set(ANYPS5_VULKAN_HEADERS_INCLUDE_DIR "${CMAKE_SOURCE_DIR}/3rdparty/Vulkan-Headers/include")
set(ANYPS5_SPIRV_HEADERS_INCLUDE_DIR "${CMAKE_SOURCE_DIR}/3rdparty/SPIRV-Headers/include")
set(ANYPS5_SDL2_INCLUDE_DIR "${CMAKE_SOURCE_DIR}/3rdparty/SDL2/include")
set(ANYPS5_GLSLANG_INCLUDE_DIRS "${CMAKE_SOURCE_DIR}/3rdparty/glslang")
set(ANYPS5_SPIRV_HEADERS_SOURCE_DIR "${CMAKE_SOURCE_DIR}/3rdparty/SPIRV-Headers")
set(ANYPS5_GLSLANG_SOURCE_DIR "${CMAKE_SOURCE_DIR}/3rdparty/glslang")

if(NOT ANYPS5_USE_SYSTEM_DEPS)
    return()
endif()

include(CheckCXXSourceCompiles)

find_package(SDL2 CONFIG REQUIRED)
if(NOT TARGET SDL2::SDL2)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: SDL2 was found but does not provide SDL2::SDL2")
endif()
add_library(SDL2-static INTERFACE)
target_link_libraries(SDL2-static INTERFACE SDL2::SDL2)
get_target_property(ANYPS5_SDL2_INCLUDE_DIR SDL2::SDL2 INTERFACE_INCLUDE_DIRECTORIES)
if(NOT ANYPS5_SDL2_INCLUDE_DIR)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: SDL2::SDL2 exposes no INTERFACE_INCLUDE_DIRECTORIES")
endif()
set(ANYPS5_SDL2_PROBE_INCLUDES ${ANYPS5_SDL2_INCLUDE_DIR})
foreach(_dir IN LISTS ANYPS5_SDL2_INCLUDE_DIR)
    list(APPEND ANYPS5_SDL2_PROBE_INCLUDES "${_dir}/SDL2")
endforeach()
list(REMOVE_DUPLICATES ANYPS5_SDL2_PROBE_INCLUDES)
set(CMAKE_REQUIRED_INCLUDES ${ANYPS5_SDL2_PROBE_INCLUDES})
check_cxx_source_compiles("#include \"SDL_config.h\"\n#ifndef SDL_JOYSTICK_HIDAPI\n#error SDL_JOYSTICK_HIDAPI is not defined\n#endif\nint main() { return 0; }" ANYPS5_SDL2_HAS_HIDAPI)
unset(CMAKE_REQUIRED_INCLUDES)
if(NOT ANYPS5_SDL2_HAS_HIDAPI)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: the system SDL2 does not define SDL_JOYSTICK_HIDAPI, so a DualSense gets no light bar, touchpad or trigger effects and the disk audio driver does not preserve the requested format; sdl2-compat (SDL3 underneath) and SDL2 builds with HIDAPI disabled both fail the pad and audio tests; install a real SDL2 2.x built with HIDAPI")
endif()

find_package(Freetype REQUIRED)
if(NOT TARGET Freetype::Freetype)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: freetype was found but does not provide Freetype::Freetype")
endif()
add_library(freetype INTERFACE)
target_link_libraries(freetype INTERFACE Freetype::Freetype)

find_package(VulkanHeaders CONFIG REQUIRED)
if(NOT TARGET Vulkan::Headers)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: Vulkan-Headers was found but does not provide Vulkan::Headers")
endif()
get_target_property(ANYPS5_VULKAN_HEADERS_INCLUDE_DIR Vulkan::Headers INTERFACE_INCLUDE_DIRECTORIES)
if(NOT ANYPS5_VULKAN_HEADERS_INCLUDE_DIR)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: Vulkan::Headers exposes no INTERFACE_INCLUDE_DIRECTORIES")
endif()
set(CMAKE_REQUIRED_INCLUDES ${ANYPS5_VULKAN_HEADERS_INCLUDE_DIR})
check_cxx_source_compiles("#include <vulkan/vulkan.h>\nint main() { VkPhysicalDeviceMaintenance8FeaturesKHR features{}; (void)features; return 0; }" ANYPS5_VULKAN_HAS_MAINTENANCE8)
unset(CMAKE_REQUIRED_INCLUDES)
if(NOT ANYPS5_VULKAN_HAS_MAINTENANCE8)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: the system Vulkan-Headers do not provide VkPhysicalDeviceMaintenance8FeaturesKHR (VK_KHR_maintenance8), which the agc driver uses; install Vulkan-Headers 1.4.310 or newer")
endif()

find_package(SPIRV-Headers CONFIG REQUIRED)
if(NOT TARGET SPIRV-Headers::SPIRV-Headers)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: SPIRV-Headers was found but does not provide SPIRV-Headers::SPIRV-Headers")
endif()
get_target_property(ANYPS5_SPIRV_HEADERS_INCLUDE_DIR SPIRV-Headers::SPIRV-Headers INTERFACE_INCLUDE_DIRECTORIES)
if(NOT ANYPS5_SPIRV_HEADERS_INCLUDE_DIR)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: SPIRV-Headers::SPIRV-Headers exposes no INTERFACE_INCLUDE_DIRECTORIES")
endif()

find_package(glslang CONFIG REQUIRED)
if(NOT TARGET glslang::glslang OR NOT TARGET glslang::SPIRV)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: glslang was found but does not provide glslang::glslang and glslang::SPIRV")
endif()
add_library(glslang INTERFACE)
target_link_libraries(glslang INTERFACE glslang::glslang)
add_library(SPIRV INTERFACE)
target_link_libraries(SPIRV INTERFACE glslang::SPIRV)
find_path(ANYPS5_GLSLANG_PUBLIC_INCLUDE_DIR NAMES glslang/Public/ShaderLang.h)
if(NOT ANYPS5_GLSLANG_PUBLIC_INCLUDE_DIR)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: glslang/Public/ShaderLang.h was not found; the glslang headers are incomplete")
endif()
set(ANYPS5_GLSLANG_SPIRV_INCLUDE_DIR "${ANYPS5_GLSLANG_PUBLIC_INCLUDE_DIR}/glslang")
if(NOT EXISTS "${ANYPS5_GLSLANG_SPIRV_INCLUDE_DIR}/SPIRV/GlslangToSpv.h")
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: ${ANYPS5_GLSLANG_SPIRV_INCLUDE_DIR}/SPIRV/GlslangToSpv.h was not found")
endif()
set(ANYPS5_GLSLANG_INCLUDE_DIRS "${ANYPS5_GLSLANG_PUBLIC_INCLUDE_DIR};${ANYPS5_GLSLANG_SPIRV_INCLUDE_DIR}")

find_program(ANYPS5_GLSLANG_STANDALONE_EXECUTABLE NAMES glslang glslangValidator)
if(NOT ANYPS5_GLSLANG_STANDALONE_EXECUTABLE)
    message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: the glslang compiler (glslang or glslangValidator) was not found; install the glslang tools package")
endif()
add_executable(glslang-standalone IMPORTED GLOBAL)
set_target_properties(glslang-standalone PROPERTIES IMPORTED_LOCATION "${ANYPS5_GLSLANG_STANDALONE_EXECUTABLE}")

if(ANYPS5_ENABLE_SPIRV_TOOLS)
    find_package(SPIRV-Tools-opt CONFIG REQUIRED)
    if(NOT TARGET SPIRV-Tools-opt)
        message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: SPIRV-Tools was found but does not provide SPIRV-Tools-opt")
    endif()
    if(NOT TARGET SPIRV-Tools-static)
        if(TARGET SPIRV-Tools)
            add_library(SPIRV-Tools-static INTERFACE)
            target_link_libraries(SPIRV-Tools-static INTERFACE SPIRV-Tools)
        else()
            message(FATAL_ERROR "ANYPS5_USE_SYSTEM_DEPS: SPIRV-Tools was found but provides neither SPIRV-Tools-static nor SPIRV-Tools")
        endif()
    endif()
endif()

set(ANYPS5_SYSTEM_DEPS_STAMP "")
list(APPEND ANYPS5_SYSTEM_DEPS_PACKAGES VulkanHeaders SPIRV-Headers glslang)
if(ANYPS5_ENABLE_SPIRV_TOOLS)
    list(APPEND ANYPS5_SYSTEM_DEPS_PACKAGES SPIRV-Tools-opt)
endif()
foreach(_package IN LISTS ANYPS5_SYSTEM_DEPS_PACKAGES)
    set(_version "unknown")
    if(DEFINED ${_package}_VERSION)
        set(_version "${${_package}_VERSION}")
    endif()
    string(APPEND ANYPS5_SYSTEM_DEPS_STAMP " ${_package}=${_version}")
endforeach()