"""Run in CT100191 after staging decoder-channel-playback.js in /tmp. No restart needed."""
import datetime
import json
import pathlib
import shutil

web = pathlib.Path('/usr/share/jellyfin/web')
backup = pathlib.Path('/var/lib/jellyfin/decoder-plugin-backups') / ('web-playback-' + datetime.datetime.now(datetime.timezone.utc).strftime('%Y%m%dT%H%M%SZ'))
backup.mkdir(mode=0o700)
for name in ['index.html', 'config.json']:
    shutil.copy2(web / name, backup / name)
script = web / 'decoder-channel-playback.js'
if script.exists():
    shutil.copy2(script, backup / script.name)
shutil.copy2('/tmp/decoder-channel-playback.js', script)
html = (web / 'index.html').read_text()
tag = '<script defer="defer" src="decoder-channel-playback.js"></script>'
if tag not in html:
    html = html.replace('<head>', '<head>' + tag, 1)
    assert tag in html
    (web / 'index.html').write_text(html)
config = json.loads((web / 'config.json').read_text())
plugins = config.setdefault('plugins', [])
if 'DecoderChannelPlayback' not in plugins:
    plugins.append('DecoderChannelPlayback')
(web / 'config.json').write_text(json.dumps(config, indent=2) + '\n')
print(json.dumps({'web_playback_installed': True, 'backup': str(backup)}))