/**
 * Shared constants for the extension.
 *
 * NOTE: This module is loaded by ES module contexts (background / popup /
 * options / tests). The content script is a classic script and duplicates the
 * small subset it needs (see src/content/content.js). The unit tests assert
 * that the duplicated constants stay in sync.
 */

export const PORT_NAME = 'translation-stream';

/** Maximum accepted selection length (characters). */
export const MAX_SELECTION_LENGTH = 20000;

/** Maximum length of the user-defined system prompt. */
export const MAX_USER_SYSTEM_PROMPT_LENGTH = 2000;

/** Context length presets (fixed values only). */
export const CONTEXT_PRESETS = [4096, 8192, 16384, 32768, 131072, 262144];

/** Supported target languages. */
export const LANGUAGES = [
  { code: 'ja', label: '日本語' },
  { code: 'en', label: 'English' },
  { code: 'zh-CN', label: '简体中文' },
  { code: 'zh-TW', label: '繁體中文' },
  { code: 'ko', label: '한국어' },
  { code: 'fr', label: 'Français' },
  { code: 'de', label: 'Deutsch' },
  { code: 'es', label: 'Español' },
  { code: 'pt', label: 'Português' },
  { code: 'ru', label: 'Русский' }
];

/** Thinking mode values accepted by the settings UI. */
export const THINKING_MODES = ['off', 'on', 'low', 'medium', 'high'];

/** Default Ollama endpoint. */
export const DEFAULT_OLLAMA_HOST = 'http://localhost:11434';

/** Error codes exchanged between background and content script. */
export const ERROR_CODES = {
  INVALID_REQUEST: 'INVALID_REQUEST',
  TEXT_EMPTY: 'TEXT_EMPTY',
  TEXT_TOO_LONG: 'TEXT_TOO_LONG',
  OLLAMA_UNAVAILABLE: 'OLLAMA_UNAVAILABLE',
  MODEL_NOT_FOUND: 'MODEL_NOT_FOUND',
  INVALID_SETTINGS: 'INVALID_SETTINGS',
  REQUEST_ABORTED: 'REQUEST_ABORTED',
  STREAM_ERROR: 'STREAM_ERROR',
  UNKNOWN_ERROR: 'UNKNOWN_ERROR'
};

/** Message types: content -> background (via runtime.Port). */
export const CONTENT_TO_BG = {
  TRANSLATE: 'translate',
  CANCEL: 'cancel'
};

/** Message types: background -> content (via runtime.Port). */
export const BG_TO_CONTENT = {
  STARTED: 'started',
  CHUNK: 'chunk',
  COMPLETED: 'completed',
  ERROR: 'error'
};

/** Message types: one-shot runtime messages (popup/options -> background). */
export const RUNTIME_MESSAGES = {
  LIST_MODELS: 'listModels'
};