import { useState } from "react";
import type { ReactNode } from "react";
import { WelcomeCards } from "../components/Welcome";
import { SpendingFloor } from "../components/IndependentPilots";
import { resetMapView } from "../map/camera";
import { About } from "./AboutSettings";
import { CompanyName, NewCompany } from "./CompanySettings";
import { DevTools } from "./DevTools";
import { ExportSave, ImportSave } from "./SaveSettings";
import { useLoadedPlayer } from "../state/actions";
import { usePreferences, type ClockFormat, type CountdownFormat } from "../state/preferences";
import { Button, Panel, Screen, ScreenHeader } from "../ui";

/** Developer tools only exist in non-production builds (CR-011). */
export function isDevBuild(): boolean {
  return !import.meta.env.PROD;
}

/** Settings (CR-011): company, display, help, about and, in development, developer tools. */
export function Settings() {
  const state = useLoadedPlayer();
  const prefs = usePreferences();
  const [howToPlay, setHowToPlay] = useState(false);

  return (
    <Screen className="max-w-2xl">
      <ScreenHeader title="Settings" eyebrow={state.company.name} icon="gear" />

      <Section title="Company">
        <CompanyName />
        <SpendingFloor />
        <div className="flex flex-wrap gap-2">
          <ExportSave />
          <ImportSave hasCompany />
          <NewCompany />
        </div>
      </Section>

      <Section title="Display">
        <Choice<ClockFormat>
          label="Clock"
          value={prefs.clock}
          options={[
            ["locale", "Device"],
            ["12h", "12-hour"],
            ["24h", "24-hour"],
          ]}
          onChange={(clock) => prefs.set({ clock })}
        />
        <Choice<CountdownFormat>
          label="Countdowns"
          value={prefs.countdown}
          options={[
            ["real", "Real time"],
            ["game", "Game time"],
            ["both", "Both"],
          ]}
          onChange={(countdown) => prefs.set({ countdown })}
        />
        <Choice<"device" | "on" | "off">
          label="Reduced motion"
          value={prefs.reducedMotion === null ? "device" : prefs.reducedMotion ? "on" : "off"}
          options={[
            ["device", "Device"],
            ["on", "On"],
            ["off", "Off"],
          ]}
          onChange={(v) => prefs.set({ reducedMotion: v === "device" ? null : v === "on" })}
        />
      </Section>

      <Section title="Notifications">
        <Choice<"on" | "off">
          label="Arrivals, rest and upgrades"
          value={prefs.notifications ? "on" : "off"}
          options={[
            ["on", "On"],
            ["off", "Off"],
          ]}
          onChange={(v) => prefs.set({ notifications: v === "on" })}
        />
        <p className="text-xs text-ink-400">On the iOS and Android apps only.</p>
      </Section>

      <Section title="Help">
        <div className="flex flex-wrap gap-2">
          <Button variant="secondary" size="sm" onClick={resetMapView}>
            Reset map view
          </Button>
          <Button variant="secondary" size="sm" onClick={() => prefs.showTipsAgain()}>
            Show tips again
          </Button>
          <Button variant="secondary" size="sm" onClick={() => setHowToPlay(true)}>
            How to play
          </Button>
        </div>
        {/* The welcome cards again, ending in Close (decision 0.5.132). */}
        {howToPlay && <WelcomeCards final="close" onClose={() => setHowToPlay(false)} />}
      </Section>

      <Section title="About">
        <About />
      </Section>

      {isDevBuild() && (
        <Section title="Developer">
          <DevTools />
        </Section>
      )}
    </Screen>
  );
}

function Section({ title, children }: { title: string; children: ReactNode }) {
  const id = `settings-${title.toLowerCase()}`;
  return (
    <Panel as="section" aria-labelledby={id} className="space-y-3">
      <h2 id={id} className="font-display text-sm font-bold tracking-wider text-ink-300 uppercase">
        {title}
      </h2>
      {children}
    </Panel>
  );
}

/** A labelled radio group of a few options, styled as a segmented control. */
function Choice<T extends string>(props: {
  label: string;
  value: T;
  options: [T, string][];
  onChange: (value: T) => void;
}) {
  return (
    <fieldset className="flex flex-wrap items-center justify-between gap-2 text-sm">
      <legend className="float-left text-ink-400">{props.label}</legend>
      <div className="flex overflow-hidden rounded-lg border border-space-600">
        {props.options.map(([value, text]) => (
          <label
            key={value}
            className="cursor-pointer px-3 py-1.5 has-checked:bg-amber-500/20 has-checked:text-amber-100 has-focus-visible:ring-2"
          >
            <input
              type="radio"
              name={props.label}
              value={value}
              checked={props.value === value}
              onChange={() => props.onChange(value)}
              className="sr-only"
            />
            {text}
          </label>
        ))}
      </div>
    </fieldset>
  );
}