import os
import re
import asyncio
import uvicorn
from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from telethon import TelegramClient
from contextlib import asynccontextmanager

# --- CONFIG ---
API_ID = 21934109
API_HASH = 'e7e8c554b9ff88d180983996c33bdf27'
BOT_USERNAME = '@TruecallerInfoLookupBot'

# Dynamically bind to Hugging Face's required routing port (defaults to 7860)
PORT = int(os.environ.get("PORT", 7860))

# Cache profile ID to prevent hitting rate limits
state = {"my_id": None}

# --- INITIALIZE THE CLEAN CLIENT ---
# We point directly to the standard connection layer since Hugging Face supports it natively
client = TelegramClient('/code/lookup_session', API_ID, API_HASH)

def parse_to_json(text: str) -> dict:
    """Parses the bot text into a structured dictionary."""
    e_match = re.search(r'Eyecon.*?Name:\s*`?(.*?)`?(?:\n|$)', text, re.IGNORECASE | re.DOTALL)
    c_match = re.search(r'CALLAPP.*?Name:\s*`?(.*?)`?(?:\n|$)', text, re.IGNORECASE | re.DOTALL)
    
    name1 = e_match.group(1).strip() if e_match else None
    name2 = c_match.group(1).strip() if c_match else None

    data = {}
    if name1:
        data["name1"] = name1
    if name2:
        data["name2"] = name2

    if not name1 and not name2:
        fallback = re.search(r'Name:\s*`?(.*?)`?(?:\n|$)', text, re.IGNORECASE)
        if fallback:
            data["name1"] = fallback.group(1).strip()

    carrier_match = re.search(r'Carrier:\s*`?(.*?)`?(?:\n|$)', text, re.IGNORECASE)
    location_match = re.search(r'Location:\s*`?(.*?)`?(?:\n|$)', text, re.IGNORECASE)
    
    data["carrier"] = carrier_match.group(1).strip() if carrier_match else "N/A"
    data["location"] = location_match.group(1).strip() if location_match else "N/A"
    data["full_text"] = text
    
    return data

# --- NATIVE FASTAPI ASYNC LIFECYCLE ---
@asynccontextmanager
async def lifespan(app: FastAPI):
    session_path = "/code/lookup_session.session"
    print(f"[STARTUP] Looking for session file at: {session_path}")
    
    try:
        print("[STARTUP] Connecting directly to Telegram Network...")
        await client.connect()
    except Exception as e:
        print(f"\n[CRITICAL] Connection failed: {e}\n")
        raise e

    if not await client.is_user_authorized():
        print("!!! NOT LOGGED IN. Please verify your 'lookup_session.session' file !!!")
    else:
        print("Telethon Connected and Authorized.")
        me = await client.get_me()
        state["my_id"] = me.id
        
    yield
    print("[SHUTDOWN] Disconnecting Telegram Client...")
    await client.disconnect()

app = FastAPI(lifespan=lifespan)

# --- CORS CONFIGURATION ---
app.add_middleware(
    CORSMiddleware,
    allow_origins=["https://crm.gudmed.in"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# --- HEALTH CHECK ROUTE (Keeps Hugging Face Routing Live) ---
@app.get("/")
async def root_index():
    return {"status": "healthy", "service": "Telegram Truecaller Polling API"}

# --- PRIMARY LOOKUP ENDPOINT ---
@app.get("/lookup")
async def lookup(phone: str):
    # Take last 10 digits
    clean_phone = str(phone)[-10:].strip()
    
    if not state["my_id"]:
        raise HTTPException(status_code=503, detail="Telegram client not authorized or fully connected.")
    
    try:
        print(f"[API] Sending search payload for target: +91{clean_phone}")
        # 1. Send the number to the bot
        await client.send_message(BOT_USERNAME, f'+91{clean_phone}')
        
        # 2. Polling logic (Checks every 0.5s for 40 attempts -> 20 seconds total)
        for i in range(40):
            await asyncio.sleep(0.5) 
            
            # Fetch latest 3 messages to bypass ads or temporary indicators
            messages = await client.get_messages(BOT_USERNAME, limit=3)
            
            for m in messages:
                # Confirm message came from the bot, not your own account
                if m.sender_id != state["my_id"]:
                    
                    # Ignore working status frames
                    if not m.text or any(x in m.text for x in ["Searching", "Please wait", "Typing"]):
                        continue
                    
                    # Target confirmation check
                    if clean_phone in m.text:
                        print(f"[API] Target found on polling loop step {i}! Processing...")
                        return {
                            "status": "success",
                            "phone": clean_phone,
                            "data": parse_to_json(m.text)
                        }

        raise HTTPException(status_code=504, detail="Timeout: Bot didn't respond with correct number in time.")
        
    except HTTPException:
        raise
    except Exception as e:
        print(f"Lookup Error: {e}")
        raise HTTPException(status_code=500, detail=str(e))

if __name__ == "__main__":
    uvicorn.run("main:app", host="0.0.0.0", port=PORT, loop="asyncio")