PYTHON ?= python3
PIP ?= $(PYTHON) -m pip
SRC_DIR := $(CURDIR)/src
ENTRYPOINT := src/flow/__main__.py
DIST_DIR := dist
BUILD_DIR := build
SPEC_FILE := flow.spec
BINARY := $(DIST_DIR)/flow
INSTALL_DIR ?= $(HOME)/.local/bin

.PHONY: deps build install install-local check-binary clean help

help:
	@printf "Targets:\n"
	@printf "  make deps          Install build dependencies\n"
	@printf "  make build         Build standalone binary at dist/flow\n"
	@printf "  make install       Build and install to ~/.local/bin/flow\n"
	@printf "  make install-local Install binary to ~/.local/bin/flow\n"
	@printf "  make check-binary  Run dist/flow --help\n"
	@printf "  make clean         Remove build artifacts\n"

deps:
	@set -eu; \
	PIP_CMD="$(PIP)"; \
	if ! $$PIP_CMD --version >/dev/null 2>&1; then \
		if command -v pip3 >/dev/null 2>&1; then \
			PIP_CMD="pip3"; \
		elif $(PYTHON) -m ensurepip --version >/dev/null 2>&1; then \
			$(PYTHON) -m ensurepip --upgrade; \
		elif command -v apt-get >/dev/null 2>&1; then \
			echo "pip missing; installing python3-pip via apt-get (sudo required)"; \
			sudo apt-get update; \
			sudo apt-get install -y python3-pip; \
		elif command -v dnf >/dev/null 2>&1; then \
			echo "pip missing; installing python3-pip via dnf (sudo required)"; \
			sudo dnf install -y python3-pip; \
		elif command -v brew >/dev/null 2>&1; then \
			echo "pip missing; installing python via Homebrew"; \
			brew install python; \
		else \
			echo "Unable to bootstrap pip automatically. Install pip for $(PYTHON) and rerun make deps."; \
			exit 1; \
		fi; \
	fi; \
	$$PIP_CMD install -e ".[build]"

build: deps
	$(PYTHON) -m PyInstaller --noconfirm --clean --onefile --name flow --paths "$(SRC_DIR)" "$(ENTRYPOINT)"

install-local: build
	mkdir -p "$(INSTALL_DIR)"
	install -m 755 "$(BINARY)" "$(INSTALL_DIR)/flow"
	@printf "Installed flow to $(INSTALL_DIR)/flow\n"

install: deps build install-local

check-binary:
	"./$(BINARY)" --help

clean:
	rm -rf "$(BUILD_DIR)" "$(DIST_DIR)" "$(SPEC_FILE)"