# -*- coding: utf-8 -*-
#
# The MIT License (MIT)
#
# Copyright (c) 2018 Philippe Faist
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#

import argparse
import fileinput
import json
import logging
import sys

from ..latexwalker import LatexWalker, disp_node, make_json_encoder
from ..version import version_str


def main(argv=None):

    if argv is None:
        argv = sys.argv[1:]

    parser = argparse.ArgumentParser(prog="latexwalker", add_help=False)

    parser.add_argument(
        "--output-format",
        metavar="FORMAT",
        dest="output_format",
        choices=["human", "json"],
        default="human",
        help='Requested output format for the node tree ("human" or "json")',
    )
    parser.add_argument(
        "--json-indent",
        metavar="NUMSPACES",
        dest="json_indent",
        type=int,
        default=2,
        help="Indentation in JSON output (specify number of spaces "
        "per indentation level)",
    )
    parser.add_argument(
        "--json-compact",
        dest="json_indent",
        action="store_const",
        const=None,
        help="Output compact JSON",
    )

    parser.add_argument(
        "--keep-inline-math",
        action="store_const",
        const=True,
        dest="keep_inline_math",
        default=True,
        help=argparse.SUPPRESS,
    )
    parser.add_argument(
        "--no-keep-inline-math",
        action="store_const",
        const=False,
        dest="keep_inline_math",
        help=argparse.SUPPRESS,
    )

    parser.add_argument(
        "--tolerant-parsing",
        action="store_const",
        const=True,
        dest="tolerant_parsing",
        default=True,
    )
    parser.add_argument(
        "--no-tolerant-parsing",
        action="store_const",
        const=False,
        dest="tolerant_parsing",
        help="Tolerate syntax errors when parsing, and attempt "
        "to continue (default yes)",
    )

    # I'm not sure this flag is useful and if it should be exposed at all.
    # Accept it, but make it hidden.
    parser.add_argument(
        "--strict-braces",
        action="store_const",
        const=True,
        dest="strict_braces",
        default=False,
        help=argparse.SUPPRESS,
    )
    parser.add_argument(
        "--no-strict-braces",
        action="store_const",
        const=False,
        dest="strict_braces",
        # help="Report errors for mismatching LaTeX braces (default no)"
        help=argparse.SUPPRESS,
    )

    parser.add_argument(
        "-q",
        "--quiet",
        dest="logging_level",
        action="store_const",
        const=logging.ERROR,
        default=logging.INFO,
        help="Suppress warning messages",
    )
    parser.add_argument(
        "-v",
        "--verbose",
        dest="logging_level",
        action="store_const",
        const=logging.DEBUG,
        help="Verbose output",
    )
    parser.add_argument(
        "--version",
        action="version",
        version="pylatexenc {}".format(version_str),
        help="Show version information and exit",
    )
    parser.add_argument(
        "--help", action="help", help="Show this help information and exit"
    )

    parser.add_argument(
        "--code",
        "-c",
        action="store",
        default=None,
        metavar="LATEX_CODE",
        help="Convert the given LATEX_CODE to unicode text instead of reading "
        "from FILE or standard input.  You cannot specify FILEs if you use this "
        "option, and any standard input is ignored.",
    )

    parser.add_argument(
        "files",
        metavar="FILE",
        nargs="*",
        help="Input files (if none specified, read from stdandard input)",
    )

    args = parser.parse_args(argv)

    logging.basicConfig()
    logging.getLogger().setLevel(args.logging_level)
    logger = logging.getLogger(__name__)

    latex = ""
    if args.code:
        if args.files:
            logger.error(
                "Cannot specify both FILEs and --code option. "
                "Use --help option for more information."
            )
            sys.exit(1)
        latex = args.code
    else:
        for line in fileinput.input(files=args.files):
            latex += line

    latexwalker = LatexWalker(
        latex, tolerant_parsing=args.tolerant_parsing, strict_braces=args.strict_braces
    )

    (nodelist, pos, len_) = latexwalker.get_latex_nodes()

    if args.output_format == "human":
        print("\n--- NODES ---\n")
        for n in nodelist:
            disp_node(n)
        print("\n-------------\n")
        return

    if args.output_format == "json":
        json.dump(
            {
                "nodelist": nodelist,
            },
            sys.stdout,
            cls=make_json_encoder(latexwalker),
            indent=args.json_indent,
        )
        sys.stdout.write("\n")
        return

    raise ValueError("Invalid output format: " + args.output_format)


def run_main():

    try:

        main()

    except SystemExit:
        raise
    except:  # lgtm [py/catch-base-exception]
        import pdb
        import traceback

        traceback.print_exc()
        pdb.post_mortem()


if __name__ == "__main__":

    # run_main() # debug
    main()
