import { dialogBoxCreate } from "./ui/React/DialogBox";
import { BaseServer } from "./Server/BaseServer";
import { Generic_fromJSON, Generic_toJSON, Reviver } from "./utils/JSONReviver";
import { removeLeadingSlash, isInRootDirectory } from "./Terminal/DirectoryHelpers";

/**
 * Represents a plain text file that is typically stored on a server.
 */
export class TextFile {
  /**
   * The full file name.
   */
  fn: string;

  /**
   * The content of the file.
   */
  text: string;

  /**
   * The full file name.
   */
  get filename(): string {
    return this.fn;
  }

  /**
   * The full file name.
   */
  set filename(value: string) {
    this.fn = value;
  }

  constructor(fn = "", txt = "") {
    this.fn = (fn.endsWith(".txt") ? fn : `${fn}.txt`).replace(/\s+/g, "");
    this.text = txt;
  }

  /**
   * Concatenates the raw values to the end of current content.
   */
  append(txt: string): void {
    this.text += txt;
  }

  /**
   * Serves the file to the user as a downloadable resource through the browser.
   */
  download(): void {
    const filename: string = this.fn;
    const file: Blob = new Blob([this.text], { type: "text/plain" });
    /* tslint:disable-next-line:strict-boolean-expressions */
    const navigator = window.navigator as any;
    if (navigator.msSaveOrOpenBlob) {
      // IE10+
      navigator.msSaveOrOpenBlob(file, filename);
    } else {
      // Others
      const a: HTMLAnchorElement = document.createElement("a");
      const url: string = URL.createObjectURL(file);
      a.href = url;
      a.download = this.fn;
      document.body.appendChild(a);
      a.click();
      setTimeout(() => {
        document.body.removeChild(a);
        window.URL.revokeObjectURL(url);
      }, 0);
    }
  }

  /**
   * Retrieve the content of the file.
   */
  read(): string {
    return this.text;
  }

  /**
   * Shows the content to the user via the game's dialog box.
   */
  show(): void {
    dialogBoxCreate(`${this.fn}<br /><br />${this.text}`);
  }

  /**
   * Serialize the current file to a JSON save state.
   */
  toJSON(): any {
    return Generic_toJSON("TextFile", this);
  }

  /**
   * Replaces the current content with the text provided.
   */
  write(txt: string): void {
    this.text = txt;
  }

  /**
   * Initiatizes a TextFile from a JSON save state.
   */
  // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
  static fromJSON(value: any): TextFile {
    return Generic_fromJSON(TextFile, value.data);
  }
}

Reviver.constructors.TextFile = TextFile;

/**
 * Retrieve the file object for the filename on the specified server.
 * @param fn The file name to look for
 * @param server The server object to look in
 * @returns The file object, or null if it couldn't find it.
 */
export function getTextFile(fn: string, server: BaseServer): TextFile | null {
  let filename: string = !fn.endsWith(".txt") ? `${fn}.txt` : fn;

  if (isInRootDirectory(filename)) {
    filename = removeLeadingSlash(filename);
  }

  for (const file of server.textFiles as TextFile[]) {
    if (file.fn === filename) {
      return file;
    }
  }

  return null;
}

/**
 * Creates a TextFile on the target server.
 * @param fn The file name to create.
 * @param txt The contents of the file.
 * @param server The server that the file should be created on.
 * @returns The instance of the file.
 */
export function createTextFile(fn: string, txt: string, server: BaseServer): TextFile | undefined {
  if (getTextFile(fn, server) !== null) {
    // This should probably be a `throw`...
    /* tslint:disable-next-line:no-console */
    console.error(`A file named "${fn}" already exists on server ${server.hostname}.`);

    return undefined;
  }
  const file: TextFile = new TextFile(fn, txt);
  server.textFiles.push(file);

  return file;
}