from __future__ import annotations

from fnmatch import fnmatchcase
from typing import Any, Dict

from news_mcp.config import NEWS_ENTITY_BLACKLIST, DEFAULT_TOPICS
from news_mcp.entity_normalize import normalize_entities
from news_mcp.llm import call_extraction, call_summary
from news_mcp.trends_resolution import resolve_entity_via_trends


def _matches_blacklist(value: str, blacklist=None) -> bool:
    patterns = [x.strip().lower() for x in (blacklist if blacklist is not None else NEWS_ENTITY_BLACKLIST) if x and x.strip()]
    key = str(value).strip().lower()
    if not key:
        return True
    return any(fnmatchcase(key, pattern) for pattern in patterns)


def _filter_entities(entities, blacklist=None):
    out = []
    for ent in entities or []:
        if _matches_blacklist(ent, blacklist=blacklist):
            continue
        out.append(ent)
    return out


async def classify_cluster_llm(cluster: Dict[str, Any]) -> Dict[str, Any]:
    parsed = await call_extraction(cluster)
    out = dict(cluster)

    # Topic: prefer the LLM's classification, fall back to the heuristic topic
    # already on the input cluster. Validate against the allowed set so we never
    # promote a free-form string into the SQL row column.
    raw_topic = parsed.get("topic", cluster.get("topic"))
    topic = str(raw_topic).strip().lower() if raw_topic else None
    if topic and _matches_blacklist(topic):
        topic = "other"
    if topic not in {t.lower() for t in DEFAULT_TOPICS}:
        # Unknown / hallucinated label -> fall back to whatever the heuristic
        # classifier on the headline gave us, else "other".
        fallback = str(cluster.get("topic") or "").strip().lower()
        topic = fallback if fallback in {t.lower() for t in DEFAULT_TOPICS} else "other"

    # IMPORTANT: normalize aliases BEFORE applying the blacklist, otherwise
    # blacklisting "bitcoin" misses entries the LLM returned as "btc".
    entities = _filter_entities(normalize_entities(parsed.get("entities", [])))
    keywords = _filter_entities(normalize_entities(parsed.get("keywords", [])))

    out.update({
        "topic": topic,
        "entities": entities,
        "entityResolutions": [resolve_entity_via_trends(e) for e in entities],
        "sentiment": parsed.get("sentiment", "neutral"),
        "sentimentScore": parsed.get("sentimentScore"),
        "keywords": keywords,
    })
    return out


async def summarize_cluster_llm(cluster: Dict[str, Any]) -> Dict[str, Any]:
    parsed = await call_summary(cluster)
    return parsed


# Backward-compatible aliases during the transition away from provider-specific naming.
classify_cluster_groq = classify_cluster_llm
summarize_cluster_groq = summarize_cluster_llm