/*
 * 	BSD 3-Clause License
 *
 * Copyright (c) 2019, NTT Ltd.
 * 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 the copyright holder 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 moment from "moment";
import brembo from "brembo";

export default class Report {

    constructor(channels, params, env) {

        this.config = env.config;
        this.logger = env.logger;
        this.pubSub = env.pubSub;
        this.params = params;

        for (let channel of channels){
            env.pubSub.subscribe(channel, (message, content) => {
                return this.report(message, content);
            });
        }
    }

    getBGPlayLink = (prefix, start, end, instant = null, rrcs = [0,1,2,5,6,7,10,11,13,14,15,16,18,20]) => {
        const bgplayTimeOffset = 5 * 60; // 5 minutes
        return brembo.build("https://stat.ripe.net/", {
            path: ["widget", "bgplay"],
            params: {
                "w.resource": prefix,
                "w.ignoreReannouncements": true,
                "w.starttime": moment(start).utc().unix() - bgplayTimeOffset,
                "w.endtime": moment(end).utc().unix(),
                "w.rrcs": rrcs.join(","),
                "w.instant": null,
                "w.type": "bgp",

            }
        }).replace("?", "#");
    };

    getContext = (channel, content) => {
        let context = {
            summary: content.message,
            earliest: moment(content.earliest).utc().format("YYYY-MM-DD hh:mm:ss"),
            latest: moment(content.latest).utc().format("YYYY-MM-DD hh:mm:ss"),
            channel,
            type: content.origin,
        };

        let matched = null;
        let pathsCount = {};
        let sortedPathIndex;

        if (this.params.showPaths > 0) {
            content.data
                .filter(i => !!i.matchedMessage && !!i.matchedMessage.path)
                .map(i => JSON.stringify(i.matchedMessage.path.getValues().slice(1)))
                .forEach(path => {
                    if (!pathsCount[path]) {
                        pathsCount[path] = 0;
                    }
                    pathsCount[path]++;
                });

            sortedPathIndex = Object.keys(pathsCount)
                .map(key => [key, pathsCount[key]]);

            sortedPathIndex.sort((first, second) => second[1] - first[1]);
            context.pathNumber = Math.min(this.params.showPaths, sortedPathIndex.length);
            context.paths = sortedPathIndex
                .slice(0, this.params.showPaths)
                .map(i => i[0]).join("\n");
        } else {
            context.pathNumber = "";
            context.paths = "Disabled";
        }

        switch(channel){
            case "hijack":
                matched = content.data[0].matchedRule;
                context.prefix = matched.prefix;
                context.description = matched.description;
                context.asn = matched.asn.toString();
                context.peers = [...new Set(content.data.map(alert => alert.matchedMessage.peer))].length;
                context.neworigin = content.data[0].matchedMessage.originAS;
                context.newprefix = content.data[0].matchedMessage.prefix;
                context.bgplay = this.getBGPlayLink(matched.prefix, content.earliest, content.latest);

                break;

            case "visibility":
                matched = content.data[0].matchedRule;
                context.prefix = matched.prefix;
                context.description = matched.description;
                context.asn = matched.asn.toString();
                context.peers = [...new Set(content.data.map(alert => alert.matchedMessage.peer))].length;
                context.bgplay = this.getBGPlayLink(matched.prefix, content.earliest, content.latest);
                break;

            case "newprefix":
                matched = content.data[0].matchedRule;
                context.prefix = matched.prefix;
                context.description = matched.description;
                context.asn = matched.asn.toString();
                context.peers = [...new Set(content.data.map(alert => alert.matchedMessage.peer))].length;
                context.neworigin = content.data[0].matchedMessage.originAS;
                context.newprefix = content.data[0].matchedMessage.prefix;
                context.bgplay = this.getBGPlayLink(matched.prefix, content.earliest, content.latest);
                break;

            case "software-update":
                break;

            case "path":
                break;

            case "misconfiguration":
                context.asn = content.data[0].matchedRule.asn.toString();
                break;

            case "rpki":
                matched = content.data[0].matchedRule;
                context.asn = matched.asn.toString();
                context.prefix = matched.prefix;
                context.description = matched.description;
                break;

            default:
                matched = content.data[0].matchedRule;
                context.prefix = matched.prefix;
                context.description = matched.description;
                context.asn = matched.asn.toString();
        }

        return context;
    };

    parseTemplate = (template, context) => {
        return template.replace(/\${([^}]*)}/g, (r,k)=>context[k]);
    };


    report = (message, content) => {
        throw new Error('The method report must be implemented');
    }
}