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import { APIResponse as IResponse } from '../types.d.ts'import log from '../shared/log.ts'import compress from './compress.ts'
export class APIResponse implements IResponse {  status = 200  headers = new Headers()  body?: string | Uint8Array | ArrayBuffer | ReadableStream<Uint8Array>
  addHeader(key: string, value: string): this {    this.headers.append(key, value)    return this  }
  setHeader(key: string, value: string): this {    this.headers.set(key, value)    return this  }
  removeHeader(key: string): this {    this.headers.delete(key)    return this  }
  redirect(url: string, status = 302): this {    this.setHeader('Location', url)    this.status = status    return this  }
  json(data: any, space?: string | number): this {    this.setHeader('Content-Type', 'application/json; charset=utf-8')    this.body = JSON.stringify(data, undefined, space)    return this  }
  async writeTo({ request, respondWith }: Deno.RequestEvent, status?: number): Promise<void> {    let { body, headers, } = this    let contentType: string | null = null    if (headers.has('Content-Type')) {      contentType = headers.get('Content-Type')!    } else if (typeof body === 'string') {      contentType = 'text/plain; charset=utf-8'      headers.set('Content-Type', contentType)    }    if (!headers.has('Date')) {      headers.set('Date', (new Date).toUTCString())    }
    const acceptEncoding = request.headers.get('accept-encoding')    if (acceptEncoding && body && contentType) {      let data = new Uint8Array()      if (typeof body === 'string') {        data = new TextEncoder().encode(body)      } else if (body instanceof Uint8Array) {        data = body      } else if (body instanceof ArrayBuffer) {        data = new Uint8Array(body)      }      const contentEncoding = compress.accept(acceptEncoding, contentType, data.length)      if (contentEncoding) {        body = await compress.compress(data, contentEncoding)        headers.set('Vary', 'Origin')        headers.set('Content-Encoding', contentEncoding)      }    }
    try {      await respondWith(new Response(body, { headers, status: status || this.status }))    } catch (err) {      log.warn('http:', err.message)    }  }}