import type { CSSProperties, ReactNode } from "react";
import { Link, NavLink, Outlet, useLocation } from "react-router";
import { GameClock } from "../clock/GameClock";
import { SCREENS, type ScreenPath } from "../routes";
import { Icon } from "../ui";
import { useTrackScreen } from "./lastScreen";
import { MapBackdrop } from "./MapBackdrop";
import { panelIsWide, PanelHost } from "./PanelHost";

export interface LayoutProps {
  /** Shown at the top right. Credits arrive with the player state (Step 8.5). */
  credits?: ReactNode;
  clock?: ReactNode;
  /** Shown under the header, e.g. the offline notice. */
  banner?: ReactNode;
  /** Attention badge counts per tab (decision 0.5.49). */
  attention?: Partial<Record<ScreenPath, number>>;
}

/**
 * The shell (CR-029): the map behind everything, a floating glass header with
 * credits and game clock, the current screen in a panel, and icon navigation:
 * a bottom bar on phones, a floating rail from `md`.
 */
export function Layout({
  credits = "—",
  clock = <GameClock />,
  banner,
  attention = {},
}: LayoutProps) {
  useTrackScreen();
  const { pathname } = useLocation();
  const panelWidth = panelIsWide(pathname) ? "45rem" : "26.25rem";
  return (
    <div
      style={{ "--panel-w": panelWidth } as CSSProperties}
      className="fixed inset-0 overflow-hidden bg-space-950 text-ink-50 [--nav-h:calc(4rem+env(safe-area-inset-bottom))] md:[--nav-h:0px]"
    >
      <MapBackdrop />
      <header className="absolute inset-x-2 top-[max(0.5rem,env(safe-area-inset-top))] z-10 flex h-12 items-center justify-between gap-2 rounded-2xl border border-glass-line bg-glass px-3 md:top-4 md:right-[calc(var(--panel-w)+2rem)] md:left-24 md:backdrop-blur-xl">
        {/* The wordmark only fits beside the chips from 640 px; on phones the mark alone. */}
        <div className="flex min-w-0 items-center gap-2 overflow-hidden">
          <LogoMark />
          <span className="hidden font-title text-sm sm:inline">DEADHEAD</span>
        </div>
        <div className="flex shrink-0 items-center gap-3">
          <span className="flex items-center gap-1.5 text-ink-300">
            <span aria-label="Game clock" className="text-[13px] tabular-nums">
              {clock}
            </span>
          </span>
          <span aria-label="Credits" className="text-[15px] font-semibold tabular-nums">
            {credits}
          </span>
          <Link
            to="/settings"
            aria-label="Settings"
            className="grid size-9 place-items-center rounded-lg text-ink-300 transition hover:bg-white/8 hover:text-ink-50"
          >
            <Icon name="gear" className="size-5" />
          </Link>
        </div>
      </header>
      {banner && (
        <div className="absolute inset-x-2 top-16 z-10 overflow-hidden rounded-xl md:top-20 md:right-[calc(var(--panel-w)+2rem)] md:left-24">
          {banner}
        </div>
      )}

      <PanelHost>
        <Outlet />
      </PanelHost>

      <nav
        aria-label="Main"
        className="absolute inset-x-0 bottom-0 z-10 flex h-(--nav-h) border-t border-glass-line bg-space-950/95 pb-[env(safe-area-inset-bottom)] md:top-4 md:right-auto md:bottom-4 md:left-4 md:h-auto md:w-16 md:flex-col md:gap-1 md:overflow-y-auto md:rounded-3xl md:border md:bg-glass md:py-2 md:backdrop-blur-xl"
      >
        {SCREENS.map((screen) => (
          <NavTab
            key={screen.path}
            path={screen.path}
            label={screen.label}
            icon={screen.icon}
            badge={attention[screen.path] ?? 0}
          />
        ))}
      </nav>
    </div>
  );
}

function NavTab({
  path,
  label,
  icon,
  badge,
}: {
  path: ScreenPath;
  label: string;
  icon: (typeof SCREENS)[number]["icon"];
  badge: number;
}) {
  return (
    <NavLink
      to={path}
      end={path === "/"}
      className={({ isActive }) =>
        `relative flex min-w-0 flex-1 flex-col items-center justify-center gap-0.5 text-xs font-medium transition-colors md:flex-none md:py-2 ${
          isActive ? "text-action" : "text-ink-300 hover:text-ink-50"
        }`
      }
    >
      <span className="relative grid size-6 place-items-center">
        <Icon name={icon} className="size-5.5" />
        {badge > 0 && (
          <span
            aria-hidden="true"
            data-testid={`badge-${label}`}
            className="absolute -top-1.5 -right-2 grid h-4 min-w-4 place-items-center rounded-full bg-problem px-1 text-xs leading-none font-bold text-on-problem"
          >
            {badge > 9 ? "9+" : badge}
          </span>
        )}
      </span>
      {label}
    </NavLink>
  );
}

/** The game's mark: an orbit ring around an arrowhead. */
function LogoMark() {
  return (
    <svg aria-hidden="true" viewBox="0 0 32 32" className="size-8 shrink-0">
      <defs>
        <linearGradient id="logo-grad" x1="0" y1="0" x2="1" y2="1">
          <stop offset="0" stopColor="#fde68a" />
          <stop offset="1" stopColor="#f59e0b" />
        </linearGradient>
      </defs>
      <circle
        cx="16"
        cy="16"
        r="13"
        fill="none"
        stroke="url(#logo-grad)"
        strokeWidth="2.2"
        strokeDasharray="58 24"
        strokeLinecap="round"
        transform="rotate(-50 16 16)"
      />
      <circle cx="27.5" cy="9" r="1.8" fill="#67e8f9" />
      <path d="M16 7.5 22.5 22 16 18.5 9.5 22z" fill="url(#logo-grad)" />
    </svg>
  );
}