cmake_minimum_required(VERSION 3.0)

project(biboumi)

set(${PROJECT_NAME}_VERSION_MAJOR 5)
set(${PROJECT_NAME}_VERSION_MINOR 0)
set(${PROJECT_NAME}_VERSION_SUFFIX "~dev")

#
## Find optional instrumentation libraries that will be used in debug only
#
find_library(LIBASAN NAMES asan libasan.so.3 libasan.so.2 libasan.so.1)
find_library(LIBUBSAN NAMES ubsan libubsan.so.0)

#
## Set various debug flags (instrumentation libs, coverage, …)
#
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++1y -pedantic -Wall -Wextra -Wconversion")
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
  set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fprofile-arcs -ftest-coverage --coverage")
endif()
if(LIBASAN)
  set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fsanitize=address")
endif()
if(LIBUBSAN)
  set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fsanitize=undefined")
endif()

#
## Set the software version, archive name, RPM name etc
#
set(ARCHIVE_NAME ${CMAKE_PROJECT_NAME}-${${PROJECT_NAME}_VERSION_MAJOR}.${${PROJECT_NAME}_VERSION_MINOR})
set(RPM_VERSION ${${PROJECT_NAME}_VERSION_MAJOR}.${${PROJECT_NAME}_VERSION_MINOR})

if(${PROJECT_NAME}_VERSION_SUFFIX MATCHES ".+")
  set(ARCHIVE_NAME ${ARCHIVE_NAME}${${PROJECT_NAME}_VERSION_SUFFIX})
  set(RPM_VERSION ${RPM_VERSION}${${PROJECT_NAME}_VERSION_SUFFIX})
endif()

if(${PROJECT_NAME}_VERSION_SUFFIX MATCHES "^~dev$")
  # If we are on a dev version, append the hash of the current git HEAD to
  # the version
  include(FindGit)
  if(GIT_FOUND AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
    execute_process(COMMAND git --git-dir=${CMAKE_SOURCE_DIR}/.git rev-parse --short HEAD
      OUTPUT_VARIABLE GIT_REVISION
      OUTPUT_STRIP_TRAILING_WHITESPACE)
    if(GIT_REVISION)
      set(${PROJECT_NAME}_VERSION_SUFFIX "${${PROJECT_NAME}_VERSION_SUFFIX} (${GIT_REVISION})")
      set(ARCHIVE_NAME ${ARCHIVE_NAME}${GIT_REVISION})
      set(RPM_VERSION ${RPM_VERSION}${GIT_REVISION})
    endif()
  endif()
endif()

set(SOFTWARE_VERSION
  ${${PROJECT_NAME}_VERSION_MAJOR}.${${PROJECT_NAME}_VERSION_MINOR}${${PROJECT_NAME}_VERSION_SUFFIX})

#
## The rule that generates the documentation
#
execute_process(COMMAND "date" "+%Y-%m-%d" OUTPUT_VARIABLE DOC_DATE
                OUTPUT_STRIP_TRAILING_WHITESPACE)
set(MAN_PAGE ${CMAKE_CURRENT_BINARY_DIR}/doc/${PROJECT_NAME}.1)
set(DOC_PAGE ${CMAKE_CURRENT_SOURCE_DIR}/doc/${PROJECT_NAME}.1.rst)
if (NOT PANDOC_EXECUTABLE)
  find_program(PANDOC_EXECUTABLE NAMES pandoc
    DOC "The pandoc software, to build the man page from the rst documentation")
  if(PANDOC_EXECUTABLE)
    message(STATUS "Found Pandoc: ${PANDOC_EXECUTABLE}")
    set(WITH_DOC true)
    file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/doc/)
    add_custom_command(OUTPUT ${MAN_PAGE}
      COMMAND ${PANDOC_EXECUTABLE} -M date="${DOC_DATE}" -s -t man ${DOC_PAGE} -o ${MAN_PAGE}
      DEPENDS ${DOC_PAGE})
    add_custom_target(doc ALL DEPENDS ${MAN_PAGE})
  else()
    message(STATUS "Pandoc not found, documentation cannot be built")
  endif()
endif()
mark_as_advanced(PANDOC_EXECUTABLE)

#
## Set this search path for cmake, to find our custom search modules
#
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules/")
find_package(ICONV REQUIRED)
find_package(LIBUUID REQUIRED)
find_package(EXPAT REQUIRED)

#
## Find all the libraries (optional or not)
#
if(WITH_LIBIDN)
  find_package(LIBIDN REQUIRED)
elseif(NOT WITHOUT_LIBIDN)
  find_package(LIBIDN)
endif()

if(WITH_SYSTEMD)
  find_package(SYSTEMD REQUIRED)
elseif(NOT WITHOUT_SYSTEMD)
  find_package(SYSTEMD)
endif()

if(WITH_BOTAN)
  find_package(BOTAN REQUIRED)
elseif(NOT WITHOUT_BOTAN)
  find_package(BOTAN)
endif()

if(NOT BOTAN_FOUND)
  find_package(GCRYPT REQUIRED)
endif()

if(WITH_UDNS)
  find_package(UDNS REQUIRED)
elseif(NOT WITHOUT_UDNS)
  find_package(UDNS)
endif()

if(WITH_LITESQL)
  find_package(LITESQL REQUIRED)
elseif(NOT WITHOUT_LITESQL)
  find_package(LITESQL)
endif()

#
## Set all the include directories, depending on what libraries are used
#
include_directories(${EXPAT_INCLUDE_DIRS})
include_directories(${ICONV_INCLUDE_DIRS})
include_directories(${LIBUUID_INCLUDE_DIRS})
if(SYSTEMD_FOUND)
  include_directories(${SYSTEMD_INCLUDE_DIRS})
endif()
if(BOTAN_FOUND)
  include_directories(SYSTEM ${BOTAN_INCLUDE_DIRS})
endif()
if(UDNS_FOUND)
  include_directories(${UDNS_INCLUDE_DIRS})
endif()

# To be able to include the config.h and other files generated by cmake
include_directories("${CMAKE_CURRENT_BINARY_DIR}/src/")
include_directories("${CMAKE_CURRENT_SOURCE_DIR}/src/")
include_directories("${CMAKE_CURRENT_BINARY_DIR}/")

#
## Define all the modules
#

file(GLOB source_utils
        src/utils/*.[hc]pp)
add_library(utils OBJECT ${source_utils})
add_dependencies(utils litesql_generated_sources)

file(GLOB source_irc
        src/irc/*.[hc]pp)
add_library(irc OBJECT ${source_irc})
add_dependencies(irc litesql_generated_sources)

file(GLOB source_xmpp
        src/xmpp/*.[hc]pp)
add_library(xmpp OBJECT ${source_xmpp})
add_dependencies(xmpp litesql_generated_sources)

file(GLOB source_identd
        src/identd/*.[hc]pp)
add_library(identd OBJECT ${source_identd})

file(GLOB source_bridge
        src/bridge/*.[hc]pp)
add_library(bridge OBJECT ${source_bridge})
add_dependencies(bridge litesql_generated_sources)

file(GLOB source_config
        src/config/*.[hc]pp)
add_library(config OBJECT ${source_config})

file(GLOB source_logger
        src/logger/*.[hc]pp)
add_library(logger OBJECT ${source_logger})

file(GLOB source_network
        src/network/*.[hc]pp)
add_library(network OBJECT ${source_network})

if(LITESQL_FOUND)
  LITESQL_GENERATE_CPP("database/database.xml"
          "biboudb"
          LITESQL_GENERATED_SOURCES)
  add_custom_target(litesql_generated_sources SOURCES ${LITESQL_GENERATED_SOURCES})

  add_library(database OBJECT src/database/database.cpp ${LITESQL_GENERATED_SOURCES})
  add_dependencies(database litesql_generated_sources)

  include_directories(database ${LITESQL_INCLUDE_DIRS})
  set(USE_DATABASE TRUE)
else()
  add_library(database OBJECT "")
  add_custom_target(litesql_generated_sources)
endif()

#
## Define the executables
#

## main
add_executable(${PROJECT_NAME} src/main.cpp
        $<TARGET_OBJECTS:utils>
        $<TARGET_OBJECTS:config>
        $<TARGET_OBJECTS:logger>
        $<TARGET_OBJECTS:network>
        $<TARGET_OBJECTS:xmpp>
        $<TARGET_OBJECTS:bridge>
        $<TARGET_OBJECTS:irc>
        $<TARGET_OBJECTS:identd>
        $<TARGET_OBJECTS:database>)

## test_suite
file(GLOB source_tests
  tests/*.cpp)
add_executable(test_suite ${source_tests}
        $<TARGET_OBJECTS:utils>
        $<TARGET_OBJECTS:config>
        $<TARGET_OBJECTS:logger>
        $<TARGET_OBJECTS:network>
        $<TARGET_OBJECTS:xmpp>
        $<TARGET_OBJECTS:bridge>
        $<TARGET_OBJECTS:irc>
        $<TARGET_OBJECTS:identd>
        $<TARGET_OBJECTS:database>)
set_target_properties(test_suite PROPERTIES EXCLUDE_FROM_ALL TRUE)

#
## Link the executables with their libraries
#
target_link_libraries(${PROJECT_NAME}
        ${ICONV_LIBRARIES}
        ${LIBUUID_LIBRARIES}
        ${EXPAT_LIBRARY})
target_link_libraries(test_suite
        ${ICONV_LIBRARIES}
        ${LIBUUID_LIBRARIES}
        ${EXPAT_LIBRARY})
if(SYSTEMD_FOUND)
  target_link_libraries(${PROJECT_NAME} ${SYSTEMD_LIBRARIES})
  target_link_libraries(test_suite ${SYSTEMD_LIBRARIES})
endif()
if(BOTAN_FOUND)
  target_link_libraries(${PROJECT_NAME} ${BOTAN_LIBRARIES})
  target_link_libraries(test_suite ${BOTAN_LIBRARIES})
elseif(GCRYPT_FOUND)
  target_link_libraries(${PROJECT_NAME} ${GCRYPT_LIBRARIES})
  target_link_libraries(test_suite ${GCRYPT_LIBRARIES})
endif()
if(UDNS_FOUND)
  target_link_libraries(${PROJECT_NAME} ${UDNS_LIBRARIES})
  target_link_libraries(test_suite ${UDNS_LIBRARIES})
endif()
if(LIBIDN_FOUND)
  target_link_libraries(${PROJECT_NAME} ${LIBIDN_LIBRARIES})
  target_link_libraries(test_suite ${LIBIDN_LIBRARIES})
endif()
if(USE_DATABASE)
  target_link_libraries(${PROJECT_NAME} ${LITESQL_LIBRARIES})
  target_link_libraries(test_suite ${LITESQL_LIBRARIES})
endif()

# Define a __FILENAME__ macro with the relative path (from the base project directory)
# of each source file
file(GLOB_RECURSE source_all src/*.[hc]pp tests/*.[hc]pp)
foreach(file ${source_all})
  file(RELATIVE_PATH shorter_file ${CMAKE_CURRENT_SOURCE_DIR} ${file})
  set_property(SOURCE ${file} APPEND PROPERTY COMPILE_DEFINITIONS __FILENAME__="${shorter_file}")
endforeach()

#
## Add a rule to download the catch unit test framework
#
include(ExternalProject)
ExternalProject_Add(catch
  GIT_REPOSITORY "https://lab.louiz.org/louiz/Catch.git"
  PREFIX "external"
  UPDATE_COMMAND ""
  CONFIGURE_COMMAND ""
  BUILD_COMMAND ""
  INSTALL_COMMAND ""
  )
set_target_properties(catch PROPERTIES EXCLUDE_FROM_ALL TRUE)
ExternalProject_Get_Property(catch SOURCE_DIR)
if(NOT EXISTS ${CMAKE_SOURCE_DIR}/tests/catch.hpp)
  target_include_directories(test_suite
    PUBLIC "${SOURCE_DIR}/include/"
    )
  add_dependencies(test_suite catch)
endif()

#
## Add some custom rules to launch the tests
#
add_custom_target(check COMMAND "test_suite"
  DEPENDS test_suite biboumi)
set_target_properties(check PROPERTIES EXCLUDE_FROM_ALL TRUE)
add_custom_target(e2e COMMAND "python3" "${CMAKE_CURRENT_SOURCE_DIR}/tests/end_to_end/"
  DEPENDS biboumi)
set_target_properties(e2e PROPERTIES EXCLUDE_FROM_ALL TRUE)
add_custom_target(e2e_valgrind COMMAND "E2E_BIBOUMI_SUPP_DIR=${CMAKE_CURRENT_SOURCE_DIR}/tests/end_to_end/" "E2E_BIBOUMI_VALGRIND=1" "python3" "${CMAKE_CURRENT_SOURCE_DIR}/tests/end_to_end/"
    DEPENDS biboumi)
if(CMAKE_BUILD_TYPE MATCHES Debug)
  include(CodeCoverage)
  SETUP_TARGET_FOR_COVERAGE(coverage_check
    ./test_suite
    coverage_test_suite)
  add_dependencies(coverage_check test_suite)

  SETUP_TARGET_FOR_COVERAGE(coverage_e2e
    python3
    coverage_e2e
    ${CMAKE_CURRENT_SOURCE_DIR}/tests/end_to_end/)
  add_dependencies(coverage_e2e biboumi)

  ADD_CUSTOM_TARGET(coverage
    COMMAND ${LCOV_PATH} -a coverage_e2e.info -a coverage_test_suite.info -o coverage_total.info

    COMMAND ${GENHTML_PATH} -o coverage_total coverage_total.info

    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
    )
endif()
add_custom_target(everything DEPENDS test_suite biboumi)

#
## Install target
#
install(TARGETS ${PROJECT_NAME} RUNTIME                     DESTINATION bin)
install(FILES   ${MAN_PAGE}                                 DESTINATION share/man/man1         OPTIONAL COMPONENT documentation)
install(FILES   ${CMAKE_CURRENT_BINARY_DIR}/biboumi.service DESTINATION lib/systemd/system     COMPONENT init)
install(FILES   conf/biboumi.cfg                            DESTINATION /etc/biboumi           COMPONENT configuration)
file(GLOB policy_files conf/*policy.txt)
install(FILES   ${policy_files}                             DESTINATION /etc/biboumi           COMPONENT configuration)

#
## Dist target
## Generate a release tarball from the git sources
#
add_custom_command(OUTPUT ${ARCHIVE_NAME}.tar.xz
  COMMAND git archive --prefix=${ARCHIVE_NAME}/ --format=tar HEAD^{tree}
          > ${CMAKE_CURRENT_BINARY_DIR}/${ARCHIVE_NAME}.tar
  # Append this specific file that is not part of the git repo
  COMMAND tar -rf ${CMAKE_CURRENT_BINARY_DIR}/${ARCHIVE_NAME}.tar -P ${SOURCE_DIR}/single_include/catch.hpp --xform 's|/.*/|${ARCHIVE_NAME}/tests/|g'
  # Remove a potential existing archive
  COMMAND rm -f ${CMAKE_CURRENT_BINARY_DIR}/${ARCHIVE_NAME}.tar.xz
  # Compress the archive
  COMMAND xz ${CMAKE_CURRENT_BINARY_DIR}/${ARCHIVE_NAME}.tar
  COMMAND ${CMAKE_COMMAND} -E cmake_echo_color --cyan "${ARCHIVE_NAME}.tar.xz created."
  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
  )
add_custom_target(dist
  DEPENDS ${ARCHIVE_NAME}.tar.xz
  DEPENDS catch)

add_custom_target(rpm
  DEPENDS dist
  COMMAND mkdir -p rpmbuild/{BUILD,RPMS,SOURCES,SPECS,SRPMS}
  COMMAND rpmbuild --define "_topdir `pwd`/rpmbuild/" --define "_sourcedir `pwd`" -ba biboumi.spec
  )

#
## Set some variables that will be used in the cmake-generated files
#
set(SYSTEMD_SERVICE_TYPE_DOCSTRING "The value used as the Type= in the systemd unit file.")
set(WATCHDOG_SEC_DOCSTRING "The value used as WatchdogSec= in the systemd unit file.")
if(SYSTEMD_FOUND)
  set(SYSTEMD_SERVICE_TYPE "notify" CACHE STRING ${SYSTEMD_SERVICE_TYPE_DOCSTRING})
  set(WATCHDOG_SEC "20" CACHE STRING ${WATCHDOG_SEC_DOCSTRING})
else()
  set(SYSTEMD_SERVICE_TYPE "simple" CACHE STRING ${SYSTEMD_SERVICE_TYPE_DOCSTRING})
  set(WATCHDOG_SEC "" CACHE STRING ${WATCHDOG_SEC_DOCSTRING})
endif()
set(SERVICE_USER_DOCSTRING "The value used as the User= in the systemd unit file.")
if(NOT DEFINED SERVICE_USER)
  set(SERVICE_USER "nobody" CACHE STRING ${SERVICE_USER_DOCSTRING})
endif()
set(SERVICE_GROUP_DOCSTRING "The value used as the Group= in the systemd unit file.")
if(NOT DEFINED SERVICE_GROUP)
  set(SERVICE_GROUP "nobody" CACHE STRING ${SERVICE_GROUP_DOCSTRING})
endif()

# Force the format of the date output
set(ENV{LANG} "C")
execute_process(COMMAND "date" "+%a %b %d %Y" OUTPUT_VARIABLE RPM_DATE
                OUTPUT_STRIP_TRAILING_WHITESPACE)
unset(ENV{LANG})

set(POLLER_DOCSTRING "Choose the poller between POLL and EPOLL (Linux-only)")
if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
  set(POLLER "EPOLL" CACHE STRING ${POLLER_DOCSTRING})
else()
  set(POLLER "POLL" CACHE STRING ${POLLER_DOCSTRING})
endif()
if((NOT ${POLLER} MATCHES "POLL") AND
(NOT ${POLLER} MATCHES "EPOLL"))
  message(FATAL_ERROR "POLLER must be either POLL or EPOLL")
endif()

#
## Check if we have std::get_time and put_time
#
include(CheckCXXSourceCompiles)

check_cxx_source_compiles("
  #include <iomanip>
  int main()
  { std::get_time(nullptr, \"\"); }"
        HAS_GET_TIME)

mark_as_advanced(HAS_GET_TIME)

check_cxx_source_compiles("
  #include <iomanip>
  int main()
  { std::put_time(nullptr, \"\"); }"
        HAS_PUT_TIME)

mark_as_advanced(HAS_PUT_TIME)

configure_file(unit/biboumi.service.cmake biboumi.service)
configure_file(packaging/biboumi.spec.cmake biboumi.spec)
configure_file(biboumi.h.cmake src/biboumi.h)