###########################################################################
# Copyright 2017-2018 IoT.bzh
#
# author: Sebastien Douheret <sebastien@iot.bzh>
#
# 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.
###########################################################################

# Application Name
TARGET=xds-agent


# Syncthing version to install
SYNCTHING_VERSION = 0.14.38
SYNCTHING_INOTIFY_VERSION = 0.8.7


# Retrieve git tag/commit to set version & sub-version strings
GIT_DESC := $(shell git describe --always --tags --match "[0-9]*")
VERSION := $(firstword $(subst -, ,$(GIT_DESC)))
ifeq (-,$(findstring -,$(GIT_DESC)))
	SUB_VERSION := $(subst $(VERSION)-,,$(GIT_DESC))
endif
ifeq ($(VERSION), )
	VERSION := unknown-dev
endif
ifeq ($(SUB_VERSION), )
	SUB_VERSION := $(shell date +'%Y-%m-%d_%H%M%S')
endif

# Configurable variables for installation (default /opt/AGL/...)
ifeq ($(origin DESTDIR), undefined)
	DESTDIR := /opt/AGL/xds/agent
endif
ifeq ($(origin DESTDIR_WWW), undefined)
	DESTDIR_WWW := $(DESTDIR)/www
endif

HOST_GOOS=$(shell go env GOOS)
HOST_GOARCH=$(shell go env GOARCH)
ARCH=$(HOST_GOOS)-$(HOST_GOARCH)
REPOPATH=gerrit.automotivelinux.org/gerrit/src/xds/$(TARGET)

EXT=
ifeq ($(HOST_GOOS), windows)
	EXT=.exe
endif

mkfile_path := $(abspath $(lastword $(MAKEFILE_LIST)))
ROOT_SRCDIR := $(patsubst %/,%,$(dir $(mkfile_path)))
ROOT_GOPRJ := $(abspath $(ROOT_SRCDIR)/../../../../../..)
LOCAL_BINDIR := $(ROOT_SRCDIR)/bin
LOCAL_TOOLSDIR := $(ROOT_SRCDIR)/tools/${HOST_GOOS}
PACKAGE_DIR := $(ROOT_SRCDIR)/package

export GOPATH := $(shell go env GOPATH):$(ROOT_GOPRJ)
export PATH := $(PATH):$(LOCAL_TOOLSDIR)

# Check Go version
GOVERSION := $(shell go version |grep -o '[0-9\.]*'|head -n 1)
GOVERMAJ := $(shell echo $(GOVERSION) |cut -f1 -d.)
GOVERMIN := $(shell echo $(GOVERSION) |cut -f2 -d.)
CHECKGOVER := $(shell [ $(GOVERMAJ) -gt 1 -o \( $(GOVERMAJ) -eq 1 -a $(GOVERMIN) -ge 8 \) ] && echo true)
CHECKERRMSG := "ERROR: Go version 1.8.1 or higher is requested (current detected version: $(GOVERSION))."


VERBOSE_1 := -v
VERBOSE_2 := -v -x

# Release or Debug mode
ifeq ($(filter 1,$(RELEASE) $(REL)),)
	GO_LDFLAGS=
	# disable compiler optimizations and inlining
	GO_GCFLAGS=-N -l
	BUILD_MODE="Debug mode"
	WEBAPP_BUILD_RULE=build
else
	# optimized code without debug info
	GO_LDFLAGS=-s -w
	GO_GCFLAGS=
	BUILD_MODE="Release mode"
	WEBAPP_BUILD_RULE=build:prod
endif

# Build Package name (model: <target>_<arch>-<version>.<nb_commit_from_last_tag>.zip)
ifeq (-g,$(findstring -g,$(GIT_DESC)))
	NB_COMMIT=$(firstword $(subst -, ,$(SUB_VERSION)))
else
	NB_COMMIT=0
endif
PACKAGE_ZIPFILE := $(TARGET)_$(ARCH)-$(VERSION).$(NB_COMMIT).zip


all: tools/syncthing build

.PHONY: build
build: checkgover vendor xds webapp

xds: scripts tools/syncthing/copytobin
	@echo "### Build XDS agent (version $(VERSION), subversion $(SUB_VERSION)) - $(BUILD_MODE)";
	@cd $(ROOT_SRCDIR); $(BUILD_ENV_FLAGS) go build $(VERBOSE_$(V)) -i -o $(LOCAL_BINDIR)/$(TARGET)$(EXT) -ldflags "$(GO_LDFLAGS) -X main.AppVersion=$(VERSION) -X main.AppSubVersion=$(SUB_VERSION)" -gcflags "$(GO_GCFLAGS)" .

test: tools/glide
	go test --race $(shell $(LOCAL_TOOLSDIR)/glide novendor)

vet: tools/glide
	go vet $(shell $(LOCAL_TOOLSDIR)/glide novendor)

fmt: tools/glide
	go fmt $(shell $(LOCAL_TOOLSDIR)/glide novendor)

run: build/xds tools/syncthing/copytobin
	$(LOCAL_BINDIR)/$(TARGET)$(EXT) --log info $(XDS_AGENT_RUN_ARGS)

debug: build/xds tools/syncthing/copytobin
	$(LOCAL_BINDIR)/$(TARGET)$(EXT) --log debug $(XDS_AGENT_DEBUG_ARGS)

.PHONY: clean
clean:
	rm -rf $(LOCAL_BINDIR)/* $(ROOT_SRCDIR)/debug $(ROOT_GOPRJ)/pkg/*/$(REPOPATH) $(PACKAGE_DIR)

.PHONY: distclean
distclean: clean
	(cd $(ROOT_SRCDIR) && rm -rf $(LOCAL_BINDIR) ./tools ./glide.lock ./vendor ./*.zip ./webapp/dist ./webapp/node_modules)

webapp: webapp/install
ifneq ($(SKIP_WEBAPP_BUILD), true)
	cd webapp && npm run $(WEBAPP_BUILD_RULE)
else
	@echo "Skipping webapp build (SKIP_WEBAPP_BUILD var is set)"
endif

webapp/debug:
	cd webapp && npm run watch

webapp/install:
ifneq ($(SKIP_WEBAPP_BUILD), true)
	(cd webapp && npm install)
else
	@echo "Skipping webapp install (SKIP_WEBAPP_BUILD var is set)"
endif
	@if [ -d ${DESTDIR}/usr/local/etc ]; then rm -rf ${DESTDIR}/usr; fi

.PHONY: install
install:
	@test -e $(LOCAL_BINDIR)/$(TARGET)$(EXT) || { echo "Please execute first: make all\n"; exit 1; }
	@test -e $(LOCAL_BINDIR)/syncthing$(EXT) -a -e $(LOCAL_BINDIR)/syncthing-inotify$(EXT) || { echo "Please execute first: make all\n"; exit 1; }
	export DESTDIR=$(DESTDIR) && export DESTDIR_WWW=$(DESTDIR_WWW) && $(ROOT_SRCDIR)/scripts/install.sh

.PHONY: uninstall
uninstall:
	export DESTDIR=$(DESTDIR) && export DESTDIR_WWW=$(DESTDIR_WWW) && $(ROOT_SRCDIR)/scripts/install.sh uninstall

package: clean tools/syncthing vendor build
	@mkdir -p $(PACKAGE_DIR)/$(TARGET)/www $(PACKAGE_DIR)/scripts
	@cp -a $(LOCAL_BINDIR)/* $(PACKAGE_DIR)/$(TARGET)/
	@cp -a webapp/dist/* $(PACKAGE_DIR)/$(TARGET)/www/
ifneq ($(GOOS), windows)
		@cp -r $(ROOT_SRCDIR)/conf.d $(ROOT_SRCDIR)/scripts $(PACKAGE_DIR)/$(TARGET)/
endif
	@cp $(ROOT_SRCDIR)/conf.d/etc/xds/agent/agent-config.json $(PACKAGE_DIR)/$(TARGET)/agent-config.json.in
	@cd $(PACKAGE_DIR) && zip -r $(ROOT_SRCDIR)/$(PACKAGE_ZIPFILE) ./$(TARGET)
	@echo "### Package $(PACKAGE_ZIPFILE) has been successfuly built - $(BUILD_MODE)"

.PHONY: package-all
package-all:
	@echo "# Build linux amd64..."
	GOOS=linux GOARCH=amd64 RELEASE=1 make -f $(ROOT_SRCDIR)/Makefile package
	@echo "# Build windows amd64..."
	GOOS=windows GOARCH=amd64 RELEASE=1 SKIP_WEBAPP_BUILD=true make -f $(ROOT_SRCDIR)/Makefile package
	@echo "# Build darwin amd64..."
	GOOS=darwin GOARCH=amd64 RELEASE=1 SKIP_WEBAPP_BUILD=true make -f $(ROOT_SRCDIR)/Makefile package
	make -f $(ROOT_SRCDIR)/Makefile clean

vendor: tools/glide glide.yaml
	$(LOCAL_TOOLSDIR)/glide install --strip-vendor

vendor/debug: vendor
	(cd vendor/gerrit.automotivelinux.org/gerrit/src/xds && \
		rm -rf xds-common.git && ln -s ../../../../../../xds-common xds-common.git && \
		rm -rf xds-server.git && ln -s ../../../../../../xds-server xds-server.git )

.PHONY: tools/glide
tools/glide:
	@test -f $(LOCAL_TOOLSDIR)/glide || { \
		echo "Downloading glide"; \
		mkdir -p $(LOCAL_TOOLSDIR); \
		curl --silent --connect-timeout 60 --retry 3 -L https://glide.sh/get | GOBIN=$(LOCAL_TOOLSDIR)  sh; \
	}

.PHONY: tools/syncthing
tools/syncthing:
	@test -e $(LOCAL_TOOLSDIR)/syncthing$(EXT) -a -e $(LOCAL_TOOLSDIR)/syncthing-inotify$(EXT)  || { \
	mkdir -p $(LOCAL_TOOLSDIR); \
	DESTDIR=$(LOCAL_TOOLSDIR) \
	SYNCTHING_VERSION=$(SYNCTHING_VERSION) \
	SYNCTHING_INOTIFY_VERSION=$(SYNCTHING_INOTIFY_VERSION) \
	./scripts/get-syncthing.sh; }

.PHONY: tools/syncthing/copytobin
tools/syncthing/copytobin:
	@test -e $(LOCAL_TOOLSDIR)/syncthing$(EXT) -a -e $(LOCAL_TOOLSDIR)/syncthing-inotify$(EXT) || { echo "Please execute first: make tools/syncthing\n"; exit 1; }
	@mkdir -p $(LOCAL_BINDIR)
	@cp -f $(LOCAL_TOOLSDIR)/syncthing$(EXT) $(LOCAL_TOOLSDIR)/syncthing-inotify$(EXT) $(LOCAL_BINDIR)

.PHONY:
checkgover:
	@test "$(CHECKGOVER)" = "true" || { echo $(CHECKERRMSG); exit 1; }


.PHONY: help
help:
	@echo "Main supported rules:"
	@echo "  all                (default)"
	@echo "  build"
	@echo "  package"
	@echo "  install"
	@echo "  uninstall"
	@echo "  clean"
	@echo "  distclean"
	@echo ""
	@echo "Influential make variables:"
	@echo "  V                 - Build verbosity {0,1,2}."
	@echo "  BUILD_ENV_FLAGS   - Environment added to 'go build'."