import { expect, type Page } from '@playwright/test';

export const coreRoutePaths = ['/', '/product', '/trust', '/changelog', '/contact', '/privacy', '/imprint'] as const;
export const secondaryRoutePaths = ['/legal', '/terms', '/solutions', '/integrations'] as const;

export const primaryNavigationLabels = ['Product', 'Trust', 'Changelog', 'Contact'] as const;
export const hiddenPrimaryNavigationLabels = [
    'Solutions',
    'Integrations',
    'Security & Trust',
    'Resources',
    'Articles',
] as const;

export const footerLabels = ['Product', 'Changelog', 'Trust', 'Privacy', 'Imprint', 'Terms', 'Contact'] as const;
export const hiddenFooterLabels = ['Resources', 'Articles', 'Security & Trust', 'Contact / Demo'] as const;

export async function visitPage(page: Page, path: string): Promise<void> {
    await page.goto(path);
    await expect(page).toHaveURL(new RegExp(path === '/' ? '/?$' : `${path}$`));
}

export async function expectCompatibilityRedirect(page: Page, legacyPath: string, canonicalPath: string): Promise<void> {
    await page.goto(legacyPath);
    await page.waitForURL(new RegExp(canonicalPath === '/' ? '/?$' : `${canonicalPath}$`));
    await expect(page).toHaveURL(new RegExp(canonicalPath === '/' ? '/?$' : `${canonicalPath}$`));
}

export async function expectShell(page: Page, heading: string | RegExp): Promise<void> {
    await expect(page.getByRole('banner')).toBeVisible();
    await expect(page.getByRole('main')).toBeVisible();
    await expect(page.getByRole('contentinfo')).toBeVisible();
    await expect(page.getByRole('heading', { level: 1, name: heading })).toBeVisible();
}

export async function expectPageFamily(page: Page, family: 'content' | 'landing' | 'trust'): Promise<void> {
    await expect(page.locator(`[data-page-family="${family}"]`).first()).toBeVisible();
}

export async function expectPrimaryNavigation(page: Page): Promise<void> {
    const header = page.getByRole('banner');

    for (const label of primaryNavigationLabels) {
        const link = header.getByRole('link', { name: label, exact: true }).first();

        await expect(link).toBeVisible();
        await expect(link).toHaveAttribute('data-nav-link');
    }

    for (const label of hiddenPrimaryNavigationLabels) {
        await expect(header.getByRole('link', { name: label, exact: true })).toHaveCount(0);
    }
}

export async function expectFooterLinks(page: Page): Promise<void> {
    for (const label of footerLabels) {
        await expect(page.getByRole('contentinfo').getByRole('link', { name: label, exact: true })).toBeVisible();
    }

    for (const label of hiddenFooterLabels) {
        await expect(page.getByRole('contentinfo').getByRole('link', { name: label, exact: true })).toHaveCount(0);
    }
}

export async function openMobileNavigation(page: Page): Promise<void> {
    const menuTrigger = page.getByLabel('Open navigation menu');

    if (await menuTrigger.isVisible()) {
        await menuTrigger.click();
    }
}

export async function expectDisclosureLayer(page: Page, layer: '1' | '2' | '3'): Promise<void> {
    await expect(page.locator(`[data-disclosure-layer="${layer}"]`).first()).toBeVisible();
}

export async function expectCtaHierarchy(
    page: Page,
    primaryLabel: string | RegExp,
    secondaryLabel: string | RegExp,
): Promise<void> {
    const main = page.getByRole('main');

    await expect(main.locator('[data-cta-weight="primary"]').filter({ hasText: primaryLabel }).first()).toBeVisible();
    await expect(
        main.locator('[data-cta-weight="secondary"]').filter({ hasText: secondaryLabel }).first(),
    ).toBeVisible();
}

export async function expectHomepageHeroStructure(page: Page): Promise<void> {
    const hero = page.locator('[data-homepage-hero="true"]').first();

    await expect(hero).toBeVisible();
    await expect(hero.locator('[data-hero-text-core]').first()).toBeVisible();
    await expect(hero.locator('[data-hero-eyebrow]').first()).toBeVisible();
    await expect(hero.locator('[data-hero-heading]').getByRole('heading', { level: 1 })).toBeVisible();
    await expect(hero.locator('[data-hero-supporting-copy]').first()).toBeVisible();
    await expect(hero.locator('[data-hero-cta-pair]').first()).toBeVisible();
    await expect(hero.locator('[data-cta-slot="primary"]')).toHaveCount(1);
    await expect(hero.locator('[data-cta-slot="secondary"]')).toHaveCount(1);
    await expect(hero.locator('[data-hero-visual]').first()).toBeVisible();
}

export async function expectHomepageHeroCtaPair(
    page: Page,
    primaryLabel: string | RegExp,
    secondaryLabel: string | RegExp,
): Promise<void> {
    const hero = page.locator('[data-homepage-hero="true"]').first();

    await expect(hero.locator('[data-cta-weight="primary"]').filter({ hasText: primaryLabel }).first()).toBeVisible();
    await expect(
        hero.locator('[data-cta-weight="secondary"]').filter({ hasText: secondaryLabel }).first(),
    ).toBeVisible();
}

export async function expectHomepageHeroPrimaryAnchor(
    page: Page,
    anchor: 'headline' | 'product-visual' | 'composition',
): Promise<void> {
    const hero = page.locator('[data-homepage-hero="true"]').first();

    await expect(hero.locator(`[data-hero-primary-anchor="${anchor}"]`).first()).toBeVisible();
    await expect(hero.locator('[data-hero-primary-anchor]')).toHaveCount(1);
}

export async function expectHomepageHeroSupportingCopySubordination(page: Page): Promise<void> {
    const hero = page.locator('[data-homepage-hero="true"]').first();
    const heading = hero.locator('[data-hero-heading]').getByRole('heading', { level: 1 }).first();
    const supportingCopy = hero.locator('[data-hero-supporting-copy] p').first();

    await expect(hero.locator('[data-hero-supporting-copy]').first()).toHaveAttribute('data-hero-copy-role', 'supporting');

    const [headingFontSize, supportingCopyFontSize] = await Promise.all([
        heading.evaluate((element) => Number.parseFloat(window.getComputedStyle(element).fontSize)),
        supportingCopy.evaluate((element) => Number.parseFloat(window.getComputedStyle(element).fontSize)),
    ]);

    expect(headingFontSize, 'Hero heading should remain larger than supporting copy').toBeGreaterThan(
        supportingCopyFontSize,
    );
}

export async function expectHomepageHeroAnchorCtaAlignment(page: Page): Promise<void> {
    const hero = page.locator('[data-homepage-hero="true"]').first();
    const anchorGroup = hero.locator('[data-hero-anchor-group]').first();

    await expect(anchorGroup).toBeVisible();
    await expect(anchorGroup.locator('[data-hero-heading]').first()).toBeVisible();
    await expect(anchorGroup.locator('[data-hero-cta-pair]').first()).toBeVisible();
}

export async function expectHomepageHeroOrder(
    page: Page,
    segments: Array<'eyebrow' | 'headline' | 'supporting-copy' | 'cta-pair' | 'product-near-visual' | 'trust-subclaims'>,
): Promise<void> {
    const hero = page.locator('[data-homepage-hero="true"]').first();
    const actual = await hero.locator('[data-hero-segment]').evaluateAll((elements) =>
        elements
            .map((element) => element.getAttribute('data-hero-segment'))
            .filter(Boolean),
    );

    for (let i = 0; i < segments.length; i++) {
        expect(actual.indexOf(segments[i]), `Hero segment "${segments[i]}" should exist`).toBeGreaterThanOrEqual(0);

        if (i > 0) {
            expect(
                actual.indexOf(segments[i]),
                `Hero segment "${segments[i]}" should appear after "${segments[i - 1]}"`,
            ).toBeGreaterThan(actual.indexOf(segments[i - 1]));
        }
    }
}

export async function expectHomepageHeroTrustSignals(page: Page): Promise<void> {
    const hero = page.locator('[data-homepage-hero="true"]').first();
    const trustSignals = hero.locator('[data-hero-trust-signals] li');
    const count = await trustSignals.count();

    await expect(hero.locator('[data-hero-trust-signals]').first()).toBeVisible();
    expect(count).toBeGreaterThan(0);
    expect(count).toBeLessThanOrEqual(3);
}

export async function expectHomepageHeroVisualSemantics(
    page: Page,
    terms: Array<string | RegExp>,
): Promise<void> {
    const hero = page.locator('[data-homepage-hero="true"]').first();
    const visual = hero.locator('[data-hero-visual]').first();

    await expect(visual).toBeVisible();
    await expect(visual).toHaveAttribute('data-hero-visual-style', 'governance-surface');

    for (const term of terms) {
        await expect(visual).toContainText(term);
    }
}

export async function expectHomepageHeroSplitLayout(page: Page): Promise<void> {
    const hero = page.locator('[data-homepage-hero="true"]').first();
    const textPanel = hero.locator('[data-hero-panel="text"]').first();
    const visualPanel = hero.locator('[data-hero-panel="dashboard"]').first();

    await expect(textPanel).toBeVisible();
    await expect(visualPanel).toBeVisible();

    const [textBox, visualBox] = await Promise.all([textPanel.boundingBox(), visualPanel.boundingBox()]);

    expect(textBox, 'Hero text panel should have a bounding box').not.toBeNull();
    expect(visualBox, 'Hero visual panel should have a bounding box').not.toBeNull();

    if (!textBox || !visualBox) {
        return;
    }

    expect(
        textBox.x + textBox.width,
        'Desktop hero text should end before the visual surface begins so both read as one split composition',
    ).toBeLessThanOrEqual(visualBox.x + 48);
    expect(
        Math.abs(textBox.y - visualBox.y),
        'Desktop hero text and visual should share a horizontal composition instead of stacking far apart',
    ).toBeLessThan(140);
}

async function expectLocatorInInitialViewport(page: Page, selector: string, label: string): Promise<void> {
    const locator = page.locator(selector).first();
    const box = await locator.boundingBox();
    const viewport = page.viewportSize();

    await expect(locator).toBeVisible();

    expect(box, `${label} should have a bounding box`).not.toBeNull();
    expect(viewport, 'Viewport should be available').not.toBeNull();

    if (!box || !viewport) {
        return;
    }

    expect(box.y, `${label} should start within the initial viewport`).toBeLessThan(viewport.height);
    expect(box.y + Math.min(box.height, 32), `${label} should remain on screen at first paint`).toBeGreaterThan(0);
}

export async function expectHomepageHeroVisibleOnMobile(page: Page): Promise<void> {
    await expectLocatorInInitialViewport(
        page,
        '[data-homepage-hero="true"] [data-hero-primary-anchor]',
        'Hero primary anchor',
    );
    await expectLocatorInInitialViewport(page, '[data-homepage-hero="true"] [data-hero-cta-pair]', 'Hero CTA pair');
    await expect(page.locator('[data-homepage-hero="true"] [data-hero-visual]').first()).toBeVisible();
}

export async function expectHomepageHeroRouteTargets(page: Page, routes: string[]): Promise<void> {
    const hero = page.locator('[data-homepage-hero="true"]').first();

    for (const route of routes) {
        await expect(hero.locator(`a[href="${route}"]`).first(), `Route "${route}" should be reachable from hero`).toBeVisible();
    }
}

export async function expectNavigationVsCtaDifferentiation(page: Page): Promise<void> {
    const header = page.getByRole('banner');

    await expect(header.locator('[data-nav-link]').first()).toBeVisible();
    await expect(header.locator('[data-cta-weight="secondary"]').first()).toBeVisible();
}

export async function expectHomepageSectionOrder(page: Page, sections: string[]): Promise<void> {
    const main = page.getByRole('main');
    const sectionElements = main.locator('[data-section]');
    const count = await sectionElements.count();
    const actual: string[] = [];

    for (let i = 0; i < count; i++) {
        const name = await sectionElements.nth(i).getAttribute('data-section');

        if (name) {
            actual.push(name);
        }
    }

    for (let i = 0; i < sections.length; i++) {
        expect(actual.indexOf(sections[i]), `Section "${sections[i]}" should appear in order`).toBeGreaterThanOrEqual(0);

        if (i > 0) {
            expect(
                actual.indexOf(sections[i]),
                `Section "${sections[i]}" should appear after "${sections[i - 1]}"`,
            ).toBeGreaterThan(actual.indexOf(sections[i - 1]));
        }
    }
}

export async function expectProductNearVisual(page: Page, alt?: string | RegExp): Promise<void> {
    const main = page.getByRole('main');
    const visual = main.locator('[data-hero-visual] img, [data-hero-visual]').first();

    await expect(visual).toBeVisible();

    if (alt) {
        await expect(main.getByRole('img', { name: alt }).first()).toBeVisible();
    }
}

export async function expectMobileReadability(page: Page): Promise<void> {
    const main = page.getByRole('main');

    await expect(main).toBeVisible();
    await expect(page.getByRole('banner')).toBeVisible();
    await expect(page.getByRole('contentinfo')).toBeVisible();
}

export async function expectOnwardRouteReachable(page: Page, routes: string[]): Promise<void> {
    const main = page.getByRole('main');

    for (const route of routes) {
        await expect(
            main.locator(`a[href="${route}"]`).first(),
            `Route "${route}" should be reachable from main content`,
        ).toBeVisible();
    }
}