import { readFile, writeFile, unlink } from 'node:fs/promises';
import { emojiVersion } from '../lib/emoji/data';
import { getEmojiSequenceFromString } from '../lib/emoji/cleanup';
import { getEmojiSequenceString } from '../lib/emoji/format';
import {
	getQualifiedEmojiSequencesMap,
	parseEmojiTestFile,
} from '../lib/emoji/test/parse';
import { getQualifiedEmojiVariations } from '../lib/emoji/test/variations';

describe('Qualified variations of emoji sequences', () => {
	async function fetchEmojiTestData(): Promise<string | undefined> {
		// Fetch emojis, cache it
		const source = `tests/fixtures/download-emoji-${emojiVersion}.txt`;

		let data: string | undefined;
		try {
			data = await readFile(source, 'utf8');
		} catch {
			//
		}

		if (!data) {
			data = (
				await fetch(
					`https://unicode.org/Public/emoji/${emojiVersion}/emoji-test.txt`
				)
			)
				.text()
				.toString();
			await writeFile(source, data, 'utf8');
		}

		// Test content, unlink cache on failure
		if (data.indexOf(`# Version: ${emojiVersion}`) === -1) {
			try {
				await unlink(source);
			} catch {
				//
			}
			return;
		}
		return data;
	}

	it('Variations without test data', () => {
		const sequences = [
			// simple emoji, twice to check duplicates
			'1F601',
			'1F601 FE0F',
			// 2 simple emojis
			'1F635 200D 1F4AB',
			// simple emoji with variation
			'00A9 FE0F',
			// keycap with and without variation
			'0031 FE0F 20E3',
			'0033 20E3',
			// complex emojis
			'1F1E6 1F1F8',
			'1F3F4 E0067 E0062 E0065 E006E E0067 E007F',
			// mix of simple and complex, with and without variation
			'1F9D7 1F3FE 200D 2640 FE0F',
			'1F9D7 1F3FF 200D 2642 ',
		].map(getEmojiSequenceFromString);
		const results = getQualifiedEmojiVariations(sequences);
		expect(
			results.map((sequence) =>
				getEmojiSequenceString(sequence, {
					separator: ' ',
					case: 'upper',
					format: 'utf-32',
					add0: true,
				})
			)
		).toEqual([
			// simple emoji
			'1F601 FE0F',
			// 2 simple emojis
			'1F635 FE0F 200D 1F4AB FE0F',
			// simple emoji with variation
			'00A9 FE0F',
			// keycap with and without variation
			'0031 FE0F 20E3',
			'0033 FE0F 20E3',
			// complex emojis
			'1F1E6 1F1F8',
			'1F3F4 E0067 E0062 E0065 E006E E0067 E007F',
			// mix of simple and complex, with and without variation
			'1F9D7 1F3FE 200D 2640 FE0F',
			'1F9D7 1F3FF 200D 2642 FE0F',
		]);
	});

	it('Variations with test data', async () => {
		// Fetch emojis, cache it
		const data = await fetchEmojiTestData();
		if (!data) {
			console.warn('Test skipped: test data is not available');
			return;
		}

		const testData = parseEmojiTestFile(data);
		const testDataSequences = testData.map((item) => item.sequence);

		// Make sure testData contains both fully-qualified and unqualified emojis
		const testDataStrings = new Set(testData.map((item) => item.code));
		expect(testDataStrings.has('1f600')).toBe(true);
		expect(testDataStrings.has('263a')).toBe(true);
		expect(testDataStrings.has('263a-fe0f')).toBe(true);

		// Test getQualifiedEmojiSequencesMap
		const unqualifiedTest = getQualifiedEmojiSequencesMap(
			testDataSequences,
			getEmojiSequenceString
		);
		expect(unqualifiedTest['1f600']).toBe('1f600');
		expect(unqualifiedTest['263a']).toBe('263a-fe0f');

		// Sequences to test
		const sequences = [
			// emoji without variation in test file
			'1F601',
			'1F635 200D 1F4AB',
			// emojis without variations in test file, but variations in source
			'1F60D FE0F',
			// emoji that has variation in test file
			'263A',
			// keycap
			'0030 20E3',
			'0034 FE0F 20E3',
			// complex emoji, exists in file
			'1F9D1 1F3FE 200D 2764 200D 1F9D1 1F3FB',
			// simple emoji, not in test file
			'1234',
			// fake keycap, not in test file
			'2345 20E3 200D 1235',
		].map(getEmojiSequenceFromString);
		const results = getQualifiedEmojiVariations(
			sequences,
			testDataSequences
		);
		expect(
			results.map((sequence) =>
				getEmojiSequenceString(sequence, {
					separator: ' ',
					case: 'upper',
					format: 'utf-32',
					add0: true,
				})
			)
		).toEqual([
			// emoji without variation in test file
			'1F601',
			'1F635 200D 1F4AB',
			// emojis without variations in test file, but variations in source
			'1F60D',
			// emoji that has variation in test file
			'263A FE0F',
			// keycap
			'0030 FE0F 20E3',
			'0034 FE0F 20E3',
			// complex emoji, exists in file
			'1F9D1 1F3FE 200D 2764 FE0F 200D 1F9D1 1F3FB',
			// simple emoji, not in test file
			'1234 FE0F',
			// fake keycap, not in test file
			'2345 FE0F 20E3 200D 1235 FE0F',
		]);
	});
});