import {
	beforeAll,
	afterAll,
	afterEach,
	beforeEach,
	describe,
	expect,
	it,
	test,
} from 'vitest';
import {
	tmpdir
} from 'os';
import {
	mkdtemp,
	rm,
	writeFile,
} from 'fs/promises';
import {
	join
} from 'path';
import {
	application,
	DataSource,
	dataSources,
	encodings,
	Resource,
	resource,
	serializers,
	validation as v,
} from '../../src';
import {request, Server} from 'http';
import {constants} from 'http2';

const PORT = 3000;
const HOST = 'localhost';
const ACCEPT_ENCODING = 'utf-8';
const ACCEPT = 'application/json';

const autoIncrement = async (dataSource: DataSource) => {
	const data = await dataSource.getMultiple() as Record<string, string>[];

	const highestId = data.reduce<number>(
		(highestId, d) => (Number(d.id) > highestId ? Number(d.id) : highestId),
		-Infinity
	);

	if (Number.isFinite(highestId)) {
		return (highestId + 1);
	}

	return 1;
};

describe('yasumi', () => {
	let baseDir: string;
	beforeAll(async () => {
		try {
			baseDir = await mkdtemp(join(tmpdir(), 'yasumi-'));
		} catch {
			// noop
		}
	});
	afterAll(async () => {
		try {
			await rm(baseDir, {
				recursive: true,
			});
		} catch {
			// noop
		}
	});

	let Piano: Resource;
	beforeEach(() => {
		Piano = resource(v.object(
			{
				brand: v.string()
			},
			v.never()
		))
			.name('Piano')
			.id('id' as const, {
				generationStrategy: autoIncrement,
				serialize: (id) => id?.toString() ?? '0',
				deserialize: (id) => Number.isFinite(Number(id)) ? Number(id) : 0,
				schema: v.number(),
			})
	});

	let server: Server;
	beforeEach(() => {
		const app = application({
			name: 'piano-service',
			dataSource: (resource) => new dataSources.jsonlFile.DataSource(resource, baseDir),
		})
			.contentType(ACCEPT, serializers.applicationJson)
			.encoding(ACCEPT_ENCODING, encodings.utf8)
			.resource(Piano);

		const backend = app
			.createBackend()
			.throws404OnDeletingNotFound();

		server = backend.createServer({
			baseUrl: '/api'
		});

		return new Promise((resolve, reject) => {
			server.on('error', (err) => {
				reject(err);
			});

			server.on('listening', () => {
				resolve();
			});

			server.listen({
				port: PORT
			});
		});
	});

	afterEach(() => new Promise((resolve, reject) => {
		server.close((err) => {
			if (err) {
				reject(err);
			}

			resolve();
		});
	}));

	describe('serving collections', () => {
		beforeEach(() => {
			Piano.canFetchCollection();
		});

		afterEach(() => {
			Piano.canFetchCollection(false);
		});

		it('returns data', () => {
			return new Promise<void>((resolve, reject) => {
				const req = request(
					{
						host: HOST,
						port: PORT,
						path: '/api/pianos',
						method: 'GET',
						headers: {
							'Accept': ACCEPT,
							'Accept-Encoding': ACCEPT_ENCODING,
						},
					},
					(res) => {
						res.on('error', (err) => {
							reject(err);
						});

						expect(res).toHaveProperty('statusCode', constants.HTTP_STATUS_OK);
						expect(res.headers).toHaveProperty('content-type', ACCEPT);

						let resBuffer = Buffer.from('');
						res.on('data', (c) => {
							resBuffer = Buffer.concat([resBuffer, c]);
						});

						res.on('close', () => {
							const resBufferJson = resBuffer.toString(ACCEPT_ENCODING);
							const resData = JSON.parse(resBufferJson);
							expect(resData).toEqual([]);
							resolve();
						});
					},
				);

				req.on('error', (err) => {
					reject(err);
				});

				req.end();
			});
		});
	});

	describe('serving items', () => {
		const data = {
			id: 1,
			brand: 'Yamaha'
		};

		beforeEach(async () => {
			const resourcePath = join(baseDir, 'pianos.jsonl');
			await writeFile(resourcePath, JSON.stringify(data));
		});

		beforeEach(() => {
			Piano.canFetchItem();
		});

		afterEach(() => {
			Piano.canFetchItem(false);
		});

		it('returns data', () => {
			return new Promise<void>((resolve, reject) => {
				// TODO all responses should have serialized ids
				const req = request(
					{
						host: HOST,
						port: PORT,
						path: '/api/pianos/1',
						method: 'GET',
						headers: {
							'Accept': ACCEPT,
							'Accept-Encoding': ACCEPT_ENCODING,
						},
					},
					(res) => {
						res.on('error', (err) => {
							reject(err);
						});

						expect(res).toHaveProperty('statusCode', constants.HTTP_STATUS_OK);
						expect(res.headers).toHaveProperty('content-type', ACCEPT);

						let resBuffer = Buffer.from('');
						res.on('data', (c) => {
							resBuffer = Buffer.concat([resBuffer, c]);
						});

						res.on('close', () => {
							const resBufferJson = resBuffer.toString(ACCEPT_ENCODING);
							const resData = JSON.parse(resBufferJson);
							expect(resData).toEqual(data);
							resolve();
						});
					},
				);

				req.on('error', (err) => {
					reject(err);
				});

				req.end();
			});
		});

		it('throws on item not found', () => {
			return new Promise<void>((resolve, reject) => {
				const req = request(
					{
						host: HOST,
						port: PORT,
						path: '/api/pianos/2',
						method: 'GET',
						headers: {
							'Accept': ACCEPT,
							'Accept-Encoding': ACCEPT_ENCODING,
						},
					},
					(res) => {
						res.on('error', (err) => {
							Piano.canFetchItem(false);
							reject(err);
						});

						expect(res).toHaveProperty('statusCode', constants.HTTP_STATUS_NOT_FOUND);
						resolve();
					},
				);

				req.on('error', (err) => {
					reject(err);
				});

				req.end();
			});
		});
	});

	describe('creating items', () => {
		const data = {
			id: 1,
			brand: 'Yamaha'
		};

		const newData = {
			brand: 'K. Kawai'
		};

		beforeEach(async () => {
			const resourcePath = join(baseDir, 'pianos.jsonl');
			await writeFile(resourcePath, JSON.stringify(data));
		});

		beforeEach(() => {
			Piano.canCreate();
		});

		afterEach(() => {
			Piano.canCreate(false);
		});

		it('returns data', () => {
			return new Promise<void>((resolve, reject) => {
				const req = request(
					{
						host: HOST,
						port: PORT,
						path: '/api/pianos',
						method: 'POST',
						headers: {
							'Accept': ACCEPT,
							'Accept-Encoding': ACCEPT_ENCODING,
							'Content-Type': ACCEPT,
						},
					},
					(res) => {
						res.on('error', (err) => {
							reject(err);
						});

						expect(res).toHaveProperty('statusCode', constants.HTTP_STATUS_CREATED);
						expect(res.headers).toHaveProperty('content-type', ACCEPT);

						let resBuffer = Buffer.from('');
						res.on('data', (c) => {
							resBuffer = Buffer.concat([resBuffer, c]);
						});

						res.on('close', () => {
							const resBufferJson = resBuffer.toString(ACCEPT_ENCODING);
							const resData = JSON.parse(resBufferJson);
							expect(resData).toEqual({
								...newData,
								id: 2
							});

							resolve();
						});
					},
				);

				req.on('error', (err) => {
					reject(err);
				});

				req.write(JSON.stringify(newData));
				req.end();
			});
		});
	});

	describe('patching items', () => {
		const data = {
			id: 1,
			brand: 'Yamaha'
		};

		const newData = {
			brand: 'K. Kawai'
		};

		beforeEach(async () => {
			const resourcePath = join(baseDir, 'pianos.jsonl');
			await writeFile(resourcePath, JSON.stringify(data));
		});

		beforeEach(() => {
			Piano.canPatch();
		});

		afterEach(() => {
			Piano.canPatch(false);
		});

		it('returns data', () => {
			return new Promise<void>((resolve, reject) => {
				const req = request(
					{
						host: HOST,
						port: PORT,
						path: `/api/pianos/${data.id}`,
						method: 'PATCH',
						headers: {
							'Accept': ACCEPT,
							'Accept-Encoding': ACCEPT_ENCODING,
							'Content-Type': ACCEPT,
						},
					},
					(res) => {
						res.on('error', (err) => {
							reject(err);
						});

						expect(res).toHaveProperty('statusCode', constants.HTTP_STATUS_OK);
						expect(res.headers).toHaveProperty('content-type', ACCEPT);

						let resBuffer = Buffer.from('');
						res.on('data', (c) => {
							resBuffer = Buffer.concat([resBuffer, c]);
						});

						res.on('close', () => {
							const resBufferJson = resBuffer.toString(ACCEPT_ENCODING);
							const resData = JSON.parse(resBufferJson);
							expect(resData).toEqual({
								...data,
								...newData,
							});
							resolve();
						});
					},
				);

				req.on('error', (err) => {
					reject(err);
				});

				req.write(JSON.stringify(newData));
				req.end();
			});
		});

		it('throws on item to patch not found', () => {
			return new Promise<void>((resolve, reject) => {
				const req = request(
					{
						host: HOST,
						port: PORT,
						path: '/api/pianos/2',
						method: 'PATCH',
						headers: {
							'Accept': ACCEPT,
							'Accept-Encoding': ACCEPT_ENCODING,
							'Content-Type': ACCEPT,
						},
					},
					(res) => {
						res.on('error', (err) => {
							reject(err);
						});

						expect(res).toHaveProperty('statusCode', constants.HTTP_STATUS_NOT_FOUND);
						resolve();
					},
				);

				req.on('error', (err) => {
					reject(err);
				});

				req.write(JSON.stringify(newData));
				req.end();
			});
		});
	});

	describe('emplacing items', () => {
		const data = {
			id: 1,
			brand: 'Yamaha'
		};

		const newData = {
			id: 1,
			brand: 'K. Kawai'
		};

		beforeEach(async () => {
			const resourcePath = join(baseDir, 'pianos.jsonl');
			await writeFile(resourcePath, JSON.stringify(data));
		});

		beforeEach(() => {
			Piano.canEmplace();
		});

		afterEach(() => {
			Piano.canEmplace(false);
		});

		it('returns data for replacement', () => {
			return new Promise<void>((resolve, reject) => {
				const req = request(
					{
						host: HOST,
						port: PORT,
						path: `/api/pianos/${newData.id}`,
						method: 'PUT',
						headers: {
							'Accept': ACCEPT,
							'Accept-Encoding': ACCEPT_ENCODING,
							'Content-Type': ACCEPT,
						},
					},
					(res) => {
						res.on('error', (err) => {
							reject(err);
						});

						expect(res).toHaveProperty('statusCode', constants.HTTP_STATUS_OK);
						expect(res.headers).toHaveProperty('content-type', ACCEPT);

						let resBuffer = Buffer.from('');
						res.on('data', (c) => {
							resBuffer = Buffer.concat([resBuffer, c]);
						});

						res.on('close', () => {
							const resBufferJson = resBuffer.toString(ACCEPT_ENCODING);
							const resData = JSON.parse(resBufferJson);
							expect(resData).toEqual(newData);
							resolve();
						});
					},
				);

				req.on('error', (err) => {
					reject(err);
				});

				req.write(JSON.stringify(newData));
				req.end();
			});
		});

		it('returns data for creation', () => {
			return new Promise<void>((resolve, reject) => {
				const id = 2;

				const req = request(
					{
						host: HOST,
						port: PORT,
						path: `/api/pianos/${id}`,
						method: 'PUT',
						headers: {
							'Accept': ACCEPT,
							'Accept-Encoding': ACCEPT_ENCODING,
							'Content-Type': ACCEPT,
						},
					},
					(res) => {
						res.on('error', (err) => {
							reject(err);
						});

						expect(res).toHaveProperty('statusCode', constants.HTTP_STATUS_CREATED);
						expect(res.headers).toHaveProperty('content-type', ACCEPT);

						let resBuffer = Buffer.from('');
						res.on('data', (c) => {
							resBuffer = Buffer.concat([resBuffer, c]);
						});

						res.on('close', () => {
							const resBufferJson = resBuffer.toString(ACCEPT_ENCODING);
							const resData = JSON.parse(resBufferJson);
							expect(resData).toEqual({
								...newData,
								id,
							});
							resolve();
						});
					},
				);

				req.on('error', (err) => {
					reject(err);
				});

				req.write(JSON.stringify({
					...newData,
					id,
				}));
				req.end();
			});
		});
	});

	describe('deleting items', () => {
		const data = {
			id: 1,
			brand: 'Yamaha'
		};

		beforeEach(async () => {
			const resourcePath = join(baseDir, 'pianos.jsonl');
			await writeFile(resourcePath, JSON.stringify(data));
		});

		beforeEach(() => {
			Piano.canDelete();
		});

		afterEach(() => {
			Piano.canDelete(false);
		});

		it('returns data', () => {
			return new Promise<void>((resolve, reject) => {
				const req = request(
					{
						host: HOST,
						port: PORT,
						path: `/api/pianos/${data.id}`,
						method: 'DELETE',
						headers: {
							'Accept': ACCEPT,
							'Accept-Encoding': ACCEPT_ENCODING,
						},
					},
					(res) => {
						res.on('error', (err) => {
							reject(err);
						});

						expect(res).toHaveProperty('statusCode', constants.HTTP_STATUS_NO_CONTENT);
						resolve();
					},
				);

				req.on('error', (err) => {
					reject(err);
				});

				req.end();
			});
		});

		it('throws on item not found', () => {
			return new Promise<void>((resolve, reject) => {
				const req = request(
					{
						host: HOST,
						port: PORT,
						path: '/api/pianos/2',
						method: 'DELETE',
						headers: {
							'Accept': ACCEPT,
							'Accept-Encoding': ACCEPT_ENCODING,
						},
					},
					(res) => {
						res.on('error', (err) => {
							reject(err);
						});

						expect(res).toHaveProperty('statusCode', constants.HTTP_STATUS_NOT_FOUND);
						resolve();
					},
				);

				req.on('error', (err) => {
					reject(err);
				});

				req.end();
			});
		});
	});

	// https://github.com/mayajs/maya/blob/main/test/index.test.ts
	//
	// peak unit test
	describe("Contribute to see a unit test", () => {
		test("should have a unit test", () => {
			expect("Is this a unit test?").not.toEqual("Yes this is a unit test.");
		});
	});
});