Created basic state types

dataExample.json

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+{
+  "days": [
+    {
+      "events": [
+        {
+          "time": 0,
+          "lessons": [0, 1, 2, 3, 4, 5]
+        },
+        {
+          "time": 1,
+          "lessons": [0, 1, 2, 3, 4, 5]
+        }
+      ],
+      "date": 5467546
+    },
+    {
+      "events": [
+        {
+          "lessons": [0, 1, 2, 3, 4, 5]
+        }
+      ],
+      "date": 5467546
+    }
+  ],
+  "cards": [
+    {
+      "subject": 3,
+      "room": 505,
+      "teacher": 1
+    }
+  ],
+  "subjects": [
+    {
+      "title": "Math",
+      "teachers": ["Popov", "somebody"]
+    }
+  ]
+}

src/hooks.ts

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+import { useState } from "react";
+import {
+  TimetableT,
+  UseTimetableHookFT,
+  CreateCardFT,
+  CreateSubjectFT,
+} from "./types/timetable";
+
+export const useTimetable: UseTimetableHookFT = () => {
+  const [state, setState] = useState<TimetableT>({
+    cards: [],
+    days: [],
+    subjects: [],
+  });
+
+  const createSubject: CreateSubjectFT = () => {
+    console.log();
+  };
+
+  const createCard: CreateCardFT = () => {
+    console.log();
+  };
+
+  return { state, createCard, createSubject };
+};

src/types/timetable.ts

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+export type TimetableT = {
+  days: DayT[];
+  cards: CardT[];
+  subjects: SubjectT[];
+};
+
+type DayT = {
+  events: EventT[];
+  date: number; // epoch time
+};
+
+type EventT = {
+  lessons: number[]; // IDs
+};
+
+type CardT = {
+  subject: number; // ID
+  room: number; // Number
+  teacher: number; // ID in subject
+};
+
+type SubjectT = {
+  title: string;
+  teachers: string[]; // teachers allowed for this subject
+};
+
+export type CreateSubjectFT = (title: string, teachers: string[]) => void;
+
+export type CreateCardFT = (
+  subjectID: number,
+  teacherID: number,
+  room: number
+) => void;
+
+export type UseTimetableHookFT = () => {
+  createSubject: CreateSubjectFT;
+  createCard: CreateCardFT;
+  state: TimetableT;
+};