import json
import datetime
import logging
from pathlib import Path

from bottle import route, run, request, response
from personal_data.csv_import import load_csv_file

logger = logging.getLogger("webserver")
logger.setLevel(logging.INFO)

def parse_time(time_str: str) -> datetime.datetime:
    """
    Parse a time string assuming ISO-8601 format.
    Adjust this parser if your CSV timestamps differ.
    """
    return datetime.datetime.fromisoformat(time_str)

@route('/newest')
def newest_entry():
    """
    Loads a CSV file (default: data.csv, overridable by query param 'file'),
    finds the newest entry based on the 'time.current' column, and returns it as JSON.
    """
    file_param = request.query.get("file", "data.csv")
    csv_path = Path(file_param)
    
    try:
        data = load_csv_file(csv_path)
    except Exception as e:
        logger.error(f"Error loading CSV file at {csv_path}: {e}")
        response.status = 500
        return {"error": f"Failed to load CSV: {str(e)}"}
    
    if not data:
        response.status = 404
        return {"error": "CSV file is empty or no data found"}
    
    try:
        newest = max(data, key=lambda r: parse_time(r['time.current']))
    except Exception as e:
        logger.error(f"Error processing CSV data: {e}")
        response.status = 500
        return {"error": f"Failed to process CSV data: {str(e)}"}
    
    response.content_type = "application/json"
    return json.dumps(newest)

if __name__ == '__main__':
    run(host='localhost', port=8080, debug=True)