import json
import os
import sys
import urllib.error
import urllib.request


def _http_json(method: str, url: str, body: dict | None = None, headers: dict | None = None, timeout: int = 60):
    data = None
    if body is not None:
        data = json.dumps(body).encode("utf-8")

    req = urllib.request.Request(url=url, data=data, method=method)
    req.add_header("Content-Type", "application/json")

    if headers:
        for k, v in headers.items():
            if v is not None and v != "":
                req.add_header(k, v)

    try:
        with urllib.request.urlopen(req, timeout=timeout) as resp:
            raw = resp.read().decode("utf-8")
            if not raw:
                return resp.status, None
            return resp.status, json.loads(raw)
    except urllib.error.HTTPError as e:
        raw = e.read().decode("utf-8") if e.fp else ""
        try:
            parsed = json.loads(raw) if raw else {"detail": raw}
        except Exception:
            parsed = {"detail": raw}
        return e.code, parsed


def _assert(cond: bool, msg: str):
    if not cond:
        raise AssertionError(msg)


def _validate_visualization(vis: dict):
    _assert(isinstance(vis, dict), "visualization must be an object")
    _assert("type" in vis and isinstance(vis["type"], str), "visualization.type must be a string")
    _assert(vis["type"] in {"bar", "line", "area", "pie", "table", "report"}, "visualization.type invalid")
    _assert("title" in vis and isinstance(vis["title"], str), "visualization.title must be a string")

    if "data" in vis and vis["data"] is not None:
        _assert(isinstance(vis["data"], list), "visualization.data must be a list")

    if "xAxisKey" in vis and vis["xAxisKey"] is not None:
        _assert(isinstance(vis["xAxisKey"], str), "visualization.xAxisKey must be a string")

    if "series" in vis and vis["series"] is not None:
        _assert(isinstance(vis["series"], list), "visualization.series must be a list")
        for s in vis["series"]:
            _assert(isinstance(s, dict), "series item must be an object")
            _assert(isinstance(s.get("dataKey"), str), "series.dataKey must be a string")
            _assert(isinstance(s.get("name"), str), "series.name must be a string")
            _assert(isinstance(s.get("color"), str), "series.color must be a string")

    if "columns" in vis and vis["columns"] is not None:
        _assert(isinstance(vis["columns"], list), "visualization.columns must be a list")
        for c in vis["columns"]:
            _assert(isinstance(c, dict), "column item must be an object")
            _assert(isinstance(c.get("key"), str), "column.key must be a string")
            _assert(isinstance(c.get("label"), str), "column.label must be a string")

    if "insights" in vis and vis["insights"] is not None:
        _assert(isinstance(vis["insights"], list), "visualization.insights must be a list")
        for i in vis["insights"]:
            _assert(isinstance(i, str), "insights items must be strings")


def _validate_response(resp: dict):
    _assert(isinstance(resp, dict), "Response must be a JSON object")
    _assert("answer" in resp and isinstance(resp["answer"], str), "Response.answer must be a string")
    _assert("visualization" in resp, "Response.visualization must exist (can be null)")
    if resp["visualization"] is not None:
        _validate_visualization(resp["visualization"])


def main():
    base_url = os.environ.get("BASE_URL") or (sys.argv[1] if len(sys.argv) > 1 else "").strip()
    if not base_url:
        print("Usage: python test.py <BASE_URL>  OR set BASE_URL env var")
        print("Example: python test.py https://your-space-name.hf.space")
        sys.exit(2)

    base_url = base_url.rstrip("/")

    api_key = os.environ.get("BACKEND_API_KEY", "")
    headers = {}
    if api_key:
        headers["X-API-Key"] = api_key

    print(f"BASE_URL = {base_url}")

    # 1) Health
    status, health = _http_json("GET", f"{base_url}/health", headers=headers)
    print(f"/health -> {status}")
    print(json.dumps(health, indent=2, ensure_ascii=False))

    # 2) Prompts aligned with frontend mock use-cases
    prompts = [
        "Show me the water level trend for Koyna in May 2025",
        "List top 10 dams by live_storage",
        "Give me a pie distribution of dams by storage bands",
    ]

    for idx, prompt in enumerate(prompts, start=1):
        payload = {"prompt": prompt, "context": {"page": "reports"}}
        status, resp = _http_json("POST", f"{base_url}/api/ai/query", body=payload, headers=headers)
        print("\n" + "=" * 80)
        print(f"Test #{idx}: {prompt}")
        print(f"/api/ai/query -> {status}")
        print(json.dumps(resp, indent=2, ensure_ascii=False))

        if status == 200:
            _validate_response(resp)
            print("Contract: OK")
        else:
            print("Contract: SKIPPED (non-200)")

    print("\nDone.")


if __name__ == "__main__":
    main()