.PHONY: add-submodule help

help:
	@echo "Available targets:"
	@echo "  add-submodule - Add a git submodule"
	@echo "    Usage: make add-submodule <git-url> [directory-name]"

%:
	@:

add-submodule:
	@ARGS="$(filter-out $@,$(MAKECMDGOALS))"; \
	URL=$$(echo $$ARGS | awk '{print $$1}'); \
	DIR=$$(echo $$ARGS | awk '{print $$2}'); \
	if [ -z "$$URL" ]; then \
		echo "Error: URL is required. Usage: make add-submodule <git-url> [directory-name]"; \
		exit 1; \
	fi; \
	if [ -z "$$DIR" ]; then \
		REPO_NAME=$$(echo $$URL | awk -F'/' '{print $$NF}' | sed 's/\.git$$//'); \
		SUBMODULE_DIR=$$REPO_NAME; \
	else \
		SUBMODULE_DIR=$$DIR; \
	fi; \
	ADD_OUTPUT=$$(git submodule add $$URL $$SUBMODULE_DIR 2>&1); \
	ADD_EXIT=$$?; \
	if [ $$ADD_EXIT -ne 0 ]; then \
		if echo "$$ADD_OUTPUT" | grep -q "A git directory for.*is found locally"; then \
			echo "Warning: Submodule directory already exists. Using --force to reuse it."; \
			git submodule add --force $$URL $$SUBMODULE_DIR 2>&1 || { \
				echo "Error: Failed to add submodule with --force"; \
				exit 1; \
			}; \
		else \
			echo "$$ADD_OUTPUT"; \
			exit $$ADD_EXIT; \
		fi; \
	fi; \
	UPDATE_OUTPUT=$$(git submodule update --init --recursive $$SUBMODULE_DIR 2>&1); \
	UPDATE_EXIT=$$?; \
	if [ $$UPDATE_EXIT -ne 0 ]; then \
		if echo "$$UPDATE_OUTPUT" | grep -q "empty repository\|yet to be born"; then \
			echo "Warning: Empty repository detected. Submodule added but not checked out."; \
		else \
			echo "$$UPDATE_OUTPUT"; \
			exit $$UPDATE_EXIT; \
		fi; \
	fi