.PHONY: clean all lib demo fstool

# -*- Settings -*-

DEBUG = 1
PLATFORM ?= POSIX  # POSIX or ARM


# -*- Target names & dirs -*-

LIBBASENAME   = spritehttpd
LIB_TARGET    = ./lib$(LIBBASENAME).a
DEMO_TARGET   = ./spritehttpd-demo
FSTOOL_TARGET = ./espfstool         # Note: keep ./ here so it can be called when building demo

LIB_DIR       = spritehttpd
DEMO_DIR      = demo
FSTOOL_DIR    = fstool


# -*- Shurtcut targets -*-

all: demo lib fstool
demo: $(DEMO_TARGET)
lib: $(LIB_TARGET)
fstool: $(FSTOOL_TARGET)


# -*- Tools -*-

HOST_CC = gcc

ifeq ($(PLATFORM),ARM)
	CC = arm-none-eabi-gcc
	AR = arm-none-eabi-ar
else
	# Probably posix
	CC = gcc
	AR = ar
endif


# -*- CFLAGS -*-

# Common variables
GIT_HASH = $(shell git rev-parse --short HEAD)

# These flags are used by all targets
COMMON_CFLAGS = -Wall -Wextra -Werror \
	-Wshadow -Wfloat-equal -Wundef -Wpointer-arith -Wcast-align -Wstrict-prototypes -Wwrite-strings -Wunreachable-code -Wconversion -Winit-self \
	-Wnull-dereference -Winfinite-recursion \
 	-std=gnu99 -DGIT_HASH='"$(GIT_HASH)"' -ffunction-sections -fdata-sections
# The final binary linker should use -Wl,--gc-sections to take advantage of -ffunction-sections and -fdata-sections

LIB_CFLAGS    = $(COMMON_CFLAGS) -c -fPIC
FSTOOL_CFLAGS = $(COMMON_CFLAGS) -DZLIB_CONST -lz
DEMO_CFLAGS   = $(COMMON_CFLAGS)

ifeq ($(DEBUG), 1)
	COMMON_CFLAGS += -DDEBUG -Og -ggdb
else
	FSTOOL_CFLAGS += -O2
	DEMO_CFLAGS   += -O2
    LIB_CFLAGS    += -DNDEBUG -Os
endif


# -*- Library -*-

LIB_SOURCES = \
	lib/espfs/espfs.c \
	lib/heatshrink/heatshrink_decoder.c \
	src/utils/base64.c \
	src/utils/sha1.c \
	src/httpd.c \
	src/httpd-auth.c \
	src/httpd-utils.c \
	src/httpd-loop.c \
	src/httpd-heap.c \
	src/cgi-espfs.c \
	src/cgi-redirects.c \
	src/cgi-websocket.c

LIB_INCLUDE_DIRS = \
	src \
	include \
	lib/heatshrink \
	lib/espfs

ifeq ($(PLATFORM),ARM)
	LIB_SOURCES += src/port/httpd-freertos.c
else
	LIB_SOURCES += src/port/httpd-posix.c
endif

LIB_SOURCES := $(addprefix $(LIB_DIR)/, $(LIB_SOURCES))
LIB_OBJS     = $(LIB_SOURCES:.c=.o)
LIB_CFLAGS  += $(addprefix -I$(LIB_DIR)/, $(LIB_INCLUDE_DIRS))

# This is only used for the library files. TODO restrict it somehow
%.o: %.c
	$(CC) $(LIB_CFLAGS) -o $@ $<

$(LIB_TARGET): $(LIB_OBJS)
	$(AR) rcs $@ $^


# -*- Demo -*-

# these won't have dir prefix added - they can refer to other dirs
DEMO_FS_C_FILE = $(DEMO_DIR)/staticfiles.fs.c

DEMO_SOURCES = \
	$(DEMO_DIR)/server_demo.c \
	$(DEMO_FS_C_FILE)

DEMO_INCLUDE_DIRS = \
	$(DEMO_DIR) \
	$(LIB_DIR)/include

DEMO_STATIC_FILES = \
	index.html \
	kocour.jpg \
	template.tpl.txt

DEMO_OBJS          = $(DEMO_SOURCES:.c=.o)
DEMO_STATIC_FILES := $(addprefix $(DEMO_DIR)/staticfiles/, $(DEMO_STATIC_FILES))
DEMO_CFLAGS       += $(addprefix -I, $(DEMO_INCLUDE_DIRS))

$(DEMO_FS_C_FILE): $(FSTOOL_TARGET) $(DEMO_STATIC_FILES)
	# Create the FS image & convert it to a C file for embedding in the binary.
	# This can be split to two commands if you want to inspect the binary image (specify output and input file instead of -)
	$(FSTOOL_TARGET) -P --gzip=jpg -o - --strip=$(DEMO_DIR)/staticfiles $(DEMO_STATIC_FILES) \
		| $(FSTOOL_TARGET) -M -o $@ -i -

$(DEMO_TARGET): $(DEMO_SOURCES) $(LIB_TARGET)
	$(CC) $(DEMO_CFLAGS) $(DEMO_SOURCES) \
		-o $@ -l$(LIBBASENAME) -L.


# -*- FS builder -*-

FSTOOL_SOURCES = \
	$(FSTOOL_DIR)/main.c \
	$(FSTOOL_DIR)/parsing.c \
    $(LIB_DIR)/lib/heatshrink/heatshrink_encoder.c \
    $(LIB_DIR)/lib/heatshrink/heatshrink_decoder.c \
    $(LIB_DIR)/lib/espfs/espfs.c

FSTOOL_INCLUDE_DIRS = \
	$(FSTOOL_DIR) \
    $(LIB_DIR)/lib/heatshrink/ \
    $(LIB_DIR)/lib/espfs/

FSTOOL_CFLAGS += $(addprefix -I, $(FSTOOL_INCLUDE_DIRS))

$(FSTOOL_TARGET): $(FSTOOL_SOURCES)
	$(HOST_CC) $(FSTOOL_CFLAGS) $^ -o $@


# -*- Clean -*-

clean:
	rm -f $(FSTOOL_TARGET) $(DEMO_TARGET) $(LIB_TARGET) $(DEMO_FS_C_FILE)
	find . -type f \(         \
		   -name '*.o'        \
		-o -name '*.d'        \
		-o -name '*.a'        \
		-o -name '*.elf'      \
		-o -name '*.bin'      \
	\) -delete