#!/usr/bin/env python3
# =============================================================================
#               ____ _   _ ____  _          _
#  _ __  _   _ / ___| | | |  _ \| |      __| | ___  _ __ ___
# | '_ \| | | | |  _| |_| | | | | |     / _` |/ _ \| '_ ` _ \
# | |_) | |_| | |_| |  _  | |_| | |___ | (_| | (_) | | | | | |
# | .__/ \__, |\____|_| |_|____/|_____(_)__,_|\___/|_| |_| |_|
# |_|    |___/
# =============================================================================
# Authors:
#   Patrick Lehmann
#   Unai Martinez-Corral
#
# Package module:   DOM: Interface items (e.g. generic or port)
#
# 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 argparse import RawDescriptionHelpFormatter
from pathlib import Path
from platform import system as platform_system
from textwrap import wrap, dedent

from pyGHDL.dom import DOMException

from pyGHDL.libghdl import LibGHDLException
from pyTooling.Decorators import export
from pyTooling.TerminalUI import LineTerminal, Severity
from pyAttributes import Attribute
from pyAttributes.ArgParseAttributes import (
    ArgParseMixin,
    CommonSwitchArgumentAttribute,
    DefaultAttribute,
    CommandAttribute,
    ArgumentAttribute,
    SwitchArgumentAttribute,
)

from pyGHDL import GHDLBaseException
from pyGHDL.dom.NonStandard import Design, Document
from pyGHDL.dom.formatting.prettyprint import PrettyPrint, PrettyPrintException

__author__ = "Tristan Gingold"
__copyright__ = "Copyright (C) 2019-2021 Tristan Gingold"
__maintainer__ = "Tristan Gingold"
__email__ = ""
__version__ = "0.0.0"
__status__ = "Alpha"
__license__ = ""


class SourceAttribute(Attribute):
    def __call__(self, func):
        self._AppendAttribute(
            func,
            ArgumentAttribute(
                "-f",
                "--file",
                action="append",
                metavar="file",
                dest="Files",
                type=Path,
                help="The filename to parse (can be used multiple times).",
            ),
        )
        self._AppendAttribute(
            func,
            ArgumentAttribute(
                "-F",
                "--files",
                metavar="files",
                dest="Files",
                type=Path,
                nargs="+",
                help="List of filenames to parse.",
            ),
        )
        self._AppendAttribute(
            func,
            ArgumentAttribute(
                "-D",
                "--directory",
                metavar="dir",
                dest="Directory",
                type=Path,
                help="The directory to parse.",
            ),
        )
        return func


@export
class Application(LineTerminal, ArgParseMixin):
    HeadLine = "pyGHDL.dom - Test Application"

    # load platform information (Windows, Linux, Darwin, ...)
    __PLATFORM = platform_system()

    _design: Design

    def __init__(self):
        super().__init__()

        # Initialize DOM with an empty design
        # --------------------------------------------------------------------------
        self._design = Design()

        # Call the constructor of the ArgParseMixin
        # --------------------------------------------------------------------------
        textWidth = min(max(self.Width, 80), 160)
        description = dedent(
            """\
            Application to test pyGHDL's DOM API.
            """
        )
        epilog = "\n".join(
            wrap(
                dedent(
                    """\
                    pyGHDL is a Python binding for libghdl.
                    """
                ),
                textWidth,
                replace_whitespace=False,
            )
        )

        class HelpFormatter(RawDescriptionHelpFormatter):
            def __init__(self, *args, **kwargs):
                kwargs["max_help_position"] = 30
                kwargs["width"] = textWidth
                super().__init__(*args, **kwargs)

        ArgParseMixin.__init__(
            self,
            description=description,
            epilog=epilog,
            formatter_class=HelpFormatter,
            add_help=False,
        )

        # Change error and warning reporting
        # --------------------------------------------------------------------------
        self._LOG_MESSAGE_FORMAT__[Severity.Fatal] = "{DARK_RED}[FATAL] {message}{NOCOLOR}"
        self._LOG_MESSAGE_FORMAT__[Severity.Error] = "{RED}[ERROR] {message}{NOCOLOR}"
        self._LOG_MESSAGE_FORMAT__[Severity.Warning] = "{YELLOW}[WARNING] {message}{NOCOLOR}"
        self._LOG_MESSAGE_FORMAT__[Severity.Normal] = "{GRAY}{message}{NOCOLOR}"

    # class properties
    # ============================================================================
    @property
    def Platform(self):
        return self.__PLATFORM

    def PrintHeadline(self):
        self.WriteNormal(
            dedent(
                """\
                {HEADLINE}{line}
                {headline: ^80s}
                {line}"""
            ).format(line="=" * 80, headline=self.HeadLine, **LineTerminal.Foreground)
        )

    # ============================================================================
    # Common commands
    # ============================================================================
    # common arguments valid for all commands
    # ----------------------------------------------------------------------------
    @CommonSwitchArgumentAttribute("-d", "--debug", dest="debug", help="Enable debug mode.")
    @CommonSwitchArgumentAttribute("-v", "--verbose", dest="verbose", help="Print out detailed messages.")
    @CommonSwitchArgumentAttribute("-q", "--quiet", dest="quiet", help="Reduce messages to a minimum.")
    def Run(self):
        ArgParseMixin.Run(self)

    @DefaultAttribute()
    def HandleDefault(self, _):
        self.PrintHeadline()
        self.MainParser.print_help()

        self.WriteNormal("")
        self.exit()

    # ----------------------------------------------------------------------------
    # create the sub-parser for the "help" command
    # ----------------------------------------------------------------------------
    @CommandAttribute("help", help="Display help page(s) for the given command name.")
    @ArgumentAttribute(
        metavar="Command",
        dest="Command",
        type=str,
        nargs="?",
        help="Print help page(s) for a command.",
    )
    def HandleHelp(self, args):
        self.PrintHeadline()

        if args.Command is None:
            self.MainParser.print_help()
        elif args.Command == "help":
            self.WriteError("This is a recursion ...")
        else:
            try:
                self.SubParsers[args.Command].print_help()
            except KeyError:
                self.WriteError(f"Command {args.Command} is unknown.")

        self.WriteNormal("")
        self.exit()

    # ----------------------------------------------------------------------------
    # create the sub-parser for the "version" command
    # ----------------------------------------------------------------------------
    @CommandAttribute("version", help="Display tool and version information.")
    def HandleInfo(self, args):
        self.PrintHeadline()

        copyrights = __copyright__.split("\n", 1)
        self.WriteNormal(f"Copyright:  {copyrights[0]}")
        for copyright in copyrights[1:]:
            self.WriteNormal(f"            {copyright}")
        self.WriteNormal(f"License:    {__license__}")
        authors = __author__.split(", ")
        self.WriteNormal(f"Authors:    {authors[0]}")
        for author in authors[1:]:
            self.WriteNormal(f"            {author}")
        self.WriteNormal(f"Version:    {__version__}")
        self.exit()

    # ----------------------------------------------------------------------------
    # Create the sub-parser for the "pretty" command
    # ----------------------------------------------------------------------------
    @CommandAttribute(
        "pretty",
        help="Pretty-print the DOM to console.",
        description="Translate a source file into a DOM and pretty-print the DOM.",
    )
    @SourceAttribute()
    def HandlePretty(self, args):
        self.PrintHeadline()

        if args.Files is not None:
            for file in args.Files:
                if not file.exists():
                    self.WriteError(f"File '{file!s}' does not exist.")
                    continue

                self.WriteNormal(f"Parsing file '{file!s}'")
                document = self.addFile(file, "pretty")
                self.WriteInfo(
                    dedent(
                        """\
                          libghdl processing time: {: 5.3f} us
                          DOM translation time:    {:5.3f} us
                        """
                    ).format(
                        document.LibGHDLProcessingTime * 10**6,
                        document.DOMTranslationTime * 10**6,
                    )
                )
        elif args.Directory is not None:
            d: Path = args.Directory.resolve()
            if not d.exists():
                self.WriteError(f"Directory '{d!s}' does not exist.")

            for file in d.glob("**/*.vhd*"):
                self.WriteNormal(f"Parsing file '{file!s}'")
                document = self.addFile(file, "pretty")
                self.WriteInfo(
                    dedent(
                        """\
                          libghdl processing time: {: 5.3f} us
                          DOM translation time:    {:5.3f} us
                        """
                    ).format(
                        document.LibGHDLProcessingTime * 10**6,
                        document.DOMTranslationTime * 10**6,
                    )
                )

        if not self._design.Documents:
            self.WriteFatal("No files processed at all.")

        self._design.LoadDefaultLibraries()
        self._design.Analyze()
        self.WriteInfo(
            dedent(
                """\
                  default library load time: {:5.3f} us
                  dependency analysis time:  {:5.3f} us
                """
            ).format(
                self._design._loadDefaultLibraryTime * 10**6,
                self._design._analyzeTime * 10**6,
            )
        )

        PP = PrettyPrint()

        buffer = []
        buffer.append("Design:")
        for line in PP.formatDesign(self._design, 1):
            buffer.append(line)

        print("\n".join(buffer))

        self.exit()

    def addFile(self, filename: Path, library: str) -> Document:
        lib = self._design.GetLibrary(library)

        document = Document(filename)
        self._design.AddDocument(document, lib)
        return document


# main program
def main():  # mccabe:disable=MC0001
    """This is the entry point for pyghdl.cli.dom written as a function.

    1. It extracts common flags from the script's arguments list, before :py:class:`~argparse.ArgumentParser` is fully loaded.
    2. It creates an instance of DOM test application and hands over to a class based execution.
       All is wrapped in a big ``try..except`` block to catch every unhandled exception.
    3. Shutdown the script and return its exit code.
    """
    from sys import argv as sys_argv

    debug = "-d" in sys_argv
    verbose = "-v" in sys_argv
    quiet = "-q" in sys_argv

    try:
        # handover to a class instance
        app = Application()  # debug, verbose, quiet)
        app.Run()
        app.exit()
    except PrettyPrintException as ex:
        print(f"PP: {ex!s}")
        LineTerminal.exit()

    except DOMException as ex:
        print(f"DOM: {ex!s}")
        ex2: LibGHDLException = ex.__cause__
        if ex2 is not None:
            for message in ex2.InternalErrors:
                print(f"libghdl: {message}")
            LineTerminal.exit(0)

        LineTerminal.exit(6)

    except LibGHDLException as ex:
        print(f"LIB: {ex!s}")
        for message in ex.InternalErrors:
            print(f"  {message}")
        LineTerminal.exit(5)

    except GHDLBaseException as ex:
        LineTerminal.printExceptionBase(ex)

    except NotImplementedError as ex:
        LineTerminal.printNotImplementedError(ex)

    # except ImportError as ex:
    #     printImportError(ex)
    except Exception as ex:
        LineTerminal.printException(ex)


# entry point
if __name__ == "__main__":
    LineTerminal.versionCheck((3, 6, 0))
    main()