##
# This script includes arduino specific config
##
import os
import platform

Import('env')

def __parse_config(f):
	dict = {}

	if not os.path.isfile(f):
		return dict

	file = open(f, 'r')
	strs = file.readlines()
	for str in strs:
		str = str.strip()
		if len(str) > 0 and str[0] == '#':
			continue

		idx = str.find('=')
		if idx > 0:
			dict.setdefault(str[0:idx], str[idx + 1:])

	return dict

def __get_boards(dict):
	boards = []
	keys = dict.keys()
	for key in keys:
		idx = key.find('.name')
		if idx > 0:
			if key.endswith('.name'):
				boards.append(key[0:idx])
	return boards

def __get_cpu(dict, board):
	cpus = []
	keys = dict.keys()
	for key in keys:
		idx = key.find(board + '.menu.cpu.')
		start = len(board + '.menu.cpu.')
		if idx >= 0:
			end = key.find('.', start)
			if end > 0:
				cpu = key[start:end]
				exist = False
				for c in cpus:
					if c == cpu:
						exist = True
						break

				if not exist:
					cpus.append(cpu)
	return cpus

def __get_board_info(board, key):
	if cpu:
		v = boards_info.get(board + '.menu.cpu.' + cpu + key)
		if not v:
			v = boards_info.get(board + key)
	else:
		v = boards_info.get(board + key)
	return v

def __search_files(path, pattern, ondisk=True, source=True, strings=False, recursive=True):
	if not recursive:
		return Glob(pattern, ondisk, source, strings)

	matches = []
	for root, dirnames, filenames in os.walk(path):
		#BLE library examples throw lot of errors. We dont need examples.
		if 'examples' not in root:
			matches.extend(Glob(root + '/' + pattern, ondisk, source, strings))
	return matches

# To make sure the src is built in 'BUILD_DIR' (by default it will be built at
# the same directory as the .c .cpp .S)
def __src_to_obj(env, srcs):
	objs = []
	prefix = env.get('BOARD') + '_'
	if env.get('CPU'):
		prefix += env.get('CPU') + '_'

	build_dir = env.get('BUILD_DIR') + '/arduino/'
	for src in srcs:
		obj = src.path.replace(arduino_home, build_dir)
		i = obj.rfind('.')
		obj = obj[0:i]
		if env.get('OBJSUFFIX'):
			obj += env.get('OBJSUFFIX')
		objs.extend(env.Object(obj, src, OBJPREFIX=prefix))
	return objs

def __import_lib(env, lib):
	lib_path = arduino_home + '/libraries/' + lib
	if not os.path.exists(lib_path):
		if target_arch == 'avr':
			lib_path = arduino_home + '/hardware/arduino/avr/libraries/' + lib
		else:
			lib_path = arduino_home + '/hardware/arduino/sam/libraries/' + lib

	if os.path.exists(lib_path + '/src'):
		lib_path = lib_path + '/src'

	env.AppendUnique(CPPPATH = [lib_path])

	if os.path.exists(lib_path + '/utility'):
		env.AppendUnique(CPPPATH = [lib_path + '/utility'])

	lib_src = []
	lib_src.extend(__search_files(lib_path, '*.S'))
	lib_src.extend(__search_files(lib_path, '*.c'))
	lib_src.extend(__search_files(lib_path, '*.cpp'))

	lib_obj = __src_to_obj(env, lib_src)
	build_dir = env.get('BUILD_DIR')
	if build_dir:
		lib_a = env.StaticLibrary(build_dir + lib, lib_obj)
	else:
		lib_a = env.StaticLibrary(lib, lib_obj)

	# If we link libSPI.a, the final binary is not getting launched
	# on the board.  Which is not the case if we directly use SPI.o.

	if env.get('TARGET_ARCH') == 'arm':
		if lib == 'SPI':
			for obj in lib_obj:
				if obj.name.endswith('SPI.o'):
					env.PrependUnique(LIBS = [File(obj)])
		else:
			env.AppendUnique(LIBS = [File(lib_a[0])])
	else:
		env.PrependUnique(LIBS = [File(lib_a[0])])

def __build_core(env):
	core_src = __search_files(core_folder, '*.S')
	core_src.extend(__search_files(core_folder, '*.c'))
	core_src.extend(__search_files(core_folder, '*.cpp'))

	core_src.extend(__search_files(variant_folder, '*.S'))
	core_src.extend(__search_files(variant_folder, '*.c'))
	core_src.extend(__search_files(variant_folder, '*.cpp'))

	core_obj = __src_to_obj(env, core_src)
	build_dir = env.get('BUILD_DIR')
	if build_dir:
		s_core = env.StaticLibrary(build_dir + 'core', core_obj)
	else:
		s_core = env.StaticLibrary('core', core_obj)
	env.AppendUnique(LIBS = [File(s_core[0])])

	# To avoid compiler issue. Otherewise there may be warnings:
	# 	undefined reference to '_exit' '_close', '_getpid' ...
	# Above functions are used in libc.a and implemented in syscalls_sam3.c
	if env.get('TARGET_ARCH') == 'arm':
		for obj in core_obj:
			if obj.name.endswith('syscalls_sam3.o'):
				env.AppendUnique(LIBS = [File(obj)])

def __create_bin(env, source):
	name = source
	if target_arch == 'avr':
		eep = env.Command(name + '.eep', source, 'avr-objcopy -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0 $SOURCE $TARGET')
		hex = env.Command(name + '.hex', source, 'avr-objcopy -O ihex -R .eeprom $SOURCE $TARGET')
	else:
		hex = env.Command(name + '.hex', source, 'arm-none-eabi-objcopy -O binary $SOURCE $TARGET')

#Currently Mega and Due build is supported.
def __upload(env, binary):
        if target_arch == 'avr':
                protocol = __get_board_info(board, '.upload.protocol')
                speed = __get_board_info(board, '.upload.speed')
                port = '/dev/ttyACM0'
                upload_cmd = arduino_home + '/hardware/tools/avr/bin/avrdude -C' + arduino_home +'/hardware/tools/avr/etc/avrdude.conf -v -v -v -v -p' \
                + mcu + ' -c' + protocol + ' -P' + port + ' -b' + speed + ' -D -Uflash:w:' + binary + ':i'

                print "Upload command: %s" %upload_cmd
                install_cmd = env.Command('install_cmd', None, upload_cmd)
                env.Default('install_cmd')
        else:
	        uu = __get_board_info(board, '.upload.native_usb')
                port = 'ttyACM0'
		upload_cmd = 'stty -F /dev/' + port + ' speed 1200 cs8 -cstopb -parenb \n' + arduino_home + '/hardware/tools/bossac -i -d --port=' + port + ' -U ' + uu + ' -e -w -v -b ' + binary + ' -R'
                print "Upload command: %s" %upload_cmd
                install_cmd = env.Command('install_cmd', None, upload_cmd)
                env.Default('install_cmd')

# Print the command line that to upload binary to the board
def __upload_help(env):
	if target_arch == 'avr':
		protocol = __get_board_info(board, '.upload.protocol')
		speed = __get_board_info(board, '.upload.speed')

		upload_cmd = arduino_home + '/hardware/tools/avr/bin/avrdude -C' + arduino_home +'/hardware/tools/avr/etc/avrdude.conf -v -v -v -v -p' \
	+ mcu + ' -c' + protocol + ' -P<serial_port>' + ' -b' + speed + ' -D -Uflash:w:<hex_file>:i'
	else:
		uu = __get_board_info(board, '.upload.native_usb')
		upload_cmd = arduino_home + '/hardware/tools/bossac -i -d --port=<serial_port> -U ' + uu + ' -e -w -v -b <bin file> -R'

	Help('''
===============================================================================
You can upload the bin file with following command line:
''')
	Help('\n   $ ' + upload_cmd)
	Help('''
\nPlease replace <xxx> according to the actual situation.
===============================================================================
''')

# ARDUINO_HOME build option
help_vars = Variables()
help_vars.Add(PathVariable('ARDUINO_HOME', 'ARDUINO root directory', os.environ.get('ARDUINO_HOME')))
help_vars.Update(env)
Help(help_vars.GenerateHelpText(env))

target_arch = env.get('TARGET_ARCH')
arduino_home = env.get('ARDUINO_HOME')
if not arduino_home:
	print '''
************************************* Error ***********************************
*   Arduino root directory isn't set, you can set enviornment variable        *
* ARDUINO_HOME or add it in command line as:                                  *
*      # scons ARDUINO_HOME=<path to arduino root directory> ...              *
*******************************************************************************
'''
	Exit(1)

# Overwrite suffixes and prefixes
if env['HOST_OS'] == 'win32':
	env['OBJSUFFIX'] = '.o'
	env['SHOBJSUFFIX'] = '.os'
	env['LIBPREFIX'] = 'lib'
	env['LIBSUFFIX'] = '.a'
	env['SHLIBPREFIX'] = 'lib'
	env['SHLIBSUFFIX'] = '.so'
	env['LIBPREFIXES'] = ['lib']
	env['LIBSUFFIXES'] = ['.a', '.so']
	env['PROGSUFFIX'] = ''
elif platform.system().lower() == 'darwin':
	env['SHLIBSUFFIX'] = '.so'
	env['LIBSUFFIXES'] = ['.a', '.so']
	env['PROGSUFFIX'] = ''

# Debug/release relative flags
if env.get('RELEASE'):
	env.AppendUnique(CCFLAGS = ['-Os'])
	env.AppendUnique(CPPDEFINES = ['NDEBUG'])
else:
	env.AppendUnique(CCFLAGS = ['-g'])

# BOARD / CPU option

# Get IDE version
if os.path.exists(arduino_home + '/lib/version.txt'):
	vf = open(arduino_home + '/lib/version.txt', 'r')
	version = vf.readline().replace('.', '')
else:
	print '''
************************************* Error ***********************************
* Can't find version file (lib/version.txt), please check if (%s)
* is arduino root directory.                                                  *
*******************************************************************************
''' % arduino_home
	Exit(1)

if version[0:2] == '10':
	is_1_0_x = True
	boards_info = __parse_config(arduino_home + '/hardware/arduino/boards.txt')
	env.PrependENVPath('PATH', arduino_home + '/hardware/tools/avr/bin/')
	env.Replace(CC = 'avr-gcc')
	env.Replace(CXX = 'avr-gcc')
	env.Replace(AR = 'avr-ar')
	env.Replace(AS = 'avr-as')
	env.Replace(LINK = 'avr-gcc')
	env.Replace(RANLIB = 'avr-ranlib')
	if target_arch != 'avr':
		print '''
************************************* Error ***********************************
* Arduino 1.0.x IDE only support 'avr', to support other arch at least 1.5.x  *
* is required.
*******************************************************************************
'''
		Exit(1)
else:
	is_1_0_x = False
	if target_arch == 'avr':
		boards_info = __parse_config(arduino_home + '/hardware/arduino/avr/boards.txt')
		platform_info = __parse_config(arduino_home + '/hardware/arduino/avr/platform.txt')
	elif target_arch == 'arm':
		boards_info = __parse_config(arduino_home + '/hardware/arduino/sam/boards.txt')
		platform_info = __parse_config(arduino_home + '/hardware/arduino/sam/platform.txt')
	else:
		print '''
************************************* Error ***********************************
* CPU arch %s isn't supported currently.
*******************************************************************************
''' % target_arch

#Board option, let user to select the board
boards = __get_boards(boards_info)
help_vars = Variables()
help_vars.Add(EnumVariable('BOARD', 'arduino board', boards[0], boards))
help_vars.Update(env)
Help(help_vars.GenerateHelpText(env))

#CPU option
board = env.get('BOARD')
cpus = __get_cpu(boards_info, board)
if len(cpus) > 0:
	help_vars = Variables()
	help_vars.Add(EnumVariable('CPU', 'arduino board cpu', cpus[0], cpus))
	help_vars.Update(env)
	Help(help_vars.GenerateHelpText(env))

# Arduino commom flags
cpu = env.get('CPU')
board = env.get('BOARD')
mcu = __get_board_info(board, '.build.mcu')
f_cpu = __get_board_info(board, '.build.f_cpu')
usb_vid = __get_board_info(board, '.build.vid')
usb_pid = __get_board_info(board, '.build.pid')
variant = __get_board_info(board, '.build.variant')

if not usb_vid:
	usb_vid = __get_board_info(board, '.vid.0')
if not usb_pid:
	usb_pid = __get_board_info(board, '.pid.0')

if is_1_0_x:
	core_base = arduino_home + '/hardware/arduino/'
else:
	if target_arch == 'avr':
		core_base = arduino_home + '/hardware/arduino/avr/'
	else:
		core_base = arduino_home + '/hardware/arduino/sam/'

variant_folder = core_base + 'variants/' + variant
env.AppendUnique(CPPPATH = [variant_folder])

core = __get_board_info(board, '.build.core')
core_folder = core_base + 'cores/' + core + '/'
env.AppendUnique(CPPPATH = [core_folder])

if is_1_0_x:
	comm_flags = ['-std=c99']
	if mcu:
		comm_flags.extend(['-mmcu=' + mcu])
	if f_cpu:
		comm_flags.extend(['-DF_CPU=' + f_cpu])
	comm_flags.extend(['-DARDUINO=' + version])
	if usb_vid:
		comm_flags.extend(['-DUSB_VID=' + usb_vid])
	if usb_pid:
		comm_flags.extend(['-DUSB_PID=' + usb_pid])

	env.AppendUnique(ASFLAGS = ['-x', 'assembler-with-cpp'])
	env.AppendUnique(ASFLAGS = comm_flags)

	env.AppendUnique(CFLAGS = ['-Os', '-ffunction-sections', '-fdata-sections', '-MMD'])
	env.AppendUnique(CFLAGS = comm_flags)

	env.AppendUnique(CXXFLAGS = ['-Os', '-fno-exceptions', '-ffunction-sections', '-fdata-sections','-MMD'])
	env.AppendUnique(CXXFLAGS = comm_flags)

	env.AppendUnique(LINKFLAGS = ['-Os'])
	if mcu == 'atmega2560':
		env.AppendUnique(LINKFLAGS = ['-Wl,--gc-sections,--relax'])
	else:
		env.AppendUnique(LINKFLAGS = ['-Wl,--gc-sections'])
	env.AppendUnique(LINKFLAGS = ['-mmcu=' + mcu])
else:
	if target_arch == 'avr':
		cpu_flag = '-mmcu=' + mcu
	else:
		cpu_flag = '-mcpu=' + mcu

	comm_flag = [cpu_flag, '-DF_CPU=' + f_cpu, '-DARDUINO=' + version, '-DARDUINO_' + __get_board_info(board, '.build.board')]
	if target_arch == 'arm':
		# As of 1.5.8 the arduino headers had asm bugs with ARM and
		# require gnu99 to be used.
		comm_flag.extend(['-std=gnu99', '-DARDUINO_ARCH_SAM'])
	else:
		comm_flag.extend(['-std=c99', '-DARDUINO_ARCH_AVR'])

	compiler_path = platform_info.get('compiler.path')
	compiler_path = compiler_path.replace('{runtime.ide.path}', arduino_home)
	env.PrependENVPath('PATH', compiler_path)
	env.Replace(CC = platform_info.get('compiler.c.cmd'))
	env.Replace(CXX = platform_info.get('compiler.cpp.cmd'))
	env.Replace(AR = platform_info.get('compiler.ar.cmd'))
	if target_arch == 'arm':
		env.AppendUnique(CPPPATH = [arduino_home + '/hardware/arduino/sam/system/libsam',
							arduino_home + '/hardware/arduino/sam/system/CMSIS/CMSIS/Include/',
							arduino_home + '/hardware/arduino/sam/system//CMSIS/Device/ATMEL'])
	env.AppendUnique(ASFLAGS = ['-x', 'assembler-with-cpp'])
	env.AppendUnique(ASFLAGS = comm_flag)
	env.AppendUnique(CFLAGS = Split(platform_info.get('compiler.c.flags')))
	env.AppendUnique(CXXFLAGS = Split(platform_info.get('compiler.cpp.flags')))
	env.AppendUnique(ARFLAGS = Split(platform_info.get('compiler.ar.flags')))
	env.AppendUnique(CCFLAGS = comm_flag)

	extra_flags = __get_board_info(board, '.build.extra_flags')
	if extra_flags:
		extra_flags = extra_flags.replace('{build.usb_flags}', '')
		env.AppendUnique(CCFLAGS = Split(extra_flags))
		usb_flags = ['-DUSB_VID=' + usb_vid, '-DUSB_PID=' + usb_pid, '-DUSBCON', '-DUSB_MANUFACTURER="Unknown"']
		env.AppendUnique(CCFLAGS = usb_flags)

	if target_arch == 'arm':
		env.AppendUnique(LINKFLAGS = ['-Os', '-Wl,--gc-sections', cpu_flag,
					'-T' + variant_folder + '/' + __get_board_info(board, '.build.ldscript'),
					'-Wl,-Map,' + env.get('BUILD_DIR') + 'arduino_prj.map'])
		env.AppendUnique(LINKFLAGS = Split('-lm -lgcc -mthumb -Wl,--cref -Wl,--check-sections -Wl,--gc-sections -Wl,--entry=Reset_Handler -Wl,--unresolved-symbols=report-all -Wl,--warn-common -Wl,--warn-section-align -Wl,--warn-unresolved-symbols -Wl,--start-group'))

		variant_system_lib = __get_board_info(board, '.build.variant_system_lib')
		if variant_system_lib:
			if variant_folder.find(' ') >= 0:
				variant_folder = '"' + variant_folder + '"'
			env.Replace(LINKCOM = '$LINK -o $TARGET $_LIBDIRFLAGS $LINKFLAGS $SOURCES $_LIBFLAGS '
					+ variant_folder + '/' + variant_system_lib + ' -Wl,--end-group')
		else:
			env.Replace(LINKCOM = '$LINK -o $TARGET $_LIBDIRFLAGS $LINKFLAGS $SOURCES $_LIBFLAGS -Wl,--end-group')
	else:
		env.AppendUnique(LINKFLAGS = Split(platform_info.get('compiler.c.elf.flags')))
		env.AppendUnique(LINKFLAGS = [cpu_flag])
		env.AppendUnique(LIBS = 'm')
	env.Replace(ARCOM = '$AR ' + platform_info.get('compiler.ar.flags') + ' $TARGET $SOURCES')

__build_core(env)

env.AddMethod(__import_lib, "ImportLib") #import arduino library
#env.AddMethod(__build_core, "BuildCore") #build arduino core
env.AddMethod(__create_bin, "CreateBin") #create binary files(.eep and .hex)
env.AddMethod(__upload, "Upload") #Upload binary to board
env.AddMethod(__upload_help, "UploadHelp") #print the command line that to upload binary to the boardf