CMAKE_MINIMUM_REQUIRED(VERSION 2.8.1)
PROJECT(libtins)

# Compile in release mode by default
IF(NOT CMAKE_BUILD_TYPE)
    MESSAGE(STATUS "Setting build type to 'RelWithDebInfo' as none was specified.")
    SET(CMAKE_BUILD_TYPE RelWithDebInfo) 
ELSE(NOT CMAKE_BUILD_TYPE)
    MESSAGE(STATUS "Using specified '${CMAKE_BUILD_TYPE}' build type.")
ENDIF(NOT CMAKE_BUILD_TYPE)

# Compilation flags.
IF(MSVC)
    # Don't always use Wall, since VC's /Wall is ridiculously verbose.
    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W3")
    # Disable VC secure checks, since these are not really issues.
    ADD_DEFINITIONS("-D_CRT_SECURE_NO_WARNINGS=1")
    ADD_DEFINITIONS("-D_SCL_SECURE_NO_WARNINGS=1")
ELSE()
    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
    # Fix for Clang on OSX
    ADD_DEFINITIONS("-DGTEST_HAS_TR1_TUPLE=0")
ENDIF()

# Build output checks
OPTION(LIBTINS_BUILD_SHARED "Build libtins as a shared library." ON)
IF(LIBTINS_BUILD_SHARED)
    MESSAGE(
        STATUS 
        "Build will generate a shared library. "
        "Use LIBTINS_BUILD_SHARED=0 to perform a static build"
    )
    SET(LIBTINS_TYPE SHARED)
ELSE(LIBTINS_BUILD_SHARED)
    MESSAGE(STATUS "Build will generate a static library.")
    SET(LIBTINS_TYPE STATIC)
ENDIF(LIBTINS_BUILD_SHARED)

# The version number.
SET(LIBTINS_VERSION_MAJOR 3)
SET(LIBTINS_VERSION_MINOR 3)
SET(LIBTINS_VERSION "${LIBTINS_VERSION_MAJOR}.${LIBTINS_VERSION_MINOR}")

# Required Packages
SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")

# Look for libpcap
FIND_PACKAGE(PCAP REQUIRED)

# Set some Windows specific flags
IF(WIN32)
    # We need to link against these libs
    SET(LIBTINS_OS_LIBS Ws2_32.lib Iphlpapi.lib)

    # Add the NOMINMAX macro to avoid Windows' min and max macros.
    ADD_DEFINITIONS(-DNOMINMAX)
ENDIF(WIN32)

# *******************
# Compilation options
# *******************

# C++11 support
OPTION(LIBTINS_ENABLE_CXX11 "Compile libtins with c++11 features" OFF)
IF(LIBTINS_ENABLE_CXX11)
    SET(HAVE_CXX11 ON)
    INCLUDE(CheckCXX11Features)
    IF(HAS_CXX11_NULLPTR AND HAS_CXX11_RVALUE_REFERENCES)
        MESSAGE(STATUS "Enabling C++11 features")
        SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX11_COMPILER_FLAGS}")
    ELSE(HAS_CXX11_NULLPTR AND HAS_CXX11_RVALUE_REFERENCES)
        MESSAGE(FATAL_ERROR "C++11 features requested but the compiler does not support them.")
    ENDIF(HAS_CXX11_NULLPTR AND HAS_CXX11_RVALUE_REFERENCES)
ELSE(LIBTINS_ENABLE_CXX11)
    MESSAGE(
        WARNING 
        "Disabling C++11 features. Use LIBTINS_ENABLE_CXX11=1 to enable them. "
        "Unless you are using an old compiler, you should enable this option, "
        "as it increases the library's performance")
ENDIF(LIBTINS_ENABLE_CXX11)

# IEEE 802.11 and WPA2 decryption support
OPTION(LIBTINS_ENABLE_DOT11 "Compile libtins with IEEE 802.11 support" ON)
OPTION(LIBTINS_ENABLE_WPA2 "Compile libtins with WPA2 decryption features (requires OpenSSL)" ON)
IF(LIBTINS_ENABLE_DOT11)
    SET(HAVE_DOT11 ON)
    MESSAGE(STATUS "Enabling IEEE 802.11 support.")
    IF(LIBTINS_ENABLE_WPA2)
        FIND_PACKAGE(OpenSSL REQUIRED)
        SET(HAVE_WPA2_DECRYPTION ON)
        MESSAGE(STATUS "Enabling WPA2 decryption support.")
    ELSE(LIBTINS_ENABLE_WPA2)
        MESSAGE(STATUS "Disabling WPA2 decryption support.")
    ENDIF(LIBTINS_ENABLE_WPA2)
ENDIF(LIBTINS_ENABLE_DOT11)

# Use pcap_sendpacket to send l2 packets rather than raw sockets
IF(WIN32)
    SET(USE_PCAP_SENDPACKET_DEFAULT ON)
ELSE(WIN32)
    SET(USE_PCAP_SENDPACKET_DEFAULT OFF)
ENDIF(WIN32)

OPTION(LIBTINS_USE_PCAP_SENDPACKET "Use pcap_sendpacket to send l2 packets"
        ${USE_PCAP_SENDPACKET_DEFAULT})
IF(LIBTINS_USE_PCAP_SENDPACKET)
    SET(HAVE_PACKET_SENDER_PCAP_SENDPACKET ON)
    MESSAGE(STATUS "Using pcap_sendpacket to send l2 packets.")
ENDIF(LIBTINS_USE_PCAP_SENDPACKET)

# Add a target to generate API documentation using Doxygen
FIND_PACKAGE(Doxygen QUIET)
IF(DOXYGEN_FOUND)
    CONFIGURE_FILE(
        ${CMAKE_CURRENT_SOURCE_DIR}/docs/Doxyfile.in 
        ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile 
        @ONLY
    )
    ADD_CUSTOM_TARGET(
        docs
        ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
        COMMENT "Generating API documentation with Doxygen" VERBATIM
    )
ENDIF(DOXYGEN_FOUND)

# The library output directory
SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)

# Configuration file
CONFIGURE_FILE(
  "${PROJECT_SOURCE_DIR}/include/tins/config.h.in"
  "${PROJECT_SOURCE_DIR}/include/tins/config.h"
)

# Support for pkg-config
SET(CMAKE_INSTALL_LIBDIR lib)
SET(pkgconfig_prefix      ${CMAKE_INSTALL_PREFIX})
SET(pkgconfig_exec_prefix ${CMAKE_INSTALL_PREFIX})
SET(pkgconfig_libdir      ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
SET(pkgconfig_version     ${LIBTINS_VERSION})
CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/libtins.pc.in
                ${CMAKE_CURRENT_BINARY_DIR}/libtins.pc @ONLY)

INSTALL(
    FILES
    ${CMAKE_CURRENT_BINARY_DIR}/libtins.pc
    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
)

# ******************
# Add subdirectories
# ******************
ADD_SUBDIRECTORY(include)
ADD_SUBDIRECTORY(src)
ADD_SUBDIRECTORY(examples)

# Only include googletest if the git submodule has been fetched
IF(EXISTS "${CMAKE_SOURCE_DIR}/googletest/CMakeLists.txt")
    # Enable tests and add the test directory
    MESSAGE(STATUS "Tests have been enabled")
    SET(gtest_force_shared_crt ON CACHE BOOL "Always use /MD")
    ENABLE_TESTING()
    ADD_SUBDIRECTORY(googletest)
    ADD_SUBDIRECTORY(tests)
ELSE()
    MESSAGE(STATUS "googletest git submodule is absent. Run `git submodule init && git submodule update` to get it")
ENDIF()

# **********************************
# CMake project configuration export
# **********************************

# Add all targets to the build-tree export set
EXPORT(
    TARGETS tins
    FILE "${PROJECT_BINARY_DIR}/libtinsTargets.cmake"
)

# Export the package for use from the build-tree
# (this registers the build-tree with a global CMake-registry)
EXPORT(PACKAGE libtins)

# Create the libtinsConfig.cmake and libtinsConfigVersion.cmake files
# for the build tree
SET(CONF_INCLUDE_DIRS "${PROJECT_SOURCE_DIR}/include")
CONFIGURE_FILE(
    cmake/libtinsConfig.cmake.in
    "${PROJECT_BINARY_DIR}/libtinsConfig.cmake" @ONLY
)
CONFIGURE_FILE(
    cmake/libtinsConfigVersion.cmake.in
    "${PROJECT_BINARY_DIR}/libtinsConfigVersion.cmake" @ONLY
)
# Install the libtinsConfig.cmake and libtinsConfigVersion.cmake
INSTALL(
    FILES
    "${PROJECT_BINARY_DIR}/libtinsConfig.cmake"
    "${PROJECT_BINARY_DIR}/libtinsConfigVersion.cmake"
    DESTINATION CMake
    COMPONENT dev
)

# Install the export set for use with the install-tree
INSTALL(
    EXPORT libtinsTargets
    DESTINATION CMake
    COMPONENT dev
)