/**
 * Tests for security/safe-fetch.js
 *
 * Tests the safeFetch wrapper that validates URLs before making
 * fetch requests, blocking unsafe external URLs.
 */

// Load url-validator first (safe-fetch depends on it)
import '@js/security/url-validator.js';
import '@js/security/safe-fetch.js';
// safeFetchWithAuth reuses the shared 401 helpers exposed on window.api
import '@js/services/api.js';

describe('safeFetch', () => {
    const originalFetch = globalThis.fetch;

    beforeEach(() => {
        globalThis.fetch = vi.fn(() =>
            Promise.resolve(new Response('ok', { status: 200 }))
        );
    });

    afterEach(() => {
        globalThis.fetch = originalFetch;
    });

    it('allows internal URLs starting with /', async () => {
        await window.safeFetch('/api/research/1');
        expect(globalThis.fetch).toHaveBeenCalledWith('/api/research/1', {});
    });

    it('allows internal URLs with custom options', async () => {
        const opts = { method: 'POST', body: '{}' };
        await window.safeFetch('/api/start', opts);
        expect(globalThis.fetch).toHaveBeenCalledWith('/api/start', opts);
    });

    it('allows safe external URLs (https)', async () => {
        await window.safeFetch('https://example.com/api');
        expect(globalThis.fetch).toHaveBeenCalled();
    });

    it('allows safe external URLs (http)', async () => {
        await window.safeFetch('http://example.com/api');
        expect(globalThis.fetch).toHaveBeenCalled();
    });

    it('blocks javascript: URLs', async () => {
        await expect(window.safeFetch('javascript:alert(1)'))
            .rejects.toThrow('Blocked unsafe URL');
    });

    it('blocks data: URLs', async () => {
        await expect(window.safeFetch('data:text/html,<h1>xss</h1>'))
            .rejects.toThrow('Blocked unsafe URL');
    });

    it('blocks vbscript: URLs', async () => {
        await expect(window.safeFetch('vbscript:msgbox'))
            .rejects.toThrow('Blocked unsafe URL');
    });

    it('does not call fetch for blocked URLs', async () => {
        try {
            await window.safeFetch('javascript:void(0)');
        } catch {}
        expect(globalThis.fetch).not.toHaveBeenCalled();
    });
});

describe('safeFetchWithAuth', () => {
    const originalFetch = globalThis.fetch;
    const originalLocation = window.location;

    beforeEach(() => {
        // Writable stub so the redirect assignment doesn't navigate the runner.
        delete window.location;
        window.location = {
            href: 'http://localhost/library/collections',
            pathname: '/library/collections',
            search: '',
            hash: '',
        };
    });

    afterEach(() => {
        globalThis.fetch = originalFetch;
        window.location = originalLocation;
    });

    it('returns the Response unchanged on 200 (no redirect)', async () => {
        globalThis.fetch = vi.fn(() =>
            Promise.resolve(new Response('{"ok":true}', { status: 200 }))
        );
        const response = await window.safeFetchWithAuth('/library/api/collections');
        expect(response.status).toBe(200);
        expect(window.location.href).toBe('http://localhost/library/collections');
    });

    it('redirects to /auth/login with next= on 401 for an internal URL', async () => {
        globalThis.fetch = vi.fn(() =>
            Promise.resolve(new Response('{"error":"auth"}', { status: 401 }))
        );

        // On the redirect path the call returns a never-resolving Promise.
        const result = await Promise.race([
            window.safeFetchWithAuth('/library/api/collections'),
            new Promise((resolve) => setTimeout(() => resolve('timeout'), 50)),
        ]);

        expect(result).toBe('timeout'); // never resolved
        expect(window.location.href).toBe(
            `/auth/login?next=${encodeURIComponent('/library/collections')}`
        );
    });

    it('returns the Response unchanged on a non-401 error (no redirect)', async () => {
        globalThis.fetch = vi.fn(() =>
            Promise.resolve(new Response('{"error":"boom"}', { status: 500 }))
        );
        const response = await window.safeFetchWithAuth('/library/api/collections');
        expect(response.status).toBe(500);
        expect(window.location.href).toBe('http://localhost/library/collections');
    });

    it('does not redirect on 401 from an external URL', async () => {
        globalThis.fetch = vi.fn(() =>
            Promise.resolve(new Response('', { status: 401 }))
        );
        const response = await window.safeFetchWithAuth('https://api.example.com/foo');
        expect(response.status).toBe(401);
        expect(window.location.href).toBe('http://localhost/library/collections');
    });

    it('does not redirect on 401 while already on an /auth/* page', async () => {
        window.location.pathname = '/auth/login';
        window.location.href = 'http://localhost/auth/login';
        globalThis.fetch = vi.fn(() =>
            Promise.resolve(new Response('', { status: 401 }))
        );
        const response = await window.safeFetchWithAuth('/library/api/collections');
        expect(response.status).toBe(401);
        expect(window.location.href).toBe('http://localhost/auth/login');
    });

    it('still validates URLs (blocks javascript:)', async () => {
        await expect(
            window.safeFetchWithAuth('javascript:alert(1)')
        ).rejects.toThrow('Blocked unsafe URL');
    });
});