"""
backend/services/nemoclaw_client.py - NemoClaw inference client.

Production path:
  1. Shared SGLang / OpenAI-compatible coding runtime.

Compatibility:
  - Legacy NEMOCLAW_* env names are still honored.
  - Legacy OLLAMA_BASE_URL can still seed the base URL, but Ollama is no longer
    a production fallback path.
"""

from __future__ import annotations

import json
import logging
import os
import re
import time
from dataclasses import dataclass, field
from typing import Optional

import httpx

logger = logging.getLogger("velocity.nemoclaw")

NEMOCLAW_TIMEOUT = float(os.getenv("NEMOCLAW_TIMEOUT_S", "45.0"))
NEMOCLAW_TEMPERATURE = float(os.getenv("NEMOCLAW_TEMPERATURE", "0.2"))

SGLANG_BASE_URL = os.getenv(
    "SGLANG_BASE_URL",
    os.getenv(
        "NEMOCLAW_BASE_URL",
        os.getenv("LLM_BASE_URL", os.getenv("OLLAMA_BASE_URL", "https://llm.desineuron.in")),
    ),
).rstrip("/")
SGLANG_CHAT_URL = os.getenv(
    "SGLANG_CHAT_URL",
    os.getenv("NEMOCLAW_CHAT_URL", f"{SGLANG_BASE_URL}/v1/chat/completions"),
)
SGLANG_MODELS_URL = os.getenv("SGLANG_MODELS_URL", f"{SGLANG_BASE_URL}/v1/models")
SGLANG_MODEL = os.getenv(
    "SGLANG_MODEL",
    os.getenv("NEMOCLAW_MODEL", os.getenv("OLLAMA_MODEL", "qwen3.6:35b-a3b")),
)
SGLANG_API_TOKEN = os.getenv("SGLANG_API_TOKEN", os.getenv("NEMOCLAW_API_TOKEN", ""))

_PROMPT_DIR = os.getenv("NEMOCLAW_PROMPT_DIR", "/opt/dlami/nvme/nemoclaw/prompts")


def _load_system_prompt(name: str) -> str:
    local_fallback = os.path.join(
        os.path.dirname(__file__), "..", "nemoclaw_prompts", f"{name}.md"
    )
    for path in (os.path.join(_PROMPT_DIR, f"{name}.md"), local_fallback):
        try:
            with open(path, encoding="utf-8") as handle:
                return "\n".join(
                    line for line in handle.read().splitlines() if not line.startswith("#")
                ).strip()
        except FileNotFoundError:
            continue
    logger.warning("Prompt '%s' not found, using inline fallback.", name)
    return _PROMPTS.get(name, "")


_PROMPTS = {
    "qd_calculator": (
        "You are a behavioral intelligence analyst for a luxury real estate sales platform.\n"
        "Compute a Quantum Dynamics score between 1 and 100 using blend shapes, CRM context, "
        "and the active scene label when present.\n"
        'Respond with JSON only: {"qd_score": <int>, "reasoning": "<one sentence>", "confidence": <float>}'
    ),
    "lead_tagger": (
        "You are a lead intelligence analyst. Classify a real estate lead as HNI or NRI.\n"
        'Respond with JSON only: {"tags_to_add": [...], "tags_to_remove": []}'
    ),
    "cctv_profiler": (
        "You are a visitor profiling analyst for a luxury real estate development CCTV system.\n"
        'Respond with JSON only: {"wealth_indicator": "HNI"|"standard"|"unknown", '
        '"vehicle_class": "luxury"|"standard"|"unknown", "tags_to_add": [...], "notes": "<string>"}'
    ),
}


@dataclass
class QDResult:
    qd_score: int
    reasoning: str
    confidence: float


@dataclass
class TagResult:
    tags_to_add: list[str] = field(default_factory=list)
    tags_to_remove: list[str] = field(default_factory=list)


@dataclass
class CCTVProfileResult:
    wealth_indicator: str
    vehicle_class: str
    tags_to_add: list[str] = field(default_factory=list)
    notes: str = ""


async def _attempt_chat(
    *,
    label: str,
    url: str,
    model: str,
    system_content: str,
    user_content: str,
    timeout: float,
    headers: dict[str, str],
) -> dict:
    payload = {
        "model": model,
        "messages": [
            {"role": "system", "content": system_content},
            {"role": "user", "content": user_content},
        ],
        "temperature": NEMOCLAW_TEMPERATURE,
        "response_format": {"type": "json_object"},
        "max_tokens": 1024,
    }
    async with httpx.AsyncClient(timeout=timeout) as client:
        response = await client.post(url, json=payload, headers=headers)
        response.raise_for_status()
    body = response.json()
    raw_content = body["choices"][0]["message"]["content"]
    logger.debug("NemoClaw response via %s: %s", label, raw_content[:200])
    return _parse_model_response(raw_content)


def _extract_text(raw_content: object) -> str:
    if isinstance(raw_content, str):
        return raw_content
    if isinstance(raw_content, list):
        parts: list[str] = []
        for item in raw_content:
            if isinstance(item, dict):
                text = item.get("text")
                if isinstance(text, str):
                    parts.append(text)
        return "\n".join(parts).strip()
    return str(raw_content)


def _parse_model_response(raw_content: object) -> dict:
    text = _extract_text(raw_content).strip()
    if not text:
        return {}
    try:
        return json.loads(text)
    except json.JSONDecodeError:
        start = text.find("{")
        end = text.rfind("}")
        if start != -1 and end != -1 and end > start:
            candidate = text[start : end + 1]
            try:
                return json.loads(candidate)
            except json.JSONDecodeError:
                pass

    parsed: dict[str, object] = {}
    int_match = re.search(r'"qd_score"\s*:\s*(\d+)', text)
    if int_match:
        parsed["qd_score"] = int(int_match.group(1))
    conf_match = re.search(r'"confidence"\s*:\s*([0-9]*\.?[0-9]+)', text)
    if conf_match:
        parsed["confidence"] = float(conf_match.group(1))
    reason_match = re.search(r'"reasoning"\s*:\s*"([^"]*)"', text)
    if reason_match:
        parsed["reasoning"] = reason_match.group(1)
    wealth_match = re.search(r'"wealth_indicator"\s*:\s*"([^"]*)"', text)
    if wealth_match:
        parsed["wealth_indicator"] = wealth_match.group(1)
    vehicle_match = re.search(r'"vehicle_class"\s*:\s*"([^"]*)"', text)
    if vehicle_match:
        parsed["vehicle_class"] = vehicle_match.group(1)
    notes_match = re.search(r'"notes"\s*:\s*"([^"]*)"', text)
    if notes_match:
        parsed["notes"] = notes_match.group(1)
    tags_match = re.search(r'"tags_to_add"\s*:\s*\[(.*?)\]', text, flags=re.S)
    if tags_match:
        parsed["tags_to_add"] = re.findall(r'"([^"]+)"', tags_match.group(1))
    remove_tags_match = re.search(r'"tags_to_remove"\s*:\s*\[(.*?)\]', text, flags=re.S)
    if remove_tags_match:
        parsed["tags_to_remove"] = re.findall(r'"([^"]+)"', remove_tags_match.group(1))
    if parsed:
        logger.warning("Recovered partial NemoClaw JSON payload from malformed model output.")
        return parsed
    raise json.JSONDecodeError("Unable to parse model JSON", text, 0)


async def _nemoclaw_chat(
    system_content: str,
    user_content: str,
    timeout: float = NEMOCLAW_TIMEOUT,
) -> dict:
    if not SGLANG_CHAT_URL:
        raise RuntimeError(
            "No NemoClaw inference endpoint is configured. Set SGLANG_BASE_URL or NEMOCLAW_BASE_URL."
        )

    headers = {"Content-Type": "application/json"}
    if SGLANG_API_TOKEN:
        headers["Authorization"] = f"Bearer {SGLANG_API_TOKEN}"

    t_start = time.monotonic()
    try:
        result = await _attempt_chat(
            label="sglang",
            url=SGLANG_CHAT_URL,
            model=SGLANG_MODEL,
            system_content=system_content,
            user_content=user_content,
            timeout=timeout,
            headers=headers,
        )
        logger.info(
            "NemoClaw inference via sglang model=%s elapsed=%.2fs",
            SGLANG_MODEL,
            time.monotonic() - t_start,
        )
        return result
    except (httpx.ConnectError, httpx.TimeoutException) as exc:
        raise RuntimeError(f"NemoClaw SGLang endpoint unreachable: {exc}") from exc
    except httpx.HTTPStatusError as exc:
        raise RuntimeError(
            f"NemoClaw SGLang HTTP {exc.response.status_code}: {exc.response.text[:300]}"
        ) from exc
    except (KeyError, IndexError, TypeError, json.JSONDecodeError) as exc:
        raise RuntimeError(f"NemoClaw SGLang returned invalid JSON: {exc}") from exc


async def score_qd(
    *,
    lead_id: str,
    batch_id: str,
    blend_shapes: dict[str, float],
    video_ts_ms: int,
    scene_label: Optional[str] = None,
    crm_context: dict,
    current_qd_score: Optional[int] = None,
) -> QDResult:
    system_prompt = _load_system_prompt("qd_calculator")
    user_content = json.dumps(
        {
            "lead_id": lead_id,
            "batch_id": batch_id,
            "video_ts_ms": video_ts_ms,
            "scene_label": scene_label,
            "current_qd_score": current_qd_score,
            "crm_context": crm_context,
            "blend_shapes": blend_shapes,
        },
        indent=2,
    )
    data = await _nemoclaw_chat(system_prompt, user_content)
    raw_score = int(data.get("qd_score", current_qd_score or 50))
    return QDResult(
        qd_score=max(1, min(100, raw_score)),
        reasoning=str(data.get("reasoning", "")),
        confidence=float(data.get("confidence", 0.7)),
    )


async def tag_lead(
    *,
    lead_id: str,
    phone: str,
    budget: Optional[str],
    message_text: str,
) -> TagResult:
    system_prompt = _load_system_prompt("lead_tagger")
    user_content = (
        f"Lead ID: {lead_id}\n"
        f"Phone: {phone}\n"
        f"Budget indicator: {budget or 'unknown'}\n"
        f"First message: {message_text}"
    )
    try:
        data = await _nemoclaw_chat(system_prompt, user_content)
    except Exception as exc:
        logger.error("Lead tagging failed for %s: %s", lead_id, exc)
        return TagResult()
    return TagResult(
        tags_to_add=data.get("tags_to_add", []),
        tags_to_remove=data.get("tags_to_remove", []),
    )


async def profile_cctv_visitor(
    *,
    license_plate: Optional[str],
    zone: str,
    face_description: Optional[str] = None,
    vehicle_description: Optional[str] = None,
) -> CCTVProfileResult:
    system_prompt = _load_system_prompt("cctv_profiler")
    user_content = json.dumps(
        {
            "license_plate": license_plate,
            "zone": zone,
            "face_description": face_description,
            "vehicle_description": vehicle_description,
        },
        indent=2,
    )
    try:
        data = await _nemoclaw_chat(system_prompt, user_content, timeout=20.0)
    except Exception as exc:
        logger.error("CCTV profiling failed (zone=%s): %s", zone, exc)
        return CCTVProfileResult(wealth_indicator="unknown", vehicle_class="unknown")
    return CCTVProfileResult(
        wealth_indicator=data.get("wealth_indicator", "unknown"),
        vehicle_class=data.get("vehicle_class", "unknown"),
        tags_to_add=data.get("tags_to_add", []),
        notes=data.get("notes", ""),
    )


async def health_check() -> dict:
    headers = {"Content-Type": "application/json"}
    if SGLANG_API_TOKEN:
        headers["Authorization"] = f"Bearer {SGLANG_API_TOKEN}"

    results: dict[str, str] = {
        "model": SGLANG_MODEL,
        "primary_url": SGLANG_CHAT_URL,
        "models_url": SGLANG_MODELS_URL,
    }

    try:
        async with httpx.AsyncClient(timeout=5.0) as client:
            models_response = await client.get(SGLANG_MODELS_URL, headers=headers)
            models_response.raise_for_status()
            chat_response = await client.post(
                SGLANG_CHAT_URL,
                json={
                    "model": SGLANG_MODEL,
                    "messages": [{"role": "user", "content": "ping"}],
                    "max_tokens": 5,
                },
                headers=headers,
            )
            chat_response.raise_for_status()
        results["sglang"] = "ok"
    except Exception as exc:
        results["sglang"] = f"error: {exc}"

    return results