"use client"

import * as React from "react"
import { Combobox as ComboboxPrimitive } from "@base-ui/react"
import { CheckIcon, ChevronDownIcon, XIcon } from "lucide-react"

import { cn } from "@/lib/utils"
import { Button } from "@/components/ui/button"
import {
  InputGroup,
  InputGroupAddon,
  InputGroupButton,
  InputGroupInput,
} from "@/components/ui/input-group"

function isGroupedItems(
  items: readonly unknown[]
): items is ReadonlyArray<{ items: readonly unknown[] }> {
  return (
    items.length > 0 &&
    typeof items[0] === "object" &&
    items[0] !== null &&
    "items" in items[0]
  )
}

function Combobox<Value, Multiple extends boolean | undefined = false>({
  items,
  multiple,
  value,
  isItemEqualToValue,
  ...props
}: ComboboxPrimitive.Root.Props<Value, Multiple>) {
  // In multi-select mode, once an option is chosen it's represented as a
  // chip, so it's removed from the dropdown list instead of staying there
  // with a checkmark.
  const filteredItems = React.useMemo(() => {
    if (!multiple || !items) return items

    const selected = value as unknown as Value[] | null | undefined
    if (!Array.isArray(selected) || selected.length === 0) return items

    const isEqual =
      isItemEqualToValue ?? ((a: Value, b: Value) => Object.is(a, b))
    const isNotSelected = (item: Value) =>
      !selected.some((selectedValue) => isEqual(item, selectedValue))

    if (isGroupedItems(items)) {
      return items.map((group) => ({
        ...group,
        items: group.items.filter((item) => isNotSelected(item as Value)),
      }))
    }

    return (items as readonly Value[]).filter(isNotSelected)
  }, [items, multiple, value, isItemEqualToValue])

  return (
    <ComboboxPrimitive.Root
      items={filteredItems}
      multiple={multiple}
      value={value}
      isItemEqualToValue={isItemEqualToValue}
      {...props}
    />
  )
}

function ComboboxValue({ ...props }: ComboboxPrimitive.Value.Props) {
  return <ComboboxPrimitive.Value data-slot="combobox-value" {...props} />
}

function ComboboxTrigger({
  className,
  children,
  ...props
}: ComboboxPrimitive.Trigger.Props) {
  return (
    <ComboboxPrimitive.Trigger
      data-slot="combobox-trigger"
      className={cn("[&_svg:not([class*='size-'])]:size-4", className)}
      {...props}
    >
      {children}
      <ChevronDownIcon
        data-slot="combobox-trigger-icon"
        className="pointer-events-none size-4 text-muted-foreground"
      />
    </ComboboxPrimitive.Trigger>
  )
}

function ComboboxClear({ className, ...props }: ComboboxPrimitive.Clear.Props) {
  return (
    <ComboboxPrimitive.Clear
      data-slot="combobox-clear"
      render={<InputGroupButton variant="ghost" size="icon-xs" />}
      className={cn(className)}
      {...props}
    >
      <XIcon className="pointer-events-none" />
    </ComboboxPrimitive.Clear>
  )
}

function ComboboxInput({
  className,
  children,
  disabled = false,
  showTrigger = true,
  showClear = false,
  ...props
}: ComboboxPrimitive.Input.Props & {
  showTrigger?: boolean
  showClear?: boolean
}) {
  return (
    <InputGroup className={cn("w-auto", className)}>
      <ComboboxPrimitive.Input
        render={<InputGroupInput disabled={disabled} />}
        {...props}
      />
      <InputGroupAddon align="inline-end">
        {showTrigger && (
          <InputGroupButton
            size="icon-xs"
            variant="ghost"
            asChild
            data-slot="input-group-button"
            className="group-has-data-[slot=combobox-clear]/input-group:hidden data-pressed:bg-transparent"
            disabled={disabled}
          >
            <ComboboxTrigger />
          </InputGroupButton>
        )}
        {showClear && <ComboboxClear disabled={disabled} />}
      </InputGroupAddon>
      {children}
    </InputGroup>
  )
}

function ComboboxContent({
  className,
  side = "bottom",
  sideOffset = 6,
  align = "start",
  alignOffset = 0,
  anchor,
  ...props
}: ComboboxPrimitive.Popup.Props &
  Pick<
    ComboboxPrimitive.Positioner.Props,
    "side" | "align" | "sideOffset" | "alignOffset" | "anchor"
  >) {
  return (
    <ComboboxPrimitive.Portal>
      <ComboboxPrimitive.Positioner
        side={side}
        sideOffset={sideOffset}
        align={align}
        alignOffset={alignOffset}
        anchor={anchor}
        className="isolate z-50 pointer-events-auto"
      >
        <ComboboxPrimitive.Popup
          data-slot="combobox-content"
          data-chips={!!anchor}
          className={cn(
            "group/combobox-content relative max-h-96 w-(--anchor-width) max-w-(--available-width) min-w-[calc(var(--anchor-width)+--spacing(7))] origin-(--transform-origin) overflow-hidden rounded-md bg-popover text-popover-foreground shadow-md ring-1 ring-foreground/10 duration-100 data-[chips=true]:min-w-(--anchor-width) data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 *:data-[slot=input-group]:m-1 *:data-[slot=input-group]:mb-0 *:data-[slot=input-group]:h-8 *:data-[slot=input-group]:border-input/30 *:data-[slot=input-group]:bg-input/30 *:data-[slot=input-group]:shadow-none data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95",
            className
          )}
          {...props}
        />
      </ComboboxPrimitive.Positioner>
    </ComboboxPrimitive.Portal>
  )
}

function ComboboxList({
  className,
  ref,
  ...props
}: ComboboxPrimitive.List.Props & { ref?: React.Ref<HTMLDivElement> }) {
  const listRef = React.useRef<HTMLDivElement>(null)

  return (
    <ComboboxPrimitive.List
      ref={(node) => {
        listRef.current = node
        if (typeof ref === "function") ref(node)
        else if (ref) ref.current = node
      }}
      data-slot="combobox-list"
      onWheel={(event) => {
        // Radix Dialog's scroll lock (react-remove-scroll) always cancels
        // wheel scroll on elements outside its own lock/shards, even if
        // they're independently scrollable. Since this popup is portaled by
        // Base UI (a different library not registered with Radix), scroll
        // it manually instead of relying on the browser's default action.
        listRef.current?.scrollBy({ top: event.deltaY })
      }}
      className={cn(
        "max-h-[min(calc(--spacing(96)---spacing(9)),calc(var(--available-height)---spacing(9)))] scroll-py-1 overflow-y-auto p-1 data-empty:p-0",
        className
      )}
      {...props}
    />
  )
}

function ComboboxItem({
  className,
  children,
  ...props
}: ComboboxPrimitive.Item.Props) {
  return (
    <ComboboxPrimitive.Item
      data-slot="combobox-item"
      className={cn(
        "relative flex w-full cursor-default items-center gap-2 rounded-sm py-1.5 pr-8 pl-2 text-sm outline-hidden select-none data-highlighted:bg-accent data-highlighted:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
        className
      )}
      {...props}
    >
      {children}
      <ComboboxPrimitive.ItemIndicator
        data-slot="combobox-item-indicator"
        render={
          <span className="pointer-events-none absolute right-2 flex size-4 items-center justify-center" />
        }
      >
        <CheckIcon className="pointer-events-none size-4 pointer-coarse:size-5" />
      </ComboboxPrimitive.ItemIndicator>
    </ComboboxPrimitive.Item>
  )
}

function ComboboxGroup({ className, ...props }: ComboboxPrimitive.Group.Props) {
  return (
    <ComboboxPrimitive.Group
      data-slot="combobox-group"
      className={cn(className)}
      {...props}
    />
  )
}

function ComboboxLabel({
  className,
  ...props
}: ComboboxPrimitive.GroupLabel.Props) {
  return (
    <ComboboxPrimitive.GroupLabel
      data-slot="combobox-label"
      className={cn(
        "px-2 py-1.5 text-xs text-muted-foreground pointer-coarse:px-3 pointer-coarse:py-2 pointer-coarse:text-sm",
        className
      )}
      {...props}
    />
  )
}

function ComboboxCollection({ ...props }: ComboboxPrimitive.Collection.Props) {
  return (
    <ComboboxPrimitive.Collection data-slot="combobox-collection" {...props} />
  )
}

function ComboboxEmpty({ className, ...props }: ComboboxPrimitive.Empty.Props) {
  return (
    <ComboboxPrimitive.Empty
      data-slot="combobox-empty"
      className={cn(
        "hidden w-full justify-center py-2 text-center text-sm text-muted-foreground group-data-empty/combobox-content:flex",
        className
      )}
      {...props}
    />
  )
}

function ComboboxSeparator({
  className,
  ...props
}: ComboboxPrimitive.Separator.Props) {
  return (
    <ComboboxPrimitive.Separator
      data-slot="combobox-separator"
      className={cn("-mx-1 my-1 h-px bg-border", className)}
      {...props}
    />
  )
}

function ComboboxChips({
  className,
  ...props
}: React.ComponentPropsWithRef<typeof ComboboxPrimitive.Chips> &
  ComboboxPrimitive.Chips.Props) {
  return (
    <ComboboxPrimitive.Chips
      data-slot="combobox-chips"
      className={cn(
        "flex min-h-9 flex-wrap items-center gap-1.5 rounded-md border border-input bg-transparent bg-clip-padding px-2.5 py-1.5 text-sm shadow-xs transition-[color,box-shadow] focus-within:border-ring focus-within:ring-[3px] focus-within:ring-ring/50 has-aria-invalid:border-destructive has-aria-invalid:ring-[3px] has-aria-invalid:ring-destructive/20 has-data-[slot=combobox-chip]:px-1.5 dark:bg-input/30 dark:has-aria-invalid:border-destructive/50 dark:has-aria-invalid:ring-destructive/40",
        className
      )}
      {...props}
    />
  )
}

function ComboboxChip({
  className,
  children,
  showRemove = true,
  ...props
}: ComboboxPrimitive.Chip.Props & {
  showRemove?: boolean
}) {
  return (
    <ComboboxPrimitive.Chip
      data-slot="combobox-chip"
      className={cn(
        "flex h-[calc(--spacing(5.5))] w-fit items-center justify-center gap-1 rounded-sm bg-muted px-1.5 text-xs font-medium whitespace-nowrap text-foreground has-disabled:pointer-events-none has-disabled:cursor-not-allowed has-disabled:opacity-50 has-data-[slot=combobox-chip-remove]:pr-0",
        className
      )}
      {...props}
    >
      {children}
      {showRemove && (
        <ComboboxPrimitive.ChipRemove
          render={<Button variant="ghost" size="icon-xs" />}
          className="-ml-1 opacity-50 hover:opacity-100"
          data-slot="combobox-chip-remove"
        >
          <XIcon className="pointer-events-none" />
        </ComboboxPrimitive.ChipRemove>
      )}
    </ComboboxPrimitive.Chip>
  )
}

function ComboboxChipsInput({
  className,
  children,
  ...props
}: ComboboxPrimitive.Input.Props) {
  return (
    <ComboboxPrimitive.Input
      data-slot="combobox-chip-input"
      className={cn("min-w-16 flex-1 outline-none", className)}
      {...props}
    />
  )
}

function useComboboxAnchor() {
  return React.useRef<HTMLDivElement | null>(null)
}

export {
  Combobox,
  ComboboxInput,
  ComboboxContent,
  ComboboxList,
  ComboboxItem,
  ComboboxGroup,
  ComboboxLabel,
  ComboboxCollection,
  ComboboxEmpty,
  ComboboxSeparator,
  ComboboxChips,
  ComboboxChip,
  ComboboxChipsInput,
  ComboboxTrigger,
  ComboboxValue,
  useComboboxAnchor,
}