#!/usr/bin/make -f

# Target architecture for compilation
ARCH = native

# Optimization level
O = s

# Flags for the compiler
FLAGS  = -std=c99
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
FLAGS += -flto
FLAGS += -s
FLAGS += -Wl,--gc-sections
# These flags are because of the compiler otherwise giving too much warning
#FLAGS += -Wno-sign-conversion
#FLAGS += -Wformat-truncation=0

ifneq (, $(EXTRA_FLAGS))
	FLAGS += $(EXTRA_FLAGS)
endif


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

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

# 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
LD = ld
CC_W64 = x86_64-w64-mingw32-gcc
LD_W64 = x86_64-w64-mingw32-ld

# 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):
MSG_CLEANING_TEST = Cleaning $(TESTDIR):

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

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

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

# Compile and run with a specific UI target
w64_run_%: $(OUTDIR)/connect4_%.exe
	wine ./$<

# Show result of test
test: $(TESTDIR)/test.diff

# Diff between the tests
$(TESTDIR)/test.diff: $(TESTDIR)/test.log $(TESTDIR)/test.log.slow
	@mkdir -p $(@D)
	diff -y $^ > $@ || tail $@
	diff -q $^

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

# Log of testing slow logic
$(TESTDIR)/test.log.slow: $(OUTDIR)/connect4_$(UI_TESTING).elf
	@mkdir -p $(@D)
	./$< -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 $@ $^

# Compile a windows excecutable
$(OUTDIR)/connect4_%.exe: $(addprefix $(OBJDIR)/w64_,ui_%.o logic.o connect4.o LICENSE.o)
	@echo $(MSG_LINKING) $@
	@mkdir -p $(@D)
	$(CC_W64) $(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)

# Make an object file for the license so it does not all need to be in the code
$(OBJDIR)/w64_LICENSE.o: $(OBJDIR)/LICENSE
	@echo $(MSG_LINKING) $@
	@mkdir -p $(@D)
	cd $(@D); $(LD_W64) -r -b binary -o $(@F) $(^F)

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

# Windows object file compile
$(OBJDIR)/w64_%.o: %.c
	@echo $(MSG_COMPILING) $^
	@mkdir -p $(@D)
	$(CC_W64) -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
	rm -f $(OUTDIR)/*.exe
	@echo $(MSG_CLEANING_TEST)
	rm -f $(TESTDIR)/*