# Copyright 2010-2014 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

__all__ = (
	'KeywordsManager',
)

from _emerge.Package import Package
from portage import os
from portage.dep import ExtendedAtomDict, _repo_separator, _slot_separator
from portage.localization import _
from portage.package.ebuild._config.helper import ordered_by_atom_specificity
from portage.util import grabdict_package, stack_lists, writemsg
from portage.versions import _pkg_str

class KeywordsManager(object):
	"""Manager class to handle keywords processing and validation"""

	def __init__(self, profiles, abs_user_config, user_config=True,
				global_accept_keywords=""):
		self._pkeywords_list = []
		rawpkeywords = [grabdict_package(
			os.path.join(x.location, "package.keywords"),
			recursive=x.portage1_directories,
			verify_eapi=True, eapi=x.eapi, eapi_default=None,
			allow_build_id=x.allow_build_id)
			for x in profiles]
		for pkeyworddict in rawpkeywords:
			if not pkeyworddict:
				# Omit non-existent files from the stack.
				continue
			cpdict = {}
			for k, v in pkeyworddict.items():
				cpdict.setdefault(k.cp, {})[k] = v
			self._pkeywords_list.append(cpdict)
		self._pkeywords_list = tuple(self._pkeywords_list)

		self._p_accept_keywords = []
		raw_p_accept_keywords = [grabdict_package(
			os.path.join(x.location, "package.accept_keywords"),
			recursive=x.portage1_directories,
			verify_eapi=True, eapi=x.eapi, eapi_default=None)
			for x in profiles]
		for d in raw_p_accept_keywords:
			if not d:
				# Omit non-existent files from the stack.
				continue
			cpdict = {}
			for k, v in d.items():
				cpdict.setdefault(k.cp, {})[k] = tuple(v)
			self._p_accept_keywords.append(cpdict)
		self._p_accept_keywords = tuple(self._p_accept_keywords)

		self.pkeywordsdict = ExtendedAtomDict(dict)

		if user_config:
			pkgdict = grabdict_package(
				os.path.join(abs_user_config, "package.keywords"),
				recursive=1, allow_wildcard=True, allow_repo=True,
				verify_eapi=False, allow_build_id=True)

			for k, v in grabdict_package(
				os.path.join(abs_user_config, "package.accept_keywords"),
				recursive=1, allow_wildcard=True, allow_repo=True,
				verify_eapi=False, allow_build_id=True).items():
				pkgdict.setdefault(k, []).extend(v)

			accept_keywords_defaults = global_accept_keywords.split()
			accept_keywords_defaults = tuple('~' + keyword for keyword in \
				accept_keywords_defaults if keyword[:1] not in "~-")
			for k, v in pkgdict.items():
				# default to ~arch if no specific keyword is given
				if not v:
					v = accept_keywords_defaults
				else:
					v = tuple(v)
				self.pkeywordsdict.setdefault(k.cp, {})[k] = v


	def getKeywords(self, cpv, slot, keywords, repo):
		try:
			cpv.slot
		except AttributeError:
			pkg = _pkg_str(cpv, slot=slot, repo=repo)
		else:
			pkg = cpv
		cp = pkg.cp
		keywords = [[x for x in keywords.split() if x != "-*"]]
		for pkeywords_dict in self._pkeywords_list:
			cpdict = pkeywords_dict.get(cp)
			if cpdict:
				pkg_keywords = ordered_by_atom_specificity(cpdict, pkg)
				if pkg_keywords:
					keywords.extend(pkg_keywords)
		return stack_lists(keywords, incremental=True)

	def isStable(self, pkg, global_accept_keywords, backuped_accept_keywords):
		mygroups = self.getKeywords(pkg, None, pkg._metadata["KEYWORDS"], None)
		pgroups = global_accept_keywords.split()

		unmaskgroups = self.getPKeywords(pkg, None, None,
			global_accept_keywords)
		pgroups.extend(unmaskgroups)

		egroups = backuped_accept_keywords.split()

		if unmaskgroups or egroups:
			pgroups = self._getEgroups(egroups, pgroups)
		else:
			pgroups = set(pgroups)

		if self._getMissingKeywords(pkg, pgroups, mygroups):
			return False

		# If replacing all keywords with unstable variants would mask the
		# package, then it's considered stable for the purposes of
		# use.stable.mask/force interpretation. For unstable configurations,
		# this guarantees that the effective use.force/mask settings for a
		# particular ebuild do not change when that ebuild is stabilized.
		unstable = []
		for kw in mygroups:
			if kw[:1] != "~":
				kw = "~" + kw
			unstable.append(kw)

		return bool(self._getMissingKeywords(pkg, pgroups, set(unstable)))

	def getMissingKeywords(self,
							cpv,
							slot,
							keywords,
							repo,
							global_accept_keywords,
							backuped_accept_keywords):
		"""
		Take a package and return a list of any KEYWORDS that the user may
		need to accept for the given package. If the KEYWORDS are empty
		and the the ** keyword has not been accepted, the returned list will
		contain ** alone (in order to distinguish from the case of "none
		missing").

		@param cpv: The package name (for package.keywords support)
		@type cpv: String
		@param slot: The 'SLOT' key from the raw package metadata
		@type slot: String
		@param keywords: The 'KEYWORDS' key from the raw package metadata
		@type keywords: String
		@param global_accept_keywords: The current value of ACCEPT_KEYWORDS
		@type global_accept_keywords: String
		@param backuped_accept_keywords: ACCEPT_KEYWORDS from the backup env
		@type backuped_accept_keywords: String
		@rtype: List
		@return: A list of KEYWORDS that have not been accepted.
		"""

		mygroups = self.getKeywords(cpv, slot, keywords, repo)
		# Repoman may modify this attribute as necessary.
		pgroups = global_accept_keywords.split()

		unmaskgroups = self.getPKeywords(cpv, slot, repo,
				global_accept_keywords)
		pgroups.extend(unmaskgroups)

		# Hack: Need to check the env directly here as otherwise stacking
		# doesn't work properly as negative values are lost in the config
		# object (bug #139600)
		egroups = backuped_accept_keywords.split()

		if unmaskgroups or egroups:
			pgroups = self._getEgroups(egroups, pgroups)
		else:
			pgroups = set(pgroups)

		return self._getMissingKeywords(cpv, pgroups, mygroups)


	def getRawMissingKeywords(self,
							cpv,
							slot,
							keywords,
							repo,
							global_accept_keywords):
		"""
		Take a package and return a list of any KEYWORDS that the user may
		need to accept for the given package. If the KEYWORDS are empty,
		the returned list will contain ** alone (in order to distinguish
		from the case of "none missing").  This DOES NOT apply any user config
		package.accept_keywords acceptance.

		@param cpv: The package name (for package.keywords support)
		@type cpv: String
		@param slot: The 'SLOT' key from the raw package metadata
		@type slot: String
		@param keywords: The 'KEYWORDS' key from the raw package metadata
		@type keywords: String
		@param global_accept_keywords: The current value of ACCEPT_KEYWORDS
		@type global_accept_keywords: String
		@rtype: List
		@return: lists of KEYWORDS that have not been accepted
		and the keywords it looked for.
		"""

		mygroups = self.getKeywords(cpv, slot, keywords, repo)
		pgroups = global_accept_keywords.split()
		pgroups = set(pgroups)
		return self._getMissingKeywords(cpv, pgroups, mygroups)


	@staticmethod
	def _getEgroups(egroups, mygroups):
		"""gets any keywords defined in the environment

		@param backuped_accept_keywords: ACCEPT_KEYWORDS from the backup env
		@type backuped_accept_keywords: String
		@rtype: List
		@return: list of KEYWORDS that have been accepted
		"""
		mygroups = list(mygroups)
		mygroups.extend(egroups)
		inc_pgroups = set()
		for x in mygroups:
			if x[:1] == "-":
				if x == "-*":
					inc_pgroups.clear()
				else:
					inc_pgroups.discard(x[1:])
			else:
				inc_pgroups.add(x)
		return inc_pgroups


	@staticmethod
	def _getMissingKeywords(cpv, pgroups, mygroups):
		"""Determines the missing keywords

		@param pgroups: The pkg keywords accepted
		@type pgroups: list
		@param mygroups: The ebuild keywords
		@type mygroups: list
		"""
		match = False
		hasstable = False
		hastesting = False
		for gp in mygroups:
			if gp == "*":
				match = True
				break
			elif gp == "~*":
				hastesting = True
				for x in pgroups:
					if x[:1] == "~":
						match = True
						break
				if match:
					break
			elif gp in pgroups:
				match = True
				break
			elif gp.startswith("~"):
				hastesting = True
			elif not gp.startswith("-"):
				hasstable = True
		if not match and \
			((hastesting and "~*" in pgroups) or \
			(hasstable and "*" in pgroups) or "**" in pgroups):
			match = True
		if match:
			missing = []
		else:
			if not mygroups:
				# If KEYWORDS is empty then we still have to return something
				# in order to distinguish from the case of "none missing".
				mygroups = ["**"]
			missing = mygroups
		return missing


	def getPKeywords(self, cpv, slot, repo, global_accept_keywords):
		"""Gets any package.keywords settings for cp for the given
		cpv, slot and repo

		@param cpv: The package name (for package.keywords support)
		@type cpv: String
		@param slot: The 'SLOT' key from the raw package metadata
		@type slot: String
		@param keywords: The 'KEYWORDS' key from the raw package metadata
		@type keywords: String
		@param global_accept_keywords: The current value of ACCEPT_KEYWORDS
		@type global_accept_keywords: String
		@param backuped_accept_keywords: ACCEPT_KEYWORDS from the backup env
		@type backuped_accept_keywords: String
		@rtype: List
		@return: list of KEYWORDS that have been accepted
		"""

		pgroups = global_accept_keywords.split()
		try:
			cpv.slot
		except AttributeError:
			cpv = _pkg_str(cpv, slot=slot, repo=repo)
		cp = cpv.cp

		unmaskgroups = []
		if self._p_accept_keywords:
			accept_keywords_defaults = tuple('~' + keyword for keyword in \
				pgroups if keyword[:1] not in "~-")
			for d in self._p_accept_keywords:
				cpdict = d.get(cp)
				if cpdict:
					pkg_accept_keywords = \
						ordered_by_atom_specificity(cpdict, cpv)
					if pkg_accept_keywords:
						for x in pkg_accept_keywords:
							if not x:
								x = accept_keywords_defaults
							unmaskgroups.extend(x)

		pkgdict = self.pkeywordsdict.get(cp)
		if pkgdict:
			pkg_accept_keywords = \
				ordered_by_atom_specificity(pkgdict, cpv)
			if pkg_accept_keywords:
				for x in pkg_accept_keywords:
					unmaskgroups.extend(x)
		return unmaskgroups