/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 - present Instructure, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
import type {
  BaseTheme,
  BaseThemeVariableKeys
} from '@instructure/shared-types'

const baseThemeProps: BaseThemeVariableKeys = [
  'borders',
  'breakpoints',
  'colors',
  'forms',
  'media',
  'shadows',
  'spacing',
  'stacking',
  'transitions',
  'typography'
]

/**
 * Checks if the given param is an object with all the keys needed for an
 * Instructure theme.
 * @param theme Anything. This function will throw an error if it's not a theme
 * object.
 */
const isBaseTheme = (theme: any): theme is BaseTheme => {
  if (Array.isArray(theme) || typeof theme === 'function') {
    throw new Error()
  }

  try {
    return (
      'key' in (theme as BaseTheme) &&
      baseThemeProps.every((prop) => prop in theme)
    )
  } catch {
    throw new Error()
  }
}

export default isBaseTheme
export { isBaseTheme }