#include <fesa/io/abaqus/active_input.hpp>
#include <fesa/io/abaqus/parser.hpp>

#include <algorithm>
#include <filesystem>
#include <fstream>
#include <stdexcept>
#include <string>
#include <string_view>
#include <system_error>

#include <gtest/gtest.h>

namespace {

class TemporaryDeck final {
public:
    TemporaryDeck(std::string_view name, std::string_view contents)
        : path_{std::filesystem::path{testing::TempDir()} / name} {
        std::ofstream output{path_, std::ios::binary};
        output.write(
            contents.data(), static_cast<std::streamsize>(contents.size()));
        if (!output) {
            throw std::runtime_error{"Failed to write temporary Abaqus deck."};
        }
    }

    ~TemporaryDeck() {
        std::error_code error;
        std::filesystem::remove(path_, error);
    }

    TemporaryDeck(const TemporaryDeck&) = delete;
    TemporaryDeck& operator=(const TemporaryDeck&) = delete;

    [[nodiscard]] const std::filesystem::path& path() const noexcept {
        return path_;
    }

private:
    std::filesystem::path path_;
};

std::filesystem::path fixture_path(std::string_view name) {
    return std::filesystem::path{FESA_TEST_SOURCE_DIR} / "fixtures" /
           "abaqus" / name;
}

fesa::ParsedDeck parse(const std::filesystem::path& path) {
    auto parsed = fesa::parse_deck(path);
    if (!parsed.deck.has_value()) {
        throw std::runtime_error{"Test deck did not parse."};
    }
    return std::move(*parsed.deck);
}

fesa::Diagnostic expect_failure(
    const fesa::ParsedDeck& deck,
    const std::string_view code,
    const std::size_t line) {
    const fesa::ActiveInputResult result = fesa::select_active_input(deck);
    EXPECT_FALSE(result.input.has_value());
    const auto diagnostic = std::ranges::find(
        result.diagnostics, code, &fesa::Diagnostic::code);
    if (diagnostic == result.diagnostics.end()) {
        throw std::runtime_error{"Expected active-input diagnostic was not found."};
    }
    EXPECT_EQ(diagnostic->stage, fesa::DiagnosticStage::semantic);
    EXPECT_TRUE(diagnostic->source.has_value());
    if (diagnostic->source.has_value()) {
        EXPECT_EQ(diagnostic->source->line, line);
    }
    return *diagnostic;
}

TEST(ActiveInput, SelectsFlatGlobalRecords) {
    const fesa::ParsedDeck deck =
        parse(fixture_path("minimal_cantilever.inp"));

    const fesa::ActiveInputResult result = fesa::select_active_input(deck);

    ASSERT_TRUE(result.input.has_value());
    EXPECT_TRUE(result.diagnostics.empty());
    EXPECT_TRUE(result.input->flat);
    EXPECT_TRUE(result.input->part_name.empty());
    EXPECT_TRUE(result.input->instance_name.empty());
    EXPECT_EQ(result.input->part_records.data(), deck.global_records.data());
    EXPECT_EQ(result.input->part_records.size(), deck.global_records.size());
    EXPECT_TRUE(result.input->assembly_records.empty());
}

TEST(ActiveInput, SelectsOnlyTheReferencedPartAndAssemblyRecords) {
    const TemporaryDeck input{
        "fesa-active-input-selection.inp",
        "*PART, NAME=Unused\n"
        "*NODE\n"
        "99, 9.0, 0.0, 0.0\n"
        "*END PART\n"
        "*PART, NAME=BeamPart\n"
        "*NODE\n"
        "1, 0.0, 0.0, 0.0\n"
        "*END PART\n"
        "*ASSEMBLY, NAME=RootAssembly\n"
        "*INSTANCE, NAME=Beam-1, PART=BeamPart\n"
        "*END INSTANCE\n"
        "*NSET, NSET=Fixed, INSTANCE=Beam-1\n"
        "1\n"
        "*END ASSEMBLY\n"};
    const fesa::ParsedDeck deck = parse(input.path());

    const fesa::ActiveInputResult result = fesa::select_active_input(deck);

    ASSERT_TRUE(result.input.has_value());
    EXPECT_FALSE(result.input->flat);
    EXPECT_EQ(result.input->part_name, "BeamPart");
    EXPECT_EQ(result.input->instance_name, "Beam-1");
    ASSERT_EQ(result.input->part_records.size(), 1U);
    EXPECT_EQ(result.input->part_records[0].keyword, "NODE");
    ASSERT_EQ(result.input->assembly_records.size(), 1U);
    EXPECT_EQ(result.input->assembly_records[0].keyword, "NSET");
}

TEST(ActiveInput, RejectsMixedFlatAndHierarchicalMeshAtTheFlatRecord) {
    const fesa::ParsedDeck deck =
        parse(fixture_path("invalid/mixed_mesh.inp"));

    const fesa::Diagnostic diagnostic = expect_failure(
        deck, "abaqus.semantic.mixed_mesh_organization", 1U);

    EXPECT_EQ(diagnostic.source->file, fixture_path("invalid/mixed_mesh.inp"));
}

TEST(ActiveInput, RejectsGlobalSetsInHierarchicalInput) {
    const TemporaryDeck input{
        "fesa-global-set-with-hierarchy.inp",
        "*NSET, NSET=Ignored\n"
        "*PART, NAME=BeamPart\n"
        "*END PART\n"
        "*ASSEMBLY, NAME=RootAssembly\n"
        "*INSTANCE, NAME=Beam-1, PART=BeamPart\n"
        "*END INSTANCE\n"
        "*END ASSEMBLY\n"};

    expect_failure(
        parse(input.path()), "abaqus.semantic.mixed_mesh_organization", 1U);
}

TEST(ActiveInput, RejectsDuplicatePartNamesAtTheSecondDefinition) {
    const TemporaryDeck input{
        "fesa-duplicate-parts.inp",
        "*PART, NAME=BeamPart\n"
        "*END PART\n"
        "*PART, NAME=BeamPart\n"
        "*END PART\n"
        "*ASSEMBLY, NAME=RootAssembly\n"
        "*INSTANCE, NAME=Beam-1, PART=BeamPart\n"
        "*END INSTANCE\n"
        "*END ASSEMBLY\n"};

    expect_failure(
        parse(input.path()), "abaqus.semantic.duplicate_part", 3U);
}

TEST(ActiveInput, RejectsHierarchicalInputWithoutAnAssembly) {
    const TemporaryDeck input{
        "fesa-missing-assembly.inp",
        "*PART, NAME=BeamPart\n"
        "*END PART\n"};
    const fesa::ParsedDeck deck = parse(input.path());

    expect_failure(deck, "abaqus.semantic.assembly_count", 1U);
}

TEST(ActiveInput, RejectsAnAssemblyWithoutExactlyOneInstance) {
    const TemporaryDeck no_instance{
        "fesa-no-instance.inp",
        "*PART, NAME=BeamPart\n"
        "*END PART\n"
        "*ASSEMBLY, NAME=RootAssembly\n"
        "*END ASSEMBLY\n"};
    const TemporaryDeck multiple_instances{
        "fesa-multiple-instances.inp",
        "*PART, NAME=BeamPart\n"
        "*END PART\n"
        "*ASSEMBLY, NAME=RootAssembly\n"
        "*INSTANCE, NAME=Beam-1, PART=BeamPart\n"
        "*END INSTANCE\n"
        "*INSTANCE, NAME=Beam-2, PART=BeamPart\n"
        "*END INSTANCE\n"
        "*END ASSEMBLY\n"};

    expect_failure(
        parse(no_instance.path()), "abaqus.semantic.instance_count", 3U);
    expect_failure(
        parse(multiple_instances.path()),
        "abaqus.semantic.instance_count",
        6U);
}

TEST(ActiveInput, RejectsTransformAtTheFirstTransformDataRow) {
    const fesa::ParsedDeck deck =
        parse(fixture_path("invalid/instance_transform.inp"));

    expect_failure(deck, "abaqus.semantic.instance_transform", 5U);
}

TEST(ActiveInput, RejectsAnInstanceThatReferencesAMissingPart) {
    const TemporaryDeck input{
        "fesa-missing-part.inp",
        "*PART, NAME=OtherPart\n"
        "*END PART\n"
        "*ASSEMBLY, NAME=RootAssembly\n"
        "*INSTANCE, NAME=Beam-1, PART=MissingPart\n"
        "*END INSTANCE\n"
        "*END ASSEMBLY\n"};
    const fesa::ParsedDeck deck = parse(input.path());

    expect_failure(deck, "abaqus.semantic.missing_part", 4U);
}

TEST(ActiveInput, RejectsAssemblySetsForAnotherInstance) {
    const fesa::ParsedDeck deck =
        parse(fixture_path("invalid/assembly_set_wrong_instance.inp"));

    expect_failure(deck, "abaqus.semantic.wrong_instance", 6U);
}

TEST(SemanticScope, RejectsInstanceLocalMeshAtTheKeywordRow) {
    const auto path = fixture_path("invalid/instance_local_mesh.inp");

    const fesa::ParseDeckResult result = fesa::parse_deck(path);

    EXPECT_FALSE(result.deck.has_value());
    ASSERT_EQ(result.diagnostics.size(), 1U);
    EXPECT_EQ(result.diagnostics[0].stage, fesa::DiagnosticStage::syntax);
    EXPECT_EQ(
        result.diagnostics[0].code,
        "abaqus.syntax.instance_local_keyword");
    ASSERT_TRUE(result.diagnostics[0].source.has_value());
    EXPECT_EQ(result.diagnostics[0].source->file, path);
    EXPECT_EQ(result.diagnostics[0].source->line, 5U);
}

}  // namespace