// lib/config/validateEnv.test.js
import { describe, it, expect } from "vitest";
import { validateEnv, MIN_SESSION_SECRET_LENGTH } from "./validateEnv.js";

function validSecret() {
	return "x".repeat(MIN_SESSION_SECRET_LENGTH);
}

describe("validateEnv", () => {
	it("returns normalized config for a valid env", () => {
		const cfg = validateEnv({
			MONGODB_URI: "mongodb://localhost:27017/rhl",
			SESSION_SECRET: validSecret(),
			NAS_ROOT_PATH: "/mnt/niederlassungen/",
			PORT: "3000",
		});

		expect(cfg.mongodbUri).toBe("mongodb://localhost:27017/rhl");
		expect(cfg.sessionSecret).toBe(validSecret());
		expect(cfg.nasRootPath).toBe("/mnt/niederlassungen");
		expect(cfg.nodeEnv).toBe("development");
		expect(cfg.port).toBe(3000);
	});

	it("accepts optional SESSION_COOKIE_SECURE=false", () => {
		expect(() =>
			validateEnv({
				MONGODB_URI: "mongodb://localhost:27017/rhl",
				SESSION_SECRET: validSecret(),
				NAS_ROOT_PATH: "/mnt/niederlassungen",
				NODE_ENV: "production",
				SESSION_COOKIE_SECURE: "false",
			})
		).not.toThrow();
	});

	it("rejects invalid SESSION_COOKIE_SECURE values", () => {
		expect(() =>
			validateEnv({
				MONGODB_URI: "mongodb://localhost:27017/rhl",
				SESSION_SECRET: validSecret(),
				NAS_ROOT_PATH: "/mnt/niederlassungen",
				SESSION_COOKIE_SECURE: "maybe",
			})
		).toThrow(/SESSION_COOKIE_SECURE/i);
	});

	it("throws with a clear error if required vars are missing", () => {
		try {
			validateEnv({});
			throw new Error("Expected validateEnv to throw");
		} catch (err) {
			expect(err.code).toBe("ENV_INVALID");
			expect(err.missing).toEqual([
				"MONGODB_URI",
				"SESSION_SECRET",
				"NAS_ROOT_PATH",
			]);
			expect(String(err.message)).toContain(
				"Missing required environment variables:"
			);
		}
	});

	it("rejects invalid MONGODB_URI schemes", () => {
		expect(() =>
			validateEnv({
				MONGODB_URI: "http://localhost:27017/rhl",
				SESSION_SECRET: validSecret(),
				NAS_ROOT_PATH: "/mnt/niederlassungen",
				NODE_ENV: "production",
			})
		).toThrow(/MONGODB_URI/i);
	});

	it("rejects too-short SESSION_SECRET", () => {
		expect(() =>
			validateEnv({
				MONGODB_URI: "mongodb://localhost:27017/rhl",
				SESSION_SECRET: "short-secret",
				NAS_ROOT_PATH: "/mnt/niederlassungen",
			})
		).toThrow(/SESSION_SECRET/i);
	});

	it("rejects placeholder-like SESSION_SECRET even if long enough", () => {
		const secret = `change-me-${"x".repeat(64)}`;

		expect(() =>
			validateEnv({
				MONGODB_URI: "mongodb://localhost:27017/rhl",
				SESSION_SECRET: secret,
				NAS_ROOT_PATH: "/mnt/niederlassungen",
			})
		).toThrow(/placeholder/i);
	});

	it("rejects NAS_ROOT_PATH that is not absolute", () => {
		expect(() =>
			validateEnv({
				MONGODB_URI: "mongodb://localhost:27017/rhl",
				SESSION_SECRET: validSecret(),
				NAS_ROOT_PATH: "mnt/niederlassungen",
			})
		).toThrow(/NAS_ROOT_PATH/i);
	});

	it('rejects NAS_ROOT_PATH containing ".." segments', () => {
		expect(() =>
			validateEnv({
				MONGODB_URI: "mongodb://localhost:27017/rhl",
				SESSION_SECRET: validSecret(),
				NAS_ROOT_PATH: "/mnt/../etc",
			})
		).toThrow(/NAS_ROOT_PATH/i);
	});

	it("rejects invalid NODE_ENV values", () => {
		expect(() =>
			validateEnv({
				MONGODB_URI: "mongodb://localhost:27017/rhl",
				SESSION_SECRET: validSecret(),
				NAS_ROOT_PATH: "/mnt/niederlassungen",
				NODE_ENV: "staging",
			})
		).toThrow(/NODE_ENV/i);
	});

	it("rejects invalid PORT values", () => {
		expect(() =>
			validateEnv({
				MONGODB_URI: "mongodb://localhost:27017/rhl",
				SESSION_SECRET: validSecret(),
				NAS_ROOT_PATH: "/mnt/niederlassungen",
				PORT: "70000",
			})
		).toThrow(/PORT/i);

		expect(() =>
			validateEnv({
				MONGODB_URI: "mongodb://localhost:27017/rhl",
				SESSION_SECRET: validSecret(),
				NAS_ROOT_PATH: "/mnt/niederlassungen",
				PORT: "abc",
			})
		).toThrow(/PORT/i);
	});
});