include(ExternalProject)

# This function is used to force a build on a dependant project at cmake configuration phase.
#
function (build_external_project target prefix url) #FOLLOWING ARGUMENTS are the CMAKE_ARGS of ExternalProject_Add

    set(trigger_build_dir ${CMAKE_BINARY_DIR}/force_${target})

    #mktemp dir in build tree
    file(MAKE_DIRECTORY ${trigger_build_dir} ${trigger_build_dir}/build)

    #generate false dependency project
    set(CMAKE_LIST_CONTENT "
        cmake_minimum_required(VERSION 2.8)

        include(ExternalProject)
        ExternalProject_add(${target}
            PREFIX ${prefix}/${target}
            GIT_REPOSITORY ${url}
            CMAKE_ARGS ${ARGN}
            INSTALL_COMMAND \"\"
            )

        add_custom_target(trigger_${target})
        add_dependencies(trigger_${target} ${target})
    ")

    file(WRITE ${trigger_build_dir}/CMakeLists.txt "${CMAKE_LIST_CONTENT}")

    execute_process(COMMAND ${CMAKE_COMMAND} -G${CMAKE_GENERATOR} ..
        WORKING_DIRECTORY ${trigger_build_dir}/build
        )
    execute_process(COMMAND ${CMAKE_COMMAND} --build .
        WORKING_DIRECTORY ${trigger_build_dir}/build
        )
    execute_process(COMMAND ${CMAKE_COMMAND} --build . --target install
        WORKING_DIRECTORY ${trigger_build_dir}/build/${prefix}/${target}/src/${target}-build
        )

endfunction()

SET(_BOOST_COMPONENTS program_options system filesystem thread)
hunter_add_package(Boost COMPONENTS ${_BOOST_COMPONENTS})
find_package(Boost CONFIG REQUIRED ${_BOOST_COMPONENTS})

hunter_add_package(nlohmann_json)
find_package(nlohmann_json CONFIG REQUIRED)

hunter_add_package(GTest)
find_package(GMock CONFIG REQUIRED)

hunter_add_package(benchmark)
find_package(benchmark CONFIG REQUIRED)

hunter_add_package(spdlog)
find_package(spdlog CONFIG REQUIRED)

hunter_add_package(range-v3)
find_package(range-v3 CONFIG REQUIRED)

#hunter_add_package(PostgreSQL)
#find_package(PostgreSQL REQUIRED)

set(EXTERNAL_INSTALL_LOCATION ${CMAKE_BINARY_DIR}/lib CACHE STRING "external libs root path")
set(EXTERNAL_LOCATION ${CMAKE_BINARY_DIR}/external CACHE STRING "external sources root path")
set(_HUNTER_ROOT "${Boost_DIR}/../../../")

message("HUNTER ROOT DIRECTORY ${_HUNTER_ROOT}")

build_external_project(project_wt wt
    https://github.com/emweb/wt.git
      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
      -DCMAKE_INSTALL_PREFIX=${EXTERNAL_LOCATION}
#      -DSHARED_LIBS:BOOL=OFF
      -DBoost_NO_BOOST_CMAKE=TRUE
      -DBoost_NO_SYSTEM_PATHS=TRUE
      -DBOOST_ROOT:PATHNAME=${_HUNTER_ROOT}
      -DBOOST_INCLUDEDIR:FILEPATH=${_HUNTER_ROOT}/include
      -DBOOST_LIBRARYDIR:FILEPATH=${_HUNTER_ROOT}/lib
#      -DBoost_USE_STATIC_LIBS=TRUE
      -DBUILD_EXAMPLES=OFF
      -DINSTALL_RESOURCES=OFF
      -DENABLE_SSL=OFF
      -DENABLE_HARU=OFF
      -DENABLE_PANGO=OFF
      -DENABLE_SQLITE=OFF
      -DENABLE_POSTGRES=OFF
      -DENABLE_FIREBIRD=OFF
      -DENABLE_MYSQL=OFF
      -DENABLE_MSSQLSERVER=OFF
      -DENABLE_QT4=OFF
      -DENABLE_LIBWTDBO=OFF
      -DENABLE_OPENGL=OFF
      -DENABLE_UNWIND=OFF
      -DCONNECTOR_FCGI=OFF
)

add_library(wt SHARED IMPORTED)
set_target_properties(wt PROPERTIES IMPORTED_LOCATION ${EXTERNAL_LOCATION}/lib/libwt.so)
add_dependencies(wt project_wt)

add_library(wthttp SHARED IMPORTED)
set_target_properties(wthttp PROPERTIES IMPORTED_LOCATION ${EXTERNAL_LOCATION}/lib/libwthttp.so)
add_dependencies(wthttp project_wt)

LIST(APPEND CMAKE_MODULE_PATH "${EXTERNAL_LOCATION}")

build_external_project(project_hhdate date
    https://github.com/HowardHinnant/date.git
      -DCMAKE_INSTALL_PREFIX=${EXTERNAL_LOCATION}
      -DTZ_CXX_STANDARD=14
)

add_library(date INTERFACE IMPORTED)
add_dependencies(date project_hhdate)

build_external_project(project_sqlpp sqlpp
    https://github.com/rbock/sqlpp11.git
      -DCMAKE_INSTALL_PREFIX=${EXTERNAL_LOCATION}
      -DENABLE_TESTS=FALSE
)

add_library(sqlpp INTERFACE IMPORTED)
add_dependencies(sqlpp project_sqlpp)

link_directories(${_HUNTER_ROOT}/lib)

find_library(wt REQUIRED)
find_library(wthttp REQUIRED)
find_library(sqlpp REQUIRED)