# cannot commit files larger than 100 MB to GitHub 
FILE_SIZE_LIMIT_MB = 100
LARGE_FILES := $(shell find ./gds -type f -name "*.gds")
LARGE_FILES += $(shell find . -type f -size +$(FILE_SIZE_LIMIT_MB)M -not -path "./.git/*" -not -path "./gds/*")

LARGE_FILES_GZ := $(addsuffix .gz, $(LARGE_FILES))

ARCHIVES := $(shell find . -type f -name "*.gz")
ARCHIVE_SOURCES := $(basename $(ARCHIVES))

# PDK setup configs
THREADS ?= $(shell nproc)
STD_CELL_LIBRARY ?= sky130_fd_sc_hd
SPECIAL_VOLTAGE_LIBRARY ?= sky130_fd_sc_hvl
IO_LIBRARY ?= sky130_fd_io
SKYWATER_COMMIT ?= 3d7617a1acb92ea883539bcf22a632d6361a5de4
OPEN_PDKS_COMMIT ?= 8688323e12530b9ced04b8053a6c4699b28402fc

.DEFAULT_GOAL := ship
# We need portable GDS_FILE pointers...
.PHONY: ship
ship: check-env uncompress
	@echo "###############################################"
	@echo "Generating Caravel GDS (sources are in the 'gds' directory)"
	@sleep 1
	@cp gds/caravel.gds gds/caravel.old.gds && echo "Copying old Caravel to gds/caravel.old.gds" || true
	@cd gds && MAGTYPE=mag magic -rcfile ${PDK_ROOT}/sky130A/libs.tech/magic/current/sky130A.magicrc -noc -dnull gen_caravel.tcl < /dev/null


.PHONY: clean
clean:
	echo "clean"


.PHONY: verify
verify:
	echo "verify"


$(LARGE_FILES_GZ): %.gz: %
	@if ! [ $(suffix $<) == ".gz" ]; then\
		gzip -n --best $< > /dev/null &&\
		echo "$< -> $@";\
	fi

# This target compresses all files larger than $(FILE_SIZE_LIMIT_MB) MB
.PHONY: compress
compress: $(LARGE_FILES_GZ)
	@echo "Files larger than $(FILE_SIZE_LIMIT_MB) MBytes are compressed!"


$(ARCHIVE_SOURCES): %: %.gz
	@gzip -d $< &&\
	echo "$< -> $@";\

.PHONY: uncompress
uncompress: $(ARCHIVE_SOURCES)
	@echo "All files are uncompressed!"

.PHONY: pdk
pdk: skywater-pdk skywater-library open_pdks build-pdk

$(PDK_ROOT)/skywater-pdk:
	git clone https://github.com/google/skywater-pdk.git $(PDK_ROOT)/skywater-pdk

.PHONY: skywater-pdk
skywater-pdk: check-env $(PDK_ROOT)/skywater-pdk
	cd $(PDK_ROOT)/skywater-pdk && \
		git checkout -qf $(SKYWATER_COMMIT)

.PHONY: skywater-library
skywater-library: check-env $(PDK_ROOT)/skywater-pdk
	cd $(PDK_ROOT)/skywater-pdk && \
		git submodule update --init libraries/$(STD_CELL_LIBRARY)/latest && \
		git submodule update --init libraries/$(IO_LIBRARY)/latest && \
		git submodule update --init libraries/$(SPECIAL_VOLTAGE_LIBRARY)/latest && \
		$(MAKE) -j$(THREADS) timing

### OPEN_PDKS
$(PDK_ROOT)/open_pdks:
	git clone https://github.com/RTimothyEdwards/open_pdks.git $(PDK_ROOT)/open_pdks

.PHONY: open_pdks
open_pdks: check-env $(PDK_ROOT)/open_pdks
	cd $(PDK_ROOT)/open_pdks && \
		git checkout -qf $(OPEN_PDKS_COMMIT)

.PHONY: build-pdk
build-pdk: check-env $(PDK_ROOT)/open_pdks $(PDK_ROOT)/skywater-pdk
	[ -d $(PDK_ROOT)/sky130A ] && \
		(echo "Warning: A sky130A build already exists under $(PDK_ROOT). It will be deleted first!" && \
		sleep 5 && \
		rm -rf $(PDK_ROOT)/sky130A) || \
		true
	cd $(PDK_ROOT)/open_pdks && \
		./configure --with-sky130-source=$(PDK_ROOT)/skywater-pdk/libraries --with-sky130-local-path=$(PDK_ROOT) && \
		cd sky130 && \
		$(MAKE) veryclean && \
		$(MAKE) && \
		$(MAKE) install-local

check-env:
ifndef PDK_ROOT
	$(error PDK_ROOT is undefined, please export it before running make)
endif