from typing import List
from backend.infra.email_sender_handler import EmailSenderHandler
from backend.infra.email.email_validation_handler import EmailValidationHandler
from backend.models.models import EmailSenderDoc


class EmailSenderService:
    def __init__(self):
        self.email_sender_handler = EmailSenderHandler()
        self.email_validation_handler = EmailValidationHandler()
    
    async def get_email_sender(self, tenant_id: str) -> str:
        """get email sender for tenant"""
        if not tenant_id:
            raise ValueError("tenant_id is required")
        
        return await self.email_sender_handler.get_email_sender(tenant_id)

    async def set_email_sender(self, tenant_id: str, email_sender: str):
        """set email sender for tenant"""
        if not tenant_id:
            raise ValueError("tenant_id is required")
        
        if not email_sender:
            raise ValueError("email_sender must be provided")
        
        if not await self.email_validation_handler.is_valid_email(email_sender):
            raise ValueError("Invalid email format")
        
        # TODO: check if the email is already registered in SendGrid or other email service provider
        
        return await self.email_sender_handler.set_email_sender(tenant_id, email_sender)

    async def update_email_sender(self, tenant_id: str, email_sender: str):
        """update email sender for tenant (only if exists)"""
        if not tenant_id:
            raise ValueError("tenant_id is required")
        
        if not email_sender:
            raise ValueError("email_sender must be provided")

        if not await self.email_validation_handler.is_valid_email(email_sender):
            raise ValueError("Invalid email format")

        # Check if email sender exists first
        existing_sender = await self.email_sender_handler.get_email_sender(tenant_id)
        if not existing_sender:
            raise ValueError("Email sender configuration not found for this tenant")
        
        # TODO: check if the email is already registered in SendGrid or other email service provider
        # Only update if exists
        return await self.email_sender_handler.update_email_sender(tenant_id, email_sender)

    async def delete_email_sender(self, tenant_id: str):
        """delete email sender for tenant"""
        if not tenant_id:
            raise ValueError("tenant_id is required")
        
        return await self.email_sender_handler.delete_email_sender(tenant_id)