/**
 * Constants for telegram-bot-workers
 *
 * Centralized magic strings and configuration values for better maintainability.
 *
 * Usage:
 *   import { SESSION_KEYS, MESSAGE_MARKERS, sessionKey } from './constants';
 *   const key = sessionKey(SESSION_KEYS.DELETE_CONFIRM, userId);
 */

/**
 * Session key prefixes for KV storage
 */
export const SESSION_KEYS = {
  DELETE_CONFIRM: 'delete_confirm',
  SERVER_ORDER_CONFIRM: 'server_order_confirm',
  SERVER_SESSION: 'server_session',
  RATE_LIMIT: 'rate_limit',
  NOTIFICATION: 'notification',
} as const;

/**
 * Message markers for AI response processing
 *
 * These markers control how responses are processed:
 * - DIRECT: Pass through response without AI reinterpretation
 * - KEYBOARD: Indicates inline keyboard JSON data follows
 * - KEYBOARD_END: Marks end of keyboard data
 * - PASSTHROUGH: Return to normal conversation flow
 */
export const MESSAGE_MARKERS = {
  DIRECT: '__DIRECT__',
  KEYBOARD: '__KEYBOARD__',
  KEYBOARD_END: '__END__',
  PASSTHROUGH: '__PASSTHROUGH__',
} as const;

/**
 * Keyboard types for inline buttons
 */
export const KEYBOARD_TYPES = {
  DOMAIN_REGISTER: 'domain_register',
  SERVER_ORDER: 'server_order',
} as const;

/**
 * Callback data prefixes for inline keyboard buttons
 *
 * Format: prefix:action:params
 * Examples:
 *   - domain_reg:example.com:15000
 *   - server_order:userId:index
 *   - server_cancel:userId
 */
export const CALLBACK_PREFIXES = {
  DOMAIN_REGISTER: 'domain_reg',
  DOMAIN_CANCEL: 'domain_cancel',
  SERVER_ORDER: 'server_order',
  SERVER_CANCEL: 'server_cancel',
  CONFIRM_DOMAIN_REGISTER: 'confirm_domain_register',
  CANCEL_DOMAIN_REGISTER: 'cancel_domain_register',
  SERVER_ORDER_CONFIRM: 'confirm_server_order',
  SERVER_ORDER_CANCEL: 'cancel_server_order',
  DELETE_CONFIRM: 'confirm_delete',
  DELETE_CANCEL: 'cancel_delete',
} as const;

/**
 * Transaction statuses for deposit system
 */
export const TRANSACTION_STATUS = {
  PENDING: 'pending',
  CONFIRMED: 'confirmed',
  CANCELLED: 'cancelled',
  REJECTED: 'rejected',
} as const;

/**
 * Transaction types for deposit system
 */
export const TRANSACTION_TYPE = {
  DEPOSIT: 'deposit',
  WITHDRAWAL: 'withdrawal',
  REFUND: 'refund',
} as const;

/**
 * Server order statuses
 */
export const SERVER_ORDER_STATUS = {
  PENDING: 'pending',
  PROVISIONING: 'provisioning',
  ACTIVE: 'active',
  SUSPENDED: 'suspended',
  TERMINATED: 'terminated',
  FAILED: 'failed',
} as const;

/**
 * Server actions
 */
export const SERVER_ACTION = {
  RECOMMEND: 'recommend',
  ORDER: 'order',
  START: 'start',
  STOP: 'stop',
  DELETE: 'delete',
  LIST: 'list',
  INFO: 'info',
  IMAGES: 'images',
} as const;

/**
 * Domain actions
 */
export const DOMAIN_ACTION = {
  REGISTER: 'register',
  CHECK: 'check',
  WHOIS: 'whois',
  LIST: 'list',
  INFO: 'info',
  GET_NS: 'get_ns',
  SET_NS: 'set_ns',
  PRICE: 'price',
  CHEAPEST: 'cheapest',
} as const;

/**
 * Deposit actions
 */
export const DEPOSIT_ACTION = {
  BALANCE: 'balance',
  ACCOUNT: 'account',
  REQUEST: 'request',
  HISTORY: 'history',
  CANCEL: 'cancel',
  PENDING: 'pending',
  CONFIRM: 'confirm',
  REJECT: 'reject',
} as const;

/**
 * Helper to create session key with user ID
 *
 * @param prefix - Session key prefix (from SESSION_KEYS)
 * @param userId - User ID (telegram_id or user identifier)
 * @returns Formatted session key
 *
 * @example
 * const key = sessionKey(SESSION_KEYS.DELETE_CONFIRM, '123456');
 * // Returns: 'delete_confirm:123456'
 */
export function sessionKey(prefix: string, userId: string | number): string {
  return `${prefix}:${userId}`;
}

/**
 * Helper to parse session key
 *
 * @param key - Full session key
 * @returns Object with prefix and userId, or null if invalid
 *
 * @example
 * const parsed = parseSessionKey('delete_confirm:123456');
 * // Returns: { prefix: 'delete_confirm', userId: '123456' }
 */
export function parseSessionKey(key: string): { prefix: string; userId: string } | null {
  const parts = key.split(':');
  if (parts.length !== 2) return null;
  return { prefix: parts[0], userId: parts[1] };
}

/**
 * Type guards for type safety
 */
export type SessionKeyPrefix = typeof SESSION_KEYS[keyof typeof SESSION_KEYS];
export type MessageMarker = typeof MESSAGE_MARKERS[keyof typeof MESSAGE_MARKERS];
export type KeyboardType = typeof KEYBOARD_TYPES[keyof typeof KEYBOARD_TYPES];
export type CallbackPrefix = typeof CALLBACK_PREFIXES[keyof typeof CALLBACK_PREFIXES];
export type TransactionStatus = typeof TRANSACTION_STATUS[keyof typeof TRANSACTION_STATUS];
export type TransactionType = typeof TRANSACTION_TYPE[keyof typeof TRANSACTION_TYPE];
export type ServerOrderStatus = typeof SERVER_ORDER_STATUS[keyof typeof SERVER_ORDER_STATUS];
export type ServerAction = typeof SERVER_ACTION[keyof typeof SERVER_ACTION];
export type DomainAction = typeof DOMAIN_ACTION[keyof typeof DOMAIN_ACTION];
export type DepositAction = typeof DEPOSIT_ACTION[keyof typeof DEPOSIT_ACTION];