#!/usr/bin/env python3
"""Compare complete independently restored builds; retain mismatches as evidence."""
import argparse
import json
from pathlib import Path
import sys

from release_artifacts import compare

parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('first', type=Path)
parser.add_argument('second', type=Path)
parser.add_argument('--report', required=True, type=Path)
args = parser.parse_args()
try:
    if args.first.resolve() == args.second.resolve():
        raise ValueError('Specify two independently restored build trees')
    if args.report.exists() or args.report.is_symlink():
        raise ValueError('Report output already exists')
    report = compare(args.first, args.second)
    with args.report.open('x') as stream:
        stream.write(json.dumps(report, indent=2) + '\n')
    for item in report['artifacts']:
        print(('PASS' if item['identical'] else 'MISMATCH') + ': ' + item['name'])
    if report['status'] != 'passed':
        raise ValueError(f'Builds differ; inspect {args.report}')
    print(f'PASS: all {len(report["artifacts"])} artifacts are byte-identical: {args.report}')
    print('NOTE: this comparison establishes matching bytes; retain each isolated build log as execution evidence')
except (OSError, ValueError, KeyError) as error:
    sys.exit(f'ERROR: {error}')