#include <gtest/gtest.h>

#include <algorithm>
#include <array>
#include <limits>
#include <string_view>
#include <utility>

#include <fesa/results/result_database.hpp>

namespace {

std::array<double, 6> zeros() {
    return {0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
}

fesa::ResultDatabase valid_database() {
    fesa::NodalFrame nodal{
        {fesa::NodeId{0}, fesa::NodeId{1}},
        {
            fesa::EntityOrigin{"BeamPart", "Beam-1", 10},
            fesa::EntityOrigin{"BeamPart", "Beam-1", 20},
        },
        {
            zeros(),
            {1.0, 2.0, 3.0, 0.1, 0.2, 0.3},
        },
        {
            {-10.0, -20.0, -30.0, -1.0, -2.0, -3.0},
            zeros(),
        },
    };
    fesa::BeamElementFrame beam{
        fesa::ElementId{3},
        fesa::EntityOrigin{"BeamPart", "Beam-1", 30},
        {
            fesa::Vec3{1.0, 0.0, 0.0},
            fesa::Vec3{0.0, 1.0, 0.0},
            fesa::Vec3{0.0, 0.0, 1.0},
        },
        {{
            {
                -1.0,
                fesa::NodeId{0},
                zeros(),
                zeros(),
                0.0,
                {1.0},
            },
            {
                1.0,
                fesa::NodeId{1},
                zeros(),
                zeros(),
                0.0,
                {2.0},
            },
        }},
    };
    fesa::ResultFrame frame{
        1.0,
        std::move(nodal),
        {{std::move(beam)}},
        {},
    };
    fesa::ResultStep step{"Load", {std::move(frame)}};
    return {"1.0.0", {std::move(step)}};
}

bool has_diagnostic(
    const fesa::Status& status,
    const std::string_view code) {
    return std::ranges::any_of(
        status.diagnostics,
        [code](const fesa::Diagnostic& diagnostic) {
            return diagnostic.code == code &&
                   diagnostic.stage == fesa::DiagnosticStage::results &&
                   diagnostic.severity == fesa::Severity::error;
        });
}

TEST(NodalFrame, AcceptsFiniteSixComponentFieldsWithMatchingNodeIds) {
    const auto database = valid_database();

    const auto status = fesa::validate_result_database(database);

    EXPECT_TRUE(status.succeeded);
    EXPECT_TRUE(status.diagnostics.empty());
}

TEST(NodalFrame, RejectsDisplacementSizeMismatch) {
    auto database = valid_database();
    database.steps[0].frames[0].nodal.displacement.pop_back();

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.nodal_size_mismatch"));
}

TEST(NodalFrame, RejectsReactionSizeMismatch) {
    auto database = valid_database();
    database.steps[0].frames[0].nodal.reaction.pop_back();

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.nodal_size_mismatch"));
}

TEST(CompleteResultContract, RejectsNodeOriginSizeMismatch) {
    auto database = valid_database();
    database.steps[0].frames[0].nodal.origins.pop_back();

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(
        status, "results.nodal_origin_size_mismatch"));
}

TEST(NodalFrame, RejectsDuplicateNodeId) {
    auto database = valid_database();
    database.steps[0].frames[0].nodal.node_ids[1] = fesa::NodeId{0};

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.duplicate_node_id"));
}

TEST(NodalFrame, RejectsNonfiniteDisplacement) {
    auto database = valid_database();
    database.steps[0].frames[0].nodal.displacement[1][2] =
        std::numeric_limits<double>::quiet_NaN();

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.nonfinite_value"));
}

TEST(NodalFrame, RejectsNonfiniteReaction) {
    auto database = valid_database();
    database.steps[0].frames[0].nodal.reaction[0][4] =
        std::numeric_limits<double>::infinity();

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.nonfinite_value"));
}

TEST(ResultDatabase, RejectsDuplicateStepName) {
    auto database = valid_database();
    database.steps.push_back(database.steps[0]);

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.duplicate_step_name"));
}

TEST(ResultDatabase, RejectsDuplicateFrameTimeWithinStep) {
    auto database = valid_database();
    database.steps[0].frames.push_back(database.steps[0].frames[0]);

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.duplicate_frame_time"));
}

TEST(ResultDatabase, RejectsNonfiniteFrameTime) {
    auto database = valid_database();
    database.steps[0].frames[0].step_time =
        std::numeric_limits<double>::quiet_NaN();

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.nonfinite_value"));
}

TEST(CompleteResultContract, DeclaresCoordinatesAndComponentOrdering) {
    EXPECT_EQ(
        fesa::NodalFrame::coordinate_system,
        fesa::FieldCoordinateSystem::global);
    EXPECT_EQ(
        fesa::NodalFrame::displacement_components,
        (std::array<std::string_view, 6>{
            "Ux", "Uy", "Uz", "Rx", "Ry", "Rz"}));
    EXPECT_EQ(
        fesa::NodalFrame::reaction_components,
        (std::array<std::string_view, 6>{
            "RFx", "RFy", "RFz", "RMx", "RMy", "RMz"}));
    EXPECT_EQ(
        fesa::BeamElementFrame::coordinate_system,
        fesa::FieldCoordinateSystem::element_local);
    EXPECT_EQ(
        fesa::BeamElementFrame::section_strain_components,
        (std::array<std::string_view, 6>{
            "epsilon", "gamma_y", "gamma_z", "kappa_x", "kappa_y",
            "kappa_z"}));
    EXPECT_EQ(
        fesa::BeamElementFrame::section_force_components,
        (std::array<std::string_view, 6>{
            "N", "Vy", "Vz", "T", "My", "Mz"}));
    EXPECT_EQ(
        fesa::BeamElementFrame::axial_stress_component,
        std::string_view{"sigma_xx"});
}

TEST(ElementFrame, AcceptsFiniteConnectedBeamResults) {
    const auto status = fesa::validate_result_database(valid_database());

    EXPECT_TRUE(status.succeeded);
    EXPECT_TRUE(status.diagnostics.empty());
}

TEST(ElementFrame, RejectsDuplicateElementId) {
    auto database = valid_database();
    auto& beams = database.steps[0].frames[0].element.beams;
    beams.push_back(beams[0]);

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.duplicate_element_id"));
}

TEST(ElementFrame, RejectsDuplicateEndNode) {
    auto database = valid_database();
    auto& ends = database.steps[0].frames[0]
                     .element.beams[0].end_results;
    ends[1].end_node = ends[0].end_node;

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.duplicate_beam_end_node"));
}

TEST(ElementFrame, RejectsWrongEndConnectivity) {
    auto database = valid_database();
    database.steps[0].frames[0]
        .element.beams[0].end_results[0].xi = 1.0;

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.invalid_beam_connectivity"));
}

TEST(ElementFrame, RejectsEndNodeAbsentFromNodalFrame) {
    auto database = valid_database();
    database.steps[0].frames[0]
        .element.beams[0].end_results[1].end_node = fesa::NodeId{99};

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.invalid_beam_connectivity"));
}

TEST(ElementFrame, RejectsNonfiniteLocalFrameAndSectionValue) {
    auto database = valid_database();
    auto& beam = database.steps[0].frames[0].element.beams[0];
    beam.local_frame.ey.y = std::numeric_limits<double>::infinity();
    beam.end_results[1].section_force[4] =
        std::numeric_limits<double>::quiet_NaN();

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(status, "results.nonfinite_value"));
}

TEST(ElementFrame, RejectsMismatchedRecoveryPointCount) {
    auto database = valid_database();
    database.steps[0].frames[0]
        .element.beams[0].end_results[1].sigma_xx.push_back(3.0);

    const auto status = fesa::validate_result_database(database);

    EXPECT_FALSE(status.succeeded);
    EXPECT_TRUE(has_diagnostic(
        status, "results.recovery_point_count_mismatch"));
}

}  // namespace