// ============================================================================
// Extraction
// ============================================================================

/**
 * @description Get the basename (filename with extension) from a path.
 *
 * @example
 *   ```
 *   // Expect: 'file.ts'
 *   type Example1 = PathBasename<'src/components/file.ts'>
 *   ```
 */
export type PathBasename<S extends string> = S extends `${string}/${infer Rest}`
  ? PathBasename<Rest>
  : S

/**
 * @description Get the directory name from a path.
 *
 * @example
 *   ```
 *   // Expect: 'src/components'
 *   type Example1 = PathDirname<'src/components/file.ts'>
 *   ```
 */
export type PathDirname<S extends string> = S extends `${infer Dir}/${infer _Rest}`
  ? _Rest extends `${string}/${string}`
    ? `${Dir}/${PathDirname<_Rest>}`
    : Dir
  : "."

/**
 * @description Get the file extension from a path.
 *
 * @example
 *   ```
 *   // Expect: '.ts'
 *   type Example1 = PathExtname<'file.ts'>
 *   // Expect: '.spec.ts'
 *   type Example2 = PathExtname<'file.spec.ts'>
 *   ```
 */
export type PathExtname<S extends string> = S extends `${infer _Base}.${infer Ext}`
  ? Ext extends `${string}.${string}`
    ? `.${Ext}`
    : `.${Ext}`
  : ""

// ============================================================================
// Manipulation
// ============================================================================

/**
 * @description Join path segments with '/'.
 *
 * @example
 *   ```
 *   // Expect: 'src/components/Button.tsx'
 *   type Example1 = PathJoin<['src', 'components', 'Button.tsx']>
 *   ```
 */
export type PathJoin<T extends readonly string[]> = T extends [
  infer First extends string,
  ...infer Rest extends string[],
]
  ? Rest extends []
    ? First
    : `${First}/${PathJoin<Rest>}`
  : ""