.PHONY: all fetch rootfs initramfs iso disk-image \
       test-boot test-k8s test-persistence test-deploy test-storage test-all \
       dev-vm dev-vm-shell quick docker-build shellcheck \
       kernel-audit clean distclean help

SHELL := /bin/bash
VERSION := $(shell cat VERSION)
BUILD_DIR := build
CACHE_DIR := $(BUILD_DIR)/cache
OUTPUT_DIR := output
ROOTFS_DIR := $(BUILD_DIR)/rootfs-work

# Load component versions
include $(BUILD_DIR)/config/versions.env

# Default target
all: iso

# =============================================================================
# Download external components
# =============================================================================
fetch:
	@echo "==> Fetching components..."
	@mkdir -p $(CACHE_DIR)
	$(BUILD_DIR)/scripts/fetch-components.sh

# =============================================================================
# Build stages
# =============================================================================
rootfs: fetch
	@echo "==> Preparing rootfs..."
	$(BUILD_DIR)/scripts/extract-core.sh
	$(BUILD_DIR)/scripts/inject-kubesolo.sh

initramfs: rootfs
	@echo "==> Packing initramfs..."
	$(BUILD_DIR)/scripts/pack-initramfs.sh

iso: initramfs
	@echo "==> Creating bootable ISO..."
	$(BUILD_DIR)/scripts/create-iso.sh
	@echo "==> Built: $(OUTPUT_DIR)/$(OS_NAME)-$(VERSION).iso"

disk-image: initramfs
	@echo "==> Creating disk image..."
	$(BUILD_DIR)/scripts/create-disk-image.sh
	@echo "==> Built: $(OUTPUT_DIR)/$(OS_NAME)-$(VERSION).img"

# =============================================================================
# Kernel validation
# =============================================================================
kernel-audit:
	@echo "==> Auditing kernel configuration..."
	$(BUILD_DIR)/config/kernel-audit.sh

# =============================================================================
# Testing
# =============================================================================
test-boot: iso
	@echo "==> Testing boot in QEMU..."
	test/qemu/test-boot.sh $(OUTPUT_DIR)/$(OS_NAME)-$(VERSION).iso

test-k8s: iso
	@echo "==> Testing K8s readiness..."
	test/integration/test-k8s-ready.sh $(OUTPUT_DIR)/$(OS_NAME)-$(VERSION).iso

test-persistence: disk-image
	@echo "==> Testing persistence across reboot..."
	test/qemu/test-persistence.sh $(OUTPUT_DIR)/$(OS_NAME)-$(VERSION).img

test-deploy: iso
	@echo "==> Testing workload deployment..."
	test/integration/test-deploy-workload.sh $(OUTPUT_DIR)/$(OS_NAME)-$(VERSION).iso

test-storage: iso
	@echo "==> Testing local storage provisioning..."
	test/integration/test-local-storage.sh $(OUTPUT_DIR)/$(OS_NAME)-$(VERSION).iso

test-all: test-boot test-k8s test-persistence

# Full integration test suite (requires more time)
test-integration: test-k8s test-deploy test-storage

# =============================================================================
# Code quality
# =============================================================================
shellcheck:
	@echo "==> Running shellcheck on init scripts..."
	shellcheck -s sh init/init.sh init/lib/*.sh init/emergency-shell.sh
	@echo "==> Running shellcheck on build scripts..."
	shellcheck -s bash build/scripts/*.sh build/config/kernel-audit.sh
	@echo "==> Running shellcheck on test scripts..."
	shellcheck -s bash test/qemu/*.sh test/integration/*.sh test/kernel/*.sh
	@echo "==> Running shellcheck on hack scripts..."
	shellcheck -s bash hack/*.sh
	@echo "==> All shellcheck checks passed"

# =============================================================================
# Development helpers
# =============================================================================
dev-vm: iso
	@echo "==> Launching dev VM..."
	hack/dev-vm.sh $(OUTPUT_DIR)/$(OS_NAME)-$(VERSION).iso

dev-vm-shell: iso
	@echo "==> Launching dev VM (emergency shell)..."
	hack/dev-vm.sh $(OUTPUT_DIR)/$(OS_NAME)-$(VERSION).iso --shell

dev-vm-debug: iso
	@echo "==> Launching dev VM (debug mode)..."
	hack/dev-vm.sh $(OUTPUT_DIR)/$(OS_NAME)-$(VERSION).iso --debug

# Fast rebuild: only repack initramfs + ISO (skip fetch/extract)
quick:
	@echo "==> Quick rebuild (repack + ISO only)..."
	$(BUILD_DIR)/scripts/inject-kubesolo.sh
	$(BUILD_DIR)/scripts/pack-initramfs.sh
	$(BUILD_DIR)/scripts/create-iso.sh
	@echo "==> Quick rebuild complete: $(OUTPUT_DIR)/$(OS_NAME)-$(VERSION).iso"

# =============================================================================
# Docker-based reproducible build
# =============================================================================
docker-build:
	@echo "==> Building in Docker..."
	docker build -t kubesolo-os-builder -f $(BUILD_DIR)/Dockerfile.builder .
	docker run --rm --privileged \
		-v $(PWD)/$(OUTPUT_DIR):/output \
		-v $(PWD)/$(CACHE_DIR):/cache \
		kubesolo-os-builder make iso OUTPUT_DIR=/output CACHE_DIR=/cache

# =============================================================================
# Cleanup
# =============================================================================
clean:
	@echo "==> Cleaning build artifacts..."
	rm -rf $(ROOTFS_DIR) $(OUTPUT_DIR)
	@echo "==> Clean. (Cache preserved in $(CACHE_DIR); use 'make distclean' to remove)"

distclean: clean
	rm -rf $(CACHE_DIR)

# =============================================================================
# Help
# =============================================================================
help:
	@echo "KubeSolo OS Build System (v$(VERSION))"
	@echo ""
	@echo "Build targets:"
	@echo "  make fetch          Download Tiny Core ISO, KubeSolo, dependencies"
	@echo "  make rootfs         Extract + prepare rootfs with KubeSolo"
	@echo "  make initramfs      Repack rootfs into kubesolo-os.gz"
	@echo "  make iso            Create bootable ISO (default target)"
	@echo "  make disk-image     Create raw disk image with boot + data partitions"
	@echo "  make quick          Fast rebuild (re-inject + repack + ISO only)"
	@echo "  make docker-build   Reproducible build inside Docker"
	@echo ""
	@echo "Test targets:"
	@echo "  make test-boot      Boot ISO in QEMU, verify boot success"
	@echo "  make test-k8s       Boot + verify K8s node reaches Ready"
	@echo "  make test-persist   Reboot disk image, verify state persists"
	@echo "  make test-deploy    Deploy nginx pod, verify Running"
	@echo "  make test-storage   Test PVC with local-path provisioner"
	@echo "  make test-all       Run core tests (boot + k8s + persistence)"
	@echo "  make test-integ     Run full integration suite"
	@echo ""
	@echo "Dev targets:"
	@echo "  make dev-vm         Launch interactive QEMU VM"
	@echo "  make dev-vm-shell   Launch QEMU VM -> emergency shell"
	@echo "  make dev-vm-debug   Launch QEMU VM with debug logging"
	@echo "  make kernel-audit   Check kernel config against requirements"
	@echo "  make shellcheck     Lint all shell scripts"
	@echo ""
	@echo "Cleanup:"
	@echo "  make clean          Remove build artifacts (preserve cache)"
	@echo "  make distclean      Remove everything including cache"