cmake_minimum_required(VERSION 3.10)
project(akerror LANGUAGES C)

include(GNUInstallDirs)
include(CMakePackageConfigHelpers)
include(CTest)

set(AKERR_USE_STDLIB 1 CACHE BOOL "Use the C standard library")
set(akerror_install_cmakedir "${CMAKE_INSTALL_LIBDIR}/cmake/akerror")

set(SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/scripts/generrno.sh)
set(INFILE ${CMAKE_CURRENT_SOURCE_DIR}/include/akerror.tmpl.h)

set(GENERATED_DIR ${CMAKE_CURRENT_BINARY_DIR}/generated)

set(GENERATED_ERRNO_C ${GENERATED_DIR}/src/errno.c)
set(GENERATED_AKERROR_H ${GENERATED_DIR}/include/akerror.h)

add_custom_command(
  OUTPUT ${GENERATED_ERRNO_C} ${GENERATED_AKERROR_H}
  COMMAND ${CMAKE_COMMAND} -E make_directory ${GENERATED_DIR}
  COMMAND /usr/bin/env bash
          ${SCRIPT}
          ${CMAKE_CURRENT_SOURCE_DIR}
          ${GENERATED_DIR}
  DEPENDS ${SCRIPT} ${INFILE}
  VERBATIM
)

add_library(akerror SHARED
  src/error.c
  ${GENERATED_ERRNO_C}
)

target_include_directories(akerror PUBLIC
  $<BUILD_INTERFACE:${GENERATED_DIR}/include>
  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
)

find_package(PkgConfig REQUIRED)
add_library(akerror::akerror ALIAS akerror)

target_compile_definitions(akerror
    PUBLIC AKERR_USE_STDLIB=${AKERR_USE_STDLIB}
)

# Each test is one source file in tests/ built into test_<name> and registered
# as CTest <name>. Tests expected to abort (unhandled error / contract
# violation) go in AKERR_WILL_FAIL_TESTS; all others must exit 0.
set(AKERR_TESTS
    err_catch
    err_cleanup
    err_trace
    err_improper_closure
    err_success
    err_pool_refcount
    err_handle_default
    err_handle_group
    err_handle_dispatch
    err_pass
    err_ignore
    err_swallow
    err_errno
    err_break_variants
    err_custom_handler
    err_error_names
    err_release_clears
    err_pool_exhaust
)

set(AKERR_WILL_FAIL_TESTS
    err_trace
    err_improper_closure
)

foreach(_test IN LISTS AKERR_TESTS)
    add_executable(test_${_test} tests/${_test}.c)
    target_include_directories(test_${_test} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/tests)
    target_link_libraries(test_${_test} PRIVATE akerror)
    add_test(NAME ${_test} COMMAND test_${_test})
endforeach()

set_tests_properties(
    ${AKERR_WILL_FAIL_TESTS}
    PROPERTIES WILL_FAIL TRUE
)

# Mutation testing: break the library in small ways and confirm the test suite
# notices. This is a meta-check on the tests themselves, so it is a manual
# target (it rebuilds and re-runs the whole suite many times), not a CTest test.
#   cmake --build build --target mutation
find_package(Python3 COMPONENTS Interpreter)
if(Python3_FOUND)
    add_custom_target(mutation
        COMMAND ${Python3_EXECUTABLE}
                ${CMAKE_CURRENT_SOURCE_DIR}/scripts/mutation_test.py
                --source-root ${CMAKE_CURRENT_SOURCE_DIR}
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
        USES_TERMINAL
        COMMENT "Running mutation tests (breaks the library, expects tests to fail)"
    )
endif()

set(main_lib_dest "lib/my_library-${MY_LIBRARY_VERSION}")
install(TARGETS akerror
  EXPORT akerrorTargets
  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
  INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
)

install(FILES ${GENERATED_AKERROR_H} DESTINATION "include/")
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/akerror.pc DESTINATION "lib/pkgconfig/")

install(EXPORT akerrorTargets
    FILE akerrorTargets.cmake
    NAMESPACE akerror::
    DESTINATION ${akerror_install_cmakedir}
)

configure_package_config_file(
    cmake/akerror.cmake.in
    "${CMAKE_CURRENT_BINARY_DIR}/akerrorConfig.cmake"
    INSTALL_DESTINATION ${akerror_install_cmakedir}
)

install(FILES
    "${CMAKE_CURRENT_BINARY_DIR}/akerrorConfig.cmake"
    DESTINATION ${akerror_install_cmakedir}
)

# pkgconfig
set(prefix      ${CMAKE_INSTALL_PREFIX})
set(exec_prefix "\${prefix}")
set(libdir      "\${exec_prefix}/lib")
set(includedir  "\${prefix}/include")
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/akerror.pc.in ${CMAKE_CURRENT_BINARY_DIR}/akerror.pc @ONLY)