"""Debug: test --system flag with stdin."""
import asyncio, tempfile, os

async def test():
    # Write system prompt to temp file
    sys_file = tempfile.NamedTemporaryFile(mode="w", suffix=".md", delete=False, encoding="utf-8")
    sys_file.write("You are a planner. Respond with a JSON object containing: summary, tasks array.")
    sys_file.close()

    ctx = "List 2 tasks to improve a Python project. Respond in JSON format."
    
    print(f"System file: {sys_file.name}")
    print(f"Context length: {len(ctx)}")
    
    # Test 1: with --system
    proc = await asyncio.create_subprocess_exec(
        "cmd", "/c",
        f"gemini --system {sys_file.name} --approval-mode yolo",
        stdin=asyncio.subprocess.PIPE,
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.PIPE,
    )
    stdout, stderr = await asyncio.wait_for(
        proc.communicate(input=ctx.encode("utf-8")),
        timeout=90
    )
    
    out = stdout.decode('utf-8', errors='replace')
    err = stderr.decode('utf-8', errors='replace')
    
    lines = [l for l in out.splitlines() if "YOLO" not in l and "Loaded cached" not in l]
    print(f"\nSTDOUT ({len(out)} bytes): {out[:500]}")
    print(f"STDERR ({len(err)} bytes): {err[:500]}")
    print(f"CLEANED: {'|'.join(lines[:10])}")
    
    os.unlink(sys_file.name)

asyncio.run(test())