from flask import Blueprint, request, jsonify

import api
from api import require_auth, etag_response
from db import get_db
from db.models.Markdown import Markdown
from db.models.Path import Path
from api import limiter
import logging
logger = logging.getLogger(__name__)

path_bp = Blueprint('path', __name__, url_prefix='/api/path')

@path_bp.route('/', methods=['GET'])
@limiter.limit(api.get_rate_limit)
@etag_response
def get_root_paths():
    with get_db() as session:
        paths = session.query(Path).filter(Path.parent_id == 1)
        return jsonify([pth.to_dict() for pth in paths]), 200

@path_bp.route('/<int:path_id>', methods=['GET'])
@limiter.limit(api.get_rate_limit)
@etag_response
def get_path(path_id):
    with get_db() as session:
        path = session.query(Path).get(path_id)
        if path is None:
            return jsonify({"error": "file not found"}), 404
        return jsonify(path.to_dict()), 200

@path_bp.route('/parent/<int:parent_id>', methods=['GET'])
@limiter.limit(api.get_rate_limit)
@etag_response
def get_path_by_parent(parent_id):
    with get_db() as session:
        paths = session.query(Path).filter(Path.parent_id == parent_id).all()
        return jsonify([pth.to_dict() for pth in paths]), 200

@path_bp.route('/', methods=['POST'])
@limiter.limit(api.get_rate_limit)
@require_auth(roles=['admin', 'creator'])
def create_path():
    data = request.json
    if not data or 'name' not in data or 'parent_id' not in data:
        return jsonify({"error": "bad request"}), 400
    with get_db() as session:
        if data['parent_id'] != 1 and not session.query(Path).get(data['parent_id']):
            return jsonify({"error": "path not found"}), 404
        if session.query(Path).filter_by(name=data['name'], parent_id=data['parent_id']).first():
            return jsonify({"error": "Path already exists under the parent"}), 409
        new_path = Path(name=data['name'], parent_id=data['parent_id'])
        session.add(new_path)
        session.commit()
        return jsonify(new_path.to_dict()), 201

@path_bp.route('/<int:path_id>', methods=['PUT'])
@limiter.limit(api.get_rate_limit)
@require_auth(roles=['admin'])
def update_path(path_id):
    data = request.json
    if not data or 'name' not in data or 'parent_id' not in data:
        return jsonify({"error": "bad request"}), 400
    with get_db() as session:
        path = session.query(Path).get(path_id)
        if path is None:
            return jsonify({"error": "path not found"}), 404
        if session.query(Path).filter_by(name=data['name'], parent_id=data['parent_id']).first():
            return jsonify({"error": "Path already exists under the parent"}), 409
        path.name = data['name']
        path.parent_id = data['parent_id']
        session.commit()
        return jsonify(path.to_dict()), 200

@path_bp.route('/<int:path_id>', methods=['PATCH'])
@limiter.limit(api.get_rate_limit)
@require_auth(roles=['admin'])
def patch_path(path_id):
    data = request.json
    if not data or 'name' not in data and 'parent_id' not in data:
        return jsonify({"error": "bad request"}), 400
    with get_db() as session:
        path = session.query(Path).get(path_id)
        if path is None:
            return jsonify({"error": "path not found"}), 404
        updated_name =data.get('name', path.name)
        updated_parent_id = data.get('parent_id', path.parent_id)

        if session.query(Path).filter_by(name=updated_name, parent_id=updated_parent_id).first():
            return jsonify({"error": "Path already exists under the parent"}), 409
        path.name = updated_name
        path.parent_id = updated_parent_id
        session.commit()
        return jsonify(path.to_dict()), 200


@path_bp.route('/<int:path_id>', methods=['DELETE'])
@limiter.limit(api.get_rate_limit)
@require_auth(roles=['admin'])
def delete_path(path_id):
    with get_db() as session:
        path = session.query(Path).get(path_id)
        if not path:
            return jsonify({"error": "path not found"}), 404
        if session.query(Path).filter_by(parent_id=path_id).first():
            return jsonify({"error": "can not delete non empty path"}), 409
        if session.query(Markdown).filter_by(path_id=path_id).first():
            return jsonify({"error": "can not delete non empty path"}), 409
        session.delete(path)
        session.commit()
        return jsonify({"message": "path deleted"}), 200


@path_bp.route('/move_forward/<int:path_id>', methods=['PATCH'])
@require_auth(roles=['admin'])
@limiter.limit(api.get_rate_limit)
def move_forward(path_id):
    with get_db() as session:
        path = session.query(Path).get(path_id)
        if not path:
            return jsonify({"error": "file not found"}), 404
        siblings = session.query(Path).filter(Path.parent_id == path.parent_id).order_by(Path.order).all()
        current_index = siblings.index(path)
        if current_index == 0:
            return jsonify({"error": "already at the first position"}), 400
        previous_path = siblings[current_index - 1]
        path.order, previous_path.order = previous_path.order, path.order
        session.commit()
        return jsonify(path.to_dict()), 200


@path_bp.route('/move_backward/<int:path_id>', methods=['PATCH'])
@require_auth(roles=['admin'])
@limiter.limit(api.get_rate_limit)
def move_backward(path_id):
    with get_db() as session:
        path = session.query(Path).get(path_id)
        if not path:
            return jsonify({"error": "file not found"}), 404
        siblings = session.query(Path).filter(Path.parent_id == path.parent_id).order_by(Path.order).all()
        current_index = siblings.index(path)
        if current_index == len(siblings) - 1:
            return jsonify({"error": "already at the last position"}), 400

        next_path = siblings[current_index + 1]
        path.order, next_path.order = next_path.order, path.order
        session.commit()
        return jsonify(path.to_dict()), 200