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 b590fd1951a1949e5fe2bbfd61f0814c402af263 # mesa-23.0.1
    SHA512 7a66a587ef01fb58b51f3ebea584b40f70114844484df528d38ad1caa071fac7d6e23f1ed80309847f7e28468071571294bb8812a9882c0b86c89cf5a4144fe9
    FILE_DISAMBIGUATOR 1
    HEAD_REF master
)

x_vcpkg_get_python_packages(PYTHON_VERSION "3" OUT_PYTHON_VAR "PYTHON3" PACKAGES setuptools mako )

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 -Dshared-llvm=auto)
list(APPEND MESA_OPTIONS -Dlibunwind=disabled)
list(APPEND MESA_OPTIONS -Dlmsensors=disabled)
list(APPEND MESA_OPTIONS -Dvalgrind=disabled)
list(APPEND MESA_OPTIONS -Dglvnd=false)
list(APPEND MESA_OPTIONS -Dglx=disabled)
list(APPEND MESA_OPTIONS -Dgbm=disabled)

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()

if("gles1" IN_LIST FEATURES)
    list(APPEND MESA_OPTIONS -Dgles1=enabled)
else()
    list(APPEND MESA_OPTIONS -Dgles1=disabled)
endif()
if("gles2" IN_LIST FEATURES)
    list(APPEND MESA_OPTIONS -Dgles2=enabled)
else()
    list(APPEND MESA_OPTIONS -Dgles2=disabled)
endif()
if("opengl" IN_LIST FEATURES)
    list(APPEND MESA_OPTIONS -Dopengl=true)
else()
    list(APPEND MESA_OPTIONS -Dopengl=false)
endif()
if("egl" IN_LIST FEATURES) # EGL feature only works on Linux
    list(APPEND MESA_OPTIONS -Degl=enabled)
else()
    list(APPEND MESA_OPTIONS -Degl=disabled)
endif()

list(APPEND MESA_OPTIONS -Dshared-glapi=enabled)  #shared GLAPI required when building two or more of the following APIs - opengl, gles1 gles2

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
        #-D egl-lib-suffix=_mesa
        -Dbuild-tests=false
        ${MESA_OPTIONS}
    )
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()

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