import os
import sys
import types
import asyncio
import threading
from fastapi.testclient import TestClient


CURRENT_DIR = os.path.dirname(os.path.abspath(__file__))
BACKEND_DIR = os.path.abspath(os.path.join(CURRENT_DIR, ".."))
if BACKEND_DIR not in sys.path:
    sys.path.insert(0, BACKEND_DIR)

if "tts_asr" not in sys.modules:
    fake_tts_asr = types.ModuleType("tts_asr")
    fake_tts_asr.register_tts_asr_routes = lambda app: None
    sys.modules["tts_asr"] = fake_tts_asr

import main  # type: ignore
import pro_completions  # type: ignore


HEADERS = {"X-API-Key": main.API_KEY}


def _payload():
    return {
        "prefix": "Before",
        "suffix": "After",
        "languageId": "markdown",
        "instruction": "expand",
        "pro_thinking": "medium",
        "privacy_mode": True,
    }


def setup_function():
    pro_completions.PRO_STATES.clear()


def teardown_function():
    pro_completions.PRO_STATES.clear()


def test_pro_queue_full_returns_429(monkeypatch):
    monkeypatch.setattr(pro_completions, "PRO_QUEUE_MAX_SIZE", 0)
    client = TestClient(main.app)
    response = client.post("/v1/pro/completions", headers=HEADERS, json=_payload())
    assert response.status_code == 429
    assert response.json()["error"] == "PRO queue is full"


def test_pro_status_missing_returns_404():
    client = TestClient(main.app)
    response = client.get("/v1/pro/completions/status/missing", headers=HEADERS)
    assert response.status_code == 404


def test_pro_prompt_uses_pro_specific_instruction():
    system_prompt, user_prompt = pro_completions._build_pro_prompts(
        prefix="欢迎使用 LLM-IN-TEXT\n\n即时可用的 LLM 系统",
        suffix="",
        language_id="markdown",
        instruction="",
        pro_thinking="high",
    )
    combined = f"{system_prompt}\n{user_prompt}".lower()
    assert "[pro] model for llm-in-text" in combined
    assert "pro_mode: true" in combined
    assert "pro_thinking_level: high" in combined
    assert "long paragraphs or section-level output are allowed" in combined
    assert "highest priority" in combined
    assert "never copy tags to output" in combined
    assert "write only the markdown that belongs at the cursor" not in combined
    assert "continue the markdown naturally" in combined


def test_pro_cancel_waits_for_stream_cleanup(monkeypatch):
    started = threading.Event()
    cleaned = threading.Event()

    async def fake_stream_events(*args, **kwargs):
        started.set()
        try:
            yield "thinking", ""
            while True:
                await asyncio.sleep(0.05)
        finally:
            cleaned.set()

    monkeypatch.setattr(pro_completions, "stream_ollama_events", fake_stream_events)
    request_id = "pro-cancel-cleanup"
    headers = {**HEADERS, "X-Request-Id": request_id}
    response_box = {}

    with TestClient(main.app) as client:
        def send_stream():
            with client.stream("POST", "/v1/pro/completions", headers=headers, json=_payload()) as response:
                response_box["status_code"] = response.status_code
                response_box["body"] = "".join(response.iter_text())

        stream_thread = threading.Thread(target=send_stream, daemon=True)
        stream_thread.start()

        assert started.wait(timeout=2.0)
        cancel_response = client.post(
            "/v1/pro/completions/cancel",
            headers=HEADERS,
            json={"request_id": request_id, "reason": "test"},
        )

        assert cancel_response.status_code == 200
        assert cancel_response.json() == {"cancelled": True, "status": "ok"}
        assert cleaned.wait(timeout=2.0)

        stream_thread.join(timeout=5.0)
        assert not stream_thread.is_alive()