# Source: offline/utils/OfflineIndexDBManifestParser.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) 2013, 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.
     */

    /**
     * @ignore
     */
    const Entities = require('html-entities').XmlEntities;
    const OFFLINE_BASE_URL = 'offline_indexeddb://';

    function OfflineIndexDBManifestParser(config) {

        const manifestId = config.manifestId;
        const allMediaInfos = config.allMediaInfos;
        const urlUtils = config.urlUtils;
        const debug = config.debug;
        const dashConstants = config.dashConstants;
        const constants = config.constants;

        let instance,
            DOM,
            logger;

        function setup() {
            logger = debug.getLogger(instance);
        }

        /**
         * Parse XML manifest
         * @param {string} XMLDoc - xml manifest
         * @param {object} representation
         * @returns {Promise} a promise that will be resolved or rejected at the end of encoding process
         * @instance
        */
        function parse(XMLDoc, representation) {
            return new Promise(function (resolve, reject) {

                DOM = new DOMParser().parseFromString(XMLDoc, 'application/xml');
                let mpd = DOM.getElementsByTagName(dashConstants.MPD) ? DOM.getElementsByTagName(dashConstants.MPD) : null;

                for (let i = 0; i < mpd.length; i++) {
                    if (mpd[i] !== null) {
                        editBaseURLAttribute(mpd[i]);
                        browsePeriods(mpd[i], representation);
                    }
                }

                let manifestEncoded = encodeManifest(DOM);
                if (manifestEncoded !== '') {
                    resolve(manifestEncoded);
                } else {
                    reject('Encoded error');
                }
            });
        }

        /**
         * URL encode parsed manifest
         * @param {string} DOM
         * @returns {string} Url encoded XML
         * @instance
        */
        function encodeManifest(DOM) {
            logger.info('encodedManifest ' + new XMLSerializer().serializeToString(DOM));
            return new Entities().encode(new XMLSerializer().serializeToString(DOM));
        }

        /**
         * Update baseURL to point to local stored data P
         * @param {XML} currentMPD
         * @instance
        */
        function editBaseURLAttribute(currentMPD) {
            let basesURL,
                fragmentId,
                representationId;

            let url = `${OFFLINE_BASE_URL}${manifestId}/`;

            basesURL = currentMPD.getElementsByTagName(dashConstants.BASE_URL);

            if (basesURL.length === 0) {
                // add baseURL
                let element = DOM.createElement(dashConstants.BASE_URL);
                element.innerHTML = url;
                currentMPD.appendChild(element);
            }
            basesURL = currentMPD.getElementsByTagName(dashConstants.BASE_URL);
            for (let i = 0; i < basesURL.length; i++) {
                let parent = basesURL[i].parentNode;

                if (parent.nodeName === dashConstants.MPD) {
                    basesURL[i].innerHTML = url;
                } else if (parent.nodeName === dashConstants.REPRESENTATION) {
                    let adaptationsSet = parent.parentNode;
                    if (adaptationsSet.nodeName == dashConstants.ADAPTATION_SET) {

                        if (urlUtils.isHTTPS(basesURL[i].innerHTML) || urlUtils.isHTTPURL(basesURL[i].innerHTML)) {
                            fragmentId = getFragmentId(basesURL[i].innerHTML);
                            representationId = getBestRepresentationId(adaptationsSet);
                            basesURL[i].innerHTML = url + representationId + '_' + fragmentId;
                        } else if (basesURL[i].innerHTML === './') {
                            basesURL[i].innerHTML = url;
                        } else {
                            fragmentId = getFragmentId(basesURL[i].innerHTML);
                            representationId = getBestRepresentationId(adaptationsSet);
                            basesURL[i].innerHTML = representationId + '_' + fragmentId;
                        }
                    }
                } else {
                    basesURL[i].innerHTML = url;
                }
            }
        }

        /**
         * Browse periods
         * @param {XML} currentMPD
         * @param {Object} representation
         * @instance
        */
        function browsePeriods(currentMPD, representation) {
            let periods = currentMPD.getElementsByTagName(dashConstants.PERIOD);
            for (let j = 0; j < periods.length; j++) {
                browseAdaptationsSet(periods[j], representation);
            }
        }

        /**
         * Browse adapatation set to update data (delete those taht are not choosen by user ...)
         * @param {XML} currentPeriod
         * @param {Array} representationsToUpdate
         * @instance
        */
        function browseAdaptationsSet(currentPeriod, representationsToUpdate) {
            let adaptationsSet,
                currentAdaptationSet,
                currentAdaptationType,
                representations;

            adaptationsSet = currentPeriod.getElementsByTagName(dashConstants.ADAPTATION_SET);

            for (let i = adaptationsSet.length - 1; i >= 0; i--) {
                currentAdaptationSet = adaptationsSet[i];
                if (currentAdaptationSet) {
                    currentAdaptationType = findAdaptationType(currentAdaptationSet);
                    representations = findRepresentations(currentAdaptationSet);

                    findAndKeepOnlySelectedRepresentations(currentAdaptationSet, representations, currentAdaptationType);

                    representations = findRepresentations(currentAdaptationSet);

                    deleteSegmentBase(currentAdaptationSet);

                    if (representations.length === 0) {
                        currentPeriod.removeChild(currentAdaptationSet);
                    } else {
                        //detect Segment list use case
                        for (let i = 0; i < representations.length; i++) {
                            let rep = representations[i];
                            let segmentList = getSegmentList(rep);
                            if (segmentList.length >= 1) {
                                editSegmentListAttributes(segmentList, rep);
                            }
                        }

                        let segmentTemplate = getSegmentTemplate(currentAdaptationSet);
                        // segmentTemplate is defined, update attributes in order to be correctly played offline
                        if (segmentTemplate.length >= 1) {
                            editSegmentTemplateAttributes(segmentTemplate);
                        }

                        // detect SegmentBase use case => transfrom manifest to SegmentList in SegmentTemplate
                        if (representationsToUpdate && representationsToUpdate.length > 0 ) {
                            let selectedRep;
                            for (let i = 0; i < representations.length; i++) {
                                let rep = representations[i];
                                for (let j = 0; representationsToUpdate && j < representationsToUpdate.length; j++) {
                                    if (representationsToUpdate[j].id === rep.id) {
                                        selectedRep = representationsToUpdate[j];
                                        break;
                                    }
                                }
                            }
                            addSegmentTemplateAttributes(currentAdaptationSet, selectedRep);
                        }
                    }
                }
            }
        }

        /**
         * Returns type of adapation set
         * @param {XML} currentAdaptationSet
         * @returns {string|null} type
         * @instance
        */
        function findAdaptationType(currentAdaptationSet) {
            if (getIsMuxed(currentAdaptationSet)) {
                return constants.MUXED;
            } else if (getIsAudio(currentAdaptationSet)) {
                return constants.AUDIO;
            } else if (getIsVideo(currentAdaptationSet)) {
                return constants.VIDEO;
            } else if (getIsText(currentAdaptationSet)) {
                return constants.TEXT;
            } else if (getIsImage(currentAdaptationSet)) {
                return constants.IMAGE;
            }

            return null;
        }

        function getIsAudio(adaptation) {
            return getIsTypeOf(adaptation, constants.AUDIO);
        }

        function getIsVideo(adaptation) {
            return getIsTypeOf(adaptation, constants.VIDEO);
        }

        function getIsText(adaptation) {
            return getIsTypeOf(adaptation, constants.TEXT);
        }

        function getIsMuxed(adaptation) {
            return getIsTypeOf(adaptation, constants.MUXED);
        }

        function getIsImage(adaptation) {
            return getIsTypeOf(adaptation, constants.IMAGE);
        }

        // based upon DashManifestModel, but using DomParser
        function getIsTypeOf(adaptation, type) {

            if (!adaptation) {
                throw new Error('adaptation is not defined');
            }

            if (!type) {
                throw new Error('type is not defined');
            }

            return testMimeType(adaptation, type);
        }

        function testMimeType(adaptation, type) {
            let mimeTypeRegEx = (type !== constants.TEXT) ? new RegExp(type) : new RegExp('(vtt|ttml)');

            let mimeType = findMimeType(adaptation);
            if (mimeType) {
                return mimeTypeRegEx.test(mimeType);
            }

            // no mime type in adaptation, search in representation
            let representations = findRepresentations(adaptation);
            if (representations) {
                for (let i = 0; i < representations.length; i++) {
                    let representation = representations[i];
                    mimeType = findMimeType(representation);
                    if (mimeType) {
                        return mimeTypeRegEx.test(mimeType);
                    }
                }
            }
            return false;
        }

        /**
         * Returns mime-type of xml tag
         * @param {Object} tag
         * @returns {string|null} mimeType
         * @instance
        */
        function findMimeType(tag) {
            return tag.getAttribute(dashConstants.MIME_TYPE);
        }

        /**
         * Returns representations of adaptation set
         * @param {XML} adaptation
         * @returns {XML} representations
         * @instance
        */
        function findRepresentations(adaptation) {
            return adaptation.getElementsByTagName(dashConstants.REPRESENTATION);
        }

        /**
         * Return segment template list of adaptations set
         * @param {XML} currentAdaptationSet
         * @returns {XML} representations
         * @instance
        */
        function getSegmentTemplate(currentAdaptationSet) {
            return currentAdaptationSet.getElementsByTagName(dashConstants.SEGMENT_TEMPLATE);
        }

        /**
         * Return segment list tags of adaptations set
         * @param {XML} tag
         * @returns {XML} representations
         * @instance
        */
        function getSegmentList(tag) {
            return tag.getElementsByTagName(dashConstants.SEGMENT_LIST);
        }

        function deleteSegmentBase(tag) {
            let elements = tag.getElementsByTagName(dashConstants.SEGMENT_BASE);
            for (let i = 0; i < elements.length; i++) {
                let segmentBase = elements[i];
                segmentBase.parentNode.removeChild(segmentBase);
            }
        }

        /**
         * @param {XML} segmentTemplate
         * @param {object} rep
         * @instance
        */
        function addSegmentTimelineElements(segmentTemplate, rep) {
            let S = DOM.createElement('S');
            if (rep && rep.segments) {
                let segmentTimelineElement = DOM.createElement(dashConstants.SEGMENT_TIMELINE);
                let changedDuration = getDurationChangeArray(rep);
                for (let i = 0; i < changedDuration.length; i++) {
                    let repeatValue = i + 1 < changedDuration.length ? (changedDuration[i + 1] - changedDuration[i]) - 1 : 0;
                    if (repeatValue > 1) {
                        S.setAttribute('r', repeatValue);
                    }
                    S.setAttribute('d', rep.segments[changedDuration[i]].duration);
                    segmentTimelineElement.appendChild(S);
                    S = DOM.createElement('S');
                }
                segmentTemplate.appendChild(segmentTimelineElement);
            }
        }

        function getDurationChangeArray(rep) {
            let array = [];
            array.push(0);
            for (let i = 1; i < rep.segments.length; i++) {
                if (rep.segments[i - 1].duration !== rep.segments[i].duration) {
                    array.push(i);
                }
            }
            return array;
        }

        /**
         * Update attributes of segment templates to match offline urls
         * @param {Array} segmentsTemplates
         * @instance
        */
        function editSegmentTemplateAttributes(segmentsTemplates) {
            for (let i = 0; i < segmentsTemplates.length; i++) {
                let media = segmentsTemplates[i].getAttribute(dashConstants.MEDIA);
                media = '$RepresentationID$_$Number$' + media.substring(media.indexOf('.'), media.length); //id + extension
                segmentsTemplates[i].setAttribute(dashConstants.START_NUMBER, '0');
                segmentsTemplates[i].setAttribute(dashConstants.MEDIA, media);
                segmentsTemplates[i].setAttribute(dashConstants.INITIALIZATION_MINUS,'$RepresentationID$_init');
            }
        }

        /**
         * Update attributes of segment list to match offline urls
         * @param {Array} segmentLists
         * @param {Object} representation
         * @instance
        */
        function editSegmentListAttributes(segmentLists, representation) {
            let repId = representation.getAttribute(dashConstants.ID);
            for (let i = 0; i < segmentLists.length; i++) {

                let segmentList = segmentLists[i];
                let initialisation = segmentList.getElementsByTagName(dashConstants.INITIALIZATION);
                if (initialisation) {
                    let sourceURL = initialisation[0].getAttribute(dashConstants.SOURCE_URL);
                    sourceURL = `${repId}_init`;
                    initialisation[0].setAttribute(dashConstants.SOURCE_URL, sourceURL);
                }
                let segmentURLs = segmentList.getElementsByTagName(dashConstants.SEGMENT_URL);

                if (segmentURLs) {
                    for (let j = 0; j < segmentURLs.length; j++) {
                        let segmentUrl = segmentURLs[j];
                        let media = segmentUrl.getAttribute(dashConstants.MEDIA);
                        media = `${repId}_${j}`;
                        segmentUrl.setAttribute(dashConstants.MEDIA, media);
                    }
                }
            }
        }

        /**
         * @param {XML} adaptationSet
         * @param {object} rep
         * @instance
        */
        function addSegmentTemplateAttributes(adaptationSet, rep) {
            let segmentTemplateElement = DOM.createElement(dashConstants.SEGMENT_TEMPLATE);
            segmentTemplateElement.setAttribute(dashConstants.START_NUMBER, '0');
            segmentTemplateElement.setAttribute(dashConstants.MEDIA, '$RepresentationID$-$Time$');
            segmentTemplateElement.setAttribute(dashConstants.INITIALIZATION_MINUS,'$RepresentationID$_init');
            addSegmentTimelineElements(segmentTemplateElement, rep);
            adaptationSet.appendChild(segmentTemplateElement);
        }

        /**
         * Delete all representations except the one choosed by user
         * @param {XML} currentAdaptationSet
         * @param {XML} representations
         * @param {string} adaptationType
         * @instance
        */
        function findAndKeepOnlySelectedRepresentations(currentAdaptationSet, representations, adaptationType) {
            for ( var i = representations.length - 1; i >= 0; i--) {
                let representation = representations[i];
                let repId = representation.getAttribute(dashConstants.ID);
                if (allMediaInfos[adaptationType] && allMediaInfos[adaptationType].indexOf(repId) === -1) {
                    // representation is not selected, remove it
                    currentAdaptationSet.removeChild(representation);
                }
            }
        }

        //  UTILS
        /**
         * Get id of first representation of adaptation set
         * @param {XMl} currentAdaptationSet
         * @returns {string} id
         * @instance
        */
        function getBestRepresentationId(currentAdaptationSet) {
            let bestRepresentation = currentAdaptationSet.getElementsByTagName(dashConstants.REPRESENTATION)[0];
            console.log(bestRepresentation.getAttribute(dashConstants.ID));
            return bestRepresentation.getAttribute(dashConstants.ID);
        }

        /**
         * Parse and returns fragments of offline url => xxxx://xxxx/fragmentId/
         * @param {string} url
         * @returns {string} fragmentId
         * @instance
        */
        function getFragmentId(url) {
            let idxFragId = url.lastIndexOf('/');
            //logger.warn('fragId : ' + url.substring(idxFragId + 1, url.length));
            return url.substring(idxFragId,url.length);
        }

        setup();

        instance = {
            parse: parse
        };

        return instance;
    }
    OfflineIndexDBManifestParser.__dashjs_factory_name = 'OfflineIndexDBManifestParser';
    export default dashjs.FactoryMaker.getClassFactory(OfflineIndexDBManifestParser); /* jshint ignore:line */

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