/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

/*
 * Copyright 2015 Joyent, Inc.
 *
 * The `triton` CLI class.
 */

var assert = require('assert-plus');
var bunyan = require('bunyan');
var child_process = require('child_process'),
    spawn = child_process.spawn,
    exec = child_process.exec;
var cmdln = require('cmdln'),
    Cmdln = cmdln.Cmdln;
var fs = require('fs');
var mkdirp = require('mkdirp');
var util = require('util'),
    format = util.format;
var path = require('path');
var vasync = require('vasync');

var common = require('./common');
var mod_config = require('./config');
var errors = require('./errors');
var tritonapi = require('./tritonapi');



//---- globals

var pkg = require('../package.json');

var CONFIG_DIR = path.resolve(process.env.HOME, '.triton');

var OPTIONS = [
    {
        names: ['help', 'h'],
        type: 'bool',
        help: 'Print this help and exit.'
    },
    {
        name: 'version',
        type: 'bool',
        help: 'Print version and exit.'
    },
    {
        names: ['verbose', 'v'],
        type: 'bool',
        help: 'Verbose/debug output.'
    },

    {
        names: ['profile', 'p'],
        type: 'string',
        env: 'TRITON_PROFILE',
        helpArg: 'NAME',
        help: 'Triton client profile to use.'
    },

    {
        group: 'CloudAPI Options'
    },

    /*
     * Environment variable integration.
     *
     * While dashdash supports integrated envvar parsing with options
     * we don't use that with `triton` because (a) we want to apply *option*
     * usage (but not envvars) to profiles other than the default 'env'
     * profile, and (b) we want to support `TRITON_*` *and* `SDC_*` envvars,
     * which dashdash doesn't support.
     *
     * See <https://github.com/joyent/node-triton/issues/28> for some details.
     */
    {
        names: ['account', 'a'],
        type: 'string',
        help: 'Account (login name). Environment: TRITON_ACCOUNT=ACCOUNT ' +
            'or SDC_ACCOUNT=ACCOUNT.',
        helpArg: 'ACCOUNT'
    },
    {
        names: ['act-as'],
        type: 'string',
        help: 'Masquerade as the given account login name. This can only ' +
            'succeed for operator accounts. Note that accesses like these ' +
            'audited on the CloudAPI server side.',
        helpArg: 'ACCOUNT',
        hidden: true
    },
    {
        names: ['user', 'u'],
        type: 'string',
        help: 'RBAC user (login name). Environment: TRITON_USER=USER ' +
            'or SDC_USER=USER.',
        helpArg: 'USER'
    },
    // TODO: full rbac support
    //{
    //    names: ['role'],
    //    type: 'arrayOfString',
    //    env: 'MANTA_ROLE',
    //    help: 'Assume a role. Use multiple times or once with a list',
    //    helpArg: 'ROLE,ROLE,...'
    //},
    {
        names: ['keyId', 'k'],
        type: 'string',
        help: 'SSH key fingerprint. Environment: TRITON_KEY_ID=FINGERPRINT ' +
            'or SDC_KEY_ID=FINGERPRINT.',
        helpArg: 'FP'
    },
    {
        names: ['url', 'U'],
        type: 'string',
        help: 'CloudAPI URL. Environment: TRITON_URL=URL or SDC_URL=URL.',
        helpArg: 'URL'
    },
    {
        names: ['J'],
        type: 'string',
        hidden: true,
        help: 'Joyent Public Cloud (JPC) datacenter name. This is ' +
            'a shortcut to the "https://$dc.api.joyent.com" ' +
            'cloudapi URL.'
    },
    {
        names: ['insecure', 'i'],
        type: 'bool',
        help: 'Do not validate the CloudAPI SSL certificate. Environment: ' +
            'TRITON_TLS_INSECURE=1, SDC_TLS_INSECURE=1 (or the deprecated ' +
            'SDC_TESTING=1).',
        'default': false
    },
    {
        names: ['accept-version'],
        type: 'string',
        helpArg: 'VER',
        help: 'A cloudapi API version, or semver range, to attempt to use. ' +
            'This is passed in the "Accept-Version" header. ' +
            'See `triton cloudapi /--ping` to list supported versions. ' +
            'The default is "' + tritonapi.CLOUDAPI_ACCEPT_VERSION + '". ' +
            '*This is intended for development use only. It could cause ' +
            '`triton` processing of responses to break.*',
        hidden: true
    }
];



// ---- other support stuff

function parseCommaSepStringNoEmpties(option, optstr, arg) {
    // JSSTYLED
    return arg.trim().split(/\s*,\s*/g)
        .filter(function (part) { return part; });
}

cmdln.dashdash.addOptionType({
    name: 'commaSepString',
    takesArg: true,
    helpArg: 'STRING',
    parseArg: parseCommaSepStringNoEmpties
});

cmdln.dashdash.addOptionType({
    name: 'arrayOfCommaSepString',
    takesArg: true,
    helpArg: 'STRING',
    parseArg: parseCommaSepStringNoEmpties,
    array: true,
    arrayFlatten: true
});



//---- CLI class

function CLI() {
    Cmdln.call(this, {
        name: 'triton',
        desc: pkg.description,
        options: OPTIONS,
        helpOpts: {
            includeEnv: true,
            minHelpCol: 30
        },
        helpSubcmds: [
            'help',
            'profiles',
            'profile',
            { group: 'Other Commands' },
            'info',
            'account',
            'keys',
            'services',
            'datacenters',
            { group: 'Instances (aka VMs/Machines/Containers)' },
            'create-instance',
            'instances',
            'instance',
            'instance-audit',
            'start-instance',
            'stop-instance',
            'reboot-instance',
            'delete-instance',
            'wait-instance',
            'ssh',
            { group: 'Images' },
            'images',
            'image',
            { group: 'Packages' },
            'packages',
            'package',
            { group: 'Networks' },
            'networks',
            'network'
        ],
        helpBody: [
            /* BEGIN JSSTYLED */
            'Exit Status:',
            '    0   Successful completion.',
            '    1   An error occurred.',
            '    2   Usage error.',
            '    3   "ResourceNotFound" error. Returned when an instance, image,',
            '        package, etc. with the given name or id is not found.'
            /* END JSSTYLED */
        ].join('\n')
    });
}
util.inherits(CLI, Cmdln);

CLI.prototype.init = function (opts, args, callback) {
    var self = this;
    this.opts = opts;

    this.log = bunyan.createLogger({
        name: this.name,
        serializers: bunyan.stdSerializers,
        stream: process.stderr,
        level: 'warn'
    });
    if (opts.verbose) {
        this.log.level('trace');
        this.log.src = true;
        this.showErrStack = true;
    }

    if (opts.version) {
        console.log(this.name, pkg.version);
        callback(false);
        return;
    }

    if (opts.url && opts.J) {
        callback(new errors.UsageError(
            'cannot use both "--url" and "-J" options'));
    } else if (opts.J) {
        opts.url = format('https://%s.api.joyent.com', opts.J);
    }

    this.configDir = CONFIG_DIR;

    this.__defineGetter__('tritonapi', function () {
        if (self._tritonapi === undefined) {
            var config = mod_config.loadConfig({
                configDir: self.configDir
            });
            self.log.trace({config: config}, 'loaded config');

            var profileName = opts.profile || config.profile || 'env';
            var profile = mod_config.loadProfile({
                configDir: self.configDir,
                name: profileName
            });
            self._applyProfileOverrides(profile);
            self.log.trace({profile: profile}, 'loaded profile');

            self._tritonapi = tritonapi.createClient({
                log: self.log,
                profile: profile,
                config: config
            });
        }
        return self._tritonapi;
    });

    // Cmdln class handles `opts.help`.
    Cmdln.prototype.init.apply(this, arguments);
};


CLI.prototype.fini = function fini(subcmd, err, cb) {
    this.log.trace({err: err, subcmd: subcmd}, 'cli fini');
    if (this._tritonapi) {
        this._tritonapi.close();
        delete this._tritonapi;
    }
    cb(err, subcmd);
};


/*
 * Apply overrides from CLI options to the given profile object *in place*.
 */
CLI.prototype._applyProfileOverrides =
        function _applyProfileOverrides(profile) {
    var self = this;
    [
        {oname: 'account', pname: 'account'},
        {oname: 'user', pname: 'user'},
        {oname: 'url', pname: 'url'},
        {oname: 'keyId', pname: 'keyId'},
        {oname: 'insecure', pname: 'insecure'},
        {oname: 'accept_version', pname: 'acceptVersion'},
        {oname: 'act_as', pname: 'actAsAccount'}
    ].forEach(function (field) {
        // We need to check `opts._order` to know if boolean opts
        // were specified.
        var specified = self.opts._order.filter(
            function (opt) { return opt.key === field.oname; }).length > 0;
        if (specified) {
            profile[field.pname] = self.opts[field.oname];
        }
    });
};


// Meta
CLI.prototype.do_completion = require('./do_completion');
CLI.prototype.do_profiles = require('./do_profiles');
CLI.prototype.do_profile = require('./do_profile');
CLI.prototype.do_env = require('./do_env');

// Other
CLI.prototype.do_account = require('./do_account');
CLI.prototype.do_services = require('./do_services');
CLI.prototype.do_datacenters = require('./do_datacenters');
CLI.prototype.do_info = require('./do_info');
CLI.prototype.do_keys = require('./do_keys');

// Images
CLI.prototype.do_images = require('./do_images');
CLI.prototype.do_image = require('./do_image');

// Instances (aka VMs/containers/machines)
CLI.prototype.do_instance = require('./do_instance');
CLI.prototype.do_instances = require('./do_instances');
CLI.prototype.do_create_instance = require('./do_create_instance');
CLI.prototype.do_instance_audit = require('./do_instance_audit');
CLI.prototype.do_stop_instance = require('./do_startstop_instance')('stop');
CLI.prototype.do_start_instance = require('./do_startstop_instance')('start');
CLI.prototype.do_reboot_instance = require('./do_startstop_instance')('reboot');
CLI.prototype.do_delete_instance =
    require('./do_startstop_instance')({action: 'delete', aliases: ['rm']});
CLI.prototype.do_wait_instance = require('./do_wait_instance');
CLI.prototype.do_ssh = require('./do_ssh');

// Packages
CLI.prototype.do_packages = require('./do_packages');
CLI.prototype.do_package = require('./do_package');

// Networks
CLI.prototype.do_networks = require('./do_networks');
CLI.prototype.do_network = require('./do_network');

// Hidden commands
CLI.prototype.do_cloudapi = require('./do_cloudapi');
CLI.prototype.do_badger = require('./do_badger');
CLI.prototype.do_rbac = require('./do_rbac');



//---- mainline

function main(argv) {
    if (!argv) {
        argv = process.argv;
    }

    var cli = new CLI();
    cli.main(argv, function (err, subcmd) {
        var exitStatus = (err ? err.exitStatus || 1 : 0);
        var showErr = (cli.showErr !== undefined ? cli.showErr : true);

        if (err && showErr) {
            var code = (err.body ? err.body.code : err.code) || err.restCode;
            if (code === 'NoCommand') {
                /* jsl:pass */
            } else if (err.message !== undefined) {
                console.error('%s%s: error%s: %s',
                    cli.name,
                    (subcmd ? ' ' + subcmd : ''),
                    (code ? format(' (%s)', code) : ''),
                    (cli.showErrStack ? err.stack : err.message));

                // If this is a usage error, attempt to show some usage info.
                if (['Usage', 'Option'].indexOf(code) !== -1 && subcmd) {
                    var help = cli.helpFromSubcmd(subcmd);
                    if (help && typeof (help) === 'string') {
                        // Would like a shorter synopsis. Attempt to
                        // parse it down, somewhat generally. Unfortunately this
                        // doesn't work for multi-level subcmds, like
                        // `triton rbac subcmd ...`.
                        var usageIdx = help.indexOf('\nUsage:');
                        if (usageIdx !== -1) {
                            help = help.slice(usageIdx);
                        }
                        console.error(help);
                    }
                }
            }
        }

        /*
         * We'd like to NOT use `process.exit` because that doesn't always
         * allow std handles to flush (e.g. all logging to complete). However
         * I don't know of another way to exit non-zero.
         */
        if (exitStatus !== 0) {
            process.exit(exitStatus);
        }
    });
}

//---- exports

module.exports = {
    CONFIG_DIR: CONFIG_DIR,
    CLI: CLI,
    main: main
};