// @flow
import type {
  CSSCharsetRule,
  CSSImportRule,
  CSSNamespaceRule,
  RuleOptions,
  JssStyle,
  ToCssOptions,
  BaseRule
} from '../types'

export class SimpleRule implements BaseRule {
  type: string = 'simple'

  key: string

  value: string | Array<string>

  options: RuleOptions

  isProcessed: boolean = false

  renderable: ?CSSCharsetRule | CSSImportRule | CSSNamespaceRule

  constructor(key: string, value: string, options: RuleOptions) {
    this.key = key
    this.value = value
    this.options = options
  }

  /**
   * Generates a CSS string.
   */
  // eslint-disable-next-line no-unused-vars
  toString(options?: ToCssOptions): string {
    if (Array.isArray(this.value)) {
      let str = ''
      for (let index = 0; index < this.value.length; index++) {
        str += `${this.key} ${this.value[index]};`
        if (this.value[index + 1]) str += '\n'
      }
      return str
    }

    return `${this.key} ${this.value};`
  }
}

const keysMap = {
  '@charset': true,
  '@import': true,
  '@namespace': true
}

export default {
  onCreateRule(key: string, value: JssStyle, options: RuleOptions): SimpleRule | null {
    return key in keysMap ? new SimpleRule(key, value, options) : null
  }
}