# file: agents/writer.py
import json
import re
import logging
from typing import AsyncGenerator
from app.schema import Prospect
from app.config import MODEL_NAME, HF_API_TOKEN, MODEL_NAME_FALLBACK
from app.logging_utils import log_event
from vector.retriever import Retriever
from huggingface_hub import AsyncInferenceClient

logger = logging.getLogger(__name__)

class Writer:
    """Generates outreach content with HuggingFace Inference API streaming"""

    def __init__(self, mcp_registry):
        self.mcp = mcp_registry
        self.store = mcp_registry.get_store_client()
        self.retriever = Retriever()
        # Initialize HF client
        self.hf_client = AsyncInferenceClient(token=HF_API_TOKEN if HF_API_TOKEN else None)
    
    async def run_streaming(self, prospect: Prospect) -> AsyncGenerator[dict, None]:
        """Generate content with streaming tokens"""

        # IMPORTANT: Log contact information for debugging
        if prospect.contacts:
            for contact in prospect.contacts:
                log_event("writer", f"Using contact: {contact.name} ({contact.title}) - {contact.email}", "agent_log")
                logger.info(f"Writer: Using contact: {contact.name} ({contact.title}) - {contact.email}")
        else:
            log_event("writer", "WARNING: No contacts found for this prospect!", "agent_log")
            logger.warning(f"Writer: No contacts found for prospect {prospect.company.name}")

        # Get relevant facts from vector store
        try:
            relevant_facts = self.retriever.retrieve(prospect.company.id, k=5)
        except:
            relevant_facts = []
        
        # Build comprehensive context
        context = f"""
COMPANY PROFILE:
Name: {prospect.company.name}
Industry: {prospect.company.industry}
Size: {prospect.company.size} employees
Domain: {prospect.company.domain}

KEY CHALLENGES:
{chr(10).join(f'• {pain}' for pain in prospect.company.pains)}

BUSINESS CONTEXT:
{chr(10).join(f'• {note}' for note in prospect.company.notes) if prospect.company.notes else '• No additional notes'}

RELEVANT INSIGHTS:
{chr(10).join(f'• {fact["text"]} (confidence: {fact.get("score", 0.7):.2f})' for fact in relevant_facts[:3]) if relevant_facts else '• Industry best practices suggest focusing on customer experience improvements'}
"""
        
        # Generate comprehensive summary first
        summary_prompt = f"""{context}

Generate a comprehensive bullet-point summary for {prospect.company.name} that includes:
1. Company overview (industry, size)
2. Main challenges they face
3. Specific opportunities for improvement
4. Recommended actions

Format: Use 5-7 bullets, each starting with "•". Be specific and actionable.
Include the industry and size context in your summary."""
        
        summary_text = ""

        # Emit company header first
        yield log_event("writer", f"Generating content for {prospect.company.name}", "company_start",
                       {"company": prospect.company.name,
                        "industry": prospect.company.industry,
                        "size": prospect.company.size})

        # Summary generation with HF Inference API
        try:
            # Use text generation with streaming
            stream = await self.hf_client.text_generation(
                summary_prompt,
                model=MODEL_NAME,
                max_new_tokens=500,
                temperature=0.7,
                stream=True
            )

            async for token in stream:
                summary_text += token
                yield log_event(
                    "writer",
                    token,
                    "llm_token",
                    {
                        "type": "summary",
                        "token": token,
                        "prospect_id": prospect.id,
                        "company_id": prospect.company.id,
                        "company_name": prospect.company.name,
                    },
                )

        except Exception as e:
            # Fallback summary if generation fails
            summary_text = f"""• {prospect.company.name} is a {prospect.company.industry} company with {prospect.company.size} employees
• Main challenge: {prospect.company.pains[0] if prospect.company.pains else 'Customer experience improvement'}
• Opportunity: Implement modern CX solutions to improve customer satisfaction
• Recommended action: Schedule a consultation to discuss specific needs"""
            yield log_event("writer", f"Summary generation failed, using default: {e}", "llm_error")
        
        # Generate personalized email
        # If we have a contact, instruct the greeting explicitly with name and title
        greeting_hint = ""
        contact_context = ""
        if prospect.contacts:
            contact = prospect.contacts[0]
            first_name = (contact.name or "").split()[0]
            full_name = contact.name
            title = contact.title

            if first_name:
                greeting_hint = f"IMPORTANT: Start the email EXACTLY with this greeting: 'Hi {first_name},'\n"
                contact_context = f"\nTARGET RECIPIENT:\nName: {full_name}\nTitle: {title}\nEmail: {contact.email}\n"

        email_prompt = f"""{context}
{contact_context}
Company Summary:
{summary_text}

Write a highly personalized outreach email from a CX AI platform provider to {prospect.contacts[0].name if prospect.contacts else 'leaders'} at {prospect.company.name}.
{greeting_hint}
Requirements:
- Subject line that mentions their company name and industry
- Body: 150-180 words, professional and friendly
- Reference their specific industry ({prospect.company.industry}) and size ({prospect.company.size} employees)
- Address them by their first name in the greeting (e.g., "Hi {prospect.contacts[0].name.split()[0] if prospect.contacts else 'there'},")
- Acknowledge their role as {prospect.contacts[0].title if prospect.contacts else 'a leader'} in the organization
- Clearly connect their challenges to AI-powered customer experience solutions
- One clear call-to-action to schedule a short conversation or demo next week
- Do not write as if the email is from the company to us
- No exaggerated claims
- Sign off as: "The CX Team"

Format response exactly as:
Subject: [subject line]
Body: [email body]
"""
        
        email_text = ""
        
        # Emit email generation start
        yield log_event("writer", f"Generating email for {prospect.company.name}", "email_start",
                       {"company": prospect.company.name})

        # Email generation with HF Inference API
        try:
            stream = await self.hf_client.text_generation(
                email_prompt,
                model=MODEL_NAME,
                max_new_tokens=400,
                temperature=0.7,
                stream=True
            )

            async for token in stream:
                email_text += token
                yield log_event(
                    "writer",
                    token,
                    "llm_token",
                    {
                        "type": "email",
                        "token": token,
                        "prospect_id": prospect.id,
                        "company_id": prospect.company.id,
                        "company_name": prospect.company.name,
                    },
                )

        except Exception as e:
            # Fallback email if generation fails - use contact name if available
            contact_greeting = "Hi there,"
            if prospect.contacts:
                first_name = prospect.contacts[0].name.split()[0] if prospect.contacts[0].name else "there"
                contact_greeting = f"Hi {first_name},"

            email_text = f"""Subject: Improve {prospect.company.name}'s Customer Experience

Body: {contact_greeting}

As a {prospect.company.industry} company with {prospect.company.size} employees, you face unique customer experience challenges. We understand that {prospect.company.pains[0] if prospect.company.pains else 'improving customer satisfaction'} is a priority for your organization.

Our AI-powered platform has helped similar companies in the {prospect.company.industry} industry improve their customer experience metrics significantly. We'd love to discuss how we can help {prospect.company.name} achieve similar results.

Would you be available for a brief call next week to explore how we can address your specific needs?

Best regards,
The CX Team"""
            yield log_event("writer", f"Email generation failed, using default: {e}", "llm_error")
        
        # Parse email
        email_parts = {"subject": "", "body": ""}
        if "Subject:" in email_text and "Body:" in email_text:
            parts = email_text.split("Body:")
            email_parts["subject"] = parts[0].replace("Subject:", "").strip()
            email_parts["body"] = parts[1].strip()
        else:
            # Fallback with company details - personalize with contact name
            contact_greeting = "Hi there,"
            if prospect.contacts:
                first_name = prospect.contacts[0].name.split()[0] if prospect.contacts[0].name else "there"
                contact_greeting = f"Hi {first_name},"

            email_parts["subject"] = f"Transform {prospect.company.name}'s Customer Experience"
            email_parts["body"] = email_text or f"""{contact_greeting}

As a leading {prospect.company.industry} company with {prospect.company.size} employees, we know you're focused on delivering exceptional customer experiences.

We'd like to discuss how our AI-powered platform can help address your specific challenges and improve your customer satisfaction metrics.

Best regards,
The CX Team"""

        # Replace any placeholder tokens like [Team Name] with actual contact name if available
        if prospect.contacts:
            contact_name = prospect.contacts[0].name
            if email_parts.get("subject"):
                email_parts["subject"] = re.sub(r"\[[^\]]+\]", contact_name, email_parts["subject"])
            if email_parts.get("body"):
                email_parts["body"] = re.sub(r"\[[^\]]+\]", contact_name, email_parts["body"])

        # Update prospect
        prospect.summary = f"**{prospect.company.name} ({prospect.company.industry}, {prospect.company.size} employees)**\n\n{summary_text}"
        prospect.email_draft = email_parts
        prospect.status = "drafted"
        await self.store.save_prospect(prospect)
        
        # Emit completion event with company info
        yield log_event(
            "writer",
            f"Generation complete for {prospect.company.name}",
            "llm_done",
            {
                "prospect": prospect,
                "summary": prospect.summary,
                "email": email_parts,
                "company_name": prospect.company.name,
                "prospect_id": prospect.id,
                "company_id": prospect.company.id,
            },
        )
    
    async def run(self, prospect: Prospect) -> Prospect:
        """Non-streaming version for compatibility"""
        async for event in self.run_streaming(prospect):
            if event["type"] == "llm_done":
                return event["payload"]["prospect"]
        return prospect