make omemo frankenshtein

--- a/plugins/generic/omemoplugin/CMakeLists.txt
+++ b/plugins/generic/omemoplugin/CMakeLists.txt
@@ -36,11 +36,25 @@ endif()
 find_package(Qt${QT_DEFAULT_MAJOR_VERSION} COMPONENTS Network Widgets Xml Sql REQUIRED)
 find_package(OpenSSL COMPONENTS Crypto REQUIRED)
 #find_package(SignalProtocolC REQUIRED)
-find_package(OMEMO_C REQUIRED)
-if(WIN32)
-    find_package(PROTOBUF_C REQUIRED)
+if(EXISTS "${CMAKE_TOOLCHAIN_FILE}")
+    string(TOLOWER ${CMAKE_TOOLCHAIN_FILE} TOOLCHAIN_FILE)
+    string(REGEX MATCH "mxe-conf" MXE_DETECTED "${TOOLCHAIN_FILE}")
+    if(MXE_DETECTED)
+        set(USE_MXE ON)
+        set(WIN32 ON)
+    endif()
+endif()
+if(NOT WIN32 OR (NOT USE_MXE))
+    find_package(OMEMO_C REQUIRED)
+else()
+    #set(BUNDLED_OMEMO_C ON)
+    #find_package(PROTOBUF_C REQUIRED)
+    include(cmake/protobuf_c.cmake)
+    set(PBC_LIB ${PROTOBUF_C_LIBRARY})
+    include(cmake/omemo_c.cmake)
 endif()

+
 include_directories(
     ${PLUGINS_ROOT_DIR}/include
     ${OPENSSL_INCLUDE_DIR}
@@ -99,6 +113,7 @@ target_link_libraries(
 )

 if(WIN32)
+    add_dependencies(${PLUGIN} ProtobufCProject OmemoCProject)
     target_link_libraries(${PLUGIN}
         ${PROTOBUF_C_LIBRARY}
     )
--- /dev/null
+++ b/plugins/generic/omemoplugin/cmake/omemo_c.cmake
+cmake_minimum_required(VERSION 3.10.0)
+
+set(OmemoCGitRepo "https://github.com/dino/libomemo-c.git")
+
+message(STATUS "OMEMO_C: using bundled")
+set(OMEMO_C_PREFIX ${CMAKE_CURRENT_BINARY_DIR}/omemo-c)
+set(OMEMO_C_BUILD_DIR ${OMEMO_C_PREFIX}/build)
+set(OMEMO_C_INCLUDE_DIR ${OMEMO_C_PREFIX}/src/OmemoCProject/src)
+set(OMEMO_C_LIBRARY ${OMEMO_C_BUILD_DIR}/omemo-c/${CMAKE_STATIC_LIBRARY_PREFIX}omemo-c${D}${CMAKE_STATIC_LIBRARY_SUFFIX})
+if(APPLE)
+    set(COREFOUNDATION_LIBRARY "-framework CoreFoundation")
+    set(COREFOUNDATION_LIBRARY_SECURITY "-framework Security")
+    list(APPEND OMEMO_C_LIBRARY ${COREFOUNDATION_LIBRARY} ${COREFOUNDATION_LIBRARY_SECURITY})
+endif()
+
+set(patch_command
+    ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_CURRENT_SOURCE_DIR}/cmake/omemo-c.patch <SOURCE_DIR> &&
+    ${GIT_EXECUTABLE} checkout <SOURCE_DIR>/src/CMakeLists.txt &&
+    ${GIT_EXECUTABLE} apply <SOURCE_DIR>/omemo-c.patch)
+
+include(ExternalProject)
+#set CMake options and transfer the environment to an external project
+set(OMEMO_C_BUILD_OPTIONS
+    -DBUILD_SHARED_LIBS=OFF
+    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+    -DCMAKE_INSTALL_PREFIX=${OMEMO_C_PREFIX}/build
+    -DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}
+    -DPROTOBUF_C_INCLUDE_DIR=${PROTOBUF_C_INCLUDE_DIR}
+    -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
+    -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
+    -DOSX_FRAMEWORK=OFF)
+include(FindGit)
+find_package(Git REQUIRED)
+ExternalProject_Add(OmemoCProject
+    PREFIX ${OMEMO_C_PREFIX}
+    BINARY_DIR ${OMEMO_C_BUILD_DIR}
+    GIT_REPOSITORY "${OmemoCGitRepo}"
+    GIT_TAG omemo
+    CMAKE_ARGS ${OMEMO_C_BUILD_OPTIONS}
+    BUILD_BYPRODUCTS ${OMEMO_C_LIBRARY}
+    PATCH_COMMAND ${patch_command}
+    INSTALL_COMMAND ""
+    UPDATE_COMMAND ""
+    DEPENDS ProtobufCProject
+)
--- /dev/null
+++ b/plugins/generic/omemoplugin/cmake/protobuf_c.cmake
+cmake_minimum_required(VERSION 3.10.0)
+
+set(ProtobufCGitRepo "https://github.com/protobuf-c/protobuf-c.git")
+
+message(STATUS "PROTOBUF: using bundled")
+set(PROTOBUF_C_PREFIX ${CMAKE_CURRENT_BINARY_DIR}/protobuf-c)
+set(PROTOBUF_C_BUILD_DIR ${PROTOBUF_C_PREFIX}/build)
+set(PROTOBUF_C_INCLUDE_DIR ${PROTOBUF_C_PREFIX}/src/ProtobufCProject)
+set(PROTOBUF_C_SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/protobuf-c/src/ProtobufCProject/build-cmake)
+set(PROTOBUF_C_LIBRARY ${PROTOBUF_C_BUILD_DIR}/protobuf-c/${CMAKE_STATIC_LIBRARY_PREFIX}protobuf-c${D}${CMAKE_STATIC_LIBRARY_SUFFIX})
+if(APPLE)
+    set(COREFOUNDATION_LIBRARY "-framework CoreFoundation")
+    set(COREFOUNDATION_LIBRARY_SECURITY "-framework Security")
+    list(APPEND PROTOBUF_C_LIBRARY ${COREFOUNDATION_LIBRARY} ${COREFOUNDATION_LIBRARY_SECURITY})
+endif()
+
+include(ExternalProject)
+#set CMake options and transfer the environment to an external project
+
+set(PROTOBUF_C_BUILD_OPTIONS
+    -DCMAKE_IGNORE_PATH="/usr/include/protobuf-c"
+    -DCMAKE_SYSTEM_IGNORE_PATH="/usr/include/protobuf-c"
+    -DBUILD_SHARED_LIBS=OFF
+    -DBUILD_PROTOC=OFF
+    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+    -DCMAKE_INSTALL_PREFIX=${PROTOBUF_C_PREFIX}/build
+    -DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}
+    #-DPROTOBUF_C_ROOT_DIR=${PROTOBUF_C_ROOT_DIR}
+    -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
+    -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
+    -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    -DOSX_FRAMEWORK=OFF
+)
+
+include(FindGit)
+find_package(Git REQUIRED)
+ExternalProject_Add(ProtobufCProject
+    PREFIX ${PROTOBUF_C_PREFIX}
+    BINARY_DIR ${PROTOBUF_C_BUILD_DIR}
+    GIT_REPOSITORY "${ProtobufCGitRepo}"
+    CONFIGURE_COMMAND ${CMAKE_COMMAND} -G${CMAKE_GENERATOR} ${PROTOBUF_C_BUILD_OPTIONS} ${PROTOBUF_C_SOURCE_DIR}
+    CMAKE_ARGS ${PROTOBUF_C_BUILD_OPTIONS}
+    BUILD_BYPRODUCTS ${PROTOBUF_C_LIBRARY}
+    INSTALL_COMMAND ""
+    UPDATE_COMMAND ""
+)