import chalk from 'chalk'
// Load environment variables
import dotenv from 'dotenv'
dotenv.config()

const port = process.env.API_PORT || 3000
// Construct config object
const config = {
  port,
  api: process.env.API_URL || `http://localhost:${port}`,
  website: {
    domain: process.env.API_WEBSITE_DOMAIN || 'freesewing.org',
    scheme: process.env.API_WEBSITE_SCHEME || 'https',
  },
  db: {
    url: process.env.API_DB_URL,
  },
  static: process.env.API_STATIC,
  storage: process.env.API_STORAGE,
  hashing: {
    saltRounds: 10,
  },
  encryption: {
    key: process.env.API_ENC_KEY,
  },
  jwt: {
    secretOrKey: process.env.API_ENC_KEY,
    issuer: process.env.API_JWT_ISSUER,
    audience: process.env.API_JWT_ISSUER,
    expiresIn: process.env.API_JWT_EXPIRY || '36 days',
  },
  languages: ['en', 'de', 'es', 'fr', 'nl'],
  ses: {},
  oauth: {
    github: {
      clientId: process.env.API_GITHUB_CLIENT_ID,
      clientSecret: process.env.API_GITHUB_CLIENT_SECRET,
      tokenUri: 'https://github.com/login/oauth/access_token',
      dataUri: 'https://api.github.com/user',
      emailUri: 'https://api.github.com/user/emails',
    },
    google: {
      clientId: process.env.API_GOOGLE_CLIENT_ID,
      clientSecret: process.env.API_GOOGLE_CLIENT_SECRET,
      tokenUri: 'https://oauth2.googleapis.com/token',
      dataUri:
        'https://people.googleapis.com/v1/people/me?personFields=emailAddresses,names,photos',
    },
  },
  github: {
    token: process.env.API_GITHUB_TOKEN,
    api: 'https://api.github.com',
    bot: {
      user: process.env.API_GITHUB_USER || 'freesewing-robot',
      name: process.env.API_GITHUB_USER_NAME || 'Freesewing bot',
      email: process.env.API_GITHUB_USER_EMAIL || 'bot@freesewing.org',
    },
    notify: {
      specific: {
        albert: ['woutervdub'],
        bee: ['bobgeorgethe3rd'],
        benjamin: ['woutervdub'],
        cornelius: ['woutervdub'],
        diana: ['alfalyr'],
        holmes: ['alfalyr'],
        hortensia: ['woutervdub'],
        lunetius: ['starfetch'],
        penelope: ['woutervdub'],
        tiberius: ['starfetch'],
        sandy: ['alfalyr'],
        ursula: ['nataliasayang'],
        yuri: ['biou', 'hellgy'],
        walburga: ['starfetch'],
        waralee: ['woutervdub'],
      },
      dflt: [process.env.API_GITHUB_NOTIFY_DEFAULT_USER || 'joostdecock'],
    },
  },
}

/*
 * This method is how you load the config.
 *
 * It will verify whether whether everyting is setup correctly
 * which is not a given since there's a number of environment
 * variables that need to be set for this backend to function.
 */
export function verifyConfig() {
  const nonEmptyString = (input) => {
    if (typeof input === 'string' && input.length > 0) return true
    return false
  }
  const warnings = []
  const errors = []

  /*
   * Required (error when missing)
   */

  // Database
  if (!nonEmptyString(config.db.url)) errors.push({ e: 'API_DB_URL', i: './dev.sqlite' })

  // Encryption
  //if (!nonEmptyString(config.encryption.key)) errors.push({ e: 'FS_ENC_KEY', i: 'encryption' })

  /*
   * Wanted (warning when missing)
   */
  // API
  //if (!nonEmptyString(config.api)) warnings.push({ e: 'FS_BACKEND', i: 'api' })

  // Site
  //if (!nonEmptyString(config.api)) warnings.push({ e: 'FS_SITE', i: 'site' })

  // SMTP
  //if (!nonEmptyString(config.smtp.host)) warnings.push({ e: 'FS_SMTP_HOST', i: 'smtp' })

  //if (!nonEmptyString(config.smtp.user)) warnings.push({ e: 'FS_SMTP_USER', i: 'smtp' })

  //if (!nonEmptyString(config.smtp.pass)) warnings.push({ e: 'FS_SMTP_PASS', i: 'smtp' })

  // OAUTH
  //if (!nonEmptyString(config.oauth.github.clientId))
  //  warnings.push({ e: 'FS_GITHUB_CLIENT_ID', i: 'oauth' })

  //if (!nonEmptyString(config.oauth.github.clientSecret))
  //  warnings.push({ e: 'FS_GITHUB_CLIENT_SECRET', i: 'oauth' })

  //if (!nonEmptyString(config.oauth.google.clientId))
  //  warnings.push({ e: 'FS_GOOGLE_CLIENT_ID', i: 'oauth' })

  //if (!nonEmptyString(config.oauth.google.clientSecret))
  //  warnings.push({ e: 'FS_GOOGLE_CLIENT_SECRET', i: 'oauth' })

  for (let { e, i } of warnings) {
    console.log(
      chalk.yellow('Warning:'),
      'Missing',
      chalk.yellow(e),
      "environment variable. Some features won't be available.",
      '\n',
      chalk.yellow('See: '),
      chalk.yellow.bold('https://dev.freesewing.org/backend/configuration#' + i),
      '\n'
    )
  }

  for (let { e, i } of errors) {
    console.log(
      chalk.redBright('Error:'),
      'Required environment variable',
      chalk.redBright(e),
      "is missing. The backend won't start without it.",
      '\n',
      chalk.yellow('See: '),
      chalk.yellow.bold('https://dev.freesewing.org/backend/configuration#' + i),
      '\n'
    )
  }

  if (errors.length > 0) {
    console.log(chalk.redBright('Invalid configuration. Stopping here...'))
    return process.exit(1)
  }

  if (process.env.API_DUMP_CONFIG_AT_STARTUP) {
    console.log(
      'Dumping configuration:',
      JSON.stringify(
        {
          ...config,
          encryption: {
            ...config.encryption,
            key:
              config.encryption.key.slice(0, 4) + '[ REDACTED ]' + config.encryption.key.slice(-4),
          },
          jwt: {
            secretOrKey:
              config.jwt.secretOrKey.slice(0, 4) +
              '[ REDACTED ]' +
              config.jwt.secretOrKey.slice(-4),
          },
        },
        null,
        2
      )
    )
  }

  return config
}