// -*- 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 * as fs from 'fs';
import JSONStream from 'JSONStream';
import * as Tp from 'thingpedia';
import seedrandom from 'seedrandom';

import { DialogueGenerator } from '../lib/sentence-generator/batch';
import * as StreamUtils from '../lib/utils/stream-utils';
import { DialogueSerializer } from '../lib/dataset-tools/parsers';

import { ActionSetFlag } from './lib/argutils';

const DIALOG_SERIALIZERS : Record<string, () => NodeJS.ReadWriteStream> = {
    json() {
        return JSONStream.stringify();
    },

    txt() {
        return new DialogueSerializer();
    },

    txt_only() {
        return new DialogueSerializer({ annotations: false });
    }
};

export function initArgparse(subparsers : argparse.SubParser) {
    const parser = subparsers.add_parser('generate-dialogs', {
        add_help: true,
        description: "Generate a new synthetic dialog 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('--timezone', {
        required: false,
        default: undefined,
        help: `Timezone to use to print dates and times (defaults to the current timezone).`
    });
    parser.add_argument('-f', '--output-format', {
        required: false,
        default: 'txt-only',
        choices: ['json', 'txt', 'txt-only'],
        help: `Output format`
    });
    parser.add_argument('--max-turns', {
        required: false,
        default: 6,
        type: Number,
        help: `Maximum number of turns per dialog`
    });
    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('--policy', {
        required: false,
        help: 'Path to JS/TS module defining the dialogue policy.'
    });
    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: 250,
        help: 'Pruning target for each non-terminal',
    });
    parser.add_argument('-B', '--minibatch-size', {
        required: false,
        type: Number,
        default: 1000,
        help: 'Number of partial dialogue to keep in the working set for each minibatch',
    });
    parser.add_argument('-n', '--num-minibatches', {
        required: false,
        default: 1,
        type: Number,
        help: `Number of minibatches of dialogues to generate`
    });

    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('--log-prefix', {
        required: false,
        default: '',
        help: 'Additional prefix to debugging messages'
    });
    parser.add_argument('--random-seed', {
        default: 'almond is awesome',
        help: 'Random seed'
    });
}

export async function execute(args : any) {
    const tpClient = new Tp.FileClient(args);
    const options = {
        rng: seedrandom.alea(args.random_seed),
        locale: args.locale,
        timezone: args.timezone,
        flags: args.flags || {},
        policy: args.policy,
        targetLanguage: args.target_language,
        thingpediaClient: tpClient,
        maxDepth: args.maxdepth,
        targetPruningSize: args.target_pruning_size,
        maxTurns: args.max_turns,
        minibatchSize: args.minibatch_size,
        numMinibatches: args.num_minibatches,
        logPrefix: args.log_prefix,

        debug: args.debug,
    };
    new DialogueGenerator(options)
        .pipe(DIALOG_SERIALIZERS[args.output_format.replace('-', '_')]())
        .pipe(args.output);

    await StreamUtils.waitFinish(args.output);
}