import google.generativeai as genai
from typing import Dict, Any
import asyncio
import sqlite3
import os
from datetime import datetime
from config import GEMINI_API_KEY

class LLMJobRefiner:
    def __init__(self):
        genai.configure(api_key=GEMINI_API_KEY)
        self.model = genai.GenerativeModel('gemini-latest-flash')
    
    async def refine_job_data(self, raw_data: Dict[str, Any], target_field: str) -> Dict[str, Any]:
        """
        Refine raw job data using Gemini LLM based on target field
        """
        prompt = f"""
        You are a job data extraction assistant. Extract the following fields from the job posting:
        - title
        - company_name
        - location
        - description
        - requirements
        - qualifications
        - salary_range
        - nature_of_work (remote, onsite, or hybrid)
        - job_id

        Target Field: {target_field}
        Raw Page Content:
        {raw_data.get('page_content', '')[:6000]}  # Limit content size

        Instructions:
        1. Extract only the information relevant to the target field: {target_field}
        2. Clean up any formatting issues in the description
        3. Standardize location format (city, state/country)
        4. Extract salary range if mentioned in description
        5. Determine nature of work (remote, onsite, or hybrid) from work arrangements
        6. Ensure all fields are properly formatted
        7. If a field cannot be found, use "N/A"
        8. Return the refined data in JSON format

        Response format (only return the JSON):
        {{
            "title": "...",
            "company_name": "...",
            "location": "...",
            "description": "...",
            "requirements": "...",
            "qualifications": "...",
            "salary_range": "...",
            "nature_of_work": "...",
            "job_id": "{raw_data.get('job_id', 'unknown')}",
            "url": "{raw_data.get('url', 'N/A')}"
        }}
        """
        
        try:
            response = await asyncio.get_event_loop().run_in_executor(
                None, 
                lambda: self.model.generate_content(prompt)
            )
            
            # Parse the response and return refined data
            refined_data = self._parse_llm_response(response.text)
            
            # If parsing fails, return None
            if not refined_data:
                return None
            
            return refined_data
            
        except Exception as e:
            print(f"LLM refinement failed: {str(e)}")
            return None
    
    def _parse_llm_response(self, response_text: str) -> Dict[str, Any]:
        """
        Parse the LLM response to extract refined job data
        """
        import json
        import re
        
        # Extract JSON from response (handle markdown code blocks)
        json_match = re.search(r'```(?:json)?\s*({.*?})\s*```', response_text, re.DOTALL)
        if json_match:
            json_str = json_match.group(1)
        else:
            # If no code block, try to find JSON directly
            json_match = re.search(r'\{.*\}', response_text, re.DOTALL)
            if json_match:
                json_str = json_match.group(0)
            else:
                return None
        
        try:
            return json.loads(json_str)
        except json.JSONDecodeError:
            return None
    
    async def save_job_data(self, job_data: Dict[str, Any], keyword: str):
        """
        Save job data to both markdown and database
        """
        # Save to database
        await self._save_to_db(job_data)
        
        # Save to markdown
        await self._save_to_markdown(job_data, keyword)
    
    async def _save_to_db(self, job_data: Dict[str, Any]):
        """
        Save job data to database
        """
        db_path = "linkedin_jobs.db"
        os.makedirs(os.path.dirname(db_path) if os.path.dirname(db_path) else ".", exist_ok=True)
        
        with sqlite3.connect(db_path) as conn:
            cursor = conn.cursor()
            cursor.execute('''
                INSERT OR IGNORE INTO jobs 
                (title, company_name, location, description, requirements, 
                 qualifications, salary_range, nature_of_work, job_id, url)
                VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
            ''', (
                job_data.get("title", "N/A"),
                job_data.get("company_name", "N/A"),
                job_data.get("location", "N/A"),
                job_data.get("description", "N/A"),
                job_data.get("requirements", "N/A"),
                job_data.get("qualifications", "N/A"),
                job_data.get("salary_range", "N/A"),
                job_data.get("nature_of_work", "N/A"),
                job_data.get("job_id", "N/A"),
                job_data.get("url", "N/A")
            ))
            conn.commit()
    
    async def _save_to_markdown(self, job_data: Dict[str, Any], keyword: str):
        """
        Save job data to markdown file
        """
        os.makedirs("linkedin_jobs", exist_ok=True)
        
        # Create a single markdown file for all jobs
        filename = "linkedin_jobs_scraped.md"
        filepath = os.path.join("linkedin_jobs", filename)
        
        with open(filepath, "a", encoding="utf-8") as f:
            # Only write header if file is empty
            if os.path.getsize(filepath) == 0:
                f.write(f"# LinkedIn Jobs - {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}\n\n")
            
            f.write(f"## Job: {job_data.get('title', 'N/A')}\n\n")
            f.write(f"- **Keyword**: {keyword}\n")
            f.write(f"- **Company**: {job_data.get('company_name', 'N/A')}\n")
            f.write(f"- **Location**: {job_data.get('location', 'N/A')}\n")
            f.write(f"- **Nature of Work**: {job_data.get('nature_of_work', 'N/A')}\n")
            f.write(f"- **Salary Range**: {job_data.get('salary_range', 'N/A')}\n")
            f.write(f"- **Job ID**: {job_data.get('job_id', 'N/A')}\n")
            f.write(f"- **URL**: <{job_data.get('url', 'N/A')}>\n\n")
            f.write(f"### Description\n\n{job_data.get('description', 'N/A')}\n\n")
            f.write(f"### Requirements\n\n{job_data.get('requirements', 'N/A')}\n\n")
            f.write(f"### Qualifications\n\n{job_data.get('qualifications', 'N/A')}\n\n")
            f.write("---\n\n")