"""Canonical type classification pipeline for Atlas entities."""

from __future__ import annotations

import json
import os
from dataclasses import dataclass
from datetime import datetime, timezone
from typing import Optional

import httpx

from app.models import AtlasProvenance

CANONICAL_TYPES = [
    "Person",
    "Organization",
    "Location",
    "CreativeWork",
    "Event",
    "Product",
    "Other",
]

WIKIDATA_CLASS_MAP = {
    "Q5": "Person",
    "Q43229": "Organization",
    "Q17334923": "Location",  # human settlement
    "Q515": "Location",  # city
    "Q82794": "Location",  # geographic region
    "Q16521": "Taxon",
    "Q571": "CreativeWork",
    "Q11424": "CreativeWork",  # film
    "Q49848": "CreativeWork",  # album
    "Q1656682": "Event",
    "Q191067": "Product",
}

OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
OPENAI_MODEL = os.getenv("ATLAS_OPENAI_MODEL", os.getenv("OPENAI_MODEL", "gpt-4o-mini"))
GROQ_API_KEY = os.getenv("GROQ_API_KEY")
GROQ_MODEL = os.getenv(
    "ATLAS_GROQ_MODEL",
    os.getenv("GROQ_MODEL", "meta-llama/llama-4-scout-17b-16e-instruct"),
)


@dataclass
class TypeClassification:
    canonical_type: Optional[str]
    provenance: Optional[AtlasProvenance]
    needs_curation: bool


async def classify_entity_type(subject: str, resolution: dict, context: Optional[str]) -> TypeClassification:
    label = resolution.get("canonical_label") or subject
    wikidata_hit = await _classify_via_wikidata(label)
    if wikidata_hit is not None:
        return wikidata_hit

    llm_hit = await _classify_via_llm(subject, resolution, context)
    if llm_hit is not None:
        return llm_hit

    return TypeClassification(canonical_type=None, provenance=None, needs_curation=True)


async def _classify_via_wikidata(label: str) -> Optional[TypeClassification]:
    search_params = {
        "action": "wbsearchentities",
        "search": label,
        "language": "en",
        "limit": 1,
        "format": "json",
    }
    try:
        async with httpx.AsyncClient(timeout=8) as client:
            search_resp = await client.get("https://www.wikidata.org/w/api.php", params=search_params)
            search_resp.raise_for_status()
            search_data = search_resp.json()
            if not search_data.get("search"):
                return None
            entity_id = search_data["search"][0].get("id")
            if not entity_id:
                return None
            data_resp = await client.get(
                f"https://www.wikidata.org/wiki/Special:EntityData/{entity_id}.json",
                params={"flavor": "dump"},
            )
            data_resp.raise_for_status()
            data_payload = data_resp.json()
            entities = data_payload.get("entities", {})
            entity_block = entities.get(entity_id)
            if not entity_block:
                return None
            claims = entity_block.get("claims", {})
            p31 = claims.get("P31", [])
            for claim in p31:
                mainsnak = claim.get("mainsnak", {})
                datavalue = mainsnak.get("datavalue", {})
                value = datavalue.get("value", {})
                wid = value.get("id")
                canonical = WIKIDATA_CLASS_MAP.get(wid)
                if canonical:
                    prov = AtlasProvenance(
                        source="wikidata",
                        retrieval_method="type-classification",
                        confidence=0.97,
                        retrieved_at=datetime.now(timezone.utc).isoformat(),
                    )
                    return TypeClassification(canonical_type=canonical, provenance=prov, needs_curation=False)
    except Exception:
        return None
    return None


async def _classify_via_llm(subject: str, resolution: dict, context: Optional[str]) -> Optional[TypeClassification]:
    provider = None
    if GROQ_API_KEY:
        provider = "groq"
    elif OPENAI_API_KEY:
        provider = "openai"
    if provider is None:
        return None

    prompt = _build_llm_prompt(subject, resolution, context)
    payload = {
        "model": GROQ_MODEL if provider == "groq" else OPENAI_MODEL,
        "messages": [
            {
                "role": "system",
                "content": (
                    "You classify named entities into canonical Atlas types. "
                    "Valid types: Person, Organization, Location, CreativeWork, Event, Product, Other. "
                    "Respond with JSON: {\"type\": <type>, \"confidence\": <0-1>, \"reason\": <short>}"
                ),
            },
            {"role": "user", "content": prompt},
        ],
        "temperature": 0,
    }
    headers = {"Content-Type": "application/json"}
    url = "https://api.groq.com/openai/v1/chat/completions"
    if provider == "groq":
        headers["Authorization"] = f"Bearer {GROQ_API_KEY}"
    else:
        headers["Authorization"] = f"Bearer {OPENAI_API_KEY}"
        url = "https://api.openai.com/v1/chat/completions"
    try:
        async with httpx.AsyncClient(timeout=15) as client:
            resp = await client.post(url, json=payload, headers=headers)
            resp.raise_for_status()
            data = resp.json()
            choice = data.get("choices", [{}])[0]
            message = choice.get("message", {})
            content = message.get("content")
            if not content:
                return None
            parsed = _parse_llm_json(content)
            if not parsed:
                return None
            canonical_type = parsed.get("type")
            confidence = float(parsed.get("confidence", 0))
            if canonical_type not in CANONICAL_TYPES:
                return None
            needs_curation = confidence < 0.6
            prov = AtlasProvenance(
                source=f"{provider}-llm",
                retrieval_method="type-classification",
                confidence=confidence,
                retrieved_at=datetime.now(timezone.utc).isoformat(),
            )
            return TypeClassification(canonical_type=canonical_type, provenance=prov, needs_curation=needs_curation)
    except Exception:
        return None

    return None


def _build_llm_prompt(subject: str, resolution: dict, context: Optional[str]) -> str:
    raw_type = resolution.get("type") or resolution.get("raw_type") or ""
    candidates = resolution.get("candidates") or []
    candidate_titles = ", ".join(sorted({c.get("title") for c in candidates if c.get("title")}))
    parts = [
        f"Subject: {subject}",
        f"Canonical label: {resolution.get('canonical_label')}",
        f"Raw type hints: {raw_type}",
        f"Candidates: {candidate_titles}",
    ]
    if context:
        parts.append(f"Context: {context}")
    parts.append(f"Return JSON with keys type/confidence/reason. Types allowed: {', '.join(CANONICAL_TYPES)}")
    return "\n".join(parts)


def _parse_llm_json(text: str) -> Optional[dict]:
    text = text.strip()
    if text.startswith("```") and text.endswith("```"):
        inner = text.strip("`")
        if inner.lower().startswith("json"):
            inner = inner[4:]
        text = inner
    try:
        return json.loads(text)
    except Exception:
        return None