import { PluginMetaLoader } from '@squeebot/core/lib/plugin';
import { takeChecksum } from '@squeebot/core/lib/util';
import fs from 'fs-extra';
import path from 'path';
import tar from 'tar';

import { defaultEnvironment } from '../default/environment.default';
import { execute } from '../execute';
import { REPOSITORY_SCHEMA } from './constants';
import { deploy } from './deploy';

/**
 * Build repository ready for deployment
 * @param location Repository location
 * @param out Create output files for deployment (false - only compile tsc in-place)
 * @param doDeploy Deployment name
 * @param onlyDeploy Deploy only without building
 */
export async function buildRepository(
  location?: string,
  out = true,
  doDeploy?: string,
  onlyDeploy = false
): Promise<void> {

  if (!location) {
    location = process.cwd();
  }

  location = path.resolve(process.cwd(), location);
  const outDir = path.join(location, '.out');

  // Check for repository metadata
  const buildMetaFile = path.join(location, 'squeebot.repo.json');
  if (!await fs.pathExists(buildMetaFile)) {
    throw new Error(`${location} is not a valid squeebot repository development environment!`);
  }

  // Read repository metadata
  const meta = await fs.readJson(buildMetaFile);
  const env = defaultEnvironment(location);
  env.pluginsPath = location;

  if (!meta.name) {
    throw new Error(`${location} is not a valid squeebot repository development environment!`);
  }

  console.log('Detected repository "%s"!', meta.name);

  if (onlyDeploy) {
    if (!await fs.pathExists(outDir)) {
      throw new Error('You need to build before deploying!');
    } else {
      return deploy(meta.name, location, outDir, doDeploy as string);
    }
  }

  // Run typescript build
  if (meta.typescript) {
    console.log('Running build task..');
    await execute(['npm', 'run', 'build'], location);
  }

  console.log('Detecting plugins in this environment..');

  const loader = new PluginMetaLoader(env);
  const plugins = await loader.loadAll(false);

  console.log('Found the following plugins:', plugins.map((plugin) => {
    return `${plugin.name}@${plugin.version}`;
  }).join(', '));

  const savedList = plugins.map((plugin) => ({
    name: plugin.name,
    version: plugin.version,
  }));

  meta.plugins = savedList;
  await fs.writeJson(buildMetaFile, meta, { spaces: 2 });

  if (!out) {
    console.log('Done!');
    return;
  }

  await fs.remove(outDir);
  await fs.ensureDir(outDir);

  console.log('Copying plugins');
  for (const plugin of plugins) {
    const src = path.join(location, plugin.name);
    const dst = path.join(outDir, plugin.name);
    await fs.copy(src, dst);
  }

  if (meta.typescript) {
    console.log('Stripping TypeScript source files');
    for (const plugin of plugins) {
      const plOut = path.join(outDir, plugin.name);
      const listAllFiles = await fs.readdir(plOut);
      for (const f of listAllFiles) {
        if (f.match(/(\.d)?\.ts$/i) != null) {
          await fs.remove(path.join(plOut, f));
        }
      }
    }
  }

  console.log('Copying configuration schemas');
  for (const plugin of plugins) {
    const plOut = path.join(outDir, plugin.name);
    const schemaFile = path.join(plOut, 'schema.json');
    const outSchemaFile = path.join(outDir, `${plugin.name}.schema.json`);
    if (await fs.pathExists(schemaFile)) {
      await fs.copy(schemaFile, outSchemaFile);
    }
  }

  console.log('Creating tarballs');
  for (const plugin of plugins) {
    const plOut = path.join(outDir, plugin.name);
    const fileName = `${plOut}.plugin.tgz`;
    await tar.c({
      gzip: true,
      file: fileName,
      C: outDir,
    }, [plugin.name]);

    // Create checksum of tarball
    const checksum = await takeChecksum(fileName);
    const metaPlugin = meta.plugins.find((item: { name: string }) => item.name === plugin.name);
    if (metaPlugin && checksum) {
      metaPlugin.checksum = checksum;
    }
  }

  console.log('Creating repository index');
  await fs.writeJSON(path.join(outDir, 'repository.json'), {
    created: Math.floor(Date.now() / 1000),
    name: meta.name,
    plugins: meta.plugins,
    $schema: REPOSITORY_SCHEMA,
  });

  if (doDeploy == null) {
    console.log('Done!');
    return;
  }

  deploy(meta.name, location, outDir, doDeploy);
}