import Database from 'better-sqlite3';
import { execFileSync } from 'node:child_process';
import { readFileSync, readdirSync, mkdtempSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import path from 'node:path';
import { afterEach, beforeEach, describe, expect, it } from 'vitest';
import type { Cookies } from '@sveltejs/kit';

const temporaryDirectories: string[] = [];
let directory: string;
let databasePath: string;

function testCookies(): Cookies {
	const values = new Map<string, string>();
	return {
		get: (name: string) => values.get(name),
		getAll: () => Array.from(values, ([name, value]) => ({ name, value })),
		set: (name: string, value: string) => {
			values.set(name, value);
		},
		delete: (name: string) => {
			values.delete(name);
		},
		serialize: () => ''
	} as unknown as Cookies;
}

function tokenFromLatestMail(): string {
	const outbox = path.join(directory, 'outbox');
	const files = readdirSync(outbox).sort();
	const message = JSON.parse(readFileSync(path.join(outbox, files.at(-1)!), 'utf8')) as {
		text: string;
	};
	const match = message.text.match(/[?&]token=([^\s]+)/);
	if (!match) throw new Error('Testmail enthält keinen Token.');
	return decodeURIComponent(match[1]);
}

beforeEach(() => {
	directory = mkdtempSync(path.join(tmpdir(), 'sendewerk-auth-test-'));
	temporaryDirectories.push(directory);
	databasePath = path.join(directory, 'test.sqlite');
	process.env.SENDEWERK_DB_PATH = databasePath;
	process.env.SENDEWERK_UPLOAD_DIR = path.join(directory, 'uploads');
	process.env.SENDEWERK_MAIL_OUTBOX_DIR = path.join(directory, 'outbox');
	process.env.SENDEWERK_MAIL_TRANSPORT = 'local';
	process.env.SENDEWERK_APP_ORIGIN = 'http://localhost:5173';
	process.env.SENDEWERK_SETUP_TOKEN = 'a'.repeat(32);
	execFileSync(process.execPath, ['scripts/migrate.mjs'], { cwd: process.cwd(), env: process.env });
});

afterEach(async () => {
	const { closeDatabase } = await import('./database.js');
	closeDatabase();
	for (const name of [
		'SENDEWERK_DB_PATH',
		'SENDEWERK_UPLOAD_DIR',
		'SENDEWERK_MAIL_OUTBOX_DIR',
		'SENDEWERK_MAIL_TRANSPORT',
		'SENDEWERK_MAIL_FROM',
		'SENDEWERK_SMTP_HOST',
		'SENDEWERK_APP_ORIGIN',
		'SENDEWERK_SETUP_TOKEN'
	]) {
		delete process.env[name];
	}
	for (const temporaryDirectory of temporaryDirectories.splice(0)) {
		rmSync(temporaryDirectory, { recursive: true, force: true });
	}
});

describe('authentication', () => {
	it('creates the first Barkeeper once and stores no plaintext secret', async () => {
		const { createFirstAdmin } = await import('./auth.js');
		const password = 'Ein-sehr-langes-Testpasswort';
		const user = await createFirstAdmin({
			setupToken: 'a'.repeat(32),
			email: 'Bar@example.org',
			displayName: 'Erster Barkeeper',
			password
		});
		const database = new Database(databasePath, { readonly: true });
		const row = database.prepare('SELECT * FROM users').get() as {
			role: string;
			email_normalized: string;
			password_hash: string;
		};
		database.close();

		expect(user.role).toBe('barkeeper');
		expect(row.email_normalized).toBe('bar@example.org');
		expect(row.password_hash).not.toContain(password);
		await expect(
			createFirstAdmin({
				setupToken: 'a'.repeat(32),
				email: 'second@example.org',
				displayName: 'Zweiter Admin',
				password
			})
		).rejects.toThrow('SETUP_CLOSED');
	});

	it('accepts an invitation only once and rejects an expired invitation', async () => {
		const { acceptInvitation, createFirstAdmin, inviteUser } = await import('./auth.js');
		const admin = await createFirstAdmin({
			setupToken: 'a'.repeat(32),
			email: 'admin@example.org',
			displayName: 'Admin',
			password: 'Admin-Passwort-1234'
		});
		await inviteUser(admin, 'crew@example.org', 'thekencrew');
		const firstToken = tokenFromLatestMail();
		const crew = await acceptInvitation({
			token: firstToken,
			displayName: 'Crew',
			password: 'Crew-Passwort-1234'
		});
		expect(crew.role).toBe('thekencrew');
		await expect(
			acceptInvitation({
				token: firstToken,
				displayName: 'Crew',
				password: 'Crew-Passwort-1234'
			})
		).rejects.toThrow('TOKEN_INVALID');

		await inviteUser(admin, 'late@example.org', 'thekencrew');
		const expiredToken = tokenFromLatestMail();
		const database = new Database(databasePath);
		database.prepare("UPDATE invitations SET expires_at_utc = '2000-01-01T00:00:00.000Z'").run();
		database.close();
		await expect(
			acceptInvitation({
				token: expiredToken,
				displayName: 'Zu spät',
				password: 'Crew-Passwort-1234'
			})
		).rejects.toThrow('TOKEN_INVALID');
	});

	it('revokes active sessions immediately when a user is locked', async () => {
		const { createFirstAdmin, createSession, getSessionUser, setUserLocked, SESSION_COOKIE } =
			await import('./auth.js');
		const admin = await createFirstAdmin({
			setupToken: 'a'.repeat(32),
			email: 'admin@example.org',
			displayName: 'Admin',
			password: 'Admin-Passwort-1234'
		});
		const database = new Database(databasePath);
		const crewId = crypto.randomUUID();
		database
			.prepare(
				`INSERT INTO users (id, email, email_normalized, display_name, password_hash, role,
				 password_changed_at_utc, created_at_utc, updated_at_utc)
				 SELECT ?, 'crew@example.org', 'crew@example.org', 'Crew', password_hash, 'thekencrew',
				 password_changed_at_utc, created_at_utc, updated_at_utc FROM users WHERE id = ?`
			)
			.run(crewId, admin.id);
		database.close();
		const cookies = testCookies();
		createSession(crewId, cookies);
		const token = cookies.get(SESSION_COOKIE);
		expect(getSessionUser(token)?.id).toBe(crewId);

		setUserLocked(admin, crewId, true);
		expect(getSessionUser(token)).toBeNull();
	});

	it('uses password reset links once and invalidates prior sessions', async () => {
		const {
			authenticate,
			createFirstAdmin,
			createSession,
			getSessionUser,
			requestPasswordReset,
			resetPassword,
			SESSION_COOKIE
		} = await import('./auth.js');
		const admin = await createFirstAdmin({
			setupToken: 'a'.repeat(32),
			email: 'admin@example.org',
			displayName: 'Admin',
			password: 'Altes-Passwort-1234'
		});
		const cookies = testCookies();
		createSession(admin.id, cookies);
		const sessionToken = cookies.get(SESSION_COOKIE);
		await requestPasswordReset(admin.email);
		const expiredToken = tokenFromLatestMail();
		const database = new Database(databasePath);
		database
			.prepare("UPDATE password_reset_tokens SET expires_at_utc = '2000-01-01T00:00:00.000Z'")
			.run();
		database.close();
		await expect(resetPassword(expiredToken, 'Neues-Passwort-1234')).rejects.toThrow(
			'TOKEN_INVALID'
		);
		await requestPasswordReset(admin.email);
		const resetToken = tokenFromLatestMail();
		await resetPassword(resetToken, 'Neues-Passwort-1234');

		expect(getSessionUser(sessionToken)).toBeNull();
		expect(await authenticate(admin.email, 'Altes-Passwort-1234')).toBeNull();
		expect(await authenticate(admin.email, 'Neues-Passwort-1234')).not.toBeNull();
		await expect(resetPassword(resetToken, 'Noch-ein-Passwort-1234')).rejects.toThrow(
			'TOKEN_INVALID'
		);
	});

	it('rate limits repeated failed login attempts without locking the account', async () => {
		const { authenticate, createFirstAdmin, loginIsRateLimited, reserveLoginAttempt } =
			await import('./auth.js');
		await createFirstAdmin({
			setupToken: 'a'.repeat(32),
			email: 'admin@example.org',
			displayName: 'Admin',
			password: 'Admin-Passwort-1234'
		});
		for (let attempt = 0; attempt < 5; attempt += 1) {
			expect(reserveLoginAttempt('admin@example.org', '127.0.0.1')).toBe(true);
			expect(await authenticate('admin@example.org', 'falsch')).toBeNull();
		}
		expect(loginIsRateLimited('admin@example.org', '127.0.0.1')).toBe(true);
		const database = new Database(databasePath, { readonly: true });
		const user = database.prepare('SELECT locked_at_utc FROM users').get() as {
			locked_at_utc: string | null;
		};
		database.close();
		expect(user.locked_at_utc).toBeNull();
	});

	it('denies administrative operations to Thekencrew', async () => {
		const { requireBarkeeper } = await import('./auth.js');
		expect(() =>
			requireBarkeeper({
				id: 'crew',
				email: 'crew@example.org',
				displayName: 'Crew',
				role: 'thekencrew',
				lockedAtUtc: null
			})
		).toThrow();
	});

	it('never falls back to local delivery when SMTP was selected', async () => {
		process.env.SENDEWERK_MAIL_TRANSPORT = 'smtp';
		process.env.SENDEWERK_MAIL_FROM = '';
		process.env.SENDEWERK_SMTP_HOST = '';
		const { sendMail } = await import('./mail.js');
		await expect(
			sendMail({ to: 'test@example.org', subject: 'Test', text: 'Keine echte Nachricht' })
		).rejects.toThrow('SMTP-Konfiguration');
	});
});