export const defaultAppHeaders = () => {
  return {
    'HTTP-Referer': 'https://cherry-ai.com',
    'X-Title': 'Cherry Studio'
  }
}

// Following two function are not being used for now.
// I may use them in the future, so just keep them commented. - by eurfelux

/**
 * Converts an `undefined` value to `null`, otherwise returns the value as-is.
 * @param value - The value to check
 * @returns `null` if the input is `undefined`; otherwise the input value
 */

// export function toNullIfUndefined<T>(value: T | undefined): T | null {
//   if (value === undefined) {
//     return null
//   } else {
//     return value
//   }
// }

/**
 * Converts a `null` value to `undefined`, otherwise returns the value as-is.
 * @param value - The value to check
 * @returns `undefined` if the input is `null`; otherwise the input value
 */

// export function toUndefinedIfNull<T>(value: T | null): T | undefined {
//   if (value === null) {
//     return undefined
//   } else {
//     return value
//   }
// }

/**
 * Extracts the trailing API version segment from a URL path.
 *
 * This function extracts API version patterns (e.g., `v1`, `v2beta`) from the end of a URL.
 * Only versions at the end of the path are extracted, not versions in the middle.
 * The returned version string does not include leading or trailing slashes.
 *
 * @param {string} url - The URL string to parse.
 * @returns {string | undefined} The trailing API version found (e.g., 'v1', 'v2beta'), or undefined if none found.
 *
 * @example
 * getTrailingApiVersion('https://api.example.com/v1') // 'v1'
 * getTrailingApiVersion('https://api.example.com/v2beta/') // 'v2beta'
 * getTrailingApiVersion('https://api.example.com/v1/chat') // undefined (version not at end)
 * getTrailingApiVersion('https://gateway.ai.cloudflare.com/v1/xxx/v1beta') // 'v1beta'
 * getTrailingApiVersion('https://api.example.com') // undefined
 */
export function getTrailingApiVersion(url: string): string | undefined {
  const match = url.match(TRAILING_VERSION_REGEX)

  if (match) {
    // Extract version without leading slash and trailing slash
    return match[0].replace(/^\//, '').replace(/\/$/, '')
  }

  return undefined
}

/**
 * Matches an API version at the end of a URL (with optional trailing slash).
 * Used to detect and extract versions only from the trailing position.
 */
const TRAILING_VERSION_REGEX = /\/v\d+(?:alpha|beta)?\/?$/i

/**
 * Removes the trailing API version segment from a URL path.
 *
 * This function removes API version patterns (e.g., `/v1`, `/v2beta`) from the end of a URL.
 * Only versions at the end of the path are removed, not versions in the middle.
 *
 * @param {string} url - The URL string to process.
 * @returns {string} The URL with the trailing API version removed, or the original URL if no trailing version found.
 *
 * @example
 * withoutTrailingApiVersion('https://api.example.com/v1') // 'https://api.example.com'
 * withoutTrailingApiVersion('https://api.example.com/v2beta/') // 'https://api.example.com'
 * withoutTrailingApiVersion('https://api.example.com/v1/chat') // 'https://api.example.com/v1/chat' (no change)
 * withoutTrailingApiVersion('https://api.example.com') // 'https://api.example.com'
 */
export function withoutTrailingApiVersion(url: string): string {
  return url.replace(TRAILING_VERSION_REGEX, '')
}