/*
 * 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 { isValidElement, Children, Component, ReactElement } from 'react'

import { View } from '@instructure/ui-view/latest'
import { safeCloneElement } from '@instructure/ui-react-utils'

import { withStyle } from '@instructure/emotion'
import { ChevronRightInstUIIcon } from '@instructure/ui-icons'
import { BreadcrumbLink } from './BreadcrumbLink'

import generateStyle from './styles'

import { allowedProps } from './props'
import type { BreadcrumbProps } from './props'

/**
---
category: components
---
**/

@withStyle(generateStyle)
class Breadcrumb extends Component<BreadcrumbProps> {
  static readonly componentId = 'Breadcrumb'

  static allowedProps = allowedProps
  static defaultProps = {
    size: 'medium',
    children: null
  }

  ref: Element | null = null

  handleRef = (el: Element | null) => {
    this.ref = el
  }

  addAriaCurrent = (child: React.ReactNode) => {
    const updatedChild = safeCloneElement(
      child as React.ReactElement<{ 'aria-current'?: string }>,
      {
        'aria-current': 'page'
      }
    )
    return updatedChild
  }

  componentDidMount() {
    this.props.makeStyles?.()
  }

  componentDidUpdate() {
    this.props.makeStyles?.()
  }

  static Link = BreadcrumbLink

  renderChildren() {
    const { styles, children, size } = this.props
    const numChildren = Children.count(children)
    const inlineStyle = {
      maxWidth: `${Math.floor(100 / numChildren)}%`
    }
    let isAriaCurrentSet = false

    return Children.map(children, (child, index) => {
      const isLastElement = index === numChildren - 1
      if (isValidElement(child)) {
        const isCurrentPage =
          (child as ReactElement<any>).props.isCurrentPage || false
        if (isAriaCurrentSet && isCurrentPage) {
          console.warn(
            `Warning: Multiple elements with isCurrentPage=true found. Only one element should be set to current.`
          )
        }
        if (isCurrentPage) {
          isAriaCurrentSet = true
        }
      }

      // Clone child (BreadcrumbLink) and pass size prop
      const childWithSize = isValidElement(child)
        ? safeCloneElement(child as ReactElement<any>, { size })
        : child

      // Map Breadcrumb sizes to icon size tokens
      const breadcrumbSizeToIconSize = {
        small: 'sm',
        medium: 'md',
        large: 'lg'
      } as const

      const iconSize = breadcrumbSizeToIconSize[size || 'small']

      return (
        <>
          <li css={styles?.crumb} style={inlineStyle}>
            {!isAriaCurrentSet &&
            isLastElement &&
            (child as React.ReactElement<any>).props.isCurrentPage !== false
              ? this.addAriaCurrent(childWithSize)
              : childWithSize}
          </li>
          {index < numChildren - 1 && (
            <li aria-hidden="true" css={styles?.separator}>
              <ChevronRightInstUIIcon size={iconSize} color={'mutedColor'} />
            </li>
          )}
        </>
      )
    })
  }

  render() {
    const { styles } = this.props

    return (
      <View
        role="navigation"
        as="div"
        margin={this.props.margin}
        aria-label={this.props.label}
        elementRef={this.handleRef}
        data-cid="Breadcrumb"
      >
        <ol css={styles?.breadcrumb}>{this.renderChildren()}</ol>
      </View>
    )
  }
}

export default Breadcrumb
export { Breadcrumb, BreadcrumbLink }