const chalk = require('chalk');

const wait = require('../../lib/utils/output/wait');
const listInput = require('../../lib/utils/input/list');
const cfg = require('../../lib/cfg');
const exit = require('../../lib/utils/exit');
const success = require('../../lib/utils/output/success');
const info = require('../../lib/utils/output/info');
const error = require('../../lib/utils/output/error');
const param = require('../../lib/utils/output/param');

async function updateCurrentTeam({ cfg, newTeam } = {}) {
  delete newTeam.created;
  delete newTeam.creator_id;
  await cfg.merge({ currentTeam: newTeam });
}

module.exports = async function(teams, args) {
  let stopSpinner = wait('Fetching teams');
  const list = (await teams.ls()).teams;
  let { user, currentTeam } = await cfg.read();
  const accountIsCurrent = !currentTeam;
  stopSpinner();

  if (accountIsCurrent) {
    currentTeam = {
      slug: user.username || user.email
    };
  }

  if (args.length !== 0) {
    const desiredSlug = args[0];

    const newTeam = list.find(team => team.slug === desiredSlug);
    if (newTeam) {
      await updateCurrentTeam({ cfg, newTeam });
      success(`The team ${chalk.bold(newTeam.name)} is now active!`);
      return exit();
    }
    if (desiredSlug === user.username) {
      stopSpinner = wait('Saving');
      await cfg.remove('currentTeam');
      stopSpinner();
      return success(`Your account (${chalk.bold(desiredSlug)}) is now active!`);
    }
    error(`Could not find membership for team ${param(desiredSlug)}`);
    return exit(1);
  }

  const choices = list.map(({ slug, name }) => {
    name = `${slug} (${name})`;
    if (slug === currentTeam.slug) {
      name += ` ${chalk.bold('(current)')}`;
    }

    return {
      name,
      value: slug,
      short: slug
    };
  });

  const suffix = accountIsCurrent ? ` ${chalk.bold('(current)')}` : '';

  const userEntryName = user.username ?
    `${user.username} (${user.email})${suffix}` :
    user.email

  choices.unshift({
    name: userEntryName,
    value: user.email,
    short: user.username
  });

  // Let's bring the current team to the beginning of the list
  if (!accountIsCurrent) {
    const index = choices.findIndex(
      choice => choice.value === currentTeam.slug
    );
    const choice = choices.splice(index, 1)[0];
    choices.unshift(choice);
  }

  let message;

  if (currentTeam) {
    message = `Switch to:`;
  }

  const choice = await listInput({
    message,
    choices,
    separator: false
  });

  // Abort
  if (!choice) {
    info('No changes made');
    return exit();
  }

  const newTeam = list.find(item => item.slug === choice);

  // Switch to account
  if (!newTeam) {
    if (currentTeam.slug === user.username || currentTeam.slug === user.email) {
      info('No changes made')
      return exit()
    }
    stopSpinner = wait('Saving');
    await cfg.remove('currentTeam');
    stopSpinner();
    return success(`Your account (${chalk.bold(choice)}) is now active!`);
  }

  if (newTeam.slug === currentTeam.slug) {
    info('No changes made')
    return exit();
  }

  stopSpinner = wait('Saving');
  await updateCurrentTeam({ cfg, newTeam });
  stopSpinner();

  success(`The team ${chalk.bold(newTeam.name)} is now active!`);
};