import { describe, expect, mock, test } from "bun:test";
import { KeePassDatabase, openKeePassDatabase } from "../../src/keepass";

const spawnMock = mock(() => {
	throw new Error("spawn should be mocked per test");
});

mock.module("node:child_process", () => ({
	spawn: spawnMock,
}));

function mockSuccessfulBridgeResponse(data: unknown) {
	spawnMock.mockImplementation(() => {
		const child = {
			stdin: { write: () => undefined, end: () => undefined },
			stdout: { on: (_event: string, cb: (chunk: Buffer | string) => void) => cb(JSON.stringify({ ok: true, data })) },
			stderr: { on: () => undefined },
			on: (event: string, cb: (code?: number | null) => void) => {
				if (event === "close") queueMicrotask(() => cb(0));
			},
		};
		return child as never;
	});
}

describe("KeePassDatabase", () => {
	test("listEntries parses successful bridge response", async () => {
		mockSuccessfulBridgeResponse([{ title: "Entry" }]);

		const db = new KeePassDatabase("db.kdbx", { password: "secret" }, "python3", new URL("file:///tmp/bridge.py"));
		const entries = await db.listEntries();

		expect(entries).toEqual([{ title: "Entry" }]);
		expect(spawnMock).toHaveBeenCalled();
	});

	test("throws on bridge error payload", async () => {
		spawnMock.mockImplementation(() => {
			const child = {
				stdin: { write: () => undefined, end: () => undefined },
				stdout: { on: (_event: string, cb: (chunk: Buffer | string) => void) => cb('{"ok":false,"error":"boom"}') },
				stderr: { on: () => undefined },
				on: (event: string, cb: (code?: number | null) => void) => {
					if (event === "close") queueMicrotask(() => cb(1));
				},
			};
			return child as never;
		});

		const db = new KeePassDatabase("db.kdbx", { password: "secret" }, "python3", new URL("file:///tmp/bridge.py"));
		await expect(db.listEntries()).rejects.toThrow("boom");
	});

	test("throws on empty bridge output", async () => {
		spawnMock.mockImplementation(() => {
			const child = {
				stdin: { write: () => undefined, end: () => undefined },
				stdout: { on: (_event: string, cb: (chunk: Buffer | string) => void) => cb("   ") },
				stderr: { on: (_event: string, cb: (chunk: Buffer | string) => void) => cb("bridge failed") },
				on: (event: string, cb: (code?: number | null) => void) => {
					if (event === "close") queueMicrotask(() => cb(1));
				},
			};
			return child as never;
		});

		const db = new KeePassDatabase("db.kdbx", { password: "secret" }, "python3", new URL("file:///tmp/bridge.py"));
		await expect(db.listEntries()).rejects.toThrow("bridge failed");
	});

	test("throws on invalid JSON output", async () => {
		spawnMock.mockImplementation(() => {
			const child = {
				stdin: { write: () => undefined, end: () => undefined },
				stdout: { on: (_event: string, cb: (chunk: Buffer | string) => void) => cb("not json") },
				stderr: { on: () => undefined },
				on: (event: string, cb: (code?: number | null) => void) => {
					if (event === "close") queueMicrotask(() => cb(0));
				},
			};
			return child as never;
		});

		const db = new KeePassDatabase("db.kdbx", { password: "secret" }, "python3", new URL("file:///tmp/bridge.py"));
		await expect(db.listEntries()).rejects.toThrow("Invalid JSON from Python bridge");
	});

	test("throws on spawn error", async () => {
		spawnMock.mockImplementation(() => {
			const child = {
				stdin: { write: () => undefined, end: () => undefined },
				stdout: { on: () => undefined },
				stderr: { on: () => undefined },
				on: (event: string, cb: (error: Error) => void) => {
					if (event === "error") queueMicrotask(() => cb(new Error("spawn failed")));
				},
			};
			return child as never;
		});

		const db = new KeePassDatabase("db.kdbx", { password: "secret" }, "python3", new URL("file:///tmp/bridge.py"));
		await expect(db.listEntries()).rejects.toThrow("spawn failed");
	});

	test("createEntry forwards the create-entry command", async () => {
		mockSuccessfulBridgeResponse({ title: "New" });

		const db = new KeePassDatabase("db.kdbx", { password: "secret" }, "python3", new URL("file:///tmp/bridge.py"));
		const created = await db.createEntry({ title: "New" });

		expect(created).toEqual({ title: "New" });
		expect(spawnMock).toHaveBeenCalled();
	});

	test("createGroup forwards the create-group command", async () => {
		mockSuccessfulBridgeResponse({ name: "Folder", path: "" });

		const db = new KeePassDatabase("db.kdbx", { password: "secret" }, "python3", new URL("file:///tmp/bridge.py"));
		const created = await db.createGroup({ name: "Folder" });

		expect(created).toEqual({ name: "Folder", path: "" });
		expect(spawnMock).toHaveBeenCalled();
	});

	test("save forwards the save command", async () => {
		mockSuccessfulBridgeResponse(null);

		const db = new KeePassDatabase("db.kdbx", { password: "secret" }, "python3", new URL("file:///tmp/bridge.py"));
		await expect(db.save()).resolves.toBeUndefined();
		expect(spawnMock).toHaveBeenCalled();
	});

	test("findEntries forwards the query payload", async () => {
		let payload = "";
		spawnMock.mockImplementation(() => {
			const child = {
				stdin: {
					write: (chunk: string) => {
						payload += chunk;
					},
					end: () => undefined,
				},
				stdout: { on: (_event: string, cb: (chunk: Buffer | string) => void) => cb(JSON.stringify({ ok: true, data: [] })) },
				stderr: { on: () => undefined },
				on: (event: string, cb: (code?: number | null) => void) => {
					if (event === "close") queueMicrotask(() => cb(0));
				},
			};
			return child as never;
		});

		const db = new KeePassDatabase("db.kdbx", { password: "secret" }, "python3", new URL("file:///tmp/bridge.py"));
		await db.findEntries({ title: "abc", username: "u", url: "https://x", groupPath: "Folder" });

		expect(JSON.parse(payload)).toMatchObject({
			command: "find-entries",
			path: "db.kdbx",
			password: "secret",
			query: { title: "abc", username: "u", url: "https://x", groupPath: "Folder" },
		});
	});

	test("listGroups forwards the list-groups command", async () => {
		let payload = "";
		spawnMock.mockImplementation(() => {
			const child = {
				stdin: {
					write: (chunk: string) => {
						payload += chunk;
					},
					end: () => undefined,
				},
				stdout: { on: (_event: string, cb: (chunk: Buffer | string) => void) => cb(JSON.stringify({ ok: true, data: [] })) },
				stderr: { on: () => undefined },
				on: (event: string, cb: (code?: number | null) => void) => {
					if (event === "close") queueMicrotask(() => cb(0));
				},
			};
			return child as never;
		});

		const db = new KeePassDatabase("db.kdbx", { password: "secret" }, "python3", new URL("file:///tmp/bridge.py"));
		await db.listGroups();

		expect(JSON.parse(payload)).toMatchObject({
			command: "list-groups",
			path: "db.kdbx",
			password: "secret",
		});
	});

	test("passes keyFile in the bridge payload", async () => {
		let payload = "";
		spawnMock.mockImplementation(() => {
			const child = {
				stdin: {
					write: (chunk: string) => {
						payload += chunk;
					},
					end: () => undefined,
				},
				stdout: { on: (_event: string, cb: (chunk: Buffer | string) => void) => cb(JSON.stringify({ ok: true, data: [] })) },
				stderr: { on: () => undefined },
				on: (event: string, cb: (code?: number | null) => void) => {
					if (event === "close") queueMicrotask(() => cb(0));
				},
			};
			return child as never;
		});

		const db = new KeePassDatabase("db.kdbx", { password: "secret", keyFile: "keyfile.key" }, "python3", new URL("file:///tmp/bridge.py"));
		await db.listEntries();

		expect(JSON.parse(payload)).toMatchObject({
			path: "db.kdbx",
			password: "secret",
			keyFile: "keyfile.key",
			command: "list-entries",
		});
	});

	test("openKeePassDatabase returns a KeePassDatabase instance", () => {
		const db = openKeePassDatabase("db.kdbx", { password: "secret" });
		expect(db).toBeInstanceOf(KeePassDatabase);
	});
});