# Root Makefile for uTun - Out-of-tree build wrapper
# This Makefile provides convenient targets for building in a separate directory
# while keeping binaries in the project root.

# Build directory
BUILD_DIR = build

# Detect source directory (where this Makefile is located)
SRC_DIR := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))

# Check if build directory is configured
BUILD_CONFIGURED := $(shell test -f $(BUILD_DIR)/Makefile && echo yes || echo no)

# Default target: build everything
.PHONY: all
all:
ifeq ($(BUILD_CONFIGURED),yes)
	@$(MAKE) -C $(BUILD_DIR) all
else
	@echo "Build directory not configured. Run 'make setup' first."
	@exit 1
endif

# Setup target: create build directory and configure
.PHONY: setup
setup:
	@echo "Setting up build in $(BUILD_DIR)/..."
	@mkdir -p $(BUILD_DIR)
	@if test ! -f $(BUILD_DIR)/Makefile; then \
		echo "Running configure..."; \
		cd $(BUILD_DIR) && $(SRC_DIR)/configure; \
	else \
		echo "Build already configured."; \
	fi
	@echo "Setup complete. Run 'make' to build."

# Reconfigure target
.PHONY: reconfigure
reconfigure:
	@rm -rf $(BUILD_DIR)
	@$(MAKE) setup

# Build just the main binary (skip tests)
.PHONY: utun
utun:
ifeq ($(BUILD_CONFIGURED),yes)
	@$(MAKE) -C $(BUILD_DIR)/lib
	@$(MAKE) -C $(BUILD_DIR)/src
	@echo "utun binary built successfully."
else
	@echo "Build directory not configured. Run 'make setup' first."
	@exit 1
endif

# Run tests (make all builds everything including tests)
.PHONY: check test
check: all
ifeq ($(BUILD_CONFIGURED),yes)
	@$(MAKE) -C $(BUILD_DIR) check
else
	@echo "Build directory not configured. Run 'make setup' first."
	@exit 1
endif

test: check

# Clean build directory
.PHONY: clean
clean:
ifeq ($(BUILD_CONFIGURED),yes)
	@$(MAKE) -C $(BUILD_DIR) clean
else
	@echo "Build directory not configured."
endif

# Full clean - remove build directory and generated files
.PHONY: distclean
distclean:
	@rm -rf $(BUILD_DIR)
	@echo "Build directory removed."

# Install from build directory
.PHONY: install
install: all
	@$(MAKE) -C $(BUILD_DIR) install

# Debug build setup
.PHONY: setup-debug
setup-debug:
	@echo "Setting up debug build in $(BUILD_DIR)/..."
	@mkdir -p $(BUILD_DIR)
	cd $(BUILD_DIR) && $(SRC_DIR)/configure --enable-debug

# Release build setup
.PHONY: setup-release
setup-release:
	@echo "Setting up release build in $(BUILD_DIR)/..."
	@mkdir -p $(BUILD_DIR)
	cd $(BUILD_DIR) && $(SRC_DIR)/configure --disable-debug

# Print help
.PHONY: help
help:
	@echo "uTun Build System (Out-of-tree build)"
	@echo "======================================"
	@echo ""
	@echo "Setup targets:"
	@echo "  setup         - Configure the build directory"
	@echo "  setup-debug   - Configure for debug build"
	@echo "  setup-release - Configure for release build"
	@echo "  reconfigure   - Clean and reconfigure build"
	@echo ""
	@echo "Build targets:"
	@echo "  all           - Build everything: lib, src, tests"
	@echo "  utun          - Build only main utun binary (faster)"
	@echo "  check         - Run all tests (builds if needed)"
	@echo "  test          - Alias for check"
	@echo "  install       - Install binaries"
	@echo ""
	@echo "Maintenance:"
	@echo "  clean         - Clean build artifacts"
	@echo "  distclean     - Remove build directory completely"
	@echo "  help          - Show this help"
	@echo ""
	@echo "Build directory: $(BUILD_DIR)/"
	@echo "Source directory: $(SRC_DIR)/"
	@echo ""
	@echo "Usage: make setup && make"

# Pass through any unknown targets to the build directory if configured
.PHONY: %
%: 
ifeq ($(BUILD_CONFIGURED),yes)
	@$(MAKE) -C $(BUILD_DIR) $@
else
	@echo "Build directory not configured. Run 'make setup' first."
	@exit 1
endif