from fastapi import APIRouter, HTTPException
from pydantic import BaseModel
from swiggy_scraper import fetch_swiggy_orders
from datetime import datetime
from openai import OpenAI
import os, json

router = APIRouter()
client = OpenAI(api_key=os.getenv("OPENAI_API_KEY"))

class QueryInput(BaseModel):
    query: str

class DateRange(BaseModel):
    start_date: str
    end_date: str

# @router.post("/parse_query")
# def parse_query_llm(input: QueryInput):

#     print("\ninput query:")
#     print(input)

#     today_str = datetime.today().strftime("%d-%b-%Y")
#     system = (
#         f"You are a date range extractor.\n"
#         f"Today is {today_str}.\n"
#         "Extract start_date and end_date in 'DD-MMM-YYYY' format.\n"
#         "Respond with:\n"
#         "Output ONLY a valid JSON object like:\n"
#         '{ "start_date": "17-May-2025", "end_date": "18-May-2025" }\n'
#         'no extra commentry needed.'
#     )
#     try:
#         rsp = client.chat.completions.create(
#             model="gpt-4o-mini",
#             temperature=0,
#             messages=[
#                 {"role": "system", "content": system},
#                 {"role": "user", "content": input.query},
#             ]
#         )
#         result = json.loads(rsp.choices[0].message.content.strip())
#         if "start_date" not in result or "end_date" not in result:
#             raise ValueError("Invalid response format")
#         print("results:", result)
#         return result
#     except Exception as e:
#         raise HTTPException(status_code=400, detail=str(e))







def _llm(messages, model="gpt-4o-mini", temperature=0):
    rsp = client.chat.completions.create(
        model=model,
        temperature=temperature,
        messages=messages,
    )
    return rsp.choices[0].message.content.strip()

# ----------  Stage 1: classify + extract dates --------------------------

def _extract_scope(user_query: str):
    today_str = datetime.today().strftime("%d-%b-%Y")

    sys_prompt = f"""
Today is {today_str}.
You are a SCOPING assistant: decide if the user's text is about Swiggy food orders,
extract ONE date range, and keep the leftover words.

Return ONLY valid JSON like:
{{
  "is_swiggy_query": true,
  "start_date": "15-May-2025",
  "end_date":   "20-May-2025",
  "remainder":  "non veg expense"
}}

Rules:
• Accept natural phrases (“last week”, “since 1 May”).  
• If no dates → start_date & end_date = null.  
• If not Swiggy related → is_swiggy_query=false and remainder is full original text.  
• Do NOT invent a remainder; it is literally whatever words follow the date phrase(s).  
"""
    raw = _llm(
        [
            {"role": "system", "content": sys_prompt},
            {"role": "user",   "content": user_query}
        ]
    )
    return json.loads(raw)

# ----------  Stage 2: shrink “remainder” into an intent -----------------

def _extract_intent(remainder: str):
    sys_prompt = """
You are an INTENT classifier for Swiggy-order analytics.
Map the sentence into one concise snake_case intent.
Allowed intents (extendable):

• calculate_expense
• list_orders
• list_items
• list_nonveg_items
• list_veg_items
• count_orders
• unknown

Return JSON: { "intent": "calculate_expense" }
If unsure choose "unknown".
"""
    raw = _llm(
        [
            {"role": "system", "content": sys_prompt},
            {"role": "user",   "content": remainder.strip()}
        ]
    )
    return json.loads(raw)["intent"]

# ----------  FastAPI route ----------------------------------------------

@router.post("/parse_query")
def parse_query_llm(input: QueryInput):
    try:
        scope = _extract_scope(input.query)
        print("scope")
        print(scope)
        # If it is a Swiggy query, classify intent; else, intent = "unrelated"
        if scope.get("is_swiggy_query", False):
            intent = _extract_intent(scope.get("remainder", ""))
        else:
            intent = "unrelated"

        result = {
            "is_swiggy_query": scope["is_swiggy_query"],
            "start_date":      scope["start_date"],
            "end_date":        scope["end_date"],
            "intent":          intent
        }


        print("result")
        print(result)

        return result

    except Exception as e:
        raise HTTPException(status_code=400, detail=str(e))








@router.post("/get_orders")
def get_orders(range: DateRange):
    try:
        orders = fetch_swiggy_orders(range.start_date, range.end_date)
        return orders
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))