import json
import time
from datetime import datetime, timezone
import config_utils
import factory


def _fmt_ts(ts):
    try:
        dt = datetime.fromtimestamp(int(ts), tz=timezone.utc)
        return dt.strftime('%Y-%m-%d %H:%M UTC')
    except Exception:
        return '-'


def _active_sessions_table():
    rows = config_utils.get_active_sessions()
    no_data = '<p class="text-muted" style="margin:0">No active sessions.</p>'
    if not rows:
        return no_data
    now = int(time.time())
    trs = ''
    for email, access_level, logged_in_at, last_seen in rows:
        ago = config_utils.relative_time(int(last_seen), now)
        trs += (
            f'<tr>'
            f'<td class="table-cell">{factory.e(email)}</td>'
            f'<td class="table-cell">{factory.e(access_level)}</td>'
            f'<td class="table-cell">{_fmt_ts(logged_in_at)}</td>'
            f'<td class="table-cell">{factory.e(ago)} ago</td>'
            f'</tr>'
        )
    return (
        '<table class="data-table"><thead><tr>'
        '<th class="table-header">Email</th>'
        '<th class="table-header">Access Level</th>'
        '<th class="table-header">Logged In</th>'
        '<th class="table-header">Last Seen</th>'
        '</tr></thead><tbody>' + trs + '</tbody></table>'
    )


def collect_tokens(cfg):
    tokens = config_utils.collect_layout_tokens(cfg)
    tokens['ACCOUNT_LEVEL_OPTIONS'] = json.dumps([
        {'value': 'viewer',        'label': 'Viewer (read-only access to live data)'},
        {'value': 'administrator', 'label': 'Administrator (can modify configuration)'},
        {'value': 'manager',       'label': 'Manager (full access including account management)'},
    ])
    tokens['ACTIVE_SESSIONS_TABLE'] = _active_sessions_table()
    content = factory.load_json(f'{factory.PAGES_DIR}/accountmanage/content.json')
    for table_item in factory.iter_table_items(content.get('items', [])):
        ds = table_item.get('datasource', '')
        tokens[factory.table_token_key(ds)] = factory.build_table(table_item, tokens, config_utils.load_datasource(ds))
    return tokens