import { useChatSessions } from '@/state/useChatSessions';

export type SlashCommandResult = { handled: true; feedback: string } | { handled: false };

type UseSlashCommandsParams = {
  sessionId: string | null;
};

export const useSlashCommands = ({ sessionId }: UseSlashCommandsParams) => {
  const { renameSession } = useChatSessions();

  const execute = async (input: string): Promise<SlashCommandResult> => {
    const trimmed = input.trim();
    if (!trimmed.startsWith('/')) return { handled: false };

    const spaceIndex = trimmed.indexOf(' ');
    const command = spaceIndex === -1 ? trimmed.slice(1) : trimmed.slice(1, spaceIndex);
    const args = spaceIndex === -1 ? '' : trimmed.slice(spaceIndex + 1).trim();

    switch (command) {
      case 'rename':
        if (!sessionId || !args) return { handled: false };
        await renameSession(sessionId, args);
        return { handled: true, feedback: `Session renamed to "${args}"` };
      default:
        return { handled: false };
    }
  };

  return { execute };
};