import {injectable, inject} from 'inversify';
import {ModuleManagement} from '../interfaces/ModuleManagement';
import {CommandUtil, Spawn} from 'firmament-yargs';
import path = require('path');
import fs = require('fs');
import * as _ from 'lodash';

@injectable()
export class ModuleManagementImpl implements ModuleManagement {
  constructor(@inject('CommandUtil') private commandUtil: CommandUtil,
              @inject('Spawn') private spawn: Spawn) {
  }

  get modulePrefix(): string {
    return 'firmament-';
  }

  installModule(argv: any) {
    const me = this;
    if(!argv.name) {
      me.commandUtil.processExit(1, `\nPlease provide a module name using the '--name <module_name>' switch\n`);
    }
    if(!_.startsWith(argv.name, me.modulePrefix)) {
      argv.name = `${me.modulePrefix}${argv.name}`;
      //me.commandUtil.processExit(1, `\nModule names must start with '${me.modulePrefix}'\n`);
    }
    const prefix = path.resolve(__dirname, '../..');
    const cmd = ['npm', 'install', '--save', '--prefix', `${prefix}`, argv.name];
    me.spawn.spawnShellCommandAsync(cmd, null,
      () => {
      },
      (err: Error) => {
        if(err) {
          //Assume the error was permission related and retry under 'sudo'
          me.spawn.sudoSpawnAsync(cmd, null,
            () => {
            },
            (err: Error) => {
              if(err) {
                me.commandUtil.processExitWithError(err);
              } else {
                me.commandUtil.processExit(0, `Looks like module '${argv.name}' installed successfully!`);
              }
            }
          );
        } else {
          me.commandUtil.processExit(0, `Looks like module '${argv.name}' installed successfully!`);
        }
      }
    );
  }
}