import * as process from 'process';
import { create } from './SdtfSdk';

const general = {
    help: ['-h', '--help'],
};
const command_jsonContent = {
    name: 'json-content',
    options: {
        url: ['-u', '--url'],
        file: ['-f', '--file'],
    },
};

(async () => {
    try {
        const sdk = await create();

        if (process.argv.length < 3 || (process.argv.length === 3 && isHelpArg(process.argv[2]))) {
            printGeneralInfo();
        } else if (process.argv[2] === command_jsonContent.name) {
            if (command_jsonContent.options.url.includes(process.argv[3])) {
                // Fetch and parse via url
                const asset = await sdk.createParser().readFromUrl(process.argv[4]);
                console.log(
                    'sdTF JSON content:\n',
                    sdk.createFormatter().prettifyReadableAsset(asset)
                );
            } else if (command_jsonContent.options.file.includes(process.argv[3])) {
                // Fetch and parse via file path
                const asset = await sdk.createParser().readFromFile(process.argv[4]);
                console.log(
                    'sdTF JSON content:\n',
                    sdk.createFormatter().prettifyReadableAsset(asset)
                );
            } else if (process.argv[3] === undefined || general.help.includes(process.argv[3])) {
                // help or undefined
                printJsonContentCommandInfo();
            } else {
                errExit(`Invalid option '${process.argv[3]}'.`);
            }
        } else {
            errExit(`Invalid command '${process.argv[2]}.'`);
        }
    } catch (e) {
        errExit(e);
    }
})();

function isHelpArg(arg: any): boolean {
    return general.help.includes(arg);
}

function errExit(e: Error | string): void {
    if (e instanceof Error) {
        console.error('ERROR:', e.message, '\n');
        console.error(e.stack);
    } else {
        console.error('ERROR:', e);
    }

    process.exit(1);
}

function printGeneralInfo(): void {
    console.log('Usage: sdtf <command>', '\n');
    console.log(
        'This is a commandline loader for sdTF (Structured Data Transfer Format) files.',
        '\n'
    );
    console.log('Commands:');
    console.log('\t', command_jsonContent.name, '-', 'Print JSON content of the specified sdTF.');
}

function printJsonContentCommandInfo(): void {
    console.log('Usage: sdtf <command>', 'command_jsonContent.name', '\n');
    console.log('Fetch or read the specified sdTF file and print its JSON content.', '\n');
    console.log('Options:');
    console.log('\t', general.help.join(', '), '\t', 'Show help.');
    console.log('\t', command_jsonContent.options.url.join(', '), '\t', 'Fetch sdTF from URL.', [
        'string',
    ]);
    console.log('\t', command_jsonContent.options.file.join(', '), '\t', 'Read sdTF from file.', [
        'string',
    ]);
}