from datetime import datetime
from flask import (jsonify, request, abort, Blueprint, current_app)
from sqlalchemy.exc import DataError
from sqlalchemy.orm.exc import NoResultFound
from app import encryption

from app.dao.users_dao import (
    get_model_users,
    save_model_user,
    create_user_code,
    get_user_code,
    use_user_code,
    increment_failed_login_count,
    reset_failed_login_count
)
from app.schemas import (
    user_schema,
    users_schema,
    request_verify_code_schema,
    user_schema_load_json
)
from app.celery.tasks import (send_sms_code, send_email_code)
from app.errors import register_errors

user = Blueprint('user', __name__)
register_errors(user)


@user.route('', methods=['POST'])
def create_user():
    user, errors = user_schema.load(request.get_json())
    req_json = request.get_json()
    # TODO password policy, what is valid password
    if not req_json.get('password', None):
        errors.update({'password': ['Missing data for required field.']})
        return jsonify(result="error", message=errors), 400
    if errors:
        return jsonify(result="error", message=errors), 400
    save_model_user(user, pwd=req_json.get('password'))
    return jsonify(data=user_schema.dump(user).data), 201


@user.route('/<int:user_id>', methods=['PUT'])
def update_user(user_id):
    user = get_model_users(user_id=user_id)
    if not user:
        return jsonify(result="error", message="User not found"), 404
    req_json = request.get_json()
    update_dct, errors = user_schema_load_json.load(req_json)
    pwd = req_json.get('password', None)
    # TODO password validation, it is already done on the admin app
    # but would be good to have the same validation here.
    if pwd is not None and not pwd:
        errors.update({'password': ['Invalid data for field']})
    if errors:
        return jsonify(result="error", message=errors), 400
    status_code = 200
    save_model_user(user, update_dict=update_dct, pwd=pwd)
    return jsonify(data=user_schema.dump(user).data), status_code


@user.route('/<int:user_id>/verify/password', methods=['POST'])
def verify_user_password(user_id):
    try:
        user = get_model_users(user_id=user_id)
    except DataError:
        return jsonify(result="error", message="Invalid user id"), 400
    except NoResultFound:
        return jsonify(result="error", message="User not found"), 404
    txt_pwd = None
    try:
        txt_pwd = request.get_json()['password']
    except KeyError:
        return jsonify(
            result="error",
            message={'password': ['Required field missing data']}), 400
    if user.check_password(txt_pwd):
        reset_failed_login_count(user)
        return jsonify({}), 204
    else:
        increment_failed_login_count(user)
        return jsonify(result='error', message={'password': ['Incorrect password']}), 400


@user.route('/<int:user_id>/verify/code', methods=['POST'])
def verify_user_code(user_id):
    try:
        user = get_model_users(user_id=user_id)
    except DataError:
        return jsonify(result="error", message="Invalid user id"), 400
    except NoResultFound:
        return jsonify(result="error", message="User not found"), 404
    txt_code = None
    resp_json = request.get_json()
    txt_type = None
    errors = {}
    try:
        txt_code = resp_json['code']
    except KeyError:
        errors.update({'code': ['Required field missing data']})
    try:
        txt_type = resp_json['code_type']
    except KeyError:
        errors.update({'code_type': ['Required field missing data']})
    if errors:
        return jsonify(result="error", message=errors), 400
    code = get_user_code(user, txt_code, txt_type)
    if not code:
        return jsonify(result="error", message="Code not found"), 404
    if datetime.now() > code.expiry_datetime or code.code_used:
        return jsonify(result="error", message="Code has expired"), 400
    use_user_code(code.id)
    return jsonify({}), 204


@user.route('/<int:user_id>/code', methods=['POST'])
def send_user_code(user_id):
    try:
        user = get_model_users(user_id=user_id)
    except DataError:
        return jsonify(result="error", message="Invalid user id"), 400
    except NoResultFound:
        return jsonify(result="error", message="User not found"), 404

    verify_code, errors = request_verify_code_schema.load(request.get_json())
    if errors:
        return jsonify(result="error", message=errors), 400

    from app.dao.users_dao import create_secret_code
    secret_code = create_secret_code()
    create_user_code(user, secret_code, verify_code.get('code_type'))
    if verify_code.get('code_type') == 'sms':
        mobile = user.mobile_number if verify_code.get('to', None) is None else verify_code.get('to')
        verification_message = {'to': mobile, 'secret_code': secret_code}
        send_sms_code.apply_async([encryption.encrypt(verification_message)], queue='sms-code')
    elif verify_code.get('code_type') == 'email':
        email = user.email_address if verify_code.get('to', None) is None else verify_code.get('to')
        verification_message = {
            'to_address': email,
            'from_address': current_app.config['VERIFY_CODE_FROM_EMAIL_ADDRESS'],
            'subject': 'Verification code',
            'body': secret_code}
        send_email_code.apply_async([encryption.encrypt(verification_message)], queue='email-code')
    else:
        abort(500)
    return jsonify({}), 204


@user.route('/<int:user_id>', methods=['GET'])
@user.route('', methods=['GET'])
def get_user(user_id=None):
    users = get_model_users(user_id=user_id)
    if not users:
        return jsonify(result="error", message="not found"), 404
    result = users_schema.dump(users) if isinstance(users, list) else user_schema.dump(users)
    return jsonify(data=result.data)