cmake_minimum_required(VERSION 3.15)

include(FetchContent)

FetchContent_Declare(
  libQGLViewer
  URL http://www.libqglviewer.com/src/libQGLViewer-2.7.2.tar.gz
  URL_HASH MD5=a9d965d1ce41f7db6b34f440bb74f061
  CONFIGURE_COMMAND "qmake ${CMAKE_CURRENT_SOURCE_DIR}/QGLViewer/QGLViewer.pro"
  STEP_TARGETS build
  # BUILD_BYPRODUCTS ${CMAKE_CURRENT_SOURCE_DIR}/QGLViewer/libQGLViewer-qt5.so
  LOG_DOWNLOAD true
  LOG_CONFIGURE true
  LOG_BUILD true
  LOG_INSTALL true)

ExternalProject_Get_property(libQGLViewer_ep SOURCE_DIR)
message("libqglviewer_ep src dir: ${SOURCE_DIR}")
ExternalProject_Get_property(libQGLViewer_ep CONFIGURE_COMMAND)
message("libqglviewer_ep configure command: ${CONFIGURE_COMMAND}")
# ExternalProject_Get_property(libQGLViewer_ep BUILD_BYPRODUCTS)
# message("libqglviewer_ep build byproducts: ${BUILD_BYPRODUCTS}")

set(QGLVIEWER_INCLUDE_DIR
  $<BUILD_INTERFACE:${SOURCE_DIR}>
  $<INSTALL_INTERFACE:include>
  CACHE PATH "")
# # Can't use find_library as the library isn't there at config time
# find_library(QGLVIEWER_LIBRARIES
#   NAMES qglviewer-qt4 qglviewer QGLViewer QGLViewer2 QGLViewer-qt5
#   PATHS ${SOURCE_DIR}
#   PATH_SUFFIXES QGLViewer QGLViewer/release)
set(QGLVIEWER_LIBRARIES
  $<BUILD_INTERFACE:${SOURCE_DIR}/QGLViewer/libQGLViewer-qt5.so>
  $<INSTALL_INTERFACE:lib/libQGLViewer-qt5.so>
  CACHE FILEPATH "")

add_library(libQGLViewer INTERFACE)
target_link_libraries(libQGLViewer INTERFACE ${QGLVIEWER_LIBRARIES})
add_dependencies(libQGLViewer libQGLViewer_ep-build)
target_include_directories(libQGLViewer INTERFACE ${QGLVIEWER_INCLUDE_DIR})