$(info ************ Build Process with Makefiles in Golang ************)

# Shorten links for My Makefile GoLang
# - http://makefile-go-download.ilima.xyz -
# - http://makefile-go-gist.ilima.xyz -

# Define Go command and flags
GO = go
DELVE = dlv
DEBUGPORT = 8181
GODEBUGFLAGS = -gcflags "all=-N -l"
GOFLAGS = -ldflags="-s -w"

# Makefiles MUST be indented using TABs and not spaces or `make` will fail.

# Why does make think the target is up to date?
# It happens when you have a file with the same name as Makefile target name in the directory where the Makefile is present.

# Makefile Tutorial
# https://makefiletutorial.com/
# https://ftp.gnu.org/old-gnu/Manuals/make-3.79.1/html_chapter/make_6.html
# https://ftp.gnu.org/old-gnu/Manuals/make-3.79.1/html_chapter/make_7.html

# Define the target executable
ifneq ($(origin target), undefined)
	TARGET := $(target)
else
	TARGET = my_app
endif

# Other variable
GO_MAKEFILE = makefile.go.json
GIST_ID = e3be354c2c3aa78a2f7956d046b0bf3a
MY_APP_ENVS ?=
MY_APP_ARGS ?=

# Change the main file if needed via the variable MY_GO_FILE/file
# $> export MY_GO_FILE=main.go
# $> MY_GO_FILE=main.go make
# $> make file=main.go
# https://www.gnu.org/software/make/manual/html_node/Origin-Function.html
ifneq ($(origin MY_GO_FILE), undefined)
	MAIN_FILE := $(MY_GO_FILE)
endif
ifneq ($(origin file), undefined)
	MAIN_FILE := $(file)
endif
ifeq ($(origin MAIN_FILE), undefined)
	MAIN_FILE := main.go
endif
$(info MAIN_FILE is $(MAIN_FILE))

# Default target: build the executable
all:
	@echo "\nPREREQUISITES needed\nVARIABLES:\n• TARGET: $(TARGET)\n• MAIN_FILE: $(MAIN_FILE) \n\nARGS:\n• file\n  e.g. make file=foo.go\n• target\n  e.g. make target=app-a\n\nENV VARs:\n• MY_GO_FILE: $(MY_GO_FILE)\n• MY_APP_ENVS: $(MY_APP_ENVS)\n• MY_APP_ARGS: $(MY_APP_ARGS)"

ls:
	@grep '^[^#[:space:]].*:' Makefile

# Rule to build the target executable
$(TARGET): $(MAIN_FILE)
	$(GO) build $(GOFLAGS) -o $(TARGET) $(MAIN_FILE)
# Rule to build the target executable
build: $(MAIN_FILE)
	$(GO) build $(GOFLAGS) -o $(TARGET) $(MAIN_FILE)

# Run target: build and run the target executable
run: $(TARGET) $(MAIN_FILE)
ifeq ($(MY_APP_ENVS),)
	./$(TARGET) $(MY_APP_ARGS)
else
	($(MY_APP_ENVS) && $(MY_APP_ENVS) ./$(TARGET) $(MY_APP_ARGS))
endif

runn:
	@echo "clean, build and run at once"
	make clean
	make build
	make run

# Clean target: remove the target executable
clean: $(TARGET)
	rm -f $(TARGET)

# Test target: run Go tests for the project
test:
	$(GO) test ./...

debug-build:
	$(GO) build $(GODEBUGFLAGS) -o $(TARGET) $(MAIN_FILE)

debug-run: 
ifeq ($(MY_APP_ENVS),)
	$(DELVE) --listen=0.0.0.0:$(DEBUGPORT) --headless=true --api-version=2 --accept-multiclient exec ./$(TARGET) --log -- $(MY_APP_ARGS)
else
	($(MY_APP_ENVS) && $(MY_APP_ENVS) $(DELVE) --listen=0.0.0.0:$(DEBUGPORT) --headless=true --api-version=2 --accept-multiclient exec ./$(TARGET) --log -- $(MY_APP_ARGS))
endif

debug-runn:
	@echo "clean, build and debug at once"
	make clean
	make debug-build
	make debug-run

debug-conn:
	$(DELVE) connect 0.0.0.0:$(DEBUGPORT)

open-help:
	vim -c ":h ilima-help | only"

open-help-golang:
	vim -c ":h ilima-help-golang | only"

update-makefile:
	curl https://gist.githubusercontent.com/igorlima/$(GIST_ID)/raw/Makefile -o Makefile
ifeq (, $(shell which jq))
	@echo "no jq installed, install it to make possible to have the Makefile Go JSON"
else
	$(eval COMMITS = $(shell curl -L \
		-H "Accept: application/vnd.github+json" \
		-H "X-GitHub-Api-Version: 2022-11-28" \
		https://api.github.com/gists/$(GIST_ID)/commits?per_page=10))
	$(shell echo '$(COMMITS)' | jq -r '.[0] | {version, committed_at}' > $(GO_MAKEFILE))
endif

check-makefile:
ifeq (, $(shell which jq))
	$(error "no jq installed, install it to proceed")
endif

	$(eval COMMITS = $(shell curl -L \
		-H "Accept: application/vnd.github+json" \
		-H "X-GitHub-Api-Version: 2022-11-28" \
		https://api.github.com/gists/$(GIST_ID)/commits?per_page=10))
	$(eval LAST_COMMIT_ID = $(shell echo '$(COMMITS)' | jq -r '.[0].version'))
	$(eval LAST_COMMIT_DATE = $(shell echo '$(COMMITS)' | jq -r '.[0].committed_at'))
	@echo "\nlast commit"
	@echo "  • id: $(LAST_COMMIT_ID)"
	@echo "  • date: $(LAST_COMMIT_DATE)"
	@echo "  • link: https://gist.github.com/igorlima/$(GIST_ID)/$(LAST_COMMIT_ID)"

ifneq ("$(wildcard $(GO_MAKEFILE))","")
# alternative to check if a file exists
#   test -e makefile.go.json && echo -n yes || echo -n no
#   ifeq ($(shell test -e file_name && echo -n yes),yes)
	$(eval LOCAL_COMMIT_ID = $(shell cat $(GO_MAKEFILE) | jq -r '.version'))
	$(eval LOCAL_COMMIT_DATE = $(shell cat $(GO_MAKEFILE) | jq -r '.committed_at'))
	@echo "\nlocal commit"
	@echo "  • id: $(LOCAL_COMMIT_ID)"
	@echo "  • date: $(LOCAL_COMMIT_DATE)"
	@echo "  • link: https://gist.github.com/igorlima/$(GIST_ID)/$(LOCAL_COMMIT_ID)"
else
	@echo "\nno $(GO_MAKEFILE) yet, run 'make update-makefile' to create a $(GO_MAKEFILE)"
endif


# https://www.gnu.org/software/make/manual/html_node/Multi_002dLine.html
define GIST_API
# https://docs.github.com/en/rest/gists/gists?apiVersion=2022-11-28#list-gist-commits
# List gist commits
curl -L \
  -H "Accept: application/vnd.github+json" \
  -H "X-GitHub-Api-Version: 2022-11-28" \
  https://api.github.com/gists/e3be354c2c3aa78a2f7956d046b0bf3a/commits?per_page=10

# Get a gist revision
curl -L \
  -H "Accept: application/vnd.github+json" \
  -H "X-GitHub-Api-Version: 2022-11-28" \
  https://api.github.com/gists/e3be354c2c3aa78a2f7956d046b0bf3a/d3c088a4370741f96159c12fac1a1525729c9a3f
endef