from flask import Blueprint, jsonify, request, current_app
from ..utils import get_db_connection

max_time_diff_bp = Blueprint('max_time_diff', __name__, url_prefix='/max_time_diff')

@max_time_diff_bp.route('/', strict_slashes=False)
def max_time_diff():
    start_date = request.args.get('start_date')
    end_date = request.args.get('end_date')
    start_time = request.args.get('start_time', '00:00')
    end_time = request.args.get('end_time', '23:59')

    if not start_date or not end_date:
        return jsonify({'error': 'Bitte sowohl Start- als auch End-Datum auswählen.'})

    conn = get_db_connection()
    cursor = conn.cursor()

    # Angepasste SQL-Abfrage
    query = """
    WITH time_differences AS (
        SELECT 
            create_time AS start_time,
            LEAD(create_time) OVER (ORDER BY create_time) AS end_time,
            TIMESTAMPDIFF(SECOND, create_time, LEAD(create_time) OVER (ORDER BY create_time)) AS time_diff
        FROM gi_debugger_entry
        WHERE webservice_id = %s
          AND create_time BETWEEN %s AND %s
    )
    SELECT start_time, end_time, time_diff
    FROM time_differences
    WHERE time_diff = (
        SELECT MAX(time_diff)
        FROM time_differences
    );
    """
    start_datetime = f"{start_date} {start_time}"
    end_datetime = f"{end_date} {end_time}"

    try:
        cursor.execute(query, (current_app.config['WEB_SERVICE_ID'], start_datetime, end_datetime))
        result = cursor.fetchone()
        conn.close()

        # Ergebnis zurückgeben
        if result and result[2] is not None:
            return jsonify({
                'max_time_diff_seconds': result[2],
                'start_time': result[0],
                'end_time': result[1]
            })
        else:
            return jsonify({
                'max_time_diff_seconds': 0,
                'start_time': None,
                'end_time': None
            })
    except Exception as e:
        conn.close()
        return jsonify({'error': str(e)})