# SPDX-FileCopyrightText: 2018 Christophe Giboudeaux <christophe@krop.fr>
# SPDX-FileCopyrightText: 2010 Alexander Neundorf <neundorf@kde.org>
# SPDX-FileCopyrightText: 2008 Gilles Caulier <caulier.gilles@gmail.com>
#
# SPDX-License-Identifier: BSD-3-Clause

#[=======================================================================[.rst:
FindLibExiv2
------------

Try to find the Exiv2 library.

This will define the following variables:

``LibExiv2_FOUND``
    True if (the requested version of) Exiv2 is available

``LibExiv2_VERSION``
    The version of Exiv2

``LibExiv2_INCLUDE_DIRS``
    The include dirs of Exiv2 for use with target_include_directories()

``LibExiv2_LIBRARIES``
    The Exiv2 library for use with target_link_libraries().
    This can be passed to target_link_libraries() instead of
    the ``LibExiv2::LibExiv2`` target

If ``LibExiv2_FOUND`` is TRUE, it will also define the following imported
target:

``LibExiv2::LibExiv2``
    The Exiv2 library

In general we recommend using the imported target, as it is easier to use.
Bear in mind, however, that if the target is in the link interface of an
exported library, it must be made available by the package config file.

Since 5.53.0.
#]=======================================================================]

cmake_policy(VERSION 3.16)

find_package(PkgConfig QUIET)
pkg_check_modules(PC_EXIV2 QUIET exiv2)

find_path(LibExiv2_INCLUDE_DIRS NAMES exiv2/exif.hpp
    HINTS ${PC_EXIV2_INCLUDEDIR}
)

find_library(LibExiv2_LIBRARIES NAMES exiv2 libexiv2
    HINTS ${PC_EXIV2_LIBRARY_DIRS}
)

set(LibExiv2_VERSION ${PC_EXIV2_VERSION})

if(NOT LibExiv2_VERSION AND DEFINED LibExiv2_INCLUDE_DIRS)
    # With exiv >= 0.27, the version #defines are in exv_conf.h instead of version.hpp
    foreach(_exiv2_version_file "version.hpp" "exv_conf.h")
        if(EXISTS "${LibExiv2_INCLUDE_DIRS}/exiv2/${_exiv2_version_file}")
            file(READ "${LibExiv2_INCLUDE_DIRS}/exiv2/${_exiv2_version_file}" _exiv_version_file_content)
            string(REGEX MATCH "#define EXIV2_MAJOR_VERSION[ ]+\\([0-9]+U?\\)" EXIV2_MAJOR_VERSION_MATCH ${_exiv_version_file_content})
            string(REGEX MATCH "#define EXIV2_MINOR_VERSION[ ]+\\([0-9]+U?\\)" EXIV2_MINOR_VERSION_MATCH ${_exiv_version_file_content})
            string(REGEX MATCH "#define EXIV2_PATCH_VERSION[ ]+\\([0-9]+U?\\)" EXIV2_PATCH_VERSION_MATCH ${_exiv_version_file_content})
            if(EXIV2_MAJOR_VERSION_MATCH)
                string(REGEX REPLACE ".*_MAJOR_VERSION[ ]+\\(([0-9]*)U?\\)" "\\1" EXIV2_MAJOR_VERSION ${EXIV2_MAJOR_VERSION_MATCH})
                string(REGEX REPLACE ".*_MINOR_VERSION[ ]+\\(([0-9]*)U?\\)" "\\1" EXIV2_MINOR_VERSION ${EXIV2_MINOR_VERSION_MATCH})
                string(REGEX REPLACE ".*_PATCH_VERSION[ ]+\\(([0-9]*)U?\\)" "\\1"  EXIV2_PATCH_VERSION  ${EXIV2_PATCH_VERSION_MATCH})
            endif()
        endif()
    endforeach()

    set(LibExiv2_VERSION "${EXIV2_MAJOR_VERSION}.${EXIV2_MINOR_VERSION}.${EXIV2_PATCH_VERSION}")
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(LibExiv2
    FOUND_VAR LibExiv2_FOUND
    REQUIRED_VARS  LibExiv2_LIBRARIES LibExiv2_INCLUDE_DIRS
    VERSION_VAR  LibExiv2_VERSION
)

mark_as_advanced(LibExiv2_INCLUDE_DIRS LibExiv2_LIBRARIES)

if(LibExiv2_FOUND AND NOT TARGET LibExiv2::LibExiv2)
    add_library(LibExiv2::LibExiv2 UNKNOWN IMPORTED)
    set_target_properties(LibExiv2::LibExiv2 PROPERTIES
        IMPORTED_LOCATION "${LibExiv2_LIBRARIES}"
        INTERFACE_INCLUDE_DIRECTORIES "${LibExiv2_INCLUDE_DIRS}"
    )
    if (LibExiv2_VERSION VERSION_LESS 0.28.0)
        # exiv2 0.27 or older still uses std::auto_ptr, which is no longer available
        # by default when using newer C++ versions
        set_target_properties(LibExiv2::LibExiv2 PROPERTIES
            INTERFACE_COMPILE_DEFINITIONS "_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR=1;_HAS_AUTO_PTR_ETC=1"
        )
    endif()
endif()

include(FeatureSummary)
set_package_properties(LibExiv2 PROPERTIES
    URL "https://www.exiv2.org"
    DESCRIPTION "Image metadata support"
)
