#
# Copyright (c) 2018 Intel Corporation
#
# SPDX-License-Identifier: Apache-2.0
#
# Check that the system golang version is within the required version range
# for this project.

golang_version_raw=$(shell go version 2>/dev/null)
not_check_version=
ifeq (,$(GOPATH))
    golang_version_raw=
endif
ifeq (,$(golang_version_raw))
    not_check_version=y
endif
ifneq (,$(SKIP_GO_VERSION_CHECK))
    not_check_version=y
endif

ifeq (,$(not_check_version))
    have_yq=$(shell if [ -x "$(GOPATH)/bin/yq" ]; then echo "true"; else echo ""; fi)
    ifeq (,$(have_yq))
        $(info INFO: yq was not found in GOPATH/bin, installing it)
        install_yq=$(shell ../../ci/install_yq.sh)
    endif
    ifneq (,$(install_yq))
        $(error "ERROR: install yq failed")
    endif

    YQ_VERSION=$(shell $(GOPATH)/bin/yq --version | grep -oE "version v?[0-9]+" | grep -oE "[0-9]+")
    QUERY="languages.golang.version"

    ifneq (,$(findstring 4,$(YQ_VERSION)))
        YQ_CMD=$(GOPATH)/bin/yq eval .$(QUERY) ../../versions.yaml
    else
        YQ_CMD=$(GOPATH)/bin/yq r ../../versions.yaml $(QUERY)
    endif

    golang_version_min=$(shell $(YQ_CMD))

    ifeq (,$(golang_version_min))
        $(error "ERROR: cannot determine minimum golang version")
    endif

    golang_version_min_fields=$(subst ., ,$(golang_version_min))

    golang_version_min_major=$(word 1,$(golang_version_min_fields))
    golang_version_min_minor=$(word 2,$(golang_version_min_fields))

    # for error messages
    golang_version_needed=$(golang_version_min_major).$(golang_version_min_minor)

    # determine actual version of golang
    golang_version=$(subst go,,$(word 3,$(golang_version_raw)))

    golang_version_fields=$(subst ., ,$(golang_version))

    golang_version_major=$(word 1,$(golang_version_fields))
    golang_version_minor=$(word 2,$(golang_version_fields))

    golang_major_ok=$(shell test $(golang_version_major) -ge $(golang_version_min_major) && echo ok)
    golang_minor_ok=$(shell test $(golang_version_major) -eq $(golang_version_min_major) -a $(golang_version_minor) -ge $(golang_version_min_minor) && echo ok)

    ifeq (,$(golang_major_ok))
        $(error "ERROR: golang major version too old: got $(golang_version), need atleast $(golang_version_needed)")
    endif

    ifeq (,$(golang_minor_ok))
        $(error "ERROR: golang minor version too old: got $(golang_version), need atleast $(golang_version_needed)")
    endif
endif