"""Run a whole HDevelop program (.hdev) via HDevEngine and read control vars back.

Use when the logic lives in a program's main rather than a parameterized
procedure. Outputs print as a JSON object on stdout.

Example:
    /mnt/c/Users/NAURA/.local/bin/uv.exe run python \
        .claude/skills/halcon/scripts/run_program.py \
        --program C:/workspace/agent-studio/halcon-001/demo_prog.hdev \
        --get Total --get Area --get Message

Notes:
  - The program must be self-contained and non-interactive (no draw_*, no stop()).
  - Use ABSOLUTE paths inside the program (no cwd notion under HDevEngine).
"""
import argparse
import json
import sys

from _common import jsonable


def main() -> int:
    ap = argparse.ArgumentParser(description="Run a HALCON .hdev via HDevEngine")
    ap.add_argument("--program", required=True, help="Absolute path to the .hdev")
    ap.add_argument("--get", dest="gets", action="append", default=[],
                    metavar="Name", help="Control variable to read (repeatable)")
    args = ap.parse_args()

    try:
        from halcon.hdevengine import HDevProgram, HDevProgramCall, HDevEngineError
    except Exception as e:
        print(f"ERROR: cannot import HDevEngine ({e}). Run via the project venv "
              f"using uv.", file=sys.stderr)
        return 1

    program = HDevProgram(args.program)
    call = HDevProgramCall(program)
    try:
        call.execute()
    except HDevEngineError as e:
        print(json.dumps({"ok": False, "error": str(e)}, ensure_ascii=False))
        return 3

    out = {}
    for name in args.gets:
        try:
            out[name] = jsonable(call.get_control_var_by_name(name))
        except HDevEngineError as e:
            out[name] = {"error": str(e)}
    print(json.dumps({"ok": True, "vars": out}, ensure_ascii=False))
    return 0


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