from datetime import timedelta

from django.utils import timezone

from .models import ListingClick


def _clean_param(params, key: str, max_len: int = 255) -> str:
    raw = params.get(key)
    if raw is None:
        return ""
    s = str(raw).strip()
    return s[:max_len]


def classify_traffic(
    *,
    utm_source: str,
    utm_medium: str,
    utm_campaign: str,
    utm_term: str,
    utm_content: str,
    gclid: str,
    fbclid: str,
) -> str:
    if any(
        (
            utm_source,
            utm_medium,
            utm_campaign,
            utm_term,
            utm_content,
            gclid,
            fbclid,
        )
    ):
        return ListingClick.TrafficType.MARKETING
    return ListingClick.TrafficType.ORGANIC


def extract_attribution_from_request(request) -> dict:
    p = request.query_params if hasattr(request, "query_params") else request.GET
    utm_source = _clean_param(p, "utm_source")
    utm_medium = _clean_param(p, "utm_medium")
    utm_campaign = _clean_param(p, "utm_campaign")
    utm_term = _clean_param(p, "utm_term")
    utm_content = _clean_param(p, "utm_content")
    gclid = _clean_param(p, "gclid")
    fbclid = _clean_param(p, "fbclid")
    referrer = ""
    if hasattr(request, "META"):
        ref = request.META.get("HTTP_REFERER") or ""
        referrer = ref[:2048]
    traffic_type = classify_traffic(
        utm_source=utm_source,
        utm_medium=utm_medium,
        utm_campaign=utm_campaign,
        utm_term=utm_term,
        utm_content=utm_content,
        gclid=gclid,
        fbclid=fbclid,
    )
    return {
        "utm_source": utm_source,
        "utm_medium": utm_medium,
        "utm_campaign": utm_campaign,
        "utm_term": utm_term,
        "utm_content": utm_content,
        "gclid": gclid,
        "fbclid": fbclid,
        "referrer": referrer,
        "traffic_type": traffic_type,
    }


def record_equipment_listing_click(request, equipment_item) -> ListingClick:
    attrs = extract_attribution_from_request(request)
    user = request.user if getattr(request, "user", None) and request.user.is_authenticated else None
    return ListingClick.objects.create(
        vendor=equipment_item.vendor,
        listing_type=ListingClick.ListingType.EQUIPMENT,
        equipment_item=equipment_item,
        adventure_offering=None,
        user=user,
        **attrs,
    )


def record_adventure_listing_click(request, adventure_offering) -> ListingClick:
    attrs = extract_attribution_from_request(request)
    user = request.user if getattr(request, "user", None) and request.user.is_authenticated else None
    return ListingClick.objects.create(
        vendor=adventure_offering.vendor,
        listing_type=ListingClick.ListingType.ADVENTURE,
        equipment_item=None,
        adventure_offering=adventure_offering,
        user=user,
        **attrs,
    )


def record_listing_click_from_payload(
    *,
    listing_type: str,
    equipment_item=None,
    adventure_offering=None,
    utm_source: str = "",
    utm_medium: str = "",
    utm_campaign: str = "",
    utm_term: str = "",
    utm_content: str = "",
    gclid: str = "",
    fbclid: str = "",
    referrer: str = "",
    user=None,
) -> ListingClick:
    traffic_type = classify_traffic(
        utm_source=utm_source or "",
        utm_medium=utm_medium or "",
        utm_campaign=utm_campaign or "",
        utm_term=utm_term or "",
        utm_content=utm_content or "",
        gclid=gclid or "",
        fbclid=fbclid or "",
    )
    if listing_type == ListingClick.ListingType.EQUIPMENT:
        return ListingClick.objects.create(
            vendor=equipment_item.vendor,
            listing_type=ListingClick.ListingType.EQUIPMENT,
            equipment_item=equipment_item,
            adventure_offering=None,
            traffic_type=traffic_type,
            utm_source=utm_source[:255],
            utm_medium=utm_medium[:255],
            utm_campaign=utm_campaign[:255],
            utm_term=utm_term[:255],
            utm_content=utm_content[:255],
            gclid=gclid[:255],
            fbclid=fbclid[:255],
            referrer=referrer[:2048],
            user=user,
        )
    return ListingClick.objects.create(
        vendor=adventure_offering.vendor,
        listing_type=ListingClick.ListingType.ADVENTURE,
        equipment_item=None,
        adventure_offering=adventure_offering,
        traffic_type=traffic_type,
        utm_source=utm_source[:255],
        utm_medium=utm_medium[:255],
        utm_campaign=utm_campaign[:255],
        utm_term=utm_term[:255],
        utm_content=utm_content[:255],
        gclid=gclid[:255],
        fbclid=fbclid[:255],
        referrer=referrer[:2048],
        user=user,
    )


ATTRIBUTION_MAX_AGE_DAYS = 90


def listing_click_valid_for_booking(*, click, equipment_item=None, adventure_offering=None) -> bool:
    if click is None:
        return False
    cutoff = timezone.now() - timedelta(days=ATTRIBUTION_MAX_AGE_DAYS)
    if click.created_at < cutoff:
        return False
    if equipment_item is not None:
        return (
            click.listing_type == ListingClick.ListingType.EQUIPMENT
            and click.equipment_item_id == equipment_item.id
            and click.vendor_id == equipment_item.vendor_id
        )
    if adventure_offering is not None:
        return (
            click.listing_type == ListingClick.ListingType.ADVENTURE
            and click.adventure_offering_id == adventure_offering.id
            and click.vendor_id == adventure_offering.vendor_id
        )
    return False