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

test("rejects empty document name via direct connection", async (t) => {
	const server = await newHocuspocus(t);

	await t.throwsAsync(() => server.openDirectConnection(""), {
		message: "Document name must not be empty",
	});

	t.is(server.getDocumentsCount(), 0);
});

test("rejects whitespace-only document name via direct connection", async (t) => {
	const server = await newHocuspocus(t);

	await t.throwsAsync(() => server.openDirectConnection("   "), {
		message: "Document name must not be empty",
	});

	t.is(server.getDocumentsCount(), 0);
});

test("direct connection prevents document from being removed from memory", async (t) => {
	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t);

		await server.openDirectConnection("hocuspocus-test");

		const provider = newHocuspocusProvider(t, server, {
			onSynced() {
				provider.configuration.websocketProvider.destroy();
				provider.destroy();

				sleep(server.configuration.debounce + 50).then(() => {
					t.is(server.getDocumentsCount(), 1);
					resolve("done");
				});
			},
		});
	});
});
test("direct connection works even if provider is connected", async (t) => {
	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t);

		const provider = newHocuspocusProvider(t, server, {
			onSynced() {
				provider.document.getMap("config").set("a", "valueFromProvider");
			},
		});

		await sleep(150);

		const directConnection =
			await server.openDirectConnection("hocuspocus-test");
		await directConnection.transact((doc) => {
			t.is("valueFromProvider", String(doc.getMap("config").get("a")));
			doc.getMap("config").set("b", "valueFromServerDirectConnection");
		});

		await sleep(100);
		t.is(
			"valueFromServerDirectConnection",
			String(provider.document.getMap("config").get("b")),
		);

		resolve(1);
		t.pass();
	});
});

test("direct connection can apply yjsUpdate", async (t) => {
	const server = await newHocuspocus(t);
	const expectedContent = "<paragraph>Example Paragraph</paragraph>";
	let resolveProviderSynced!: () => void;
	const providerSynced = new Promise<void>((resolve) => {
		resolveProviderSynced = resolve;
	});
	const provider = newHocuspocusProvider(t, server, {
		onSynced() {
			resolveProviderSynced();
		},
	});

	await providerSynced;
	const fragment = provider.document.getXmlFragment("default");
	t.is(fragment.toJSON(), "");

	let resolveUpdateApplied!: () => void;
	const updateApplied = new Promise<void>((resolve) => {
		resolveUpdateApplied = resolve;
	});
	const observer = () => {
		if (fragment.toJSON() === expectedContent) {
			fragment.unobserveDeep(observer);
			resolveUpdateApplied();
		}
	};
	fragment.observeDeep(observer);

	const directConnection =
		await server.openDirectConnection("hocuspocus-test");
	await directConnection.transact((doc) => {
		Y.applyUpdate(
			doc,
			Y.encodeStateAsUpdate(
				TiptapTransformer.toYdoc({
					type: "doc",
					content: [
						{
							type: "paragraph",
							content: [
								{
									type: "text",
									text: "Example Paragraph",
								},
							],
						},
					],
				}),
			),
		);
	});

	await updateApplied;
	t.is(fragment.toJSON(), expectedContent);
	await directConnection.disconnect();
});

test("direct connection can transact", async (t) => {
	const server = await newHocuspocus(t);

	const direct = await server.openDirectConnection("hocuspocus-test");

	await direct.transact((document) => {
		document.getArray("test").insert(0, ["value"]);
	});

	t.is(direct.document?.getArray("test").toJSON()[0], "value");
});

test("direct connection cannot transact once closed", async (t) => {
	const server = await newHocuspocus(t);

	const direct = await server.openDirectConnection("hocuspocus-test");
	await direct.disconnect();

	try {
		await direct.transact((document) => {
			document.getArray("test").insert(0, ["value"]);
		});
		t.fail(
			"DirectConnection should throw an error when transacting on closed connection",
		);
	} catch (err) {
		if (err instanceof Error && err.message === "direct connection closed") {
			t.pass();
		} else {
			t.fail("unknown error");
		}
	}
});

test("if a direct connection closes, the document should be unloaded if there is no other connection left", async (t) => {
	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t);

		const direct = await server.openDirectConnection("hocuspocus-test1");
		t.is(server.getDocumentsCount(), 1);
		t.is(server.getConnectionsCount(), 1);

		await direct.transact((document) => {
			document.getArray("test").insert(0, ["value"]);
		});

		await direct.disconnect();

		t.is(server.getConnectionsCount(), 0);
		t.is(server.getDocumentsCount(), 0);
		resolve("done");
	});
});

test("direct connection transact awaits until onStoreDocument has finished", async (t) => {
	let onStoreDocumentFinished = false;

	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			onStoreDocument: async () => {
				onStoreDocumentFinished = false;
				await sleep(200);
				onStoreDocumentFinished = true;
			},
		});

		const direct = await server.openDirectConnection("hocuspocus-test2");
		t.is(server.getDocumentsCount(), 1);
		t.is(server.getConnectionsCount(), 1);

		t.is(onStoreDocumentFinished, false);
		await direct.transact((document) => {
			document.getArray("test").insert(0, ["value"]);
		});

		await direct.disconnect();
		t.is(onStoreDocumentFinished, true);

		t.is(server.getConnectionsCount(), 0);
		t.is(server.getDocumentsCount(), 0);
		t.is(onStoreDocumentFinished, true);
		resolve("done");
	});
});

test("direct connection transact awaits until onStoreDocument has finished, even if unloadImmediately=false", async (t) => {
	let onStoreDocumentFinished = false;
	let directConnDisconnecting = false;
	let storedAfterDisconnect = false;

	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			unloadImmediately: false,
			onStoreDocument: async () => {
				onStoreDocumentFinished = false;
				await sleep(200);
				onStoreDocumentFinished = true;

				if (directConnDisconnecting) {
					storedAfterDisconnect = true;
				}
			},
			afterUnloadDocument: async (data) => {
				if (!storedAfterDisconnect) {
					t.fail("this shouldnt be called");
				}
			},
		});

		const direct = await server.openDirectConnection("hocuspocus-test");
		t.is(server.getDocumentsCount(), 1);
		t.is(server.getConnectionsCount(), 1);

		t.is(onStoreDocumentFinished, false);
		await direct.transact((document) => {
			document.getArray("test").insert(0, ["value"]);
		});

		const provider = newHocuspocusProvider(t, server);
		provider.document.getMap("aaa").set("bb", "b");
		provider.disconnect();
		provider.configuration.websocketProvider.disconnect();

		await sleep(100);

		directConnDisconnecting = true;
		await direct.disconnect();
		t.is(onStoreDocumentFinished, true);

		t.is(server.getConnectionsCount(), 0);

		t.is(storedAfterDisconnect, true);

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

test("does not unload document if an earlierly started onStoreDocument is still running", async (t) => {
	let onStoreDocumentStarted = 0;
	let onStoreDocumentFinished = 0;

	const server = await newHocuspocus(t, {
		unloadImmediately: false,
		debounce: 100,
		onStoreDocument: async () => {
			onStoreDocumentStarted++;
			if (onStoreDocumentStarted === 1) {
				// Simulate a long running onStoreDocument for the first debounced save
				await sleep(500);
			}
			onStoreDocumentFinished++;
		},
		afterUnloadDocument: async (data) => {},
	});

	// Trigger a change, which will start a debounced onStoreDocument after 100ms
	const provider = newHocuspocusProvider(t, server);
	provider.document.getMap("aaa").set("bb", "b");

	await new Promise(async (resolve) => {
		provider.on("synced", resolve);

		if (!provider.unsyncedChanges) resolve("");
	});

	t.is(server.getDocumentsCount(), 1);
	t.is(server.getConnectionsCount(), 1);

	// Wait for the debounced onStoreDocument to start
	await sleep(110);
	t.is(onStoreDocumentStarted, 1);
	t.is(onStoreDocumentFinished, 0);

	// Open direct connection to prevent document from being unloaded
	const direct = await server.openDirectConnection("hocuspocus-test");
	t.is(server.getDocumentsCount(), 1);
	t.is(server.getConnectionsCount(), 2);

	// Close the websocket client
	provider.disconnect();
	provider.configuration.websocketProvider.disconnect();
	await sleep(50);
	t.is(server.getDocumentsCount(), 1);
	t.is(server.getConnectionsCount(), 1);
	t.is(onStoreDocumentStarted, 1);
	t.is(onStoreDocumentFinished, 0);

	direct.disconnect();
	await sleep(50);
	// Another save must not start before the first one has finished
	t.is(onStoreDocumentStarted, 1);
	t.is(onStoreDocumentFinished, 0);
	// Document must not be unloaded yet, because the first onStoreDocument is still running
	t.is(server.getDocumentsCount(), 1);
	t.is(server.getConnectionsCount(), 0);

	// Wait enough time to be sure the onStoreDocument has finished and ensure that the document was eventually unloaded
	await sleep(500);

	// The second onStoreDocument triggered by direct.disconnect must have started and finished now
	t.is(onStoreDocumentStarted, 2);
	t.is(onStoreDocumentFinished, 2);
	// The document must have been unloaded now as well
	t.is(server.getDocumentsCount(), 0);
});

test("creating a websocket connection after transact but before debounce interval doesnt create different docs", async (t) => {
	let onStoreDocumentFinished = false;
	let disconnected = false;
	let testDone = false;

	await new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			onStoreDocument: async () => {
				onStoreDocumentFinished = false;
				await sleep(200);
				onStoreDocumentFinished = true;
			},
			async afterUnloadDocument(data) {
				if (disconnected && !testDone) {
					t.fail("must not be called");
				}
			},
		});

		const direct = await server.openDirectConnection("hocuspocus-test");
		t.is(server.getDocumentsCount(), 1);
		t.is(server.getConnectionsCount(), 1);

		t.is(onStoreDocumentFinished, false);
		await direct.transact((document) => {
			document.transact(() => {
				document.getArray("test").insert(0, ["value"]);
			}, "testOrigin");
		});

		await direct.disconnect();
		t.is(onStoreDocumentFinished, true);
		disconnected = true;

		t.is(server.getConnectionsCount(), 0);
		t.is(server.getDocumentsCount(), 0);
		t.is(onStoreDocumentFinished, true);

		const provider = newHocuspocusProvider(t, server);

		await sleep(server.configuration.debounce * 2);

		testDone = true;
		resolve("done");
	});
});

test("direct connection passes context", async (t) => {
	return new Promise(async (resolve) => {
		const server = await newHocuspocus(t, {
			async onChange(x) {
				t.is(x.context.x, 123);
				t.pass();
				resolve();
			},
		});

		const direct = await server.openDirectConnection("hocuspocus-test", {
			x: 123,
		});

		await direct.transact((document) => {
			document.getArray("test").insert(0, ["value"]);
		});

		t.is(direct.document?.getArray("test").toJSON()[0], "value");
	});
});

test("disconnect({ unloadImmediately: false }) keeps the document warm and coalesces stores", async (t) => {
	let storeCount = 0;

	const server = await newHocuspocus(t, {
		debounce: 100,
		maxDebounce: 500,
		onStoreDocument: async () => {
			storeCount += 1;
		},
	});

	const first = await server.openDirectConnection("hocuspocus-test");
	await first.transact((document) => {
		document.getArray("test").insert(0, ["a"]);
	});
	await first.disconnect({ unloadImmediately: false });

	// The document stays in memory and nothing is persisted yet.
	t.is(server.getConnectionsCount(), 0);
	t.is(server.getDocumentsCount(), 1);
	t.is(storeCount, 0);

	// A follow-up direct connection reuses the warm document.
	const second = await server.openDirectConnection("hocuspocus-test");
	t.is(server.getDocumentsCount(), 1);
	await second.transact((document) => {
		document.getArray("test").insert(1, ["b"]);
	});
	await second.disconnect({ unloadImmediately: false });

	t.is(server.getDocumentsCount(), 1);
	t.is(storeCount, 0);

	// After the debounce window the store flushes once (coalesced) and the
	// document is unloaded.
	await sleep(server.configuration.maxDebounce + server.configuration.debounce + 100);
	t.is(storeCount, 1);
	t.is(server.getDocumentsCount(), 0);
});

test("disconnect() without options still persists and unloads immediately", async (t) => {
	let storeCount = 0;

	const server = await newHocuspocus(t, {
		onStoreDocument: async () => {
			storeCount += 1;
		},
	});

	const direct = await server.openDirectConnection("hocuspocus-test");
	await direct.transact((document) => {
		document.getArray("test").insert(0, ["value"]);
	});
	await direct.disconnect();

	t.is(storeCount, 1);
	t.is(server.getConnectionsCount(), 0);
	t.is(server.getDocumentsCount(), 0);
});