from datetime import datetime
from typing import List
from openai import OpenAI
from db_user import _load_history, supabase
from config import OPENAI_CLASSIFIER_MODEL
from util_llm import safe_parse_json

import os

# Set default model
MODEL = OPENAI_CLASSIFIER_MODEL
client = OpenAI(api_key=os.getenv("OPENAI_API_KEY"))

GENERIC_TOPICS = {
    "Politics": "Domestic or international political parties, leaders, elections, government decisions",
    "Government & Elections": "Policies, governance structures, elections at any level",
    "Law & Justice": "Courts, legislation, police, justice system",
    "Economy & Finance": "Markets, inflation, trade, personal finance, banking",
    "International Relations / Geopolitics": "Diplomacy, treaties, conflicts between states",
    "War & Conflicts": "Armed conflicts, military actions, peace negotiations",
    "Environment & Climate": "Climate change, natural disasters, conservation, sustainability",
    "Energy & Sustainability": "Oil, gas, renewables, energy transition",
    "Science & Research": "Discoveries, academic research, biology, physics",
    "Technology & Innovation": "Software, AI, internet, digital tools",
    "Space & Astronomy": "Space missions, astronomy, astrophysics",
    "Arts & Culture": "Painting, theatre, museums, cultural heritage",
    "Music": "Music industry, artists, concerts, releases",
    "Movies & TV": "Cinema, TV shows, streaming",
    "Literature & Philosophy": "Books, philosophy, critical thought",
    "Food & Cooking": "Recipes, gastronomy, culinary culture",
    "Travel & Tourism": "Destinations, flights, travel trends",
    "Soccer / Football": "Football clubs, players, tournaments, matches",
    "Basketball": "Basketball leagues, players, tournaments",
    "Tennis": "Tennis players, tournaments, competitions",
    "Other Sports": "Rugby, cricket, athletics, swimming, etc.",
    "Olympics": "Olympic Games and preparation",
    "Business & Corporations": "Companies, industries, corporate moves",
    "Jobs & Employment": "Career, labour market, unemployment",
    "Real Estate & Housing": "Housing markets, property, mortgages",
    "Health Industry": "Healthcare sector, pharma, biotech",
    "Education": "Schools, universities, education policies",
    "Health & Medicine": "Personal health, medical research, treatments",
    "Social Issues": "Inequality, migration, human rights",
    "Religion & Spirituality": "Religions, spiritual practices, rituals",
    "Celebrity & Entertainment": "Celebrities, influencers, entertainment news"
}


def query_llm_rewrite_only(prompt: str, model: str = MODEL) -> str:
    """Minimal wrapper for LLM calls."""
    response = client.chat.completions.create(
        model=model,
        messages=[{"role": "user", "content": prompt}],
        temperature=0
    )
    return response.choices[0].message.content.strip()


def extract_topics_from_history(user_id: str  = None, max_topics: int = 3) -> list[dict]:
    """Classify topics from the *latest* chat session as a whole."""
    data = _load_history("chat_history_short", user_id)
    sessions = data.get("sessions", [])
    if not sessions:
        return []

    msgs = []
    last_session = sessions[-1]
    for m in last_session.get("messages", []):
        if isinstance(m, dict) and m.get("content"):
            msgs.append(m["content"])

    combined = "\n".join(msgs[-20:])  # last 20 msgs for context

    # call classifier once on the whole session
    classification = classify_topic_with_llm(combined)

    # make sure the result is always a list
    if isinstance(classification, dict):
        return [classification]
    elif isinstance(classification, list):
        return classification[:max_topics]
    return []


def update_topic_log(user_id: str  = None) -> dict:
    """
    Update both generic and specific topic logs for the latest session.
    - Generic topics: increment only in predefined taxonomy
    - Specific topics: insert new or merge aliases
    Returns top 2 generic + top 2 specific topics
    """
    ensure_generic_topics(user_id)
    
    # --- Extract topics from recent history ---
    candidates = extract_topics_from_history(user_id=user_id)
    now = datetime.utcnow().isoformat()

    for classification in candidates:
        generic = classification.get("generic_topic")
        specific = classification.get("specific_topic")
        aliases = classification.get("aliases", [])

        # --- Update generic table ---
        if generic:
            update_generic_topic(user_id, generic, now)

        # --- Update specific table ---
        if specific:
            update_specific_topic(user_id, specific, parent_generic=generic, aliases=aliases, now=now)

    # --- Get top 2 generic topics ---
    resp_gen = (
        supabase.table("topic_log_generic")
        .select("*")
        .eq("user_id", user_id)
        .order("count", desc=True)
        .order("last_discussed", desc=True)
        .limit(2)
        .execute()
    )
    top_generic = [row["topic"] for row in resp_gen.data]

    # --- Get top 2 specific topics ---
    resp_spec = (
        supabase.table("topic_log_specific")
        .select("*")
        .eq("user_id", user_id)
        .order("count", desc=True)
        .order("last_discussed", desc=True)
        .limit(2)
        .execute()
    )
    top_specific = [row["topic"] for row in resp_spec.data]

    return {"generic": top_generic, "specific": top_specific}


def classify_topic_with_llm(text: str, model: str = MODEL, max_topics: int = 3) -> list[dict]:
    """
    Classify a text snippet (whole session) into up to N topics.
    Each topic has:
      - generic_topic: one of the predefined taxonomy
      - specific_topic: optional entity or concept (e.g. AS Roma, Stoicism)
      - aliases: list of synonyms/variants for the specific topic
    """
    taxonomy = "\n".join([f"- {k}: {v}" for k, v in GENERIC_TOPICS.items()])

    prompt = f"""
You are a topic classifier.

TASK:
- Analyze the following text (represents a full chat session).
- Extract up to {max_topics} distinct topics discussed.
- For each topic return:
  1. generic_topic: one of the predefined taxonomy below
  2. specific_topic: optional team, person, place, or concept (null if none)
  3. aliases: list of synonyms/variants/alternative names for the specific topic

GENERIC TAXONOMY:
{taxonomy}

RULES:
- generic_topic MUST be exactly one of the predefined categories.
- aliases must always include the phrase mentioned in the text.
- If no specific entity is present, set specific_topic=null and aliases=[].
- Return ONLY a JSON array of objects, each object with keys:
  ["generic_topic", "specific_topic", "aliases"]

TEXT:
{text}
"""

    raw = query_llm_rewrite_only(prompt, model=model)

    try:
        parsed = safe_parse_json(raw)
        if isinstance(parsed, list):
            return parsed[:max_topics]
        elif isinstance(parsed, dict):
            return [parsed]
    except Exception:
        # fallback: assume unknown generic
        return [{"generic_topic": "Other", "specific_topic": None, "aliases": []}]

    
def update_specific_topic(user_id: str, specific: str, parent_generic: str, aliases: list[str], now: str):
    """
    Upsert a specific topic linked to a generic parent.
    - If the topic or one of its aliases already exists → update count, merge aliases.
    - Otherwise insert as a new specific topic.
    """

    # 1. Fetch all existing specific topics for this user
    resp = supabase.table("topic_log_specific").select("*").eq("user_id", user_id).execute()
    existing_topics = resp.data or []

    # 2. Try to find a match by topic or alias
    matched_row = None
    for row in existing_topics:
        row_aliases = row.get("aliases", []) or []
        if specific == row["topic"] or specific in row_aliases:
            matched_row = row
            break

    if matched_row:
        # 3. Update existing row
        current_count = int(matched_row.get("count", 0)) + 1
        current_aliases = set(matched_row.get("aliases", []) or [])
        new_aliases = set(aliases or [])
        merged_aliases = list(current_aliases.union(new_aliases))

        supabase.table("topic_log_specific").update({
            "count": current_count,
            "last_discussed": now,
            "aliases": merged_aliases
        }).eq("user_id", user_id).eq("topic", matched_row["topic"]).execute()

    else:
        # 4. Insert new row
        supabase.table("topic_log_specific").insert({
            "user_id": user_id,
            "topic": specific,
            "aliases": aliases or [specific],
            "parent_generic": parent_generic,
            "count": 1,
            "last_discussed": now
        }).execute()

def update_generic_topic(user_id: str, topic: str, now: str):
    """
    Increment count for a predefined generic topic.
    Assumes rows are already seeded for each user.
    """
    resp = supabase.table("topic_log_generic").select("count").eq("user_id", user_id).eq("topic", topic).execute()
    if resp.data:
        current_count = int(resp.data[0]["count"])
        supabase.table("topic_log_generic").update({
            "count": current_count + 1,
            "last_discussed": now
        }).eq("user_id", user_id).eq("topic", topic).execute()
    else:
        # Fallback: this should not happen if seeding was done
        supabase.table("topic_log_generic").insert({
            "user_id": user_id,
            "topic": topic,
            "count": 1,
            "last_discussed": now
        }).execute()

def ensure_generic_topics(user_id: str):
    """
    Ensure that all predefined generic topics exist for the user.
    If missing, insert them with count=0.
    """
    resp = supabase.table("topic_log_generic").select("topic").eq("user_id", user_id).execute()
    existing = {row["topic"] for row in resp.data} if resp.data else set()

    missing = [t for t in GENERIC_TOPICS.keys() if t not in existing]
    if missing:
        rows = [
            {"user_id": user_id, "topic": t, "count": 0, "last_discussed": None}
            for t in missing
        ]
        supabase.table("topic_log_generic").insert(rows).execute()
        print(f"✅ Seeded {len(missing)} generic topics for user {user_id}")
    else:
        print(f"ℹ️ All generic topics already exist for user {user_id}")