import { readFile, writeFile, unlink } from 'node:fs/promises';
import { parseEmojiTestFile } from '../lib/emoji/test/parse';
import { emojiVersion } from '../lib/emoji/data';
import {
	createOptimisedRegex,
	createOptimisedRegexForEmojiSequences,
} from '../lib/emoji/regex/create';
import {
	getEmojiMatchesInText,
	sortEmojiMatchesInText,
} from '../lib/emoji/replace/find';
import { getQualifiedEmojiVariations } from '../lib/emoji/test/variations';
import { getEmojiSequenceString } from '../lib/emoji/format';

describe('Finding emojis in text', () => {
	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 (
					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;
	}

	let data: string | undefined;

	beforeAll(async () => {
		data = await fetchEmojiTestData();
	});

	it('Simple regex', () => {
		const regexValue = createOptimisedRegex([
			'1F600',
			'1F603',
			'1F604',
			'263A FE0F',
		]);

		const text1 = 'E1.0 grinning face: ';
		const emoji1 = String.fromCodePoint(0x1f600);
		const text2 = '\nE0.6 grinning face with big eyes: ';
		const emoji2 = String.fromCodePoint(0x1f603);
		const text3 = 'E1.0 grinning face: ';
		const emoji3 = emoji1;
		const text4 = 'E0.6 smiling face: ';
		const emoji4 = '\u263A\uFE0F';
		const text5 = '(fully-qualified)\nE0.6 smiling face: ';
		const emoji5 = '\u263A';
		const text6 = '(unqualified)';

		const content =
			text1 +
			emoji1 +
			text2 +
			emoji2 +
			text3 +
			emoji3 +
			text4 +
			emoji4 +
			text5 +
			emoji5 +
			text6;
		const matches = getEmojiMatchesInText(regexValue, content);

		expect(matches).toEqual([
			{
				match: '\u263A\uFE0F',
				sequence: [0x263a],
				keyword: '263a',
				regexp: 0,
			},
			{
				// Should be returned only once
				match: String.fromCodePoint(0x1f600),
				sequence: [0x1f600],
				keyword: '1f600',
				regexp: 0,
			},
			{
				match: String.fromCodePoint(0x1f603),
				sequence: [0x1f603],
				keyword: '1f603',
				regexp: 0,
			},
			{
				// Same as first, but without 'FE0F'
				match: '\u263A',
				sequence: [0x263a],
				keyword: '263a',
				regexp: 0,
			},
		]);

		const sortedMatches = sortEmojiMatchesInText(content, matches);
		expect(sortedMatches).toEqual([
			// Same order as in content
			{
				match: {
					match: emoji1,
					sequence: [0x1f600],
					keyword: '1f600',
					regexp: 0,
				},
				prev: text1,
				next: text2,
			},
			{
				match: {
					match: emoji2,
					sequence: [0x1f603],
					keyword: '1f603',
					regexp: 0,
				},
				prev: text2,
				next: text3,
			},
			{
				match: {
					match: emoji3,
					sequence: [0x1f600],
					keyword: '1f600',
					regexp: 0,
				},
				prev: text3,
				next: text4,
			},
			{
				match: {
					match: emoji4,
					sequence: [0x263a],
					keyword: '263a',
					regexp: 0,
				},
				prev: text4,
				next: text5,
			},
			{
				match: {
					match: emoji5,
					sequence: [0x263a],
					keyword: '263a',
					regexp: 0,
				},
				prev: text5,
				next: text6,
			},
		]);
	});

	it('Multiple regex', () => {
		const regex0 = createOptimisedRegex(['1F600', '1F603', '1F604']);
		const regex1 = createOptimisedRegex(['263A FE0F']);

		const text1 = 'E1.0 grinning face: ';
		const emoji1 = String.fromCodePoint(0x1f600);
		const text2 = '\nE0.6 grinning face with big eyes: ';
		const emoji2 = String.fromCodePoint(0x1f603);
		const text3 = 'E1.0 grinning face: ';
		const emoji3 = emoji1;
		const text4 = 'E0.6 smiling face: ';
		const emoji4 = '\u263A\uFE0F';
		const text5 = '(fully-qualified)\nE0.6 smiling face: ';
		const emoji5 = '\u263A';
		const text6 = '(unqualified)';

		const content =
			text1 +
			emoji1 +
			text2 +
			emoji2 +
			text3 +
			emoji3 +
			text4 +
			emoji4 +
			text5 +
			emoji5 +
			text6;
		const matches = getEmojiMatchesInText([regex0, regex1], content);

		expect(matches).toEqual([
			{
				match: '\u263A\uFE0F',
				sequence: [0x263a],
				keyword: '263a',
				regexp: 1,
			},
			{
				// Should be returned only once
				match: String.fromCodePoint(0x1f600),
				sequence: [0x1f600],
				keyword: '1f600',
				regexp: 0,
			},
			{
				match: String.fromCodePoint(0x1f603),
				sequence: [0x1f603],
				keyword: '1f603',
				regexp: 0,
			},
			{
				// Same as first, but without 'FE0F'
				match: '\u263A',
				sequence: [0x263a],
				keyword: '263a',
				regexp: 1,
			},
		]);

		const sortedMatches = sortEmojiMatchesInText(content, matches);
		expect(sortedMatches).toEqual([
			// Same order as in content
			{
				match: {
					match: emoji1,
					sequence: [0x1f600],
					keyword: '1f600',
					regexp: 0,
				},
				prev: text1,
				next: text2,
			},
			{
				match: {
					match: emoji2,
					sequence: [0x1f603],
					keyword: '1f603',
					regexp: 0,
				},
				prev: text2,
				next: text3,
			},
			{
				match: {
					match: emoji3,
					sequence: [0x1f600],
					keyword: '1f600',
					regexp: 0,
				},
				prev: text3,
				next: text4,
			},
			{
				match: {
					match: emoji4,
					sequence: [0x263a],
					keyword: '263a',
					regexp: 1,
				},
				prev: text4,
				next: text5,
			},
			{
				match: {
					match: emoji5,
					sequence: [0x263a],
					keyword: '263a',
					regexp: 1,
				},
				prev: text5,
				next: text6,
			},
		]);
	});

	it('Sequences without spaces', () => {
		const regex = createOptimisedRegex(['1F63A', '1F638', '1F639']);

		const emoji1 = String.fromCodePoint(0x1f63a);
		const emoji2 = String.fromCodePoint(0x1f638);
		const emoji3 = String.fromCodePoint(0x1f639);

		const content = emoji1 + emoji2 + emoji3 + emoji1 + emoji2;
		const matches = getEmojiMatchesInText(regex, content);

		expect(matches).toEqual([
			{
				match: '\uD83D\uDE38',
				sequence: [0x1f638],
				keyword: '1f638',
				regexp: 0,
			},
			{
				match: '\uD83D\uDE39',
				sequence: [0x1f639],
				keyword: '1f639',
				regexp: 0,
			},
			{
				match: '\uD83D\uDE3A',
				sequence: [0x1f63a],
				keyword: '1f63a',
				regexp: 0,
			},
		]);

		const sortedMatches = sortEmojiMatchesInText(content, matches);
		expect(sortedMatches).toEqual([
			// Same order as in content
			{
				match: {
					match: '\uD83D\uDE3A',
					sequence: [0x1f63a],
					keyword: '1f63a',
					regexp: 0,
				},
				prev: '',
				next: '',
			},
			{
				match: {
					match: '\uD83D\uDE38',
					sequence: [0x1f638],
					keyword: '1f638',
					regexp: 0,
				},
				prev: '',
				next: '',
			},
			{
				match: {
					match: '\uD83D\uDE39',
					sequence: [0x1f639],
					keyword: '1f639',
					regexp: 0,
				},
				prev: '',
				next: '',
			},
			{
				match: {
					match: '\uD83D\uDE3A',
					sequence: [0x1f63a],
					keyword: '1f63a',
					regexp: 0,
				},
				prev: '',
				next: '',
			},
			{
				match: {
					match: '\uD83D\uDE38',
					sequence: [0x1f638],
					keyword: '1f638',
					regexp: 0,
				},
				prev: '',
				next: '',
			},
		]);
	});

	it('Finding all test emojis', () => {
		if (!data) {
			console.warn('Test skipped: test data is not available');
			return;
		}

		// Parse test data
		const testData = parseEmojiTestFile(data);
		const sequences = Object.values(testData).map(({ sequence }) => {
			return {
				sequence,
			};
		});

		// Get all icons
		const iconsList = getQualifiedEmojiVariations(sequences);

		// Get regex
		const regexValue = createOptimisedRegexForEmojiSequences(
			iconsList.map((item) => item.sequence)
		);
		const regex = new RegExp(regexValue, 'g');

		sequences.forEach((sequence) => {
			const text = sequence.sequence
				.map((code) => String.fromCodePoint(code))
				.join('');

			// Test finding match
			const result = getEmojiMatchesInText(regex, text);

			// Must have only 1 item
			if (result.length !== 1) {
				console.log(
					getEmojiSequenceString(sequence.sequence),
					`(\\u${getEmojiSequenceString(sequence.sequence, {
						format: 'utf-16',
						separator: '\\u',
						case: 'upper',
					})})`,
					text
				);
				result.forEach((match) => {
					const sequence: number[] = [];
					for (const codePoint of match.match) {
						const num = codePoint.codePointAt(0) as number;
						sequence.push(num);
					}
					console.log(
						getEmojiSequenceString(sequence),
						`(\\u${getEmojiSequenceString(sequence, {
							format: 'utf-16',
							separator: '\\u',
							case: 'upper',
						})})`
					);
				});
				console.log(result);
				expect(result.length).toBe(1);
			}

			const firstMatch = result[0];
			const resultSequence = [];
			for (const codePoint of firstMatch.match) {
				const num = codePoint.codePointAt(0) as number;
				resultSequence.push(num);
			}

			if (resultSequence.length !== sequence.sequence.length) {
				console.log(
					getEmojiSequenceString(sequence.sequence),
					`(\\u${getEmojiSequenceString(sequence.sequence, {
						format: 'utf-16',
						separator: '\\u',
						case: 'upper',
					})})`,
					result
				);
			}
			expect(resultSequence).toEqual(sequence.sequence);
		});
	});
});