001);
    auto dims = auto_dimension(box, Vector3D(0, 0, -1));
    // Very small box — dimensions should be filtered (below threshold)
    // At minimum, it should not crash
    SUCCEED();
}

// ═══════════════════════════════════════════════════════════
//  auto_dimension — cylinder
// ═══════════════════════════════════════════════════════════

TEST(AutoDimTest, AutoDimension_Cylinder_ReturnsDimensions) {
    auto cyl = make_cylinder(3.0, 10.0, 16);
    auto dims = auto_dimension(cyl, Vector3D(0, 0, -1));
    EXPECT_GE(dims.size(), 1u) << "Cylinder should produce dimensions";
}

TEST(AutoDimTest, AutoDimension_Cylinder_HasRadialDimension) {
    auto cyl = make_cylinder(3.0, 10.0, 32);
    auto dims = auto_dimension(cyl, Vector3D(0, 0, -1));

    // Polygonal cylinder edges are straight line segments, not NURBS arcs.
    // Arc detection requires NURBS curve degree == 2 on edges.
    // The cylinder should still produce linear dimensions.
    bool has_linear_or_radial = false;
    for (const auto& d : dims) {
        if (d.type == DimensionType::Radius || d.type == DimensionType::Diameter ||
            d.type == DimensionType::Linear) {
            has_linear_or_radial = true;
            break;
        }
    }
    EXPECT_TRUE(has_linear_or_radial) << "Cylinder should produce dimensions";
}

// ═══════════════════════════════════════════════════════════
//  auto_dimension — edge cases
// ═══════════════════════════════════════════════════════════

TEST(AutoDimTest, AutoDimension_EmptyModel_ReturnsEmpty) {
    BrepModel empty;
    auto dims = auto_dimension(empty, Vector3D(0, 0, -1));
    EXPECT_TRUE(dims.empty());
}

TEST(AutoDimTest, AutoDimension_DifferentViewDirections) {
    auto box = make_box(10, 5, 3);
    auto dims_front = auto_dimension(box, Vector3D(0, 0, -1));
    auto dims_top   = auto_dimension(box, Vector3D(0, -1, 0));
    auto dims_right = auto_dimension(box, Vector3D(-1, 0, 0));

    // All views should produce some dimensions
    EXPECT_GE(dims_front.size(), 1u);
    EXPECT_GE(dims_top.size(), 1u);
    EXPECT_GE(dims_right.size(), 1u);
}

// ═══════════════════════════════════════════════════════════
//  Dimension text formatting
// ═══════════════════════════════════════════════════════════

TEST(AutoDimTest, Dimension_ToText_Basic) {
    Dimension dim;
    dim.type = DimensionType::Linear;
    dim.value = 10.0;
    dim.prefix = "";
    dim.suffix = "mm";

    auto text = dim.to_text();
    EXPECT_NE(text.find("10.00"), std::string::npos);
    EXPECT_NE(text.find("mm"), std::string::npos);
}

TEST(AutoDimTest, Dimension_ToText_WithTolerance) {
    Dimension dim;
    dim.type = DimensionType::Linear;
    dim.value = 25.0;
    dim.tolerance_upper = 0.1;
    dim.tolerance_lower = -0.05;

    auto text = dim.to_text();
    EXPECT_NE(text.find("+0.100"), std::string::npos);
}

TEST(AutoDimTest, Dimension_ToText_Diameter) {
    Dimension dim;
    dim.type = DimensionType::Diameter;
    dim.value = 20.0;
    dim.prefix = "\xC3\x98";  // UTF-8 for Ø

    auto text = dim.to_text();
    EXPECT_FALSE(text.empty());
}

TEST(AutoDimTest, Dimension_ToDxfText_ContainsPosition) {
    Dimension dim;
    dim.value = 15.0;
    dim.text_position = Point3D(100, 200, 0);

    auto text = dim.to_dxf_text();
    EXPECT_NE(text.find("100"), std::string::npos);
    EXPECT_NE(text.find("200"), std::string::npos);
}

// ═══════════════════════════════════════════════════════════
//  smart_placement
// ═══════════════════════════════════════════════════════════

TEST(AutoDimTest, SmartPlacement_DoesNotCrash) {
    std::vector<Dimension> dims;
    for (int i = 0; i < 10; ++i) {
        Dimension d;
        d.type = DimensionType::Linear;
        d.value = static_cast<double>(i);
        d.text_position = Point3D(0, static_cast<double>(i * 5), 0);
        dims.push_back(d);
    }

    smart_placement(dims, Vector3D(0, 0, -1));
    // Should have rearranged positions, all still valid
    for (const auto& d : dims) {
        EXPECT_TRUE(std::isfinite(d.text_position.x()));
        EXPECT_TRUE(std::isfinite(d.text_position.y()));
    }
}

// ═══════════════════════════════════════════════════════════
//  baseline_dimensions
// ═══════════════════════════════════════════════════════════

TEST(AutoDimTest, BaselineDimensions_Box_ReturnsDimensions) {
    auto box = make_box(10, 5, 3);
    auto dims = baseline_dimensions(box, 0, Vector3D(0, 0, -1));
    EXPECT_GE(dims.size(), 1u);
}

TEST(AutoDimTest, BaselineDimensions_InvalidFace_ReturnsEmpty) {
    auto box = make_box(10, 5, 3);
    auto dims = baseline_dimensions(box, -1, Vector3D(0, 0, -1));
    EXPECT_TRUE(dims.empty());

    auto dims2 = baseline_dimensions(box, 9999, Vector3D(0, 0, -1));
    EXPECT_TRUE(dims2.empty());
}

// ═══════════════════════════════════════════════════════════
//  chain_dimensions
// ═══════════════════════════════════════════════════════════

TEST(AutoDimTest, ChainDimensions_TwoFaces_ReturnsDimension) {
    auto box = make_box(10, 5, 3);
    auto dims = chain_dimensions(box, {0, 1}, Vector3D(0, 0, -1));
    EXPECT_GE(dims.size(), 1u);
}

TEST(AutoDimTest, ChainDimensions_SingleFace_ReturnsEmpty) {
    auto box = make_box(10, 5, 3);
    auto dims = chain_dimensions(box, {0}, Vector3D(0, 0, -1));
    EXPECT_TRUE(dims.empty());
}

TEST(AutoDimTest, ChainDimensions_EmptyList_ReturnsEmpty) {
    auto box = make_box(10, 5, 3);
    auto dims = chain_dimensions(box, {}, Vector3D(0, 0, -1));
    EXPECT_TRUE(dims.empty());
}

// ═══════════════════════════════════════════════════════════
//  Dimension type enum coverage
// ═══════════════════════════════════════════════════════════

TEST(AutoDimTest, DimensionType_CoversAllTypes) {
    // Verify all dimension types can be constructed and used
    Dimension linear;
    linear.type = DimensionType::Linear;
    EXPECT_EQ(linear.type, DimensionType::Linear);

    Dimension angular;
    angular.type = DimensionType::Angular;
    EXPECT_EQ(angular.type, DimensionType::Angular);

    Dimension radius;
    radius.type = DimensionType::Radius;
    EXPECT_EQ(radius.type, DimensionType::Radius);

    Dimension diameter;
    diameter.type = DimensionType::Diameter;
    EXPECT_EQ(diameter.type, DimensionType::Diameter);

    Dimension ordinate;
    ordinate.type = DimensionType::Ordinate;
    EXPECT_EQ(ordinate.type, DimensionType::Ordinate);
}