#!/usr/bin/env python3
"""Merge this project's HTTP registry into a selected daemon JSON file."""
import json
from pathlib import Path
import shutil
import sys

if len(sys.argv) != 2:
    sys.exit('Usage: python3 ci/runner/configure-docker.py <daemon.json>')
path = Path(sys.argv[1]).expanduser()
data = json.loads(path.read_text()) if path.exists() else {}
registries = data.setdefault('insecure-registries', [])
if not isinstance(registries, list):
    sys.exit('Existing insecure-registries must be an array; configuration left unchanged')
if '192.168.2.28:3000' in registries:
    print('Internal registry already configured; no change')
    sys.exit(0)
registries.append('192.168.2.28:3000')
path.parent.mkdir(parents=True, exist_ok=True)
if path.exists():
    backup = path.with_name(path.name + '.before-agiledancers')
    if not backup.exists():
        shutil.copy2(path, backup)
# Write in the same directory, then replace atomically.
temporary = path.with_name(path.name + '.agiledancers.tmp')
with temporary.open('x') as output:
    json.dump(data, output, indent=2)
    output.write('\n')
if path.exists():
    shutil.copymode(path, temporary)
temporary.replace(path)
print('Internal registry added; restart/apply Docker Engine configuration to activate')