# decompiler.py
#
# Copyright 2021 James Westman <james@jwestman.net>
#
# This file is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 3 of the
# License, or (at your option) any later version.
#
# This file is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# SPDX-License-Identifier: LGPL-3.0-or-later

from enum import Enum

from . import tokenizer

OPENING_TOKENS = ["{", "["]
CLOSING_TOKENS = ["}", "]"]

NEWLINE_AFTER = [";"] + OPENING_TOKENS + CLOSING_TOKENS

NO_WHITESPACE_BEFORE = [",", ":", ";", ")", "."]
NO_WHITESPACE_AFTER = ["C_", "_", "("]

WHITESPACE_AFTER = [":", ","]
WHITESPACE_BEFORE = ["{"]


class LineType(Enum):
    STATEMENT = 0
    BLOCK_OPEN = 1
    BLOCK_CLOSE = 2
    CHILD_TYPE = 3


class Format:
    def format(data):
        indent_levels = 0
        tokens = tokenizer.tokenize(data)
        tokenized_str = ""
        last_not_whitespace = None  # To make line 56 not fail
        current_line = ""
        prev_line_type = None

        for item in tokens:
            if item.type != tokenizer.TokenType.WHITESPACE:
                item_as_string = str(item)

                if item_as_string in WHITESPACE_BEFORE:
                    current_line = current_line.strip() + " "
                elif (
                    item_as_string in NO_WHITESPACE_BEFORE
                    or str(last_not_whitespace) in NO_WHITESPACE_AFTER
                ):
                    current_line = current_line.strip()

                current_line += item_as_string

                if (
                    item_as_string in NEWLINE_AFTER
                    or item.type == tokenizer.TokenType.COMMENT
                ):
                    if item_as_string in OPENING_TOKENS:
                        # tokenized_str += (
                        #     ("\n" * num_newlines) + (indent_levels * "  ") + current_line
                        # )
                        # current_line = ""
                        num_newlines = 1 if prev_line_type == LineType.CHILD_TYPE else 2
                        prev_line_type = LineType.BLOCK_OPEN
                        tokenized_str = (
                            tokenized_str.strip()
                            + (num_newlines * "\n")
                            + (indent_levels * "  ")
                        )

                        indent_levels += 1
                    elif item_as_string in CLOSING_TOKENS:
                        indent_levels -= 1
                        tokenized_str = (
                            tokenized_str.strip() + "\n" + (indent_levels * "  ")
                        )

                        # tokenized_str += current_line
                        # current_line = ""

                        # prev_line_type = (
                        #     LineType.CHILD_TYPE
                        #     if current_line.strip().startswith("[")
                        #     else LineType.BLOCK_CLOSE
                        # )

                    current_line += "\n" + (indent_levels * "  ")
                    tokenized_str += current_line
                    current_line = ""

                elif (
                    item_as_string in WHITESPACE_AFTER
                    or item.type == tokenizer.TokenType.IDENT
                ):
                    current_line += " "

                last_not_whitespace = item

            # else:
            #     current_line = current_line.strip() + " "

        tokenized_str = "\n".join(
            ["" if s.strip() == "" else s for s in tokenized_str.splitlines()]
        )

        print(tokenized_str)  # TODO: Remove this when the MR is ready to be merged

        return tokenized_str