import { expect, test } from 'vitest';
import { Input } from '../../src/input.js';
import { FilePathSource, ReadableStreamSource } from '../../src/source.js';
import path from 'node:path';
import fs from 'node:fs';
import { Readable } from 'node:stream';
import { ALL_FORMATS, MPEG_TS } from '../../src/input-format.js';
import { assert } from '../../src/misc.js';
import { EncodedPacketSink } from '../../src/media-sink.js';
import { EncodedPacket } from '../../src/packet.js';
import { MpegTsTrackBacking } from '../../src/mpeg-ts/mpeg-ts-demuxer.js';

const __dirname = new URL('.', import.meta.url).pathname;

test('MPEG-TS metadata reading', async () => {
	using input = new Input({
		source: new FilePathSource(path.join(__dirname, '../public/0.ts')),
		formats: ALL_FORMATS,
	});

	expect(await input.getFormat()).toBe(MPEG_TS);
	expect((await input.getFormat()).mimeType).toBe('video/MP2T');
	expect(await input.getMimeType()).toBe('video/MP2T; codecs="avc1.640020, mp4a.40.2"');

	const tracks = await input.getTracks();
	expect(tracks).toHaveLength(2);

	const videoTrack = await input.getPrimaryVideoTrack();
	assert(videoTrack);

	expect(videoTrack.id).toBe(0x100);
	expect(videoTrack.codec).toBe('avc');
	expect(videoTrack.internalCodecId).toBe(0x1b);
	expect(videoTrack.displayWidth).toEqual(720);
	expect(videoTrack.displayHeight).toEqual(720);
	expect(videoTrack.timeResolution).toBe(90_000);

	const videoDecoderConfig = await videoTrack.getDecoderConfig();
	expect(videoDecoderConfig).toEqual({
		codec: 'avc1.640020',
		codedWidth: 720,
		codedHeight: 720,
		colorSpace: {
			primaries: 'bt2020',
			transfer: 'hlg',
			matrix: 'bt2020-ncl',
			fullRange: false,
		},
		// No description, it's Annex B
	});

	expect(await videoTrack.getFirstTimestamp()).toBe(10.033333333333333);

	const audioTrack = await input.getPrimaryAudioTrack();
	assert(audioTrack);

	expect(audioTrack.id).toBe(0x101);
	expect(audioTrack.codec).toBe('aac');
	expect(audioTrack.numberOfChannels).toBe(2);
	expect(audioTrack.sampleRate).toBe(48000);

	const audioDecoderConfig = await audioTrack.getDecoderConfig();
	expect(audioDecoderConfig).toEqual({
		codec: 'mp4a.40.2',
		numberOfChannels: 2,
		sampleRate: 48000,
		// No description, it's ADTS audio
	});

	expect(await audioTrack.getFirstTimestamp()).toBe(10.012);
});

test('MPEG-TS durations', async () => {
	using input = new Input({
		source: new FilePathSource(path.join(__dirname, '../public/0.ts')),
		formats: ALL_FORMATS,
	});

	const firstTimestamp = await input.getFirstTimestamp();
	expect(firstTimestamp).toBe(10.012);

	const duration = await input.computeDuration();
	expect(duration).toBeCloseTo(15.004);

	const videoTrack = await input.getPrimaryVideoTrack();
	assert(videoTrack);

	const videoFirstTimestamp = await videoTrack.getFirstTimestamp();
	expect(videoFirstTimestamp).toBe(10.033333333333333);

	const videoDuration = await videoTrack.computeDuration();
	expect(videoDuration).toBeCloseTo(14.983333333333333);

	const audioTrack = await input.getPrimaryAudioTrack();
	assert(audioTrack);

	const audioFirstTimestamp = await audioTrack.getFirstTimestamp();
	expect(audioFirstTimestamp).toBe(10.012);

	const audioDuration = await audioTrack.computeDuration();
	expect(audioDuration).toBeCloseTo(15.004);
});

test('MPEG-TS AVC video packets', async () => {
	using input = new Input({
		source: new FilePathSource(path.join(__dirname, '../public/0.ts')),
		formats: ALL_FORMATS,
	});

	const videoTrack = await input.getPrimaryVideoTrack();
	assert(videoTrack);

	const sink = new EncodedPacketSink(videoTrack);

	const firstPacket = await sink.getFirstPacket();
	assert(firstPacket);

	expect([...firstPacket.data.slice(0, 4)]).toEqual([0, 0, 0, 1]);
	expect(firstPacket.data.byteLength).toBe(23813);
	expect(firstPacket.type).toBe('key');
	expect(firstPacket.timestamp).toBe(10.033333333333333);
	expect(firstPacket.duration).toBe(0);
	expect(firstPacket.sequenceNumber).not.toBe(-1);

	const firstPacketMetadataOnly = await sink.getFirstPacket({ metadataOnly: true });
	assert(firstPacketMetadataOnly);
	expect(firstPacketMetadataOnly.data).toHaveLength(0);
	expect(firstPacketMetadataOnly.byteLength).toBe(23813);

	const secondPacket = await sink.getNextPacket(firstPacket);
	assert(secondPacket);

	expect([...secondPacket.data.slice(0, 4)]).toEqual([0, 0, 0, 1]);
	expect(secondPacket.data.byteLength).toBe(5700);
	expect(secondPacket.type).toBe('delta');
	expect(secondPacket.timestamp).toBe(10.1);
	expect(secondPacket.duration).toBe(0);
	expect(secondPacket.sequenceNumber).toBeGreaterThan(firstPacket.sequenceNumber);

	let currentPacket: EncodedPacket | null = firstPacket;
	let count = 0;

	while (currentPacket) {
		count++;
		currentPacket = await sink.getNextPacket(currentPacket);
	}

	expect(count).toBe(298);
});

test('MPEG-TS AAC audio packets', async () => {
	using input = new Input({
		source: new FilePathSource(path.join(__dirname, '../public/0.ts')),
		formats: ALL_FORMATS,
	});

	const audioTrack = await input.getPrimaryAudioTrack();
	assert(audioTrack);

	const sink = new EncodedPacketSink(audioTrack);

	const firstPacket = await sink.getFirstPacket();
	assert(firstPacket);

	expect(firstPacket.data[0]).toEqual(0xff);
	expect(firstPacket.data.byteLength).toBe(348);
	expect(firstPacket.type).toBe('key');
	expect(firstPacket.timestamp).toBe(10.012);
	expect(firstPacket.duration).toBeCloseTo(0.021333333333333333);
	expect(firstPacket.sequenceNumber).not.toBe(-1);

	const secondPacket = await sink.getNextPacket(firstPacket);
	assert(secondPacket);

	expect(secondPacket.data[0]).toEqual(0xff);
	expect(secondPacket.data.byteLength).toBe(349);
	expect(secondPacket.type).toBe('key');
	expect(secondPacket.timestamp).toBeCloseTo(10.033333333333333);
	expect(secondPacket.duration).toBeCloseTo(0.021333333333333333);
	expect(secondPacket.sequenceNumber).toBeGreaterThan(firstPacket.sequenceNumber);

	let currentPacket: EncodedPacket | null = firstPacket;
	let count = 0;

	while (currentPacket) {
		count++;
		currentPacket = await sink.getNextPacket(currentPacket);
	}

	expect(count).toBe(234);
});

test('MPEG-TS video seeking', async () => {
	using input = new Input({
		source: new FilePathSource(path.join(__dirname, '../public/0.ts')),
		formats: ALL_FORMATS,
	});

	const videoTrack = await input.getPrimaryVideoTrack();
	assert(videoTrack);

	const sink = new EncodedPacketSink(videoTrack);

	const firstTimestamp = await videoTrack.getFirstTimestamp();
	const firstPacket = await sink.getPacket(firstTimestamp);
	assert(firstPacket);
	expect(firstPacket.timestamp).toBe(firstTimestamp);
	expect(firstPacket.sequenceNumber).toBe((await sink.getFirstPacket())?.sequenceNumber);

	const lastPacket = await sink.getPacket(Infinity);
	assert(lastPacket);

	expect(lastPacket.timestamp).toBeCloseTo(14.983333333333333);

	const beforeFirst = await sink.getPacket(-10);
	expect(beforeFirst).toBeNull();

	const middlePacket = await sink.getPacket(12.5);
	assert(middlePacket);
	expect(middlePacket.timestamp).toBeCloseTo(12.5);

	const allPackets: EncodedPacket[] = [];
	let currentPacket: EncodedPacket | null = firstPacket;

	while (currentPacket) {
		allPackets.push(currentPacket);
		currentPacket = await sink.getNextPacket(currentPacket);
	}

	expect(allPackets).toHaveLength(298);

	for (const packet of allPackets) {
		const seekedPacked = await sink.getPacket(packet.timestamp);
		assert(seekedPacked);
		expect(seekedPacked.timestamp).toBe(packet.timestamp); // The correct timestamp was retrieved for this packet
		expect(seekedPacked.sequenceNumber).toBe(packet.sequenceNumber);
	}
});

test('MPEG-TS audio seeking', async () => {
	using input = new Input({
		source: new FilePathSource(path.join(__dirname, '../public/0.ts')),
		formats: ALL_FORMATS,
	});

	const audioTrack = await input.getPrimaryAudioTrack();
	assert(audioTrack);

	const sink = new EncodedPacketSink(audioTrack);

	const firstTimestamp = await audioTrack.getFirstTimestamp();
	const firstPacket = await sink.getPacket(firstTimestamp);
	assert(firstPacket);
	expect(firstPacket.timestamp).toBe(firstTimestamp);
	expect(firstPacket.sequenceNumber).toBe((await sink.getFirstPacket())?.sequenceNumber);

	const lastPacket = await sink.getPacket(Infinity);
	assert(lastPacket);

	expect(lastPacket.timestamp).toBeCloseTo(14.982666666666667);

	const beforeFirst = await sink.getPacket(-10);
	expect(beforeFirst).toBeNull();

	const middlePacket = await sink.getPacket(12.5);
	assert(middlePacket);
	expect(middlePacket.timestamp).toBeCloseTo(12.486666666666666);

	const allPackets: EncodedPacket[] = [];
	let currentPacket: EncodedPacket | null = firstPacket;

	while (currentPacket) {
		allPackets.push(currentPacket);
		currentPacket = await sink.getNextPacket(currentPacket);
	}

	expect(allPackets).toHaveLength(234);

	for (const packet of allPackets) {
		const seekedPacket = await sink.getPacket(packet.timestamp);
		assert(seekedPacket);
		expect(seekedPacket.timestamp).toBe(packet.timestamp); // The correct timestamp was retrieved for this packet
		expect(seekedPacket.sequenceNumber).toBe(packet.sequenceNumber);
	}
});

test('MPEG-TS seeking race condition test', async () => {
	using input = new Input({
		source: new FilePathSource(path.join(__dirname, '../public/0.ts')),
		formats: ALL_FORMATS,
	});

	const videoTrack = await input.getPrimaryVideoTrack();
	assert(videoTrack);

	const sink = new EncodedPacketSink(videoTrack);

	const allPackets: EncodedPacket[] = [];
	let currentPacket: EncodedPacket | null = await sink.getFirstPacket();

	while (currentPacket) {
		allPackets.push(currentPacket);
		currentPacket = await sink.getNextPacket(currentPacket);
	}

	// Perform all seeks concurrently
	const seekPromises = allPackets.map(packet => sink.getPacket(packet.timestamp));
	const seekedPackets = await Promise.all(seekPromises);

	for (let i = 0; i < allPackets.length; i++) {
		const originalPacket = allPackets[i]!;
		const seekedPacket = seekedPackets[i]!;
		assert(seekedPacket);
		expect(seekedPacket.timestamp).toBe(originalPacket.timestamp);
		expect(seekedPacket.sequenceNumber).toBe(originalPacket.sequenceNumber);
	}
});

test('MPEG-TS video key packets', async () => {
	using input = new Input({
		source: new FilePathSource(path.join(__dirname, '../public/193039199_mp4_h264_aac_fhd_7.ts')),
		formats: ALL_FORMATS,
	});

	const videoTrack = await input.getPrimaryVideoTrack();
	assert(videoTrack);

	const sink = new EncodedPacketSink(videoTrack);

	const firstPacket = await sink.getFirstPacket();
	assert(firstPacket);
	expect(firstPacket.type).toBe('key');

	const secondPacket = await sink.getNextPacket(firstPacket);
	assert(secondPacket);
	expect(secondPacket.type).toBe('delta');

	const nextKeyPacket = await sink.getNextKeyPacket(firstPacket);
	assert(nextKeyPacket);
	expect(nextKeyPacket.type).toBe('key');
	expect(nextKeyPacket.sequenceNumber).toBeGreaterThan(secondPacket.sequenceNumber);

	const firstKeyPacket = await sink.getKeyPacket(firstPacket.timestamp + 1);
	assert(firstKeyPacket);
	expect(firstKeyPacket.type).toBe('key');
	expect(firstKeyPacket.sequenceNumber).toBe(firstPacket.sequenceNumber);

	const secondKeyPacket = await sink.getKeyPacket(15);
	assert(secondKeyPacket);
	expect(secondKeyPacket.type).toBe('key');
	expect(secondKeyPacket.sequenceNumber).toBe(nextKeyPacket.sequenceNumber);

	const lastKeyPacket = await sink.getKeyPacket(Infinity);
	assert(lastKeyPacket);
	expect(lastKeyPacket.type).toBe('key');
	expect(lastKeyPacket.sequenceNumber).toBe(secondKeyPacket.sequenceNumber); // It's actually the last key packet

	const allKeyPackets: EncodedPacket[] = [];
	let currentKeyPacket: EncodedPacket | null = firstPacket;

	while (currentKeyPacket) {
		allKeyPackets.push(currentKeyPacket);
		currentKeyPacket = await sink.getNextKeyPacket(currentKeyPacket);
	}

	for (const packet of allKeyPackets) {
		const keyPacket = await sink.getKeyPacket(packet.timestamp);
		assert(keyPacket);
		expect(keyPacket.timestamp).toBe(packet.timestamp); // The correct timestamp was retrieved for this packet
		expect(keyPacket.sequenceNumber).toBe(packet.sequenceNumber);
	}
});

test('MPEG-TS audio key packets', async () => {
	using input = new Input({
		source: new FilePathSource(path.join(__dirname, '../public/193039199_mp4_h264_aac_fhd_7.ts')),
		formats: ALL_FORMATS,
	});

	const audioTrack = await input.getPrimaryAudioTrack();
	assert(audioTrack);

	const sink = new EncodedPacketSink(audioTrack);

	const firstPacket = await sink.getFirstPacket();
	assert(firstPacket);
	expect(firstPacket.type).toBe('key');

	const secondPacket = await sink.getNextPacket(firstPacket);
	assert(secondPacket);
	expect(secondPacket.type).toBe('key');

	const nextKeyPacket = await sink.getNextKeyPacket(firstPacket);
	assert(nextKeyPacket);
	expect(nextKeyPacket.type).toBe('key');
	expect(nextKeyPacket.sequenceNumber).toBe(secondPacket.sequenceNumber); // All audio packets are key packets

	const lastPacket = await sink.getPacket(Infinity);
	assert(lastPacket);

	const lastKeyPacket = await sink.getKeyPacket(Infinity);
	assert(lastKeyPacket);
	expect(lastKeyPacket.type).toBe('key');
	expect(lastKeyPacket.sequenceNumber).toBe(lastPacket.sequenceNumber); // It's actually the last packet

	const allKeyPackets: EncodedPacket[] = [];
	let currentKeyPacket: EncodedPacket | null = firstPacket;

	while (currentKeyPacket) {
		allKeyPackets.push(currentKeyPacket);
		currentKeyPacket = await sink.getNextKeyPacket(currentKeyPacket);
	}

	for (const packet of allKeyPackets) {
		const keyPacket = await sink.getKeyPacket(packet.timestamp);
		assert(keyPacket);
		expect(keyPacket.timestamp).toBe(packet.timestamp); // The correct timestamp was retrieved for this packet
		expect(keyPacket.sequenceNumber).toBe(packet.sequenceNumber);
	}
});

test('MPEG-TS with unknown file size (ReadableStreamSource)', async () => {
	const filePath = path.join(__dirname, '../public/0.ts');
	const fileStream = fs.createReadStream(filePath);
	const webStream = Readable.toWeb(fileStream) as ReadableStream<Uint8Array>;

	using input = new Input({
		source: new ReadableStreamSource(webStream),
		formats: ALL_FORMATS,
	});

	const videoTrack = await input.getPrimaryVideoTrack();
	assert(videoTrack);

	const sink = new EncodedPacketSink(videoTrack);

	const firstPacket = await sink.getFirstPacket();
	assert(firstPacket);
	expect(firstPacket.type).toBe('key');
	expect(firstPacket.timestamp).toBe(10.033333333333333);

	const middlePacket = await sink.getPacket(12.5);
	assert(middlePacket);
	expect(middlePacket.timestamp).toBeCloseTo(12.5);

	const duration = await videoTrack.computeDuration();
	expect(duration).toBeCloseTo(14.983333333333333);

	// Ensure that reference points have still been added
	expect((videoTrack._backing as unknown as MpegTsTrackBacking).referencePesPackets.length)
		.toBeGreaterThanOrEqual(10);
});