import type { RealtimeConnectionSnapshot } from '../features/operations/realtime-client.js';

interface ShellStatusInput {
  stats?: { isRunning: boolean; dryRunMode: boolean; invitationCooldown: { reason: string } | null };
  reddit?: { ready: boolean; loggedIn?: boolean; status?: string; error?: string };
  realtime: RealtimeConnectionSnapshot;
  sync?: { syncing: boolean; syncingKind?: string | null };
}

export interface ShellStatus {
  bot: string;
  reddit: string;
  realtime: string;
  cooldown: string | null;
  sync: string;
  controlAction: 'start' | 'stop';
  controlDisabled: boolean;
}

function sentence(value: string): string { return value.charAt(0).toUpperCase() + value.slice(1); }

export function deriveShellStatus(input: ShellStatusInput): ShellStatus {
  const stats = input.stats;
  const realtime = input.realtime.status === 'connected'
    ? 'Realtime connected'
    : `Realtime ${input.realtime.status}${input.realtime.isStale ? ' (stale)' : ''}`;
  const reddit = input.reddit?.ready
    ? input.reddit.loggedIn ? `Reddit ${input.reddit.status ?? 'authenticated'}` : 'Reddit login required'
    : 'Reddit session unavailable';
  return {
    bot: stats ? `${stats.isRunning ? 'Running' : 'Stopped'}${stats.dryRunMode ? ' (dry run)' : ''}` : 'Bot state unavailable',
    reddit,
    realtime,
    cooldown: stats?.invitationCooldown?.reason ?? null,
    sync: input.sync?.syncing ? `${sentence(input.sync.syncingKind ?? 'unknown')} sync active` : 'No active sync',
    controlAction: stats?.isRunning ? 'stop' : 'start',
    controlDisabled: stats === undefined,
  };
}