feat: add '/units' endpoints; add 'put' and 'delete' requests to '/dictionaries' endpoint

server/routers/kfu-m-24-1/eng-it-lean/units/data/unit-1.md

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+# Unit 1. Multifunctional Verbs: Be, Have, and Do
+
+## Overview
+
+This unit focuses on the use of multifunctional verbs in English. These verbs are able to express multiple meanings depending on their use in a sentence.
+
+## Learning Objectives
+
+By the end of this unit, you will be able to:
+
+- Identify the different forms of the main multifunctional verb.
+- Explain how these forms can be used interchangeably in sentences.
+- Demonstrate the correct usage of the three forms of the multifunctional verb by providing sentences and examples.
+
+## Vocabulary Review
+
+| Term | Definition                                               |
+| ---- | -------------------------------------------------------- |
+| Be   | To express a present or ongoing state of being.          |
+| Have | To express ownership or possession.                      |
+| Do   | To express an action to be done, future action or habit. |
+
+## Activities
+
+### Activity 1: Identify the Different Forms of the Main Multifunctional Verb
+
+- Read through each sentence and identify if the verb is used in its present tense (is), past tense (was/were), or future tense (will, would).
+- Discuss how this usage can vary depending on context.
+- Write down sentences that use different forms to illustrate your points.
+
+1. **Sentence 1**: "The cat is sleeping."
+
+   - Present tense: The cat is sleeping.
+   - Past tense: The cat slept.
+   - Future tense: The cat will sleep.
+
+2. **Sentence 2**: "I have a dog at home."
+
+   - Present tense: I have a dog.
+   - Past tense: I had a dog.
+   - Future tense: I will have a dog.
+
+3. **Sentence 3**: "We are going on a hike tomorrow."
+
+   - Present tense: We are going on a hike.
+   - Past tense: We went on a hike.
+   - Future tense: We will go on a hike.
+
+4. **Sentence 4**: "He has been studying all day."
+
+   - Present tense: He is studying.
+   - Past tense: He studied.
+   - Future tense: He will study.
+
+5. **Sentence 5**: "We are going to buy some groceries later today."
+   - Present tense: We are going to buy some groceries.
+   - Past tense: We bought some groceries.
+   - Future tense: We will buy some groceries.
+
+### Activity 2: Explain How These Forms Can Be Used Interchangeably in Sentences
+
+- Read through a sentence and identify the present, past, and future tense uses.
+- In pairs, explain why these forms are used interchangeably.
+- Provide examples of sentences that demonstrate this usage.
+- Highlight how the context changes the meaning.
+
+### Activity 3: Correct Usage of the Three Forms of the Multifunctional Verb
+
+- Read through a sentence and identify which form is being used.
+- In pairs, discuss why these forms are used in certain situations.
+- Provide sentences that demonstrate the correct usage of the three forms.

server/routers/kfu-m-24-1/eng-it-lean/units/data/units.json

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+[{"id":0,"filename":"unit-1","name":"Unit 1: Multifunctional Verbs: Be, Have, and Do"}]

server/routers/kfu-m-24-1/eng-it-lean/units/index.js

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+const fs = require('fs');
+const path = require('path');
+const router = require('express').Router();
+
+module.exports = router;
+
+const data = require('./data/units.json');
+router.get('/', (req, res) => {
+  res.send(data);
+});
+
+router.put('/', (req, res) => {
+	const newUnit = req.body
+
+	if (!newUnit) {
+		return res.status(400).send('No new unit to be added')
+	}
+
+	if (!data) {
+		return res.status(500).send('No data to be updated')
+	}
+
+	data.push({ "id": data.length, ...newUnit })
+
+	fs.writeFileSync(path.join(__dirname, 'data', 'units.json'), JSON.stringify(data));
+	res.status(200).send(data);
+});
+
+router.delete('/:id', (req, res) => {
+	const id = parseInt(req.params.id);
+	const index = data.findIndex((unit) => unit.id === id);
+
+	if (index < 0) {
+		return res.status(404).send('Not found');
+	}
+
+	data.splice(index, 1);
+	fs.writeFileSync(path.join(__dirname, 'data', 'units.json'), JSON.stringify(data));
+	res.send({ message: `Unit with ID ${id} deleted` });
+});
+
+router.get('/:id', (req, res) => {
+  const id = parseInt(req.params.id);
+  const unit = data.find((unit) => unit.id === id);
+
+  if (!unit) {
+    return res.status(404).send('Not found');
+  }
+
+  const unitFilepath = path.join(__dirname, 'data', `${unit.filename}.md`);
+  const unitContent = fs.readFileSync(unitFilepath, 'utf-8');
+
+  if (!unitContent) {
+    return res.status(404).send('Not found');
+  }
+
+  res.send({ ...unit, content: unitContent });
+});