#
# common-dependencies.py
# Convenience script to check dependencies and add libs and sources for Marlin Enabled Features
#
import subprocess,os,re

PIO_VERSION_MIN = (5, 0, 3)
try:
	from platformio import VERSION as PIO_VERSION
	weights = (1000, 100, 1)
	version_min = sum([x[0] * float(re.sub(r'[^0-9]', '.', str(x[1]))) for x in zip(weights, PIO_VERSION_MIN)])
	version_cur = sum([x[0] * float(re.sub(r'[^0-9]', '.', str(x[1]))) for x in zip(weights, PIO_VERSION)])
	if version_cur < version_min:
		print()
		print("**************************************************")
		print("******      An update to PlatformIO is      ******")
		print("******  required to build Marlin Firmware.  ******")
		print("******                                      ******")
		print("******      Minimum version: ", PIO_VERSION_MIN, "    ******")
		print("******      Current Version: ", PIO_VERSION, "    ******")
		print("******                                      ******")
		print("******   Update PlatformIO and try again.   ******")
		print("**************************************************")
		print()
		exit(1)
except SystemExit:
	exit(1)
except:
	print("Can't detect PlatformIO Version")

from platformio.package.meta import PackageSpec
from platformio.project.config import ProjectConfig

Import("env")

#print(env.Dump())

try:
	verbose = int(env.GetProjectOption('custom_verbose'))
except:
	verbose = 0

def blab(str,level=1):
	if verbose >= level:
		print("[deps] %s" % str)

FEATURE_CONFIG = {}

def add_to_feat_cnf(feature, flines):

	try:
		feat = FEATURE_CONFIG[feature]
	except:
		FEATURE_CONFIG[feature] = {}

	# Get a reference to the FEATURE_CONFIG under construction
	feat = FEATURE_CONFIG[feature]

	# Split up passed lines on commas or newlines and iterate
	# Add common options to the features config under construction
	# For lib_deps replace a previous instance of the same library
	atoms = re.sub(r',\\s*', '\n', flines).strip().split('\n')
	for line in atoms:
		parts = line.split('=')
		name = parts.pop(0)
		if name in ['build_flags', 'extra_scripts', 'src_filter', 'lib_ignore']:
			feat[name] = '='.join(parts)
			blab("[%s] %s=%s" % (feature, name, feat[name]), 3)
		else:
			for dep in re.split(r",\s*", line):
				lib_name = re.sub(r'@([~^]|[<>]=?)?[\d.]+', '', dep.strip()).split('=').pop(0)
				lib_re = re.compile('(?!^' + lib_name + '\\b)')
				feat['lib_deps'] = list(filter(lib_re.match, feat['lib_deps'])) + [dep]
				blab("[%s] lib_deps = %s" % (feature, dep), 3)

def load_config():
	blab("========== Gather [features] entries...")
	items = ProjectConfig().items('features')
	for key in items:
		feature = key[0].upper()
		if not feature in FEATURE_CONFIG:
			FEATURE_CONFIG[feature] = { 'lib_deps': [] }
		add_to_feat_cnf(feature, key[1])

	# Add options matching custom_marlin.MY_OPTION to the pile
	blab("========== Gather custom_marlin entries...")
	all_opts = env.GetProjectOptions()
	for n in all_opts:
		key = n[0]
		mat = re.match(r'custom_marlin\.(.+)', key)
		if mat:
			try:
				val = env.GetProjectOption(key)
			except:
				val = None
			if val:
				opt = mat.group(1).upper()
				blab("%s.custom_marlin.%s = '%s'" % ( env['PIOENV'], opt, val ))
				add_to_feat_cnf(opt, val)

def get_all_known_libs():
	known_libs = []
	for feature in FEATURE_CONFIG:
		feat = FEATURE_CONFIG[feature]
		if not 'lib_deps' in feat:
			continue
		for dep in feat['lib_deps']:
			known_libs.append(PackageSpec(dep).name)
	return known_libs

def get_all_env_libs():
	env_libs = []
	lib_deps = env.GetProjectOption('lib_deps')
	for dep in lib_deps:
		env_libs.append(PackageSpec(dep).name)
	return env_libs

def set_env_field(field, value):
	proj = env.GetProjectConfig()
	proj.set("env:" + env['PIOENV'], field, value)

# All unused libs should be ignored so that if a library
# exists in .pio/lib_deps it will not break compilation.
def force_ignore_unused_libs():
	env_libs = get_all_env_libs()
	known_libs = get_all_known_libs()
	diff = (list(set(known_libs) - set(env_libs)))
	lib_ignore = env.GetProjectOption('lib_ignore') + diff
	blab("Ignore libraries: %s" % lib_ignore)
	set_env_field('lib_ignore', lib_ignore)

def apply_features_config():
	load_config()
	blab("========== Apply enabled features...")
	for feature in FEATURE_CONFIG:
		if not env.MarlinFeatureIsEnabled(feature):
			continue

		feat = FEATURE_CONFIG[feature]

		if 'lib_deps' in feat and len(feat['lib_deps']):
			blab("========== Adding lib_deps for %s... " % feature, 2)

			# feat to add
			deps_to_add = {}
			for dep in feat['lib_deps']:
				deps_to_add[PackageSpec(dep).name] = dep
				blab("==================== %s... " % dep, 2)

			# Does the env already have the dependency?
			deps = env.GetProjectOption('lib_deps')
			for dep in deps:
				name = PackageSpec(dep).name
				if name in deps_to_add:
					del deps_to_add[name]

			# Are there any libraries that should be ignored?
			lib_ignore = env.GetProjectOption('lib_ignore')
			for dep in deps:
				name = PackageSpec(dep).name
				if name in deps_to_add:
					del deps_to_add[name]

			# Is there anything left?
			if len(deps_to_add) > 0:
				# Only add the missing dependencies
				set_env_field('lib_deps', deps + list(deps_to_add.values()))

		if 'build_flags' in feat:
			f = feat['build_flags']
			blab("========== Adding build_flags for %s: %s" % (feature, f), 2)
			new_flags = env.GetProjectOption('build_flags') + [ f ]
			env.Replace(BUILD_FLAGS=new_flags)

		if 'extra_scripts' in feat:
			blab("Running extra_scripts for %s... " % feature, 2)
			env.SConscript(feat['extra_scripts'], exports="env")

		if 'src_filter' in feat:
			blab("========== Adding src_filter for %s... " % feature, 2)
			src_filter = ' '.join(env.GetProjectOption('src_filter'))
			# first we need to remove the references to the same folder
			my_srcs = re.findall(r'[+-](<.*?>)', feat['src_filter'])
			cur_srcs = re.findall(r'[+-](<.*?>)', src_filter)
			for d in my_srcs:
				if d in cur_srcs:
					src_filter = re.sub(r'[+-]' + d, '', src_filter)

			src_filter = feat['src_filter'] + ' ' + src_filter
			set_env_field('src_filter', [src_filter])
			env.Replace(SRC_FILTER=src_filter)

		if 'lib_ignore' in feat:
			blab("========== Adding lib_ignore for %s... " % feature, 2)
			lib_ignore = env.GetProjectOption('lib_ignore') + [feat['lib_ignore']]
			set_env_field('lib_ignore', lib_ignore)

#
# Find a compiler, considering the OS
#
ENV_BUILD_PATH = os.path.join(env.Dictionary('PROJECT_BUILD_DIR'), env['PIOENV'])
GCC_PATH_CACHE = os.path.join(ENV_BUILD_PATH, ".gcc_path")
def search_compiler():
	try:
		filepath = env.GetProjectOption('custom_gcc')
		blab("Getting compiler from env")
		return filepath
	except:
		pass

	if os.path.exists(GCC_PATH_CACHE):
		with open(GCC_PATH_CACHE, 'r') as f:
			return f.read()

	# Find the current platform compiler by searching the $PATH
	# which will be in a platformio toolchain bin folder
	path_regex = re.escape(env['PROJECT_PACKAGES_DIR'])
	gcc = "g++"
	if env['PLATFORM'] == 'win32':
		path_separator = ';'
		path_regex += r'.*\\bin'
		gcc += ".exe"
	else:
		path_separator = ':'
		path_regex += r'/.+/bin'

	# Search for the compiler
	for pathdir in env['ENV']['PATH'].split(path_separator):
		if not re.search(path_regex, pathdir, re.IGNORECASE):
			continue
		for filepath in os.listdir(pathdir):
			if not filepath.endswith(gcc):
				continue
			# Use entire path to not rely on env PATH
			filepath = os.path.sep.join([pathdir, filepath])
			# Cache the g++ path to no search always
			if os.path.exists(ENV_BUILD_PATH):
				with open(GCC_PATH_CACHE, 'w+') as f:
					f.write(filepath)

			return filepath

	filepath = env.get('CXX')
	blab("Couldn't find a compiler! Fallback to %s" % filepath)
	return filepath

#
# Use the compiler to get a list of all enabled features
#
def load_marlin_features():
	if 'MARLIN_FEATURES' in env:
		return

	# Process defines
	build_flags = env.get('BUILD_FLAGS')
	build_flags = env.ParseFlagsExtended(build_flags)

	cxx = search_compiler()
	cmd = ['"' + cxx + '"']

	# Build flags from board.json
	#if 'BOARD' in env:
	#	cmd += [env.BoardConfig().get("build.extra_flags")]
	for s in build_flags['CPPDEFINES']:
		if isinstance(s, tuple):
			cmd += ['-D' + s[0] + '=' + str(s[1])]
		else:
			cmd += ['-D' + s]

	cmd += ['-D__MARLIN_DEPS__ -w -dM -E -x c++ buildroot/share/PlatformIO/scripts/common-dependencies.h']
	cmd = ' '.join(cmd)
	blab(cmd, 4)
	define_list = subprocess.check_output(cmd, shell=True).splitlines()
	marlin_features = {}
	for define in define_list:
		feature = define[8:].strip().decode().split(' ')
		feature, definition = feature[0], ' '.join(feature[1:])
		marlin_features[feature] = definition
	env['MARLIN_FEATURES'] = marlin_features

#
# Return True if a matching feature is enabled
#
def MarlinFeatureIsEnabled(env, feature):
	load_marlin_features()
	r = re.compile('^' + feature + '$')
	found = list(filter(r.match, env['MARLIN_FEATURES']))

	# Defines could still be 'false' or '0', so check
	some_on = False
	if len(found):
		for f in found:
			val = env['MARLIN_FEATURES'][f]
			if val in [ '', '1', 'true' ]:
				some_on = True
			elif val in env['MARLIN_FEATURES']:
				some_on = env.MarlinFeatureIsEnabled(val)

	return some_on

#
# Add a method for other PIO scripts to query enabled features
#
env.AddMethod(MarlinFeatureIsEnabled)

#
# Add dependencies for enabled Marlin features
#
apply_features_config()
force_ignore_unused_libs()
