import os
import base64
from datetime import datetime
import pytz
import sib_api_v3_sdk
from sib_api_v3_sdk.rest import ApiException

### Email Utility Functions ###

def load_email_template():
    """Load the HTML email template"""
    try:
        template_path = 'src/email_template/email_template.html'
        with open(template_path, 'r', encoding='utf-8') as file:
            return file.read()
    except FileNotFoundError:
        print("Email template file not found.")
        return None

def send_email(to_email, subject, html_content, to_name="Valued Customer", cc_list=None):
    """Send email using the Brevo (Sendinblue) API"""
    try:
        api_key = os.getenv("BREVO_API_KEY")
        if not api_key:
            raise Exception("BREVO_API_KEY environment variable not set.")

        configuration = sib_api_v3_sdk.Configuration()
        configuration.api_key["api-key"] = api_key

        api_instance = sib_api_v3_sdk.TransactionalEmailsApi(sib_api_v3_sdk.ApiClient(configuration))

        sender = {"name": "Blue Bean Data", "email": "info@bluebeandata.com"}
        to = [{"email": to_email, "name": to_name}]
        cc = []
        if cc_list:
            for cc_email in cc_list:
                cc.append({"email": cc_email})

        send_smtp_email = sib_api_v3_sdk.SendSmtpEmail(
            to=to,
            sender=sender,
            subject=subject,
            html_content=html_content,
            cc=cc if cc else None
        )

        try:
            response = api_instance.send_transac_email(send_smtp_email)
            return True
        except ApiException as e:
            print(f"Brevo API Exception: {e}")
            return False
    except Exception as e:
        print(f"Error sending email with Brevo: {str(e)}")
        return False

def _embed_logo_in_template(template):
    """Replaces the logo placeholder with a web-hosted image URL."""
    logo_url = "https://huggingface.co/spaces/krinya/bluebeandatachatbot/resolve/main/src/email_template/bluebeanlogo.png"
    return template.replace("__LOGO_SRC__", logo_url)

def send_user_welcome_email(email, name="Valued Customer", notes=""):
    """Send a welcome email to the user and a notification to the company."""
    try:
        template = load_email_template()
        if not template:
            return False
        
        template_with_logo = _embed_logo_in_template(template)

        # Handle name display - use generic greeting if no name provided
        if not name or name.strip().lower() in ['name not provided', 'not provided', '']:
            greeting = "Greetings,"
            display_name = "Valued Customer"
        else:
            greeting = f"Dear {name},"
            display_name = name

        # Build user info section dynamically
        user_info_items = [f"<li><b>Email:</b> {email}</li>"]
        
        if display_name != "Valued Customer":
            user_info_items.append(f"<li><b>Name:</b> {display_name}</li>")
        
        if notes and notes.strip() and notes.strip().lower() not in ['not provided', 'none', '']:
            # Format notes nicely for email display
            formatted_notes = notes.replace('\n', '<br>')
            user_info_items.append(f"<li><b>Conversation Context:</b> {formatted_notes}</li>")

        user_info_html = "\n                ".join(user_info_items)

        user_content = f"""
            <p>{greeting}</p>
            <p>Thank you for your interest in Blue Bean Data! We're excited to connect with you.</p>
            <p>Our team specializes in:</p>
            <ul>
                <li>Data Strategy & Consulting</li>
                <li>BI & Dashboards</li>
                <li>Data Pipeline Development</li>
                <li>AI & Automation</li>
            </ul>
            <p>We've received your details and will be in touch shortly. For your records, here is the information you provided:</p>
            <ul>
                {user_info_html}
            </ul>
            <p>Best regards,<br>The Blue Bean Data Team</p>
        """
        user_subject = "Thank You for Connecting with Blue Bean Data!"
        
        button_html = '<a href="www.bluebeandata.com" class="button">Visit Our Website</a>'
        
        user_html = template_with_logo.replace("__TITLE__", user_subject) \
                            .replace("__CONTENT__", user_content) \
                            .replace("__BUTTON_HTML__", button_html)
        
        company_email = os.getenv("COMPANY_EMAIL")
        cc_emails = [company_email] if company_email and company_email.lower() != email.lower() else []
        
        return send_email(email, user_subject, user_html, to_name=display_name, cc_list=cc_emails)
    except Exception as e:
        print(f"Error in send_user_welcome_email: {str(e)}")
        return False

def send_unknown_question_email(question):
    """Send an email to the company with a question the chatbot couldn't answer."""
    try:
        company_email = 'menyhert.kristof@gmail.com'
        if not company_email:
            print("COMPANY_EMAIL environment variable not set. Cannot send unknown question email.")
            return False
        
        template = load_email_template()
        if not template:
            return False
            
        template_with_logo = _embed_logo_in_template(template)

        amsterdam_tz = pytz.timezone('Europe/Amsterdam')
        timestamp = datetime.now(amsterdam_tz).strftime('%Y-%m-%d %H:%M:%S %Z')
        subject = "Chatbot Alert: Unknown Question"
        
        content = f"""
            <p><strong>The AI assistant was unable to answer the following question:</strong></p>
            <div style="background-color: #f8f9fa; padding: 15px; border-left: 4px solid #3364D1; margin: 15px 0;">
                <p style="font-style: italic; margin: 0;">"{question}"</p>
            </div>
            <p>This might be an opportunity to update the knowledge base or add new content to better serve future inquiries.</p>
            <p><small><b>Timestamp:</b> {timestamp}</small></p>
            <p>Best regards,<br>Blue Bean Data AI Assistant</p>
        """
        
        html_body = template_with_logo.replace("__TITLE__", subject) \
                            .replace("__CONTENT__", content) \
                            .replace("__BUTTON_HTML__", "")
                            
        return send_email('menyhert.kristof@gmail.com', subject, html_body, to_name="Blue Bean Data Team", cc_list=[company_email])
    except Exception as e:
        print(f"Error in send_unknown_question_email: {str(e)}")
        return False