# http://agdr.org/2020/05/14/Polyglot-Makefiles.html
# https://tech.davis-hansson.com/p/make/

# .ONESHELL:
SHELL					:= bash
# IFS					:= $'\n\t'
.SHELLFLAGS 			:= -o pipefail -o noclobber -o errexit -o pipefail -o nounset -c
# .SHELLFLAGS 			:= -o pipefail -o errexit -o pipefail -o nounset -c
# .SHELLFLAGS 			:= -euf -o pipefail -c
.DEFAULT_GOAL			:= all
.DELETE_ON_ERROR:
MAKEFLAGS 				+= --print-directory
MAKEFLAGS 				+= --warn-undefined-variables
MAKEFLAGS 				+= --no-builtin-rules
# MAKEFLAGS 				+= --no-builtin-variables
# MAKEFLAGS 				+= --environment-overrides
# MAKEFLAGS 			+= --jobs=32
# https://www.gnu.org/software/make/manual/html_node/Parallel-Output.html#Parallel-Output
# MAKEFLAGS 			+= --output-sync=target
# # debug
# MAKEFLAGS 			+= --just-print
# MAKEFLAGS 			+= --dry-run
# MAKEFLAGS 			+= --recon

BOLD   								:= \033[1m
MISC  								:= \033[32m
YELLOW 								:= \033[33m
GREEN								:= \033[92m${BOLD}
RED									:= \033[91m
RESET  								:= \033[0m

GIT_REV								:= $(shell git rev-parse --short HEAD)

DIR_NAME							:= $(shell basename $(shell pwd))
PATH								:= $(shell echo "${HOME}/.cargo/bin:${PATH}")
PATH_FULL							:= $(shell pwd)
PATH_TEST_RANDOM_GENERATED_STRING	:= ${PATH_FULL}/testdata
RANDOM_GENERATED_STRINGS_TOTAL		:= 1000
VERBOSE								:= --verbose
CARGO_TERM_VERBOSE					:= 1

export VERBOSE
export CARGO_TERM_VERBOSE

.PHONY: format run
all: format run

# .PHONY: debug format lint build test run
# all: debug format lint build test run

.PHONY: debug
debug:
	@printf "%b" "${GREEN}" "$@ ---> printing environmental variables ... " "${RESET}" "\n"
	@echo -e $(foreach VAR,$(.VARIABLES),"${BOLD}${MISC}$(VAR)${RESET}=$($(VAR))\n")
	@printf "%b" "${GREEN}" "$@ ---> running ... " "${RESET}" "\n"
	@printf "%b" "${BOLD}${MISC}" "GIT_REV" "${RESET}" "=" "${GIT_REV}" "\n"
	@printf "%b" "${BOLD}${MISC}" "PATH" "${RESET}" "=" "${PATH}" "\n"
	@printf "%b" "${BOLD}${MISC}" "DIR_NAME" "${RESET}" "=" "${DIR_NAME}" "\n"
	@printf "%b" "${BOLD}${MISC}" "VERBOSE" "${RESET}" "=" "${VERBOSE}" "\n"
	@printf "%b" "${BOLD}${MISC}" "CARGO_TERM_VERBOSE" "${RESET}" "=" "${CARGO_TERM_VERBOSE}" "\n"

.PHONY: clean
clean:
	@printf "%b" "${GREEN}" "$@ ---> running ... " "${RESET}" "\n"
	VERBOSE="--verbose" cargo clean

.PHONY: build
build:
	@printf "%b" "${GREEN}" "$@ ---> running ... " "${RESET}" "\n"
	VERBOSE="--verbose" cargo build

.PHONY: test
test:
	@printf "%b" "${GREEN}" "$@ ---> running ... " "${RESET}" "\n"
	VERBOSE="--verbose" cargo test

# https://stackoverflow.com/questions/6273608/how-to-pass-argument-to-makefile-from-command-line/6273809
# https://stackoverflow.com/questions/2214575/passing-arguments-to-make-run
.PHONY: run
run:
	@printf "%b" "${GREEN}" "$@ ---> running ... " "${RESET}" "\n"
	VERBOSE="--verbose" cargo run -- $(filter-out $@,$(MAKECMDGOALS))

# This allows us to accept extra arguments (by doing nothing when we get a job that doesn't match, rather than throwing an error).
%:
	@:

.PHONY: lint
lint:
	@printf "%b" "${GREEN}" "$@ ---> running ... " "${RESET}" "\n"
	VERBOSE="--verbose" cargo clippy

.PHONY: format
format:
	@printf "%b" "${GREEN}" "$@ ---> running ... " "${RESET}" "\n"
	VERBOSE="--verbose" cargo +nightly fmt --verbose --all
	@# VERBOSE="--verbose" cargo +nightly --all
	@# #rustup toolchain install nightly
	@# rustup toolchain install --profile minimal --component rustfmt,clippy nightly
	@# rustup component add rustfmt --toolchain nightly

.PHONY: rustup
rustup:
	@printf "%b" "${GREEN}" "$@ ---> running ... " "${RESET}" "\n"
	rustup update
	rustup component add clippy
	rustup component add rustfmt
	rustup component add rustfmt-preview
	@# #rustup toolchain install nightly
	@# rustup toolchain install --profile minimal --component rustfmt,clippy nightly
	@# rustup component add rustfmt --toolchain nightly

# TODO: Check the rest of the commands exist ...
CMD_EXISTS := $(shell command -v shuf 2> /dev/null)

.PHONY: generate_random
generate_random: OUTPUT_FILE_BASENAME:=${PATH_TEST_RANDOM_GENERATED_STRING}/countdistinct/elements
generate_random:
	@printf "%b" "${GREEN}" "$@ ---> running: generating random data to OUTPUT_FILE_BASENAME=${OUTPUT_FILE_BASENAME}/*... " "${RESET}" "\n"
	mkdir -p "$(shell dirname ${OUTPUT_FILE_BASENAME})"
	@# echo $(shell echo ${OUTPUT_FILE_BASENAME}{,_binary,_hex}.txt)
	rm -vf $(shell echo ${OUTPUT_FILE_BASENAME}{,_binary,_hex}.txt)
ifdef CMD_EXISTS
	@for x in `seq ${RANDOM_GENERATED_STRINGS_TOTAL}`; do \
		echo $$(shuf -r -n10 /usr/share/dict/words); \
	done > "${OUTPUT_FILE_BASENAME}.txt"
else
	$(error 'canot find shuf')
endif
	@for x in `seq ${RANDOM_GENERATED_STRINGS_TOTAL}`; do \
		for y in `seq 64`; do \
			printf "%d" $$(( $$RANDOM % 2 )); \
		done; \
		echo; \
	done > "${OUTPUT_FILE_BASENAME}_binary.txt"
	@for x in `seq ${RANDOM_GENERATED_STRINGS_TOTAL}`; do \
		echo "obase=16; ibase=2; $$(for y in `seq 32`; do \
			printf "%d" $$(( $$RANDOM % 2 )); \
		done)" | bc; \
	done > "${OUTPUT_FILE_BASENAME}_hex.txt"
	@printf "%b" "${GREEN}" "$@ ---> completed: generating random data to ${OUTPUT_FILE_BASENAME}/*, contents=$(shell ls -1C $(shell dirname ${OUTPUT_FILE_BASENAME})) ... " "${RESET}" "\n"
	@cat $(shell echo ${OUTPUT_FILE_BASENAME}{,_binary,_hex}.txt)

.PHONY: web
web:
	@printf "%b" "${GREEN}" "$@ ---> running ... " "${RESET}" "\n"