import test from "ava";
import * as Y from "yjs";
import { newHocuspocus, newHocuspocusProvider } from "../utils/index.ts";

const sleep = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));

test("executes the onLoadDocument callback", async (t) => {
	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			async onLoadDocument() {
				t.pass();
				resolve("done");
			},
		});

		newHocuspocusProvider(t, server);
	});
});

test("executes the onLoadDocument callback from an extension", async (t) => {
	await new Promise(async (resolve) => {
		class CustomExtension {
			async onLoadDocument() {
				t.pass();
				resolve("done");
			}
		}

		const server = await newHocuspocus(t, {
			extensions: [new CustomExtension()],
		});

		newHocuspocusProvider(t, server);
	});
});

test("passes the context and connection to the onLoadDocument callback", async (t) => {
	await new Promise(async (resolve) => {
		const mockContext = {
			user: 123,
		};

		const server = await newHocuspocus(t, {
			async onConnect({ connectionConfig }) {
				connectionConfig.readOnly = true;
				return mockContext;
			},
			async onLoadDocument({ context, connectionConfig }) {
				t.deepEqual(context, mockContext);
				t.deepEqual(connectionConfig, {
					readOnly: true,
					isAuthenticated: true,
				});

				resolve("done");
			},
		});

		newHocuspocusProvider(t, server);
	});
});

test("sets the provider to readOnly", async (t) => {
	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			async onLoadDocument({ connectionConfig }) {
				connectionConfig.readOnly = true;
			},
		});

		newHocuspocusProvider(t, server, {
			onSynced() {
				for (const connection of server.documents.get("hocuspocus-test")?.connections.keys() ?? []) {
					t.is(connection.readOnly, true);
				}
				resolve("done");
			},
		});
	});
});

test("creates a new document in the onLoadDocument callback", async (t) => {
	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			onLoadDocument({ document }) {
				// delay more accurately simulates a database fetch
				return new Promise(async (resolve) => {
					setTimeout(() => {
						document.getArray("foo").insert(0, ["bar"]);
						resolve(document);
					}, 200);
				});
			},
		});

		const provider = newHocuspocusProvider(t, server, {
			onSynced() {
				const value = provider.document.getArray("foo").get(0);
				t.is(value, "bar");

				resolve("done");
			},
		});
	});
});

test("does not apply the document to itself when onLoadDocument returns it", async (t) => {
	const origins: unknown[] = [];

	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			async onLoadDocument({ document }) {
				document.on("afterTransaction", (transaction) => {
					origins.push(transaction.origin);
				});

				// the content this hook "loaded", written with an explicit origin so
				// it doubles as a control: without it, a listener that never fires
				// would satisfy the assertion below vacuously
				document.transact(() => {
					document.getArray("foo").insert(0, ["bar"]);
				}, "loaded");

				return document;
			},
		});

		newHocuspocusProvider(t, server, {
			onSynced() {
				resolve("done");
			},
		});
	});

	t.true(origins.includes("loaded"), "the afterTransaction listener never fired");

	// the self-apply calls applyUpdate() without an origin, and the client sync
	// carries a ConnectionTransactionOrigin, so a null origin can only be the
	// document having been applied to itself
	const selfApplies = origins.filter((origin) => origin == null);

	t.is(
		selfApplies.length,
		0,
		`expected no null-origin transaction after onLoadDocument returned the same document, got ${selfApplies.length}`,
	);
});

test("applies a document returned by the onLoadDocument callback", async (t) => {
	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			async onLoadDocument() {
				const loaded = new Y.Doc();
				loaded.getArray("foo").insert(0, ["bar"]);

				return loaded;
			},
		});

		const provider = newHocuspocusProvider(t, server, {
			onSynced() {
				t.is(provider.document.getArray("foo").get(0), "bar");

				resolve("done");
			},
		});
	});
});

test("multiple simultaneous connections do not create multiple documents", async (t) => {
	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			onLoadDocument({ document }) {
				// delay more accurately simulates a database fetch
				return new Promise(async (resolve) => {
					setTimeout(() => {
						document.getArray("foo").insert(0, ["bar"]);
						resolve(document);
					}, 200);
				});
			},
		});

		const provider = newHocuspocusProvider(t, server);

		newHocuspocusProvider(t, server);

		provider.on("synced", () => {
			t.is(server.documents.size, 1);

			resolve("done");
		});
	});
});

test("multiple simultaneous connections wait for the document to be loaded", async (t) => {
	t.plan(6);

	await new Promise(async (resolve) => {
		let resolveOnLoadDocument: () => void = () => {};

		const server = await newHocuspocus(t, {
			onLoadDocument({ document }) {
				// delay more accurately simulates a database fetch
				return new Promise(async (innerResolve) => {
					resolveOnLoadDocument = () => {
						document.getArray("foo").insert(0, ["bar"]);
						innerResolve(document);
					};
				});
			},
		});

		const provider1 = newHocuspocusProvider(t, server);
		const provider2 = newHocuspocusProvider(t, server);
		let provider1Synced = false;
		let provider2Synced = false;

		provider1.on("synced", () => {
			provider1Synced = true;
			const value = provider1.document.getArray("foo").get(0);
			t.is(value, "bar");
		});
		provider2.on("synced", () => {
			provider2Synced = true;
			const value = provider2.document.getArray("foo").get(0);
			t.is(value, "bar");
		});

		await sleep(200);

		t.false(provider1Synced, "provider1Synced");
		t.false(provider2Synced, "provider2Synced");

		resolveOnLoadDocument();

		await sleep(200);

		t.true(provider1Synced, "provider1Synced");
		t.true(provider2Synced, "provider2Synced");

		resolve("done");
	});
});

test("has the server instance", async (t) => {
	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			async onLoadDocument({ instance }) {
				t.is(instance, server);

				resolve("done");
			},
		});

		newHocuspocusProvider(t, server);
	});
});

/**
 * When onLoadDocument fails (for whatever reason), the connection attempt will fail.
 */
test("stops when an error is thrown in onLoadDocument", async (t) => {
	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			async onLoadDocument() {
				throw new Error();
			},
		});

		newHocuspocusProvider(t, server, {
			onAuthenticationFailed() {
				t.pass();
				resolve("done");
			},
		});
	});
});

test("stops when an error is thrown in onLoadDocument, even when authenticated", async (t) => {
	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			async onAuthenticate() {
				return true;
			},
			async onLoadDocument() {
				throw new Error();
			},
		});

		newHocuspocusProvider(t, server, {
			token: "super-secret-token",
			onAuthenticationFailed() {
				t.pass();
				resolve("done");
			},
			onClose() {
				t.fail();
			},
		});
	});
});

test("disconnects all clients related to the document when an error is thrown in onLoadDocument", async (t) => {
	const resolvesNeeded = 2;

	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			async onLoadDocument() {
				return new Promise((resolve, fail) => {
					setTimeout(() => {
						// eslint-disable-next-line prefer-promise-reject-errors
						fail("ERROR");
					}, 250);
				});
			},
			async onStoreDocument(data) {
				t.fail("MUST NOT call onStoreDocument");
			},
		});

		let resolvedNumber = 0;
		const resolver = () => {
			resolvedNumber += 1;

			if (resolvedNumber >= resolvesNeeded) {
				t.is(server.documents.size, 0);
				t.is(server.getConnectionsCount(), 0);
				resolve("done");
			}
		};

		const provider1 = newHocuspocusProvider(t, server, {
			onAuthenticationFailed(event) {
				provider1.disconnect();
				resolver();
			},
		});

		const provider2 = newHocuspocusProvider(t, server, {
			onAuthenticationFailed() {
				provider2.disconnect();
				resolver();
			},
		});
	});
});

test("destroys the document when onLoadDocument throws", async (t) => {
	let loadedDocument: Y.Doc | undefined;

	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			async onLoadDocument({ document }) {
				loadedDocument = document;

				throw new Error("Something went wrong");
			},
		});

		newHocuspocusProvider(t, server, {
			onAuthenticationFailed() {
				resolve("done");
			},
		});
	});

	t.truthy(loadedDocument, "onLoadDocument never ran");

	// Awareness starts a setInterval in its constructor that is only cleared by
	// the document's destroy(), so a document that is never destroyed leaves a
	// live timer behind for every failed load
	t.true(
		loadedDocument?.isDestroyed,
		"the document created for the failed load was never destroyed",
	);
});

test("if a new connection connects while the previous connection still fetches the document, it will just work properly", async (t) => {
	t.plan(11);

	let callsToOnLoadDocument = 0;
	const resolvesNeeded = 10;

	await new Promise(async (resolve) => {
		let resolvedNumber = 0;
		const resolver = () => {
			resolvedNumber += 1;

			if (resolvedNumber >= resolvesNeeded) {
				t.is(callsToOnLoadDocument, 1);
				resolve("done");
			}
		};

		const server = await newHocuspocus(t, {
			// This test asserts on the document state at each individual inbound
			// message, so it pins the unbatched fan-out. With the default
			// `flushDelay: 0` a broadcast lands one event loop turn later, which
			// reorders it relative to the sync acks and shifts these indices.
			flushDelay: false,
			onLoadDocument({ document }) {
				return new Promise(async (resolve) => {
					setTimeout(() => {
						callsToOnLoadDocument += 1;
						document
							.getArray("foo")
							.insert(0, [`bar-${callsToOnLoadDocument}`]);
						resolve(document);
					}, 5000);
				});
			},
		});

		let provider1MessagesReceived = 0;
		const provider = newHocuspocusProvider(t, server, {
			onSynced({ state }) {
				// if (!state) return
				t.is(server.documents.size, 1);

				const value = provider.document.getArray("foo").get(0);
				t.is(value, "bar-1");

				setTimeout(() => {
					provider.document
						.getArray("foo")
						.insert(0, ["bar-updatedAfterProvider1Synced"]);
				}, 100);

				resolver();
			},
			onMessage() {
				if (!provider.isSynced) return;
				provider1MessagesReceived += 1;

				const value = provider.document.getArray("foo").get(0);

				if (provider1MessagesReceived === 1) {
					// do nothing, this is just the ACK for the sync
				} else if (provider1MessagesReceived === 2) {
					// do nothing, this is just the ACK for the received update (set "bar-updatedAfterProvider1Synced")
				} else if (provider1MessagesReceived === 3) {
					t.is(value, "bar-updatedAfterProvider1Synced");
				} else {
					t.is(value, "bar-updatedAfterProvider2ReceivedMessageFrom1");
				}

				resolver();
			},
		});

		let provider2MessagesReceived = 0;
		setTimeout(() => {
			const provider2 = newHocuspocusProvider(t, server, {
				onSynced({ state }) {
					// if (!state) return

					t.is(server.documents.size, 1);

					const value = provider2.document.getArray("foo").get(0);
					t.is(value, "bar-1");

					resolver();
				},
				onMessage(data) {
					if (!provider2.isSynced) return;
					provider2MessagesReceived += 1;

					setTimeout(() => {
						const value = provider2.document.getArray("foo").get(0);

						if (provider2MessagesReceived === 1) {
							// initial state is now synced
							t.is(value, "bar-1");
						} else if (provider2MessagesReceived === 2) {
							t.is(value, "bar-updatedAfterProvider1Synced");
							setTimeout(() => {
								provider.document
									.getArray("foo")
									.insert(0, ["bar-updatedAfterProvider2ReceivedMessageFrom1"]);
							}, 100);
						} else {
							t.is(value, "bar-updatedAfterProvider2ReceivedMessageFrom1");
						}
						resolver();
					});
				},
			});
		}, 2000);
	});
});

test("stops when an error is thrown in onLoadDocument and passed on to the provider", async (t) => {
	class CustomError extends Error {
		code = 1234;
		reason = "mycustomreason";

		constructor(documentName: string) {
			super(`Failed loading ${documentName}`);
		}
	}

	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			async onLoadDocument() {
				throw new CustomError("testdoc");
			},
		});

		newHocuspocusProvider(t, server, {
			onAuthenticationFailed(e) {
				t.is(e.reason, "mycustomreason");
				t.pass();
				resolve("done");
			},
		});
	});
});