#!/usr/bin/env python3
"""MIT. Independent byte-identity checks; Python standard library only.
Download cases-v1.json and results-v1.json beside this script, then run it.
"""
import json
from pathlib import Path

root = Path(__file__).resolve().parent
cases = json.loads((root / 'cases-v1.json').read_text())['cases']
results = {r['id']: r for r in json.loads((root / 'results-v1.json').read_text())['results']}

def codepoints(s):
    return [f'U+{ord(c):04X}' for c in s]

def hexbytes(b):
    return ' '.join(f'{v:02X}' for v in b)

changed = []
for case in cases:
    raw = bytes(case['bytes'])
    if case['kind'] == 'text':
        assert case['text'].encode('utf-8') == raw, case['id']
    try:
        raw.decode('utf-8', errors='strict')
        valid = True
        # TextDecoder's default BOM treatment removes one initial UTF-8 BOM.
        decoded = raw.decode('utf-8-sig', errors='strict')
    except UnicodeDecodeError:
        valid = False
        # Site-specific whole-input fallback, not Windows-1252.
        decoded = raw.decode('latin-1')
    row = results[case['id']]
    encoded = decoded.encode('utf-8')
    assert row['strictUtf8'] == valid, case['id']
    assert row['inputHex'] == hexbytes(raw), case['id']
    assert row['decodedText'] == decoded, case['id']
    assert row['decodedCodePoints'] == codepoints(decoded), case['id']
    assert row['reencodedHex'] == hexbytes(encoded), case['id']
    assert row['byteIdentityPreserved'] == (raw == encoded), case['id']
    assert ('latin1-fallback' in row['notices']) == (not valid), case['id']
    if case['kind'] == 'text':
        assert row['sevenBitAccepted'] == case['text'].isascii(), case['id']
    if raw != encoded:
        changed.append(case['id'])
assert len(results) == len(cases) == 36
print(json.dumps({'passed': len(cases), 'changed_byte_identity': len(changed), 'changed_cases': changed}))

# SPDX-License-Identifier: MIT
# Copyright (c) 2026 Binary Translator
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# 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.
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.