import os
from twilio.rest import Client
from dotenv import load_dotenv

load_dotenv()

from utils.config_loader import get_setting

load_dotenv()

# Twilio vars are now dynamic

def send_sms(to: str, body: str) -> str:
    account_sid = get_setting("TWILIO_ACCOUNT_SID")
    auth_token = get_setting("TWILIO_AUTH_TOKEN")
    twilio_number = get_setting("TWILIO_NUMBER")

    if not all([account_sid, auth_token, twilio_number]):
        print("Twilio credentials are not set.")
        return "" # Return empty string on failure

    client = Client(account_sid, auth_token)
    message = client.messages.create(
        body=body,
        from_=twilio_number,
        to=to
    )
    return message.sid

# --- SMS Templates ---

ACCOUNT_VERIFICATION_SMS_TEMPLATE = (
    "Welcome to the AI-Powered Medicine Dispenser System, {full_name}! "
    "Please verify your account using this link: {verification_link}"
)

MEDICINE_ADDED_SMS_TEMPLATE = (
    "Hi {full_name}, your medicine '{medicine_name}' (Dosage: {dosage}, Time: {time}) has been added to your schedule."
)

MEDICINE_REMINDER_SMS_TEMPLATE = (
    "Reminder: It's time to take your medicine '{medicine_name}' (Dosage: {dosage}) at {time}."
)

MEDICINE_MISSED_SMS_TEMPLATE = (
    "ALERT: You missed your medicine '{medicine_name}' (Dosage: {dosage}) scheduled at {time}."
)

MEDICINE_UPDATED_SMS_TEMPLATE = (
    "Hi {full_name}, your medicine '{medicine_name}' (Dosage: {dosage}, Time: {time}) has been UPDATED in your schedule."
)

def send_account_verification_sms(to: str, full_name: str, verification_link: str) -> str:
    body = ACCOUNT_VERIFICATION_SMS_TEMPLATE.format(full_name=full_name, verification_link=verification_link)
    return send_sms(to, body)

def send_medicine_added_sms(to: str, full_name: str, medicine_name: str, dosage: str, time: str) -> str:
    body = MEDICINE_ADDED_SMS_TEMPLATE.format(
        full_name=full_name, medicine_name=medicine_name, dosage=dosage, time=time
    )
    return send_sms(to, body)

def send_medicine_reminder_sms(to: str, medicine_name: str, dosage: str, time: str) -> str:
    body = MEDICINE_REMINDER_SMS_TEMPLATE.format(
        medicine_name=medicine_name, dosage=dosage, time=time
    )
    return send_sms(to, body)

def send_medicine_missed_sms(to: str, full_name: str, medicine_name: str, dosage: str, time: str) -> str:
    body = MEDICINE_MISSED_SMS_TEMPLATE.format(
        full_name=full_name, medicine_name=medicine_name, dosage=dosage, time=time
    )
    return send_sms(to, body)

def send_medicine_updated_sms(to: str, full_name: str, medicine_name: str, dosage: str, time: str) -> str:
    body = MEDICINE_UPDATED_SMS_TEMPLATE.format(
        full_name=full_name, medicine_name=medicine_name, dosage=dosage, time=time
    )
    return send_sms(to, body)

# --- Pre-order Confirmation SMS ---
PREORDER_CONFIRMATION_SMS_TEMPLATE = (
    "Dear {full_name}, your pre-order request has been received. Our company will contact you soon. - Medicine Dispenser Team"
)

def send_preorder_confirmation_sms(to: str, full_name: str) -> str:
    body = PREORDER_CONFIRMATION_SMS_TEMPLATE.format(full_name=full_name)
    return send_sms(to, body)