# FindPopplerQt6.cmake - Find Poppler Qt6 bindings
# Sets: POPPLER_QT6_INCLUDE_DIR, POPPLER_QT6_LIBRARY, PopplerQt6::Poppler target

if(POPPLER_QT6_INCLUDE_DIR AND POPPLER_QT6_LIBRARY)
  set(POPPLER_QT6_FOUND TRUE)
else()
  set(_poppler_version_bad FALSE)

  if(NOT WIN32)
    include(FindPkgConfig)
    # Prefer poppler-qt6
    pkg_check_modules(_pc_poppler poppler-qt6)
    if(_pc_poppler_FOUND)
      set(_pc_poppler_pkgname poppler-qt6)
      if(NOT "${_pc_poppler_VERSION}" VERSION_GREATER 0.24.0)
        set(_poppler_version_bad TRUE)
      endif()
    endif()
  endif()

  if(NOT _poppler_version_bad)
    set(POPPLER_QT6_FOUND FALSE)

    # Try library name discovered by pkg-config
    if(_pc_poppler_FOUND)
      set(_pkg_var "pkgcfg_lib__pc_poppler_${_pc_poppler_pkgname}")
      message(STATUS "FindPoppler: pkg-config found ${_pc_poppler_pkgname}, var ${_pkg_var} defined? ${${_pkg_var}}")
      if(DEFINED ${_pkg_var})
        set(POPPLER_QT6_LIBRARY ${${_pkg_var}})
        message(STATUS "FindPoppler: using pkgcfg path ${POPPLER_QT6_LIBRARY}")
      endif()
    endif()
    
    if(NOT POPPLER_QT6_LIBRARY)
      find_library(POPPLER_QT6_LIBRARY ${_pc_poppler_pkgname}
                   HINTS ${_pc_poppler_LIBRARY_DIRS}
      )
    endif()
    
    # Fallback: try common library names
    if(NOT POPPLER_QT6_LIBRARY)
      find_library(POPPLER_QT6_LIBRARY NAMES poppler-qt6 poppler-qt6)
    endif()
    
    # Extra fallback paths
    if(NOT POPPLER_QT6_LIBRARY)
      find_library(POPPLER_QT6_LIBRARY NAMES poppler-qt6 poppler-qt6 
                   PATHS /usr/lib/x86_64-linux-gnu /usr/lib /usr/local/lib)
    endif()

    # Check for headers (Qt6 layout: poppler/qt6/poppler-qt6.h)
    find_path(POPPLER_QT6_INCLUDE_DIR poppler/qt6/poppler-qt6.h
              HINTS ${_pc_poppler_INCLUDE_DIRS}
              PATH_SUFFIXES poppler
    )

    if(POPPLER_QT6_LIBRARY AND POPPLER_QT6_INCLUDE_DIR)
      set(POPPLER_QT6_FOUND TRUE)
      
      # Expose a modern imported target for consumers
      if(NOT TARGET PopplerQt6::Poppler)
        add_library(PopplerQt6::Poppler UNKNOWN IMPORTED)
        set_target_properties(PopplerQt6::Poppler PROPERTIES
          IMPORTED_LOCATION "${POPPLER_QT6_LIBRARY}"
          INTERFACE_INCLUDE_DIRECTORIES "${POPPLER_QT6_INCLUDE_DIR}"
        )
      endif()
      
      # Cache the variables
      set(POPPLER_QT6_LIBRARY "${POPPLER_QT6_LIBRARY}" CACHE FILEPATH "Path to poppler-qt6 library")
      set(POPPLER_QT6_INCLUDE_DIR "${POPPLER_QT6_INCLUDE_DIR}" CACHE PATH "Poppler-Qt6 include dirs")
    endif()
  endif()

  if(POPPLER_QT6_LIBRARY AND POPPLER_QT6_INCLUDE_DIR)
    include(FindPackageHandleStandardArgs)
    find_package_handle_standard_args(PopplerQt6 DEFAULT_MSG
                                      POPPLER_QT6_LIBRARY
                                      POPPLER_QT6_INCLUDE_DIR)
  else()
    message(WARNING "Poppler Qt6 bindings not found. Creating placeholder PopplerQt6::Poppler target.")
    set(POPPLER_QT6_LIBRARY "" CACHE STRING "Placeholder poppler library" FORCE)
    set(POPPLER_QT6_INCLUDE_DIR "" CACHE STRING "Placeholder poppler include dir" FORCE)
    if(NOT TARGET PopplerQt6::Poppler)
      add_library(PopplerQt6::Poppler UNKNOWN IMPORTED)
      set_property(TARGET PopplerQt6::Poppler PROPERTY INTERFACE_INCLUDE_DIRECTORIES "")
    endif()
    set(POPPLER_QT6_FOUND TRUE CACHE INTERNAL "Poppler placeholder present")
  endif()
endif()