include(vcpkg_common_functions)

string(LENGTH "${CURRENT_BUILDTREES_DIR}" BUILDTREES_PATH_LENGTH)
if(BUILDTREES_PATH_LENGTH GREATER 37 AND CMAKE_HOST_WIN32)
    message(WARNING "eigen3's buildsystem uses very long paths and may fail on your system.\n"
        "We recommend moving vcpkg to a short path such as 'C:\\src\\vcpkg' or using the subst command."
    )
endif()

vcpkg_from_github(
    OUT_SOURCE_PATH SOURCE_PATH
    REPO eigenteam/eigen-git-mirror
    REF 3.3.7
    SHA512 270ab9b5c22e09aa0e70d1a26995523c5c21fb0f09da45c137c11ab4c7700fe2bdb2b343c1e063bea4be5ae61d2313ff29ebbcad519dc355a568792b4a6e9e48
    HEAD_REF master
)

vcpkg_configure_cmake(
    SOURCE_PATH ${SOURCE_PATH}
    PREFER_NINJA
    OPTIONS
        -DBUILD_TESTING=OFF
    OPTIONS_RELEASE
        -DCMAKEPACKAGE_INSTALL_DIR=${CURRENT_PACKAGES_DIR}/share/eigen3
    OPTIONS_DEBUG
        -DCMAKEPACKAGE_INSTALL_DIR=${CURRENT_PACKAGES_DIR}/debug/share/eigen3
)

vcpkg_install_cmake()

file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug)

file(READ "${CURRENT_PACKAGES_DIR}/share/eigen3/Eigen3Targets.cmake" EIGEN_TARGETS)
string(REPLACE "set(_IMPORT_PREFIX " "get_filename_component(_IMPORT_PREFIX \"\${CMAKE_CURRENT_LIST_DIR}/../..\" ABSOLUTE) #" EIGEN_TARGETS "${EIGEN_TARGETS}")
file(WRITE "${CURRENT_PACKAGES_DIR}/share/eigen3/Eigen3Targets.cmake" "${EIGEN_TARGETS}")

file(GLOB INCLUDES ${CURRENT_PACKAGES_DIR}/include/eigen3/*)
# Copy the eigen header files to conventional location for user-wide MSBuild integration
file(COPY ${INCLUDES} DESTINATION ${CURRENT_PACKAGES_DIR}/include)

# Put the licence file where vcpkg expects it
file(COPY ${SOURCE_PATH}/COPYING.README DESTINATION ${CURRENT_PACKAGES_DIR}/share/eigen3)
file(RENAME ${CURRENT_PACKAGES_DIR}/share/eigen3/COPYING.README ${CURRENT_PACKAGES_DIR}/share/eigen3/copyright)