#
# Builds the paho.mqtt.cpp library
#
# Outputs the following target:
#   paho-mqttpp3
#
# When depending on paho-mqttp3, must also depend on
# either paho-mqttc3::MQTTClient or paho-mqttc3::MQTTAsync
# for using the blocking or the asynchrounous client, respectively.
#
include(ExternalProject)
set(PAHOMQTTCPP_DIR ${CMAKE_SOURCE_DIR}/modules/paho.mqtt.cpp)
set(PAHOMQTTCPP_TARGET_DIR ${CMAKE_BINARY_DIR}/modules/paho.mqtt.cpp)

if( WIN32)
  set(PAHOMQTTCPP_STATIC_LIB ${PAHOMQTTCPP_TARGET_DIR}/lib/paho-mqttpp3-static.lib)
else()
  set(PAHOMQTTCPP_STATIC_LIB ${PAHOMQTTCPP_TARGET_DIR}/lib/libpaho-mqttpp3.a)
endif()

set(PAHOMQTTCPP_BYPRODUCTS ${PAHOMQTTCPP_STATIC_LIB})

file(MAKE_DIRECTORY ${PAHOMQTTCPP_TARGET_DIR}/include)

set(PAHO_BUILD_SHARED FALSE)
if(NOT ${PAHO_BUILD_STATIC})
  set(PAHO_BUILD_SHARED TRUE)
endif()

ExternalProject_Add(
    pahomqttcpp
    DEPENDS pahomqttc
    PREFIX ${PAHOMQTTCPP_TARGET_DIR}
    SOURCE_DIR ${PAHOMQTTCPP_DIR}
    CMAKE_ARGS -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
    CMAKE_ARGS -DCMAKE_PROJECT_paho-mqtt-cpp_INCLUDE=${CMAKE_BINARY_DIR}/cmake/fix_pahomqttcpp.cmake
    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PAHOMQTTCPP_TARGET_DIR}
    CMAKE_ARGS -DPAHO_WITH_SSL=${PAHO_BUILD_WITH_SSL}
    CMAKE_ARGS -DPAHO_BUILD_STATIC=${PAHO_BUILD_STATIC}
    CMAKE_ARGS -DPAHO_BUILD_SHARED=${PAHO_BUILD_SHARED}
    BUILD_COMMAND cmake --build . --config $<CONFIG>
    INSTALL_COMMAND cmake --install . --config $<CONFIG>
    BUILD_BYPRODUCTS ${PAHOMQTTCPP_BYPRODUCTS}
)

add_library(paho-mqttpp3 STATIC IMPORTED GLOBAL)

add_dependencies(paho-mqttpp3 pahomqttcpp)

set_target_properties(paho-mqttpp3 PROPERTIES
    IMPORTED_LOCATION ${PAHOMQTTCPP_STATIC_LIB}
    INTERFACE_INCLUDE_DIRECTORIES ${PAHOMQTTCPP_TARGET_DIR}/include)