from fastapi import FastAPI
import json
import difflib
from flair.models import SequenceTagger
from flair.data import Sentence

app = FastAPI()

# Ladda Flair flerspråkig NER-modell
try:
    tagger = SequenceTagger.load("flair/ner-multi")
except Exception as e:
    print(f"Error loading model: {str(e)}")
    raise e

# Ladda entiteter från entities.json
with open("entities.json") as f:
    entities = json.load(f)
ITEMS = set(entities["items"])
COLORS = set(entities["colors"])
PRICES = set(entities["prices"])

def correct_spelling(word, valid_words, threshold=0.7):
    """Korrigera stavfel."""
    normalized = word.rstrip("etn")
    matches = difflib.get_close_matches(normalized, valid_words, n=1, cutoff=threshold)
    return matches[0] if matches else word

@app.post("/parse")
async def parse_user_request(request: str):
    if not request or len(request) > 200:
        return {"error": "Ogiltig eller för lång begäran"}
    try:
        # Skapa Flair Sentence
        sentence = Sentence(request)
        
        # Prediktera NER-taggar
        tagger.predict(sentence)
        
        # Extrahera entiteter
        result_entities = {}
        # Kolla färger och priser i hela meningen
        words = request.lower().split()
        for word in words:
            if word in COLORS:
                result_entities["FÄRG"] = word
            elif word in PRICES:
                result_entities["PRIS"] = word
        
        # Extrahera varor från NER
        for entity in sentence.get_spans("ner"):
            if entity.tag in ["MISC", "ORG", "LOC"]:  # Diverse, organisationer, platser som potentiella objekt
                corrected = correct_spelling(entity.text.lower(), ITEMS)
                if corrected in ITEMS:
                    result_entities["VARA"] = corrected
                elif not result_entities.get("VARA"):
                    result_entities["VARA"] = entity.text.lower()
        
        # Om ingen vara hittades
        if "VARA" not in result_entities:
            return {"result": "error:ingen vara"}
        
        # Skapa strukturerad sträng
        result_parts = [f"vara:{result_entities['VARA']}"]
        if "FÄRG" in result_entities:
            result_parts.append(f"färg:{result_entities['FÄRG']}")
        if "PRIS" in result_entities:
            result_parts.append(f"pris:{result_entities['PRIS']}")
        
        return {"result": ",".join(result_parts)}
    except Exception as e:
        return {"error": f"Fel vid parsning: {str(e)}"}

@app.get("/")
async def root():
    return {"message": "Request Parser API is running!"}