cmake_minimum_required(VERSION 2.8.12)

# force out-of-source build
if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
    message(FATAL_ERROR "In-source build is not allowed. Please make a standalone build directory and run CMake from there. You may need to remove CMakeCache.txt.")
endif()

project(libyang C)

# include custom Modules
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/CMakeModules/")

include(GNUInstallDirs)
include(CheckSymbolExists)
include(UseCompat)
include(ABICheck)
include(SourceFormat)
include(Doc)

# set default build type if not specified by user
if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Debug)
endif()
# normalize build type string
string(TOUPPER "${CMAKE_BUILD_TYPE}" BUILD_TYPE_UPPER)
if ("${BUILD_TYPE_UPPER}" STREQUAL "RELEASE")
  set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Build Type" FORCE)
elseif ("${BUILD_TYPE_UPPER}" STREQUAL "DEBUG")
  set(CMAKE_BUILD_TYPE "Debug" CACHE STRING "Build Type" FORCE)
elseif ("${BUILD_TYPE_UPPER}" STREQUAL "RELWITHDEBINFO")
  set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING "Build Type" FORCE)
elseif ("${BUILD_TYPE_UPPER}" STREQUAL "RELWITHDEBUG")
  set(CMAKE_BUILD_TYPE "RelWithDebug" CACHE STRING "Build Type" FORCE)
elseif ("${BUILD_TYPE_UPPER}" STREQUAL "ABICHECK")
  set(CMAKE_BUILD_TYPE "ABICheck" CACHE STRING "Build Type" FORCE)
elseif ("${BUILD_TYPE_UPPER}" STREQUAL "DOCONLY")
  set(CMAKE_BUILD_TYPE "DocOnly" CACHE STRING "Build Type" FORCE)
else ()
  message(FATAL_ERROR "Unknown CMAKE_BUILD_TYPE \"${CMAKE_BUILD_TYPE}\".")
endif ()

# check the supported platform
if(NOT UNIX)
    message(FATAL_ERROR "Only *nix like systems are supported.")
endif()

#
# variables
#

set(LIBYANG_DESCRIPTION "libyang is YANG data modelling language parser and toolkit written (and providing API) in C.")

# Correct RPATH usage on OS X
set(CMAKE_MACOSX_RPATH TRUE)

# keep all binaries in the build directory
set (CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})

# set version of the project
set(LIBYANG_MAJOR_VERSION 2)
set(LIBYANG_MINOR_VERSION 0)
set(LIBYANG_MICRO_VERSION 0)
set(LIBYANG_VERSION ${LIBYANG_MAJOR_VERSION}.${LIBYANG_MINOR_VERSION}.${LIBYANG_MICRO_VERSION})
# set version of the library
set(LIBYANG_MAJOR_SOVERSION 2)
set(LIBYANG_MINOR_SOVERSION 0)
set(LIBYANG_MICRO_SOVERSION 0)
set(LIBYANG_SOVERSION_FULL ${LIBYANG_MAJOR_SOVERSION}.${LIBYANG_MINOR_SOVERSION}.${LIBYANG_MICRO_SOVERSION})
set(LIBYANG_SOVERSION ${LIBYANG_MAJOR_SOVERSION})

if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    set(COMPILER_UNUSED_ATTR "UNUSED_ ## x __attribute__((__unused__))")
    set(COMPILER_PACKED_ATTR "__attribute__((__packed__))")
elseif(CMAKE_C_COMPILER_ID STREQUAL "Clang")
    set(COMPILER_UNUSED_ATTR "UNUSED_ ## x __attribute__((__unused__))")
    set(COMPILER_PACKED_ATTR "__attribute__((__packed__))")
else()
    set(COMPILER_UNUSED_ATTR "UNUSED_ ## x")
    set(COMPILER_PACKED_ATTR "")
endif()

set(CMAKE_C_FLAGS                "${CMAKE_C_FLAGS} -Wall -Wextra -Wno-missing-field-initializers -std=c99")
set(CMAKE_C_FLAGS_DEBUG          "-g3 -O0")
set(CMAKE_C_FLAGS_ABICHECK       "-g -Og")

include_directories(${PROJECT_BINARY_DIR}/src ${PROJECT_SOURCE_DIR}/src)

# type plugins are separate because they have their documentation generated
set(type_plugins
    src/plugins_types/binary.c
    src/plugins_types/bits.c
    src/plugins_types/boolean.c
    src/plugins_types/decimal64.c
    src/plugins_types/empty.c
    src/plugins_types/enumeration.c
    src/plugins_types/identityref.c
    src/plugins_types/instanceid.c
    src/plugins_types/integer.c
    src/plugins_types/leafref.c
    src/plugins_types/string.c
    src/plugins_types/union.c
    src/plugins_types/ipv4_address.c
    src/plugins_types/ipv4_address_no_zone.c
    src/plugins_types/ipv6_address.c
    src/plugins_types/ipv6_address_no_zone.c
    src/plugins_types/ipv4_prefix.c
    src/plugins_types/ipv6_prefix.c
    src/plugins_types/date_and_time.c
    src/plugins_types/xpath1.0.c)

set(libsrc
    src/common.c
    src/log.c
    src/hash_table.c
    src/set.c
    src/path.c
    src/diff.c
    src/context.c
    src/json.c
    src/tree_data.c
    src/tree_data_free.c
    src/tree_data_helpers.c
    src/tree_data_hash.c
    src/parser_xml.c
    src/parser_json.c
    src/parser_lyb.c
    src/out.c
    src/printer_data.c
    src/printer_xml.c
    src/printer_json.c
    src/printer_lyb.c
    src/schema_compile.c
    src/schema_compile_node.c
    src/schema_compile_amend.c
    src/schema_features.c
    src/tree_schema.c
    src/tree_schema_free.c
    src/tree_schema_helpers.c
    src/in.c
    src/lyb.c
    src/parser_yang.c
    src/parser_yin.c
    src/parser_stmt.c
    src/printer_schema.c
    src/printer_yang.c
    src/printer_yin.c
    src/printer_tree.c
    src/plugins.c
    src/plugins_types.c
    src/plugins_exts.c
    src/plugins_exts/metadata.c
    src/plugins_exts/nacm.c
    src/plugins_exts/yangdata.c
    src/xml.c
    src/xpath.c
    src/validation.c
    ${type_plugins})

set(headers
    src/libyang.h
    src/context.h
    src/dict.h
    src/log.h
    src/in.h
    src/parser_data.h
    src/parser_schema.h
    src/plugins.h
    src/plugins_exts.h
    src/plugins_exts_compile.h
    src/plugins_exts_print.h
    src/plugins_types.h
    src/out.h
    src/printer_data.h
    src/printer_schema.h
    src/set.h
    src/tree.h
    src/tree_edit.h
    src/tree_data.h
    src/tree_schema.h)

set(gen_headers
    src/version.h
    src/config.h)

# source files to be covered by the 'format' target
set(format_sources
    compat/*
    src/*.c
    src/*.h
    src/plugins_exts/*
    src/plugins_types/*)
#
# options
#

if("${BUILD_TYPE_UPPER}" STREQUAL "DOCONLY")
    libyang_doc()
    return()
endif()

if(("${BUILD_TYPE_UPPER}" STREQUAL "DEBUG") OR ("${BUILD_TYPE_UPPER}" STREQUAL "RELWITHDEBINFO"))
    option(ENABLE_BUILD_TESTS "Build tests" ON)
    option(ENABLE_VALGRIND_TESTS "Build tests with valgrind" ON)
    # TODO enable when the internal docs ready
    set(INTERNAL_DOCS NO)
else()
    option(ENABLE_BUILD_TESTS "Build tests" OFF)
    option(ENABLE_VALGRIND_TESTS "Build tests with valgrind" OFF)
    set(INTERNAL_DOCS NO)
endif()
option(ENABLE_COVERAGE "Build code coverage report from tests" OFF)
option(ENABLE_FUZZ_TARGETS "Build target programs suitable for fuzzing with AFL" OFF)

set(LYD_VALUE_SIZE "24" CACHE STRING "Maximum size in bytes of data node values that do not need to be allocated dynamically, minimum is 8")
if(NOT LYD_VALUE_SIZE GREATER_EQUAL 8)
    message(FATAL_ERROR "Data node value size \"${LYD_VALUE_SIZE}\" is not valid.")
endif()
set(PLUGINS_DIR "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/libyang" CACHE STRING "Directory with libyang plugins (extensions and user types)")
set(PLUGINS_DIR_EXTENSIONS "${PLUGINS_DIR}/extensions" CACHE STRING "Directory with libyang user extensions plugins")
set(PLUGINS_DIR_TYPES "${PLUGINS_DIR}/types" CACHE STRING "Directory with libyang user types plugins")

if(ENABLE_COVERAGE)
    if(NOT ENABLE_BUILD_TESTS)
        message(WARNING "you cannot generage coverage when tests are disabled. Enable test by additing parameter -DENABLE_BUILD_TESTS=ON or run cmake in some debug mode")
        set(ENABLE_COVERAGE OFF)
    endif()

    find_program(PATH_GCOV NAMES gcov)
    if(NOT PATH_GCOV)
        message(WARNING "'gcov' executable not found! Disabling building code coverage report.")
        set(ENABLE_COVERAGE OFF)
    endif()

    find_program(PATH_LCOV NAMES lcov)
    if(NOT PATH_LCOV)
        message(WARNING "'lcov' executable not found! Disabling building code coverage report.")
        set(ENABLE_COVERAGE OFF)
    endif()

    find_program(PATH_GENHTML NAMES genhtml)
    if(NOT PATH_GENHTML)
        message(WARNING "'genhtml' executable not found! Disabling building code coverage report.")
        set(ENABLE_COVERAGE OFF)
    endif()

    if(NOT CMAKE_COMPILER_IS_GNUCC)
        message(WARNING "Compiler is not gcc! Coverage may break the tests!")
    endif()

    if(ENABLE_COVERAGE)
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --coverage -fprofile-arcs -ftest-coverage")
    endif()
endif()

# by default build shared library
# static build requires static libpcre2 library
option(ENABLE_STATIC "Build static (.a) library" OFF)

# generate files
configure_file(${PROJECT_SOURCE_DIR}/src/config.h.in ${PROJECT_BINARY_DIR}/src/config.h @ONLY)
configure_file(${PROJECT_SOURCE_DIR}/src/version.h.in ${PROJECT_BINARY_DIR}/src/version.h @ONLY)

#
# targets
#

# link compat
use_compat()

# create static libyang library
if(ENABLE_STATIC)
    add_definitions(-DSTATIC)
    set(CMAKE_EXE_LINKER_FLAGS -static)
    set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
    set(CMAKE_EXE_LINK_DYNAMIC_C_FLAGS)       # remove -Wl,-Bdynamic
    set(CMAKE_EXE_LINK_DYNAMIC_CXX_FLAGS)
    add_library(yang STATIC ${libsrc} ${compatsrc})
else()
    set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
    add_library(yangobj OBJECT ${libsrc} ${compatsrc})
    add_library(yang SHARED $<TARGET_OBJECTS:yangobj>)

    #link dl
    target_link_libraries(yang ${CMAKE_DL_LIBS})

    set_target_properties(yangobj PROPERTIES COMPILE_FLAGS "-fvisibility=hidden")
endif()

set_target_properties(yang PROPERTIES VERSION ${LIBYANG_SOVERSION_FULL} SOVERSION ${LIBYANG_SOVERSION})

# link math
target_link_libraries(yang m)

# find pthreads
set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
find_package(Threads REQUIRED)
if(ENABLE_STATIC)
    target_link_libraries(yang -Wl,--whole-archive ${CMAKE_THREAD_LIBS_INIT} -Wl,--no-whole-archive)
else()
    target_link_libraries(yang ${CMAKE_THREAD_LIBS_INIT})
endif()

# find PCRE2 library
unset(PCRE2_LIBRARY CACHE)
find_package(PCRE2 10.21 REQUIRED)
include_directories(${PCRE2_INCLUDE_DIRS})
target_link_libraries(yang ${PCRE2_LIBRARIES})

# generated header list
foreach(h IN LISTS gen_headers)
    list(APPEND g_headers ${PROJECT_BINARY_DIR}/${h})
endforeach()

# install all library files
install(TARGETS yang DESTINATION ${CMAKE_INSTALL_LIBDIR})
install(FILES ${headers} ${g_headers} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/libyang)

find_package(PkgConfig)
if(PKG_CONFIG_FOUND)
    # generate and install pkg-config file
    configure_file("libyang.pc.in" "libyang.pc" @ONLY)
    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/libyang.pc" DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
    # check that pkg-config includes the used path
    execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --variable pc_path pkg-config RESULT_VARIABLE RETURN OUTPUT_VARIABLE PC_PATH ERROR_QUIET)
    if(RETURN EQUAL 0)
	string(STRIP "${PC_PATH}" PC_PATH)
	set(PC_PATH "${PC_PATH}:$ENV{PKG_CONFIG_PATH}")
        string(REGEX MATCH "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/pkgconfig" SUBSTR "${PC_PATH}")
        string(LENGTH "${SUBSTR}" SUBSTR_LEN)
        if(SUBSTR_LEN EQUAL 0)
            message(WARNING "pkg-config will not detect the new package after installation, adjust PKG_CONFIG_PATH using \"export PKG_CONFIG_PATH=\${PKG_CONFIG_PATH}:${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/pkgconfig\".")
        endif()
    endif()
endif()

if(ENABLE_BUILD_TESTS)
    find_package(CMocka 1.0.0)
endif(ENABLE_BUILD_TESTS)

if ("${BUILD_TYPE_UPPER}" STREQUAL "DEBUG")
    # enable before adding tests to let them detect that format checking is available - one of the tests is format checking
    source_format_enable()
endif()

# tests
if(ENABLE_VALGRIND_TESTS)
    set(ENABLE_BUILD_TESTS ON)
endif()

if(ENABLE_BUILD_TESTS)
    if(CMOCKA_FOUND)
        enable_testing()
        add_subdirectory(tests)
    else()
        message(STATUS "Disabling tests because of missing CMocka")
        set(ENABLE_BUILD_TESTS OFF)
    endif()
endif()

if(ENABLE_FUZZ_TARGETS)
    set(FUZZER "AFL" CACHE STRING "fuzzer type")
    if(FUZZER STREQUAL "LibFuzzer")
        if (NOT CMAKE_C_COMPILER_ID STREQUAL "Clang")
            message(FATAL_ERROR "LibFuzzer works only with clang")
        endif()
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address,undefined -fno-omit-frame-pointer")
    endif()
endif()

# tools - yanglint, yangre
add_subdirectory(tools)

# generate doxygen documentation for libyang API
libyang_doc()

# generate API/ABI report
if ("${BUILD_TYPE_UPPER}" STREQUAL "ABICHECK")
    libyang_abicheck()
endif()

# source code format target for Makefile
# - add it after tests which may also update list of sources to format
source_format(${format_sources})

# clean cmake cache
add_custom_target(cclean
        COMMAND make clean
        COMMAND find . -iname '*cmake*' -not -name CMakeLists.txt -not -path './CMakeModules*' -exec rm -rf {} +
        COMMAND rm -rf Makefile Doxyfile
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})