# We can't build glog with gflags, unless gflags is pre-installed.
# If build glog with pre-installed gflags, there will be conflict.

set(openfst_ROOT ${LIB_BASE_DIR}/openfst-src)
set(openfst_BUILD ${LIB_BASE_DIR}/openfst-build)
# We can't build glog with gflags, unless gflags is pre-installed.
# If build glog with pre-installed gflags, there will be conflict.
include(gflags)
if(TARGET gflags)
    message(STATUS "${BoldGreen}Find Package gflags: ${gflags_FOUND}${ColourReset}")
    set_target_properties(gflags PROPERTIES INTERFACE_COMPILE_OPTIONS "-fPIC")
endif()
set(WITH_GFLAGS OFF CACHE BOOL "whether build glog with gflags" FORCE)
include(glog)
execute_process(COMMAND rm -r ${openfst_BUILD})
if(NOT EXISTS ${openfst_BUILD})
    # 推荐手动去构建项目，不然这些代码因为环境不兼容等原因会执行不成功
    message(STATUS "${BoldGreen}Install openfst: ${GLOG_BUILD_DIR}${ColourReset}")

    execute_process(COMMAND mkdir ${openfst_BUILD})
    # patch补丁必须打，不然会报glog无法动态识别这个库的方法，导致链接不成功。
    execute_process(
            COMMAND cmake -E copy_directory ${CMAKE_CURRENT_SOURCE_DIR}/patch/openfst ${LIB_BASE_DIR}/openfst-src
            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
            RESULT_VARIABLE configure_result1)

    message(STATUS "${BoldGreen}configure openfst${ColourReset}")
    #./configure --prefix=${openfst_SOURCE_DIR}/build --enable-static --disable-shared --with-pic
    execute_process(
            COMMAND ./configure --prefix=${openfst_BUILD} --with-pic
            WORKING_DIRECTORY ${openfst_ROOT}
            RESULT_VARIABLE configure_result)
    message(FATAL_ERROR "${BoldRed}openfst项目构建不成功！${openfst_BUILD} ${ColourReset}")
    if(configure_result)
        message(FATAL_ERROR "${BoldRed}openfst项目构建不成功！ ${ColourReset}")
    endif ()
    message(STATUS "${BoldGreen}copy openfst patch done!${ColourReset}")
    execute_process(
            COMMAND cmake --build . --target install
            WORKING_DIRECTORY ${openfst_ROOT})
    execute_process(
            COMMAND cmake --install .
            WORKING_DIRECTORY ${openfst_ROOT})
endif()

# gflags和glog现在被我安装到了系统盘下/usr/lib/x86_64-linux-gnu

# 下面这堆关键字是防止cmake出一堆无关的提示
if(NOT GRAPH_TOOLS)
    set(HAVE_BIN OFF CACHE BOOL "Build the fst binaries" FORCE)
    set(HAVE_SCRIPT OFF CACHE BOOL "Build the fstscript" FORCE)
endif()
set(HAVE_COMPACT OFF CACHE BOOL "Build compact" FORCE)
set(HAVE_CONST OFF CACHE BOOL "Build const" FORCE)
set(HAVE_GRM OFF CACHE BOOL "Build grm" FORCE)
set(HAVE_FAR OFF CACHE BOOL "Build far" FORCE)
set(HAVE_PDT OFF CACHE BOOL "Build pdt" FORCE)
set(HAVE_MPDT OFF CACHE BOOL "Build mpdt" FORCE)
set(HAVE_LINEAR OFF CACHE BOOL "Build linear" FORCE)
set(HAVE_LOOKAHEAD OFF CACHE BOOL "Build lookahead" FORCE)
set(HAVE_NGRAM OFF CACHE BOOL "Build ngram" FORCE)
set(HAVE_SPECIAL OFF CACHE BOOL "Build special" FORCE)

include_directories(${openfst_ROOT}/src/include)

if (EXISTS ${openfst_BUILD}/src/lib/libfst.so)
    add_library(fst SHARED IMPORTED)
    set_property(TARGET fst PROPERTY IMPORTED_LOCATION ${openfst_BUILD}/src/lib/libfst.so)
    message(STATUS "${BoldGreen}Find Library libfst.so: ${openfst_BUILD}/src/lib/${ColourReset}")
else ()
    message(FATAL_ERROR "${BoldRed}Can't find openfst library from: ${openfst_BUILD}/src/lib ${ColourReset}")
endif ()

list(APPEND third_party_libraries fst gflags_nothreads_static glog dl)