import Notification from '../vc-notification'
import Icon from '../icon'

let defaultDuration = 3
let defaultTop = null
let messageInstance = null
let key = 1
let prefixCls = 'ant-message'
let getContainer = () => document.body

function getMessageInstance (callback) {
  if (messageInstance) {
    callback(messageInstance)
    return
  }
  Notification.newInstance({
    prefixCls,
    transitionName: 'move-up',
    style: { top: defaultTop }, // 覆盖原来的样式
    getContainer,
  }, (instance) => {
    if (messageInstance) {
      callback(messageInstance)
      return
    }
    messageInstance = instance
    callback(instance)
  })
}

// type NoticeType = 'info' | 'success' | 'error' | 'warning' | 'loading';

function notice (
  content,
  duration,
  type,
  onClose,
) {
  const iconType = ({
    info: 'info-circle',
    success: 'check-circle',
    error: 'cross-circle',
    warning: 'exclamation-circle',
    loading: 'loading',
  })[type]

  if (typeof duration === 'function') {
    onClose = duration
    duration = defaultDuration
  }

  const target = key++
  getMessageInstance((instance) => {
    instance.notice({
      key: target,
      duration,
      style: {},
      content: (h) => (
        <div class={`${prefixCls}-custom-content ${prefixCls}-${type}`}>
          <Icon type={iconType} />
          <span>{typeof content === 'function' ? content(h) : content}</span>
        </div>
      ),
      onClose,
    })
  })
  return () => {
    if (messageInstance) {
      messageInstance.removeNotice(target)
    }
  }
}

// type ConfigContent = React.ReactNode | string;
// type ConfigDuration = number | (() => void);
// export type ConfigOnClose = () => void;

// export interface ConfigOptions {
//   top?: number;
//   duration?: number;
//   prefixCls?: string;
//   getContainer?: () => HTMLElement;
// }

export default {
  info (content, duration, onClose) {
    return notice(content, duration, 'info', onClose)
  },
  success (content, duration, onClose) {
    return notice(content, duration, 'success', onClose)
  },
  error (content, duration, onClose) {
    return notice(content, duration, 'error', onClose)
  },
  // Departed usage, please use warning()
  warn (content, duration, onClose) {
    return notice(content, duration, 'warning', onClose)
  },
  warning (content, duration, onClose) {
    return notice(content, duration, 'warning', onClose)
  },
  loading (content, duration, onClose) {
    return notice(content, duration, 'loading', onClose)
  },
  config (options) {
    if (options.top !== undefined) {
      defaultTop = options.top
      messageInstance = null // delete messageInstance for new defaultTop
    }
    if (options.duration !== undefined) {
      defaultDuration = options.duration
    }
    if (options.prefixCls !== undefined) {
      prefixCls = options.prefixCls
    }
    if (options.getContainer !== undefined) {
      getContainer = options.getContainer
    }
  },
  destroy () {
    if (messageInstance) {
      messageInstance.destroy()
      messageInstance = null
    }
  },
}