"""Automated smoke test for /health and /generate endpoints."""

from __future__ import annotations

import json
import os
import sys
import time

import requests
from dotenv import load_dotenv

load_dotenv()

BASE_URL = os.getenv("CODING_LLM_URL", "http://127.0.0.1:8000")
API_KEY = os.getenv("API_KEY", "")
TIMEOUT = int(os.getenv("SMOKE_TIMEOUT", "300"))
SKIP_GENERATE = os.getenv("SMOKE_SKIP_GENERATE", "false").lower() == "true"


def _headers() -> dict[str, str]:
    headers = {"Content-Type": "application/json"}
    if API_KEY:
        headers["x-api-key"] = API_KEY
    return headers


def wait_for_health() -> dict:
    candidate_urls = [BASE_URL]
    if "127.0.0.1" in BASE_URL:
        candidate_urls.append(BASE_URL.replace("127.0.0.1", "localhost"))
    elif "localhost" in BASE_URL:
        candidate_urls.append(BASE_URL.replace("localhost", "127.0.0.1"))

    deadline = time.time() + TIMEOUT
    last_errors: list[str] = []
    while time.time() < deadline:
        for url in candidate_urls:
            try:
                resp = requests.get(f"{url}/health", timeout=10)
                if resp.status_code == 200:
                    return resp.json()
                last_errors.append(f"{url}/health -> HTTP {resp.status_code}")
            except requests.RequestException as exc:
                last_errors.append(f"{url}/health -> {exc}")
        time.sleep(2)
    preview = "; ".join(last_errors[-5:]) if last_errors else "No response details captured."
    raise TimeoutError(f"Health check timeout. API did not become ready. Recent errors: {preview}")


def test_generate() -> dict:
    payload = {
        "instruction": "Fix this function and explain briefly",
        "input": "def add(a,b) return a+b",
    }
    resp = requests.post(
        f"{BASE_URL}/generate",
        headers=_headers(),
        json=payload,
        timeout=TIMEOUT,
    )
    if resp.status_code == 401:
        raise PermissionError(
            "Unauthorized (401). Set API_KEY in .env or environment before running smoke_test.py."
        )
    resp.raise_for_status()
    body = resp.json()

    required_keys = [
        "code",
        "explanation",
        "confidence",
        "important_tokens",
        "relevancy_score",
        "hallucination",
        "latency_ms",
    ]
    missing = [k for k in required_keys if k not in body]
    if missing:
        raise ValueError(f"Missing keys in /generate response: {missing}")
    return body


def main():
    print(f"[smoke] waiting for {BASE_URL}/health ...")
    health = wait_for_health()
    print("[smoke] health ok:", json.dumps(health))

    if SKIP_GENERATE:
        print("[smoke] skipping /generate (SMOKE_SKIP_GENERATE=true)")
        print("[smoke] SUCCESS")
        return

    print("[smoke] running /generate ... (first run may download model)")
    result = test_generate()
    print("[smoke] /generate ok")
    print(json.dumps(result, indent=2)[:2000])
    print("[smoke] SUCCESS")


if __name__ == "__main__":
    try:
        main()
    except Exception as exc:
        msg = str(exc)
        if "Read timed out" in msg:
            msg = (
                f"{msg}\nHint: model warmup is still running. "
                "Wait longer, increase SMOKE_TIMEOUT, or restart API with FORCE_MOCK_MODE=true for instant checks."
            )
        print(f"[smoke] FAILED: {msg}")
        sys.exit(1)