vcpkg_check_linkage(ONLY_DYNAMIC_CRT)
if(VCPKG_TARGET_IS_WINDOWS)
    set(VCPKG_POLICY_DLLS_IN_STATIC_LIBRARY enabled) # some parts of this port can only build as a shared library.
endif()

vcpkg_from_gitlab(
    GITLAB_URL https://gitlab.freedesktop.org
    OUT_SOURCE_PATH SOURCE_PATH
    REPO mesa/mesa
    REF mesa-${VERSION}
    SHA512 202b2b20ffe7d357570a0d0bf0b53dc246b3e903738e8c8a000c5f61109ab5233d62de217444f49fd62927f8c418d929e5a2a5a800d1e39e334d50eb090e850c
    FILE_DISAMBIGUATOR 1
    HEAD_REF master
)

x_vcpkg_get_python_packages(PYTHON_VERSION "3" OUT_PYTHON_VAR "PYTHON3" PACKAGES setuptools mako)
get_filename_component(PYTHON3_DIR "${PYTHON3}" DIRECTORY)
vcpkg_add_to_path(PREPEND "${PYTHON3_DIR}")

vcpkg_find_acquire_program(FLEX)
get_filename_component(FLEX_DIR "${FLEX}" DIRECTORY)
vcpkg_add_to_path(PREPEND "${FLEX_DIR}")
vcpkg_find_acquire_program(BISON)
get_filename_component(BISON_DIR "${BISON}" DIRECTORY)
vcpkg_add_to_path(PREPEND "${BISON_DIR}")

if(WIN32) # WIN32 HOST probably has win_flex and win_bison!
    if(NOT EXISTS "${FLEX_DIR}/flex${VCPKG_HOST_EXECUTABLE_SUFFIX}")
        if(FLEX_DIR MATCHES "${DOWNLOADS}")
            file(CREATE_LINK "${FLEX}" "${FLEX_DIR}/flex${VCPKG_HOST_EXECUTABLE_SUFFIX}")
        else()
            message(FATAL_ERROR "${PORT} requires flex being named flex on windows and not win_flex!\n(Can be solved by creating a simple link from win_flex to flex)")
        endif()
    endif()
    if(NOT EXISTS "${BISON_DIR}/BISON${VCPKG_HOST_EXECUTABLE_SUFFIX}")
        if(BISON_DIR MATCHES "${DOWNLOADS}")
            file(CREATE_LINK "${BISON}" "${BISON_DIR}/bison${VCPKG_HOST_EXECUTABLE_SUFFIX}")
        else()
            message(FATAL_ERROR "${PORT} requires bison being named bison on windows and not win_bison!\n(Can be solved by creating a simple link from win_bison to bison)")
        endif()
    endif()
endif()

# For features https://github.com/pal1000/mesa-dist-win should be probably studied a bit more. 
list(APPEND MESA_OPTIONS -Dzstd=enabled)
list(APPEND MESA_OPTIONS -Dvalgrind=disabled)
list(APPEND MESA_OPTIONS -Dshared-llvm=disabled)
list(APPEND MESA_OPTIONS -Dcpp_rtti=true)

if("offscreen" IN_LIST FEATURES)
    list(APPEND MESA_OPTIONS -Dosmesa=true)
else()
    list(APPEND MESA_OPTIONS -Dosmesa=false)
endif()

if("llvm" IN_LIST FEATURES)
    list(APPEND MESA_OPTIONS -Dllvm=enabled)
else()
    list(APPEND MESA_OPTIONS -Dllvm=disabled)
endif()

set(use_gles OFF)
if("gles1" IN_LIST FEATURES)
    list(APPEND MESA_OPTIONS -Dgles1=enabled)
    set(use_gles ON)
else()
    list(APPEND MESA_OPTIONS -Dgles1=disabled)
endif()
if("gles2" IN_LIST FEATURES)
    list(APPEND MESA_OPTIONS -Dgles2=enabled)
    set(use_gles ON)
else()
    list(APPEND MESA_OPTIONS -Dgles2=disabled)
endif()

if(use_gles)
    list(APPEND MESA_OPTIONS -Dshared-glapi=enabled)  # shared GLAPI required when building two or more of the following APIs - gles1 gles2
else()
    list(APPEND MESA_OPTIONS -Dshared-glapi=auto)
endif()

if("egl" IN_LIST FEATURES)
    list(APPEND MESA_OPTIONS -Degl=enabled)
else()
    list(APPEND MESA_OPTIONS -Degl=disabled)
endif()

if(VCPKG_TARGET_IS_WINDOWS)
    list(APPEND MESA_OPTIONS -Dplatforms=['windows'])
    list(APPEND MESA_OPTIONS -Dmicrosoft-clc=disabled)
    if(NOT VCPKG_TARGET_IS_MINGW)
        set(VCPKG_CXX_FLAGS "/D_CRT_DECLARE_NONSTDC_NAMES ${VCPKG_CXX_FLAGS}")
        set(VCPKG_C_FLAGS "/D_CRT_DECLARE_NONSTDC_NAMES ${VCPKG_C_FLAGS}")
    endif()
endif()

vcpkg_configure_meson(
    SOURCE_PATH "${SOURCE_PATH}"
    OPTIONS 
        -Dgles-lib-suffix=_mesa
        -Dbuild-tests=false
        ${MESA_OPTIONS}
    ADDITIONAL_BINARIES
        python=['${PYTHON3}','-I']
        python3=['${PYTHON3}','-I']
)
vcpkg_install_meson()
vcpkg_fixup_pkgconfig()

file(REMOVE_RECURSE
    "${CURRENT_PACKAGES_DIR}/debug/include"
    "${CURRENT_PACKAGES_DIR}/debug/share"
    # installed by egl-registry
    "${CURRENT_PACKAGES_DIR}/include/KHR"
    "${CURRENT_PACKAGES_DIR}/include/EGL"
    # installed by opengl-registry
    "${CURRENT_PACKAGES_DIR}/include/GL"
    "${CURRENT_PACKAGES_DIR}/include/GLES"
    "${CURRENT_PACKAGES_DIR}/include/GLES2"
    "${CURRENT_PACKAGES_DIR}/include/GLES3"
)
file(GLOB remaining "${CURRENT_PACKAGES_DIR}/include/*")
if(NOT remaining)
    # All headers to be provided by egl-registry and/or opengl-registry
    set(VCPKG_POLICY_EMPTY_INCLUDE_FOLDER enabled)
    file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/include")
endif()

if(VCPKG_TARGET_IS_WINDOWS)
    # opengl32.lib is already installed by port opengl.
    # Mesa claims to provide a drop-in replacement of opengl32.dll.
    file(MAKE_DIRECTORY "${CURRENT_PACKAGES_DIR}/lib/manual-link")
    file(RENAME "${CURRENT_PACKAGES_DIR}/lib/opengl32.lib" "${CURRENT_PACKAGES_DIR}/lib/manual-link/opengl32.lib")
    if(NOT VCPKG_BUILD_TYPE)
        file(MAKE_DIRECTORY "${CURRENT_PACKAGES_DIR}/debug/lib/manual-link")
        file(RENAME "${CURRENT_PACKAGES_DIR}/debug/lib/opengl32.lib" "${CURRENT_PACKAGES_DIR}/debug/lib/manual-link/opengl32.lib")
    endif()
endif()

if(FEATURES STREQUAL "core")
    file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug")
endif()

vcpkg_install_copyright(FILE_LIST "${SOURCE_PATH}/docs/license.rst")