# -----------------------------------------------------------------------------
# global

.DEFAULT_GOAL := test
comma := ,
empty :=
space := $(empty) $(empty)

# -----------------------------------------------------------------------------
# go

GO_PATH ?= $(shell go env GOPATH)

PKG := $(subst $(GO_PATH)/src/,,$(CURDIR))
CGO_ENABLED ?= 0
GO_BUILDTAGS=osusergo,netgo,static
GO_LDFLAGS=-s -w "-extldflags=-static"
GO_FLAGS ?= -tags='$(subst $(space),$(comma),${GO_BUILDTAGS})' -ldflags='${GO_LDFLAGS}' -installsuffix=netgo

TOOLS_DIR := ${CURDIR}/tools
TOOLS_BIN := ${TOOLS_DIR}/bin
TOOLS := $(shell cd ${TOOLS_DIR} && go list -v -x -f '{{ join .Imports " " }}' -tags=tools)

GO_PKGS := ./...

GO_TEST ?= ${TOOLS_BIN}/gotestsum --
GO_TEST_PKGS ?= $(shell go list -f='{{if or .TestGoFiles .XTestGoFiles}}{{.ImportPath}}{{end}}' ./...)
GO_TEST_FLAGS ?= -race -count=1
GO_TEST_FUNC ?= .
GO_BENCH_FLAGS ?= -benchmem
GO_BENCH_FUNC ?= .
GO_LINT_FLAGS ?=

# Set build environment
JOBS := $(shell getconf _NPROCESSORS_CONF)

# -----------------------------------------------------------------------------
# defines

define target
@printf "+ $(patsubst ,$@,$(1))\\n" >&2
endef

# -----------------------------------------------------------------------------
# target

##@ test, bench, coverage

export GOTESTSUM_FORMAT=standard-verbose

.PHONY: test
test: CGO_ENABLED=1
test: tools/bin/gotestsum  ## Runs package test including race condition.
	$(call target)
	@CGO_ENABLED=${CGO_ENABLED} ${GO_TEST} ${GO_TEST_FLAGS} -run=${GO_TEST_FUNC} -tags='$(subst $(space),$(comma),${GO_BUILDTAGS})' ${GO_TEST_PKGS}

.PHONY: coverage
coverage: CGO_ENABLED=1
coverage: tools/bin/gotestsum  ## Takes packages test coverage.
	$(call target)
	CGO_ENABLED=${CGO_ENABLED} ${GO_TEST} ${GO_TEST_FLAGS} -covermode=atomic -coverpkg=./... -coverprofile=coverage.out $(strip ${GO_FLAGS}) ${GO_PKGS}


##@ fmt, lint

.PHONY: lint
lint: fmt lint/golangci-lint  ## Run all linters.

.PHONY: fmt
fmt: tools/goimportz tools/gofumpt  ## Run goimportz and gofumpt.
	$(call target)
	find . -iname "*.go" -not -path "./vendor/**" | xargs -P ${JOBS} ${TOOLS_BIN}/goimportz -local=${PKG},$(subst /protocol,,$(PKG)) -w
	find . -iname "*.go" -not -path "./vendor/**" | xargs -P ${JOBS} ${TOOLS_BIN}/gofumpt -extra -w

.PHONY: lint/golangci-lint
lint/golangci-lint: tools/golangci-lint .golangci.yml  ## Run golangci-lint.
	$(call target)
	${TOOLS_BIN}/golangci-lint -j ${JOBS} run $(strip ${GO_LINT_FLAGS}) ./...


##@ tools

.PHONY: tools
tools: tools/bin/''  ## Install tools

tools/%:  ## install an individual dependent tool
	@${MAKE} tools/bin/$* 1>/dev/null

tools/bin/%: ${TOOLS_DIR}/go.mod ${TOOLS_DIR}/go.sum
	@cd tools; \
		for t in ${TOOLS}; do \
			if [ -z '$*' ] || [ $$(basename $$t) = '$*' ]; then \
				echo "Install $$t ..." >&2; \
				GOBIN=${TOOLS_BIN} CGO_ENABLED=0 go install -mod=mod ${GO_FLAGS} "$${t}"; \
			fi \
		done


##@ clean

.PHONY: clean
clean:  ## Cleanups binaries and extra files in the package.
	$(call target)
	@rm -rf *.out *.test *.prof trace.txt ${TOOLS_BIN}


##@ miscellaneous

.PHONY: todo
TODO:  ## Print the all of (TODO|BUG|XXX|FIXME|NOTE) in packages.
	@grep -E '(TODO|BUG|XXX|FIXME)(\(.+\):|:)' $(shell find . -type f -name '*.go' -and -not -iwholename '*vendor*')

.PHONY: nolint
nolint:  ## Print the all of //nolint:... pragma in packages.
	@grep -E -C 3 '//nolint.+' $(shell find . -type f -name '*.go' -and -not -iwholename '*vendor*' -and -not -iwholename '*internal*')

.PHONY: env/%
env/%: ## Print the value of MAKEFILE_VARIABLE. Use `make env/GO_FLAGS` or etc.
	@echo $($*)


##@ help

.PHONY: help
help:  ## Show this help.
	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[33m<target>\033[0m\n"} /^[a-zA-Z_0-9\/%_-]+:.*?##/ { printf "  \033[1;32m%-20s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)