# This is a modified version of the file written by Hedrik Sattler,
# from the OpenOBEX project (licensed GPLv2/LGPL).  (If this is not correct,
# please contact us so we can attribute the author appropriately.)
#
# https://github.com/zuckschwerdt/openobex/blob/master/CMakeModules/FindLibUSB.cmake
# http://dev.zuckschwerdt.org/openobex/
#
# Find libusb-1.0
#
# It will use PkgConfig if present and supported, otherwise this
# script searches for binary distribution in the path defined by
# the LIBUSB_PATH variable.
#
# Define LIBUSB_SKIP_VERSION_CHECK=Yes to skip the execution of a program to fetch
# libusb's version number. LIBUSB_VERSION will not be set if this if this is used.
# To check the version number, this script expects CMAKE_HELPERS_SOURCE_DIR to
# be defined with the path to libusb_version.c.
#
# The following standard variables get defined:
#  LIBUSB_FOUND:            true if LibUSB was found
#  LIBUSB_HEADER_FILE:      the location of the C header file
#  LIBUSB_INCLUDE_DIRS:     the directorys that contain headers
#  LIBUSB_LIBRARIES:        the library files
#  LIBUSB_VERSION           the detected libusb version
#  LIBUSB_HAVE_GET_VERSION  True if libusb has libusb_get_version()

if(DEFINED __INCLUDED_BLADERF_FINDLIBUSB_CMAKE)
    return()
endif()
set(__INCLUDED_BLADERF_FINDLIBUSB_CMAKE TRUE)

include(CheckLibraryExists)
include(CheckIncludeFile)


# In Linux, folks should generally be able to simply fetch the libusb library and
# development packages from their distros package repository. Windows users will
# likely want to fetch a binary distribution, hence the Windows-oriented default.
#
# See http://www.libusb.org/wiki/windows_backend#LatestBinarySnapshots
if(WIN32)
    set(LIBUSB_PATH
        "C:/Program Files/libusb-1.0.19"
        CACHE
        PATH
        "Path to libusb files. (This is generally only needed for Windows users who downloaded binary distributions.)"
       )
endif()

find_package(PkgConfig)
if(PKG_CONFIG_FOUND)
    pkg_check_modules(PKGCONFIG_LIBUSB libusb-1.0 QUIET)
endif(PKG_CONFIG_FOUND)

if(PKGCONFIG_LIBUSB_FOUND)
    set(LIBUSB_INCLUDE_DIRS ${PKGCONFIG_LIBUSB_INCLUDE_DIRS})
    foreach(i ${PKGCONFIG_LIBUSB_LIBRARIES})
        string(REGEX MATCH "[^-]*" ibase "${i}")
        find_library(${ibase}_LIBRARY
            NAMES ${i}
            PATHS ${PKGCONFIG_LIBUSB_LIBRARY_DIRS}
           )
        if(${ibase}_LIBRARY)
            list(APPEND LIBUSB_LIBRARIES ${${ibase}_LIBRARY})
        endif(${ibase}_LIBRARY)
        mark_as_advanced(${ibase}_LIBRARY)
    endforeach(i)

else(PKGCONFIG_LIBUSB_FOUND)
    if(${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
        # The libusbx binary distribution contains several libs.
        # Use the lib that got compiled with the same compiler.
        if(MSVC)
            if(CMAKE_CL_64)
                set(LIBUSB_LIBRARY_PATH_SUFFIX MS64/dll)
            else(CMAKE_CL_64)
                set(LIBUSB_LIBRARY_PATH_SUFFIX MS32/dll)
            endif(CMAKE_CL_64)
        elseif(CMAKE_COMPILER_IS_GNUCC)
            if(CMAKE_SIZEOF_VOID_P EQUAL 8)
                set(LIBUSB_LIBRARY_PATH_SUFFIX MinGW32/dll)
            else(CMAKE_SIZEOF_VOID_P EQUAL 8)
                set(LIBUSB_LIBRARY_PATH_SUFFIX MinGW64/dll)
            endif(CMAKE_SIZEOF_VOID_P EQUAL 8)
        endif(MSVC)
    else()
        set(LIBUSB_LIBRARY_PATH_SUFFIX lib)
        set(LIBUSB_EXTRA_PATHS /usr /usr/local /opt/local)
    endif(${CMAKE_SYSTEM_NAME} STREQUAL "Windows")

    find_file(LIBUSB_HEADER_FILE
        NAMES
        libusb.h
        PATHS
        ${LIBUSB_PATH}
        ${LIBUSB_EXTRA_PATHS}
        PATH_SUFFIXES
        include include/libusbx-1.0 include/libusb-1.0
       )
    mark_as_advanced(LIBUSB_HEADER_FILE)
    get_filename_component(LIBUSB_INCLUDE_DIRS "${LIBUSB_HEADER_FILE}" PATH)


    find_library(usb_LIBRARY
        NAMES
        libusb-1.0 usb-1.0
        PATHS
        ${LIBUSB_PATH}
        ${LIBUSB_EXTRA_PATHS}
        PATH_SUFFIXES
        ${LIBUSB_LIBRARY_PATH_SUFFIX}
       )
    mark_as_advanced(usb_LIBRARY)
    if(usb_LIBRARY)
        set(LIBUSB_LIBRARIES ${usb_LIBRARY})
    endif(usb_LIBRARY)

endif(PKGCONFIG_LIBUSB_FOUND)

if(LIBUSB_INCLUDE_DIRS AND LIBUSB_LIBRARIES)
    set(LIBUSB_FOUND true)
endif(LIBUSB_INCLUDE_DIRS AND LIBUSB_LIBRARIES)

if(LIBUSB_FOUND)
    set(CMAKE_REQUIRED_INCLUDES "${LIBUSB_INCLUDE_DIRS}")
    check_include_file("{LIBUSB_HEADER_FILE}" LIBUSB_FOUND)
endif(LIBUSB_FOUND)

if(LIBUSB_FOUND AND NOT CMAKE_CROSSCOMPILING)
    if(LIBUSB_SKIP_VERSION_CHECK)
        message(STATUS "Skipping libusb version number check.")
        unset(LIBUSB_VERSION)
    else()
        message(STATUS "Checking libusb version...")

        if(WIN32)
            string(REPLACE ".lib" ".dll" LIBUSB_DLL "${LIBUSB_LIBRARIES}")
            try_run(LIBUSB_VERCHECK_RUN_RESULT
                    LIBUSB_VERCHECK_COMPILED
                    ${CMAKE_HELPERS_BINARY_DIR}
                    ${CMAKE_HELPERS_SOURCE_DIR}/libusb_version.c
                    CMAKE_FLAGS "-DINCLUDE_DIRECTORIES=${LIBUSB_INCLUDE_DIRS}"
                    RUN_OUTPUT_VARIABLE LIBUSB_VERSION
                    ARGS "\"${LIBUSB_DLL}\""
            )
        else()
            try_run(LIBUSB_VERCHECK_RUN_RESULT
                    LIBUSB_VERCHECK_COMPILED
                    ${CMAKE_HELPERS_BINARY_DIR}
                    ${CMAKE_HELPERS_SOURCE_DIR}/libusb_version.c
                    CMAKE_FLAGS "-DINCLUDE_DIRECTORIES=${LIBUSB_INCLUDE_DIRS}" "-DLINK_LIBRARIES=${LIBUSB_LIBRARIES}"
                    RUN_OUTPUT_VARIABLE LIBUSB_VERSION
            )
        endif()


        if (NOT LIBUSB_VERCHECK_COMPILED OR NOT LIBUSB_VERCHECK_RUN_RESULT EQUAL 0 )
            message(STATUS "${LIBUSB_VERSION}")
            set(LIBUSB_VERSION "0.0.0")
            message(WARNING "\nFailed to compile (compiled=${LIBUSB_VERCHECK_COMPILED}) or run (retval=${LIBUSB_VERCHECK_RUN_RESULT}) libusb version check.\n"
                             "This may occur if libusb is earlier than v1.0.10.\n"
                             "Setting LIBUSB_VERSION to ${LIBUSB_VERSION}.\n")
            return()
        endif()

        message(STATUS "libusb version: ${LIBUSB_VERSION}")
    endif()
endif(LIBUSB_FOUND AND NOT CMAKE_CROSSCOMPILING)
