#!/usr/bin/env python3
"""
NavSea port overlay export v1.0

从九州工程库快照导出港湾/渔港叠加预览资产：
- 港湾 AOI 面
- 港湾 AOI 中心点
- 元数据清单

用途：
- 在 MapLibre 中快速检查港湾、渔港、小港湾的覆盖范围
- 作为后续港湾语义栅格化的人工核查层
"""

from __future__ import annotations

import argparse
import json
import math
import sqlite3
from pathlib import Path

from shapely.geometry import Point, Polygon, mapping


RADIUS = 6378137.0


def mercator_to_lonlat(x: float, y: float) -> tuple[float, float]:
    lon = math.degrees(x / RADIUS)
    lat = math.degrees(2.0 * math.atan(math.exp(y / RADIUS)) - math.pi / 2.0)
    return lon, lat


def polygon_to_lonlat(poly: Polygon) -> Polygon:
    exterior = [mercator_to_lonlat(x, y) for x, y in poly.exterior.coords]
    interiors = [
        [mercator_to_lonlat(x, y) for x, y in ring.coords]
        for ring in poly.interiors
    ]
    return Polygon(exterior, interiors)


def point_to_lonlat(point: Point) -> Point:
    lon, lat = mercator_to_lonlat(point.x, point.y)
    return Point(lon, lat)


def normalize_category(canonical_type: str) -> str:
    if canonical_type == "漁港":
        return "fishing_port"
    if canonical_type == "一般港湾 (港則法区域、重要港湾)":
        return "general_harbor"
    if canonical_type == "小港湾 (避難港、地方港湾)":
        return "small_harbor"
    return "unknown"


def style_color(category: str) -> str:
    if category == "fishing_port":
        return "#7fc8ff"
    if category == "general_harbor":
        return "#ffb86b"
    if category == "small_harbor":
        return "#b8d37a"
    return "#d9d9d9"


def main() -> None:
    parser = argparse.ArgumentParser(description="Export Kyushu port overlay assets")
    parser.add_argument(
        "--source-db",
        default="out/navsea_kyushu_navigability_full_run.export_snapshot.sqlite",
        help="输入 SQLite 快照",
    )
    parser.add_argument(
        "--output-dir",
        default="src/pbf/port-overlay/kyushu",
        help="输出目录",
    )
    parser.add_argument(
        "--slug",
        default="port_overlay_kyushu",
        help="输出文件前缀",
    )
    args = parser.parse_args()

    project_root = Path(__file__).resolve().parent.parent
    source_db = Path(args.source_db)
    if not source_db.is_absolute():
        source_db = project_root / source_db
    out_dir = Path(args.output_dir)
    if not out_dir.is_absolute():
        out_dir = project_root / out_dir
    out_dir.mkdir(parents=True, exist_ok=True)

    if not source_db.exists():
        raise SystemExit(f"missing source db: {source_db}")

    conn = sqlite3.connect(source_db)
    conn.row_factory = sqlite3.Row

    rows = conn.execute(
        """
        SELECT DISTINCT
          aoi_id, feature_id, fid, canonical_object_type, center_x, center_y, radius_m
        FROM port_aoi
        ORDER BY aoi_id
        """
    ).fetchall()

    if not rows:
        raise SystemExit("port_aoi is empty")

    radius_m = max(float(row["radius_m"]) for row in rows)
    types = {}
    minx = miny = float("inf")
    maxx = maxy = float("-inf")

    area_features = []
    center_features = []

    for row in rows:
        category = normalize_category(row["canonical_object_type"])
        color = style_color(category)
        center = Point(float(row["center_x"]), float(row["center_y"]))
        polygon = center.buffer(float(row["radius_m"]), resolution=16)

        minx = min(minx, float(row["center_x"]) - float(row["radius_m"]))
        miny = min(miny, float(row["center_y"]) - float(row["radius_m"]))
        maxx = max(maxx, float(row["center_x"]) + float(row["radius_m"]))
        maxy = max(maxy, float(row["center_y"]) + float(row["radius_m"]))

        types.setdefault(row["canonical_object_type"], 0)
        types[row["canonical_object_type"]] += 1

        area_features.append(
            {
                "type": "Feature",
                "properties": {
                    "aoi_id": row["aoi_id"],
                    "feature_id": row["feature_id"],
                    "fid": row["fid"],
                    "canonical_object_type": row["canonical_object_type"],
                    "category": category,
                    "radius_m": float(row["radius_m"]),
                    "fill": color,
                },
                "geometry": mapping(polygon_to_lonlat(polygon)),
            }
        )
        center_features.append(
            {
                "type": "Feature",
                "properties": {
                    "aoi_id": row["aoi_id"],
                    "feature_id": row["feature_id"],
                    "fid": row["fid"],
                    "canonical_object_type": row["canonical_object_type"],
                    "category": category,
                    "radius_m": float(row["radius_m"]),
                },
                "geometry": mapping(point_to_lonlat(center)),
            }
        )

    center_lonlat_min = mercator_to_lonlat(minx, miny)
    center_lonlat_max = mercator_to_lonlat(maxx, maxy)

    area_geojson = {
        "type": "FeatureCollection",
        "name": "port_overlay_areas",
        "features": area_features,
    }
    center_geojson = {
        "type": "FeatureCollection",
        "name": "port_overlay_centers",
        "features": center_features,
    }
    manifest = {
        "version": "v1.0",
        "source_db": str(source_db),
        "source_scope": "Kyushu",
        "total_features": len(rows),
        "radius_m": radius_m,
        "counts_by_type": types,
        "bbox_mercator": [minx, miny, maxx, maxy],
        "bbox_lonlat": [
            center_lonlat_min[0],
            center_lonlat_min[1],
            center_lonlat_max[0],
            center_lonlat_max[1],
        ],
        "area_file": f"{args.slug}_areas.geojson",
        "center_file": f"{args.slug}_centers.geojson",
    }

    (out_dir / f"{args.slug}_areas.geojson").write_text(
        json.dumps(area_geojson, ensure_ascii=False),
        encoding="utf-8",
    )
    (out_dir / f"{args.slug}_centers.geojson").write_text(
        json.dumps(center_geojson, ensure_ascii=False),
        encoding="utf-8",
    )
    (out_dir / f"{args.slug}_manifest.json").write_text(
        json.dumps(manifest, ensure_ascii=False, indent=2),
        encoding="utf-8",
    )
    conn.close()

    print("已导出:")
    print(" -", out_dir / f"{args.slug}_areas.geojson")
    print(" -", out_dir / f"{args.slug}_centers.geojson")
    print(" -", out_dir / f"{args.slug}_manifest.json")


if __name__ == "__main__":
    main()