Stepper

import type { ReactNode } from "react";

const states = {
  done: { mark: "border-(--tui-stepper-done-bg) bg-(--tui-stepper-done-bg) text-(--tui-stepper-done-fg)", label: "text-(--tui-stepper-fg)", line: "bg-(--tui-stepper-done-bg)" },
  current: { mark: "border-(--tui-stepper-current-border) bg-(--tui-stepper-bg) text-(--tui-stepper-fg)", label: "font-(--tui-stepper-current-weight) text-(--tui-stepper-fg)", line: "bg-(--tui-stepper-line)" },
  upcoming: { mark: "border-(--tui-stepper-line) bg-(--tui-stepper-bg) text-(--tui-stepper-muted)", label: "text-(--tui-stepper-muted)", line: "bg-(--tui-stepper-line)" },
};

export interface StepperProps {
  /** The steps, in order. */
  steps: ReactNode[];
  /** Which step is in progress, starting at 0. Everything before it is done. */
  current: number;
  label?: string;
  className?: string;
}

export function Stepper({ steps, current, label = "Progress", className }: StepperProps) {
  return (
    <ol aria-label={label} className={["m-0 flex w-full list-none items-start p-0 font-(family-name:--tui-font) text-(length:--tui-stepper-font-size)", className].filter(Boolean).join(" ")}>
      {steps.map((step, i) => {
        const state = i < current ? "done" : i === current ? "current" : "upcoming";
        const s = states[state];
        return (
          <li key={i} aria-current={state === "current" ? "step" : undefined} className="flex min-w-0 flex-1 flex-col items-center gap-(--tui-stepper-gap) last:flex-none">
            <div className="flex w-full items-center">
              <span data-slot="step" data-state={state} className={`flex size-(--tui-stepper-size) shrink-0 items-center justify-center rounded-(--tui-stepper-radius) border-solid border-(length:--tui-stepper-border-width) leading-none font-medium tabular-nums ${s.mark}`}>
                {state === "done" ? (
                  <svg aria-hidden viewBox="0 0 16 16" fill="none" stroke="currentColor" strokeWidth="2.25" strokeLinecap="round" strokeLinejoin="round" className="size-[55%]">
                    <path d="M3.5 8.5l3 3 6-7" />
                  </svg>
                ) : (
                  i + 1
                )}
              </span>
              {i < steps.length - 1 && <span aria-hidden className={`mx-(--tui-stepper-gap) h-(--tui-stepper-line-width) min-w-4 flex-1 ${s.line}`} />}
            </div>
            <span className={`self-start leading-tight ${s.label}`}>
              <span className="sr-only">{state === "done" ? "Done: " : state === "current" ? "Current: " : ""}</span>
              {step}
            </span>
          </li>
        );
      })}
    </ol>
  );
}

:root {
  color-scheme: light;
  --tui-bg: #ffffff;
  --tui-fg: #0a0a0a;
  --tui-muted: #f5f5f5;
  --tui-muted-fg: #737373;
  --tui-border: #e5e5e5;
  --tui-primary: #171717;
  --tui-primary-fg: #fafafa;
  --tui-ring: #a3a3a3;
  --tui-success: #16a34a;
  --tui-warning: #d97706;
  --tui-danger: #dc2626;
  --tui-radius: 8px;
  --tui-border-width: 1px;
  --tui-space: 4px;
  --tui-shadow: none;
  --tui-font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --tui-text: 14px;
  --tui-duration: 150ms;

  /* Stepper */
  --tui-stepper-size: calc(var(--tui-space) * 7);
  --tui-stepper-gap: calc(var(--tui-space) * 2);
  --tui-stepper-line-width: 2px;
  --tui-stepper-border-width: 2px;
  --tui-stepper-radius: 999px;
  --tui-stepper-font-size: 13px;
  --tui-stepper-bg: var(--tui-bg);
  --tui-stepper-fg: var(--tui-fg);
  --tui-stepper-muted: var(--tui-muted-fg);
  --tui-stepper-line: var(--tui-border);
  --tui-stepper-done-bg: var(--tui-primary);
  --tui-stepper-done-fg: var(--tui-primary-fg);
  --tui-stepper-current-border: var(--tui-primary);
  --tui-stepper-current-weight: 600;
}

.dark,
[data-theme="dark"] {
  color-scheme: dark;
  --tui-bg: #0a0a0a;
  --tui-fg: #fafafa;
  --tui-muted: #1c1c1c;
  --tui-muted-fg: #a3a3a3;
  --tui-border: #2a2a2a;
  --tui-primary: #fafafa;
  --tui-primary-fg: #171717;
  --tui-ring: #737373;
  --tui-success: #22c55e;
  --tui-warning: #f59e0b;
  --tui-danger: #ef4444;
}