#.rst:
# Find SDL2
# ---------
#
# Finds the SDL2 library. This module defines:
#
#  SDL2_FOUND               - True if SDL2 library is found
#  SDL2::SDL2               - SDL2 imported target
#
# Additionally these variables are defined for internal usage:
#
#  SDL2_LIBRARY_DEBUG       - SDL2 debug library, if found
#  SDL2_LIBRARY_RELEASE     - SDL2 release library, if found
#  SDL2_DLL_DEBUG           - SDL2 debug DLL on Windows, if found
#  SDL2_DLL_RELEASE         - SDL2 release DLL on Windows, if found
#  SDL2_INCLUDE_DIR         - Root include dir
#

#
#   This file is part of Magnum.
#
#   Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
#               2020, 2021, 2022 Vladimír Vondruš <mosra@centrum.cz>
#   Copyright © 2018 Jonathan Hale <squareys@googlemail.com>
#
#   Permission is hereby granted, free of charge, to any person obtaining a
#   copy of this software and associated documentation files (the "Software"),
#   to deal in the Software without restriction, including without limitation
#   the rights to use, copy, modify, merge, publish, distribute, sublicense,
#   and/or sell copies of the Software, and to permit persons to whom the
#   Software is furnished to do so, subject to the following conditions:
#
#   The above copyright notice and this permission notice shall be included
#   in all copies or substantial portions of the Software.
#
#   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
#   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
#   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
#   DEALINGS IN THE SOFTWARE.
#

# If we have a CMake subproject, use the targets directly. I'd prefer the
# static variant, however SDL2 defines its own SDL2::SDL2 alias for only the
# dynamic variant since https://github.com/libsdl-org/SDL/pull/4074 and so I'm
# forced to use that, if available.
if(TARGET SDL2)
    # In case we don't have https://github.com/libsdl-org/SDL/pull/4074 yet,
    # do the alias ourselves.
    if(NOT TARGET SDL2::SDL2)
        # Aliases of (global) targets are only supported in CMake 3.11, so we
        # work around it by this. This is easier than fetching all possible
        # properties (which are impossible to track of) and then attempting to
        # rebuild them into a new target.
        add_library(SDL2::SDL2 INTERFACE IMPORTED)
        set_target_properties(SDL2::SDL2 PROPERTIES INTERFACE_LINK_LIBRARIES SDL2)
    endif()

    # Just to make FPHSA print some meaningful location, nothing else. Not
    # using the INTERFACE_INCLUDE_DIRECTORIES as that contains
    # $<BUILD_INTERFACE and looks ugly in the output. Funnily enough, the
    # BUILD_INTERFACE thing works here without having to override it with
    # custom-found paths like I do in FindAssimp and elsewhere. Needs further
    # investigation.
    get_target_property(_SDL2_SOURCE_DIR SDL2 SOURCE_DIR)
    include(FindPackageHandleStandardArgs)
    find_package_handle_standard_args("SDL2" DEFAULT_MSG _SDL2_SOURCE_DIR)

    if(CORRADE_TARGET_WINDOWS)
        # .dll is in LOCATION, .lib is in IMPLIB. Yay, useful!
        get_target_property(SDL2_DLL_DEBUG SDL2 IMPORTED_LOCATION_DEBUG)
        get_target_property(SDL2_DLL_RELEASE SDL2 IMPORTED_LOCATION_RELEASE)
    endif()

    return()

# The static build is a separate target for some reason. I wonder HOW that
# makes more sense than just having a build-time option for static/shared and
# use the same name for both. Are all depending projects supposed to branch on
# it like this?!
elseif(TARGET SDL2-static)
    # The target should not be defined by SDL itself. If it is, that's from us.
    if(NOT TARGET SDL2::SDL2)
        # Aliases of (global) targets are only supported in CMake 3.11, so we
        # work around it by this. This is easier than fetching all possible
        # properties (which are impossible to track of) and then attempting to
        # rebuild them into a new target.
        add_library(SDL2::SDL2 INTERFACE IMPORTED)
        set_target_properties(SDL2::SDL2 PROPERTIES INTERFACE_LINK_LIBRARIES SDL2-static)
    endif()

    # Just to make FPHSA print some meaningful location, nothing else
    get_target_property(_SDL2_SOURCE_DIR SDL2-static SOURCE_DIR)
    include(FindPackageHandleStandardArgs)
    find_package_handle_standard_args("SDL2" DEFAULT_MSG _SDL2_SOURCE_DIR)

    return()
endif()

# In Emscripten SDL is linked automatically, thus no need to find the library.
# Also the includes are in SDL subdirectory, not SDL2.
if(CORRADE_TARGET_EMSCRIPTEN)
    set(_SDL2_PATH_SUFFIXES SDL)
else()
    set(_SDL2_PATH_SUFFIXES SDL2)
    if(WIN32)
        # Precompiled libraries for MSVC are in x86/x64 subdirectories
        if(MSVC)
            if(CMAKE_SIZEOF_VOID_P EQUAL 8)
                set(_SDL2_LIBRARY_PATH_SUFFIX lib/x64)
            elseif(CMAKE_SIZEOF_VOID_P EQUAL 4)
                set(_SDL2_LIBRARY_PATH_SUFFIX lib/x86)
            endif()

        # Both includes and libraries for MinGW are in some directory deep
        # inside. There's also a CMake config file but it has HARDCODED path
        # to /opt/local/i686-w64-mingw32, which doesn't make ANY SENSE,
        # especially on Windows.
        elseif(MINGW)
            if(CMAKE_SIZEOF_VOID_P EQUAL 8)
                set(_SDL2_LIBRARY_PATH_SUFFIX x86_64-w64-mingw32/lib)
                set(_SDL2_RUNTIME_PATH_SUFFIX x86_64-w64-mingw32/bin)
                list(APPEND _SDL2_PATH_SUFFIXES x86_64-w64-mingw32/include/SDL2)
            elseif(CMAKE_SIZEOF_VOID_P EQUAL 4)
                set(_SDL2_LIBRARY_PATH_SUFFIX i686-w64-mingw32/lib)
                set(_SDL2_RUNTIME_PATH_SUFFIX i686-w64-mingw32/lib)
                list(APPEND _SDL2_PATH_SUFFIXES i686-w64-mingw32/include/SDL2)
            endif()
        else()
            message(FATAL_ERROR "Unsupported compiler")
        endif()
    endif()

    find_library(SDL2_LIBRARY_RELEASE
        # Compiling SDL2 from scratch on macOS creates dead libSDL2.so symlink
        # which CMake somehow prefers before the SDL2-2.0.dylib file. Making
        # the dylib first so it is preferred. Not sure how this maps to debug
        # config though :/
        NAMES SDL2-2.0 SDL2
        PATH_SUFFIXES ${_SDL2_LIBRARY_PATH_SUFFIX})
    find_library(SDL2_LIBRARY_DEBUG
        NAMES SDL2d
        PATH_SUFFIXES ${_SDL2_LIBRARY_PATH_SUFFIX})
    # FPHSA needs one of the _DEBUG/_RELEASE variables to check that the
    # library was found -- using SDL_LIBRARY, which will get populated by
    # select_library_configurations() below.
    set(SDL2_LIBRARY_NEEDED SDL2_LIBRARY)
endif()

include(SelectLibraryConfigurations)
select_library_configurations(SDL2)

# Include dir
find_path(SDL2_INCLUDE_DIR
    # We must search file which is present only in SDL2 and not in SDL1.
    # Apparently when both SDL.h and SDL_scancode.h are specified, CMake is
    # happy enough that it found SDL.h and doesn't bother about the other.
    #
    # On macOS, where the includes are not in SDL2/SDL.h form (which would
    # solve this issue), but rather SDL2.framework/Headers/SDL.h, CMake might
    # find SDL.framework/Headers/SDL.h if SDL1 is installed, which is wrong.
    NAMES SDL_scancode.h
    PATH_SUFFIXES ${_SDL2_PATH_SUFFIXES})

# DLL on Windows
if(CORRADE_TARGET_WINDOWS)
    find_file(SDL2_DLL_RELEASE
        NAMES SDL2.dll
        PATH_SUFFIXES bin ${_SDL2_RUNTIME_PATH_SUFFIX} ${_SDL2_LIBRARY_PATH_SUFFIX})
    find_file(SDL2_DLL_DEBUG
        NAMES SDL2d.dll # not sure?
        PATH_SUFFIXES bin ${_SDL2_RUNTIME_PATH_SUFFIX} ${_SDL2_LIBRARY_PATH_SUFFIX})
endif()

# (Static) macOS / iOS dependencies. On macOS these were mainly needed when
# building SDL statically using its CMake project, on iOS always.
if(CORRADE_TARGET_APPLE AND (SDL2_LIBRARY_DEBUG MATCHES "${CMAKE_STATIC_LIBRARY_SUFFIX}$" OR SDL2_LIBRARY_RELEASE MATCHES "${CMAKE_STATIC_LIBRARY_SUFFIX}$"))
    set(_SDL2_FRAMEWORKS
        iconv # should be in the system, needed by iOS as well now
        AudioToolbox
        AVFoundation
        CoreHaptics # needed since 2.0.18(?) on iOS and macOS
        Foundation
        Metal # needed since 2.0.8 on iOS, since 2.0.14 on macOS
        GameController) # needed since 2.0.18(?) on macOS as well
    if(CORRADE_TARGET_IOS)
        list(APPEND _SDL2_FRAMEWORKS
            CoreBluetooth # needed since 2.0.10
            CoreGraphics
            CoreMotion
            Foundation
            QuartzCore
            UIKit)
    else()
        list(APPEND _SDL2_FRAMEWORKS
            Carbon
            Cocoa
            CoreAudio
            CoreVideo
            ForceFeedback
            IOKit)
    endif()
    set(_SDL2_FRAMEWORK_LIBRARIES )
    foreach(framework ${_SDL2_FRAMEWORKS})
        find_library(_SDL2_${framework}_LIBRARY ${framework})
        mark_as_advanced(_SDL2_${framework}_LIBRARY)
        list(APPEND _SDL2_FRAMEWORK_LIBRARIES ${_SDL2_${framework}_LIBRARY})
        list(APPEND _SDL2_FRAMEWORK_LIBRARY_NAMES _SDL2_${framework}_LIBRARY)
    endforeach()
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args("SDL2" DEFAULT_MSG
    ${SDL2_LIBRARY_NEEDED}
    ${_SDL2_FRAMEWORK_LIBRARY_NAMES}
    SDL2_INCLUDE_DIR)

if(NOT TARGET SDL2::SDL2)
    if(SDL2_LIBRARY_NEEDED)
        add_library(SDL2::SDL2 UNKNOWN IMPORTED)

        # Work around BUGGY framework support on macOS
        # https://cmake.org/Bug/view.php?id=14105
        if(CORRADE_TARGET_APPLE AND SDL2_LIBRARY_RELEASE MATCHES "\\.framework$")
            set_property(TARGET SDL2::SDL2 APPEND PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
            set_property(TARGET SDL2::SDL2 PROPERTY IMPORTED_LOCATION_RELEASE ${SDL2_LIBRARY_RELEASE}/SDL2)
        else()
            if(SDL2_LIBRARY_RELEASE)
                set_property(TARGET SDL2::SDL2 APPEND PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
                set_property(TARGET SDL2::SDL2 PROPERTY IMPORTED_LOCATION_RELEASE ${SDL2_LIBRARY_RELEASE})
            endif()

            if(SDL2_LIBRARY_DEBUG)
                set_property(TARGET SDL2::SDL2 APPEND PROPERTY IMPORTED_CONFIGURATIONS DEBUG)
                set_property(TARGET SDL2::SDL2 PROPERTY IMPORTED_LOCATION_DEBUG ${SDL2_LIBRARY_DEBUG})
            endif()
        endif()

        # Link additional `dl` and `pthread` libraries required by a static
        # build of SDL on Unixy platforms (except Apple, where it is most
        # probably some frameworks instead)
        if(CORRADE_TARGET_UNIX AND NOT CORRADE_TARGET_APPLE AND (SDL2_LIBRARY_DEBUG MATCHES "${CMAKE_STATIC_LIBRARY_SUFFIX}$" OR SDL2_LIBRARY_RELEASE MATCHES "${CMAKE_STATIC_LIBRARY_SUFFIX}$"))
            find_package(Threads REQUIRED)
            set_property(TARGET SDL2::SDL2 APPEND PROPERTY
                INTERFACE_LINK_LIBRARIES Threads::Threads ${CMAKE_DL_LIBS})
        endif()

        # Link frameworks on macOS / iOS if we have a static SDL
        if(CORRADE_TARGET_APPLE AND (SDL2_LIBRARY_DEBUG MATCHES "${CMAKE_STATIC_LIBRARY_SUFFIX}$" OR SDL2_LIBRARY_RELEASE MATCHES "${CMAKE_STATIC_LIBRARY_SUFFIX}$"))
            set_property(TARGET SDL2::SDL2 APPEND PROPERTY
                INTERFACE_LINK_LIBRARIES ${_SDL2_FRAMEWORK_LIBRARIES})
        endif()

        # Windows dependencies for a static library. Unfortunately there's no
        # easy way to figure out if a *.lib is static or dynamic, so we're
        # adding only if a DLL is not found.
        if(CORRADE_TARGET_WINDOWS AND NOT CORRADE_TARGET_WINDOWS_RT AND NOT SDL2_DLL_RELEASE AND NOT SDL2_DLL_DEBUG)
            set_property(TARGET SDL2::SDL2 APPEND PROPERTY INTERFACE_LINK_LIBRARIES
                # https://github.com/SDL-mirror/SDL/blob/release-2.0.10/CMakeLists.txt#L1338
                user32 gdi32 winmm imm32 ole32 oleaut32 version uuid advapi32 setupapi shell32
                # https://github.com/SDL-mirror/SDL/blob/release-2.0.10/CMakeLists.txt#L1384
                dinput8)
            # https://github.com/SDL-mirror/SDL/blob/release-2.0.10/CMakeLists.txt#L1422
            # additionally has dxerr for MSVC if DirectX SDK is not used, but
            # according to https://walbourn.github.io/wheres-dxerr-lib/ this
            # thing is long deprecated.
            if(MINGW)
                set_property(TARGET SDL2::SDL2 APPEND PROPERTY INTERFACE_LINK_LIBRARIES
                    # https://github.com/SDL-mirror/SDL/blob/release-2.0.10/CMakeLists.txt#L1386
                    dxerr8
                    # https://github.com/SDL-mirror/SDL/blob/release-2.0.10/CMakeLists.txt#L1388
                    mingw32)
            endif()
        endif()

    else()
        add_library(SDL2::SDL2 INTERFACE IMPORTED)
    endif()

    set_property(TARGET SDL2::SDL2 PROPERTY
        INTERFACE_INCLUDE_DIRECTORIES ${SDL2_INCLUDE_DIR})
endif()

mark_as_advanced(SDL2_INCLUDE_DIR)