# Source: streaming/utils/LocationSelector.js

    /**
     * The copyright in this software is being made available under the BSD License,
     * included below. This software may be subject to other third party and contributor
     * rights, including patent rights, and no such rights are granted under this license.
     *
     * Copyright (c) 2023, Dash Industry Forum.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without modification,
     * are permitted provided that the following conditions are met:
     *  * Redistributions of source code must retain the above copyright notice, this
     *  list of conditions and the following disclaimer.
     *  * Redistributions in binary form must reproduce the above copyright notice,
     *  this list of conditions and the following disclaimer in the documentation and/or
     *  other materials provided with the distribution.
     *  * Neither the name of Dash Industry Forum nor the names of its
     *  contributors may be used to endorse or promote products derived from this software
     *  without specific prior written permission.
     *
     *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
     *  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     *  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     *  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     *  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     *  POSSIBILITY OF SUCH DAMAGE.
     */

    import Events from '../../core/events/Events';
    import BlacklistController from '../controllers/BlacklistController';
    import FactoryMaker from '../../core/FactoryMaker';
    import Settings from '../../core/Settings';
    import ContentSteeringController from '../../dash/controllers/ContentSteeringController';

    function LocationSelector() {

        const context = this.context;
        const settings = Settings(context).getInstance();

        let instance,
            blacklistController,
            contentSteeringController;

        function setup() {
            blacklistController = BlacklistController(context).create({
                updateEventName: Events.SERVICE_LOCATION_LOCATION_BLACKLIST_CHANGED,
                addBlacklistEventName: Events.SERVICE_LOCATION_LOCATION_BLACKLIST_ADD
            });
            contentSteeringController = ContentSteeringController(context).getInstance();
        }

        function setConfig(config) {
            if (config.blacklistController) {
                blacklistController = config.blacklistController;
            }
            if (config.contentSteeringController) {
                contentSteeringController = config.contentSteeringController;
            }
        }

        /**
         *
         * @param {MpdLocation[]} mpdLocations
         * @returns {*}
         */
        function select(mpdLocations) {
            if (!mpdLocations || mpdLocations.length === 0) {
                return null;
            }

            let mpdLocation = null;
            if (settings.get().streaming.applyContentSteering) {
                mpdLocation = _selectByContentSteering(mpdLocations)
            }

            if (!mpdLocation) {
                mpdLocation = _selectByDefault(mpdLocations);
            }

            return mpdLocation;
        }

        function _selectByContentSteering(mpdLocations) {
            // Search in the response data of the steering server
            const currentSteeringResponseData = contentSteeringController.getCurrentSteeringResponseData();
            if (currentSteeringResponseData && currentSteeringResponseData.pathwayPriority && currentSteeringResponseData.pathwayPriority.length > 0) {
                return _findMpdLocation(currentSteeringResponseData.pathwayPriority, mpdLocations);
            }

            return null;
        }

        function _findMpdLocation(pathwayPriority = [], mpdLocations = []) {
            let i = 0;
            let target = null;
            while (i < pathwayPriority.length) {
                const curr = pathwayPriority[i];
                const idx = mpdLocations.findIndex((elem) => {
                    return elem.serviceLocation && elem.serviceLocation === curr;
                })
                if (idx !== -1 && !blacklistController.contains(mpdLocations[idx].serviceLocation)) {
                    target = mpdLocations[idx]
                    break;
                }
                i += 1;
            }
            return target;
        }

        function _selectByDefault(mpdLocations) {
            return mpdLocations[0];
        }

        function reset() {
            blacklistController.reset();
        }

        instance = {
            select,
            setConfig,
            reset
        };

        setup();

        return instance;
    }

    LocationSelector.__dashjs_factory_name = 'LocationSelector';
    export default FactoryMaker.getClassFactory(LocationSelector);

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