import { DatabaseSync } from "node:sqlite";
import { describe, expect, it } from "vitest";
import { BACKGROUND_CONTEXT } from "../../src/context/index.ts";
import { sqliteBackend } from "../../src/next/store/backend.ts";
import { refusalOf } from "../../src/next/store/refusal.ts";
import type { StagedWrite } from "../../src/next/store/step.ts";
import { type ChordStore, openStore } from "../../src/next/store/store.ts";
import { DurableObjectSqliteDatabase } from "../../src/sqlite/cloudflare.ts";
import { durableObjectStorage, RUN_CHANGES, runChanges } from "./helpers.ts";

describe("Durable Object SQLite driver", () => {
	it("binds and returns BLOB values as Uint8Array", async () => {
		const database = new DurableObjectSqliteDatabase(durableObjectStorage());
		await database.exec("CREATE TABLE blobs (id INTEGER PRIMARY KEY, data BLOB, n INTEGER)");
		await database.run("INSERT INTO blobs (id, data, n) VALUES (?, ?, ?)", 1, new Uint8Array([1, 2, 3]), 7n);
		expect(await database.get("SELECT data, n FROM blobs WHERE id = ?", 1)).toEqual({
			data: new Uint8Array([1, 2, 3]),
			n: 7,
		});
	});

	it("reports the rows a statement changed, without index writes", async () => {
		const database = new DurableObjectSqliteDatabase(durableObjectStorage());
		expect(await runChanges(database)).toEqual(RUN_CHANGES);
		const inTransaction = await database.transaction((handle) =>
			handle.runCounted("INSERT INTO changes_probe VALUES (?, ?, ?)", "t", "t/1", 1),
		);
		expect(inTransaction).toBe(1);
	});

	it("reads only the cursor's first row for get", async () => {
		const operations: string[] = [];
		const database = new DurableObjectSqliteDatabase(
			durableObjectStorage(new DatabaseSync(":memory:"), (operation) => operations.push(operation)),
		);
		await database.exec("CREATE TABLE items (id INTEGER PRIMARY KEY)");
		await database.run("INSERT INTO items (id) VALUES (1), (2)");
		expect(await database.get("SELECT id FROM items ORDER BY id")).toEqual({ id: 1 });
		expect(operations).toEqual(["next"]);
	});

	it("rejects a bigint binding outside the safe integer range", async () => {
		const database = new DurableObjectSqliteDatabase(durableObjectStorage());
		await database.exec("CREATE TABLE numbers (n INTEGER)");
		await expect(database.run("INSERT INTO numbers (n) VALUES (?)", 9_007_199_254_740_993n)).rejects.toThrow(
			RangeError,
		);
		expect(await database.all("SELECT n FROM numbers")).toEqual([]);
	});

	it("closes after an active transaction settles", async () => {
		const database = new DurableObjectSqliteDatabase(durableObjectStorage());
		await database.exec("CREATE TABLE items (id INTEGER PRIMARY KEY)");
		const order: string[] = [];
		const { promise: gate, resolve } = Promise.withResolvers<void>();
		const transaction = database.transaction(async (handle) => {
			await handle.run("INSERT INTO items (id) VALUES (?)", 1);
			await gate;
			order.push("transaction");
		});
		const closed = database.close().then(() => order.push("close"));
		resolve();
		await Promise.all([transaction, closed]);
		expect(order).toEqual(["transaction", "close"]);
	});

	it("runs an uncontended statement before returning its promise", async () => {
		const sqlite = new DatabaseSync(":memory:");
		const database = new DurableObjectSqliteDatabase(durableObjectStorage(sqlite));
		await database.exec("CREATE TABLE items (id INTEGER PRIMARY KEY)");
		const written = database.run("INSERT INTO items (id) VALUES (?)", 1);
		expect(sqlite.prepare("SELECT id FROM items").all()).toEqual([{ id: 1 }]);
		await written;
	});

	it("rolls back a rejected transaction and rejects its handle afterwards", async () => {
		const database = new DurableObjectSqliteDatabase(durableObjectStorage());
		await database.exec("CREATE TABLE items (id INTEGER PRIMARY KEY)");
		let handle: Parameters<Parameters<DurableObjectSqliteDatabase["transaction"]>[0]>[0] | undefined;
		await expect(
			database.transaction(async (transaction) => {
				handle = transaction;
				await transaction.run("INSERT INTO items (id) VALUES (?)", 1);
				throw new Error("abort");
			}),
		).rejects.toThrow("abort");
		expect(await database.all("SELECT id FROM items")).toEqual([]);
		await expect(handle!.run("INSERT INTO items (id) VALUES (?)", 2)).rejects.toThrow("no longer active");
	});

	it("runs operations from another adapter after a transaction, outside its rollback", async () => {
		const storage = durableObjectStorage();
		const database = new DurableObjectSqliteDatabase(storage);
		const other = new DurableObjectSqliteDatabase(storage);
		await database.exec("CREATE TABLE items (id INTEGER PRIMARY KEY)");
		const { promise: gate, resolve } = Promise.withResolvers<void>();
		const transaction = database.transaction(async (handle) => {
			await handle.run("INSERT INTO items (id) VALUES (?)", 1);
			await gate;
			throw new Error("abort");
		});
		const outside = other.run("INSERT INTO items (id) VALUES (?)", 2);
		const read = other.all("SELECT id FROM items");
		resolve();
		await expect(transaction).rejects.toThrow("abort");
		await outside;
		expect(await read).toEqual([{ id: 2 }]);
		await database.close();
	});

	it("includes direct underlying calls in an active transaction", async () => {
		const sqlite = new DatabaseSync(":memory:");
		const storage = durableObjectStorage(sqlite);
		const database = new DurableObjectSqliteDatabase(storage);
		await database.exec("CREATE TABLE items (id INTEGER PRIMARY KEY)");
		const { promise: opened, resolve: markOpened } = Promise.withResolvers<void>();
		const { promise: gate, resolve } = Promise.withResolvers<void>();
		const transaction = database.transaction(async (handle) => {
			await handle.run("INSERT INTO items (id) VALUES (?)", 1);
			markOpened();
			await gate;
			throw new Error("abort");
		});
		await opened;
		storage.sql.exec("INSERT INTO items (id) VALUES (?)", 2);
		resolve();
		await expect(transaction).rejects.toThrow("abort");
		expect(sqlite.prepare("SELECT id FROM items").all()).toEqual([]);
	});
});

describe("the outcome of a transaction (slice 6b D4)", () => {
	/** The test storage, its `transaction` failing after the closure resolved (a failed commit) when asked. */
	function failingCommit(): { storage: ReturnType<typeof durableObjectStorage>; fail(): void } {
		const storage = durableObjectStorage();
		const transaction = storage.transaction.bind(storage);
		let failing = false;
		return {
			storage: {
				...storage,
				transaction: async (closure) => {
					const result = await transaction(closure);
					if (!failing) return result;
					failing = false;
					throw new Error("commit failed");
				},
			},
			fail: () => {
				failing = true;
			},
		};
	}

	it("rejects with the callback's own error after a rollback, another one when the commit fails", async () => {
		const { storage, fail } = failingCommit();
		const database = new DurableObjectSqliteDatabase(storage);
		const own = new Error("refused");
		await expect(database.transaction(async () => Promise.reject(own))).rejects.toBe(own);
		fail();
		await expect(database.transaction(async () => 1)).rejects.toThrow("commit failed");
	});

	it("a store on it tells a CHECK refusal by its message, its error having no extended code", async () => {
		const storage = durableObjectStorage();
		const exec = storage.sql.exec.bind(storage.sql);
		// The Durable Object binding's errors carry a message only.
		const withoutCodes: typeof storage = {
			...storage,
			sql: {
				exec: (query, ...bindings) => {
					try {
						return exec(query, ...bindings);
					} catch (error) {
						throw new Error((error as Error).message);
					}
				},
			},
		};
		const store = (await openStore(
			sqliteBackend(new DurableObjectSqliteDatabase(withoutCodes)),
			BACKGROUND_CONTEXT,
		)) as ChordStore;
		await store.read(
			(executor) => executor.exec('CREATE TABLE "checked" (n INTEGER CHECK (n < 10))'),
			BACKGROUND_CONTEXT,
		);
		const refused: StagedWrite = {
			order: "write",
			apply: async (step) => {
				await step.run('INSERT INTO "checked" VALUES (11)');
				return [];
			},
		};
		const fence = { admit: () => true, adopt: () => {} };
		const error = await store.commit([refused], fence, BACKGROUND_CONTEXT).catch((thrown: unknown) => thrown);
		expect(refusalOf(error, "x")).toMatchObject({ kind: "check" });
		expect(await store.read(async () => 1, BACKGROUND_CONTEXT)).toBe(1);
	});
});