cmake_minimum_required(VERSION 3.10)

project("Pangolin")
set(PANGOLIN_VERSION_MAJOR 0)
set(PANGOLIN_VERSION_MINOR 8)
set(PANGOLIN_VERSION ${PANGOLIN_VERSION_MAJOR}.${PANGOLIN_VERSION_MINOR})

if(NOT CMAKE_CXX_STANDARD)
    set(CMAKE_CXX_STANDARD 17)
    set(CMAKE_CXX_STANDARD_REQUIRED ON)
endif()

# Prevent in source builds
if(EXISTS "${PROJECT_BINARY_DIR}/CMakeLists.txt")
    message(FATAL_ERROR "Source build detected: please use a subdir. You may remove 'CMakeCache.txt' and 'CMakeFiles'.")
endif()

# Make our own cmake imports accessible
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")

include(SetPlatformVars)
include(PangolinFactory)

option( BUILD_TOOLS "Build Tools" ON )
option( BUILD_EXAMPLES "Build Examples" ON )
option( BUILD_ASAN "Enable AddressSanitizer for Debug builds" OFF )

# Default build type (Override with cmake .. -DCMAKE_BUILD_TYPE=...)
if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
  set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose the type of build." FORCE)
  message(STATUS "Setting build type to '${CMAKE_BUILD_TYPE}' as none was specified.")
  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
endif()

if(_WIN_)
    option( BUILD_SHARED_LIBS    "Build Shared Library" OFF)
    option( MSVC_USE_STATIC_CRT  "Use static C Runtime with MSVC, /MT instead of /MD" ON)

    # Make sure there are no erroneous C Runtime flags
    list(APPEND FLAG_VARS
        CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO
        CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO
    )
    if(MSVC_USE_STATIC_CRT)
        foreach(FLAG_VAR ${FLAG_VARS})
            string(REGEX REPLACE "/MD" "/MT" NEW_FLAGS "${${FLAG_VAR}}")
            set(${FLAG_VAR} "${NEW_FLAGS}" CACHE STRING "" FORCE)
        endforeach()
    else()
        foreach(FLAG_VAR ${FLAG_VARS})
            string(REGEX REPLACE "/MT" "/MD" NEW_FLAGS "${${FLAG_VAR}}")
            set(${FLAG_VAR} "${NEW_FLAGS}" CACHE STRING "" FORCE)
        endforeach()
    endif()
elseif(_OSX_)
    option( BUILD_SHARED_LIBS "Build Shared Library" ON)
    set(CMAKE_MACOSX_RPATH ON)
elseif(EMSCRIPTEN)
    set(BUILD_SHARED_LIBS OFF)
    include(EmscriptenUtils)
    set(CMAKE_EXE_LINKER_FLAGS "-sASYNCIFY=1 -sDISABLE_EXCEPTION_CATCHING=0 -sGL_ASSERTIONS=1 -sFULL_ES2=1 -sFULL_ES3=1 --bind")
else()
    option( BUILD_SHARED_LIBS "Build Shared Library" ON)
endif()

# run with "ASAN_OPTIONS=fast_unwind_on_malloc=0" to print stack with more details
if(BUILD_ASAN)
    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} \
        -fsanitize=address \
        -fsanitize=bool \
        -fsanitize=bounds \
        -fsanitize=enum \
        -fsanitize=float-cast-overflow \
        -fsanitize=float-divide-by-zero \
        -fsanitize=nonnull-attribute \
        -fsanitize=returns-nonnull-attribute \
        -fsanitize=signed-integer-overflow \
        -fsanitize=undefined \
        -fsanitize=vla-bound \
        -fno-sanitize=alignment \
        -fsanitize=leak \
        -fsanitize=object-size \
    ")
endif()

#######################################################
## Testing setup

option( BUILD_TESTS "Build Tests" OFF)
find_package(Catch2 2 QUIET)
if(Catch2_FOUND)
    include(CTest)
    include(Catch)
else()
    if(BUILD_TESTS)
        message(WARNING "Building Tests requested, but Catch2 library not found.")
        set( BUILD_TESTS OFF)
    endif()
endif()

#######################################################
## Add all pangolin components

file(GLOB components_cmake "${CMAKE_CURRENT_LIST_DIR}/components/*/CMakeLists.txt")
set(component_list "")
foreach(component_cmake ${components_cmake})
    get_filename_component(component_dir ${component_cmake} DIRECTORY)
    get_filename_component(component_name ${component_dir} NAME)
    add_library(${component_name} "")
    list(APPEND component_list ${component_name})
endforeach()

foreach(component_cmake ${components_cmake})
    include(${component_cmake})
endforeach()

#######################################################
## Build Tree Export

# Export Targets
export(TARGETS ${component_list} FILE PangolinTargets.cmake)
export(PACKAGE Pangolin)

# Version information
configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/cmake/${PROJECT_NAME}ConfigVersion.cmake.in
"${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake" @ONLY)

# Build tree config
configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake.in
${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake @ONLY IMMEDIATE )


#######################################################
## Install headers / targets

# This relative path allows installed files to be relocatable.
set( CMAKECONFIG_INSTALL_DIR lib/cmake/${PROJECT_NAME} )
file( RELATIVE_PATH REL_INCLUDE_DIR
    "${CMAKE_INSTALL_PREFIX}/${CMAKECONFIG_INSTALL_DIR}"
    "${CMAKE_INSTALL_PREFIX}/include"
)

install(
    TARGETS ${component_list}
    EXPORT ${PROJECT_NAME}Targets
    LIBRARY DESTINATION lib
    ARCHIVE DESTINATION lib
    RUNTIME DESTINATION bin
    INCLUDES DESTINATION include
)

install(
    FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
          "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
    DESTINATION ${CMAKECONFIG_INSTALL_DIR}
)
install(
    EXPORT ${PROJECT_NAME}Targets DESTINATION ${CMAKECONFIG_INSTALL_DIR}
)

# uninstall target
if(NOT TARGET uninstall)
  configure_file(
    "${CMAKE_CURRENT_LIST_DIR}/cmake/cmake_uninstall.cmake.in"
    "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"
    IMMEDIATE @ONLY)

  add_custom_target(uninstall
    COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake)
endif()


#######################################################
## Tools / Examples

set(Pangolin_DIR ${CMAKE_CURRENT_BINARY_DIR})

if(BUILD_EXAMPLES)
    add_subdirectory(examples)
endif()

if(BUILD_TOOLS)
    add_subdirectory(tools)
endif()