import json
import os
import subprocess
import textwrap
from pathlib import Path

import pytest


@pytest.mark.core_model
@pytest.mark.benchmark
@pytest.mark.cpu
def test_bench_serve_cli_mocks_http_request(tmp_path: Path):
    num_prompts = 5
    port = 18000
    result_filename = "bench-result.json"
    calls_filename = "http-post-calls.json"
    result_path = tmp_path / result_filename
    calls_path = tmp_path / calls_filename

    sitecustomize_path = tmp_path / "sitecustomize.py"
    sitecustomize_path.write_text(
        textwrap.dedent(
            """
            import atexit
            import json
            import os

            POST_CALLS = []
            SSE_CHUNKS = [
                b'data: {"choices":[{"delta":{"content":"hi"}}],"modality":"text"}\\n\\n',
                b'data: {"choices":[{"delta":{"content":" there"}}],"modality":"text","metrics":{"num_tokens_out":4,"num_tokens_in":5}}\\n\\n',
                b"data: [DONE]\\n\\n",
            ]

            class _Content:
                def __init__(self, chunks):
                    self._chunks = chunks

                async def iter_any(self):
                    for chunk in self._chunks:
                        yield chunk

            class MockResponse:
                def __init__(self):
                    self.status = 200
                    self.reason = "OK"
                    self.content = _Content(SSE_CHUNKS)

                async def __aenter__(self):
                    return self

                async def __aexit__(self, exc_type, exc, tb):
                    return False

            class MockClientSession:
                def __init__(self, *args, **kwargs):
                    pass

                def post(self, url=None, *args, **kwargs):
                    if url is not None:
                        POST_CALLS.append(url)
                    return MockResponse()

                async def close(self):
                    return None

            import vllm_omni.benchmarks.patch.patch as patch_mod

            patch_mod.aiohttp.ClientSession = MockClientSession
            patch_mod.aiohttp.TCPConnector = lambda *args, **kwargs: object()

            calls_file = os.environ.get("VLLM_OMNI_TEST_POST_CALLS_FILE")

            if calls_file:
                def _write_calls():
                    with open(calls_file, "w", encoding="utf-8") as f:
                        json.dump({"requested_urls": POST_CALLS}, f)

                atexit.register(_write_calls)
            """
        ),
        encoding="utf-8",
    )

    env = os.environ.copy()
    env["PYTHONPATH"] = str(tmp_path) + os.pathsep + env.get("PYTHONPATH", "")
    env["VLLM_OMNI_TEST_POST_CALLS_FILE"] = str(calls_path)

    cmd = [
        "vllm",
        "bench",
        "serve",
        "--omni",
        "--model",
        "Qwen/Qwen2.5-Omni-7B",
        "--port",
        str(port),
        "--dataset-name",
        "random",
        "--random-input-len",
        "32",
        "--random-output-len",
        "4",
        "--num-prompts",
        str(num_prompts),
        "--endpoint",
        "/v1/chat/completions",
        "--backend",
        "openai-chat-omni",
        "--disable-tqdm",
        "--num-warmups",
        "0",
        "--ready-check-timeout-sec",
        "0",
        "--save-result",
        "--result-dir",
        str(tmp_path),
        "--result-filename",
        result_filename,
    ]
    proc = subprocess.run(
        cmd,
        cwd=str(Path(__file__).resolve().parents[2]),
        env=env,
        capture_output=True,
        text=True,
    )

    assert proc.returncode == 0, f"CLI failed: stdout={proc.stdout}\nstderr={proc.stderr}"
    print(f"CLI output: {proc.stdout}")
    assert result_path.exists()
    result = json.loads(result_path.read_text(encoding="utf-8"))
    assert calls_path.exists()
    calls = json.loads(calls_path.read_text(encoding="utf-8"))

    expected_url = f"http://127.0.0.1:{port}/v1/chat/completions"
    requested_urls = calls["requested_urls"]
    sent_requests = len(requested_urls)

    assert result["completed"] == sent_requests == num_prompts
    assert requested_urls
    assert all(url == expected_url for url in requested_urls), f"Unexpected target URLs: {requested_urls}"