from datetime import datetime

from flask import (jsonify, request)
from sqlalchemy.exc import DataError
from sqlalchemy.orm.exc import NoResultFound
from app.dao import DAOException

from app.dao.users_dao import get_model_users
from app.dao.services_dao import (
    dao_fetch_service_by_id_and_user,
    dao_fetch_service_by_id,
    dao_fetch_all_services,
    dao_create_service,
    dao_update_service,
    dao_fetch_all_services_by_user
)
from app.dao.templates_dao import (
    save_model_template,
    get_model_templates,
    delete_model_template
)
from app.dao.api_key_dao import (
    save_model_api_key,
    get_model_api_keys,
    get_unsigned_secret
)
from app.models import ApiKey
from app.schemas import (
    services_schema,
    service_schema,
    templates_schema,
    api_keys_schema,
    template_schema_load_json,
    template_schema
)

from flask import Blueprint

service = Blueprint('service', __name__)

from app.errors import register_errors

register_errors(service)


@service.route('', methods=['GET'])
def get_services():
    user_id = request.args.get('user_id', None)
    if user_id:
        services = dao_fetch_all_services_by_user(user_id)
    else:
        services = dao_fetch_all_services()
    data, errors = services_schema.dump(services)
    return jsonify(data=data)


@service.route('/<service_id>', methods=['GET'])
def get_service_by_id(service_id):
    user_id = request.args.get('user_id', None)
    if user_id:
        fetched = dao_fetch_service_by_id_and_user(service_id, user_id)
    else:
        fetched = dao_fetch_service_by_id(service_id)
    if not fetched:
        return jsonify(result="error", message="not found"), 404
    data, errors = service_schema.dump(fetched)
    return jsonify(data=data)


@service.route('', methods=['POST'])
def create_service():
    data = request.get_json()

    if not data.get('user_id', None):
        return jsonify(result="error", message={'user_id': ['Missing data for required field.']}), 400

    user = get_model_users(data['user_id'])

    if not user:
        return jsonify(result="error", message={'user_id': ['not found']}), 400

    request.get_json().pop('user_id', None)

    valid_service, errors = service_schema.load(request.get_json())

    if errors:
        return jsonify(result="error", message=errors), 400

    dao_create_service(valid_service, user)
    return jsonify(data=service_schema.dump(valid_service).data), 201


@service.route('/<service_id>', methods=['POST'])
def update_service(service_id):
    fetched_service = dao_fetch_service_by_id(service_id)
    if not fetched_service:
        return jsonify(result="error", message="not found"), 404

    current_data = dict(service_schema.dump(fetched_service).data.items())
    current_data.update(request.get_json())

    update_dict, errors = service_schema.load(current_data)
    if errors:
        return jsonify(result="error", message=errors), 400
    dao_update_service(update_dict)
    return jsonify(data=service_schema.dump(fetched_service).data), 200


@service.route('/<service_id>/api-key', methods=['POST'])
def renew_api_key(service_id=None):
    fetched_service = dao_fetch_service_by_id(service_id=service_id)
    if not fetched_service:
        return jsonify(result="error", message="Service not found"), 404

    try:
        # create a new one
        # TODO: what validation should be done here?
        secret_name = request.get_json()['name']
        key = ApiKey(service=fetched_service, name=secret_name)
        save_model_api_key(key)
    except DAOException as e:
        return jsonify(result='error', message=str(e)), 500
    unsigned_api_key = get_unsigned_secret(key.id)
    return jsonify(data=unsigned_api_key), 201


@service.route('/<service_id>/api-key/revoke/<int:api_key_id>', methods=['POST'])
def revoke_api_key(service_id, api_key_id):
    try:
        service_api_key = get_model_api_keys(service_id=service_id, id=api_key_id)
    except DataError:
        return jsonify(result="error", message="Invalid  api key for service"), 400
    except NoResultFound:
        return jsonify(result="error", message="Api key not found for service"), 404

    save_model_api_key(service_api_key, update_dict={'id': service_api_key.id, 'expiry_date': datetime.utcnow()})
    return jsonify(), 202


@service.route('/<service_id>/api-keys', methods=['GET'])
@service.route('/<service_id>/api-keys/<int:key_id>', methods=['GET'])
def get_api_keys(service_id, key_id=None):
    try:
        service = dao_fetch_service_by_id(service_id=service_id)
    except DataError:
        return jsonify(result="error", message="Invalid service id"), 400
    except NoResultFound:
        return jsonify(result="error", message="Service not found"), 404

    try:
        if key_id:
            api_keys = [get_model_api_keys(service_id=service_id, id=key_id)]
        else:
            api_keys = get_model_api_keys(service_id=service_id)
    except DAOException as e:
        return jsonify(result='error', message=str(e)), 500
    except NoResultFound:
        return jsonify(result="error", message="API key not found"), 404

    return jsonify(apiKeys=api_keys_schema.dump(api_keys).data), 200


@service.route('/<service_id>/template', methods=['POST'])
def create_template(service_id):
    fetched_service = dao_fetch_service_by_id(service_id=service_id)
    if not fetched_service:
        return jsonify(result="error", message="Service not found"), 404
    template, errors = template_schema.load(request.get_json())
    if errors:
        return jsonify(result="error", message=errors), 400
    template.service = fetched_service
    # I believe service is already added to the session but just needs a
    # db.session.commit
    save_model_template(template)
    return jsonify(data=template_schema.dump(template).data), 201


@service.route('/<service_id>/template/<int:template_id>', methods=['PUT', 'DELETE'])
def update_template(service_id, template_id):
    fetched_service = dao_fetch_service_by_id(service_id=service_id)
    if not fetched_service:
        return jsonify(result="error", message="Service not found"), 404
    try:
        template = get_model_templates(template_id=template_id)
    except DataError:
        return jsonify(result="error", message="Invalid template id"), 400
    except NoResultFound:
        return jsonify(result="error", message="Template not found"), 404
    if request.method == 'DELETE':
        status_code = 202
        delete_model_template(template)
    else:
        status_code = 200
        update_dict, errors = template_schema_load_json.load(request.get_json())
        if errors:
            return jsonify(result="error", message=errors), 400
        try:
            save_model_template(template, update_dict=update_dict)
        except DAOException as e:
            return jsonify(result="error", message=str(e)), 500
    return jsonify(data=template_schema.dump(template).data), status_code


@service.route('/<service_id>/template/<int:template_id>', methods=['GET'])
@service.route('/<service_id>/template', methods=['GET'])
def get_service_template(service_id, template_id=None):
    try:
        templates = get_model_templates(service_id=service_id, template_id=template_id)
    except DataError:
        return jsonify(result="error", message="Invalid template id"), 400
    except NoResultFound:
        return jsonify(result="error", message="Template not found"), 404
    if isinstance(templates, list):
        data, errors = templates_schema.dump(templates)
    else:
        data, errors = template_schema.dump(templates)
    if errors:
        return jsonify(result="error", message=str(errors))
    return jsonify(data=data)