// eslint-disable-next-line no-unused

import { FontAwesomeIcon as FAIcon } from '@fortawesome/vue-fontawesome'
import { mapState } from 'pinia'
import { Fragment, h } from 'vue'

import './tab_switcher.scss'
import { useInterfaceStore } from 'src/stores/interface'

const findFirstUsable = (slots) => slots.findIndex((_) => _.props)

export default {
  name: 'TabSwitcher',
  props: {
    renderOnlyFocused: {
      required: false,
      type: Boolean,
      default: false,
    },
    onSwitch: {
      required: false,
      type: Function,
      default: undefined,
    },
    activeTab: {
      required: false,
      type: String,
      default: undefined,
    },
    scrollableTabs: {
      required: false,
      type: Boolean,
      default: false,
    },
    bodyScrollLock: {
      required: false,
      type: Boolean,
      default: false,
    },
  },
  data() {
    return {
      active: findFirstUsable(this.slots()),
    }
  },
  computed: {
    activeIndex() {
      // In case of controlled component
      if (this.activeTab) {
        return this.slots().findIndex(
          (slot) => slot && slot.props && this.activeTab === slot.props.key,
        )
      } else {
        return this.active
      }
    },
    isActive() {
      return (tabName) => {
        const isWanted = (slot) =>
          slot.props && slot.props['data-tab-name'] === tabName
        return this.$slots.default().findIndex(isWanted) === this.activeIndex
      }
    },
  },
  beforeUpdate() {
    const currentSlot = this.slots()[this.active]
    if (!currentSlot.props) {
      this.active = findFirstUsable(this.slots())
    }
  },
  methods: {
    clickTab(index) {
      return (e) => {
        e.preventDefault()
        this.setTab(index)
      }
    },
    // DO NOT put it to computed, it doesn't work (caching?)
    slots() {
      if (this.$slots.default()[0].type === Fragment) {
        return this.$slots.default()[0].children
      }
      return this.$slots.default()
    },
    setTab(index) {
      if (typeof this.onSwitch === 'function') {
        this.onSwitch.call(null, this.slots()[index].key)
      }
      this.active = index
      if (this.scrollableTabs) {
        this.$refs.contents.scrollTop = 0
      }
    },
  },
  render() {
    const tabs = this.slots().map((slot, index) => {
      const props = slot.props
      if (!props) return
      const classesTab = ['tab']
      const classesWrapper = ['tab-wrapper']
      if (this.activeIndex === index) {
        classesTab.push('active')
        classesWrapper.push('active')
      }
      if (props.image) {
        return (
          <div class={classesWrapper.join(' ')}>
            <button
              disabled={props.disabled}
              onClick={this.clickTab(index)}
              class={classesTab.join(' ')}
              type="button"
              role="tab"
            >
              <img src={props.image} title={props['image-tooltip']} />
              {props.label ? '' : props.label}
            </button>
          </div>
        )
      }
      return (
        <div class={classesWrapper.join(' ')}>
          <button
            disabled={props.disabled}
            onClick={this.clickTab(index)}
            class={classesTab.join(' ')}
            type="button"
            role="tab"
          >
            {!props.icon ? (
              ''
            ) : (
              <FAIcon
                class="tab-icon"
                size="2x"
                fixed-width
                icon={props.icon}
              />
            )}
            <span class="text">{props.label}</span>
          </button>
        </div>
      )
    })

    const contents = this.slots().map((slot, index) => {
      const props = slot.props
      if (!props) return
      const active = this.activeIndex === index
      const classes = [active ? 'active' : 'hidden']
      if (props.fullHeight || props['full-height']) {
        classes.push('-full-height')
      }
      if (props.fullWidth || props['full-width']) {
        classes.push('-full-width')
      }
      let delayRender = slot.props['delay-render']
      if (delayRender && active) {
        slot.props['delay-render'] = false
        delayRender = false
      }
      const renderSlot =
        !delayRender && (!this.renderOnlyFocused || active) ? slot : ''

      return <div class={classes}>{renderSlot}</div>
    })

    return (
      <div class="tab-switcher top-tabs" ref="root">
        <div class="tabs" role="tablist" ref="nav">
          {tabs}
        </div>
        <div
          role="tabpanel"
          class={'contents' + (this.scrollableTabs ? ' scrollable-tabs' : '')}
          v-body-scroll-lock={this.bodyScrollLock}
          ref="content"
        >
          {contents}
        </div>
      </div>
    )
  },
}