#!/usr/bin/python3

# The MIT License (MIT)
#
# Copyright © 2024 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 math import modf
from sys import argv, exit, stderr, stdin, stdout


info = '''
nj [filepath/URI...]


Nice Json indents and styles JSON data. When not given a filepath to read
data from, this tool reads from standard input.
'''

if len(argv) == 2 and argv[1] in ('-h', '--h', '-help', '--help'):
    print(info.strip(), file=stderr)
    exit(0)


# level2indent speeds up func indent
level2indent = tuple(i * '  ' for i in range(64))


def indent(w, level: int) -> None:
    'Emit 2 spaces for each indentation level.'

    if level < 1:
        return

    if level < len(level2indent):
        w.write(level2indent[level])
        return

    while level >= len(level2indent):
        w.write(level2indent[-1])
        level -= len(level2indent)
    w.write(level2indent[level])


def restyle(w, data, pre: int = 0, level: int = 0) -> None:
    'This func is where all the recursive output-action starts/happens.'

    f = type2func[type(data)]
    if f != None:
        f(w, data, pre, level)
        # don't forget to end the final line, if at `top-level`
        if level == 0:
            w.write('\n')
    else:
        raise ValueError(f'unsupported type {type(data)}')


def restyle_bool(w, data: bool, pre: int, level: int) -> None:
    indent(w, pre)
    if data:
        w.write('\x1b[38;5;74mtrue\x1b[0m')
    else:
        w.write('\x1b[38;5;74mfalse\x1b[0m')


def restyle_dict(w, data: dict, pre: int, level: int) -> None:
    if len(data) == 0:
        indent(w, pre)
        w.write('\x1b[38;5;248m{}\x1b[0m')
        return

    indent(w, pre)
    w.write('\x1b[38;5;248m{\x1b[0m\n')
    for (i, k) in enumerate(data):
        if i > 0:
            w.write('\x1b[38;5;248m,\x1b[0m\n')
        restyle_key(w, k, level + 1)
        restyle(w, data[k], 0, level + 1)
    w.write('\n')
    indent(w, level)
    w.write('\x1b[38;5;248m}\x1b[0m')


def restyle_float(w, data: float, pre: int, level: int) -> None:
    indent(w, pre)
    # can't figure out a direct float-format option which both avoids the
    # chance of scientific notation (invalid as JSON), and the chance of
    # unneeded trailing decimal 0s; neither {data:-1} nor {data:-1f} work
    if modf(data)[0] == 0.0:
        w.write(f'\x1b[38;5;29m{data}\x1b[0m')
    else:
        s = f'{data:-1f}'.rstrip('0')
        w.write(f'\x1b[38;5;29m{s}\x1b[0m')


def restyle_int(w, data: int, pre: int, level: int) -> None:
    indent(w, pre)
    w.write(f'\x1b[38;5;29m{data}\x1b[0m')


def restyle_key(w, k: str, level: int) -> None:
    indent(w, level)
    f = dumps
    w.write(f'\x1b[38;5;248m"\x1b[38;5;99m{f(k)[1:-1]}\x1b[38;5;248m": \x1b[0m')


def restyle_list(w, data: list, pre: int, level: int) -> None:
    if len(data) == 0:
        indent(w, pre)
        w.write('\x1b[38;5;248m[]\x1b[0m')
        return

    indent(w, pre)
    w.write('\x1b[38;5;248m[\x1b[0m\n')
    for (i, e) in enumerate(data):
        if i > 0:
            w.write('\x1b[38;5;248m,\x1b[0m\n')
        restyle(w, e, level + 1, level + 1)
    w.write('\n')
    indent(w, level)
    w.write('\x1b[38;5;248m]\x1b[0m')


def restyle_none(w, data: bool, pre: int, level: int) -> None:
    indent(w, pre)
    w.write('\x1b[38;5;248mnull\x1b[0m')


def restyle_str(w, data: str, pre: int, level: int) -> None:
    indent(w, pre)
    # f'\x1b[38;5;248m"\x1b[38;5;24m{dumps(data)[1:-1]}\x1b[38;5;248m"\x1b[0m'
    w.write(f'\x1b[38;5;248m"\x1b[0m{dumps(data)[1:-1]}\x1b[38;5;248m"\x1b[0m')


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


# type2func 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
type2func = {
    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,
}


try:
    if len(argv) < 2:
        restyle(stdout, load(stdin))
    elif len(argv) == 2:
        name = argv[1]
        if name == '-':
            restyle(stdout, load(stdin))
        elif seems_url(name):
            from urllib.request import urlopen
            with urlopen(name) as inp:
                restyle(stdout, load(inp))
        else:
            with open(name, encoding='utf-8') as inp:
                restyle(stdout, load(inp))
    else:
        raise ValueError('multiple inputs not allowed')
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)