#!/usr/bin/env python3
"""
CoordConverter CLI — standalone command-line interface.
"""
import argparse
import sys
import os

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from converter.workflow import ConversionWorkflow
from core.coord_transform import CoordTransformer


def build_parser() -> argparse.ArgumentParser:
    p = argparse.ArgumentParser(prog="coord-converter", description="坐标转换工具")
    sub = p.add_subparsers(dest="command")

    # convert
    cp = sub.add_parser("convert", help="转换单个文件")
    cp.add_argument("input", help="输入文件路径")
    cp.add_argument("-o", "--output", required=True, help="输出文件路径")
    cp.add_argument("--from-crs", default="auto", help="源坐标系 EPSG (默认 auto)")
    cp.add_argument("--to-crs", default="EPSG:4490", help="目标坐标系 EPSG (默认 CGCS2000)")
    cp.add_argument("--output-format", default="auto", help="强制输出格式")

    # list-crs
    lp = sub.add_parser("list-crs", help="列出支持的坐标系")
    return p


def main():
    parser = build_parser()
    args = parser.parse_args()

    if args.command == "convert":
        wf = ConversionWorkflow()
        result = wf.run(
            input_path=args.input,
            output_path=args.output,
            from_crs=args.from_crs if args.from_crs != "auto" else None,
            to_crs=args.to_crs,
            output_format=args.output_format,
        )
        print(f"✅ 转换完成: {result['output']}")
        print(f"   记录数: {result['feature_count']}")
        print(f"   坐标系: {result['crs']}")

    elif args.command == "list-crs":
        for crs in CoordTransformer.list_supported():
            print(f"  {crs['name']:16s}  {crs['epsg']:12s}  {crs['desc']}")
    else:
        parser.print_help()


if __name__ == "__main__":
    main()