# File: prompts.py

DOCUMENT_OUTLINE_PROMPT_SYSTEM = """You are a document generator. Provide the outline of the document requested in <prompt></prompt> in JSON format.
Include sections and subsections if required. Use the "Content" field to provide a specific prompt or instruction for generating content for that particular section or subsection.

OUTPUT IN FOLLOWING JSON FORMAT enclosed in <output> tags
<output>
{
    "Document": {
      "Title": "Document Title",
      "Author": "Author Name",
      "Date": "YYYY-MM-DD",
      "Version": "1.0",

      "Sections": [
        {
          "SectionNumber": "1",
          "Title": "Section Title",
          "Content": "Specific prompt or instruction for generating content for this section",
          "Subsections": [
            {
              "SectionNumber": "1.1",
              "Title": "Subsection Title",
              "Content": "Specific prompt or instruction for generating content for this subsection"
            }
          ]
        }
      ]
    }
  }
</output>"""

DOCUMENT_OUTLINE_PROMPT_USER = """<prompt>{query}</prompt>"""

DOCUMENT_SECTION_PROMPT_SYSTEM = """You are a document generator, You need to output only the content requested in the section in the prompt.
FORMAT YOUR OUTPUT AS MARKDOWN ENCLOSED IN <response></response> tags
<overall_objective>{overall_objective}</overall_objective>
<document_layout>{document_layout}</document_layout>"""

DOCUMENT_SECTION_PROMPT_USER = """<prompt>Output the content for the section "{section_or_subsection_title}" formatted as markdown. Follow this instruction: {content_instruction}</prompt>"""

# File: app.py

import os
import json
import re
from typing import List, Dict, Optional, Any, Callable
from openai import OpenAI
import logging
import functools
from fastapi import APIRouter, HTTPException
from pydantic import BaseModel
#from prompts import *

logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)

def log_execution(func: Callable) -> Callable:
    @functools.wraps(func)
    def wrapper(*args: Any, **kwargs: Any) -> Any:
        logger.info(f"Executing {func.__name__}")
        try:
            result = func(*args, **kwargs)
            logger.info(f"{func.__name__} completed successfully")
            return result
        except Exception as e:
            logger.error(f"Error in {func.__name__}: {e}")
            raise
    return wrapper

class AIClient:
    def __init__(self):
        self.client = OpenAI(
            base_url="https://openrouter.ai/api/v1",
            api_key=os.environ['OPENROUTER_API_KEY']
        )

    @log_execution
    def generate_response(
        self,
        messages: List[Dict[str, str]],
        model: str = "openai/gpt-4o-mini",
        max_tokens: int = 32000
    ) -> Optional[str]:
        if not messages:
            return None
        response = self.client.chat.completions.create(
            model=model,
            messages=messages,
            max_tokens=max_tokens,
            stream=False
        )
        return response.choices[0].message.content

class DocumentGenerator:
    def __init__(self, ai_client: AIClient):
        self.ai_client = ai_client
        self.document_outline = None
        self.content_messages = []

    @staticmethod
    def extract_between_tags(text: str, tag: str) -> str:
        pattern = f"<{tag}>(.*?)</{tag}>"
        match = re.search(pattern, text, re.DOTALL)
        return match.group(1).strip() if match else ""

    @staticmethod
    def remove_duplicate_title(content: str, title: str, section_number: str) -> str:
        patterns = [
            rf"^#+\s*{re.escape(section_number)}(?:\s+|\s*:\s*|\.\s*){re.escape(title)}",
            rf"^#+\s*{re.escape(title)}",
            rf"^{re.escape(section_number)}(?:\s+|\s*:\s*|\.\s*){re.escape(title)}",
            rf"^{re.escape(title)}",
        ]
        
        for pattern in patterns:
            content = re.sub(pattern, "", content, flags=re.MULTILINE | re.IGNORECASE)
        
        return content.lstrip()

    @log_execution
    def generate_document_outline(self, query: str, max_retries: int = 3) -> Optional[Dict]:
        messages = [
            {"role": "system", "content": DOCUMENT_OUTLINE_PROMPT_SYSTEM},
            {"role": "user", "content": DOCUMENT_OUTLINE_PROMPT_USER.format(query=query)}
        ]
        
        for attempt in range(max_retries):
            outline_response = self.ai_client.generate_response(messages, model="openai/gpt-4o")
            outline_json_text = self.extract_between_tags(outline_response, "output")
            
            try:
                self.document_outline = json.loads(outline_json_text)
                return self.document_outline
            except json.JSONDecodeError as e:
                if attempt < max_retries - 1:
                    logger.warning(f"Failed to parse JSON (attempt {attempt + 1}): {e}")
                    logger.info("Retrying...")
                else:
                    logger.error(f"Failed to parse JSON after {max_retries} attempts: {e}")
                    return None

    @log_execution
    def generate_content(self, title: str, content_instruction: str, section_number: str) -> str:
        self.content_messages.append({
            "role": "user",
            "content": DOCUMENT_SECTION_PROMPT_USER.format(
                section_or_subsection_title=title,
                content_instruction=content_instruction
            )
        })
        section_response = self.ai_client.generate_response(self.content_messages)
        content = self.extract_between_tags(section_response, "response")
        content = self.remove_duplicate_title(content, title, section_number)
        self.content_messages.append({
            "role": "assistant",
            "content": section_response
        })
        return content

    @log_execution
    def generate_document(self, query: str) -> Dict:
        self.generate_document_outline(query)
        
        if self.document_outline is None:
            raise ValueError("Failed to generate a valid document outline")

        overall_objective = query
        document_layout = json.dumps(self.document_outline, indent=2)

        self.content_messages = [
            {
                "role": "system",
                "content": DOCUMENT_SECTION_PROMPT_SYSTEM.format(
                    overall_objective=overall_objective,
                    document_layout=document_layout
                )
            }
        ]

        for section in self.document_outline["Document"].get("Sections", []):
            section_title = section.get("Title", "")
            section_number = section.get("SectionNumber", "")
            content_instruction = section.get("Content", "")
            logger.info(f"Generating content for section: {section_title}")
            section["Content"] = self.generate_content(section_title, content_instruction, section_number)

            for subsection in section.get("Subsections", []):
                subsection_title = subsection.get("Title", "")
                subsection_number = subsection.get("SectionNumber", "")
                subsection_content_instruction = subsection.get("Content", "")
                logger.info(f"Generating content for subsection: {subsection_title}")
                subsection["Content"] = self.generate_content(subsection_title, subsection_content_instruction, subsection_number)

        return self.document_outline


class MarkdownConverter:
    @staticmethod
    def slugify(text: str) -> str:
        return re.sub(r'\W+', '-', text.lower())

    @classmethod
    def generate_toc(cls, sections: List[Dict]) -> str:
        toc = "<div style='page-break-before: always;'></div>\n\n"
        toc += "<h2 style='color: #2c3e50; text-align: center;'>Table of Contents</h2>\n\n"
        toc += "<nav style='background-color: #f8f9fa; padding: 20px; border-radius: 5px; line-height: 1.6;'>\n\n"
        for section in sections:
            section_number = section['SectionNumber']
            section_title = section['Title']
            toc += f"<p><a href='#{cls.slugify(section_title)}' style='color: #3498db; text-decoration: none;'>{section_number}. {section_title}</a></p>\n\n"
            
            for subsection in section.get('Subsections', []):
                subsection_number = subsection['SectionNumber']
                subsection_title = subsection['Title']
                toc += f"<p style='margin-left: 20px;'><a href='#{cls.slugify(subsection_title)}' style='color: #2980b9; text-decoration: none;'>{subsection_number} {subsection_title}</a></p>\n\n"
        
        toc += "</nav>\n\n"
        return toc

    @classmethod
    def convert_to_markdown(cls, document: Dict) -> str:
        # First page with centered content
        markdown = "<div style='text-align: center; padding-top: 33vh;'>\n\n"
        markdown += f"<h1 style='color: #2c3e50; border-bottom: 2px solid #3498db; padding-bottom: 10px; display: inline-block;'>{document['Title']}</h1>\n\n"
        markdown += f"<p style='color: #7f8c8d;'><em>By {document['Author']}</em></p>\n\n"
        markdown += f"<p style='color: #95a5a6;'>Version {document['Version']} | {document['Date']}</p>\n\n"
        markdown += "</div>\n\n"
        
        # Table of Contents on the second page
        markdown += cls.generate_toc(document['Sections'])
        
        # Main content
        markdown += "<div style='max-width: 800px; margin: 0 auto; font-family: \"Segoe UI\", Arial, sans-serif; line-height: 1.6;'>\n\n"
        
        for section in document['Sections']:
            markdown += "<div style='page-break-before: always;'></div>\n\n"
            section_number = section['SectionNumber']
            section_title = section['Title']
            markdown += f"<h2 id='{cls.slugify(section_title)}' style='color: #2c3e50; border-bottom: 1px solid #bdc3c7; padding-bottom: 5px;'>{section_number}. {section_title}</h2>\n\n"
            markdown += f"<div style='color: #34495e; margin-bottom: 20px;'>\n\n{section['Content']}\n\n</div>\n\n"
            
            for subsection in section.get('Subsections', []):
                subsection_number = subsection['SectionNumber']
                subsection_title = subsection['Title']
                markdown += f"<h3 id='{cls.slugify(subsection_title)}' style='color: #34495e;'>{subsection_number} {subsection_title}</h3>\n\n"
                markdown += f"<div style='color: #34495e; margin-bottom: 20px;'>\n\n{subsection['Content']}\n\n</div>\n\n"
        
        markdown += "</div>"
        return markdown
        

router = APIRouter()

class DocumentRequest(BaseModel):
    query: str

class DocumentResponse(BaseModel):
    json_document: Dict
    markdown_document: str

@router.post("/generate-document", response_model=DocumentResponse)
async def generate_document_endpoint(request: DocumentRequest):
    ai_client = AIClient()
    document_generator = DocumentGenerator(ai_client)
    
    try:
        # Generate the document
        json_document = document_generator.generate_document(request.query)
        
        # Convert to Markdown
        markdown_document = MarkdownConverter.convert_to_markdown(json_document["Document"])
        
        return DocumentResponse(
            json_document=json_document,
            markdown_document=markdown_document
        )
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))