#!/usr/bin/make -f

# Target architecture for compilation
ARCH = native

# Optimization level
O = 2

# Flags for the compiler
FLAGS  = -std=c23
FLAGS += -O$(O)
FLAGS += -march=$(ARCH)
# Only override gcc default tuning if specified in make command line
ifneq (, $(TUNE))
	FLAGS += -mtune=$(TUNE)
endif
FLAGS += -pedantic
FLAGS += -Wall
FLAGS += -Wextra
FLAGS += -Werror
FLAGS += -Wconversion
FLAGS += -Wmissing-prototypes
FLAGS += -Wlogical-op
FLAGS += -Wdisabled-optimization
FLAGS += -fanalyzer
# These flags are because of the compiler otherwise giving too much warning
FLAGS += -Wno-sign-conversion
FLAGS += -Wformat-truncation=0

# Compile flag for defining GITHASH to put at the end of the version string
GITFLAG = -D'GITHASH=$(shell git rev-parse --short=1 HEAD)'

# Directories where .o files and excecutables will be placed
OBJDIR = obj
OUTDIR = out

# The UI to compile for by default using make run
#UI_TARGET = vt100
UI_TARGET = ncurses
UI_TESTING = stub

# The URL of the plaintext version of the lisence, for the --license option
LICENSEURL = https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt

# C compiler
CC = cc

# Test options
TEST_COLUMNS = 1000
TEST_ROWS = 30

.NOTINTERMEDIATE:

# Messages to print during different steps in making
MSG_FETCHING = FETCHING:
MSG_LINKING = Linking:
MSG_COMPILING = Compiling C:
MSG_CLEANING = Cleaning:
MSG_CLEANING_OBJ = Cleaning $(OBJDIR):
MSG_CLEANING_OUT = Cleaning $(OUTDIR):

# Compile for all UI targets
all: $(addprefix $(OUTDIR)/connect4_,ncurses.elf vt100.elf stub.elf)

# Compile and run the default UI target
run: $(OUTDIR)/connect4_$(UI_TARGET).elf
	./$<

# Compile and run with a specific UI target
run_%: $(OUTDIR)/connect4_%.elf
	./$<

# Show result of test
test: test.diff

# Diff between the tests
test.diff: test.log test.log.slow
	diff -y $^ > $@ || tail $@
	diff -q $^

# Log of testing fast logic
test.log: $(OUTDIR)/connect4_$(UI_TESTING).elf
	./$< -o $@ -c $(TEST_COLUMNS) -r $(TEST_ROWS) --random-moves

# Log of testing slow logic
test.log.slow: $(OUTDIR)/connect4_$(UI_TESTING).elf
	./$< -o $@ -c $(TEST_COLUMNS) -r $(TEST_ROWS) --random-moves --slow-calcWins

# Compile specifically the ncurses version
# This one's special because it needs -lncursesw
$(OUTDIR)/connect4_ncurses.elf: $(addprefix $(OBJDIR)/,ui_ncurses.o logic.o connect4.o LICENSE.o)
	@echo $(MSG_LINKING) $@
	@mkdir -p $(@D)
	$(CC) $(FLAGS) -lncursesw -o $@ $^

# Compile the final excecutable for a given UI target
$(OUTDIR)/connect4_%.elf: $(addprefix $(OBJDIR)/,ui_%.o logic.o connect4.o LICENSE.o)
	@echo $(MSG_LINKING) $@
	@mkdir -p $(@D)
	$(CC) $(FLAGS) -o $@ $^

# Make an object file for the license so it does not all need to be in the code
$(OBJDIR)/LICENSE.o: $(OBJDIR)/LICENSE
	@echo $(MSG_LINKING) $@
	@mkdir -p $(@D)
	cd $(@D); ld -r -b binary -o $(@F) $(^F)

# Compile the object file of the main code.
# This one's special because it includes the git hash
$(OBJDIR)/connect4.o: connect4.c
	@echo $(MSG_COMPILING) $^
	@mkdir -p $(@D)
	$(CC) -c $(FLAGS) $(GITFLAG) -o $@ $^

# Generic object file compile
$(OBJDIR)/%.o: %.c
	@echo $(MSG_COMPILING) $^
	@mkdir -p $(@D)
	$(CC) -c $(FLAGS) -o $@ $^

# Download the license file in non-markdown form.
# This is not cleaned as that would be too silly
$(OBJDIR)/LICENSE:
	@echo $(MSG_FETCHING) $@
	curl $(LICENSEURL) \
		| sed -n '/END OF TERMS AND CONDITIONS/q;p' > $(OBJDIR)/LICENSE

# Remove all compilation output and intermediate files
clean:
	@echo $(MSG_CLEANING)
	@echo $(MSG_CLEANING_OBJ)
	rm -f $(OBJDIR)/*.o
	@echo $(MSG_CLEANING_OUT)
	rm -f $(OUTDIR)/*.elf