"""
Email Agent Module.
Handles email-related tasks using Microsoft Graph API.
"""

import logging
import json
from typing import Dict, Any, List, Optional
from ..workflow.agentBase import AgentBase

logger = logging.getLogger(__name__)

class AgentEmail(AgentBase):
    """Agent for handling email-related tasks."""
    
    def __init__(self):
        """Initialize the email agent."""
        super().__init__()
        self.name = "email"
        self.label = "Email Agent"
        self.description = "Handles email composition and sending using Microsoft Graph API"
        self.capabilities = [
            "email_composition",
            "email_draft_creation",
            "email_template_generation"
        ]
        self.serviceBase = None
    
    def setDependencies(self, serviceBase=None):
        """Set external dependencies for the agent."""
        self.serviceBase = serviceBase
    
    async def processTask(self, task: Dict[str, Any]) -> Dict[str, Any]:
        """
        Process an email-related task.
        
        Args:
            task: Task object containing:
                - prompt: Instructions for the agent
                - inputDocuments: List of documents to process
                - outputSpecifications: List of required output documents
                - context: Additional context including workflow info
        
        Returns:
            Dictionary containing:
                - feedback: Text response explaining what was done
                - documents: List of created documents
        """
        try:
            # Extract task information
            prompt = task.get("prompt", "")
            inputDocuments = task.get("inputDocuments", [])
            outputSpecs = task.get("outputSpecifications", [])
            
            # Check AI service
            if not self.service.base:
                return {
                    "feedback": "The Email agent requires an AI service to function.",
                    "documents": []
                }
            
            # Check if Microsoft connector is available
            if not hasattr(self.service, 'msft'):
                return {
                    "feedback": "Microsoft connector not available. Please ensure Microsoft integration is properly configured.",
                    "documents": []
                }
            
            # Get Microsoft token
            token_data = self.service.msft.getMsftToken()
            if not token_data:
                # Create authentication trigger document
                auth_doc = self._createFrontendAuthTriggerDocument()
                return {
                    "feedback": "Microsoft authentication required. Please authenticate to continue.",
                    "documents": [auth_doc]
                }
            
            # Extract document data from input
            documentContents, attachments = self._processInputDocuments(inputDocuments)
            
            # Generate email subject and body using AI
            emailTemplate = await self._generateEmailTemplate(prompt, documentContents)
            
            # Create HTML preview of the email
            htmlPreview = self._createHtmlPreview(emailTemplate)
            
            # Attempt to create a draft email using Microsoft Graph API
            draft_result = self.service.msft.createDraftEmail(
                emailTemplate["recipient"],
                emailTemplate["subject"],
                emailTemplate["htmlBody"],
                attachments
            )
            
            # Prepare output documents
            documents = []
            
            # Process output specifications
            for spec in outputSpecs:
                label = spec.get("label", "")
                description = spec.get("description", "")
                
                if label.endswith(".html"):
                    # Create the HTML template file
                    templateDoc = self.formatAgentDocumentOutput(
                        label,
                        emailTemplate["htmlBody"],  # Use the actual HTML body, not the preview
                        "text/html"
                    )
                    documents.append(templateDoc)
                elif label.endswith(".json"):
                    # Create JSON template if requested
                    templateJson = json.dumps(emailTemplate, indent=2)
                    templateDoc = self.formatAgentDocumentOutput(
                        label,
                        templateJson,
                        "application/json"
                    )
                    documents.append(templateDoc)
                else:
                    # Default to preview for other cases
                    previewDoc = self.formatAgentDocumentOutput(
                        label,
                        htmlPreview,
                        "text/html"
                    )
                    documents.append(previewDoc)
            
            # Prepare feedback message
            if draft_result:
                feedback = f"Email draft created successfully for {emailTemplate.get('recipient')}. The subject is: '{emailTemplate['subject']}'"
                if attachments:
                    feedback += f" with {len(attachments)} attachment(s)"
                feedback += ". You can open and edit it in your Outlook draft folder."
            else:
                feedback = "Email template created but could not save as draft. HTML preview and template are available as documents."
            
            return {
                "feedback": feedback,
                "documents": documents
            }
            
        except Exception as e:
            logger.error(f"Error in email agent: {str(e)}")
            return {
                "feedback": f"Error processing email task: {str(e)}",
                "documents": []
            }
    
    def _createFrontendAuthTriggerDocument(self) -> Dict[str, Any]:
        """Create a document that triggers Microsoft authentication in the frontend."""
        return {
            "name": "microsoft_auth",
            "ext": "html",
            "mimeType": "text/html",
            "data": """
            <div>
                <h2>Microsoft Authentication Required</h2>
                <p>Please click the button below to authenticate with Microsoft:</p>
                <button onclick="window.location.href='/api/auth/microsoft'">Authenticate with Microsoft</button>
            </div>
            """,
            "base64Encoded": False,
            "metadata": {
                "isText": True
            }
        }
    
    def _processInputDocuments(self, input_docs: List[Dict[str, Any]]) -> tuple:
        """
        Process input documents to extract content and prepare attachments.
        
        Args:
            input_docs: List of input documents
            
        Returns:
            Tuple of (document content text, list of attachments)
        """
        documentContents = []
        attachments = []
        
        for doc in input_docs:
            docName = doc.get("name", "unnamed")
            if doc.get("ext"):
                docName = f"{docName}.{doc.get('ext')}"
            
            # Add document name to contents
            documentContents.append(f"\n\n--- {docName} ---\n")
            
            # Process document data directly
            if doc.get("data"):
                # Add to attachments with proper metadata
                attachments.append({
                    "name": docName,
                    "document": {
                        "data": doc["data"],
                        "mimeType": doc.get("mimeType", "application/octet-stream"),
                        "base64Encoded": doc.get("base64Encoded", False)
                    }
                })
                documentContents.append(f"Document attached: {docName}")
            else:
                documentContents.append(f"Document referenced: {docName}")
        
        return "\n".join(documentContents), attachments
    
    async def _generateEmailTemplate(self, prompt: str, documentContents: str) -> Dict[str, Any]:
        """
        Generate email template using AI.
        
        Args:
            prompt: The task prompt
            documentContents: Extracted document content
            
        Returns:
            Email template dictionary with recipient, subject, body
        """
        emailPrompt = f"""
        Create an email based on the following request:
        
        REQUEST: {prompt}
        
        DOCUMENT CONTENTS:
        {documentContents[:2000]}... (truncated if longer)
        
        Generate an email template with:
        1. A relevant recipient (use placeholder or derive from content if possible)
        2. A concise but descriptive subject line
        3. A professional HTML-formatted email body
        4. Appropriate greeting and closing
        
        Format your response as JSON with these fields:
        - recipient: email address
        - subject: subject line
        - plainBody: plain text version
        - htmlBody: HTML formatted version
        
        Only return valid JSON. No preamble or explanations.
        """
        
        try:
            response = await self.service.base.callAi([
                {"role": "system", "content": "You are an email template specialist. Create professional emails. Respond with valid JSON only."},
                {"role": "user", "content": emailPrompt}
            ])
            
            # Extract JSON from response
            jsonStart = response.find('{')
            jsonEnd = response.rfind('}') + 1
            
            if jsonStart >= 0 and jsonEnd > jsonStart:
                template = json.loads(response[jsonStart:jsonEnd])
                return template
            else:
                # Fallback plan
                logger.warning(f"Not able creating email template, generating fallback plan")
                return {
                    "recipient": "recipient@example.com",
                    "subject": "Information Regarding Your Request",
                    "plainBody": f"This email is regarding your request: {prompt}",
                    "htmlBody": f"<html><body><p>This email is regarding your request: {prompt}</p></body></html>"
                }
            
        except Exception as e:
            logger.warning(f"Error generating email template: {str(e)}")
            return {
                "recipient": "recipient@example.com",
                "subject": "Information Regarding Your Request",
                "plainBody": f"This email is regarding your request: {prompt}",
                "htmlBody": f"<html><body><p>This email is regarding your request: {prompt}</p></body></html>"
            }
    
    def _createHtmlPreview(self, emailTemplate: Dict[str, Any]) -> str:
        """
        Create an HTML preview of the email template.
        
        Args:
            emailTemplate: Email template dictionary
            
        Returns:
            HTML string for preview
        """
        html = f"""
        <!DOCTYPE html>
        <html>
        <head>
            <meta charset="UTF-8">
            <title>Email Preview: {emailTemplate.get('subject', 'Email Template')}</title>
            <style>
                body {{ font-family: Arial, sans-serif; margin: 0; padding: 0; background-color: #f5f5f5; }}
                .email-container {{ max-width: 600px; margin: 20px auto; background-color: white; border: 1px solid #ddd; border-radius: 5px; overflow: hidden; }}
                .email-header {{ background-color: #f0f0f0; padding: 15px; border-bottom: 1px solid #ddd; }}
                .email-content {{ padding: 20px; }}
                .email-footer {{ background-color: #f0f0f0; padding: 15px; border-top: 1px solid #ddd; font-size: 12px; color: #666; }}
                .field {{ margin-bottom: 10px; }}
                .field-label {{ font-weight: bold; color: #555; }}
                .email-body {{ margin-top: 20px; padding-top: 20px; border-top: 1px solid #eee; }}
            </style>
        </head>
        <body>
            <div class="email-container">
                <div class="email-header">
                    <h2>Email Template Preview</h2>
                </div>
                <div class="email-content">
                    <div class="field">
                        <div class="field-label">To:</div>
                        <div>{emailTemplate.get('recipient', 'recipient@example.com')}</div>
                    </div>
                    <div class="field">
                        <div class="field-label">Subject:</div>
                        <div>{emailTemplate.get('subject', 'No Subject')}</div>
                    </div>
                    <div class="email-body">
                        {emailTemplate.get('htmlBody', '<p>No content</p>')}
                    </div>
                </div>
                <div class="email-footer">
                    <p>This is a preview of the email template. The actual email may appear differently in various email clients.</p>
                </div>
            </div>
        </body>
        </html>
        """
        return html

def getAgentEmail() -> AgentEmail:
    """Factory function to create and return an EmailAgent instance."""
    return AgentEmail()