import { AnyObject } from '../types'

export default function mergeAttributes(...objects: AnyObject[]): AnyObject {
  return objects
    .filter(item => !!item)
    .reduce((items, item) => {
      const mergedAttributes = { ...items }

      Object.entries(item).forEach(([key, value]) => {
        const exists = mergedAttributes[key]

        if (!exists) {
          mergedAttributes[key] = value
          return
        }

        if (key === 'class') {
          mergedAttributes[key] = [mergedAttributes[key], value].join(' ')
        } else if (key === 'style') {
          mergedAttributes[key] = [mergedAttributes[key], value].join('; ')
        } else {
          mergedAttributes[key] = value
        }
      })

      return mergedAttributes
    }, {})
}