#
# Copyright(c) 2015 Ruslan Baratov.
# Distributed under the MIT License (http://opensource.org/licenses/MIT)
#

cmake_minimum_required(VERSION 3.1)
project(spdlog VERSION 1.3.1 LANGUAGES CXX)
include(CMakeDependentOption)
include(GNUInstallDirs)

#---------------------------------------------------------------------------------------
# set default build to release
#---------------------------------------------------------------------------------------
if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose Release or Debug" FORCE)
endif()

message(STATUS "Build type: " ${CMAKE_BUILD_TYPE})

#---------------------------------------------------------------------------------------
# compiler config
#---------------------------------------------------------------------------------------
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
    add_compile_options("-Wall")
    add_compile_options("-Wextra")
    add_compile_options("-Wconversion")
    add_compile_options("-pedantic")
    add_compile_options("-Wfatal-errors")
endif()

#---------------------------------------------------------------------------------------
# address sanitizers check
#---------------------------------------------------------------------------------------
include(cmake/sanitizers.cmake)

#---------------------------------------------------------------------------------------
# spdlog target
#---------------------------------------------------------------------------------------
add_library(spdlog INTERFACE)
add_library(spdlog::spdlog ALIAS spdlog)

# Check if spdlog is being used directly or via add_subdirectory
set(SPDLOG_MASTER_PROJECT OFF)
if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
    set(SPDLOG_MASTER_PROJECT ON)
endif()

option(SPDLOG_BUILD_EXAMPLES "Build examples" ${SPDLOG_MASTER_PROJECT})
option(SPDLOG_BUILD_BENCH "Build benchmarks (Requires https://github.com/google/benchmark.git to be installed)" OFF)
option(SPDLOG_BUILD_TESTS "Build tests" ${SPDLOG_MASTER_PROJECT})
option(SPDLOG_FMT_EXTERNAL "Use external fmt library instead of bundled" OFF)
option(SPDLOG_FMT_HEADER_ONLY "Use header-only variant of external fmt library" OFF)
option(SPDLOG_INSTALL "Generate the install target." ${SPDLOG_MASTER_PROJECT})

target_include_directories(
    spdlog
    INTERFACE
    "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
    "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
)

if(SPDLOG_FMT_EXTERNAL)
    target_compile_definitions(spdlog INTERFACE SPDLOG_FMT_EXTERNAL)

    if(NOT TARGET fmt::fmt)
        find_package(fmt REQUIRED CONFIG)
    endif()

    if(SPDLOG_FMT_HEADER_ONLY)
        target_link_libraries(spdlog INTERFACE fmt::fmt-header-only)
    else()
        target_link_libraries(spdlog INTERFACE fmt::fmt)
    endif()
endif()

set(HEADER_BASE "${CMAKE_CURRENT_SOURCE_DIR}/include")

if(SPDLOG_BUILD_EXAMPLES)
    add_subdirectory(example)
endif()

if(SPDLOG_BUILD_TESTS)
    include(CTest)
    add_subdirectory(tests)
endif()

if(SPDLOG_BUILD_BENCH)
    add_subdirectory(bench)
endif()

#---------------------------------------------------------------------------------------
# Install/export targets and files
#---------------------------------------------------------------------------------------
if(SPDLOG_INSTALL)
    # set files and directories
    set(config_install_dir "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
    set(include_install_dir "${CMAKE_INSTALL_INCLUDEDIR}")
    set(pkgconfig_install_dir "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
    set(version_config "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
    set(project_config "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake")
    set(targets_config "${PROJECT_NAME}Targets.cmake")
    set(pkg_config "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc")
    set(targets_export_name "${PROJECT_NAME}Targets")
    set(namespace "${PROJECT_NAME}::")

    # generate package version file
    include(CMakePackageConfigHelpers)
    write_basic_package_version_file(
        "${version_config}" COMPATIBILITY SameMajorVersion
    )

    # configure pkg config file
    configure_file("cmake/spdlog.pc.in" "${pkg_config}" @ONLY)
    # configure spdlogConfig.cmake file
    configure_file("cmake/Config.cmake.in" "${project_config}" @ONLY)

    # install targets
    install(
        TARGETS spdlog
        EXPORT "${targets_export_name}"
    )

    # install headers
    install(
        DIRECTORY "${HEADER_BASE}/${PROJECT_NAME}"
        DESTINATION "${include_install_dir}"
    )

    # install project config and version file
    install(
        FILES "${project_config}" "${version_config}"
        DESTINATION "${config_install_dir}"
    )

    # install pkg config file
    install(
        FILES "${pkg_config}"
        DESTINATION "${pkgconfig_install_dir}"
    )

    # install targets config file
    install(
        EXPORT "${targets_export_name}"
        NAMESPACE "${namespace}"
        DESTINATION "${config_install_dir}"
        FILE ${targets_config}
    )

# export build directory targets file
export(
    EXPORT ${targets_export_name}
    NAMESPACE "${namespace}"
    FILE ${targets_config}
)

# register project in CMake user registry
export(PACKAGE ${PROJECT_NAME})

endif()

file(GLOB_RECURSE spdlog_include_SRCS "${HEADER_BASE}/*.h")
add_custom_target(spdlog_headers_for_ide SOURCES ${spdlog_include_SRCS})