import Vue, { VNode, VNodeDirective } from 'vue'
import { Readable } from 'stream'

export declare function createRenderer(options?: RendererOptions): Renderer

export declare function createBundleRenderer(
  bundle: string | object,
  options?: BundleRendererOptions
): BundleRenderer

type RenderCallback = (err: Error | null, html: string) => void

interface Renderer {
  renderToString(vm: Vue, callback: RenderCallback): void
  renderToString(vm: Vue, context: object, callback: RenderCallback): void
  renderToString(vm: Vue): Promise<string>
  renderToString(vm: Vue, context: object): Promise<string>

  renderToStream(vm: Vue, context?: object): Readable
}

interface BundleRenderer {
  renderToString(callback: RenderCallback): void
  renderToString(context: object, callback: RenderCallback): void
  renderToString(): Promise<string>
  renderToString(context: object): Promise<string>

  renderToStream(context?: object): Readable
}

interface RendererOptions {
  template?: string
  inject?: boolean
  shouldPreload?: (file: string, type: string) => boolean
  shouldPrefetch?: (file: string, type: string) => boolean
  cache?: RenderCache
  directives?: {
    [key: string]: (vnode: VNode, dir: VNodeDirective) => void
  }
}

interface BundleRendererOptions extends RendererOptions {
  clientManifest?: object
  serializer?: (state: object) => string
  runInNewContext?: boolean | 'once'
  basedir?: string
}

interface RenderCache {
  get: (key: string, cb?: (res: string) => void) => string | void
  set: (key: string, val: string) => void
  has?: (key: string, cb?: (hit: boolean) => void) => boolean | void
}
