/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

import random from "../random/random.ts";
import numbers from "./numbers.ts";
import unit from "./units.ts";

export default class font {
  static globalValue() {
    return random.pick(["inherit", "initial", "unset"]);
  }

  static style() {
    return random.pick(["italic", "normal", "oblique", "inherit"]);
  }

  static variant() {
    return random.pick(["normal", "small-caps", "inherit"]);
  }

  static weight() {
    return random.pick([
      /* standard */
      ["normal", "bold"],
      /* Relative to the parent */
      ["bolder", "lighter"],
      /* numeric values */
      [100, 200, 300, 400, 500, 600, 700, 800, 900]
    ]);
  }

  static size() {
    return random.pick([
      /* <absolute-size> values */
      [
        "xx-small",
        "x-small",
        "small",
        "medium",
        "large",
        "x-large",
        "xx-large"
      ],
      /* <relative-size> values */
      ["larger", "smaller"],
      /* <length> values */
      numbers.unsigned() + unit.unit(),
      /* <percentage> values */
      unit.percent()
    ]);
  }

  static relativeSize() {
    let value = random.number(8);
    return random.item(["", "+", "-"]) + value;
  }

  static genericFamily() {
    return random.pick([
      "serif",
      "sans-serif",
      "cursive",
      "fantasy",
      "monospace"
    ]);
  }

  static familyName() {
    return random.pick(["Times New Roman", "Arial", "Courier", "Helvetica"]);
  }

  static family() {
    let s = random.pick(font.familyName);
    if (random.chance(8)) {
      s += `, ${random.pick(font.genericFamily)}`;
    }
    return s;
  }

  static registeredFontFeatures() {
    return random.pick([
      "aalt",
      "abvf",
      "abvm",
      "abvs",
      "afrc",
      "akhn",
      "blwf",
      "blwm",
      "blws",
      "calt",
      "case",
      "ccmp",
      "cfar",
      "cjct",
      "clig",
      "cpct",
      "cpsp",
      "cswh",
      "curs",
      "cv01-cv99",
      "c2pc",
      "c2sc",
      "dist",
      "dlig",
      "dnom",
      "expt",
      "falt",
      "fin2",
      "fin3",
      "fina",
      "frac",
      "fwid",
      "half",
      "haln",
      "halt",
      "hist",
      "hkna",
      "hlig",
      "hngl",
      "hojo",
      "hwid",
      "init",
      "isol",
      "ital",
      "jalt",
      "jp78",
      "jp83",
      "jp90",
      "jp04",
      "kern",
      "lfbd",
      "liga",
      "ljmo",
      "lnum",
      "locl",
      "ltra",
      "ltrm",
      "mark",
      "med2",
      "medi",
      "mgrk",
      "mkmk",
      "mset",
      "nalt",
      "nlck",
      "nukt",
      "numr",
      "onum",
      "opbd",
      "ordn",
      "ornm",
      "palt",
      "pcap",
      "pkna",
      "pnum",
      "pref",
      "pres",
      "pstf",
      "psts",
      "pwid",
      "qwid",
      "rand",
      "rkrf",
      "rlig",
      "rphf",
      "rtbd",
      "rtla",
      "rtlm",
      "ruby",
      "salt",
      "sinf",
      "size",
      "smcp",
      "smpl",
      "ss01",
      "ss02",
      "ss03",
      "ss04",
      "ss05",
      "ss06",
      "ss07",
      "ss08",
      "ss09",
      "ss10",
      "ss11",
      "ss12",
      "ss13",
      "ss14",
      "ss15",
      "ss16",
      "ss17",
      "ss18",
      "ss19",
      "ss20",
      "subs",
      "sups",
      "swsh",
      "titl",
      "tjmo",
      "tnam",
      "tnum",
      "trad",
      "twid",
      "unic",
      "valt",
      "vatu",
      "vert",
      "vhal",
      "vjmo",
      "vkna",
      "vkrn",
      "vpal",
      "vrt2",
      "zero"
    ]);
  }

  static font() {
    let s = "";
    if (random.chance(4)) {
      s += `${random.pick(font.style)} `;
    }
    if (random.chance(4)) {
      s += `${random.pick(font.variant)} `;
    }
    if (random.chance(4)) {
      s += `${random.pick(font.weight)} `;
    }
    if (random.chance(4)) {
      s += `${numbers.any()}/`;
    }
    s += font.size();
    s += " ";
    s += font.family();
    return s;
  }
}