Adds preference model

src/constants/days.ts

@@ -0,0 +1,29 @@
+export default class Days {
+  static get SUNDAY() {
+    return 0;
+  }
+
+  static get MONDAY() {
+    return 1;
+  }
+
+  static get TUESDAY() {
+    return 2;
+  }
+
+  static get WEDNESDAY() {
+    return 3;
+  }
+
+  static get THURSDAY() {
+    return 4;
+  }
+
+  static get FRIDAY() {
+    return 5;
+  }
+
+  static get SATURDAY() {
+    return 6;
+  }
+}

src/models/preference.test.ts

@@ -0,0 +1,26 @@
+import Days from '../constants/days';
+import Preference from './preference';
+
+it('sets the preference type to next available', async () => {
+  const preference = new Preference;
+
+  expect(preference.next()).toHaveProperty('attributes', {
+    day: null,
+    end: null,
+    start: null,
+    type: Preference.NEXT_AVAILABLE,
+  });
+});
+
+it('sets the preference type to next available', async () => {
+  const end = '1:00 PM';
+  const start = '9:00 AM';
+  const preference = new Preference;
+
+  expect(preference.on(Days.MONDAY).between(start, end)).toHaveProperty('attributes', {
+    day: Days.MONDAY,
+    end,
+    start,
+    type: Preference.CERTAIN_DAYS,
+  });
+});

src/models/preference.ts

@@ -0,0 +1,46 @@
+import { Preferable } from '../types/models';
+import { PreferableParameters } from '../types/parameters';
+
+const NEXT_AVAILABLE = 1;
+const CERTAIN_DAYS = 2;
+
+export default class Preference implements Preferable {
+  protected attributes: PreferableParameters;
+
+  constructor() {
+    this.attributes = {
+      day: null,
+      end: null,
+      start: null,
+      type: null,
+    }
+  }
+
+  public between(start: string, end: string): this {
+    this.attributes.end = end;
+    this.attributes.start = start;
+
+    return this;
+  }
+
+  public next(): this {
+    this.attributes.type = NEXT_AVAILABLE;
+
+    return this;
+  }
+
+  public on(day: number): this {
+    this.attributes.day = day;
+    this.attributes.type = CERTAIN_DAYS;
+
+    return this;
+  }
+
+  static get NEXT_AVAILABLE() {
+    return NEXT_AVAILABLE;
+  }
+
+  static get CERTAIN_DAYS() {
+    return CERTAIN_DAYS;
+  }
+}

src/types/models.d.ts

@@ -3,3 +3,11 @@ export interface Answerable {
 
   is(value: string): this;
 }
+
+export interface Preferable {
+  between(start: string, end: string): this;
+
+  next(): this;
+
+  on(day: number): this;
+}

src/types/parameters.d.ts

@@ -9,6 +9,13 @@ export interface LocationParameters {
   user?: number | string;
 }
 
+export interface PreferableParameters {
+  day?: number | null;
+  end?: string | null;
+  start?: string | null;
+  type?: number | null;
+}
+
 export interface QuestionParameters {
   service?: number | number[] | string | string[];
 }