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import each from "https://deno.land/x/lodash/each.js";
export default class Controller {  static get name() {    return `${this}`.split(" ")[1];  }
  /**   * Perform a request using an action method on this controller.   */  static perform(action, app) {    return async (context) => {      const controller = new this(context, app);      const handler = controller[action].bind(controller);      const params = context.request.params;
      try {        app.log.info(`Performing ${this.name}#${action}`);        await handler(params);      } catch (e) {        app.log.error(e);        context.response.body = e.message;        context.response.status = 500;        context.response.headers.set("Content-Type", "text/html");      }    };  }
  constructor(context, app) {    this.request = context.request;    this.response = context.response;    this.status = 200;    this.headers = {      "Content-Type": "text/html; charset=utf-8",    };    this.app = app;    this.routes = app.routes;    this.initialize();  }
  /**   * Executed when the controller is instantiated, prior to the request   * being fulfilled.   */  initialize() {}
  /**   * All methods on this controller that aren't defined on the   * superclass are considered actions.   */  get actions() {    return Object.keys(this).filter(      (key) =>        typeof this[key] === "function" && typeof super[key] === "undefined",    );  }
  get format() {    return this.request.accepts()[0].replace("text/", "");  }
  /**   * Prepare the response for rendering by setting its status and   * headers based on the information in the controller.   */  prepare() {    this.response.status = this.status;    const bytes = encodeURIComponent(this.response.body).match(/%[89ABab]/g);    const length = this.response.body.length + (bytes ? bytes.length : 0);    this.headers["Content-Length"] = length;
    each(this.headers, (value, header) =>      this.response.headers.set(header, value),    );  }
  /**   * Render the given view's template using an instance as context.   */  async render(View, context = {}) {    const view = new View(this, context);    const result = await view.template.render(view);    const html = result.toString();
    this.response.body = html;    this.headers["Content-Type"] = this.request.accepts()[0];
    this.prepare();  }
  /**   * Redirect to an entirely new location   */  redirect(action, options) {    const controller = options.controller || this;    const params = options.params || {};    const url = this.app.routes.resolve(controller, action, params);    this.status = 301;    this.headers["Location"] = url;    this.response.body = `You are being <a href="${url}">redirected</a>`;
    this.app.log.info(`Redirecting to ${url} as ${this.status}`);    this.prepare();  }
  /**   * Return an empty response with a status code.   *   * @param number status - HTTP status code   */  head(status) {    this.status = status;    this.prepare();  }}