/**
 * Tests for services/api.js — fetchWithErrorHandling 401 -> login redirect.
 *
 * fetchWithErrorHandling is the shared entry point for the core API surface
 * (research start/status/details/logs/history/report, config saves, deletes).
 * It throws on any non-2xx, so callers never see a bare 401. These tests lock
 * in the behavior that an expired session on an internal API call bounces the
 * user to /auth/login (preserving where they were) instead of surfacing an
 * opaque "API Error: 401", while the /auth/* flow and external URLs are left
 * untouched to avoid redirect loops and false positives.
 */

import '@js/services/api.js';

const { fetchWithErrorHandling, shouldRedirectToLoginOn401 } = window.api;

describe('shouldRedirectToLoginOn401', () => {
    const originalLocation = window.location;

    beforeEach(() => {
        delete window.location;
        window.location = { href: 'http://localhost/dashboard', pathname: '/dashboard', search: '' };
    });

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

    it('redirects for an internal API URL', () => {
        expect(shouldRedirectToLoginOn401('/api/history')).toBe(true);
    });

    it('does not redirect for an external URL', () => {
        expect(shouldRedirectToLoginOn401('https://api.example.com/foo')).toBe(false);
    });

    it('does not redirect for a protocol-relative (cross-origin) URL', () => {
        expect(shouldRedirectToLoginOn401('//api.example.com/foo')).toBe(false);
    });

    it('does not redirect for a backslash-bypass URL that resolves cross-origin', () => {
        // `/\evil.com` is normalized by browsers to https://evil.com (cross-origin)
        expect(shouldRedirectToLoginOn401('/\\evil.com')).toBe(false);
    });

    it('does not redirect for a request to /auth/*', () => {
        expect(shouldRedirectToLoginOn401('/auth/check')).toBe(false);
    });

    it('does not redirect while already on an /auth/* page', () => {
        window.location.pathname = '/auth/login';
        expect(shouldRedirectToLoginOn401('/api/history')).toBe(false);
    });
});

describe('fetchWithErrorHandling — 401 handling', () => {
    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/dashboard',
            pathname: '/dashboard',
            search: '',
            hash: '',
        };
    });

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

    it('returns parsed JSON on 200 without redirecting', async () => {
        globalThis.fetch = vi.fn(() =>
            Promise.resolve(new Response('{"ok":true}', { status: 200 }))
        );
        const data = await fetchWithErrorHandling('/api/history');
        expect(data).toEqual({ ok: true });
        expect(window.location.href).toBe('http://localhost/dashboard');
    });

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

        // On the redirect path the call returns a never-resolving Promise, so
        // race it against a short timeout to keep the test from hanging.
        const result = await Promise.race([
            fetchWithErrorHandling('/api/history'),
            new Promise((resolve) => setTimeout(() => resolve('timeout'), 50)),
        ]);

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

    it('preserves the query string and hash in next= (so #logs-style state survives re-login)', async () => {
        window.location.pathname = '/settings';
        window.location.search = '?tab=embeddings';
        window.location.hash = '#logs';
        window.location.href = 'http://localhost/settings?tab=embeddings#logs';
        globalThis.fetch = vi.fn(() =>
            Promise.resolve(new Response('', { status: 401 }))
        );

        await Promise.race([
            fetchWithErrorHandling('/api/history'),
            new Promise((resolve) => setTimeout(() => resolve('timeout'), 50)),
        ]);

        expect(window.location.href).toBe(
            `/auth/login?next=${encodeURIComponent('/settings?tab=embeddings#logs')}`
        );
    });

    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('{"error":"bad creds"}', { status: 401 }))
        );

        await expect(fetchWithErrorHandling('/api/history')).rejects.toThrow();
        expect(window.location.href).toBe('http://localhost/auth/login');
    });

    it('does not redirect on 401 when the request itself targets /auth/*', async () => {
        globalThis.fetch = vi.fn(() =>
            Promise.resolve(new Response('{"error":"bad creds"}', { status: 401 }))
        );

        await expect(fetchWithErrorHandling('/auth/check')).rejects.toThrow();
        expect(window.location.href).toBe('http://localhost/dashboard');
    });

    it('does not redirect on a non-401 error and throws the message', async () => {
        globalThis.fetch = vi.fn(() =>
            Promise.resolve(new Response('{"error":"boom"}', { status: 500 }))
        );

        await expect(fetchWithErrorHandling('/api/history')).rejects.toThrow('boom');
        expect(window.location.href).toBe('http://localhost/dashboard');
    });
});