#!/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.


info = '''
minitj [options...] [python expression] [file/URI...]

This is the MINImal version of the Transform Json tool: just use a Python
expression using any of the variables `v`, `value`, `d`, or `data` to act
on the decoded JSON input. The result is emitted as JSON output.
'''


from json import dump, load
from sys import argv, exit, stderr, stdin, stdout
from typing import Iterable


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


class Skip:
    pass


skip = Skip()


def rescue(attempt, fallback = None):
    try:
        return attempt()
    except Exception as e:
        if callable(fallback):
            return fallback(e)
        return fallback

catch = rescue
catched = rescue
caught = rescue
recover = rescue
recovered = rescue
rescued = rescue


def result_needs_fixing(x):
    if x is None or isinstance(x, (bool, int, float, str)):
        return False
    rec = result_needs_fixing
    if isinstance(x, dict):
        return any(rec(k) or rec(v) for k, v in x.items())
    if isinstance(x, (list, tuple)):
        return any(rec(e) for e in x)
    return True


def fix_result(x, default):
    if x is type:
        return type(default).__name__

    # if expression results in a func, auto-call it with the original data
    if callable(x):
        x = x(default)

    if x is None or isinstance(x, (bool, int, float, str)):
        return x

    rec = fix_result

    if isinstance(x, dict):
        return {
            rec(k, default): rec(v, default) for k, v in x.items() if not
                (isinstance(k, Skip) or isinstance(v, Skip))
        }
    if isinstance(x, Iterable):
        return tuple(rec(e, default) for e in x if not isinstance(e, Skip))

    if isinstance(x, Exception):
        raise x

    return None if isinstance(x, Skip) else str(x)


def seems_url(path):
    protocols = ('https://', 'http://', 'file://', 'ftp://', 'data:')
    return any(path.startswith(p) for p in protocols)


cr = '\r'
crlf = '\r\n'
dquo = '"'
dquote = '"'
empty = ''
lcurly = '{'
lf = '\n'
rcurly = '}'
s = ''
squo = '\''
squote = '\''
utf8bom = '\xef\xbb\xbf'

nil = None
none = None
null = None


no_input_opts = (
    '=', '-n', '--n', '-nil', '--nil', '-none', '--none', '-null', '--null',
)
compact_output_opts = (
    '-c', '--c', '-compact', '--compact', '-j0', '--j0', '-json0', '--json0',
)
more_modules_opts = ('-mm', '--mm', '-more', '--more')

args = argv[1:]
no_input = False
compact_output = False

while len(args) > 0:
    if args[0] in no_input_opts:
        no_input = True
        args = args[1:]
        continue

    if args[0] in compact_output_opts:
        compact_output = True
        args = args[1:]
        continue

    if args[0] in more_modules_opts:
        import functools
        import itertools
        import math
        import random
        import statistics
        import string
        import time
        args = args[1:]
        continue

    break


try:
    expr = 'data'
    if len(args) > 0:
        expr = args[0]
        args = args[1:]

    if expr == '.':
        expr = 'data'

    if len(args) > 1:
        raise Exception('can\'t use more than 1 input')
    path = '-' if len(args) == 0 else args[0]

    if no_input:
        data = None
    elif path == '-':
        data = load(stdin)
    elif seems_url(path):
        from io import TextIOWrapper
        from urllib.request import urlopen
        with urlopen(path) as inp:
            with TextIOWrapper(inp, encoding='utf-8') as txt:
                data = load(txt)
    else:
        with open(path, encoding='utf-8') as inp:
            data = load(inp)

    exec = None
    open = None
    v = val = value = d = dat = data
    v = eval(expr)
    if result_needs_fixing(v):
        v = fix_result(v, data)

    if compact_output:
        dump(v, stdout, indent=None, separators=(',', ':'), allow_nan=False)
    else:
        dump(v, stdout, indent=2, separators=(',', ': '), allow_nan=False)
    print()
except BrokenPipeError:
    # quit quietly, instead of showing a confusing error message
    stderr.close()
    exit(0)
except KeyboardInterrupt:
    exit(2)
except Exception as e:
    print(f'\x1b[31m{str(e)}\x1b[0m', file=stderr)
    exit(1)