import datetime
import json
import logging
from pathlib import Path

from bottle import request, response, route, run

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)