"""
DSI Discovery Helpers — resilient navigation, consent dismissal, PDF redirect detection.

Extracted from dsi_discovery.py to keep modules under 500 LOC.
"""

import logging

from playwright.async_api import Page, TimeoutError as PlaywrightTimeout

logger = logging.getLogger(__name__)


async def goto_resilient(page: Page, url: str, timeout: int = 60000) -> None:
    """Navigate to URL with fallback: try networkidle first, then domcontentloaded.

    SPAs like Zalando never reach networkidle because of continuous background
    requests. Falling back to domcontentloaded + a short wait gives JS time to
    render the main content without waiting for every network request to finish.
    """
    try:
        await page.goto(url, wait_until="networkidle", timeout=timeout)
    except PlaywrightTimeout:
        logger.info("networkidle timeout for %s, falling back to domcontentloaded", url)
        await page.goto(url, wait_until="domcontentloaded", timeout=timeout)
        await page.wait_for_timeout(5000)  # extra wait for JS rendering


async def try_dismiss_consent_banner(page: Page) -> bool:
    """Try to dismiss cookie consent banners that block page content.

    Handles shadow DOM (Usercentrics), iframes (Sourcepoint), and regular
    DOM banners (OneTrust, Cookiebot, Didomi, etc.).
    Returns True if a banner was dismissed.
    """
    # 1) Usercentrics shadow DOM — most common for German sites
    try:
        uc_root = await page.query_selector("#usercentrics-root")
        if uc_root:
            clicked = await page.evaluate("""() => {
                const root = document.querySelector('#usercentrics-root');
                if (!root || !root.shadowRoot) return false;
                const buttons = root.shadowRoot.querySelectorAll('button');
                for (const btn of buttons) {
                    const t = btn.textContent.trim().toLowerCase();
                    if (t.includes('akzeptieren') || t.includes('accept')
                        || t.includes('zustimmen') || t.includes('agree')) {
                        btn.click();
                        return true;
                    }
                }
                return false;
            }""")
            if clicked:
                logger.info("Dismissed Usercentrics consent banner (shadow DOM)")
                await page.wait_for_timeout(2000)
                return True
    except Exception:
        pass

    # 2) Standard DOM banners — OneTrust, Cookiebot, Didomi, Borlabs, etc.
    accept_selectors = [
        "#onetrust-accept-btn-handler",
        "#CybotCookiebotDialogBodyLevelButtonLevelOptinAllowAll",
        "#didomi-notice-agree-button",
        "#BorlabsCookieBox .cookie-accept, [data-cookie-accept]",
        ".cmpboxbtn.cmpboxbtnyes",
        ".klaro .cm-btn-accept",
        ".cky-btn-accept",
        "[class*='qc-cmp2-summary-buttons'] button:first-child",
        "#tarteaucitronPersonalize2",
    ]
    for sel in accept_selectors:
        try:
            btn = page.locator(sel).first
            if await btn.count() > 0 and await btn.is_visible():
                await btn.click(timeout=3000)
                logger.info("Dismissed consent banner via %s", sel)
                await page.wait_for_timeout(2000)
                return True
        except Exception:
            continue

    # 3) Generic text-based button search
    accept_texts = [
        "Alle akzeptieren", "Alles akzeptieren", "Alle Cookies akzeptieren",
        "Accept all", "Accept All Cookies", "Akzeptieren", "Zustimmen",
        "Einverstanden", "Ich stimme zu",
    ]
    try:
        clicked = await page.evaluate("""(texts) => {
            for (const btn of document.querySelectorAll('button, a[role="button"]')) {
                const t = (btn.textContent || '').trim();
                for (const target of texts) {
                    if (t === target) { btn.click(); return true; }
                }
            }
            return false;
        }""", accept_texts)
        if clicked:
            logger.info("Dismissed consent banner via generic text match")
            await page.wait_for_timeout(2000)
            return True
    except Exception:
        pass

    return False


def is_pdf_redirect(original_url: str, final_url: str) -> bool:
    """Check if the page redirected to a PDF or external storage."""
    final_lower = final_url.lower()
    return (
        final_lower.endswith(".pdf")
        or "storage.googleapis.com" in final_lower
        or "blob.core.windows.net" in final_lower
        or "s3.amazonaws.com" in final_lower
    )