import os
import requests
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel

app = FastAPI()

# ---- Allow frontend access ----
app.add_middleware(
    CORSMiddleware,
    allow_origins=["https://voice-call-agent.vercel.app/"],  # ✅ Restrict in production
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# ---- Environment variables ----
OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
AIRTABLE_API_KEY = os.getenv("AIRTABLE_API_KEY")
AIRTABLE_BASE_ID = os.getenv("AIRTABLE_BASE_ID")
AIRTABLE_TABLE = "Appointments"

# ---- Ephemeral Key Endpoint ----
@app.get("/get-ephemeral-key")
def get_ephemeral_key():
    """Generate an ephemeral client secret for OpenAI Realtime API"""
    url = "https://api.openai.com/v1/realtime/client_secrets"
    headers = {
        "Authorization": f"Bearer {OPENAI_API_KEY}",
        "Content-Type": "application/json",
    }
    body = {
        "session": {
            "type": "realtime",
            "model": "gpt-4o-mini-realtime-preview",
            "audio": {
                "output": {"voice": "verse"}
            },
        }
    }

    res = requests.post(url, headers=headers, json=body)
    print("🔑 Ephemeral key request status:", res.status_code)
    data = res.json()
    print("🔑 Ephemeral key response:", data)
    return data


# ---- Add Appointment ----
class Appointment(BaseModel):
    name: str
    phone: str
    date: str
    time: str
    service: str


@app.post("/add")
def add_appointment(appo: Appointment):
    """Add a new appointment to Airtable (auto-increment ID handled by Airtable)"""
    url = f"https://api.airtable.com/v0/{AIRTABLE_BASE_ID}/{AIRTABLE_TABLE}"
    headers = {
        "Authorization": f"Bearer {AIRTABLE_API_KEY}",
        "Content-Type": "application/json",
    }
    data = {
        "fields": {
            "Name": appo.name,
            "Phone": appo.phone,
            "Date": appo.date,
            "Time": appo.time,
            "Service": appo.service,
        }
    }

    r = requests.post(url, headers=headers, json=data)
    print("🔹 Airtable Add Response:", r.status_code, r.text)
    return r.json()


# ---- Update Appointment ----
class UpdateAppointment(BaseModel):
    appointment_id: str
    name: str | None = None
    phone: str | None = None
    date: str | None = None
    time: str | None = None
    service: str | None = None


@app.post("/update")
def update_appointment(update: UpdateAppointment):
    """Update an existing appointment in Airtable using custom Appointment ID"""
    headers = {
        "Authorization": f"Bearer {AIRTABLE_API_KEY}",
        "Content-Type": "application/json",
    }

    # Step 1: Find record by Appointment ID field
    filter_formula = f"{{Appointment ID}} = '{update.appointment_id}'"
    search_url = f"https://api.airtable.com/v0/{AIRTABLE_BASE_ID}/{AIRTABLE_TABLE}?filterByFormula={filter_formula}"
    search_res = requests.get(search_url, headers=headers).json()

    if not search_res.get("records"):
        print("❌ No record found for Appointment ID:", update.appointment_id)
        return {"status": "error", "message": "Appointment not found"}

    record_id = search_res["records"][0]["id"]

    # Step 2: Prepare updated fields
    fields = {}
    if update.name:
        fields["Name"] = update.name
    if update.phone:
        fields["Phone"] = update.phone
    if update.date:
        fields["Date"] = update.date
    if update.time:
        fields["Time"] = update.time
    if update.service:
        fields["Service"] = update.service

    # Step 3: Patch record by record ID
    update_url = f"https://api.airtable.com/v0/{AIRTABLE_BASE_ID}/{AIRTABLE_TABLE}/{record_id}"
    patch_res = requests.patch(update_url, headers=headers, json={"fields": fields})
    print("🔸 Airtable Update Response:", patch_res.status_code, patch_res.text)

    if patch_res.status_code == 200:
        return {"status": "updated"}
    else:
        return {"status": "error", "message": "Update failed"}

class CancelAppointment(BaseModel):
    appointment_id: str


@app.post("/cancel")
def cancel_appointment(cancel: CancelAppointment):
    """Cancel appointment by custom Appointment ID field"""

    # Step 1: Search record by Appointment ID field
    filter_formula = f"{{Appointment ID}} = '{cancel.appointment_id}'"
    search_url = f"https://api.airtable.com/v0/{AIRTABLE_BASE_ID}/{AIRTABLE_TABLE}?filterByFormula={filter_formula}"

    headers = {"Authorization": f"Bearer {AIRTABLE_API_KEY}"}
    search_res = requests.get(search_url, headers=headers).json()

    if not search_res.get("records"):
        print("❌ No record found for Appointment ID:", cancel.appointment_id)
        return {"status": "error", "message": "Appointment not found"}

    record_id = search_res["records"][0]["id"]
    print(f"✅ Found Record ID: {record_id} for Appointment ID: {cancel.appointment_id}")

    # Step 2: Delete record by Record ID
    delete_url = f"https://api.airtable.com/v0/{AIRTABLE_BASE_ID}/{AIRTABLE_TABLE}/{record_id}"
    delete_res = requests.delete(delete_url, headers=headers)
    print("🗑️ Airtable Delete Response:", delete_res.status_code, delete_res.text)

    if delete_res.status_code == 200:
        return {"status": "deleted"}
    else:
        return {"status": "error", "message": "Delete failed"}