CMakeLists.txt

cmake_minimum_required(VERSION 3.16)
project(NexusDB
    VERSION 1.0.0
    DESCRIPTION "High-performance key-value database engine with B-tree indexing and ACID transactions"
    LANGUAGES CXX
)

# ============================================================================
# Build Options
# ============================================================================
option(NEXUSDB_BUILD_TESTS "Build unit tests" ON)
option(NEXUSDB_BUILD_BENCHMARKS "Build benchmarks" ON)
option(NEXUSDB_BUILD_EXAMPLES "Build examples" ON)
option(NEXUSDB_ENABLE_ASAN "Enable Address Sanitizer" OFF)
option(NEXUSDB_ENABLE_TSAN "Enable Thread Sanitizer" OFF)

# ============================================================================
# C++ Standard and Compiler Settings
# ============================================================================
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# Build type defaults to Release
if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Release CACHE STRING "Build type" FORCE)
endif()

# ============================================================================
# Compiler Flags
# ============================================================================
if(MSVC)
    add_compile_options(/W4 /WX /permissive- /Zc:__cplusplus)
    add_compile_definitions(_CRT_SECURE_NO_WARNINGS _WIN32_WINNT=0x0601)
    if(CMAKE_BUILD_TYPE STREQUAL "Release")
        add_compile_options(/O2 /GL)
        add_link_options(/LTCG)
    endif()
else()
    add_compile_options(-Wall -Wextra -Wpedantic -Werror)
    if(CMAKE_BUILD_TYPE STREQUAL "Release")
        add_compile_options(-O3 -march=native -flto)
        add_link_options(-flto)
    endif()
    if(CMAKE_BUILD_TYPE STREQUAL "Debug")
        add_compile_options(-g -O0)
    endif()
endif()

# Sanitizers
if(NEXUSDB_ENABLE_ASAN AND NOT MSVC)
    add_compile_options(-fsanitize=address -fno-omit-frame-pointer)
    add_link_options(-fsanitize=address)
endif()

if(NEXUSDB_ENABLE_TSAN AND NOT MSVC)
    add_compile_options(-fsanitize=thread)
    add_link_options(-fsanitize=thread)
endif()

# ============================================================================
# Dependencies
# ============================================================================
find_package(Threads REQUIRED)

# ============================================================================
# NexusDB Core Library
# ============================================================================
set(NEXUSDB_SOURCES
    src/btree/btree.cpp
    src/btree/btree_node.cpp
    src/storage/page_manager.cpp
    src/storage/mmap_file.cpp
    src/transaction/wal.cpp
    src/transaction/transaction_manager.cpp
    src/server/tcp_server.cpp
    src/server/protocol.cpp
    src/server/command_handler.cpp
    src/utils/logger.cpp
    src/utils/config.cpp
    src/utils/crc32.cpp
    src/nexusdb.cpp
)

add_library(nexusdb_core STATIC ${NEXUSDB_SOURCES})

target_include_directories(nexusdb_core
    PUBLIC
        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
        $<INSTALL_INTERFACE:include>
    PRIVATE
        ${CMAKE_CURRENT_SOURCE_DIR}/src
)

target_link_libraries(nexusdb_core
    PUBLIC
        Threads::Threads
)

if(WIN32)
    target_link_libraries(nexusdb_core PUBLIC ws2_32)
endif()

# ============================================================================
# NexusDB Server Executable
# ============================================================================
add_executable(nexusdb-server src/main.cpp)
target_link_libraries(nexusdb-server PRIVATE nexusdb_core)

# ============================================================================
# Tests
# ============================================================================
if(NEXUSDB_BUILD_TESTS)
    enable_testing()

    # Download and configure Google Test
    include(FetchContent)
    FetchContent_Declare(
        googletest
        GIT_REPOSITORY https://github.com/google/googletest.git
        GIT_TAG v1.14.0
    )
    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
    FetchContent_MakeAvailable(googletest)

    add_executable(nexusdb_tests
        tests/test_btree.cpp
        tests/test_storage.cpp
        tests/test_transaction.cpp
        tests/test_server.cpp
        tests/test_integration.cpp
    )

    target_link_libraries(nexusdb_tests
        PRIVATE
            nexusdb_core
            GTest::gtest_main
            GTest::gmock
    )

    include(GoogleTest)
    gtest_discover_tests(nexusdb_tests)
endif()

# ============================================================================
# Benchmarks
# ============================================================================
if(NEXUSDB_BUILD_BENCHMARKS)
    # Download and configure Google Benchmark
    include(FetchContent)
    FetchContent_Declare(
        benchmark
        GIT_REPOSITORY https://github.com/google/benchmark.git
        GIT_TAG v1.8.3
    )
    set(BENCHMARK_ENABLE_TESTING OFF CACHE BOOL "" FORCE)
    FetchContent_MakeAvailable(benchmark)

    add_executable(nexusdb_benchmarks
        benchmarks/bench_btree.cpp
        benchmarks/bench_storage.cpp
        benchmarks/bench_throughput.cpp
    )

    target_link_libraries(nexusdb_benchmarks
        PRIVATE
            nexusdb_core
            benchmark::benchmark
    )
endif()

# ============================================================================
# Examples
# ============================================================================
if(NEXUSDB_BUILD_EXAMPLES)
    add_executable(example_basic examples/basic_usage.cpp)
    target_link_libraries(example_basic PRIVATE nexusdb_core)

    add_executable(example_transactions examples/transactions.cpp)
    target_link_libraries(example_transactions PRIVATE nexusdb_core)

    add_executable(example_client examples/tcp_client.cpp)
    target_link_libraries(example_client PRIVATE nexusdb_core)
endif()

# ============================================================================
# Installation
# ============================================================================
install(TARGETS nexusdb_core nexusdb-server
    EXPORT NexusDBTargets
    LIBRARY DESTINATION lib
    ARCHIVE DESTINATION lib
    RUNTIME DESTINATION bin
    INCLUDES DESTINATION include
)

install(DIRECTORY include/ DESTINATION include)

install(EXPORT NexusDBTargets
    FILE NexusDBTargets.cmake
    NAMESPACE NexusDB::
    DESTINATION lib/cmake/NexusDB
)

# ============================================================================
# Package Configuration
# ============================================================================
include(CMakePackageConfigHelpers)

write_basic_package_version_file(
    "${CMAKE_CURRENT_BINARY_DIR}/NexusDBConfigVersion.cmake"
    VERSION ${PROJECT_VERSION}
    COMPATIBILITY SameMajorVersion
)

configure_package_config_file(
    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/NexusDBConfig.cmake.in"
    "${CMAKE_CURRENT_BINARY_DIR}/NexusDBConfig.cmake"
    INSTALL_DESTINATION lib/cmake/NexusDB
)

install(FILES
    "${CMAKE_CURRENT_BINARY_DIR}/NexusDBConfig.cmake"
    "${CMAKE_CURRENT_BINARY_DIR}/NexusDBConfigVersion.cmake"
    DESTINATION lib/cmake/NexusDB
)

# ============================================================================
# Summary
# ============================================================================
message(STATUS "")
message(STATUS "=== NexusDB Configuration Summary ===")
message(STATUS "Version:           ${PROJECT_VERSION}")
message(STATUS "Build type:        ${CMAKE_BUILD_TYPE}")
message(STATUS "C++ Standard:      ${CMAKE_CXX_STANDARD}")
message(STATUS "Build tests:       ${NEXUSDB_BUILD_TESTS}")
message(STATUS "Build benchmarks:  ${NEXUSDB_BUILD_BENCHMARKS}")
message(STATUS "Build examples:    ${NEXUSDB_BUILD_EXAMPLES}")
message(STATUS "Address Sanitizer: ${NEXUSDB_ENABLE_ASAN}")
message(STATUS "Thread Sanitizer:  ${NEXUSDB_ENABLE_TSAN}")
message(STATUS "=====================================")
message(STATUS "")