"""
Banner Detector — identifies Consent Management Platforms and their buttons.

Supports 30 CMPs with specific selectors + generic fallback + Shadow DOM.
"""

from dataclasses import dataclass

from playwright.async_api import Page


@dataclass
class BannerInfo:
    detected: bool
    provider: str
    accept_selector: str
    reject_selector: str


# CMP-specific selectors (ordered by market share)
CMP_SELECTORS = [
    {
        "name": "Didomi",
        "detect": "#didomi-host, [class*='didomi']",
        "accept": "#didomi-notice-agree-button",
        "reject": "#didomi-notice-disagree-button, .didomi-components-button--secondary",
    },
    {
        "name": "OneTrust",
        "detect": "#onetrust-banner-sdk, [class*='onetrust']",
        "accept": "#onetrust-accept-btn-handler",
        "reject": "#onetrust-reject-all-handler, .onetrust-close-btn-handler",
    },
    {
        "name": "Cookiebot",
        "detect": "#CybotCookiebotDialog, [class*='CybotCookiebot']",
        "accept": "#CybotCookiebotDialogBodyLevelButtonLevelOptinAllowAll",
        "reject": "#CybotCookiebotDialogBodyButtonDecline",
    },
    {
        "name": "Usercentrics",
        "detect": "#usercentrics-root, [data-testid='uc-banner']",
        "accept": "[data-testid='uc-accept-all-button']",
        "reject": "[data-testid='uc-deny-all-button']",
    },
    {
        "name": "CookieYes",
        "detect": ".cky-consent-container, [class*='cky-']",
        "accept": ".cky-btn-accept",
        "reject": ".cky-btn-reject, .cky-btn-customize",
    },
    {
        "name": "Quantcast",
        "detect": ".qc-cmp2-container, [class*='qc-cmp']",
        "accept": "[class*='qc-cmp2-summary-buttons'] button:first-child",
        "reject": "[class*='qc-cmp2-summary-buttons'] button:last-child",
    },
    {
        "name": "Borlabs",
        "detect": "#BorlabsCookieBox, [class*='BorlabsCookie']",
        "accept": "#BorlabsCookieBox .cookie-accept, [data-cookie-accept]",
        "reject": "#BorlabsCookieBox .cookie-refuse, [data-cookie-refuse]",
    },
    {
        "name": "Consentmanager",
        "detect": "#cmpbox, [class*='cmpbox']",
        "accept": ".cmpboxbtn.cmpboxbtnyes",
        "reject": ".cmpboxbtn.cmpboxbtnno",
    },
    {
        "name": "Klaro",
        "detect": ".klaro, [class*='klaro']",
        "accept": ".klaro .cm-btn-accept",
        "reject": ".klaro .cm-btn-decline",
    },
    {
        "name": "TarteAuCitron",
        "detect": "#tarteaucitronRoot, [class*='tarteaucitron']",
        "accept": "#tarteaucitronPersonalize2",
        "reject": "#tarteaucitronAllDenied2",
    },
    # --- 20 additional CMPs ---
    {
        "name": "Sourcepoint",
        "detect": "div[id^='sp_message']",
        "accept": ".sp_choice_type_11",
        "reject": ".sp_choice_type_13",
    },
    {
        "name": "Axeptio",
        "detect": "#axeptio_widget",
        "accept": "[data-ax='accept']",
        "reject": "[data-ax='decline']",
    },
    {
        "name": "Iubenda",
        "detect": "#iubenda-cs-banner",
        "accept": ".iubenda-cs-accept-btn",
        "reject": ".iubenda-cs-reject-btn",
    },
    {
        "name": "Termly",
        "detect": "#termly-code-snippet-support",
        "accept": "[data-tid='banner-accept']",
        "reject": "[data-tid='banner-decline']",
    },
    {
        "name": "CookieFirst",
        "detect": "#cookiefirst-root",
        "accept": "[data-cookiefirst-action='accept']",
        "reject": "[data-cookiefirst-action='reject']",
    },
    {
        "name": "Complianz",
        "detect": "#cmplz-cookiebanner-container",
        "accept": ".cmplz-accept",
        "reject": ".cmplz-deny",
    },
    {
        "name": "CookieScript",
        "detect": "#cookiescript_injected",
        "accept": "#cookiescript_accept",
        "reject": "#cookiescript_reject",
    },
    {
        "name": "HubSpot",
        "detect": "#hs-eu-cookie-confirmation",
        "accept": "#hs-eu-confirmation-button",
        "reject": "#hs-eu-decline-button",
    },
    {
        "name": "Civic UK",
        "detect": "#ccc, .ccc-content",
        "accept": "#ccc-recommended-settings",
        "reject": "#ccc-reject-settings",
    },
    {
        "name": "GDPR Cookie Compliance",
        "detect": "#moove_gdpr_cookie_modal",
        "accept": ".moove-gdpr-modal-allow-all",
        "reject": ".moove-gdpr-modal-save-settings",
    },
    {
        "name": "CookieHub",
        "detect": "#ch2-container",
        "accept": "#ch2-btn-accept",
        "reject": "#ch2-btn-decline",
    },
    {
        "name": "Osano",
        "detect": ".osano-cm-dialog",
        "accept": ".osano-cm-accept-all",
        "reject": ".osano-cm-deny",
    },
    {
        "name": "Ketch",
        "detect": "#ketch-consent",
        "accept": "[data-testid='accept-button']",
        "reject": "[data-testid='decline-button']",
    },
    {
        "name": "Piwik PRO",
        "detect": "#ppms_cm_popup_overlay",
        "accept": "#ppms_cm_agree-to-all",
        "reject": "#ppms_cm_reject-all",
    },
    {
        "name": "Cookie Consent (Insites)",
        "detect": ".cc-window",
        "accept": ".cc-btn.cc-allow",
        "reject": ".cc-btn.cc-deny",
    },
    {
        "name": "Admiral",
        "detect": "[id^='admiral-']",
        "accept": "[class*='admiral-accept']",
        "reject": "[class*='admiral-reject']",
    },
    {
        "name": "Sibbo",
        "detect": "#sibbo-cmp-layout",
        "accept": "#sibbo-cmp-accept-all",
        "reject": "#sibbo-cmp-reject-all",
    },
    {
        "name": "Evidon",
        "detect": "#_evidon_banner",
        "accept": "#_evidon-accept-button",
        "reject": "#_evidon-decline-button",
    },
    {
        "name": "LiveRamp",
        "detect": "#_lr-cookie-consent",
        "accept": "#_lr-accept-all",
        "reject": "#_lr-reject-all",
    },
    {
        "name": "Adsimple",
        "detect": "#adconsent-usp-banner",
        "accept": ".adconsent-accept-all",
        "reject": ".adconsent-reject-all",
    },
]

# Generic fallback patterns (text-based)
GENERIC_ACCEPT_TEXTS = [
    "Alle akzeptieren", "Alles akzeptieren", "Alle Cookies akzeptieren",
    "Accept all", "Accept All Cookies", "Akzeptieren", "Zustimmen",
    "Einverstanden", "Ich stimme zu", "Ja, einverstanden",
]

GENERIC_REJECT_TEXTS = [
    "Nur notwendige", "Nur essentielle", "Ablehnen", "Alle ablehnen",
    "Reject", "Reject all", "Nur erforderliche", "Nur technisch notwendige",
    "Decline", "Nein", "Nicht einverstanden",
]

# Attribute-based generic selectors for consent buttons
_GENERIC_ATTR_ACCEPT = [
    "[data-consent='accept']", "[data-cookie='accept']", "[data-gdpr='accept']",
    "[data-consent-accept]", "[data-cookie-accept]",
]
_GENERIC_ATTR_REJECT = [
    "[data-consent='reject']", "[data-cookie='reject']", "[data-gdpr='reject']",
    "[data-consent-reject]", "[data-cookie-reject]",
]

# Dialog / aria selectors to find consent containers
_DIALOG_SELECTORS = [
    "[role='dialog']",
    "[aria-label*='cookie' i]", "[aria-label*='consent' i]",
    "[aria-label*='datenschutz' i]", "[aria-label*='Cookie' i]",
]

# JavaScript for recursive Shadow DOM search
_SHADOW_DETECT_JS = """
() => {
    const KEYWORDS = /cookie|consent|datenschutz|privacy/i;
    const results = [];
    function walk(root) {
        for (const el of root.querySelectorAll('*')) {
            if (el.shadowRoot) {
                const shadow = el.shadowRoot;
                const text = shadow.innerHTML || '';
                if (KEYWORDS.test(text)) {
                    const buttons = [];
                    for (const btn of shadow.querySelectorAll(
                        'button, a[role="button"], [role="button"]'
                    )) {
                        const t = (btn.textContent || '').trim();
                        if (t.length > 0 && t.length < 80) {
                            buttons.push(t);
                        }
                    }
                    if (buttons.length > 0) {
                        const tag = el.tagName.toLowerCase();
                        const id = el.id ? '#' + el.id : '';
                        results.push({
                            host: tag + id,
                            buttons: buttons,
                            preview: text.substring(0, 200)
                        });
                    }
                }
                walk(shadow);
            }
        }
    }
    walk(document);
    return results.length > 0 ? results[0] : null;
}
"""

_SHADOW_CLICK_JS = """
(textPattern) => {
    const regex = new RegExp(textPattern, 'i');
    function walk(root) {
        for (const el of root.querySelectorAll('*')) {
            if (el.shadowRoot) {
                const btns = el.shadowRoot.querySelectorAll(
                    'button, a[role="button"], [role="button"]'
                );
                for (const btn of btns) {
                    if (regex.test(btn.textContent || '')) {
                        btn.click();
                        return true;
                    }
                }
                const found = walk(el.shadowRoot);
                if (found) return true;
            }
        }
        return false;
    }
    return walk(document);
}
"""


async def _detect_in_shadow_dom(page: Page) -> BannerInfo | None:
    """Search Shadow DOM roots for consent banners as last-resort fallback."""
    try:
        result = await page.evaluate(_SHADOW_DETECT_JS)
        if not result:
            return None
        buttons = result.get("buttons", [])
        host = result.get("host", "")
        accept_pat = ""
        reject_pat = ""
        accept_kw = ("accept", "akzeptieren", "zustimmen", "agree", "allow",
                      "einverstanden", "alle")
        reject_kw = ("reject", "ablehnen", "deny", "decline", "refuse",
                      "notwendig", "necessary", "essential")
        for text in buttons:
            low = text.lower()
            if not accept_pat and any(k in low for k in accept_kw):
                accept_pat = text
            elif not reject_pat and any(k in low for k in reject_kw):
                reject_pat = text
        if not accept_pat and not reject_pat:
            return None
        return BannerInfo(
            detected=True,
            provider=f"ShadowDOM({host})",
            accept_selector=f"shadow-click:{accept_pat}" if accept_pat else "",
            reject_selector=f"shadow-click:{reject_pat}" if reject_pat else "",
        )
    except Exception:
        return None


async def _click_in_shadow_dom(page: Page, text_pattern: str) -> bool:
    """Click a button inside a Shadow DOM root matching the text pattern."""
    try:
        return await page.evaluate(_SHADOW_CLICK_JS, text_pattern)
    except Exception:
        return False


async def _detect_generic_dialog(page: Page) -> BannerInfo | None:
    """Detect consent banners in dialog/aria containers."""
    consent_kw = ("cookie", "consent", "datenschutz", "privacy")
    for sel in _DIALOG_SELECTORS:
        try:
            containers = page.locator(sel)
            count = await containers.count()
            if count == 0:
                continue
            container = containers.first
            text = (await container.inner_text(timeout=2000)).lower()
            if not any(kw in text for kw in consent_kw):
                continue
            # Found a consent dialog — look for accept/reject buttons
            accept = ""
            reject = ""
            for asel in _GENERIC_ATTR_ACCEPT:
                if await container.locator(asel).count() > 0:
                    accept = f"{sel} {asel}"
                    break
            for rsel in _GENERIC_ATTR_REJECT:
                if await container.locator(rsel).count() > 0:
                    reject = f"{sel} {rsel}"
                    break
            if not accept:
                for t in GENERIC_ACCEPT_TEXTS:
                    if await container.get_by_text(t, exact=False).count() > 0:
                        accept = f'{sel} button:has-text("{t}")'
                        break
            if not reject:
                for t in GENERIC_REJECT_TEXTS:
                    if await container.get_by_text(t, exact=False).count() > 0:
                        reject = f'{sel} button:has-text("{t}")'
                        break
            if accept or reject:
                return BannerInfo(
                    detected=True, provider="Generic (dialog)",
                    accept_selector=accept, reject_selector=reject,
                )
        except Exception:
            continue
    return None


async def _detect_generic_attr(page: Page) -> BannerInfo | None:
    """Detect consent buttons by data-consent/data-cookie/data-gdpr attributes."""
    accept = ""
    reject = ""
    for sel in _GENERIC_ATTR_ACCEPT:
        try:
            if await page.locator(sel).count() > 0:
                accept = sel
                break
        except Exception:
            continue
    for sel in _GENERIC_ATTR_REJECT:
        try:
            if await page.locator(sel).count() > 0:
                reject = sel
                break
        except Exception:
            continue
    if accept or reject:
        return BannerInfo(
            detected=True, provider="Generic (attr)",
            accept_selector=accept, reject_selector=reject,
        )
    return None


async def detect_banner(page: Page) -> BannerInfo:
    """Detect which CMP is used and return button selectors."""
    # 1. Try CMP-specific selectors
    for cmp in CMP_SELECTORS:
        try:
            if await page.locator(cmp["detect"]).count() > 0:
                return BannerInfo(
                    detected=True, provider=cmp["name"],
                    accept_selector=cmp["accept"],
                    reject_selector=cmp["reject"],
                )
        except Exception:
            continue

    # 2. Generic fallback — search buttons by text
    for text in GENERIC_ACCEPT_TEXTS:
        try:
            btn = page.get_by_text(text, exact=False)
            if await btn.count() > 0:
                accept = f'button:has-text("{text}")'
                reject = ""
                for rtext in GENERIC_REJECT_TEXTS:
                    if await page.get_by_text(rtext, exact=False).count() > 0:
                        reject = f'button:has-text("{rtext}")'
                        break
                return BannerInfo(
                    detected=True, provider="Generic",
                    accept_selector=accept, reject_selector=reject,
                )
        except Exception:
            continue

    # 3. Generic fallback — dialog/aria containers with consent keywords
    dialog_result = await _detect_generic_dialog(page)
    if dialog_result:
        return dialog_result

    # 4. Generic fallback — data-consent/data-cookie/data-gdpr attributes
    attr_result = await _detect_generic_attr(page)
    if attr_result:
        return attr_result

    # 5. Shadow DOM fallback — search inside shadow roots
    shadow_result = await _detect_in_shadow_dom(page)
    if shadow_result:
        return shadow_result

    return BannerInfo(detected=False, provider="", accept_selector="", reject_selector="")


async def click_button(page: Page, selector: str, timeout: int = 5000) -> bool:
    """Try to click a consent button. Returns True if clicked successfully."""
    if not selector:
        return False

    # Handle Shadow DOM selectors
    if selector.startswith("shadow-click:"):
        text_pattern = selector[len("shadow-click:"):]
        return await _click_in_shadow_dom(page, text_pattern)

    try:
        locator = page.locator(selector).first
        await locator.wait_for(state="visible", timeout=timeout)
        await locator.click()
        return True
    except Exception:
        # Fallback: try Shadow DOM click with selector text
        # Extract button text from selector like 'button:has-text("Accept all")'
        if ':has-text("' in selector:
            text = selector.split(':has-text("')[1].rstrip('")')
            return await _click_in_shadow_dom(page, text)
        return False