/**
 * This file is copied from the react-navigation repo:
 * https://github.com/react-navigation/react-navigation/blob/%40react-navigation/core%407.1.2/packages/core/src/validatePathConfig.tsx
 *
 * Please refrain from making changes to this file, as it will make merging updates from the upstream harder.
 * All modifications except formatting should be marked with `// @modified` comment.
 */

const formatToList = (items: Record<string, string>) =>
  Object.entries(items)
    .map(([key, value]) => `- ${key} (${value})`)
    .join('\n')

export function validatePathConfig(config: unknown, root = true) {
  const validation = {
    path: 'string',
    initialRouteName: 'string',
    screens: 'object',
    // @modified - start
    preserveDynamicRoutes: 'boolean',
    preserveGroups: 'boolean',
    // @modified - end
    ...(root
      ? null
      : {
          exact: 'boolean',
          stringify: 'object',
          parse: 'object',
        }),
  }

  if (typeof config !== 'object' || config === null) {
    throw new Error(
      `Expected the configuration to be an object, but got ${JSON.stringify(config)}.`
    )
  }

  const validationErrors = Object.fromEntries(
    Object.keys(config)
      .map((key) => {
        if (key in validation) {
          const type = validation[key as keyof typeof validation] as string
          const value: string = config[key]

          if (value !== undefined && typeof value !== type) {
            return [key, `expected '${type}', got '${typeof value}'`]
          }
        } else {
          return [key, 'extraneous']
        }

        return null
      })
      .filter(Boolean) as [string, string][]
  )

  if (Object.keys(validationErrors).length) {
    throw new Error(
      `Found invalid properties in the configuration:\n${formatToList(
        validationErrors
      )}\n\nYou can only specify the following properties:\n${formatToList(
        validation
      )}\n\nIf you want to specify configuration for screens, you need to specify them under a 'screens' property.\n\nSee https://reactnavigation.org/docs/configuring-links for more details on how to specify a linking configuration.`
    )
  }

  if (
    root &&
    'path' in config &&
    typeof config.path === 'string' &&
    config.path.includes(':')
  ) {
    throw new Error(
      `Found invalid path '${config.path}'. The 'path' in the top-level configuration cannot contain patterns for params.`
    )
  }

  if ('screens' in config && config.screens) {
    Object.entries(config.screens).forEach(([_, value]) => {
      if (typeof value !== 'string') {
        validatePathConfig(value, false)
      }
    })
  }
}