// -*- mode: typescript; indent-tabs-mode: nil; js-basic-offset: 4 -*-
//
// This file is part of Genie
//
// Copyright 2019-2020 The Board of Trustees of the Leland Stanford Junior University
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Author: Giovanni Campagna <gcampagn@cs.stanford.edu>

import * as argparse from 'argparse';
import seedrandom from 'seedrandom';
import * as fs from 'fs';
import * as Tp from 'thingpedia';

import { BasicSentenceGenerator } from '../lib/sentence-generator/batch';
import { DatasetStringifier } from '../lib/dataset-tools/parsers';
import ProgressBar from './lib/progress_bar';
import { ActionSetFlag } from './lib/argutils';

export function initArgparse(subparsers : argparse.SubParser) {
    const parser = subparsers.add_parser('generate', {
        add_help: true,
        description: "Generate a new synthetic dataset, given a template file."
    });
    parser.add_argument('-o', '--output', {
        required: true,
        type: fs.createWriteStream
    });
    parser.add_argument('-l', '--locale', {
        required: false,
        default: 'en-US',
        help: `BGP 47 locale tag of the language to generate (defaults to 'en-US', English)`
    });
    parser.add_argument('-t', '--target-language', {
        required: false,
        default: 'thingtalk',
        choices: ['thingtalk', 'dlgthingtalk'],
        help: `The programming language to generate`
    });
    parser.add_argument('--thingpedia', {
        required: true,
        help: 'Path to ThingTalk file containing class definitions.'
    });
    parser.add_argument('--entities', {
        required: false,
        help: 'Path to JSON file containing entity type definitions.'
    });
    parser.add_argument('--dataset', {
        required: true,
        help: 'Path to file containing primitive templates, in ThingTalk syntax.'
    });
    parser.add_argument('--template', {
        required: false,
        nargs: '+',
        default: ['single-command.genie'],
        help: 'Path to file(s) containing construct templates, in Genie syntax.'
    });
    parser.add_argument('--set-flag', {
        required: false,
        nargs: 1,
        action: ActionSetFlag,
        const: true,
        metavar: 'FLAG',
        help: 'Set a flag for the construct template file.',
    });
    parser.add_argument('--unset-flag', {
        required: false,
        nargs: 1,
        action: ActionSetFlag,
        const: false,
        metavar: 'FLAG',
        help: 'Unset (clear) a flag for the construct template file.',
    });
    parser.add_argument('--maxdepth', {
        required: false,
        type: Number,
        default: 8,
        help: 'Maximum depth of sentence generation',
    });
    parser.add_argument('--target-pruning-size', {
        required: false,
        type: Number,
        default: 500,
        help: 'Approximate target size of the generate dataset, for each $root rule and each depth',
    });

    parser.add_argument('--debug', {
        nargs: '?',
        const: 1,
        default: 0,
        help: 'Enable debugging. Can be specified with an argument between 0 and 5 to choose the verbosity level.',
    });
    parser.add_argument('--no-debug', {
        const: 0,
        action: 'store_const',
        dest: 'debug',
        help: 'Disable debugging.',
    });
    parser.add_argument('--no-progress', {
        action: 'store_false',
        dest: 'progress',
        default: true,
        help: 'Disable the progress bar (implied if --debug is passed).',
    });
    parser.add_argument('--random-seed', {
        default: 'almond is awesome',
        help: 'Random seed'
    });
    parser.add_argument('--white-list', {
        required: false,
        help: `List of functions to include, split by comma (no space).`
    });
    parser.add_argument('--id-prefix', {
        required: false,
        default: '',
        help: 'Prefix to add to all sentence IDs (useful to combine multiple datasets).'
    });
}

export async function execute(args : any) {
    const tpClient = new Tp.FileClient(args);
    const options = {
        rng: seedrandom.alea(args.random_seed),
        locale: args.locale,
        timezone: undefined,
        flags: args.flags || {},
        templateFiles: args.template,
        targetLanguage: args.target_language,
        thingpediaClient: tpClient,
        targetPruningSize: args.target_pruning_size,
        maxDepth: args.maxdepth,
        debug: args.debug,
        whiteList: args.white_list,
        idPrefix: args.id_prefix
    };

    const generator = new BasicSentenceGenerator(options);
    generator.pipe(new DatasetStringifier()).pipe(args.output);
    args.output.on('finish', () => process.exit());

    if (!args.debug && args.progress) {
        const progbar = new ProgressBar(1);
        generator.on('progress', (value) => {
            //console.log(value);
            progbar.update(value);
        });

        // issue an update now to show the progress bar
        progbar.update(0);
    }
}