#
# Collection of auto dection routines to improve the user eperience when
# building Qt from source.
#

function(qt_auto_detect_android)
    if(DEFINED CMAKE_TOOLCHAIN_FILE AND NOT DEFINED QT_AUTODETECT_ANDROID)

        file(READ ${CMAKE_TOOLCHAIN_FILE} toolchain_file_content OFFSET 0 LIMIT 80)
        string(FIND ${toolchain_file_content} "The Android Open Source Project" find_result REVERSE)
        if (NOT ${find_result} EQUAL -1)
            set(android_detected TRUE)
        else()
            set(android_detected FALSE)
        endif()

        if(android_detected)
            message(STATUS "Android toolchain file detected, checking configuration defaults...")
            if(NOT DEFINED ANDROID_NATIVE_API_LEVEL)
                message(STATUS "ANDROID_NATIVE_API_LEVEL was not specified, using API level 21 as default")
                set(ANDROID_NATIVE_API_LEVEL 21 CACHE STRING "")
            endif()
            if(NOT DEFINED ANDROID_STL)
                set(ANDROID_STL "c++_shared" CACHE STRING "")
            endif()
        endif()
        set(QT_AUTODETECT_ANDROID ${android_detected} CACHE STRING "")
    elseif (QT_AUTODETECT_ANDROID)
        message(STATUS "Android toolchain file detected")
    endif()
endfunction()

function(qt_auto_detect_vpckg)
    if(DEFINED ENV{VCPKG_ROOT})
        set(vcpkg_toolchain_file "$ENV{VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake")
        get_filename_component(vcpkg_toolchain_file "${vcpkg_toolchain_file}" ABSOLUTE)

        if(DEFINED CMAKE_TOOLCHAIN_FILE)
            get_filename_component(supplied_toolchain_file "${CMAKE_TOOLCHAIN_FILE}" ABSOLUTE)
            if(NOT supplied_toolchain_file STREQUAL vcpkg_toolchain_file)
                set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE "${CMAKE_TOOLCHAIN_FILE}" CACHE STRING "")
            endif()
            unset(supplied_toolchain_file)
        endif()
        set(CMAKE_TOOLCHAIN_FILE "${vcpkg_toolchain_file}" CACHE STRING "" FORCE)
        message(STATUS "Using vcpkg from $ENV{VCPKG_ROOT}")
        if(DEFINED ENV{VCPKG_DEFAULT_TRIPLET} AND NOT DEFINED VCPKG_TARGET_TRIPLET)
            set(VCPKG_TARGET_TRIPLET "$ENV{VCPKG_DEFAULT_TRIPLET}" CACHE STRING "")
            message(STATUS "Using vcpkg triplet ${VCPKG_TARGET_TRIPLET}")
        endif()
        unset(vcpkg_toolchain_file)
    endif()
endfunction()


qt_auto_detect_android()
qt_auto_detect_vpckg()