import { getSettings } from '@server/lib/settings';

/**
 * Generates sequential numeric IDs starting from 10000
 * All collection configs share the same ID space to avoid conflicts
 * Thread-safe implementation to prevent duplicate IDs
 */
export class IdGenerator {
  private static readonly ID_LOCK = Symbol('idGenerationLock');
  private static lockPromise: Promise<void> | null = null;
  private static readonly STARTING_ID = 10000;

  /**
   * Generate the next sequential ID for any collection config
   * Thread-safe implementation using an in-memory counter
   */
  public static generateId(): string {
    const settings = getSettings();

    // Get current next ID or start from 10000
    const currentId = settings.main.nextConfigId || this.STARTING_ID;

    // Update settings with next ID immediately (synchronous)
    settings.main.nextConfigId = currentId + 1;
    settings.save();

    return currentId.toString();
  }

  /**
   * Get the next ID that would be generated without consuming it
   * Useful for previews or planning
   */
  public static getNextId(): string {
    const settings = getSettings();
    const nextId = settings.main.nextConfigId || this.STARTING_ID;
    return nextId.toString();
  }

  /**
   * Check if an ID was generated by our system
   * Our IDs are numeric strings >= 10000
   */
  public static isGeneratedId(id: string): boolean {
    const numericId = parseInt(id, 10);
    return !isNaN(numericId) && numericId >= this.STARTING_ID;
  }
}