DESTDIR = .
PARAMETERS := $(shell cat Lego.json | grep -v '"parameterSets": ""' | jq -r '.parameterSets | keys[]')
STL = $(PARAMETERS:%=$(DESTDIR)/%.stl)
PNG = $(PARAMETERS:%=$(DESTDIR)/%.png)
INDEX = $(DESTDIR)/index.html
SCAD = Lego.scad
CONFIG = Lego.json

.PHONY: all
all: models thumbnails

.PHONY: help
help:
	@echo Targets:
	@echo all          Builds models and thumbnails
	@echo help         Shows this help file
	@echo clean        Removes generated files
	@echo models       Builds all models
	@echo thumbnails   Generates model thumbnails
	@echo webpage      Generates web page
	@echo MODEL        Builds an STL and a PNG for the given model
	@echo
	@echo Available models: $(PARAMETERS)

.PHONY: clean
clean:
	rm -f $(STL) $(PNG) $(INDEX)

.PHONY: models
models: $(STL)

.PHONY: thumbnails
thumbnails: $(PNG)

.PHONY: webpage
webpage: thumbnails $(INDEX)

$(PARAMETERS): % : $(DESTDIR)/%.png $(DESTDIR)/%.stl

$(STL) $(PNG): $(SCAD) $(CONFIG) Makefile
	mkdir -p $(@D)
	openscad -o $@ -p $(CONFIG) -P $(basename $(@F)) --camera=0,0,0,60,0,135,0 --autocenter --viewall $(SCAD)

$(INDEX): header.html entry.html footer.html Makefile
	cat header.html | sed "s/%date/`date '+%Y-%m-%d at %T'`/g" | sed "s/%version/`git describe --always --dirty`/g" > $@
	$(foreach P,$(PARAMETERS),cat entry.html | sed 's/%/$P/g' >> $@;)
	cat footer.html >> $@