from fastapi import FastAPI, Request
from fastapi.responses import PlainTextResponse
from datetime import datetime, timezone, timedelta
import requests

app = FastAPI()

VERIFY_TOKEN = "my_secure_token"
PAGE_ACCESS_TOKEN = "EAAJGMsgQEhMBO0FxGBA1ZBKVIM6HmYYDK9stTrz4XjgN7PDOnkgH3g5WScFZBIVp6ZBXEN4rEsRuelZChxDnELXfojjkXyw9WUcZBYevkinXRIYsdjGZAGQ6QK2MDmnlX6mW4tD4uKzcpKxaaRDzPFouM51Vn6Yx5tatqYJyPBd39z1391QtEzTWWp8CS1BXuBdAJ078l4QF1uQ1ybQ4k4eksZD"
APP_ID = "640133872226835"
APP_SECRET = "01602f51d9aa49953064fda7c507ed7c"
REDIRECT_URI = "https://mr-help-binrushd-meta-authenticator.hf.space/webhook"

# ✅ رابط GAS WebApp (اللي بينتهي بـ /exec)
GAS_WEBAPP_URL = "https://script.google.com/macros/s/AKfycbzmFQvZtpwhO6r3aDbBUhYJAb_1N94DMRT4MnZScIsTi9EMzODkHk7ICEyuH77vFv1E/exec"

@app.get("/webhook")
async def verify_webhook(request: Request):
    params = request.query_params
    code = params.get("code")
    mode = params.get("hub.mode")
    token = params.get("hub.verify_token")
    challenge = params.get("hub.challenge")

    # ✅ OAuth2 token exchange عبر GAS بدل graph.facebook.com
    if code:
        print(f"🔑 Received code: {code}")

        gas_payload = {
            "action": "exchange_code",
            "client_id": APP_ID,
            "redirect_uri": REDIRECT_URI,
            "client_secret": APP_SECRET,
            "code": code
        }

        response = requests.post(GAS_WEBAPP_URL, json=gas_payload, timeout=20)
        print("🎟️ Token Exchange Response:")
        print(response.json())
        return PlainTextResponse("Token exchange completed")

    # Webhook verification logic
    if mode == "subscribe" and token == VERIFY_TOKEN:
        return PlainTextResponse(content=challenge)
    return PlainTextResponse(content="Verification failed", status_code=403)

@app.post("/webhook")
async def receive_webhook(request: Request):
    payload = await request.json()
    print("📥 Webhook payload received:")

    gmt_plus_3 = timezone(timedelta(hours=3))
    print("Timestamp:", datetime.now(gmt_plus_3).strftime('%Y-%m-%d %H:%M:%S'))

    try:
        for entry in payload.get("entry", []):
            for change in entry.get("changes", []):
                if change.get("field") == "leadgen":
                    lead_id = change["value"]["leadgen_id"]
                    print(f"🔍 Lead ID: {lead_id}")

                    # ✅ Fetch lead details عبر GAS بدل graph.facebook.com
                    gas_payload = {
                        "action": "fetch_lead",
                        "lead_id": lead_id,
                        "access_token": PAGE_ACCESS_TOKEN
                    }

                    lead_resp = requests.post(GAS_WEBAPP_URL, json=gas_payload, timeout=20)
                    lead_data = lead_resp.json()

                    print("📄 Lead Details:")
                    print(lead_data)

                    for item in lead_data.get("field_data", []):
                        field_name = item.get("name")
                        field_value = ", ".join(item.get("values", []))
                        print(f"{field_name}: {field_value}")

    except Exception as e:
        print(f"⚠️ Error processing lead: {e}")

    return {"status": "ok"}