import {CommandTemplate} from '../../models/commandTemplate'
import {CommandLoader} from '../commandLoader'

export class ConfigFileCommandTemplateLoader implements CommandLoader{
    
    private commandsConfiguration;

    constructor(commands:object){
        if(commands === undefined) throw new Error("commands arguments cannot be undefined");
        this.commandsConfiguration = commands;
    }

    loadCommandTemplateBy(filename: string): Promise<CommandTemplate> {
        const result = this.commandsConfiguration
                                .commands
                                .find(comm => comm.filename === filename);

        if(!result){
            throw new Error(`command with filename ${filename} was not found.`);
        }
        const response = new Promise<CommandTemplate>(resolve => {
            resolve(new CommandTemplate(result.filename, result.template));
        });
        return response;
    }
}