#!/usr/bin/env python3
"""Verify and record dependencies of this project's installed Linux binaries."""
import argparse
import hashlib
import json
from pathlib import Path
import re
import subprocess
import sys

ROOT = Path(__file__).resolve().parents[1]
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('--prefix', type=Path, default=ROOT / 'build/install')
parser.add_argument('--output', type=Path, default=ROOT / 'tests/results/installed-dependencies.json')
args = parser.parse_args()
if not sys.platform.startswith('linux'):
    raise SystemExit('This records Linux development-host dependencies only.')
report = {'scope': 'Linux development host; installed binaries use system dependencies; not a clean-OS distribution test',
          'executables': {}}
for name in ['docview', 'docview-pdf-worker', 'docview-archive-worker']:
    path = (args.prefix / 'bin' / name).resolve(strict=True)
    dependencies = subprocess.check_output(['ldd', str(path)], text=True)
    if 'not found' in dependencies:
        raise SystemExit(f'{name}: unresolved runtime dependency')
    dynamic = subprocess.check_output(['readelf', '-d', str(path)], text=True)
    needed = sorted(re.findall(r'\(NEEDED\).*?\[(.*?)\]', dynamic))
    if name == 'docview' and any('pdfium' in value or 'qpdf' in value for value in needed):
        raise SystemExit('Main must not link either independent PDF parser.')
    if name == 'docview-pdf-worker' and not any('libqpdf' in value for value in needed):
        raise SystemExit('PDFWorker libqpdf dependency missing.')
    resolved = sorted({line.strip().split()[0] for line in dependencies.splitlines()
                       if line.strip() and not line.strip().startswith('linux-vdso')})
    report['executables'][name] = {'sha256': hashlib.file_digest(path.open('rb'), 'sha256').hexdigest(),
                                   'resolvedLibraries': resolved, 'directDependencies': needed, 'missing': []}
report['mainLinksPdfiumDirectly'] = False
report['mainLinksQpdfDirectly'] = False
report['qpdfVersion'] = subprocess.check_output(['pkg-config', '--modversion', 'libqpdf'], text=True).strip()
license_path = args.prefix / 'share/doc/docview/licenses/qpdf/LICENSE.txt'
report['installedQpdfLicenseSha256'] = hashlib.sha256(license_path.read_bytes()).hexdigest()
args.output.write_text(json.dumps(report, indent=2) + '\n')
print('Installed dependencies resolved; Main has no direct PDF parser linkage.')