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import Document from './document.js'
import LazyResult from './lazy-result.js'
import NoWorkResult from './no-work-result.js'
import {
  AcceptedPlugin,
  Plugin,
  ProcessOptions,
  TransformCallback,
  Transformer
} from './postcss.js'
import Result from './result.js'
import Root from './root.js'

declare namespace Processor {
  export { Processor_ as default }
}

/**

 * Contains plugins to process CSS. Create one `Processor` instance,

 * initialize its plugins, and then use that instance on numerous CSS files.

 *

 * ```js

 * const processor = postcss([autoprefixer, postcssNested])

 * processor.process(css1).then(result => console.log(result.css))

 * processor.process(css2).then(result => console.log(result.css))

 * ```

 */
declare class Processor_ {
  /**

   * Plugins added to this processor.

   *

   * ```js

   * const processor = postcss([autoprefixer, postcssNested])

   * processor.plugins.length //=> 2

   * ```

   */
  plugins: (Plugin | TransformCallback | Transformer)[]

  /**

   * Current PostCSS version.

   *

   * ```js

   * if (result.processor.version.split('.')[0] !== '6') {

   *   throw new Error('This plugin works only with PostCSS 6')

   * }

   * ```

   */
  version: string

  /**

   * @param plugins PostCSS plugins

   */
  constructor(plugins?: readonly AcceptedPlugin[])

  /**

   * Parses source CSS and returns a `LazyResult` Promise proxy.

   * Because some plugins can be asynchronous it doesn’t make

   * any transformations. Transformations will be applied

   * in the `LazyResult` methods.

   *

   * ```js

   * processor.process(css, { from: 'a.css', to: 'a.out.css' })

   *   .then(result => {

   *      console.log(result.css)

   *   })

   * ```

   *

   * @param css String with input CSS or any object with a `toString()` method,

   *            like a Buffer. Optionally, send a `Result` instance

   *            and the processor will take the `Root` from it.

   * @param opts Options.

   * @return Promise proxy.

   */
  process(
    css: { toString(): string } | LazyResult | Result | Root | string
  ): LazyResult | NoWorkResult
  process<RootNode extends Document | Root = Root>(
    css: { toString(): string } | LazyResult | Result | Root | string,
    options: ProcessOptions<RootNode>
  ): LazyResult<RootNode>

  /**

   * Adds a plugin to be used as a CSS processor.

   *

   * PostCSS plugin can be in 4 formats:

   * * A plugin in `Plugin` format.

   * * A plugin creator function with `pluginCreator.postcss = true`.

   *   PostCSS will call this function without argument to get plugin.

   * * A function. PostCSS will pass the function a {@link Root}

   *   as the first argument and current `Result` instance

   *   as the second.

   * * Another `Processor` instance. PostCSS will copy plugins

   *   from that instance into this one.

   *

   * Plugins can also be added by passing them as arguments when creating

   * a `postcss` instance (see [`postcss(plugins)`]).

   *

   * Asynchronous plugins should return a `Promise` instance.

   *

   * ```js

   * const processor = postcss()

   *   .use(autoprefixer)

   *   .use(postcssNested)

   * ```

   *

   * @param plugin PostCSS plugin or `Processor` with plugins.

   * @return Current processor to make methods chain.

   */
  use(plugin: AcceptedPlugin): this
}

declare class Processor extends Processor_ {}

export = Processor