"""入口：python -m mcp_bridge [options]"""

import argparse
import json
import sys

from dwg_review import config

from . import __version__
from .server import StdioBridge


def build_parser():
    parser = argparse.ArgumentParser(
        prog="mcp_bridge",
        description="把标准 MCP 客户端（stdio）桥接到 CAD 基座（裸 TCP）。",
    )
    parser.add_argument("--host", default=None, help=f"CAD 基座主机（默认 {config.HOST}）")
    parser.add_argument("--port", type=int, default=None,
                        help=f"CAD 基座端口（默认 {config.PORT}）")
    parser.add_argument("--timeout", type=float, default=None,
                        help=f"单次调用超时秒数（默认 {config.CALL_TIMEOUT}）")
    parser.add_argument("--verbose", action="store_true", help="把诊断信息打到 stderr")
    parser.add_argument("--print-config", action="store_true",
                        help="打印可直接粘进 MCP 客户端的配置片段后退出")
    return parser


def print_config(args):
    host = args.host or config.HOST
    port = args.port if args.port is not None else config.PORT
    snippet = {
        "mcpServers": {
            "cad-autocad": {
                "command": sys.executable,
                "args": ["-m", "mcp_bridge"],
                "env": {
                    # 用绝对路径，避免依赖客户端的工作目录
                    "PYTHONPATH": str(config.PROJECT_ROOT),
                    "CAD_MCP_HOST": host,
                    "CAD_MCP_PORT": str(port),
                },
            }
        }
    }
    print(json.dumps(snippet, ensure_ascii=False, indent=2))
    return 0


def main(argv=None):
    args = build_parser().parse_args(argv)
    if args.print_config:
        return print_config(args)

    bridge = StdioBridge(
        host=args.host, port=args.port, timeout=args.timeout, verbose=args.verbose
    )
    if args.verbose:
        print(
            f"[mcp_bridge] v{__version__} 转发到 {bridge.host}:{bridge.port}，"
            f"单次超时 {bridge.timeout}s",
            file=sys.stderr, flush=True,
        )
    bridge.run()
    return 0


if __name__ == "__main__":
    sys.exit(main())