#!/usr/bin/python3

# The MIT License (MIT)
#
# Copyright © 2020-2025 pacman64
#
# 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.


from json import dumps, load
from re import compile as compile_re
from sys import argv, exit, stderr, stdin, stdout
from typing import List, Union


info = '''
ngron [options...] [filepath/URI...]


Nice GRON converts JSON data into `grep`-friendly lines, similar to what
tool `gron` (GRep jsON; https://github.com/tomnomnom/gron) does.

This tool uses `nicer` ANSI styles than the original, hence its name, but
can't convert its output back into JSON, unlike the latter.

Unlike the original `gron`, there's no sort-mode. When not given a named
source (filepath/URI) to read from, data are read from standard input.

Options, where leading double-dashes are also allowed:

    -h         show this help message
    -help      show this help message

    -m         monochrome (default), enables unstyled output-mode
    -c         color, enables ANSI-styled output-mode
    -color     enables ANSI-styled output-mode
'''

# handle standard help cmd-line options, quitting right away in that case
if len(argv) == 2 and argv[1] in ('-h', '--h', '-help', '--help'):
    print(info.strip())
    exit(0)


# simple_str_re helps funcs restyle_path and emit_path figure out which
# strings need quoting
simple_str_re = compile_re('[a-zA-Z_][a-zA-Z_0-9]*')


def gron_path(w, path: List[Union[int, str]]) -> None:
    w.write('json')
    for e in path:
        if isinstance(e, int):
            w.write(f'[{e}]')
            continue
        if simple_str_re.match(e):
            w.write(f'.{e}')
            continue
        w.write(f'[{dumps(e)}]')
    w.write(' = ')


def restyle_path(w, path: List[Union[int, str]]) -> None:
    w.write('\x1b[38;2;135;95;255mjson')
    syntax = False

    for e in path:
        if isinstance(e, int):
            w.write('\x1b[38;2;168;168;168m[\x1b[38;2;0;135;95m')
            w.write(str(e))
            w.write('\x1b[38;2;168;168;168m]')
            syntax = True
            continue

        if simple_str_re.match(e):
            w.write(f'\x1b[38;2;168;168;168m.\x1b[38;2;135;95;255m{e}')
            syntax = False
            continue

        w.write('\x1b[38;2;168;168;168m["\x1b[38;2;0;95;135m')
        w.write(dumps(e)[1:-1])
        w.write('\x1b[38;2;168;168;168m"]')
        syntax = True

    if syntax:
        w.write(' = ')
    else:
        w.write('\x1b[38;2;168;168;168m = ')


def end_styled_line(w) -> None:
    w.write('\x1b[38;2;168;168;168m;\x1b[0m\n')


def colored_gron(w, data, path: List[Union[int, str]]) -> None:
    'This func is where all the recursive output-action starts/happens.'

    f = type2ansi[type(data)]
    if f != None:
        f(w, data, path)
    else:
        raise ValueError(f'unsupported type {type(data)}')


def restyle_bool(w, data: bool, path: List[Union[int, str]]) -> None:
    'Handle booleans for func restyle.'

    restyle_path(w, path)
    if data:
        w.write('\x1b[38;2;95;175;215mtrue')
    else:
        w.write('\x1b[38;2;95;175;215mfalse')
    end_styled_line(w)


def restyle_dict(w, data: dict, path: List[Union[int, str]]) -> None:
    'Handle dictionaries for func restyle.'

    restyle_path(w, path)
    w.write('\x1b[38;2;168;168;168m{};\x1b[0m\n')

    path.append('')
    for k, v in data.items():
        path[-1] = k
        colored_gron(w, v, path)
    del path[-1]


def restyle_float(w, data: float, path: List[Union[int, str]]) -> None:
    'Handle floats for func restyle, emitting as many decimals as needed.'

    restyle_path(w, path)
    # n = int(data)
    # if float(n) != data:
    #     w.write(f'\x1b[38;2;0;135;95m{data:-1}\x1b[0m')
    # else:
    #     w.write(f'\x1b[38;2;0;135;95m{n}\x1b[0m')
    w.write(f'\x1b[38;2;0;135;95m{data:-1}\x1b[0m')
    end_styled_line(w)


def restyle_int(w, data: int, path: List[Union[int, str]]) -> None:
    'Handle integers for func restyle.'

    restyle_path(w, path)
    w.write(f'\x1b[38;2;0;135;95m{data}\x1b[0m')
    end_styled_line(w)


def restyle_list(w, data: list, path: List[Union[int, str]]) -> None:
    'Handle lists for func restyle.'

    restyle_path(w, path)
    w.write('\x1b[38;2;168;168;168m[];\x1b[0m\n')

    path.append(0)
    for i, v in enumerate(data):
        path[-1] = i
        colored_gron(w, v, path)
    del path[-1]


def restyle_none(w, data: bool, path: List[Union[int, str]]) -> None:
    'Handle nulls for func restyle.'

    restyle_path(w, path)
    w.write('\x1b[38;2;168;168;168mnull')
    end_styled_line(w)


def restyle_str(w, data: str, path: List[Union[int, str]]) -> None:
    'Handle strings for func restyle.'

    restyle_path(w, path)
    w.write(f'\x1b[38;2;168;168;168m"\x1b[0m')
    w.write(dumps(data)[1:-1])
    w.write(f'\x1b[38;2;168;168;168m"\x1b[0m')
    end_styled_line(w)


def gron(w, data, path: List[Union[int, str]]) -> None:
    'Recursively output data into gron-format lines.'

    f = type2gron[type(data)]
    if f != None:
        f(w, data, path)
    else:
        raise ValueError(f'unsupported type {type(data)}')


def gron_bool(w, data: bool, path: List[Union[int, str]]) -> None:
    'Handle booleans for func gron.'

    gron_path(w, path)
    if data:
        w.write('true;\n')
    else:
        w.write('false;\n')


def gron_dict(w, data: dict, path: List[Union[int, str]]) -> None:
    'Handle dictionaries for func gron.'

    gron_path(w, path)
    w.write('{};\n')

    path.append('')
    for k, v in data.items():
        path[-1] = k
        gron(w, v, path)
    del path[-1]

def gron_float(w, data: float, path: List[Union[int, str]]) -> None:
    'Handle floats for func gron, emitting as many decimals as needed.'

    gron_path(w, path)
    # n = int(data)
    # if float(n) != data:
    #     w.write(f'{data:-1};\n')
    # else:
    #     w.write(f'{n};\n')
    w.write(f'{data:-1};\n')


def gron_int(w, data: int, path: List[Union[int, str]]) -> None:
    'Handle integers for func gron.'

    gron_path(w, path)
    w.write(f'{data};\n')


def gron_list(w, data: list, path: List[Union[int, str]]) -> None:
    'Handle lists for func gron.'

    gron_path(w, path)
    w.write('[];\n')

    path.append(0)
    for i, v in enumerate(data):
        path[-1] = i
        gron(w, v, path)
    del path[-1]


def gron_none(w, data: bool, path: List[Union[int, str]]) -> None:
    'Handle nulls for func gron.'

    gron_path(w, path)
    w.write('null;\n')


def gron_str(w, data: str, path: List[Union[int, str]]) -> None:
    'Handle strings for func gron.'

    gron_path(w, path)
    w.write(f'{dumps(data)};\n')


def seems_url(s: str) -> bool:
    protocols = ('https://', 'http://', 'file://', 'ftp://', 'data:')
    return any(s.startswith(p) for p in protocols)


# type2ansi helps func restyle dispatch styler funcs, using values' types
# as the keys; while JSON doesn't have int values, the stdlib auto-promotes
# round JSON numbers into ints, and so this table has a func for those too
type2ansi = {
    type(None): restyle_none,
    bool: restyle_bool,
    int: restyle_int,
    float: restyle_float,
    str: restyle_str,
    list: restyle_list,
    tuple: restyle_list,
    dict: restyle_dict,
}


# type2gron helps func emit_gron dispatch emitter funcs, using values' types
# as the keys; while JSON doesn't have int values, the stdlib auto-promotes
# round JSON numbers into ints, and so this table has a func for those too
type2gron = {
    type(None): gron_none,
    bool: gron_bool,
    int: gron_int,
    float: gron_float,
    str: gron_str,
    list: gron_list,
    tuple: gron_list,
    dict: gron_dict,
}


if len(argv) > 1 and argv[1].startswith('-'):
    l = argv[1].lstrip('-').lower()
    if l in ('c', 'color', 'nice'):
        emit = colored_gron
        args = argv[2:]
    elif l in ('g', 'gron', 'm', 'monochrome', 'p', 'plain'):
        emit = gron
        args = argv[2:]
    else:
        emit = gron
        args = argv[1:]
else:
    args = argv[1:]
    emit = gron

try:
    if len(args) > 1:
        raise ValueError('multiple inputs not allowed')

    name = args[0] if len(args) > 0 else '-'

    if name == '-':
        emit(stdout, load(stdin), [])
    elif seems_url(name):
        from urllib.request import urlopen
        with urlopen(name) as inp:
            emit(stdout, load(inp), [])
    else:
        with open(name, encoding='utf-8') as inp:
            emit(stdout, load(inp), [])
except BrokenPipeError:
    # quit quietly, instead of showing a confusing error message
    stderr.close()
except KeyboardInterrupt:
    exit(2)
except Exception as e:
    print(f'\x1b[31m{e}\x1b[0m', file=stderr)
    exit(1)