/*
 * 	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 yargs from 'yargs';

const params = yargs
    .usage('Usage: $0 <command> [options]')

    .command('$0', 'Run BGPalerter (default)', function () {
    })
    .example('$0 run -c config.yml', 'Run BGPalerter')
    .command('generate', 'Generate prefixes to monitor', function () {
        yargs.alias('o', 'output')
            .nargs('o', 1)
            .describe('o', 'Write to file')

            .alias('a', 'asn')
            .nargs('a', 1)
            .describe('a', 'AS number to monitor')

            .alias('e', 'exclude')
            .nargs('e', 1)
            .describe('e', 'Prefixes to exclude')

            .alias('p', 'prefixes')
            .nargs('p', 1)
            .describe('p', 'Prefixes to include')

            .alias('l', 'prefixes-file')
            .nargs('l', 1)
            .describe('l', 'File containing the prefixes to include')

            .alias('i', 'ignore-delegated')
            .nargs('i', 0)
            .describe('i', 'Ignore delegated prefixes')

            .alias('s', 'monitor-as')
            .nargs('s', 1)
            .describe('s', 'List of monitored ASes to be added for generic monitoring in options.monitorASns.')

            .alias('m', 'monitor-as-origin')
            .nargs('m', 0)
            .describe('m', 'Automatically generate list of monitored ASes (options.monitorASns) from prefix origins.')

            .demandOption(['o']);
    })
    .example('$0 generate -a 2914 -o prefixes.yml', 'Generate prefixes for AS2914')
    .help('h')
    .alias('h', 'help')
    .epilog('Copyright (c) 2019, NTT Ltd')
    .argv;

switch(params._[0]) {
    case "generate":
        const generatePrefixes = require("./src/generatePrefixesList");
        let prefixes = null;
        let monitoredASes = false;
        if (params.pf) {
            throw new Error("The argument --pf has been deprecated. Use -l instead");
        }
        if (params.p && params.l) {
            throw new Error("The argument -p is not compatible with the argument -l");
        } else if (params.p) {
            prefixes = params.p.split(",");
        } else if (params.l) {
            const fs = require("fs");
            if (fs.existsSync(params.l)) {
                prefixes = fs.readFileSync(params.l, 'utf8').split(/\r?\n/).filter(i => i && true);
            } else {
                throw new Error("The prefix list file (-l) is not readable");
            }
        }

        if (params.s && params.m) {
            throw new Error("You can specify -s or -m, not both");
        } else if (params.s) {
            monitoredASes = (params.s) ? params.s.toString().split(",") : null;
        } else if (params.m) {
            monitoredASes = true;
        }

        generatePrefixes(
            (params.a) ? params.a.toString().split(",") : null,
            params.o,
            (params.e || "").split(","),
            params.i || false,
            prefixes,
            monitoredASes
        );

        break;

    default: // Run monitor
        const Worker = require("./src/worker").default;
        module.exports = new Worker(params.c);
}