import {
  Appearance,
  AppState,
  Dimensions,
  I18nManager,
  NativeModules,
  Platform,
} from "react-native";

import type { AppInfo, DeviceContext } from "../types";
import { CONSTANTS } from "../constants";

const resolveLocale = (): string => {
  const settingsManager = NativeModules.SettingsManager;
  const localeFromIos =
    settingsManager?.settings?.AppleLocale ??
    settingsManager?.settings?.AppleLanguages?.[0];
  const localeFromAndroid = NativeModules.I18nManager?.localeIdentifier;

  return (
    localeFromIos ??
    localeFromAndroid ??
    Intl.DateTimeFormat().resolvedOptions().locale ??
    (I18nManager.isRTL ? "ar" : "en")
  );
};

const resolveTimezone = (): string => {
  return Intl.DateTimeFormat().resolvedOptions().timeZone ?? "UTC";
};

const resolveDeviceType = (width: number): DeviceContext["deviceType"] => {
  if (width >= 1024) {
    return "tablet";
  }
  return "mobile";
};

export const getDefaultDeviceContext = (appInfo: AppInfo = {}): DeviceContext => {
  const window = Dimensions.get("window");
  const colorScheme = Appearance.getColorScheme();

  return {
    sdkVersion: CONSTANTS.sdkVersion,
    platform: Platform.OS,
    platformVersion: String(Platform.Version),
    deviceType: resolveDeviceType(window.width),
    locale: resolveLocale(),
    timezone: resolveTimezone(),
    appState: AppState.currentState,
    colorScheme: colorScheme === "unspecified" ? null : colorScheme,
    screen: {
      width: window.width,
      height: window.height,
      scale: window.scale,
      fontScale: window.fontScale,
    },
    app: appInfo,
  };
};