"""국가 GIS 벡터 데이터 다운로드 엔진."""

from __future__ import annotations

import json
import urllib.parse
import urllib.request
from pathlib import Path

from pyproj import Transformer

# 설정 불러오기
try:
    from config import config_system

    VWORLD_API_KEY = getattr(
        config_system, "VWORLD_API_KEY", "3DBD7306-7DBD-38BB-B292-267C5ED7AC6B"
    )
    PROJECT_ROOT = getattr(config_system, "PROJECT_ROOT", Path(__file__).resolve().parent.parent)
except ImportError:
    VWORLD_API_KEY = "3DBD7306-7DBD-38BB-B292-267C5ED7AC6B"
    PROJECT_ROOT = Path(__file__).resolve().parent.parent

from B04_wf1_Surface.B04_wf1_Surface_Engine_VWorld import get_epsg_from_prj


def request_vworld_wfs(typename: str, filename: str, bounds_wgs84: dict, output_dir: Path) -> None:
    """브이월드 WFS API를 사용하여 지정된 Bounds 영역 내의
    공간 벡터 데이터를 GeoJSON으로 다운로드합니다.
    """
    # 4326(위경도) bbox 파라미터 구성 (BBOX=minx,miny,maxx,maxy)
    bbox_str = (
        f"{bounds_wgs84['min_lon']},{bounds_wgs84['min_lat']},"
        f"{bounds_wgs84['max_lon']},{bounds_wgs84['max_lat']}"
    )

    # WFS 파라미터 조립
    params = {
        "key": VWORLD_API_KEY,
        "domain": "localhost",
        "service": "WFS",
        "version": "1.1.0",
        "request": "GetFeature",
        "typename": typename,
        "bbox": bbox_str,
        "output": "application/json",  # GeoJSON 포맷 요청
        "srsName": "EPSG:4326",
    }

    url = "http://api.vworld.kr/req/wfs?" + urllib.parse.urlencode(params)
    headers = {"User-Agent": "Mozilla/5.0"}

    req = urllib.request.Request(url, headers=headers)
    try:
        with urllib.request.urlopen(req, timeout=15) as res:
            content = res.read()

        data = json.loads(content.decode("utf-8"))

        output_path = output_dir / filename
        output_path.write_text(json.dumps(data, indent=2, ensure_ascii=False), encoding="utf-8")
    except Exception:
        pass


def download_all_gis_vectors(prj_path: Path, bounds_meter: dict, output_dir: Path) -> None:
    """지형의 로컬 미터단위 bounds 정보를 위경도로 변환 후 5대 국가 GIS 데이터를 다운로드합니다."""
    output_dir.mkdir(parents=True, exist_ok=True)

    # 1. vworld_white_meta.json이 생성되어 있다면 직접 위경도 경계 획득하여 pyproj 축왜곡 방지
    meta_path = prj_path.parent / "vworld_white_meta.json"
    if not meta_path.exists():
        meta_path = prj_path.parent / "vworld_satellite_meta.json"

    if meta_path.exists():
        try:
            with open(meta_path, "r", encoding="utf-8") as f:
                meta_data = json.load(f)
            bounds_wgs84 = {
                "min_lon": meta_data["lon_min"] - 0.010,
                "max_lon": meta_data["lon_max"] + 0.010,
                "min_lat": meta_data["lat_min"] - 0.010,
                "max_lat": meta_data["lat_max"] + 0.010,
            }
        except Exception:
            # 폴백용 pyproj 변환
            src_epsg = "EPSG:5186"
            if prj_path.exists():
                src_epsg = get_epsg_from_prj(prj_path.read_text(encoding="utf-8", errors="ignore"))
            transformer = Transformer.from_crs(src_epsg, "EPSG:4326", always_xy=True)
            x_min, x_max = bounds_meter["x"][0], bounds_meter["x"][1]
            y_min, y_max = bounds_meter["y"][0], bounds_meter["y"][1]
            lon_min, lat_min = transformer.transform(x_min, y_min)
            lon_max, lat_max = transformer.transform(x_max, y_max)
            bounds_wgs84 = {
                "min_lon": min(lon_min, lon_max) - 0.002,
                "max_lon": max(lon_min, lon_max) + 0.002,
                "min_lat": min(lat_min, lat_max) - 0.002,
                "max_lat": max(lat_min, lat_max) + 0.002,
            }
    else:
        # 폴백용 pyproj 변환
        src_epsg = "EPSG:5186"
        if prj_path.exists():
            src_epsg = get_epsg_from_prj(prj_path.read_text(encoding="utf-8", errors="ignore"))
        transformer = Transformer.from_crs(src_epsg, "EPSG:4326", always_xy=True)
        x_min, x_max = bounds_meter["x"][0], bounds_meter["x"][1]
        y_min, y_max = bounds_meter["y"][0], bounds_meter["y"][1]
        lon_min, lat_min = transformer.transform(x_min, y_min)
        lon_max, lat_max = transformer.transform(x_max, y_max)
        bounds_wgs84 = {
            "min_lon": min(lon_min, lon_max) - 0.010,
            "max_lon": max(lon_min, lon_max) + 0.010,
            "min_lat": min(lat_min, lat_max) - 0.010,
            "max_lat": max(lat_min, lat_max) + 0.010,
        }

    # 5대 레이어 다운로드
    request_vworld_wfs(
        "lt_c_landinfobasemap", "연속지적도_bounds.geojson", bounds_wgs84, output_dir
    )
    request_vworld_wfs("lt_c_uq111", "용도지역도_bounds.geojson", bounds_wgs84, output_dir)
    request_vworld_wfs("lt_c_adsigg", "행정구역_시군구_bounds.geojson", bounds_wgs84, output_dir)
    request_vworld_wfs("lt_c_adri", "행정구역_읍면동_bounds.geojson", bounds_wgs84, output_dir)
    request_vworld_wfs("lt_c_gimshydro", "수계망_물줄기_bounds.geojson", bounds_wgs84, output_dir)
    request_vworld_wfs(
        "lt_c_kfdrssigugrade", "산사태위험등급_bounds.geojson", bounds_wgs84, output_dir
    )

    # 6. gpkg 등고선(national_contours.gpkg) 데이터에서
    # 기준 영역 크롭하여 등고선_bounds.geojson 생성

    gpkg_path = PROJECT_ROOT / "source" / "grobal_contours" / "national_contours.gpkg"
    if gpkg_path.exists():
        try:
            import geopandas as gpd
            from shapely.geometry import box

            t_to_5179 = Transformer.from_crs("EPSG:4326", "EPSG:5179", always_xy=True)
            min_x_5179, min_y_5179 = t_to_5179.transform(
                bounds_wgs84["min_lon"], bounds_wgs84["min_lat"]
            )
            max_x_5179, max_y_5179 = t_to_5179.transform(
                bounds_wgs84["max_lon"], bounds_wgs84["max_lat"]
            )

            bbox = box(min_x_5179, min_y_5179, max_x_5179, max_y_5179)

            gdf = gpd.read_file(gpkg_path, bbox=bbox)
            if not gdf.empty:
                gdf_wgs84 = gdf.to_crs("EPSG:4326")
                geojson_out = output_dir / "등고선_bounds.geojson"
                gdf_wgs84.to_file(geojson_out, driver="GeoJSON")
        except Exception:
            pass