MAKEFLAGS += --warn-undefined-variables -j1
SHELL := bash
.SHELLFLAGS := -eu -o pipefail -c
.DEFAULT_GOAL := all
.DELETE_ON_ERROR:
.SUFFIXES:
.PHONY:

COVERAGE_DIR ?= coverage
DOC_DIR ?= doc/api
TMP_DIR ?= test/tmp
BIN_DIR ?= bin
EXE_DIR ?= exe
VENDOR_DIR ?= node_modules

AWK ?= awk
BASH ?= bash
CAT ?= cat
COMPOSE ?= docker-compose
DOCKER ?= docker
GIT ?= git
GREP ?= grep
JQ ?= jq
JSDOC ?= $(VENDOR_DIR)/.bin/jsdoc
KILL ?= kill
MKDIR ?= mkdir
NODE ?= node
NPM ?= npm
PDF2PNG ?= $(EXE_DIR)/pdf2png
PDFGEN ?= $(BIN_DIR)/pdfgen
RM ?= rm
SLEEP ?= sleep
TEST_SERVER ?= $(EXE_DIR)/test-server
XARGS ?= xargs

HTML_FILES := $(wildcard test/fixtures/*.html)
PDF_FILES := $(shell find test/fixtures/ -name '*.pdf')

FORCE_COLOR ?= true
export FORCE_COLOR

all:
	# PDF Generator (pdfgen)
	#
	# install          Install all dependencies
	#
	# docs             Generate the application documentation
	# shell            Start an interactive shell session
	# release          Release a new Gem version (maintainers only)
	#
	# clean            Clean all runtime data
	# distclean        Same as clean and cleans dependencies
	#
	# test             Run the whole test suite
	# test-specs       Check the application specifications
	# fixtures         Regenerate all fixtures (pdf and png files)

clean: clean-test-results
	# Clean all runtime data
	@$(RM) -rf $(DOC_DIR)

clean-test-results:
	# Clean test results
	@$(RM) -rf $(TMP_DIR) $(COVERAGE_DIR)
	@$(MKDIR) -p $(TMP_DIR) $(COVERAGE_DIR)

clean-containers:
	# Clean running containers
	@$(COMPOSE) down

clean-images:
	# Clean build images
	@$(DOCKER) images --format '{{.ID}} {{.Repository}}:{{.Tag}}' \
		| $(GREP) $(shell basename "`pwd`") \
		| $(AWK) '{ print $$0 }' \
		| $(XARGS) -P4 -rn1 $(DOCKER) rmi -f \
		| $(GREP) -vP 'cannot be forced|invalid reference' || true

distclean: clean clean-containers clean-images
	# Same as clean and cleans dependencies
	@$(RM) -rf $(VENDOR_DIR)

install:
	# Install all dependencies
	@$(NPM) install

docs: clean
	# Generate the application documentation
	@$(MKDIR) -p $(DOC_DIR)
	@$(JSDOC) -d $(DOC_DIR) -r lib bin

test-specs: clean-test-results
	# Check the application specifications
	@$(NPM) run test
	@$(NPM) run coverage

test: test-specs

shell:
	# Start an interactive shell session
	@$(COMPOSE) run \
		-e LANG=en_US.UTF-8 -e LANGUAGE=en_US.UTF-8 -e LC_ALL=en_US.UTF-8 \
		-u node shell $(BASH) -c 'sleep 0.1; echo; $(BASH) -i'

pdf: \
	pdf-defaults \
	pdf-templates \
	pdf-headers

pdf-defaults:
	# Generate all PDF files with default settings
	@$(foreach HTML_FILE,$(HTML_FILES),\
		echo "# > Convert $(HTML_FILE) to PDF file"; \
		$(RM) -f $(shell pwd)/$(patsubst %.html,%.pdf,$(HTML_FILE)); \
		$(PDFGEN) \
			file://$(shell pwd)/$(HTML_FILE) \
			$(shell pwd)/$(patsubst %.html,%.pdf,$(HTML_FILE));)

pdf-templates:
	# Generate all PDF files with header/footer templates
	# > Convert test/fixtures/templates/header_footer.html to PDF file
	@$(PDFGEN) \
		file://$(abspath test/fixtures/templates/circles.html) \
		$(abspath test/fixtures/templates/circles.pdf) \
		--margin-top 2cm \
		--margin-bottom 2cm \
		--header-footer true \
		--landscape true \
		--header-template \
			'$(shell cat test/fixtures/templates/circles.header)' \
		--footer-template \
			'$(shell cat test/fixtures/templates/circles.footer)'

pdf-headers:
	# Generate a PDF with help of the header echo test server
	@$(TEST_SERVER) & \
		$(SLEEP) .3; \
		$(PDFGEN) \
			--header 'Authorization: Granted!' \
			-a 'X-Test:true' \
			--header 'custom:   header' \
			http://localhost:3823 \
			$(abspath test/fixtures/headers.pdf); \
		$(KILL) %-;

png:
	# Generate PNG files from all PDF files
	@$(foreach PDF_FILE,$(PDF_FILES),\
		echo "# > Convert $(PDF_FILE) to PNG file"; \
		$(PDF2PNG) \
			"$(shell pwd)/$(PDF_FILE)" \
			"$(shell pwd)/$(patsubst %.pdf,%.png,$(PDF_FILE))";)

fixtures: pdf png
update-pdf-images: fixtures

release:
	@$(eval VERSION=$(shell $(CAT) package.json | $(JQ) -r '.version'))
	# Release a new package version (${VERSION})
	@$(GIT) tag -a -m "Version ${VERSION}" "v${VERSION}"
	@$(NPM) publish
	@$(GIT) push
	@$(GIT) push --tags