# ==================================================================================================================== #
#            __     ___   _ ____  _     ____                                                                           #
#  _ __  _   \ \   / / | | |  _ \| |   |  _ \ __ _ _ __ ___  ___ _ __                                                  #
# | '_ \| | | \ \ / /| |_| | | | | |   | |_) / _` | '__/ __|/ _ \ '__|                                                 #
# | |_) | |_| |\ V / |  _  | |_| | |___|  __/ (_| | |  \__ \  __/ |                                                    #
# | .__/ \__, | \_/  |_| |_|____/|_____|_|   \__,_|_|  |___/\___|_|                                                    #
# |_|    |___/                                                                                                         #
# ==================================================================================================================== #
# Authors:                                                                                                             #
#   Patrick Lehmann                                                                                                    #
#                                                                                                                      #
# License:                                                                                                             #
# ==================================================================================================================== #
# Copyright 2017-2021 Patrick Lehmann - Boetzingen, Germany                                                            #
# Copyright 2016-2017 Patrick Lehmann - Dresden, Germany                                                               #
#                                                                                                                      #
# Licensed under the Apache License, Version 2.0 (the "License");                                                      #
# you may not use this file except in compliance with the License.                                                     #
# You may obtain a copy of the License at                                                                              #
#                                                                                                                      #
#   http://www.apache.org/licenses/LICENSE-2.0                                                                         #
#                                                                                                                      #
# Unless required by applicable law or agreed to in writing, software                                                  #
# distributed under the License is distributed on an "AS IS" BASIS,                                                    #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.                                             #
# See the License for the specific language governing permissions and                                                  #
# limitations under the License.                                                                                       #
# ==================================================================================================================== #
#
from pathlib import Path

from pyAttributes.ArgParseAttributes import CommandAttribute

from ..Base                   import ParserException
from ..Token                  import Token, StartOfDocumentToken, EndOfDocumentToken
from ..Token.Parser           import Tokenizer
from ..Blocks                 import TokenToBlockParser, Block, StartOfDocumentBlock, EndOfDocumentBlock, CommentBlock
from ..Blocks.Common          import LinebreakBlock, IndentationBlock
from ..Blocks.List            import GenericList, PortList
from ..Blocks.InterfaceObject import InterfaceConstantBlock, InterfaceSignalBlock
from ..Blocks.Structural      import Entity

from .                        import FrontEndProtocol, FilenameAttribute, WithTokensAttribute


class BlockStreamHandlers:
	# ----------------------------------------------------------------------------
	# create the sub-parser for the "block-stream" command
	# ----------------------------------------------------------------------------
	@CommandAttribute("block-stream", help="Create a stream of block objects.", description="Create a stream of block objects.")
	@WithTokensAttribute()
	@FilenameAttribute()
	def HandleBlockStreaming(self: FrontEndProtocol, args):
		self.PrintHeadline()

		file = Path(args.Filename)

		if (not file.exists()):
			print("File '{0!s}' does not exist.".format(file))

		with file.open('r') as fileHandle:
			content = fileHandle.read()

		tokenStream = Tokenizer.GetVHDLTokenizer(content)
		blockStream = TokenToBlockParser.Transform(tokenStream)

		try:
			for block in blockStream:
				if isinstance(block, (LinebreakBlock, IndentationBlock)):
					self.WriteNormal("{DARK_GRAY}{block!r}{NOCOLOR}".format(block=block, **self.Foreground))
				elif isinstance(block, CommentBlock):
					self.WriteNormal("{DARK_GREEN}{block!r}{NOCOLOR}".format(block=block, **self.Foreground))
				elif isinstance(block, (Entity.NameBlock, Entity.NameBlock, Entity.EndBlock)):
					self.WriteNormal("{DARK_RED}{block!r}{NOCOLOR}".format(block=block, **self.Foreground))
				elif isinstance(block, (GenericList.OpenBlock, GenericList.DelimiterBlock, GenericList.CloseBlock)):
					self.WriteNormal("{DARK_BLUE}{block!r}{NOCOLOR}".format(block=block, **self.Foreground))
				elif isinstance(block, (PortList.OpenBlock, PortList.DelimiterBlock, PortList.CloseBlock)):
					self.WriteNormal("{DARK_CYAN}{block!r}{NOCOLOR}".format(block=block, **self.Foreground))
				elif isinstance(block, (InterfaceConstantBlock, InterfaceSignalBlock)):
					self.WriteNormal("{BLUE}{block!r}{NOCOLOR}".format(block=block, **self.Foreground))
				else:
					self.WriteNormal("{YELLOW}{block!r}{NOCOLOR}".format(block=block, **self.Foreground))

				for token in block:
					self.WriteVerbose(repr(token))

		except ParserException as ex:
			print("{RED}ERROR: {0!s}{NOCOLOR}".format(ex, **self.Foreground))
		except NotImplementedError as ex:
			print("{RED}NotImplementedError: {0!s}{NOCOLOR}".format(ex, **self.Foreground))

		self.exit()

	# ----------------------------------------------------------------------------
	# create the sub-parser for the "block-check" command
	# ----------------------------------------------------------------------------
	@CommandAttribute("block-check", help="Check a stream of block objects.", description="Check a stream of block objects.")
	@WithTokensAttribute()
	@FilenameAttribute()
	def HandleCheckBlockStreaming(self: FrontEndProtocol, args):
		self.PrintHeadline()

		file = Path(args.Filename)

		if (not file.exists()):
			print("File '{0!s}' does not exist.".format(file))

		with file.open('r') as fileHandle:
			content = fileHandle.read()

		vhdlTokenStream = Tokenizer.GetVHDLTokenizer(content)
		vhdlBlockStream = TokenToBlockParser.Transform(vhdlTokenStream)

		try:
			blockIterator = iter(vhdlBlockStream)
			firstBlock = next(blockIterator)
			self.WriteVerbose(str(firstBlock))

			if (not isinstance(firstBlock, StartOfDocumentBlock)):
				self.WriteError("{RED}First block is not StartOfDocumentBlock: {block}{NOCOLOR}".format(block=firstBlock, **self.Foreground))
				self.WriteError("{YELLOW}  Block:  {block}{NOCOLOR}".format(block=firstBlock, **self.Foreground))
			startToken = firstBlock.StartToken
			self.WriteDebug(str(startToken))
			if (not isinstance(startToken, StartOfDocumentToken)):
				self.WriteError("{RED}First token is not StartOfDocumentToken: {token}{NOCOLOR}".format(token=startToken, **self.Foreground))
				self.WriteError("{YELLOW}  Token:  {token}{NOCOLOR}".format(token=startToken, **self.Foreground))

			lastBlock: Block = firstBlock
			endBlock: Block = None
			lastToken: Token = startToken

			for vhdlBlock in blockIterator:
				self.WriteNormal(str(vhdlBlock))

				if isinstance(vhdlBlock, EndOfDocumentBlock):
					self.WriteDebug("{GREEN}Found EndOfDocumentBlock...{NOCOLOR}".format(**self.Foreground))
					endBlock = vhdlBlock
					break

				tokenIterator = iter(vhdlBlock)

				for token in tokenIterator:
					self.WriteVerbose(str(token))

					#					if (token.NextToken is None):
					#						self.WriteError("{RED}Token has an open end (NextToken).{NOCOLOR}".format(**self.Foreground))
					#						self.WriteError("{YELLOW}  Token:  {token}{NOCOLOR}".format(token=token, **self.Foreground))
					#					el
					if (lastToken.NextToken is not token):
						self.WriteError("{RED}Last token is not connected to the current token.{NOCOLOR}".format(**self.Foreground))
						self.WriteError("{YELLOW}  Last:   {token!s}{NOCOLOR}".format(token=lastToken, **self.Foreground))
						self.WriteError("{YELLOW}    Next: {token!s}{NOCOLOR}".format(token=lastToken.NextToken, **self.Foreground))
						self.WriteError("")
						self.WriteError("{YELLOW}  Cur.:   {token!s}{NOCOLOR}".format(token=token, **self.Foreground))
						self.WriteError("")

					if (token.PreviousToken is None):
						self.WriteError("{RED}Token has an open end (PreviousToken).{NOCOLOR}".format(**self.Foreground))
						self.WriteError("{YELLOW}  Token:  {token}{NOCOLOR}".format(token=token, **self.Foreground))
					elif (token.PreviousToken is not lastToken):
						print("{RED}Current token is not connected to lastToken.{NOCOLOR}".format(**self.Foreground))
						# print("{RED}  Block:  {block}{NOCOLOR}".format(block=vhdlBlock, **self.Foreground))
						print("{YELLOW}  Cur.:   {token}{NOCOLOR}".format(token=token, **self.Foreground))
						print("{YELLOW}    Prev: {token}{NOCOLOR}".format(token=token.PreviousToken, **self.Foreground))
						self.WriteError("")
						print("{YELLOW}  Last:   {token}{NOCOLOR}".format(token=lastToken, **self.Foreground))
						print("{YELLOW}    Next: {token}{NOCOLOR}".format(token=lastToken.NextToken, **self.Foreground))
						self.WriteError("")

					lastToken = token

				lastBlock = vhdlBlock
			else:
				self.WriteError("{RED}No EndOfDocumentBlock found.{NOCOLOR}".format(**self.Foreground))

			if (not isinstance(endBlock, EndOfDocumentBlock)):
				self.WriteError("{RED}Last block is not EndOfDocumentBlock: {block}{NOCOLOR}".format(block=endBlock, **self.Foreground))
				self.WriteError("{YELLOW}  Block:  {block}{NOCOLOR}".format(block=firstBlock, **self.Foreground))
			elif (not isinstance(endBlock.EndToken, EndOfDocumentToken)):
				self.WriteError("{RED}Last token is not EndOfDocumentToken: {token}{NOCOLOR}".format(token=endBlock.EndToken, **self.Foreground))
				self.WriteError("{YELLOW}  Token:  {token}{NOCOLOR}".format(token=endBlock.EndToken, **self.Foreground))

		except ParserException as ex:
			print("{RED}ERROR: {0!s}{NOCOLOR}".format(ex, **self.Foreground))
		except NotImplementedError as ex:
			print("{RED}NotImplementedError: {0!s}{NOCOLOR}".format(ex, **self.Foreground))

		self.WriteNormal("")
		self.WriteNormal("{CYAN}All checks are done.{NOCOLOR}".format(**self.Foreground))
		self.exit()
