/**
 * @description 描述来自 Cloudflare trace 接口的地理信息。
 *
 * @example
 *   ```
 *   fl=1232f78
 *   h=www.cloudflare.com
 *   ip=23.132.124.129
 *   ts=1772261014.000
 *   visit_scheme=https
 *   uag=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36 Edg/144.0.0.0
 *   colo=SJC
 *   sliver=none
 *   http=http/2
 *   loc=US
 *   tls=TLSv1.3
 *   sni=plaintext
 *   warp=off
 *   gateway=off
 *   rbi=off
 *   kex=X25519MLKEM768
 *   ```
 */
export interface GeoInfoFromCloudflare {
  /**
   * @description Data center request was handled at (Cloudflare internal code)
   */
  fl?: string | undefined
  /**
   * @description Hostname of the incoming HTTP request
   */
  h?: string | undefined
  /**
   * @description Client IP address detected by Cloudflare
   */
  ip?: string | undefined
  /**
   * @description Timestamp of request (in seconds)
   */
  ts?: string | undefined
  /**
   * @description Request scheme used by the visitor (for example: http/https)
   */
  visit_scheme?: string | undefined
  /**
   * @description User-Agent header value
   */
  uag?: string | undefined
  /**
   * @description IATA-like code of the Cloudflare edge location
   */
  colo?: string | undefined
  /**
   * @description Cloudflare edge “sliver” identifier
   */
  sliver?: string | undefined
  /**
   * @description HTTP protocol version used for the request
   */
  http?: string | undefined
  /**
   * @description Country code inferred from client IP (ISO 3166-1 alpha-2)
   */
  loc?: string | undefined
  /**
   * @description TLS protocol version negotiated for the connection
   */
  tls?: string | undefined
  /**
   * @description Server Name Indication (SNI) mode
   */
  sni?: string | undefined
  /**
   * @description Whether WARP is enabled for the client
   */
  warp?: string | undefined
  /**
   * @description Whether Cloudflare Gateway is enabled for the client
   */
  gateway?: string | undefined
  /**
   * @description Whether browser isolation (RBI) is enabled
   */
  rbi?: string | undefined
  /**
   * @description Key exchange algorithm used by TLS
   */
  kex?: string | undefined
}
/**
 * @description Parse geolocation information from Cloudflare trace response.
 */
const parseGeoInfoFromCloudflare = (text: string): GeoInfoFromCloudflare => {
  const pairs = text
    .split("\n")
    .map((pair: string) => pair.split("="))
    .filter(([key]) => key !== "")
  const result = pairs.reduce((geo: GeoInfoFromCloudflare, pair) => {
    const [key, value] = pair
    if (key !== undefined) {
      geo[key as keyof GeoInfoFromCloudflare] = value
    }
    return geo
  }, {})
  return result
}
/**
 * @description Get device geolocation information from Cloudflare
 *
 * @see {@link https://dev.to/brojenuel/get-ip-clients-addresses-6k6}
 * @see {@link https://dataflowkit.com/blog/determine-location-of-users/}
 */
export const getGeoInfoFromCloudflare = async (): Promise<GeoInfoFromCloudflare> => {
  const response = await fetch("https://www.cloudflare.com/cdn-cgi/trace", {
    method: "GET",
    mode: "cors",
    credentials: "omit",
  })
  const responseText = await response.text()
  const geo = parseGeoInfoFromCloudflare(responseText)

  return geo
}

/**
 * @description 描述来自 ipapi 响应的地理信息。
 *
 * @example
 *   ```
 *   {
 *     "ip": "23.132.124.129",
 *     "network": "23.132.124.0/24",
 *     "version": "IPv4",
 *     "city": "Los Angeles",
 *     "region": "California",
 *     "region_code": "CA",
 *     "country": "US",
 *     "country_name": "United States",
 *     "country_code": "US",
 *     "country_code_iso3": "USA",
 *     "country_capital": "Washington",
 *     "country_tld": ".us",
 *     "continent_code": "NA",
 *     "in_eu": false,
 *     "postal": "90001",
 *     "latitude": 34.05223,
 *     "longitude": -118.24368,
 *     "timezone": "America/Los_Angeles",
 *     "utc_offset": "-0800",
 *     "country_calling_code": "+1",
 *     "currency": "USD",
 *     "currency_name": "Dollar",
 *     "languages": "en-US,es-US,haw,fr",
 *     "country_area": 9629091,
 *     "country_population": 327167434,
 *     "asn": "AS7018",
 *     "org": "AT&T Enterprises, LLC"
 *   }
 *   ```
 */
export interface GeoInfoFromIpapi {
  /**
   * @description Public (external) IP address (same as URL ip).
   */
  ip?: string | undefined
  /**
   * @description Network address in CIDR notation.
   */
  network?: string | undefined
  /**
   * @description IP version (IPv4 or IPv6).
   */
  version?: string | undefined
  /**
   * @description City name.
   */
  city?: string | undefined
  /**
   * @description Region name (administrative division).
   */
  region?: string | undefined
  /**
   * @description Region code.
   */
  region_code?: string | undefined
  /**
   * @description Country code (2 letter, ISO 3166-1 alpha-2).
   */
  country?: string | undefined
  /**
   * @description Short country name.
   */
  country_name?: string | undefined
  /**
   * @description Country code (2 letter, ISO 3166-1 alpha-2).
   */
  country_code?: string | undefined
  /**
   * @description Country code (3 letter, ISO 3166-1 alpha-3).
   */
  country_code_iso3?: string | undefined
  /**
   * @description Capital of the country.
   */
  country_capital?: string | undefined
  /**
   * @description Country specific TLD (top-level domain).
   */
  country_tld?: string | undefined
  /**
   * @description Continent code.
   */
  continent_code?: string | undefined
  /**
   * @description Whether IP address belongs to a country that is a member of the European Union (EU).
   */
  in_eu?: boolean | undefined
  /**
   * @description Postal code / zip code.
   */
  postal?: string | undefined
  /**
   * @description Latitude coordinate.
   */
  latitude?: number | undefined
  /**
   * @description Longitude coordinate.
   */
  longitude?: number | undefined
  /**
   * @description Timezone (IANA format i.e. “Area/Location”).
   */
  timezone?: string | undefined
  /**
   * @description UTC offset (with daylight saving time) as `+HHMM` or `-HHMM` (HH is hours, MM is minutes).
   */
  utc_offset?: string | undefined
  /**
   * @description Country calling code (dial in code, comma separated).
   */
  country_calling_code?: string | undefined
  /**
   * @description Currency code (ISO 4217 format).
   */
  currency?: string | undefined
  /**
   * @description Currency name.
   */
  currency_name?: string | undefined
  /**
   * @description Languages spoken (comma separated 2 or 3 letter ISO 639 code with optional hyphen separated
   * country suffix).
   */
  languages?: string | undefined
  /**
   * @description Area of the country (in sq km).
   */
  country_area?: number | undefined
  /**
   * @description Population of the country.
   */
  country_population?: number | undefined
  /**
   * @description Autonomous System Number.
   */
  asn?: string | undefined
  /**
   * @description Organization name.
   */
  org?: string | undefined
  /**
   * @description Host or domain name associated with the IP (*optional beta add-on, please contact us for
   * details).
   */
  hostname?: string | undefined
}
/**
 * @description Get geographical information from IP address using ipapi.co API.
 *
 * @see {@link https://ipapi.co/}
 */
export const getGeoInfoFromIpapi = async (): Promise<GeoInfoFromIpapi> => {
  const response = await fetch(`https://ipapi.co/json/`, {
    method: "GET",
    mode: "cors",
    credentials: "omit",
  })
  const geo = (await response.json()) as GeoInfoFromIpapi
  return geo
}

/**
 * @description 描述来自 ipify API 的公网 IP 信息。
 *
 * @example
 *   ```
 *   {
 *     "ip": "23.132.124.129"
 *   }
 *   ```
 */
export interface GeoInfoFromIpify {
  ip: string
}
/**
 * @description Get public IP address using ipify API.
 *
 * @see {@link https://www.ipify.org/}
 */
export const getGeoInfoFromIpify = async (): Promise<GeoInfoFromIpify> => {
  const response = await fetch("https://api.ipify.org?format=json", {
    method: "GET",
  })
  const geo = (await response.json()) as GeoInfoFromIpify
  return geo
}

/**
 * @description Describe aggregated geolocation data from all providers.
 */
export interface GeoInfo {
  cloudflare: GeoInfoFromCloudflare
  ipapi: GeoInfoFromIpapi
  ipify: GeoInfoFromIpify
}
/**
 * @description Get geographical information from multiple sources.
 */
export const getGeoInfo = async (): Promise<GeoInfo> => {
  const [cloudflare, ipapi, ipify] = await Promise.all([
    getGeoInfoFromCloudflare(),
    getGeoInfoFromIpapi(),
    getGeoInfoFromIpify(),
  ])
  return { cloudflare, ipapi, ipify }
}