Stepper with truck route and rest stops

"use client"

import { useEffect, useRef, useState, type ReactNode } from "react"
import { Badge } from "@/components/reui/badge"
import { IconTile } from "@/components/reui/icon-tile"
import {
  Stepper,
  StepperContent,
  StepperIndicator,
  StepperItem,
  StepperNav,
  StepperPanel,
  StepperSeparator,
  StepperTrigger,
} from "@/components/reui/stepper"
import { cn } from "cn"

import { Button } from "@/components/ui/button"
import { IconPlaceholder } from "@/app/(create)/components/icon-placeholder"

interface Stop {
  title: string
  place: string
  km: string
  note: string
  icon: ReactNode
  rest?: string
}

const moon = (
  <IconPlaceholder
    lucide="MoonIcon"
    tabler="IconMoon"
    hugeicons="Moon02Icon"
    phosphor="MoonIcon"
    remixicon="RiMoonLine"
  />
)

const sun = (
  <IconPlaceholder
    lucide="SunIcon"
    tabler="IconSun"
    hugeicons="Sun01Icon"
    phosphor="SunIcon"
    remixicon="RiSunLine"
  />
)

const stops: Stop[] = [
  {
    title: "Pickup",
    place: "Memphis, TN",
    km: "0",
    note: "24 pallets loaded and sealed, westbound on I-40.",
    icon: (
      <IconPlaceholder
        lucide="PackagePlusIcon"
        tabler="IconPackageImport"
        hugeicons="PackageAddIcon"
        phosphor="PackageIcon"
        remixicon="RiBox3Line"
      />
    ),
  },
  {
    title: "Overnight rest",
    place: "Amarillo, TX",
    km: "1,155",
    note: "8 hours in the sleeper berth before the next shift.",
    icon: moon,
    rest: "8H",
  },
  {
    title: "Back on the road",
    place: "Amarillo, TX",
    km: "1,155",
    note: "A fresh 11-hour driving window, 1,735 km to go.",
    icon: sun,
  },
  {
    title: "Fuel stop",
    place: "Gallup, NM",
    km: "1,840",
    note: "Refueled with 410 L of diesel and checked the tires.",
    icon: (
      <IconPlaceholder
        lucide="FuelIcon"
        tabler="IconGasStation"
        hugeicons="FuelStationIcon"
        phosphor="GasPumpIcon"
        remixicon="RiGasStationLine"
      />
    ),
  },
  {
    title: "Overnight rest",
    place: "Kingman, AZ",
    km: "2,375",
    note: "8 hours in the sleeper berth, 515 km from delivery.",
    icon: moon,
    rest: "8H",
  },
  {
    title: "Back on the road",
    place: "Kingman, AZ",
    km: "2,375",
    note: "On I-40 to Barstow, then I-15 into Los Angeles.",
    icon: sun,
  },
  {
    title: "Delivery",
    place: "Los Angeles, CA",
    km: "2,890",
    note: "Signed for at dock 4 by the receiving clerk.",
    icon: (
      <IconPlaceholder
        lucide="FlagIcon"
        tabler="IconFlag"
        hugeicons="Flag03Icon"
        phosphor="FlagIcon"
        remixicon="RiFlagLine"
      />
    ),
  },
]

// A gradient cut into 2x6px pill bars by a 6px SVG mask tile, spaced edge to
// edge by mask-repeat: space so no bar is ever clipped. The -2px margins land
// the first and last bar flush with the 4px margins around the leg.
function Leg({ rest, live }: { rest?: string; live: boolean }) {
  return (
    <div className="relative mx-1 flex min-w-3 flex-1 items-center self-stretch">
      <StepperSeparator className="from-input/80 to-input/80 data-[state=active]:from-success/24 data-[state=active]:to-success/80 -mx-0.5 bg-transparent bg-linear-to-r mask-[url('data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220,0,6,6%22%3E%3Crect%20x=%222%22%20width=%222%22%20height=%226%22%20rx=%221%22/%3E%3C/svg%3E')] mask-size-[0.375rem_100%] mask-repeat-space group-data-[orientation=horizontal]/stepper-nav:h-1.5 rtl:bg-linear-to-l" />

      {rest && (
        <Badge
          variant="invert"
          className="pointer-events-none absolute inset-0 m-auto @max-xl:hidden"
          aria-hidden="true"
        >
          {rest}
        </Badge>
      )}

      {/* 6px above the ticks as in Figma. Over a rest leg it rides 4px
          higher so it clears the 8H badge by 3px instead of touching it. */}
      {live && (
        <Badge
          variant="success"
          className={cn(
            "pointer-events-none absolute inset-x-0 mx-auto",
            rest ? "-top-4.5" : "-top-3.5"
          )}
          aria-hidden="true"
        >
          <IconPlaceholder
            lucide="TruckIcon"
            tabler="IconTruck"
            hugeicons="TruckIcon"
            phosphor="TruckIcon"
            remixicon="RiTruckLine"
            className="rtl:-scale-x-100"
          />
        </Badge>
      )}
    </div>
  )
}

export function Pattern() {
  const [current, setCurrent] = useState(6)
  const prevRef = useRef<HTMLButtonElement>(null)
  const nextRef = useRef<HTMLButtonElement>(null)
  // One past the last step marks every step complete. No tab is selected
  // then, so the last one keeps the tablist's tab stop.
  const allDone = current > stops.length

  // Past the collapsed width (many steps in a small box) the row scrolls, so
  // the current step comes back into view when it changes or the row resizes,
  // and a tab comes into view when focus lands on it (the browser leaves a
  // half-hidden one where it is). Only the row scrolls, never the page.
  const rowRef = useRef<HTMLDivElement>(null)
  useEffect(() => {
    const row = rowRef.current
    if (!row) return
    const reveal = (tab: Element | null) => {
      if (!tab) return
      const box = row.getBoundingClientRect()
      const { left, right } = tab.getBoundingClientRect()
      if (left < box.left || right > box.right) {
        row.scrollLeft += (left + right - box.left - box.right) / 2
      }
    }
    const onFocus = (event: FocusEvent) =>
      reveal((event.target as Element).closest('[role="tab"]'))
    const observer = new ResizeObserver(() =>
      reveal(row.querySelector('[aria-selected="true"]'))
    )
    observer.observe(row)
    row.addEventListener("focusin", onFocus)
    return () => {
      observer.disconnect()
      row.removeEventListener("focusin", onFocus)
    }
  }, [current])

  function goTo(step: number) {
    setCurrent(step)
    // The pressed button disables itself at either end, so focus moves to its partner.
    if (step === 1) nextRef.current?.focus()
    if (step > stops.length) prevRef.current?.focus()
  }

  return (
    <Stepper
      value={current}
      onValueChange={setCurrent}
      className="w-full max-w-200"
      aria-label="Freight route"
    >
      {/* Under 36rem the rest stops give up their fixed width and 8H badge
          and every leg shrinks to 12px; past that the route scrolls instead of
          crushing them. The top padding is the room the truck badge rides in
          at its highest (over a rest leg); the rest keeps the focus ring
          inside the scroll box. */}
      <div
        ref={rowRef}
        className="@container relative -mx-1 overflow-x-auto px-1 pt-4.5 pb-1"
      >
        <StepperNav className="min-w-max">
          {stops.map((stop, index) => {
            const step = index + 1
            const last = step === stops.length
            const active = step === current

            // Each stop owns the leg that follows it, so the active stop's
            // leg is the live one. Rest stops keep a fixed 32px leg.
            return (
              <StepperItem
                key={`${stop.title} ${stop.place}`}
                step={step}
                className={cn(stop.rest && "@xl:w-17.5 @xl:not-last:flex-none")}
              >
                <StepperTrigger
                  tabIndex={allDone && step === stops.length ? 0 : undefined}
                  aria-label={`${stop.title}, ${stop.place}`}
                >
                  {/* The 30px ring stays transparent and the 24px tile inside
                      it carries the icon. With no leg left to light up, the
                      destination itself turns green once it is reached. */}
                  <StepperIndicator className="border-input/50 size-7.5 border bg-transparent data-[state=active]:bg-transparent data-[state=completed]:bg-transparent">
                    <IconTile
                      variant="solid"
                      size="xs"
                      radius="full"
                      className={cn(
                        "bg-input text-foreground [--icon-tile-icon-size:--spacing(3)]",
                        last && step <= current && "bg-success text-white"
                      )}
                      aria-hidden="true"
                    >
                      {stop.icon}
                    </IconTile>
                  </StepperIndicator>
                </StepperTrigger>

                {!last && <Leg rest={stop.rest} live={active} />}
              </StepperItem>
            )
          })}
        </StepperNav>
      </div>

      <StepperPanel className="mt-5 text-center">
        {stops.map((stop, index) => (
          <StepperContent key={`${stop.title} ${stop.place}`} value={index + 1}>
            <p className="text-muted-foreground flex items-center justify-center gap-1.5 text-xs whitespace-nowrap">
              {stop.place}
              <span
                aria-hidden="true"
                className="bg-muted-foreground/40 size-1 shrink-0 rounded-full"
              />
              km {stop.km}
            </p>
            <p className="text-sm font-medium">{stop.title}</p>
            <p className="text-muted-foreground text-sm">{stop.note}</p>
          </StepperContent>
        ))}
        <StepperContent value={stops.length + 1}>
          <p className="text-muted-foreground text-xs">
            All {stops.length} stops done
          </p>
          <p className="text-sm font-medium">Trip complete</p>
          <p className="text-muted-foreground text-sm">
            The load is signed for and the trip is closed.
          </p>
        </StepperContent>
        <div className="mt-3 flex justify-center gap-2">
          <Button
            ref={prevRef}
            variant="outline"
            size="sm"
            disabled={current === 1}
            onClick={() => goTo(current - 1)}
          >
            Previous
          </Button>
          <Button
            ref={nextRef}
            variant="outline"
            size="sm"
            disabled={allDone}
            onClick={() => goTo(current + 1)}
          >
            Next
          </Button>
        </div>
      </StepperPanel>
    </Stepper>
  )
}