# Makefile helper functions for golang
#

GO_SUPPORTED_VERSIONS ?= 1.14|1.15|1.16|1.17|1.18|1.19|1.20
GO_LDFLAGS += -X $(VERSION_PACKAGE).GitVersion=$(VERSION) \
	-X $(VERSION_PACKAGE).BuildDate=$(shell TZ=America/Los_Angeles date -u +'%Y-%m-%dT%H:%M:%SZ')
ifneq ($(DLV),)
	GO_BUILD_FLAGS += -gcflags "all=-N -l"
	LDFLAGS = ""
endif
GO_BUILD_FLAGS += -ldflags "$(GO_LDFLAGS)"

ifeq ($(ROOT_PACKAGE),)
	$(error the variable ROOT_PACKAGE must be set prior to including golang.mk)
endif

GOPATH := $(shell go env GOPATH)
ifeq ($(origin GOBIN), undefined)
	GOBIN := $(GOPATH)/bin
endif

COMMANDS ?= $(filter-out %.md, $(wildcard ${ROOT_DIR}/cmd/*))
BINS ?= $(foreach cmd,${COMMANDS},$(notdir ${cmd}))

ifeq (${COMMANDS},)
  $(error Could not determine COMMANDS, set ROOT_DIR or run in source dir)
endif
ifeq (${BINS},)
  $(error Could not determine BINS, set ROOT_DIR or run in source dir)
endif

#.PHONY: go.build.verify
#go.build.verify:
#ifneq ($(shell $(GO) version | grep -q -E '\bgo($(GO_SUPPORTED_VERSIONS))\b' && echo 0 || echo 1), 0)
#	$(error unsupported go version. Please make install one of the following supported version: '$(GO_SUPPORTED_VERSIONS)')
#endif

.PHONY: go.build.%
go.build.%:
	$(eval COMMAND := $(word 2,$(subst ., ,$*)))
	$(eval PLATFORM := $(word 1,$(subst ., ,$*)))
	$(eval OS := $(word 1,$(subst _, ,$(PLATFORM))))
	$(eval ARCH := $(word 2,$(subst _, ,$(PLATFORM))))
	@echo "===========> Building binary $(COMMAND) $(VERSION) for $(OS) $(ARCH)"
	@mkdir -p $(OUTPUT_DIR)/platforms/$(OS)/$(ARCH)
	@CGO_ENABLED=0 GOOS=$(OS) GOARCH=$(ARCH) $(GO) build $(GO_BUILD_FLAGS) -o $(OUTPUT_DIR)/platforms/$(OS)/$(ARCH)/$(COMMAND)$(GO_OUT_EXT) $(ROOT_PACKAGE)/cmd/$(COMMAND)

.PHONY: go.run.%
go.run.%:
	$(eval COMMAND := $*)
	@echo "===========> Go run $(COMMAND)"
	$(GO) run $(GO_BUILD_FLAGS) $(ROOT_DIR)/cmd/$(COMMAND) -c $(OUTPUT_DIR)/config/$(COMMAND).yaml

.PHONY: go.build
go.build: go.build.verify $(addprefix go.build., $(addprefix $(PLATFORM)., $(BINS)))

.PHONY: go.build.multiarch
go.build.multiarch: go.build.verify $(foreach p,$(PLATFORMS),$(addprefix go.build., $(addprefix $(p)., $(BINS))))

.PHONY: go.lint
go.lint: tools.verify.golangci-lint
	@echo "===========> Run golangci to lint source codes"
	@golangci-lint run -c $(ROOT_DIR)/.golangci.yaml $(ROOT_DIR)/...