SRC_DIR=./src
OBJ_DIR=./obj
BIN_DIR?=./bin
INC_DIR=./include $(INHERIT_INCLUDES)

ifdef COMPUTER
	CC = clang
else
	CC = arm-linux-gnueabihf-gcc
	CXX = arm-linux-gnueabihf-g++
endif

CPPFLAGS = -I .
CFLAGS =-g -std=gnu99 -O1 -Wall
CXXFLAGS = -g -std=gnu++11 -O1 -Wall

ifdef COMPUTER
LDFLAGS = -lrt -lpthread -lmagic -ljpeg -lpng $(shell sdl2-config --libs) -lSDL2_image
CFLAGS += -DCOMPUTER $(shell sdl2-config --cflags)
else
LDFLAGS = -lrt -lpthread -l :libmagic.so.1 -l :libjpeg.so.62 -l :libz.so -l :libpng16.so.16
endif

NAME=image-viewer
BINARY=$(BIN_DIR)/$(NAME)

SRC=$(wildcard $(SRC_DIR)/*.c)
OBJ=$(patsubst $(SRC_DIR)/%.c, $(OBJ_DIR)/%.o, $(SRC))

CFLAGS+=-I$(INC_DIR) -Wall -Werror
CFLAGS+=$(shell sdl2-config --cflags)

#TARGET_IP ?= 192.168.202.127
ifeq ($(TARGET_IP),)
ifneq ($(filter debug run,$(MAKECMDGOALS)),)
$(warning The target IP address is not set)
$(warning Run as "TARGET_IP=192.168.202.xxx make run" or modify Makefile)
TARGET_IP ?= 192.168.202.xxx
endif
endif
TARGET_DIR ?= /tmp/$(shell whoami)
TARGET_USER ?= root
# for use from Eduroam network use TARGET_IP=localhost and enable next line
SSH_OPTIONS=-o "UserKnownHostsFile=/dev/null" -o "StrictHostKeyChecking=no" -o "Port=2222"
SSH_GDB_TUNNEL_REQUIRED=y
SSH_OPTIONS+=-i ~/.ssh/mzapo-root-key
#SSH_OPTIONS=-i /opt/zynq/ssh-connect/mzapo-root-key
#SSH_OPTIONS=-o 'ProxyJump=ctu_login@postel.felk.cvut.cz'

.PHONY: all clean

all: $(BINARY)

$(BINARY): $(OBJ) | $(BIN_DIR)
	$(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@

$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIR)
	$(CC) $(CFLAGS) -c $< -o $@

$(BIN_DIR) $(OBJ_DIR):
	echo $(BIN_DIR)
	mkdir -p $@

dep: depend

depend: $(SRC) $(HEADERS)
	echo '# autogenerated dependencies' > depend
ifneq ($(filter %.c,$(SRC)),)
	$(CC) $(CFLAGS) $(CPPFLAGS) -w -E -M $(filter %.c,$(SRC)) \
	  >> depend
endif
ifneq ($(filter %.cpp,$(SRC)),)
	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -w -E -M $(filter %.cpp,$(SRC)) \
	  >> depend
endif

copy-executable: $(BINARY)
	ssh $(SSH_OPTIONS) -t $(TARGET_USER)@$(TARGET_IP) killall gdbserver 1>/dev/null 2>/dev/null || true
	ssh $(SSH_OPTIONS) $(TARGET_USER)@$(TARGET_IP) mkdir -p $(TARGET_DIR)
	scp $(SSH_OPTIONS) $(BINARY) $(TARGET_USER)@$(TARGET_IP):$(TARGET_DIR)/$(NAME)

run: copy-executable $(BINARY)
	ssh $(SSH_OPTIONS) -t $(TARGET_USER)@$(TARGET_IP) $(TARGET_DIR)/$(NAME)

ifneq ($(filter -o ProxyJump=,$(SSH_OPTIONS))$(SSH_GDB_TUNNEL_REQUIRED),)
SSH_GDB_PORT_FORWARD=-L 12345:127.0.0.1:12345
TARGET_GDB_PORT=127.0.0.1:12345
else
TARGET_GDB_PORT=$(TARGET_IP):12345
endif

debug: copy-executable $(BINARY)
	xterm -e ssh $(SSH_OPTIONS) $(SSH_GDB_PORT_FORWARD) -t $(TARGET_USER)@$(TARGET_IP) gdbserver :12345 $(TARGET_DIR)/$(NAME) &
	sleep 2
	echo >connect.gdb "target extended-remote $(TARGET_GDB_PORT)"
	echo >>connect.gdb "b main"
	echo >>connect.gdb "c"
	ddd --debugger gdb-multiarch -x connect.gdb $(BINARY)

clean:
	$(RM) -rv $(BIN_DIR) $(OBJ_DIR)
	$(RM) -rv .cache
	$(RM) -rv connect.gdb
	$(RM) -rv depend

-include $(OBJ:.o=.d)
-include depend