# Copyright 2016 The Rook Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# remove default suffixes as we dont use them
.SUFFIXES:

SHELL := /bin/bash
ifneq (, $(shell command -v shasum))
SHA256CMD := shasum -a 256
else ifneq (, $(shell command -v sha256sum))
SHA256CMD := sha256sum
else
$(error "please install 'shasum' or 'sha256sum'")
endif

ifeq ($(origin PLATFORM), undefined)
ifeq ($(origin GOOS), undefined)
GOOS := $(shell go env GOOS)
endif
ifeq ($(origin GOARCH), undefined)
GOARCH := $(shell go env GOARCH)
endif
PLATFORM := $(GOOS)_$(GOARCH)
else
GOOS := $(word 1, $(subst _, ,$(PLATFORM)))
GOARCH := $(word 2, $(subst _, ,$(PLATFORM)))
export GOOS GOARCH
endif

ALL_PLATFORMS ?= darwin_amd64 windows_amd64 linux_amd64 linux_arm64

ifeq ($(PLATFORM),linux_amd64)
CROSS_TRIPLE = x86_64-linux-gnu
endif
ifeq ($(PLATFORM),linux_arm64)
CROSS_TRIPLE = aarch64-linux-gnu
endif
ifeq ($(PLATFORM),darwin_amd64)
CROSS_TRIPLE=x86_64-apple-darwin15
endif
ifeq ($(PLATFORM),windows_amd64)
CROSS_TRIPLE=x86_64-w64-mingw32
endif
export GOARM

# force the build of a linux binary when running on MacOS
GOHOSTOS=linux
GOHOSTARCH := $(shell go env GOHOSTARCH)
HOST_PLATFORM := $(GOHOSTOS)_$(GOHOSTARCH)

ifneq ($(PLATFORM),$(HOST_PLATFORM))
ifeq (,$(shell go env CC))
CC := $(CROSS_TRIPLE)-gcc
else
CC := $(shell go env CC)
endif
ifeq (,$(shell go env CXX))
CXX := $(CROSS_TRIPLE)-gcc
else
CXX := $(shell go env CXX)
endif
export CC CXX
endif

# REAL_HOST_PLATFORM is used to determine the correct url to download the various binary tools from and it does not use
# HOST_PLATFORM which is used to build the program.
REAL_HOST_PLATFORM=$(shell go env GOHOSTOS)_$(GOHOSTARCH)

# set the version number. you should not need to do this
# for the majority of scenarios.
ifeq ($(origin VERSION), undefined)
VERSION := $(shell git describe --dirty --always --tags | sed 's/-/./2' | sed 's/-/./2' )
endif
export VERSION

# include the common make file
COMMON_SELF_DIR := $(dir $(lastword $(MAKEFILE_LIST)))

ifeq ($(origin ROOT_DIR),undefined)
ROOT_DIR := $(abspath $(shell cd $(COMMON_SELF_DIR)/../.. && pwd -P))
endif
ifeq ($(origin OUTPUT_DIR),undefined)
OUTPUT_DIR := $(ROOT_DIR)/_output
endif
ifeq ($(origin WORK_DIR), undefined)
WORK_DIR := $(ROOT_DIR)/.work
endif
ifeq ($(origin CACHE_DIR), undefined)
CACHE_DIR := $(ROOT_DIR)/.cache
endif

TOOLS_DIR := $(CACHE_DIR)/tools
TOOLS_HOST_DIR := $(TOOLS_DIR)/$(HOST_PLATFORM)

ifeq ($(origin HOSTNAME), undefined)
HOSTNAME := $(shell hostname)
endif

# a registry that is scoped to the current build tree on this host
ifeq ($(origin BUILD_REGISTRY), undefined)
BUILD_REGISTRY := build-$(shell echo $(HOSTNAME)-$(ROOT_DIR) | $(SHA256CMD) | cut -c1-8)
endif
ifeq ($(BUILD_REGISTRY),build-)
$(error Failed to get unique ID for host+dir. Check that '$(SHA256CMD)' functions or override SHA256CMD)
endif

SED_IN_PLACE = $(ROOT_DIR)/build/sed-in-place
export SED_IN_PLACE

# This is a neat little target that prints any variable value from the Makefile
# Usage: make echo.IMAGES echo.PLATFORM
echo.%: ; @echo $* = $($*)

# Select which images (backends) to make; default to all possible images
IMAGES ?= ceph

COMMA := ,
SPACE :=
SPACE +=

# define a newline
define \n


endef