from flask import Blueprint, request, jsonify
from datetime import datetime, timezone
from util.logger import logger
from util.db_pool import get_connection
from auth.token import verify_token

notes_blueprint = Blueprint('notes_tool', __name__)


@notes_blueprint.route('/api/notes', methods=['GET'])
def get_notes():
    user = verify_token()
    if not user:
        return jsonify({"message": "Nicht autorisiert"}), 401
    try:
        conn = get_connection()
        try:
            cursor = conn.cursor(dictionary=True)
            cursor.execute(
                "SELECT id, title, content, language, created_at, updated_at "
                "FROM notes WHERE user_id = %s ORDER BY updated_at DESC",
                (user['id'],)
            )
            notes = cursor.fetchall()
            cursor.close()
        finally:
            conn.close()
        for n in notes:
            if n.get('created_at'):
                n['created_at'] = n['created_at'].isoformat()
            if n.get('updated_at'):
                n['updated_at'] = n['updated_at'].isoformat()
        return jsonify(notes)
    except Exception as e:
        logger.error(f"Fehler notes GET: {e}")
        return jsonify({"message": "Fehler beim Laden"}), 500


@notes_blueprint.route('/api/notes', methods=['POST'])
def create_note():
    user = verify_token()
    if not user:
        return jsonify({"message": "Nicht autorisiert"}), 401
    try:
        data = request.get_json(silent=True) or {}
        title = data.get("title", "Neue Notiz").strip() or "Neue Notiz"
        content = data.get("content", "")
        language = data.get("language", "text")

        conn = get_connection()
        try:
            cursor = conn.cursor()
            cursor.execute(
                "INSERT INTO notes (user_id, title, content, language) VALUES (%s, %s, %s, %s)",
                (user['id'], title, content, language)
            )
            conn.commit()
            note_id = cursor.lastrowid
            cursor.close()
        finally:
            conn.close()

        logger.info(f"Notiz erstellt von {user['username']}: id={note_id}")
        return jsonify({"id": note_id, "title": title, "content": content, "language": language})
    except Exception as e:
        logger.error(f"Fehler notes POST: {e}")
        return jsonify({"message": "Fehler beim Erstellen"}), 500


@notes_blueprint.route('/api/notes/<int:note_id>', methods=['PUT'])
def update_note(note_id):
    user = verify_token()
    if not user:
        return jsonify({"message": "Nicht autorisiert"}), 401
    try:
        data = request.get_json(silent=True) or {}
        title = data.get("title", "").strip() or "Neue Notiz"
        content = data.get("content", "")
        language = data.get("language", "text")
        # mysql-connector expects a naive datetime for DATETIME columns;
        # strip tzinfo after converting to UTC to avoid driver warnings.
        now = datetime.now(timezone.utc).replace(tzinfo=None)

        conn = get_connection()
        try:
            cursor = conn.cursor()
            cursor.execute(
                "UPDATE notes SET title=%s, content=%s, language=%s, updated_at=%s "
                "WHERE id=%s AND user_id=%s",
                (title, content, language, now, note_id, user['id'])
            )
            conn.commit()
            affected = cursor.rowcount
            cursor.close()
        finally:
            conn.close()

        if affected == 0:
            return jsonify({"message": "Notiz nicht gefunden"}), 404
        return jsonify({"ok": True})
    except Exception as e:
        logger.error(f"Fehler notes PUT: {e}")
        return jsonify({"message": "Fehler beim Speichern"}), 500


@notes_blueprint.route('/api/notes/<int:note_id>', methods=['DELETE'])
def delete_note(note_id):
    user = verify_token()
    if not user:
        return jsonify({"message": "Nicht autorisiert"}), 401
    try:
        conn = get_connection()
        try:
            cursor = conn.cursor()
            cursor.execute(
                "DELETE FROM notes WHERE id=%s AND user_id=%s",
                (note_id, user['id'])
            )
            conn.commit()
            affected = cursor.rowcount
            cursor.close()
        finally:
            conn.close()

        if affected == 0:
            return jsonify({"message": "Notiz nicht gefunden"}), 404
        return jsonify({"ok": True})
    except Exception as e:
        logger.error(f"Fehler notes DELETE: {e}")
        return jsonify({"message": "Fehler beim Löschen"}), 500