# =============================================================================
#               ____ _   _ ____  _          _
#  _ __  _   _ / ___| | | |  _ \| |      __| | ___  _ __ ___
# | '_ \| | | | |  _| |_| | | | | |     / _` |/ _ \| '_ ` _ \
# | |_) | |_| | |_| |  _  | |_| | |___ | (_| | (_) | | | | | |
# | .__/ \__, |\____|_| |_|____/|_____(_)__,_|\___/|_| |_| |_|
# |_|    |___/
# =============================================================================
# Authors:
#   Patrick Lehmann
#
# Package package:  Document object model (DOM) for pyGHDL.libghdl.
#
# License:
# ============================================================================
#  Copyright (C) 2019-2021 Tristan Gingold
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 2 of the License, or
#  (at your option) any later version.
#
#  This program 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 General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <gnu.org/licenses>.
#
# SPDX-License-Identifier: GPL-2.0-or-later
# ============================================================================
from pathlib import Path

from pydecor import export

from pyGHDL import GHDLBaseException
from pyGHDL.libghdl import files_map, name_table
from pyGHDL.libghdl._types import Iir
from pyGHDL.libghdl.vhdl import nodes

__all__ = []


@export
class Position:
    """Represents the source code position of a IIR node in a source file."""

    _filename: Path
    _line: int
    _column: int

    def __init__(self, filename: Path, line: int, column: int):
        self._filename = filename
        self._line = line
        self._column = column

    @classmethod
    def parse(cls, node: Iir) -> "Position":
        """Return the source code position of a IIR node."""
        if node == nodes.Null_Iir:
            raise ValueError("Position.parse(): Parameter 'node' must not be 'Null_iir'.")

        location = nodes.Get_Location(node)
        file = files_map.Location_To_File(location)
        fileNameId = files_map.Get_File_Name(file)
        fileName = name_table.Get_Name_Ptr(fileNameId)
        line = files_map.Location_File_To_Line(location, file)
        column = files_map.Location_File_Line_To_Offset(location, file, line)

        return cls(Path(fileName), line, column)

    @property
    def Filename(self) -> Path:
        return self._filename

    @property
    def Line(self) -> int:
        return self._line

    @property
    def Column(self) -> int:
        return self._column

    def __str__(self):
        return "{file}:{line}:{column}".format(file=self._filename, line=self._line, column=self._column)


@export
class DOMMixin:
    _iirNode: Iir
    _position: Position = None

    def __init__(self, node: Iir):
        self._iirNode = node

    @property
    def Position(self) -> Position:
        if self._position is None:
            self._position = Position.parse(self._iirNode)

        return self._position


@export
class DOMException(GHDLBaseException):
    pass