/* eslint no-prototype-builtins: 0 */

'use strict'

const chalk = require('chalk')
const format = require('stringify-object')
const intersection = require('lodash/intersection')
const defaultsDeep = require('lodash/defaultsDeep')
const isArray = require('lodash/isArray')
const isFunction = require('lodash/isFunction')
const isObject = require('lodash/isObject')
const isString = require('lodash/isString')
const isGlob = require('is-glob')
const yup = require('yup')

const debug = require('debug')('lint-staged:cfg')

/**
 * Default config object
 *
 * @type {{concurrent: boolean, chunkSize: number, globOptions: {matchBase: boolean, dot: boolean}, linters: {}, subTaskConcurrency: number, renderer: string}}
 */
const defaultConfig = {
  concurrent: true,
  chunkSize: Number.MAX_SAFE_INTEGER,
  globOptions: {
    matchBase: true,
    dot: true
  },
  linters: {},
  ignore: [],
  subTaskConcurrency: 1,
  renderer: 'update',
  relative: false
}

/**
 * Configuration schema to validate configuration
 */
const schema = yup.object().shape({
  concurrent: yup.boolean().default(defaultConfig.concurrent),
  chunkSize: yup
    .number()
    .positive()
    .default(defaultConfig.chunkSize),
  globOptions: yup.object().shape({
    matchBase: yup.boolean().default(defaultConfig.globOptions.matchBase),
    dot: yup.boolean().default(defaultConfig.globOptions.dot)
  }),
  linters: yup.object(),
  ignore: yup.array().of(yup.string()),
  subTaskConcurrency: yup
    .number()
    .positive()
    .integer()
    .default(defaultConfig.subTaskConcurrency),
  renderer: yup
    .mixed()
    .test(
      'renderer',
      "Should be 'update', 'verbose' or a function.",
      value => value === 'update' || value === 'verbose' || isFunction(value)
    ),
  relative: yup.boolean().default(defaultConfig.relative)
})

/**
 * Check if the config is "simple" i.e. doesn't contains any of full config keys
 *
 * @param config
 * @returns {boolean}
 */
function isSimple(config) {
  return (
    isObject(config) &&
    !config.hasOwnProperty('linters') &&
    intersection(Object.keys(defaultConfig), Object.keys(config)).length === 0
  )
}

const logDeprecation = (opt, helpMsg) =>
  console.warn(`● Deprecation Warning:

  Option ${chalk.bold(opt)} was removed.

  ${helpMsg}

  Please remove ${chalk.bold(opt)} from your configuration.

Please refer to https://github.com/okonet/lint-staged#configuration for more information...`)

const logUnknown = (opt, helpMsg, value) =>
  console.warn(`● Validation Warning:

  Unknown option ${chalk.bold(`"${opt}"`)} with value ${chalk.bold(
    format(value, { inlineCharacterLimit: Number.POSITIVE_INFINITY })
  )} was found in the config root.

  ${helpMsg}

Please refer to https://github.com/okonet/lint-staged#configuration for more information...`)

const formatError = helpMsg => `● Validation Error:

  ${helpMsg}

Please refer to https://github.com/okonet/lint-staged#configuration for more information...`

const createError = (opt, helpMsg, value) =>
  formatError(`Invalid value for '${chalk.bold(opt)}'.

  ${helpMsg}.
 
  Configured value is: ${chalk.bold(
    format(value, { inlineCharacterLimit: Number.POSITIVE_INFINITY })
  )}`)

/**
 * Reporter for unknown options
 * @param config
 * @param option
 * @returns {void}
 */
function unknownValidationReporter(config, option) {
  /**
   * If the unkonwn property is a glob this is probably
   * a typical mistake of mixing simple and advanced configs
   */
  if (isGlob(option)) {
    // prettier-ignore
    const message = `You are probably trying to mix simple and advanced config formats. Adding

  ${chalk.bold(`"linters": {
    "${option}": ${JSON.stringify(config[option])}
  }`)}

  will fix it and remove this message.`

    return logUnknown(option, message, config[option])
  }

  // If it is not glob pattern, simply notify of unknown value
  return logUnknown(option, '', config[option])
}

/**
 * For a given configuration object that we retrive from .lintstagedrc or package.json
 * construct a full configuration with all options set.
 *
 * This is a bit tricky since we support 2 different syntxes: simple and full
 * For simple config, only the `linters` configuration is provided.
 *
 * @param {Object} sourceConfig
 * @returns {{
 *  concurrent: boolean, chunkSize: number, globOptions: {matchBase: boolean, dot: boolean}, linters: {}, subTaskConcurrency: number, renderer: string
 * }}
 */
function getConfig(sourceConfig, debugMode) {
  debug('Normalizing config')
  const config = defaultsDeep(
    {}, // Do not mutate sourceConfig!!!
    isSimple(sourceConfig) ? { linters: sourceConfig } : sourceConfig,
    defaultConfig
  )

  // Check if renderer is set in sourceConfig and if not, set accordingly to verbose
  if (isObject(sourceConfig) && !sourceConfig.hasOwnProperty('renderer')) {
    config.renderer = debugMode ? 'verbose' : 'update'
  }

  return config
}

/**
 * Runs config validation. Throws error if the config is not valid.
 * @param config {Object}
 * @returns config {Object}
 */
function validateConfig(config) {
  debug('Validating config')

  const deprecatedConfig = {
    gitDir: "lint-staged now automatically resolves '.git' directory.",
    verbose: `Use the command line flag ${chalk.bold('--debug')} instead.`
  }

  const errors = []

  try {
    schema.validateSync(config, { abortEarly: false, strict: true })
  } catch (error) {
    error.errors.forEach(message => errors.push(formatError(message)))
  }

  if (isObject(config.linters)) {
    Object.keys(config.linters).forEach(key => {
      if (
        (!isArray(config.linters[key]) || config.linters[key].some(item => !isString(item))) &&
        !isString(config.linters[key])
      ) {
        errors.push(
          createError(`linters[${key}]`, 'Should be a string or an array of strings', key)
        )
      }
    })
  }

  Object.keys(config)
    .filter(key => !defaultConfig.hasOwnProperty(key))
    .forEach(option => {
      if (deprecatedConfig.hasOwnProperty(option)) {
        logDeprecation(option, deprecatedConfig[option])
        return
      }

      unknownValidationReporter(config, option)
    })

  if (errors.length) {
    throw new Error(errors.join('\n'))
  }

  return config
}

module.exports = {
  getConfig,
  validateConfig
}