import * as React from "react"
import { Slot } from "@radix-ui/react-slot"
import { cva, type VariantProps } from "class-variance-authority"
import { cn } from "../../lib/utils"


const buttonVariants = cva(
  "inline-flex items-center justify-center gap-[7px] whitespace-nowrap rounded-md text-sm font-medium transition-all disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
  {
    variants: {
      variant: {
        default: "bg-primary text-primary-foreground hover:bg-primary/90",
        primary: "bg-primary text-primary-foreground hover:bg-primary/90",
        destructive:
          "bg-destructive text-white hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/60",
        outline:
          "border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:border-input dark:hover:bg-input/50",
        secondary:
          "bg-secondary text-secondary-foreground hover:bg-secondary/80",
        ghost:
          "hover:bg-accent hover:text-accent-foreground dark:hover:bg-accent/50",
        link: "text-primary underline-offset-4 hover:underline",
      },
      size: {
        default: "h-[30px] px-3 has-[>svg]:px-3",
        sm: "h-[26px] rounded-md gap-1.5 px-[9px] has-[>svg]:px-2",
        lg: "h-10 rounded-md px-6 has-[>svg]:px-4",
        icon: "size-9",
        "icon-sm": "size-8",
        "icon-lg": "size-10",
      },
    },
    defaultVariants: {
      variant: "default",
      size: "default",
    },
  }
)

// A variant with a shared button recipe draws that recipe; ghost, link and the icon sizes keep their own.
// A caller that already names a btn class has chosen its recipe, so it is left exactly as it was.
const BUTTON_RECIPE: Partial<Record<string, readonly [string, string]>> = {
  default: ["btn btn-blue", "btn btn-blue-sm"],
  primary: ["btn btn-blue", "btn btn-blue-sm"],
  destructive: ["btn btn-red", "btn btn-red-sm"],
  outline: ["btn btn-blue-ghost", "btn btn-blue-ghost-sm"],
  secondary: ["btn btn-blue-ghost", "btn btn-blue-ghost-sm"],
}

const BUTTON_FRAME = "shrink-0 whitespace-nowrap transition-all [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4"

function buttonClass(variant: string, size: string, className?: string): string {
  const recipe = size === "default" || size === "sm" ? BUTTON_RECIPE[variant] : undefined
  if (!recipe || /(^|\s)btn(\s|$)/.test(className ?? "")) {
    return cn(buttonVariants({ variant: variant as VariantProps<typeof buttonVariants>["variant"], size: size as VariantProps<typeof buttonVariants>["size"], className }))
  }
  return cn(recipe[size === "sm" ? 1 : 0], BUTTON_FRAME, className)
}

function Button({
  className,
  variant = "default",
  size = "default",
  asChild = false,
  type,
  ...props
}: React.ComponentProps<"button"> &
  VariantProps<typeof buttonVariants> & {
    asChild?: boolean
  }) {
  const Comp = asChild ? Slot : "button"

  // A <button> with no type is type="submit" per HTML, so every Button inside a form was submitting it
  // as a side effect of being clicked - the handler ran AND the form submitted. That is invisible on a
  // screen with no form and silently destructive on one with a form, which is the worst combination to
  // leave to each call site to remember.
  //
  // MEASURED BEFORE CHANGING IT, because this is a 372-call-site primitive. 112 sites already pass a
  // type by hand - 103 of them "button", which is the same fix applied one file at a time and is the
  // evidence that the default is the thing that is wrong. Exactly ZERO sites relied on the implicit
  // submit, so nothing that worked stops working; the nine explicit type="submit" callers are untouched
  // and still submit.
  //
  // asChild renders somebody else's element, frequently an <a>, where `type` means something different
  // or nothing at all - so the default is applied only when this really is a <button>, and an explicit
  // type is still forwarded either way.
  const typeProp = asChild
    ? (type === undefined ? {} : { type })
    : { type: type ?? "button" }

  return (
    <Comp
      data-slot="button"
      data-variant={variant}
      data-size={size}
      className={buttonClass(variant ?? "default", size ?? "default", className)}
      {...typeProp}
      {...props}
    />
  )
}

export { Button, buttonVariants }