#!/usr/bin/env node
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
const pkg = require('../package.json');
const semver = require('semver');
let requiredVersion = pkg.engines.node;
if (!semver.satisfies(process.version, requiredVersion)) {
    console.log(`Required node version ${requiredVersion} not satisfied with current version ${process.version}.`);
    process.exit(1);
}

global.fetch = require('node-fetch'); // Browser compatibility
const assert = require('assert');
const fs = require('fs-extra');
const path = require('path');
const readline = require('readline');
const readlineSync = require('readline-sync');
const minimist = require('minimist');
const chalk = require('chalk');
const help = require('../lib/help');
const qnamaker = require('../lib');
const manifest = require('../lib/api/qnamaker');
const { getServiceManifest } = require('../lib/utils/argsUtil');
const request = require('request-promise-native');
const Knowledgebase = require('../lib/api/knowledgebase');
const Endpointkeys = require('../lib/api/endpointkeys');
const Operations = require('../lib/api/operations');
const Delay = require('await-delay');

let args;

/**
 * Entry for the app
 *
 * @returns {Promise<void>}
 */
async function runProgram() {
    let argvFragment = process.argv.slice(2);
    if (argvFragment.length === 0) {
        argvFragment = ['-h'];
    }
    args = minimist(argvFragment);

    if (args.init) {
        const result = await initializeConfig();
        if (result) {
            process.stdout.write(`Successfully wrote ${process.cwd()}/.qnamakerrc`);
        }
        return;
    }

    if (args['!'] ||
        args.help ||
        args.h ||
        args._.includes('help')) {
        return help(args, process.stdout);
    }

    if (args.version || args.v) {
        return process.stdout.write(require(path.join(__dirname, '../package.json')).version);
    }

    const config = await composeConfig(args);
    if (!args.kbId)
        args.kbId = config.kbId;
    if (!args.hostname)
        args.hostname = config.hostname;

    if (args._[0] == "set")
        return await handleSetCommand(args, config);

    const serviceManifest = getServiceManifest(args);

    requestBody = await validateArguments(serviceManifest);

    // special case operations
    switch (serviceManifest.operation.methodAlias) {
        case "delete":
            if (!args.f && !args.force) {
                let kbResult = await new Knowledgebase().getKnowledgebaseDetails(config);
                let kb = JSON.parse(await kbResult.text());
                let answer = readlineSync.question(`Are you sure you would like to delete ${kb.name} [${kb.id}]? [no] `, { defaultInput: 'no' });
                if (answer.trim()[0] == 'n') {
                    process.stderr.write('operation canceled');
                    return;
                }
            }
            break;
    }

    let result = await qnamaker(config, serviceManifest, args, requestBody);
    if (result.error) {
        throw new Error(JSON.stringify(result.error, null, 4));
    }

    // special case response
    switch (serviceManifest.operation.name) {
        case "getKnowledgebaseDetails": {
            config.kbId = result.id;
            let kb = await updateKbId(config);
            if (args.msbot) {
                process.stdout.write(JSON.stringify({
                    type: "qna",
                    name: kb.name,
                    id: kb.id,
                    kbId: kb.id,
                    subscriptionKey: config.subscriptionKey,
                    endpointKey: config.endpointKey,
                    hostname: kb.hostName
                }, null, 2));
            } else {
                process.stdout.write(JSON.stringify(result, null, 2));
            }
        }
            break;

        case "createKnowledgebase": {
            result = await waitForOperationSucceeded(config, result);
            let kbId = result.resourceLocation.split('/')[2];
            config.kbId = kbId;
            let kb = await updateKbId(config);
            if (args.msbot) {
                process.stdout.write(JSON.stringify({
                    type: "qna",
                    name: kb.name,
                    id: kb.id,
                    kbId: kb.id,
                    subscriptionKey: config.subscriptionKey,
                    endpointKey: config.endpointKey,
                    hostname: config.hostname
                }, null, 2));

            } else {
                process.stdout.write(JSON.stringify(result, null, 2));
            }
            if (!(args.q || args.quiet) && !args.msbot) {
                let answer = readlineSync.question(`\nWould you like to save ${kb.name} ${kb.id} in your .qnamakerrc so that future commands will be with this KB? [yes]`, { defaultInput: 'yes' });
                if (answer[0] == 'y') {
                    await fs.writeJson(path.join(process.cwd(), '.qnamakerrc'), config, { spaces: 2 });
                    process.stdout.write('.qnamakerrc updated');
                }
            }
            break;
        }
        case "downloadLegacyKnowledgebase":
            if (!result.name) {
                result.name = "unknown";
                if (args.name) {
                    result.name = args.name;
                }
                else {
                    if (!(args.q || args.quiet)) {
                        let answer = readlineSync.question(`\nWhat is the name of your knowledgebase? `);
                        if (answer && answer.length > 0)
                            result.name = answer;
                    }
                }
            }
            process.stdout.write(JSON.stringify(result, null, 2));
            break;

        default: {
            // dump json as json stringified
            if (typeof result == 'string')
                process.stdout.write(result);
            else
                process.stdout.write(JSON.stringify(result, null, 2));
            break;
        }
    }
}

/**
 * Walks the user though the creation of the .qnamakerrc
 * file and writes it to disk. The knowledge base ID and subscription key
 * are optional but if omitted, --\knowledgeBaseID and --subscriptionKey
 * flags may be required for some commands.
 *
 * @returns {Promise<*>}
 */
async function initializeConfig() {
    process.stdout.write(chalk.cyan.bold('\nThis util will walk you through creating a .qnamakerrc file\n\nPress ^C at any time to quit.\n\n'));
    const questions = [
        'What is your QnAMaker access/subscription key? (found on the Cognitive Services Azure portal page under "access keys") ',
        'What would you like to use as your active knowledgebase ID? [none] '
    ];

    const prompt = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
    });

    const answers = [];
    for (let i = 0; i < questions.length; i++) {
        const question = questions[i];
        const answer = await new Promise((resolve) => {

            function doPrompt(promptMessage) {
                prompt.question(promptMessage, response => {
                    resolve(response);
                });
            }

            doPrompt(question);
        });
        answers.push(answer.trim());
    }

    let [subscriptionKey, kbId] = answers;

    const config = Object.assign({}, { subscriptionKey, kbId });

    if (subscriptionKey && kbId) {
        await updateKbId(config);
    }

    try {
        await new Promise((resolve, reject) => {
            const confirmation = `\n\nDoes this look ok?\n${JSON.stringify(config, null, 2)}\n[Yes]/No: `;
            prompt.question(confirmation, response => {
                /^(y|yes)$/.test((response || 'yes').toLowerCase()) ? resolve(response) : reject();
            });
        });
    } catch (e) {
        return false;
    }
    await fs.writeJson(path.join(process.cwd(), '.qnamakerrc'), config, { spaces: 2 });
    return true;
}

async function updateKbId(config) {
    let response = await new Endpointkeys().getEndpointKeys(config);
    config.endpointKey = JSON.parse(await response.text()).primaryEndpointKey;

    response = await new Knowledgebase().getKnowledgebaseDetails(config);
    let kb = JSON.parse(await response.text());
    config.hostname = kb.hostName;

    return kb;
}

/**
 * Retrieves the input file to send as
 * the body of the request.
 *
 * @param args
 * @returns {Promise<*>}
 */
async function getFileInput(args) {
    if (typeof args.in !== 'string') {
        return null;
    }
    // Let any errors fall through to the runProgram() promise
    return await fs.readJson(path.resolve(args.in));
}

/**
 * Composes the config from the 3 sources that it may reside.
 * Precedence is 1. Arguments, 2. qnamakerrc and 3. env variables
 *
 * @returns {Promise<*>}
 */
async function composeConfig() {
    const { QNA_MAKER_SUBSCRIPTION_KEY, QNAMAKER_HOSTNAME, QNAMAKER_ENDPOINTKEY, QNA_MAKER_KBID } = process.env;
    const { subscriptionKey, hostname, endpointKey, kbId } = args;

    let qnamakerrcJson = {};
    let config;
    try {
        await fs.access(path.join(process.cwd(), '.qnamakerrc'), fs.R_OK);
        qnamakerrcJson = await fs.readJson(path.join(process.cwd(), '.qnamakerrc'));
    } catch (e) {
        // Do nothing
    } finally {
        config = {
            subscriptionKey: (subscriptionKey || qnamakerrcJson.subscriptionKey || QNA_MAKER_SUBSCRIPTION_KEY),
            hostname: (hostname || qnamakerrcJson.hostname || QNAMAKER_HOSTNAME),
            endpointKey: (endpointKey || qnamakerrcJson.endpointKey || QNAMAKER_ENDPOINTKEY),
            kbId: (kbId || qnamakerrcJson.kbId || QNA_MAKER_KBID)
        };
        validateConfig(config);
    }
    return config;
}

/**
 * Validates the config object to contain the
 * fields necessary for endpoint calls.
 *
 * @param {*} config The config object to validate
 */
function validateConfig(config) {
    // appId and versionId are not validated here since
    // not all operations require these to be present.
    // Validation of specific params are done in the
    // ServiceBase.js
    const { subscriptionKey, knowledgeBaseID, endpoint, endpointKey } = config;
    const messageTail = `is missing from the configuration.\n\nDid you run ${chalk.cyan.bold('qnamaker --init')} yet?`;
    assert(typeof subscriptionKey === 'string', `The subscriptionKey ${messageTail}`);
}

/**
 * Provides basic validation of the command arguments.
 *
 * @param serviceManifest
 */
async function validateArguments(serviceManifest) {
    let error = new Error();
    let body = undefined;
    error.name = 'ArgumentError';
    if (!serviceManifest) {
        error.message = 'The operation does not exist';
        throw error;
    }

    const { operation } = serviceManifest;
    if (!operation) {
        error.message = 'The operation does not exist';

        throw error;
    }

    const entitySpecified = typeof args.in === 'string';
    const entityRequired = !!operation.entityName;

    if (!entityRequired && entitySpecified) {
        error.message = `The ${operation.name} operation does not accept an input`;

        throw error;
    }

    if (entityRequired) {
        if (entitySpecified) {
            body = await getFileInput(args);
        }
        else {
            switch (serviceManifest.operation.name) {
                case "generateAnswer":
                    body = {
                        question: args.question,
                        top: args.top
                    };
                    break;
                default:
                    error.message = `The ${operation.name} requires an input of type: ${operation.entityType}`;
                    throw error;
            }
        }
    }

    if (serviceManifest.operation.params) {
        for (let param of serviceManifest.operation.params) {
            if (param.required) {
                if (!args[param.name] && !args[param.alias || param.name]) {
                    error.message = `The --${param.name} argument is missing and required`;
                    throw error;
                }
            }
        }
    }

    // Note that the ServiceBase will validate params that may be required.
    return body;
}


/**
 * Exits with a non-zero status and prints
 * the error if present or displays the help
 *
 * @param error
 */
async function handleError(error) {
    process.stderr.write('\n' + chalk.red.bold(error + '\n\n'));
    //    if (error.name === 'ArgumentError') {
    await help(args);
    //    }
    return 1;
}

async function handleSetCommand(args, config) {
    let target = args._.length >= 2 ? args._[1].toLowerCase() : undefined;
    if (!target) {
        process.stdout.write(chalk.red.bold(`missing .qnamakerrc property name: [kbid|subscriptionkey]\n`));
        return help(args);
    }

    let targetName = (args._.length >= 3) ? args._.slice(2).join(' ').toLowerCase().trim() : undefined;
    if (!targetName) {
        process.stdout.write(chalk.red.bold(`missing the value\n`));
        return help(args);
    }

    switch (target) {
        case 'endpointkey':
            config.endpointKey = targetName;
            break;

        case 'hostname':
            config.hostname = targetName;
            break;

        case 'subscriptionkey':
            config.subscriptionKey = targetName;
            break;

        case 'kbid':
            config.kbId = targetName;
            await updateKbId(config);
            break;

        default:
            process.stdout.write(chalk.red.bold(`unknown .qnamakerrc property ${target}. Valid values are: [kbid|subscriptionkey]\n`));
            return help(args);
    }
    await fs.writeJson(path.join(process.cwd(), '.qnamakerrc'), config, { spaces: 2 });
    process.stdout.write(JSON.stringify(config, null, 4));
    return true;
}

async function waitForOperationSucceeded(config, result) {
    while (result.operationState != "Succeeded") {
        let opResult = await new Operations().getOperationDetails({ subscriptionKey: config.subscriptionKey, operationId: result.operationId });
        result = JSON.parse(await opResult.text());

        if (result.operationState == "Succeeded")
            break;
        await Delay(1000);
    }
    return result;
}

runProgram()
    .then(process.exit)
    .catch(handleError)
    .then(process.exit);