Mangalord/frontend/e2e/reader-swipe.spec.ts

import { test, expect, type Page } from './fixtures';

// Single-page reader: a horizontal swipe turns the page; a mostly-vertical
// drag does not (so panning a tall page never turns it). Swipe is wired into
// the mobile tap-zone overlay, which only exists in single mode.

const MANGA_ID = 'm1';
const CHAPTER_ID = 'c1';

async function mockReader(page: Page) {
    await page.route('**/api/v1/**', async (route) => {
        const { pathname } = new URL(route.request().url());
        const json = (status: number, body: unknown) =>
            route.fulfill({ status, contentType: 'application/json', body: JSON.stringify(body) });

        if (pathname.includes('/files/')) {
            return route.fulfill({ status: 200, contentType: 'image/svg+xml', body: '<svg xmlns="http://www.w3.org/2000/svg" width="800" height="1000"/>' });
        }
        if (pathname.endsWith('/auth/config')) return json(200, { self_register_enabled: true, private_mode: false });
        if (pathname.endsWith('/auth/me')) return json(401, { error: { code: 'unauthenticated', message: 'no' } });
        if (pathname.endsWith('/auth/me/preferences')) return json(401, { error: { code: 'unauthenticated', message: 'no' } });
        if (pathname.endsWith(`/mangas/${MANGA_ID}/chapters/${CHAPTER_ID}/pages`)) {
            return json(200, { pages: [
                { id: 'p1', chapter_id: CHAPTER_ID, page_number: 1, storage_key: 'k/1', content_type: 'image/svg+xml' },
                { id: 'p2', chapter_id: CHAPTER_ID, page_number: 2, storage_key: 'k/2', content_type: 'image/svg+xml' }
            ] });
        }
        if (pathname.endsWith(`/mangas/${MANGA_ID}/chapters/${CHAPTER_ID}`)) return json(200, { id: CHAPTER_ID, manga_id: MANGA_ID, number: 1, title: null, page_count: 2, created_at: '2026-01-01T00:00:00Z', size_bytes: 0 });
        if (pathname.includes(`/mangas/${MANGA_ID}/chapters`)) return json(200, { items: [{ id: CHAPTER_ID, manga_id: MANGA_ID, number: 1, title: null, page_count: 2, created_at: '2026-01-01T00:00:00Z', size_bytes: 0 }], page: { limit: 200, offset: 0, total: 1 } });
        if (pathname.endsWith(`/mangas/${MANGA_ID}`)) return json(200, { id: MANGA_ID, title: 'Berserk', status: 'ongoing', alt_titles: [], description: null, cover_image_path: null, created_at: '2026-01-01T00:00:00Z', updated_at: '2026-01-01T00:00:00Z', authors: [], genres: [], tags: [], content_warnings: [], chapter_storage_bytes: 0 });
        if (pathname.includes('/me/read-progress')) return json(401, { error: { code: 'unauthenticated', message: 'no' } });
        return json(503, { error: { code: 'e2e_unmocked', message: pathname } });
    });
}

// Dispatch a touch pointer swipe on the tap-zone overlay.
async function swipe(page: Page, dx: number, dy: number) {
    await page.evaluate(
        ({ dx, dy }) => {
            const el = document.querySelector('[data-testid="reader-tap-center"]');
            if (!el) throw new Error('tap zone not found');
            const sx = 300;
            const sy = 500;
            const ev = (type: string, x: number, y: number) =>
                new PointerEvent(type, { clientX: x, clientY: y, pointerType: 'touch', bubbles: true, cancelable: true });
            el.dispatchEvent(ev('pointerdown', sx, sy));
            el.dispatchEvent(ev('pointermove', sx + dx / 2, sy + dy / 2));
            el.dispatchEvent(ev('pointerup', sx + dx, sy + dy));
        },
        { dx, dy }
    );
}

test('horizontal swipe turns the page; vertical drag does not', async ({ page }) => {
    await mockReader(page);
    await page.setViewportSize({ width: 390, height: 844 }); // mobile → tap zones render
    await page.goto(`/manga/${MANGA_ID}/chapter/${CHAPTER_ID}`);

    const img = page.getByTestId('reader-page');
    await expect(img).toHaveAttribute('src', /k\/1/);

    // A near-vertical drag must NOT turn the page.
    await swipe(page, 6, -220);
    await expect(img).toHaveAttribute('src', /k\/1/);

    // A leftward horizontal swipe advances to the next page.
    await swipe(page, -200, 8);
    await expect(img).toHaveAttribute('src', /k\/2/);

    // A rightward horizontal swipe goes back.
    await swipe(page, 200, 8);
    await expect(img).toHaveAttribute('src', /k\/1/);
});