#!/usr/bin/env python3
"""
PSN.cz scraper.
Stáhne byty na prodej z API /api/units-list — jeden požadavek, žádné stránkování.
Výstup: byty_psn.json
"""
from __future__ import annotations

import argparse
import json
import logging
import re
import subprocess
import time
from datetime import datetime
from pathlib import Path
from urllib.parse import urlencode

logger = logging.getLogger(__name__)

# ── Konfigurace ─────────────────────────────────────────────────────────────

MAX_PRICE = 14_000_000
MIN_AREA = 69
MIN_FLOOR = 2

WANTED_DISPOSITIONS = {"3+kk", "3+1", "4+kk", "4+1", "5+kk", "5+1", "6+kk", "6+1", "5+kk a větší"}

# Pouze Praha — ostatní města (Brno, Pardubice, Špindlerův Mlýn) přeskočit
WANTED_CITIES = {"Praha"}

UA = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"

BASE_URL = "https://psn.cz"
UNITS_API = f"{BASE_URL}/api/units-list"


def fetch_json(url: str) -> dict:
    """Fetch JSON via curl (urllib SSL may fail on Cloudflare)."""
    logger.debug(f"HTTP GET: {url}")
    result = subprocess.run(
        ["curl", "-s", "-L", "--max-time", "30",
         "-H", f"User-Agent: {UA}",
         "-H", "Accept: application/json",
         url],
        capture_output=True, text=True, timeout=60
    )
    if result.returncode != 0:
        raise RuntimeError(f"curl failed ({result.returncode}): {result.stderr[:200]}")
    return json.loads(result.stdout)


def fix_gps(lat, lng):
    """PSN má u některých projektů prohozené lat/lng — opravíme."""
    if lat is not None and lng is not None and lat < 20 and lng > 20:
        return lng, lat
    return lat, lng


def format_price(price: int) -> str:
    s = str(price)
    parts = []
    while s:
        parts.append(s[-3:])
        s = s[:-3]
    return " ".join(reversed(parts)) + " Kč"


def scrape(max_properties: int | None = None):
    logger.info("=" * 60)
    logger.info("Stahuji inzeráty z PSN.cz")
    logger.info(f"Cena: do {format_price(MAX_PRICE)}")
    logger.info(f"Min. plocha: {MIN_AREA} m²")
    logger.info(f"Patro: od {MIN_FLOOR}. NP")
    logger.info(f"Region: Praha")
    if max_properties:
        logger.info(f"Max. bytů: {max_properties}")
    logger.info("=" * 60)

    # Jediný API požadavek — vrátí všechny jednotky (cca 236)
    params = urlencode({
        "locale": "cs",
        "filters": "{}",
        "type": "list",
        "order": "price-asc",
        "offset": 0,
        "limit": 500,
    })
    url = f"{UNITS_API}?{params}"
    logger.info("Stahuji jednotky z API ...")

    try:
        data = fetch_json(url)
    except Exception as e:
        logger.error(f"Chyba při stahování: {e}", exc_info=True)
        return []

    all_units = data.get("units", {}).get("data", [])
    logger.info(f"Staženo jednotek celkem: {len(all_units)}")

    # Filtrování
    results = []
    excluded = {
        "prodáno": 0,
        "typ": 0,
        "město": 0,
        "dispozice": 0,
        "cena": 0,
        "plocha": 0,
        "patro": 0,
    }
    properties_fetched = 0

    for unit in all_units:
        if max_properties and properties_fetched >= max_properties:
            break

        unit_id = unit.get("id", "?")

        # Pouze prodej bytů (type_id=0)
        if unit.get("type_id") != 0:
            excluded["typ"] += 1
            logger.debug(f"id={unit_id}: přeskočen (type_id={unit.get('type_id')}, není prodej bytu)")
            continue

        # Pouze volné (ne rezervované, prodané, v přípravě)
        sale_status = unit.get("sale_status", "")
        is_free = unit.get("is_free", False)
        is_sold = unit.get("is_sold", False)
        if is_sold or not is_free:
            excluded["prodáno"] += 1
            logger.debug(f"id={unit_id}: přeskočen (status={sale_status})")
            continue

        # Pouze Praha
        city = (unit.get("location") or unit.get("address", {}).get("city") or "").strip()
        # location field je typicky "Praha 4", "Praha 7" atd.
        city_base = city.split(" ")[0] if city else ""
        if city_base not in WANTED_CITIES:
            excluded["město"] += 1
            logger.debug(f"id={unit_id}: přeskočen (město={city})")
            continue

        # Dispozice
        disp = unit.get("disposition", "")
        if disp not in WANTED_DISPOSITIONS:
            excluded["dispozice"] += 1
            logger.debug(f"id={unit_id}: přeskočen (dispozice={disp})")
            continue

        # Cena
        price = unit.get("action_price_czk") or unit.get("price_czk") or 0
        if not price or price <= 0 or price > MAX_PRICE:
            excluded["cena"] += 1
            logger.debug(f"id={unit_id}: přeskočen (cena={price})")
            continue

        # Plocha
        area = unit.get("total_area") or unit.get("floor_area") or 0
        if area < MIN_AREA:
            excluded["plocha"] += 1
            logger.debug(f"id={unit_id}: přeskočen (plocha={area} m²)")
            continue

        # Patro
        floor_str = str(unit.get("floor", ""))
        floor = None
        if floor_str:
            try:
                floor = int(floor_str)
            except ValueError:
                m = re.search(r'(-?\d+)', floor_str)
                if m:
                    floor = int(m.group(1))

        if floor is not None and floor < MIN_FLOOR:
            excluded["patro"] += 1
            logger.debug(f"id={unit_id}: přeskočen (patro={floor})")
            continue

        # GPS — opravit prohozené souřadnice
        lat_raw = unit.get("latitude")
        lng_raw = unit.get("longitude")
        lat, lng = fix_gps(lat_raw, lng_raw)
        if not lat or not lng:
            logger.warning(f"id={unit_id}: chybí GPS souřadnice, přeskakuji")
            continue

        # Sestavit adresu pro locality
        addr = unit.get("address") or {}
        street = addr.get("street", "")
        street_no = addr.get("street_no", "")
        if street and street_no:
            locality_str = f"{street} {street_no}, {city}"
        elif street:
            locality_str = f"{street}, {city}"
        else:
            project_name = unit.get("project", "")
            locality_str = f"{project_name}, {city}" if project_name else city

        # URL na detail jednotky
        unit_slug = unit.get("slug", "")
        project_slug = ""
        # project_slug lze odvodit z projektu nebo z reference_no
        # API nevrací project_slug přímo — použijeme reference_no nebo jen ID
        reference_no = unit.get("reference_no", "")
        if unit_slug:
            detail_url = f"{BASE_URL}/prodej/{unit_slug}"
        elif reference_no:
            detail_url = f"{BASE_URL}/prodej/{reference_no}"
        else:
            detail_url = BASE_URL

        result = {
            "hash_id": str(unit_id),
            "name": f"Prodej bytu {disp}, {int(area)} m² — {unit.get('project', locality_str)}",
            "price": int(price),
            "price_formatted": format_price(int(price)),
            "locality": locality_str,
            "lat": lat,
            "lon": lng,
            "disposition": disp,
            "floor": floor,
            "area": float(area),
            "building_type": "neuvedeno",
            "ownership": "osobní",
            "url": detail_url,
            "source": "psn",
            "image": "",
            "scraped_at": datetime.now().strftime("%Y-%m-%d"),
        }
        results.append(result)
        properties_fetched += 1

    logger.info(f"\n{'=' * 60}")
    logger.info(f"Výsledky PSN:")
    logger.info(f"  Staženo jednotek:      {len(all_units)}")
    for reason, count in excluded.items():
        if count:
            logger.info(f"  Vyloučeno ({reason}): {count}")
    logger.info(f"  ✓ Vyhovující byty:    {len(results)}")
    logger.info(f"{'=' * 60}")

    return results


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Scrape apartments from PSN.cz")
    parser.add_argument("--max-properties", type=int, default=None,
                        help="Maximum number of properties to include in results")
    parser.add_argument("--log-level", type=str, default="INFO",
                        choices=["DEBUG", "INFO", "WARNING", "ERROR"],
                        help="Logging level (default: INFO)")
    args = parser.parse_args()

    logging.basicConfig(
        level=getattr(logging, args.log_level),
        format="[%(levelname)s] %(asctime)s - %(name)s - %(message)s",
        handlers=[logging.StreamHandler()]
    )

    start = time.time()
    estates = scrape(max_properties=args.max_properties)

    if estates:
        json_path = Path("byty_psn.json")
        json_path.write_text(
            json.dumps(estates, ensure_ascii=False, indent=2),
            encoding="utf-8",
        )
        elapsed = time.time() - start
        logger.info(f"\n✓ Data uložena: {json_path.resolve()}")
        logger.info(f"⏱  Celkový čas: {elapsed:.1f} s")
    else:
        logger.info("\nŽádné byty z PSN neodpovídají kritériím :(")