<script setup lang="ts">
import type { ListboxRootEmits, ListboxRootProps } from 'reka-ui'
import type { HTMLAttributes } from 'vue'
import { reactiveOmit } from '@vueuse/core'
import { ListboxRoot, useFilter, useForwardPropsEmits } from 'reka-ui'
import { reactive, ref, watch } from 'vue'
import { cn } from '@/lib/utils'
import { provideCommandContext } from '.'

const props = withDefaults(defineProps<ListboxRootProps & { class?: HTMLAttributes['class'] }>(), {
    modelValue: '',
})

const emits = defineEmits<ListboxRootEmits>()

const delegatedProps = reactiveOmit(props, 'class')

const forwarded = useForwardPropsEmits(delegatedProps, emits)

const allItems = ref<Map<string, string>>(new Map())
const allGroups = ref<Map<string, Set<string>>>(new Map())

const { contains } = useFilter({ sensitivity: 'base' })
const filterState = reactive({
    search: '',
    filtered: {
        /** The count of all visible items. */
        count: 0,
        /** Map from visible item id to its search score. */
        items: new Map() as Map<string, number>,
        /** Set of groups with at least one visible item. */
        groups: new Set() as Set<string>,
    },
})

function filterItems() {
    if (!filterState.search) {
        filterState.filtered.count = allItems.value.size
        // Do nothing, each item will know to show itself because search is empty
        return
    }

    // Reset the groups
    filterState.filtered.groups = new Set()
    let itemCount = 0

    // Check which items should be included
    for (const [id, value] of allItems.value) {
        const score = contains(value, filterState.search)
        filterState.filtered.items.set(id, score ? 1 : 0)
        if (score) itemCount++
    }

    // Check which groups have at least 1 item shown
    for (const [groupId, group] of allGroups.value) {
        for (const itemId of group) {
            if (filterState.filtered.items.get(itemId)! > 0) {
                filterState.filtered.groups.add(groupId)
                break
            }
        }
    }

    filterState.filtered.count = itemCount
}

watch(
    () => filterState.search,
    () => {
        filterItems()
    }
)

provideCommandContext({
    allItems,
    allGroups,
    filterState,
})
</script>

<template>
    <ListboxRoot
        data-slot="command"
        v-bind="forwarded"
        :class="cn('bg-popover text-popover-foreground flex h-full w-full flex-col overflow-hidden rounded-md', props.class)"
    >
        <slot />
    </ListboxRoot>
</template>
