/** Per-knob performance settings, shown under `?pi=1`. Stored in this browser's
 * localStorage (see lib/perfSettings.ts) and applied by a reload, because the knobs are
 * read once at module load. Nothing changes until "Speichern". */

import { useState } from "react";

import {
  FULL,
  PERF,
  PI,
  resetPerfSettings,
  savePerfSettings,
  type PerfSettings,
} from "../lib/perfSettings";

type BoolKey = { [K in keyof PerfSettings]: PerfSettings[K] extends boolean ? K : never }[keyof PerfSettings];
type NumKey = { [K in keyof PerfSettings]: PerfSettings[K] extends number ? K : never }[keyof PerfSettings];

const TOGGLES: [BoolKey, string, string][] = [
  ["ambience", "Animierter Hintergrund", "Canvas im Abspielbildschirm (größter CPU-Verbraucher)"],
  ["cardBlur", "Weichzeichner auf Karten", "Backdrop-Blur je Album-Karte und Titelzeile"],
  ["viewTransitions", "Übergänge", "Ein-/Ausblenden beim Öffnen von Gruppen und Alben"],
  ["decorativeAnimations", "Deko-Animationen", "Blasen im Zimmer, schwimmender Delfin"],
  ["cardShadows", "Schatten auf Karten", "Schlagschatten unter den Album-Karten"],
  ["tileShadows", "Schatten auf Kacheln", "Schlagschatten unter den Kacheln im Raster"],
  ["petAnimations", "Tippen: Tiere bewegen sich", "Aus: Tiere stehen still"],
  ["tippenBubbles", "Tippen: Blasen", "Aufsteigende Blasen im Hintergrund"],
  ["tippenViewTransitions", "Tippen: Übergänge", "Ein-/Ausblenden der Bildschirme"],
  ["serviceWorker", "Service Worker", "Aus: vorhandener Worker wird entfernt"],
  ["coverWarmup", "Cover vorladen", "Cover im Hintergrund dekodieren"],
];

const NUMBERS: [NumKey, string, string, number, number, number][] = [
  ["playbackClockFps", "Fortschrittsbalken: Updates/s", "0 = jeder Frame", 0, 60, 1],
  ["ambienceScale", "Hintergrund: Auflösung", "Faktor der Canvas-Größe", 0.1, 1, 0.05],
  ["ambienceMaxPx", "Hintergrund: max. Pixel", "Obergrenze je Achse", 256, 4096, 64],
  ["ambienceMaxFps", "Hintergrund: max. FPS", "0 = unbegrenzt", 0, 60, 1],
  ["ambienceMaxBubbles", "Hintergrund: max. Blasen", "0 = unbegrenzt", 0, 500, 5],
];

const pill = (background: string, color: string) =>
  ({
    border: "none",
    cursor: "pointer",
    background,
    color,
    fontSize: 15,
    fontWeight: 800,
    padding: "11px 20px",
    borderRadius: 999,
  }) as const;

export function PerfPanel({ onClose }: { onClose: () => void }) {
  const [draft, setDraft] = useState<PerfSettings>({ ...PERF });

  const save = () => {
    savePerfSettings(draft);
    location.reload();
  };
  const reset = () => {
    resetPerfSettings();
    location.reload();
  };

  return (
    <div className="overlay" style={{ zIndex: 7, background: "oklch(15% 0.03 210 / .75)" }}>
      <div className="sheet" style={{ padding: 28, width: 480, maxHeight: "100%", overflow: "auto" }}>
        <div style={{ display: "flex", alignItems: "center", gap: 12 }}>
          <div style={{ fontSize: 20, fontWeight: 900, color: "var(--ink)", flex: 1 }}>
            ⚡ Leistung
          </div>
          <button
            onClick={onClose}
            aria-label="Schließen"
            style={{
              ...pill("oklch(88% 0.02 210)", "var(--ink)"),
              fontSize: 18,
              fontWeight: 900,
              width: 36,
              height: 36,
              padding: 0,
            }}
          >
            ×
          </button>
        </div>

        <div style={{ display: "flex", gap: 10, marginTop: 16 }}>
          <button onClick={() => setDraft({ ...PI })} style={pill("oklch(88% 0.02 210)", "var(--ink)")}>
            Pi-Vorgabe
          </button>
          <button onClick={() => setDraft({ ...FULL })} style={pill("oklch(88% 0.02 210)", "var(--ink)")}>
            Alles an
          </button>
        </div>

        <div style={{ display: "flex", flexDirection: "column", gap: 12, marginTop: 18 }}>
          {TOGGLES.map(([key, label, hint]) => (
            <label key={key} style={{ display: "flex", alignItems: "center", gap: 12 }}>
              <input
                type="checkbox"
                checked={draft[key]}
                onChange={(event) => setDraft({ ...draft, [key]: event.target.checked })}
                style={{ width: 22, height: 22 }}
              />
              <span style={{ display: "flex", flexDirection: "column", gap: 2 }}>
                <span style={{ fontSize: 14, fontWeight: 800, color: "var(--ink)" }}>{label}</span>
                <span style={{ fontSize: 12, fontWeight: 600, color: "oklch(50% 0.03 210)" }}>
                  {hint}
                </span>
              </span>
            </label>
          ))}

          {NUMBERS.map(([key, label, hint, min, max, step]) => (
            <label key={key} style={{ display: "flex", flexDirection: "column", gap: 4 }}>
              <span style={{ fontSize: 14, fontWeight: 800, color: "var(--ink)" }}>{label}</span>
              <span style={{ fontSize: 12, fontWeight: 600, color: "oklch(50% 0.03 210)" }}>
                {hint}
              </span>
              <input
                type="number"
                min={min}
                max={max}
                step={step}
                value={draft[key]}
                onChange={(event) => {
                  const value = event.target.valueAsNumber;
                  if (Number.isFinite(value)) setDraft({ ...draft, [key]: value });
                }}
                style={{
                  padding: "8px 12px",
                  borderRadius: 10,
                  border: "2px solid oklch(85% 0.02 210)",
                  fontSize: 16,
                  fontWeight: 700,
                }}
              />
            </label>
          ))}

          <div style={{ display: "flex", gap: 10, marginTop: 6 }}>
            <button onClick={save} style={pill("var(--accent)", "#fff")}>
              Speichern &amp; neu laden
            </button>
            <button onClick={reset} style={pill("oklch(88% 0.02 210)", "var(--ink)")}>
              Zurücksetzen
            </button>
          </div>

          <div style={{ fontSize: 12, fontWeight: 600, color: "oklch(50% 0.03 210)", lineHeight: 1.5 }}>
            Wird nur in diesem Browser gespeichert und gilt nur mit <code>?pi=1</code>.
          </div>
        </div>
      </div>
    </div>
  );
}