from flask import Blueprint, current_app, jsonify, request
from notifications_utils import SMS_CHAR_COUNT_LIMIT

from app import api_user, authenticated_service
from app.config import QueueNames
from app.dao import notifications_dao
from app.errors import InvalidRequest, register_errors
from app.models import (
    EMAIL_TYPE,
    KEY_TYPE_TEAM,
    LETTER_TYPE,
    PRIORITY,
    SMS_TYPE,
)
from app.notifications.process_notifications import (
    persist_notification,
    send_notification_to_queue,
    simulated_recipient,
)
from app.notifications.validators import (
    check_if_service_can_send_to_number,
    check_rate_limiting,
    service_has_permission,
    validate_template,
)
from app.schemas import (
    email_notification_schema,
    notification_with_personalisation_schema,
    notifications_filter_schema,
    sms_template_notification_schema,
)
from app.service.utils import service_allowed_to_send_to
from app.utils import get_public_notify_type_text, pagination_links

notifications = Blueprint('notifications', __name__)

register_errors(notifications)


@notifications.route('/notifications/<uuid:notification_id>', methods=['GET'])
def get_notification_by_id(notification_id):
    notification = notifications_dao.get_notification_with_personalisation(
        str(authenticated_service.id),
        notification_id,
        key_type=None)
    return jsonify(data={"notification": notification_with_personalisation_schema.dump(notification)}), 200


@notifications.route('/notifications', methods=['GET'])
def get_all_notifications():
    data = notifications_filter_schema.load(request.args)

    include_jobs = data.get('include_jobs', False)
    page = data.get('page', 1)
    page_size = data.get('page_size', current_app.config.get('API_PAGE_SIZE'))
    limit_days = data.get('limit_days')

    pagination = notifications_dao.get_notifications_for_service(
        str(authenticated_service.id),
        personalisation=True,
        filter_dict=data,
        page=page,
        page_size=page_size,
        limit_days=limit_days,
        key_type=api_user.key_type,
        include_jobs=include_jobs)
    return jsonify(
        notifications=notification_with_personalisation_schema.dump(pagination.items, many=True),
        page_size=page_size,
        total=pagination.total,
        links=pagination_links(
            pagination,
            '.get_all_notifications',
            **request.args.to_dict()
        )
    ), 200


@notifications.route('/notifications/<string:notification_type>', methods=['POST'])
def send_notification(notification_type):

    if notification_type not in [SMS_TYPE, EMAIL_TYPE]:
        msg = "{} notification type is not supported".format(notification_type)
        msg = msg + ", please use the latest version of the client" if notification_type == LETTER_TYPE else msg
        raise InvalidRequest(msg, 400)

    notification_form = (
        sms_template_notification_schema if notification_type == SMS_TYPE else email_notification_schema
    ).load(request.get_json())

    check_rate_limiting(authenticated_service, api_user)

    template, template_with_content = validate_template(
        template_id=notification_form['template'],
        personalisation=notification_form.get('personalisation', {}),
        service=authenticated_service,
        notification_type=notification_type
    )

    _service_allowed_to_send_to(notification_form, authenticated_service)
    if not service_has_permission(notification_type, authenticated_service.permissions):
        raise InvalidRequest(
            {'service': ["Cannot send {}".format(get_public_notify_type_text(notification_type, plural=True))]},
            status_code=400
        )

    if notification_type == SMS_TYPE:
        check_if_service_can_send_to_number(authenticated_service, notification_form['to'])

    # Do not persist or send notification to the queue if it is a simulated recipient
    simulated = simulated_recipient(notification_form['to'], notification_type)
    notification_model = persist_notification(template_id=template.id,
                                              template_version=template.version,
                                              postage=template.postage,
                                              recipient=request.get_json()['to'],
                                              service=authenticated_service,
                                              personalisation=notification_form.get('personalisation', None),
                                              notification_type=notification_type,
                                              api_key_id=api_user.id,
                                              key_type=api_user.key_type,
                                              simulated=simulated,
                                              reply_to_text=template.reply_to_text,
                                              )
    if not simulated:
        queue_name = QueueNames.PRIORITY if template.process_type == PRIORITY else None
        send_notification_to_queue(notification=notification_model,
                                   research_mode=authenticated_service.research_mode,
                                   queue=queue_name)
    else:
        current_app.logger.debug("POST simulated notification for id: {}".format(notification_model.id))
    notification_form.update({"template_version": template.version})

    return jsonify(
        data=get_notification_return_data(
            notification_model.id,
            notification_form,
            template_with_content)
    ), 201


def get_notification_return_data(notification_id, notification, template):
    output = {
        'template_version': notification['template_version'],
        'notification': {'id': notification_id},
        'body': template.content_with_placeholders_filled_in,
    }

    if hasattr(template, 'subject'):
        output['subject'] = template.subject

    return output


def _service_allowed_to_send_to(notification, service):
    if not service_allowed_to_send_to(notification['to'], service, api_user.key_type):
        if api_user.key_type == KEY_TYPE_TEAM:
            message = 'Can’t send to this recipient using a team-only API key'
        else:
            message = (
                'Can’t send to this recipient when service is in trial mode '
                '– see https://www.notifications.service.gov.uk/trial-mode'
            )
        raise InvalidRequest(
            {'to': [message]},
            status_code=400
        )


def create_template_object_for_notification(template, personalisation):
    template_object = template._as_utils_template_with_personalisation(personalisation)

    if template_object.missing_data:
        message = 'Missing personalisation: {}'.format(", ".join(template_object.missing_data))
        errors = {'template': [message]}
        raise InvalidRequest(errors, status_code=400)

    if (
        template_object.template_type == SMS_TYPE and
        template_object.is_message_too_long()
    ):
        message = 'Content has a character count greater than the limit of {}'.format(SMS_CHAR_COUNT_LIMIT)
        errors = {'content': [message]}
        raise InvalidRequest(errors, status_code=400)
    return template_object