// Development-only visual QA surface. Loaded from scripts/combat-effects/rom-preview.html.
import { useEffect, useMemo, useRef, useState } from "react";
import { createRoot } from "react-dom/client";
import { Canvas, useFrame } from "@react-three/fiber";
import { Grid, OrbitControls } from "@react-three/drei";
import { SRGBColorSpace, TextureLoader, type Texture } from "three";
import { RunewakerParticleEffect } from "../scene/RunewakerParticleEffect";
import { parseRunewakerParticleGraph, runeLayers, type RunewakerParticleGraph } from "../scene/runewakerParticleRuntime";
import type { CombatPresentationPhase } from "../game/combatPresentation";

interface Choice { readonly model: string; readonly graphUrl: string }
interface Loaded { readonly graph: RunewakerParticleGraph; readonly textures: ReadonlyMap<string, Texture> }

function Effect({ loaded, phase, playing, replay, freezeAt }: {
  readonly loaded: Loaded; readonly phase: CombatPresentationPhase; readonly playing: boolean;
  readonly replay: number; readonly freezeAt: boolean;
}) {
  const playback = useRef({ elapsedMs: 0, decaying: false });
  useEffect(() => { playback.current.elapsedMs = 0; }, [replay, loaded]);
  useFrame((_, delta) => {
    if (!playing) return;
    playback.current.elapsedMs += Math.min(0.1, delta) * 1_000;
    if (freezeAt && playback.current.elapsedMs >= 250) playback.current.elapsedMs = 250;
    else if (playback.current.elapsedMs > 2_000) playback.current.elapsedMs = 0;
  });
  return <group position={[0, 1.1, 0]}>
    <RunewakerParticleEffect graph={loaded.graph} textures={loaded.textures} phase={phase}
      quality="high" active eventId={1} playbackRef={playback} />
  </group>;
}

function Preview() {
  const [choices, setChoices] = useState<readonly Choice[]>([]);
  const [selected, setSelected] = useState("");
  const [loaded, setLoaded] = useState<Loaded | null>(null);
  const [error, setError] = useState("");
  const [phase, setPhase] = useState<CombatPresentationPhase>("impact");
  const [playing, setPlaying] = useState(true);
  const [freezeAt, setFreezeAt] = useState(false);
  const [replay, setReplay] = useState(0);
  const loader = useMemo(() => new TextureLoader(), []);
  useEffect(() => {
    void fetch("/assets/game/combat-effects/original/runewaker/manifest.json")
      .then((response) => response.json())
      .then((index: { results: { model: string; graphUrl: string; status: string;
        rendererReady?: boolean; partialRendererReady?: boolean }[] }) => {
        const available = index.results.filter((entry) =>
          entry.status === "decoded" || entry.rendererReady || entry.partialRendererReady)
          .map(({ model, graphUrl }) => ({ model, graphUrl }));
        setChoices(available);
        setSelected(available.find((entry) => entry.model.includes("electric_ball_t_freeze_hit"))?.graphUrl
          ?? available[0]?.graphUrl ?? "");
      }).catch((reason) => setError(String(reason)));
  }, []);
  useEffect(() => {
    if (!selected) return;
    let cancelled = false;
    const ownedTextures: Texture[] = [];
    setLoaded(null); setError("");
    void fetch(selected).then((response) => response.json()).then(async (value) => {
      const graph = parseRunewakerParticleGraph(value);
      const textures = new Map<string, Texture>();
      await Promise.all(graph.textures.map(async (asset) => {
        const texture = await loader.loadAsync(asset.url);
        texture.colorSpace = SRGBColorSpace;
        ownedTextures.push(texture);
        textures.set(asset.url, texture);
      }));
      if (!cancelled) setLoaded({ graph, textures });
    }).catch((reason) => { if (!cancelled) setError(String(reason)); });
    return () => { cancelled = true; ownedTextures.forEach((texture) => texture.dispose()); };
  }, [selected, loader]);
  return <>
    <div style={{ padding: "14px 20px", display: "flex", gap: 16, alignItems: "center", flexWrap: "wrap" }}>
      <strong>RuneWaker particle preview · {choices.length} sprite models</strong>
      <label>Model <select aria-label="Model" value={selected} onChange={(event) => setSelected(event.target.value)}
        style={{ maxWidth: "55vw", padding: 8 }}>
        {choices.map((choice) => <option key={choice.graphUrl} value={choice.graphUrl}>{choice.model}</option>)}
      </select></label>
      <label>Phase <select aria-label="Phase" value={phase} onChange={(event) => setPhase(event.target.value as CombatPresentationPhase)}>
        <option value="cast-start">Cast start</option><option value="release">Release</option><option value="impact">Impact</option>
      </select></label>
      <button onClick={() => setPlaying(!playing)}>{playing ? "Pause" : "Play"}</button>
      <button onClick={() => setReplay(replay + 1)}>Replay</button>
      <label><input type="checkbox" checked={freezeAt} onChange={(event) => { setFreezeAt(event.target.checked); setReplay(replay + 1); }} />Freeze at 250 ms</label>
    </div>
    <div role="status" style={{ padding: "0 20px 8px" }}>{error || (loaded
      ? `${loaded.graph.partialRendererReady ? "Partial original" : "Ready"} · ${runeLayers(loaded.graph, phase).length} sprite layers · ${loaded.graph.textures.length} textures`
      : "Loading RuneWaker media…")}</div>
    {loaded?.graph.partialRendererReady && <div style={{ padding: "0 20px 8px" }}>
      Fidelity limit: {loaded.graph.omittedVisuals?.join(", ")}
    </div>}
    <div style={{ height: "calc(100vh - 100px)" }}>
      <Canvas camera={{ position: [3, 2.5, 5], fov: 45 }}>
        <color attach="background" args={["#0b121b"]} />
        <Grid args={[20, 20]} cellColor="#304051" sectionColor="#4a637d" fadeDistance={25} />
        <mesh position={[-1.8, 0.9, 0]}><capsuleGeometry args={[0.25, 1.25, 6, 12]} /><meshBasicMaterial color="#35465c" /></mesh>
        {loaded && <Effect key={`${selected}:${replay}`} loaded={loaded} phase={phase} playing={playing}
          replay={replay} freezeAt={freezeAt} />}
        <OrbitControls target={[0, 1, 0]} />
      </Canvas>
    </div>
  </>;
}

if (import.meta.env.DEV) {
  const root = createRoot(document.getElementById("root")!);
  root.render(<Preview />);
  if (import.meta.hot) import.meta.hot.dispose(() => root.unmount());
}