import { Slot } from '@radix-ui/react-slot'
import { PanelLeftIcon } from 'lucide-react'
import * as React from 'react'

import { cn } from 'shared/lib/utils'
import { Button } from 'shared/ui/button'
import { Input } from 'shared/ui/input'
import { Separator } from 'shared/ui/separator'

const SIDEBAR_COOKIE_NAME = 'sidebar_state'
const SIDEBAR_COOKIE_MAX_AGE = 60 * 60 * 24 * 7
const SIDEBAR_WIDTH = '16rem'
const SIDEBAR_WIDTH_MOBILE = '18rem'
const SIDEBAR_WIDTH_ICON = '3rem'
const SIDEBAR_KEYBOARD_SHORTCUT = 'b'

type SidebarContextProps = {
  state: 'expanded' | 'collapsed'
  open: boolean
  setOpen: (open: boolean) => void
  openMobile: boolean
  setOpenMobile: (open: boolean) => void
  isMobile: boolean
  toggleSidebar: () => void
}

const SidebarContext = React.createContext<SidebarContextProps | null>(null)

function useSidebar() {
  const context = React.useContext(SidebarContext)
  if (!context) {
    throw new Error('useSidebar must be used within a SidebarProvider.')
  }

  return context
}

// Simple mobile hook implementation
function useIsMobile() {
  const [isMobile, setIsMobile] = React.useState(false)

  React.useEffect(() => {
    const checkMobile = () => {
      setIsMobile(window.innerWidth < 768)
    }

    checkMobile()
    window.addEventListener('resize', checkMobile)
    return () => window.removeEventListener('resize', checkMobile)
  }, [])

  return isMobile
}

function SidebarProvider({
  defaultOpen = true,
  open: openProp,
  onOpenChange: setOpenProp,
  className,
  style,
  children,
  ...props
}: React.ComponentProps<'div'> & {
  defaultOpen?: boolean
  open?: boolean
  onOpenChange?: (open: boolean) => void
}) {
  const isMobile = useIsMobile()
  const [openMobile, setOpenMobile] = React.useState(false)

  // This is the internal state of the sidebar.
  // We use openProp and setOpenProp for control from outside the component.
  const [_open, _setOpen] = React.useState(defaultOpen)
  const open = openProp ?? _open
  const setOpen = React.useCallback(
    (value: boolean | ((value: boolean) => boolean)) => {
      const openState = typeof value === 'function' ? value(open) : value
      if (setOpenProp) {
        setOpenProp(openState)
      } else {
        _setOpen(openState)
      }

      // This sets the cookie to keep the sidebar state.
      document.cookie = `${SIDEBAR_COOKIE_NAME}=${openState}; path=/; max-age=${SIDEBAR_COOKIE_MAX_AGE}`
    },
    [setOpenProp, open]
  )

  // Helper to toggle the sidebar.
  const toggleSidebar = React.useCallback(() => {
    return isMobile ? setOpenMobile(open => !open) : setOpen(open => !open)
  }, [isMobile, setOpen, setOpenMobile])

  // Adds a keyboard shortcut to toggle the sidebar.
  React.useEffect(() => {
    const handleKeyDown = (event: KeyboardEvent) => {
      if (
        event.key === SIDEBAR_KEYBOARD_SHORTCUT &&
        (event.metaKey || event.ctrlKey)
      ) {
        event.preventDefault()
        toggleSidebar()
      }
    }

    window.addEventListener('keydown', handleKeyDown)
    return () => window.removeEventListener('keydown', handleKeyDown)
  }, [toggleSidebar])

  // We add a state so that we can do data-state="expanded" or "collapsed".
  // This makes it easier to style the sidebar with Tailwind classes.
  const state = open ? 'expanded' : 'collapsed'

  const contextValue = React.useMemo<SidebarContextProps>(
    () => ({
      state,
      open,
      setOpen,
      isMobile,
      openMobile,
      setOpenMobile,
      toggleSidebar,
    }),
    [state, open, setOpen, isMobile, openMobile, setOpenMobile, toggleSidebar]
  )

  return (
    <SidebarContext.Provider value={contextValue}>
      <div
        data-slot="sidebar-wrapper"
        style={
          {
            '--sidebar-width': SIDEBAR_WIDTH,
            '--sidebar-width-icon': SIDEBAR_WIDTH_ICON,
            ...style,
          } as React.CSSProperties
        }
        className={cn(
          'group/sidebar-wrapper has-data-[variant=inset]:bg-sidebar flex min-h-svh w-full',
          className
        )}
        {...props}
      >
        {children}
      </div>
    </SidebarContext.Provider>
  )
}

function Sidebar({
  side = 'left',
  variant = 'sidebar',
  collapsible = 'offcanvas',
  className,
  children,
  ...props
}: React.ComponentProps<'div'> & {
  side?: 'left' | 'right'
  variant?: 'sidebar' | 'floating' | 'inset'
  collapsible?: 'offcanvas' | 'icon' | 'none'
}) {
  const { isMobile, state, openMobile, setOpenMobile } = useSidebar()

  if (collapsible === 'none') {
    return (
      <div
        data-slot="sidebar"
        className={cn(
          'bg-sidebar text-sidebar-foreground flex h-full w-[--sidebar-width] flex-col',
          className
        )}
        {...props}
      >
        {children}
      </div>
    )
  }

  if (isMobile) {
    return (
      <div
        className="fixed inset-0 z-50 bg-black/50"
        onClick={() => setOpenMobile(false)}
      >
        <div
          className={cn(
            'fixed inset-y-0 left-0 w-[--sidebar-width] bg-background p-4 text-foreground shadow-lg transition-transform duration-300',
            openMobile ? 'translate-x-0' : '-translate-x-full'
          )}
          style={
            {
              '--sidebar-width': SIDEBAR_WIDTH_MOBILE,
            } as React.CSSProperties
          }
          onClick={e => e.stopPropagation()}
        >
          <div className="flex h-full w-full flex-col">{children}</div>
        </div>
      </div>
    )
  }

  return (
    <div
      className="text-sidebar-foreground group peer hidden md:block"
      data-state={state}
      data-collapsible={state === 'collapsed' ? collapsible : ''}
      data-variant={variant}
      data-side={side}
      data-slot="sidebar"
    >
      {/* This is what handles the sidebar gap on desktop */}
      <div
        data-slot="sidebar-gap"
        className={cn(
          'relative w-[--sidebar-width] bg-transparent transition-[width] duration-200 ease-linear',
          'group-data-[collapsible=offcanvas]:w-0',
          'group-data-[side=right]:rotate-180',
          variant === 'floating' || variant === 'inset'
            ? 'group-data-[collapsible=icon]:w-[calc(var(--sidebar-width-icon)+1rem)]'
            : 'group-data-[collapsible=icon]:w-[--sidebar-width-icon]'
        )}
      />
      <div
        data-slot="sidebar-container"
        className={cn(
          'fixed inset-y-0 z-10 hidden h-svh w-[--sidebar-width] transition-[left,right,width] duration-200 ease-linear md:flex',
          side === 'left'
            ? 'left-0 group-data-[collapsible=offcanvas]:left-[calc(var(--sidebar-width)*-1)]'
            : 'right-0 group-data-[collapsible=offcanvas]:right-[calc(var(--sidebar-width)*-1)]',
          // Adjust the padding for floating and inset variants.
          variant === 'floating' || variant === 'inset'
            ? 'p-2 group-data-[collapsible=icon]:w-[calc(var(--sidebar-width-icon)+1rem+2px)]'
            : 'group-data-[collapsible=icon]:w-[--sidebar-width-icon] group-data-[side=left]:border-r group-data-[side=right]:border-l',
          className
        )}
        {...props}
      >
        <div
          data-sidebar="sidebar"
          data-slot="sidebar-inner"
          className="flex h-full w-full flex-col border-r bg-background group-data-[variant=floating]:rounded-lg group-data-[variant=floating]:border group-data-[variant=floating]:shadow-sm"
        >
          {children}
        </div>
      </div>
    </div>
  )
}

function SidebarTrigger({
  className,
  onClick,
  ...props
}: React.ComponentProps<typeof Button>) {
  const { toggleSidebar } = useSidebar()

  return (
    <Button
      data-sidebar="trigger"
      data-slot="sidebar-trigger"
      variant="ghost"
      size="icon"
      className={cn('size-7', className)}
      onClick={event => {
        onClick?.(event)
        toggleSidebar()
      }}
      {...props}
    >
      <PanelLeftIcon />
      <span className="sr-only">Toggle Sidebar</span>
    </Button>
  )
}

function SidebarInset({ className, ...props }: React.ComponentProps<'main'>) {
  return (
    <main
      data-slot="sidebar-inset"
      className={cn(
        'relative flex w-full flex-1 flex-col bg-background',
        'md:peer-data-[variant=inset]:m-2 md:peer-data-[variant=inset]:ml-0 md:peer-data-[variant=inset]:peer-data-[state=collapsed]:ml-2 md:peer-data-[variant=inset]:rounded-xl md:peer-data-[variant=inset]:shadow-sm',
        className
      )}
      {...props}
    />
  )
}

function SidebarInput({
  className,
  ...props
}: React.ComponentProps<typeof Input>) {
  return (
    <Input
      data-slot="sidebar-input"
      data-sidebar="input"
      className={cn('h-8 w-full bg-background shadow-none', className)}
      {...props}
    />
  )
}

function SidebarHeader({ className, ...props }: React.ComponentProps<'div'>) {
  return (
    <div
      data-slot="sidebar-header"
      data-sidebar="header"
      className={cn('flex flex-col gap-2 p-2', className)}
      {...props}
    />
  )
}

function SidebarFooter({ className, ...props }: React.ComponentProps<'div'>) {
  return (
    <div
      data-slot="sidebar-footer"
      data-sidebar="footer"
      className={cn('flex flex-col gap-2 p-2', className)}
      {...props}
    />
  )
}

function SidebarSeparator({
  className,
  ...props
}: React.ComponentProps<typeof Separator>) {
  return (
    <Separator
      data-slot="sidebar-separator"
      data-sidebar="separator"
      className={cn('mx-2 w-auto bg-border', className)}
      {...props}
    />
  )
}

function SidebarContent({ className, ...props }: React.ComponentProps<'div'>) {
  return (
    <div
      data-slot="sidebar-content"
      data-sidebar="content"
      className={cn(
        'flex min-h-0 flex-1 flex-col gap-2 overflow-auto group-data-[collapsible=icon]:overflow-hidden',
        className
      )}
      {...props}
    />
  )
}

function SidebarGroup({ className, ...props }: React.ComponentProps<'div'>) {
  return (
    <div
      data-slot="sidebar-group"
      data-sidebar="group"
      className={cn('relative flex w-full min-w-0 flex-col p-2', className)}
      {...props}
    />
  )
}

function SidebarGroupLabel({
  className,
  asChild = false,
  ...props
}: React.ComponentProps<'div'> & { asChild?: boolean }) {
  const Comp = asChild ? Slot : 'div'

  return (
    <Comp
      data-slot="sidebar-group-label"
      data-sidebar="group-label"
      className={cn(
        'outline-hidden flex h-8 shrink-0 items-center rounded-md px-2 text-xs font-medium text-foreground/70 ring-ring transition-[margin,opacity] duration-200 ease-linear focus-visible:ring-2 [&>svg]:size-4 [&>svg]:shrink-0',
        'group-data-[collapsible=icon]:-mt-8 group-data-[collapsible=icon]:opacity-0',
        className
      )}
      {...props}
    />
  )
}

function SidebarGroupContent({
  className,
  ...props
}: React.ComponentProps<'div'>) {
  return (
    <div
      data-slot="sidebar-group-content"
      data-sidebar="group-content"
      className={cn('w-full text-sm', className)}
      {...props}
    />
  )
}

export {
  Sidebar,
  SidebarContent,
  SidebarFooter,
  SidebarGroup,
  SidebarGroupContent,
  SidebarGroupLabel,
  SidebarHeader,
  SidebarInput,
  SidebarInset,
  SidebarProvider,
  SidebarSeparator,
  SidebarTrigger,
  useSidebar,
}