import os
from view_common import CONFIGS_DIR

RADIUS_LOG_MAX  = 50
RADIUS_LOG_FILE = '/var/log/freeradius/radius.log'


def _radius_log_tail(cfg):
    try:
        log_max_kb = cfg.get('radius', {}).get('general', {}).get('log_max_kb', 1024)
        size_kb = os.path.getsize(RADIUS_LOG_FILE) / 1024
        with open(RADIUS_LOG_FILE) as f:
            lines = f.readlines()
        if not lines:
            return '(log is empty)', ''
        total = len(lines)
        tail = lines[-RADIUS_LOG_MAX:]
        shown = len(tail)
        hidden = total - shown
        pct = min(100, round(size_kb / log_max_kb * 100)) if log_max_kb else 0
        left = f'Showing {shown} of {total} lines ({hidden} not shown)' if hidden > 0 else f'Showing {shown} of {total} lines'
        right = f'Log file size: {size_kb:.1f} KB ({pct}% of max)'
        summary = (
            '<div id="radius-log-summary" class="text-muted" style="display:flex;justify-content:space-between;margin-top:0.5em;">'
            f'<span>{left}</span><span>{right}</span></div>'
        )
        return ''.join(tail).strip(), summary
    except FileNotFoundError:
        return '(log file not found)', ''
    except Exception:
        return '(error reading log)', ''


def collect_tokens(cfg):
    tokens = {}
    try:
        tokens['RADIUS_SECRET'] = open(f'{CONFIGS_DIR}/.radius-secret').read().strip()
    except OSError:
        tokens['RADIUS_SECRET'] = '(Generation is pending - visit Actions to apply generation command)'
    fr      = cfg.get('radius', {})
    fr_opts = fr.get('options', {})
    fr_gen  = fr.get('general', {})
    tokens['RADIUS_MAC_FORMAT']     = fr_opts.get('mac_format', 'aabbccddeeff')
    tokens['RADIUS_APPLY_TO']       = fr_opts.get('apply_to', 'all')
    tokens['RADIUS_LOGGING']        = 'true' if fr_gen.get('logging', False) else ''
    tokens['RADIUS_GEN_LOG_MAX_KB'] = str(fr_gen.get('log_max_kb', 1024))
    tokens['RADIUS_LOG_TAIL'], tokens['RADIUS_LOG_SUMMARY'] = _radius_log_tail(cfg)
    return tokens