import * as React from "react"
import { cva, type VariantProps } from "class-variance-authority"
import { Slot } from "radix-ui"

import { cn } from "../../lib/utils"
import { Button } from "./button"

const attachmentVariants = cva(
  "group/attachment relative flex w-fit max-w-full min-w-0 shrink-0 flex-wrap rounded-xl border border-border bg-card text-card-foreground transition-colors focus-within:ring-1 focus-within:ring-ring/50 has-[>a,>button]:hover:bg-muted/50 data-[state=error]:border-destructive/30 data-[state=idle]:border-dashed",
  {
    variants: {
      size: {
        default:
          "gap-2 text-sm has-data-[slot=attachment-content]:px-2.5 has-data-[slot=attachment-content]:py-2 has-data-[slot=attachment-media]:p-2",
        sm: "gap-2.5 text-xs has-data-[slot=attachment-content]:px-2 has-data-[slot=attachment-content]:py-1.5 has-data-[slot=attachment-media]:p-1.5",
        xs: "gap-1.5 rounded-lg text-xs has-data-[slot=attachment-content]:px-1.5 has-data-[slot=attachment-content]:py-1 has-data-[slot=attachment-media]:p-1",
      },
      orientation: {
        horizontal: "min-w-40 items-center",
        // Match shadcn image cards — full media fills a ~9rem chip (not the sm 32px icon slot).
        vertical: "w-36 flex-col has-data-[slot=attachment-content]:w-36",
      },
    },
  },
)

export type AttachmentState =
  | "idle"
  | "uploading"
  | "processing"
  | "error"
  | "done"

function Attachment({
  className,
  state = "done",
  size = "default",
  orientation = "horizontal",
  ...props
}: React.ComponentProps<"div"> &
  VariantProps<typeof attachmentVariants> & {
    state?: AttachmentState
  }) {
  return (
    <div
      data-slot="attachment"
      data-state={state}
      data-size={size}
      data-orientation={orientation}
      className={cn(attachmentVariants({ size, orientation }), className)}
      {...props}
    />
  )
}

const attachmentMediaVariants = cva(
  [
    "relative flex aspect-square w-10 shrink-0 items-center justify-center overflow-hidden rounded-lg bg-muted text-foreground",
    // Vertical media fills the card. Size scale only shrinks horizontal icon chips —
    // otherwise `size=sm` overrides `w-full` and image thumbs collapse to 32px.
    "group-data-[orientation=vertical]/attachment:w-full",
    "group-data-[orientation=horizontal]/attachment:group-data-[size=sm]/attachment:w-8",
    "group-data-[orientation=horizontal]/attachment:group-data-[size=xs]/attachment:w-7",
    "group-data-[size=xs]/attachment:rounded-md",
    "group-data-[state=error]/attachment:bg-destructive/10 group-data-[state=error]/attachment:text-destructive-ink",
    "[&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4",
    "group-data-[orientation=vertical]/attachment:[&_svg:not([class*='size-'])]:size-6",
    "group-data-[size=xs]/attachment:[&_svg:not([class*='size-'])]:size-3.5",
    "[&_i]:pointer-events-none [&_i]:leading-none [&_i]:text-base",
    "group-data-[orientation=vertical]/attachment:[&_i]:text-xl",
    "group-data-[size=xs]/attachment:[&_i]:text-sm",
  ].join(" "),
  {
    variants: {
      variant: {
        icon: "",
        image:
          "opacity-60 group-data-[state=done]/attachment:opacity-100 group-data-[state=idle]/attachment:opacity-100 *:[img]:aspect-square *:[img]:size-full *:[img]:object-cover",
      },
    },
    defaultVariants: {
      variant: "icon",
    },
  },
)

function AttachmentMedia({
  className,
  variant = "icon",
  ...props
}: React.ComponentProps<"div"> & VariantProps<typeof attachmentMediaVariants>) {
  return (
    <div
      data-slot="attachment-media"
      data-variant={variant}
      className={cn(attachmentMediaVariants({ variant }), className)}
      {...props}
    />
  )
}

function AttachmentContent({
  className,
  ...props
}: React.ComponentProps<"div">) {
  return (
    <div
      data-slot="attachment-content"
      className={cn(
        "max-w-full min-w-0 flex-1 leading-tight group-data-[orientation=vertical]/attachment:px-1",
        className,
      )}
      {...props}
    />
  )
}

function AttachmentTitle({
  className,
  ...props
}: React.ComponentProps<"span">) {
  return (
    <span
      data-slot="attachment-title"
      className={cn(
        // Shimmer is a custom CSS class (not a Tailwind utility), so variants like
        // `group-data-[state=uploading]:shimmer` never compile — drive it via parent
        // `data-state` in globals instead (see `.attachment-title-shimmer`).
        "attachment-title-shimmer block max-w-full min-w-0 truncate font-medium",
        className,
      )}
      {...props}
    />
  )
}

function AttachmentDescription({
  className,
  ...props
}: React.ComponentProps<"span">) {
  return (
    <span
      data-slot="attachment-description"
      className={cn(
        "mt-0.5 block max-w-full min-w-0 truncate text-xs text-muted-foreground group-data-[state=error]/attachment:text-destructive-ink/80",
        className,
      )}
      {...props}
    />
  )
}

function AttachmentActions({
  className,
  ...props
}: React.ComponentProps<"div">) {
  return (
    <div
      data-slot="attachment-actions"
      className={cn(
        "relative z-20 flex shrink-0 items-center group-data-[orientation=vertical]/attachment:absolute group-data-[orientation=vertical]/attachment:top-3 group-data-[orientation=vertical]/attachment:right-3 group-data-[orientation=vertical]/attachment:gap-1",
        className,
      )}
      {...props}
    />
  )
}

function AttachmentAction({
  className,
  variant,
  size = "icon-xs",
  ...props
}: React.ComponentProps<typeof Button>) {
  return (
    <Button
      data-slot="attachment-action"
      variant={variant ?? "ghost"}
      size={size}
      className={cn(className)}
      {...props}
    />
  )
}

function AttachmentTrigger({
  className,
  asChild = false,
  type,
  ...props
}: React.ComponentProps<"button"> & {
  asChild?: boolean
}) {
  const Comp = asChild ? Slot.Root : "button"

  return (
    <Comp
      data-slot="attachment-trigger"
      type={asChild ? undefined : (type ?? "button")}
      className={cn("absolute inset-0 z-10 outline-none", className)}
      {...props}
    />
  )
}

function AttachmentGroup({ className, ...props }: React.ComponentProps<"div">) {
  return (
    <div
      data-slot="attachment-group"
      className={cn(
        "flex min-w-0 snap-x snap-mandatory scroll-px-1 gap-3 overflow-x-auto overscroll-x-contain py-1 [scrollbar-width:none] [-ms-overflow-style:none] [&::-webkit-scrollbar]:hidden",
        "[mask-image:linear-gradient(to_right,transparent_0%,black_1.25rem,black_calc(100%-1.25rem),transparent_100%)] [-webkit-mask-image:linear-gradient(to_right,transparent_0%,black_1.25rem,black_calc(100%-1.25rem),transparent_100%)]",
        "*:data-[slot=attachment]:flex-none *:data-[slot=attachment]:snap-start",
        className,
      )}
      {...props}
    />
  )
}

export {
  Attachment,
  AttachmentGroup,
  AttachmentMedia,
  AttachmentContent,
  AttachmentTitle,
  AttachmentDescription,
  AttachmentActions,
  AttachmentAction,
  AttachmentTrigger,
  attachmentVariants,
}