import { useState, type ReactNode } from "react";
import { ART_BASE_URL } from "../map/art/load";
import { Icon, type IconName } from "./icons";
import type { Tone } from "./Panel";

const PILL_TONES: Record<Tone, string> = {
  default: "border-space-500 bg-space-800 text-ink-200",
  muted: "border-space-600 bg-space-900 text-ink-400",
  amber: "border-amber-400/50 bg-amber-500/15 text-amber-200",
  cyan: "border-cyan-400/50 bg-cyan-500/15 text-cyan-200",
  emerald: "border-emerald-400/50 bg-emerald-500/15 text-emerald-200",
  rose: "border-rose-400/50 bg-rose-500/15 text-rose-200",
  fuchsia: "border-fuchsia-400/50 bg-fuchsia-500/15 text-fuchsia-200",
};

/** A small status or tag chip. */
export function Pill({
  tone = "default",
  icon,
  className = "",
  children,
}: {
  tone?: Tone;
  icon?: IconName;
  className?: string;
  children: ReactNode;
}) {
  return (
    <span
      className={`inline-flex items-center gap-1 rounded-full border px-2 py-0.5 font-display text-[11px] font-semibold tracking-wider whitespace-nowrap uppercase ${PILL_TONES[tone]} ${className}`}
    >
      {icon && <Icon name={icon} className="size-3" />}
      {children}
    </span>
  );
}

const METER_FILLS: Partial<Record<Tone, string>> = {
  amber: "from-amber-500 to-amber-300 shadow-[0_0_10px] shadow-amber-400/60",
  cyan: "from-cyan-500 to-sky-300 shadow-[0_0_10px] shadow-cyan-400/60",
  emerald: "from-emerald-500 to-emerald-300 shadow-[0_0_10px] shadow-emerald-400/60",
  rose: "from-rose-600 to-rose-400 shadow-[0_0_10px] shadow-rose-500/60",
  fuchsia: "from-fuchsia-500 to-fuchsia-300",
};

/** A labelled `progressbar`. `label` is its accessible name. */
export function Meter({
  label,
  value,
  min = 0,
  max = 100,
  tone = "cyan",
  size = "md",
  className = "",
}: {
  label: string;
  value: number;
  min?: number;
  max?: number;
  tone?: Tone;
  size?: "sm" | "md";
  className?: string;
}) {
  const percent = max > min ? Math.max(0, Math.min(100, ((value - min) / (max - min)) * 100)) : 0;
  return (
    <div
      role="progressbar"
      aria-label={label}
      aria-valuemin={min}
      aria-valuemax={max}
      aria-valuenow={value}
      className={`overflow-hidden rounded-full bg-space-950/80 ring-1 ring-space-600/60 ${size === "sm" ? "h-1.5" : "h-2.5"} ${className}`}
    >
      <div
        className={`h-full rounded-full bg-linear-to-r transition-[width] duration-700 ${METER_FILLS[tone] ?? METER_FILLS.cyan}`}
        style={{ width: `${percent}%` }}
      />
    </div>
  );
}

const STAT_VALUE_TONES: Partial<Record<Tone, string>> = {
  amber: "text-amber-300",
  cyan: "text-cyan-200",
  emerald: "text-emerald-300",
  rose: "text-rose-300",
};

/** A label over a big number, with an optional icon. */
export function StatTile({
  label,
  value,
  icon,
  tone = "default",
  valueLabel,
  className = "",
}: {
  label: ReactNode;
  value: ReactNode;
  icon?: IconName;
  tone?: Tone;
  /** Accessible name of the value, when tests or screen readers need it. */
  valueLabel?: string;
  className?: string;
}) {
  return (
    <div
      className={`rounded-xl border border-space-600/70 bg-space-900/70 px-3 py-2.5 shadow-panel backdrop-blur-md ${className}`}
    >
      <div className="flex items-center gap-1.5 font-display text-[11px] font-semibold tracking-[0.16em] text-ink-400 uppercase">
        {icon && <Icon name={icon} className="size-3.5" />}
        {label}
      </div>
      <div
        aria-label={valueLabel}
        className={`mt-1 font-display text-lg font-bold tabular-nums ${STAT_VALUE_TONES[tone] ?? "text-ink-50"}`}
      >
        {value}
      </div>
    </div>
  );
}

/** The page title block. `title` is the screen's level-1 heading. */
export function ScreenHeader({
  title,
  eyebrow,
  subtitle,
  icon,
  actions,
}: {
  title: string;
  eyebrow?: string;
  subtitle?: ReactNode;
  icon?: IconName;
  actions?: ReactNode;
}) {
  return (
    <div className="flex items-end justify-between gap-3">
      <div className="flex min-w-0 items-center gap-3">
        {icon && (
          <span className="grid size-11 shrink-0 place-items-center rounded-xl border border-amber-400/40 bg-amber-500/10 text-amber-300 shadow-glow-amber">
            <Icon name={icon} className="size-6" />
          </span>
        )}
        <div className="min-w-0">
          {eyebrow && (
            <div className="font-display text-[11px] font-semibold tracking-[0.22em] text-cyan-300/80 uppercase">
              {eyebrow}
            </div>
          )}
          <h1 className="font-display text-2xl leading-tight font-bold tracking-wide uppercase">
            {title}
          </h1>
          {subtitle && <p className="text-sm text-ink-300">{subtitle}</p>}
        </div>
      </div>
      {actions}
    </div>
  );
}

/** A generated map sprite's URL (decision 0.5.50). */
export function spriteUrl(sprite: string, density: "1x" | "2x" = "2x"): string {
  return `${ART_BASE_URL}/${sprite}@${density}.png`;
}

/**
 * Ship or location art. Decorative: the name is always in text beside it, so
 * `alt` is empty. A missing image hides itself (decision 0.5.50).
 */
export function Art({ sprite, className = "size-12" }: { sprite: string; className?: string }) {
  const [failed, setFailed] = useState(false);
  if (failed) return null;
  return (
    <img
      src={spriteUrl(sprite, "1x")}
      srcSet={`${spriteUrl(sprite, "1x")} 1x, ${spriteUrl(sprite, "2x")} 2x`}
      alt=""
      draggable={false}
      loading="lazy"
      onError={() => setFailed(true)}
      className={`object-contain select-none ${className}`}
    />
  );
}