"""Main blueprint: landing page, health check, SEO files."""
from datetime import datetime
from flask import Blueprint, render_template, jsonify, Response, request

main_bp = Blueprint("main", __name__)


@main_bp.route("/")
def index():
    return render_template("index.html")


@main_bp.route("/healthz")
def healthz():
    return jsonify(status="ok")


@main_bp.route("/robots.txt")
def robots():
    lines = [
        "User-agent: *",
        "Disallow: /admin",
        "Disallow: /auth/",
        "Disallow: /my/",
        "Disallow: /messages",
        "Disallow: /billing/",
        f"Sitemap: {request.host_url}sitemap.xml",
    ]
    return Response("\n".join(lines), mimetype="text/plain")


@main_bp.route("/sitemap.xml")
def sitemap():
    from app.extensions import db
    from app.models.listing import Listing
    from app.models.category import Category
    from app.models.enums import ListingStatus

    base = request.host_url.rstrip("/")
    urls = []

    # static pages
    for path in ("", "/listings", "/pricing", "/sponsors"):
        urls.append({"loc": f"{base}{path}", "changefreq": "daily", "priority": "0.8"})

    # categories
    for cat in Category.query.filter_by(is_active=True).all():
        urls.append({
            "loc": f"{base}/listings?category={cat.id}",
            "changefreq": "daily",
            "priority": "0.7",
        })

    # active listings (last 500 by bump/created for crawl budget)
    listings = (Listing.query
                .filter(Listing.status == ListingStatus.active,
                        Listing.expires_at > datetime.utcnow())
                .order_by(Listing.created_at.desc())
                .limit(500).all())
    for l in listings:
        urls.append({
            "loc": f"{base}/listings/{l.id}",
            "lastmod": l.updated_at.strftime("%Y-%m-%d"),
            "changefreq": "weekly",
            "priority": "0.6",
        })

    xml = render_template("sitemap.xml", urls=urls)
    return Response(xml, mimetype="application/xml")


# ---------------------------------------------------------------------------
# SEO landing pages
# ---------------------------------------------------------------------------
@main_bp.route("/classifieds/category/<slug>")
def category_landing(slug):
    from app.extensions import db
    from app.models.category import Category
    from app.models.listing import Listing
    from app.models.enums import ListingStatus
    cat = Category.query.filter_by(slug=slug, is_active=True).first_or_404()
    listings = (Listing.query
                .filter(Listing.category_id == cat.id,
                        Listing.status == ListingStatus.active,
                        Listing.expires_at > datetime.utcnow())
                .order_by(Listing.created_at.desc())
                .limit(20).all())
    return render_template("main/category_landing.html", cat=cat, listings=listings)


@main_bp.route("/classifieds/state/<state>")
def state_landing(state):
    from app.extensions import db
    from app.models.listing import Listing
    from app.models.enums import ListingStatus
    state = state.upper()
    listings = (Listing.query
                .filter(Listing.state == state,
                        Listing.status == ListingStatus.active,
                        Listing.expires_at > datetime.utcnow())
                .order_by(Listing.created_at.desc())
                .limit(20).all())
    return render_template("main/state_landing.html", state=state, listings=listings)