<template>
  <transition name="fade">
    <div
      v-show="shown"
      ref="contextMenu"
      class="context-menu"
      :style="{
        left: left,
        top: top,
      }"
    >
      <div v-for="(option, index) in options" :key="index" @click.stop="optionClicked(option.name)">
        <hr v-if="option.type === 'divider'" class="divider" />
        <div
          v-else-if="!(isLinkedData(item) && option.name === `add_content`)"
          class="item clickable"
          :class="[option.color ?? 'base']"
        >
          <slot :name="option.name" />
        </div>
      </div>
    </div>
  </transition>
</template>

<script setup>
import { onBeforeUnmount, onMounted, ref } from 'vue'

const emit = defineEmits(['menu-closed', 'option-clicked'])

const item = ref(null)
const contextMenu = ref(null)
const options = ref([])
const left = ref('0px')
const top = ref('0px')
const shown = ref(false)

defineExpose({
  showMenu: (event, passedItem, passedOptions) => {
    item.value = passedItem
    options.value = passedOptions

    const menuWidth = contextMenu.value.clientWidth
    const menuHeight = contextMenu.value.clientHeight

    if (menuWidth + event.pageX >= window.innerWidth) {
      left.value = event.pageX - menuWidth + 2 + 'px'
    } else {
      left.value = event.pageX - 2 + 'px'
    }

    if (menuHeight + event.pageY >= window.innerHeight) {
      top.value = event.pageY - menuHeight + 2 + 'px'
    } else {
      top.value = event.pageY - 2 + 'px'
    }

    shown.value = true
  },
})

const isLinkedData = (item) => {
  if (item.instance != undefined && item.instance.metadata.linked_data) {
    return true
  } else if (item.metadata != undefined && item.metadata.linked_data) {
    return true
  }
  return false
}

const hideContextMenu = () => {
  shown.value = false
  emit('menu-closed')
}

const optionClicked = (option) => {
  emit('option-clicked', {
    item: item.value,
    option: option,
  })
  hideContextMenu()
}

const onEscKeyRelease = (event) => {
  if (event.keyCode === 27) {
    hideContextMenu()
  }
}

const handleClickOutside = (event) => {
  const elements = document.elementsFromPoint(event.clientX, event.clientY)
  if (
    contextMenu.value &&
    contextMenu.value.$el !== event.target &&
    !elements.includes(contextMenu.value.$el)
  ) {
    hideContextMenu()
  }
}

onMounted(() => {
  window.addEventListener('click', handleClickOutside)
  document.body.addEventListener('keyup', onEscKeyRelease)
})

onBeforeUnmount(() => {
  window.removeEventListener('click', handleClickOutside)
  document.removeEventListener('keyup', onEscKeyRelease)
})
</script>

<style lang="scss" scoped>
.context-menu {
  background-color: var(--color-raised-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-floating);
  border: 1px solid var(--color-button-bg);
  margin: 0;
  position: fixed;
  z-index: 1000000;
  overflow: hidden;
  padding: var(--gap-sm);

  .item {
    align-items: center;
    color: var(--color-base);
    cursor: pointer;
    display: flex;
    gap: var(--gap-sm);
    padding: var(--gap-sm);
    border-radius: var(--radius-sm);

    &:hover,
    &:active {
      &.base {
        background-color: var(--color-button-bg);
        color: var(--color-contrast);
      }

      &.primary {
        background-color: var(--color-brand);
        color: var(--color-accent-contrast);
        font-weight: bold;
      }

      &.danger {
        background-color: var(--color-red);
        color: var(--color-accent-contrast);
        font-weight: bold;
      }

      &.contrast {
        background-color: var(--color-orange);
        color: var(--color-accent-contrast);
        font-weight: bold;
      }
    }
  }

  .divider {
    border: 1px solid var(--color-button-bg);
    margin: var(--gap-sm);
    pointer-events: none;
  }
}

.fade-enter-active,
.fade-leave-active {
  transition: opacity 0.2s ease-in-out;
}

.fade-enter-from,
.fade-leave-to {
  opacity: 0;
}
</style>
