"""
Personalized Email Generator
Creates truly personalized emails by matching CLIENT offerings with PROSPECT needs
"""
import logging
from typing import Dict, Optional

logger = logging.getLogger(__name__)


class PersonalizedEmailGenerator:
    """Generates personalized B2B emails based on client-prospect fit"""

    def generate_email(
        self,
        client_profile: Dict,
        prospect_profile: Dict,
        contact: Dict
    ) -> Dict:
        """
        Generate highly personalized email

        Args:
            client_profile: CLIENT company info (what they offer)
            prospect_profile: PROSPECT company info (their pain points)
            contact: Decision maker contact info (name, title, email)

        Returns:
            {
                'subject': str,
                'body': str,
                'to': str,
                'from': str
            }
        """
        print(f"\n[EMAIL GEN] Generating personalized email")
        print(f"[EMAIL GEN] Client: {client_profile.get('name')}")
        print(f"[EMAIL GEN] Prospect: {prospect_profile.get('name')}")
        print(f"[EMAIL GEN] Contact: {contact.get('name')} ({contact.get('title')})")

        # Extract key information
        client_name = client_profile.get('name', 'Our Company')
        prospect_name = prospect_profile.get('name', 'Your Company')
        contact_name = contact.get('name', 'Hello')
        contact_title = contact.get('title', 'Team Member')
        contact_email = contact.get('email', 'contact@example.com')

        # Get first name for greeting
        first_name = contact_name.split()[0] if contact_name and contact_name != 'Hello' else 'there'

        # Get client offerings
        client_offerings = client_profile.get('offerings', [])
        client_value_props = client_profile.get('value_propositions', [])
        client_description = client_profile.get('description', '')

        # Get prospect details
        prospect_pains = prospect_profile.get('pain_points', [])
        prospect_industry = prospect_profile.get('industry', 'your industry')
        prospect_size = prospect_profile.get('size', 'your company size')

        # Create subject line
        subject = self._generate_subject(
            client_name,
            prospect_name,
            prospect_industry,
            contact_title
        )

        # Create personalized body
        body = self._generate_body(
            client_name=client_name,
            client_description=client_description,
            client_offerings=client_offerings,
            client_value_props=client_value_props,
            prospect_name=prospect_name,
            prospect_industry=prospect_industry,
            prospect_size=prospect_size,
            prospect_pains=prospect_pains,
            contact_first_name=first_name,
            contact_title=contact_title
        )

        # Determine from address
        client_domain = client_profile.get('domain', 'example.com')
        from_email = f"partnerships@{client_domain}" if client_domain else "partnerships@example.com"

        result = {
            'subject': subject,
            'body': body,
            'to': contact_email,
            'from': from_email,
            'client': client_name,
            'prospect': prospect_name,
            'contact': contact_name
        }

        print(f"[EMAIL GEN] Subject: {subject}")
        print(f"[EMAIL GEN] To: {contact_email}")
        print(f"[EMAIL GEN] Email generated successfully\n")

        return result

    def _generate_subject(
        self,
        client_name: str,
        prospect_name: str,
        industry: str,
        title: str
    ) -> str:
        """Generate personalized subject line"""

        # Subject templates based on title
        if 'CEO' in title or 'Founder' in title:
            return f"{prospect_name} + {client_name}: Scaling {industry} Operations"
        elif 'VP' in title or 'Chief' in title:
            return f"Helping {prospect_name} Improve Customer Experience"
        elif 'Director' in title or 'Head' in title:
            return f"Quick question about {prospect_name}'s customer strategy"
        else:
            return f"{prospect_name}: Customer Experience Partnership"

    def _generate_body(
        self,
        client_name: str,
        client_description: str,
        client_offerings: list,
        client_value_props: list,
        prospect_name: str,
        prospect_industry: str,
        prospect_size: str,
        prospect_pains: list,
        contact_first_name: str,
        contact_title: str
    ) -> str:
        """Generate personalized email body"""

        # Opening - personalized greeting
        opening = f"Hi {contact_first_name},"

        # Introduction - acknowledge their role
        if 'CEO' in contact_title or 'Founder' in contact_title:
            intro = f"\n\nAs {contact_title} of {prospect_name}, you're likely focused on scaling operations while maintaining quality."
        elif 'VP' in contact_title or 'Chief' in contact_title:
            intro = f"\n\nAs {contact_title}, you're probably looking for ways to improve {prospect_name}'s customer experience and operational efficiency."
        else:
            intro = f"\n\nI wanted to reach out regarding {prospect_name}'s customer experience strategy."

        # Client intro - what they do
        if client_description:
            client_intro = f"\n\n{client_name} {client_description[:200]}"
        elif client_offerings:
            client_intro = f"\n\n{client_name} provides {client_offerings[0][:150]}"
        else:
            client_intro = f"\n\n{client_name} helps {prospect_industry} companies improve their operations."

        # Value proposition - match with prospect needs
        value_section = "\n\nWe've helped similar companies"

        if prospect_pains and len(prospect_pains) > 0:
            # Use actual pain points
            main_pain = prospect_pains[0]
            value_section += f" tackle challenges like:\n• {main_pain}"

            # Add more if available
            if len(prospect_pains) > 1:
                value_section += f"\n• {prospect_pains[1]}"
        elif client_value_props:
            # Use client value props
            value_section += ":\n"
            for prop in client_value_props[:2]:
                if len(prop) < 150:
                    value_section += f"• {prop}\n"
        else:
            # Generic fallback
            value_section += " improve customer satisfaction and operational efficiency."

        # Call to action
        if prospect_size and 'employee' in str(prospect_size).lower():
            cta = f"\n\nGiven {prospect_name}'s size and growth trajectory, I think there might be a good fit here."
        else:
            cta = f"\n\nI think there might be a good fit between {client_name} and {prospect_name}."

        cta += f"\n\nWould you have 15 minutes next week for a quick call to explore if we can help {prospect_name}?"

        # Sign off
        signoff = f"\n\nBest regards,\n{client_name} Partnerships Team"

        # Footer
        footer = f"\n\n---\nThis email was sent on behalf of {client_name}.\nTo unsubscribe, reply with \"unsubscribe\"."

        # Combine all parts
        body = opening + intro + client_intro + value_section + cta + signoff + footer

        return body


# Singleton
_email_generator = None


def get_email_generator() -> PersonalizedEmailGenerator:
    """Get singleton instance"""
    global _email_generator
    if _email_generator is None:
        _email_generator = PersonalizedEmailGenerator()
    return _email_generator