#!/usr/bin/env node

/**
 * Module dependencies.
 */

const program = require('./commander');

// Make things colorful!
require('colors');
const emoji = require('node-emoji');

const dir = process.cwd();
const fs = require('fs');
const path = require('path');
const spawn = require('cross-spawn');
const resolve = require('resolve');
const {plugins, isInternal} = require('../plugins');

function existsInNodeModules(name) {
  try {
    resolve.sync(name, {basedir: dir});

    return true;
  } catch (e) {
    return false;
  }
}

const EXTERNAL = /^\w[a-z\-0-9\.]+$/; // Match "react", "path", "fs", "lodash.random", etc.

function reconcilePackages(log = console.log) {
  const linkable = [];
  const fetchable = [];
  const local = [];

  log();
  log(' +local     (l)  packages in your project\n +external  (e)  referenced packages in node_modules but not in current project\n +missing   (m)  referenced packages but not found\n +symlinked (sl) symlinked external packages\n');
  for (let i in plugins) {
    let section = plugins[i];

    for (let name in section) {
      let version = section[name];

      let namespaced = name.charAt(0) === '@';
      let dep = name.split('/')
        .slice(0, namespaced ? 2 : 1)
        .join('/');

      // Ignore relative modules, which aren't installed by NPM
      if (!dep.match(EXTERNAL) && !namespaced) {
        return;
      }

      if (isInternal(dep)) {
        let stat = fs.lstatSync(path.join(dir, 'plugins', name));
        if (stat.isSymbolicLink()) {
          log(` sl ${name.cyan}`);
        } else {
          log(` l  ${name.cyan}`);
          local.push({name, version});
        }

        continue;
      }

      if (!existsInNodeModules(dep)) {
        log(` m  ${name.cyan}`);
        fetchable.push({name, version});
      } else {
        log(` e  ${name.cyan}`);
        linkable.push({name, version});
      }
    }
  }
  log();

  return {local, linkable, fetchable};
}

async function reconcileRemotePlugins({skipLocal, dryRun}) {
  console.log(`\n[${skipLocal ? '1/3' : '2/4'}] ${emoji.get('mag')} Reconciling plugins...`.yellow);
  const {linkable, fetchable} = reconcilePackages();

  console.log(`[${skipLocal ? '2/3' : '3/4'}] ${emoji.get('truck')} Fetching plugins...\n`.yellow);

  if (fetchable.length > 0) {

    console.log(`$ yarn add ${fetchable.map(({name, version}) => `${name}@${version}`.cyan)}`);

    if (!dryRun) {

      let args = [
        'add',
        ...fetchable.map(({name, version}) => `${name}@${version}`)
      ];

      let output = spawn.sync('yarn', args, {
        stdio: ['ignore', 'pipe', 'inherit']
      });

      if (output.status) {
        throw new Error('Could not install external plugins, errors occured during install');
      }

      console.log(output.stdout.toString());
    }

    fetchable.forEach((plugin) => {
      linkable.push(plugin);
    });
  }

  // TODO fetch the plugins using yarn

  console.log(`\n[${skipLocal ? '3/3' : '4/4'}] ${emoji.get('link')} Linking plugins...\n`.yellow);

  for (let i in linkable) {
    let {name} = linkable[i];

    let src = path.join(dir, 'node_modules', name);
    let dst = path.join(dir, 'plugins', name);

    console.log(`$ link ${src.cyan} -> ${dst.cyan}`);

    if (!dryRun) {

      // Create the symlink for the plugin directory.
      fs.symlinkSync(src, dst, 'dir');
    }
  }

  return {linkable, fetchable};
}

async function reconcileLocalPlugins({skipRemote, dryRun}) {
  console.log(`\n[${skipRemote ? '1/1' : '1/4'}] ${emoji.get('pick')} Installing local plugin dependencies...\n`.yellow);
  const {local} = reconcilePackages(() => {});

  for (let i in local) {
    let {name} = local[i];

    if (!fs.existsSync(path.join(dir, 'plugins', name, 'package.json'))) {
      continue;
    }

    let wd = path.join(dir, 'plugins', name);

    console.log(`$ cd ${wd.cyan} && yarn`);

    if (!dryRun) {
      let args = [];

      let output = spawn.sync('yarn', args, {
        stdio: ['ignore', 'pipe', 'inherit'],
        cwd: wd
      });

      if (output.status) {
        throw new Error('Could not install local plugin dependencies, errors occured during install');
      }

      console.log(output.stdout.toString());
    }
  }
}

// This traverses the local plugins and installs any dependencies listed there,
// this only is really needed for plugins that are installed via docker because
// core plugins will have their dependencies already included in core.
async function reconcilePluginDeps({skipLocal, skipRemote, dryRun}) {
  let startTime = new Date();

  // We don't need to do anything if we skip everything....
  if (skipLocal && skipRemote) {
    return;
  }

  // Traverse local plugins and install dependencies if enabled.
  if (!skipLocal) {
    await reconcileLocalPlugins({skipRemote, dryRun});
  }

  // Locate any external plugins and install them.
  if (!skipRemote) {
    let results = [];
    try {
      results = await reconcileRemotePlugins({skipLocal, skipRemote, dryRun});
    } catch (e) {
      throw e;
    }

    let status;
    if (dryRun) {
      status = '[dry-run] success'.green;
    } else {
      status = 'success'.green;
    }

    let message;
    if (results.linkable.length === 0 && results.fetchable.length === 0) {
      message = 'Already up-to-date.';
    } else if (results.linkable.length === 0) {
      message = `Fetched ${results.fetchable.length} new plugins.`;
    } else if (results.fetchable.length === 0) {
      message = `Linked ${results.linkable.length} new plugins.`;
    } else {
      message = `Fetched ${results.fetchable.length} new plugins, linked ${results.linkable.length} plugins.`;
    }

    console.log(`\n${status} ${message}`);
  }

  let endTime = new Date();

  let totalTime = ((endTime.getTime() - startTime.getTime()) / 1000).toFixed(2);
  console.log(`✨ Done in ${totalTime}s.`);
}

//==============================================================================
// Setting up the program command line arguments.
//==============================================================================

program
  .command('list')
  .description('')
  .action(reconcilePackages);

program
  .command('reconcile')
  .description('reconciles local plugin dependencies and downloads external plugins')
  .option('-d, --dry-run', 'does not actually change anything on the filesystem acts only as a simulation')
  .option('--skip-local', 'skips the local dependancy reconciliation')
  .option('--skip-remote', 'skips the remote plugin reconciliation')
  .action(reconcilePluginDeps);

program.parse(process.argv);

// If there is no command listed, output help.
if (!process.argv.slice(2).length) {
  program.outputHelp();
}