import { useMemo, useState } from "react";
import { useGameStore } from "../game/store";
import {
  DEFAULT_THREAT_METER_POSITION,
  type NormalizedHudPosition,
} from "../game/hudLayout";
import { useMenuController, type MenuAction } from "../input/useMenuController";
import { ControllerButton } from "./ControllerButton";
import {
  type CombatActorGroup,
  type CombatPresentationSettings,
  type CombatVfxMode,
  type CombatVfxQuality,
} from "../game/combatPresentation";
import {
  GAMEPLAY_FRAME_RATE_LIMITS,
  PREVIEW_FRAME_RATE_LIMITS,
  frameRateLimitLabel,
  nextFrameRateLimit,
  type GameplayFrameRateLimit,
  type PreviewFrameRateLimit,
} from "../game/frameRateSettings";
import {
  combatMediaPackReady,
  downloadCombatMediaPack,
  removeCombatMediaPack,
} from "../game/combatMediaPack";

export interface OptionsPanelSettings {
  showMobHealthBars: boolean;
  showMobAggroRanges: boolean;
  showTargetFrame: boolean;
  showThreatMeter: boolean;
  threatMeterPosition: NormalizedHudPosition;
  showFloatingCombatText: boolean;
  autoTargetNearest: boolean;
  enableScreenShake: boolean;
  masterVolume: number;
  uiScale: number;
  minimapRotation: "north-up" | "player-up";
  gameplayFrameRate: GameplayFrameRateLimit;
  previewFrameRate: PreviewFrameRateLimit;
}

export interface OptionsPanelProps {
  settings: OptionsPanelSettings;
  onChange: (patch: Partial<OptionsPanelSettings>) => void;
  onReset: () => void;
  presentationSettings: CombatPresentationSettings;
  onPresentationChange: (patch: Partial<CombatPresentationSettings>) => void;
  onPresentationReset: () => void;
  open?: boolean;
  onClose?: () => void;
}

interface ToggleOption {
  id: keyof Pick<OptionsPanelSettings,
    "showMobHealthBars" | "showMobAggroRanges" | "showTargetFrame" | "showThreatMeter" | "showFloatingCombatText" | "autoTargetNearest" | "enableScreenShake">;
  label: string;
  description: string;
}

const TOGGLES: readonly ToggleOption[] = [
  { id: "showMobHealthBars", label: "Mob health bars", description: "Show health above nearby enemies." },
  { id: "showMobAggroRanges", label: "Mob aggro ranges", description: "Show the boundary where idle dungeon enemies automatically attack your party." },
  { id: "showTargetFrame", label: "Target frame", description: "Show detailed status for your current target." },
  { id: "showThreatMeter", label: "Threat meter", description: "Show the compact movable threat table for your selected enemy." },
  { id: "showFloatingCombatText", label: "Party healing numbers", description: "Float effective healing amounts over party frames during combat." },
  { id: "autoTargetNearest", label: "Automatic targeting", description: "Pick the nearest valid enemy when an offensive ability needs one." },
  { id: "enableScreenShake", label: "Screen shake", description: "Use restrained camera impact for major hits." },
] as const;

const COMBAT_ACTOR_GROUPS: readonly CombatActorGroup[] = ["player", "party", "enemy"];
const VFX_QUALITY_ORDER: readonly CombatVfxQuality[] = ["off", "low", "high"];

type CombatMediaActionState =
  | { readonly kind: "idle" }
  | { readonly kind: "downloading"; readonly completed: number; readonly total: number }
  | { readonly kind: "removing" }
  | { readonly kind: "error"; readonly message: string };

export function nextCombatVfxMode(mode: CombatVfxMode): CombatVfxMode {
  return mode === "generated" ? "original" : "generated";
}

function actorGroupLabel(group: CombatActorGroup): string {
  return group === "enemy" ? "Enemies" : `${group[0].toUpperCase()}${group.slice(1)}`;
}

function quantize(value: number, step: number, minimum: number, maximum: number): number {
  const next = Math.round(value / step) * step;
  return Math.max(minimum, Math.min(maximum, Number(next.toFixed(2))));
}

function OptionsDialog({
  settings,
  onChange,
  onReset,
  presentationSettings,
  onPresentationChange,
  onPresentationReset,
  onClose,
}: Required<Omit<OptionsPanelProps, "open">>) {
  const [combatMediaAction, setCombatMediaAction] = useState<CombatMediaActionState>({ kind: "idle" });
  const combatMediaInstalled = combatMediaPackReady();
  const originalMediaReady = presentationSettings.originalMediaEnabled && combatMediaInstalled;
  const patchGroupBoolean = (
    field: "vfxEnabled" | "audioEnabled",
    group: CombatActorGroup,
    value: boolean,
  ) => onPresentationChange({ [field]: { ...presentationSettings[field], [group]: value } });
  const patchGroupVolume = (group: CombatActorGroup, value: number) => onPresentationChange({
    audioVolume: { ...presentationSettings.audioVolume, [group]: quantize(value, 0.1, 0, 1) },
  });
  const cycleVfxQuality = () => {
    const index = VFX_QUALITY_ORDER.indexOf(presentationSettings.vfxQuality);
    onPresentationChange({ vfxQuality: VFX_QUALITY_ORDER[(index + 1) % VFX_QUALITY_ORDER.length] });
  };
  const cycleVfxMode = () => {
    if (!originalMediaReady) return;
    onPresentationChange({ vfxMode: nextCombatVfxMode(presentationSettings.vfxMode) });
  };
  const toggleOriginalMedia = () => {
    if (combatMediaAction.kind === "downloading" || combatMediaAction.kind === "removing") return;
    if (combatMediaInstalled && !presentationSettings.originalMediaEnabled) {
      onPresentationChange({ originalMediaEnabled: true, vfxMode: "original" });
      return;
    }
    if (combatMediaInstalled) {
      setCombatMediaAction({ kind: "removing" });
      void removeCombatMediaPack().then(() => {
        onPresentationChange({ originalMediaEnabled: false });
        setCombatMediaAction({ kind: "idle" });
      }).catch((error: unknown) => setCombatMediaAction({
        kind: "error",
        message: error instanceof Error ? error.message : "Could not remove the local combat media.",
      }));
      return;
    }
    setCombatMediaAction({ kind: "downloading", completed: 0, total: 1 });
    void downloadCombatMediaPack(({ completed, total }) => {
      setCombatMediaAction({ kind: "downloading", completed, total });
    }).then(() => {
      onPresentationChange({ originalMediaEnabled: true, vfxMode: "original" });
      setCombatMediaAction({ kind: "idle" });
    }).catch((error: unknown) => setCombatMediaAction({
      kind: "error",
      message: error instanceof Error ? error.message : "Could not download the combat media.",
    }));
  };
  const combatMediaButtonLabel = combatMediaAction.kind === "downloading"
    ? `Downloading ${Math.round(combatMediaAction.completed / Math.max(1, combatMediaAction.total) * 100)}%`
    : combatMediaAction.kind === "removing"
      ? "Removing…"
      : combatMediaInstalled && !presentationSettings.originalMediaEnabled
        ? "Enable"
        : combatMediaInstalled
        ? "Remove"
        : "Download";
  const cycleGameplayFrameRate = () => onChange({
    gameplayFrameRate: nextFrameRateLimit(settings.gameplayFrameRate, GAMEPLAY_FRAME_RATE_LIMITS),
  });
  const cyclePreviewFrameRate = () => onChange({
    previewFrameRate: nextFrameRateLimit(settings.previewFrameRate, PREVIEW_FRAME_RATE_LIMITS),
  });
  const actions = useMemo<MenuAction[]>(() => [
    { id: "option-keybinds", run: () => useGameStore.getState().openOverlay("keybinds") },
    { id: "option-gameplay-frame-rate", run: cycleGameplayFrameRate },
    { id: "option-preview-frame-rate", run: cyclePreviewFrameRate },
    ...TOGGLES.map((option) => ({
      id: `option-${option.id}`,
      run: () => onChange({ [option.id]: !settings[option.id] }),
    })),
    { id: "option-volume-down", run: () => onChange({ masterVolume: quantize(settings.masterVolume - 0.1, 0.1, 0, 1) }) },
    { id: "option-volume-up", run: () => onChange({ masterVolume: quantize(settings.masterVolume + 0.1, 0.1, 0, 1) }) },
    { id: "option-scale-down", run: () => onChange({ uiScale: quantize(settings.uiScale - 0.05, 0.05, 0.75, 1.25) }) },
    { id: "option-scale-up", run: () => onChange({ uiScale: quantize(settings.uiScale + 0.05, 0.05, 0.75, 1.25) }) },
    { id: "option-minimap", run: () => onChange({ minimapRotation: settings.minimapRotation === "north-up" ? "player-up" : "north-up" }) },
    { id: "option-threat-position", run: () => onChange({ threatMeterPosition: DEFAULT_THREAT_METER_POSITION }) },
    { id: "option-original-media", run: toggleOriginalMedia },
    { id: "option-vfx-mode", run: cycleVfxMode },
    { id: "option-vfx-quality", run: cycleVfxQuality },
    ...COMBAT_ACTOR_GROUPS.flatMap((group) => [
      {
        id: `option-vfx-${group}`,
        run: () => patchGroupBoolean("vfxEnabled", group, !presentationSettings.vfxEnabled[group]),
      },
      {
        id: `option-audio-${group}`,
        run: () => patchGroupBoolean("audioEnabled", group, !presentationSettings.audioEnabled[group]),
      },
      {
        id: `option-audio-${group}-down`,
        run: () => patchGroupVolume(group, presentationSettings.audioVolume[group] - 0.1),
      },
      {
        id: `option-audio-${group}-up`,
        run: () => patchGroupVolume(group, presentationSettings.audioVolume[group] + 0.1),
      },
    ]),
    { id: "option-reset", run: () => { onReset(); onPresentationReset(); } },
  ], [combatMediaAction.kind, onChange, onPresentationChange, onPresentationReset, onReset, presentationSettings, settings]);
  const controller = useMenuController(actions, { columns: 1, onBack: onClose });

  const optionButton = (id: string, label: string, run: () => void, disabled = false) => (
    <ControllerButton
      controlId={id}
      selectedId={controller.selectedId}
      select={controller.select}
      type="button"
      disabled={disabled}
      onClick={run}
    >{label}</ControllerButton>
  );

  return (
    <div className="modal-backdrop game-panel-backdrop" role="presentation">
      <section className="game-panel options-panel" role="dialog" aria-modal="true" aria-labelledby="options-title">
        <header className="game-panel__header">
          <div><p className="eyebrow">Gameplay and interface</p><h2 id="options-title">Options</h2></div>
          <button type="button" className="icon-button" onClick={onClose} aria-label="Return to pause menu">×</button>
        </header>

        <div className="options-panel__list">
          <div className="option-row"><span><strong>Keybinds</strong><small>View and change every PC and Controller action. Resolve conflicts or restore movement.</small></span>
            {optionButton("option-keybinds", "Keybinds", () => useGameStore.getState().openOverlay("keybinds"))}
          </div>
          <h3 className="options-panel__section-title">Performance</h3>
          <div className="option-row">
            <span><strong>Gameplay frame rate</strong><small>Limit 3D gameplay rendering without changing combat or physics timing.</small></span>
            {optionButton(
              "option-gameplay-frame-rate",
              frameRateLimitLabel(settings.gameplayFrameRate),
              cycleGameplayFrameRate,
            )}
          </div>
          <div className="option-row">
            <span><strong>Character preview frame rate</strong><small>Limit animated character previews shown in menus.</small></span>
            {optionButton(
              "option-preview-frame-rate",
              frameRateLimitLabel(settings.previewFrameRate),
              cyclePreviewFrameRate,
            )}
          </div>
          <h3 className="options-panel__section-title">Gameplay and interface</h3>
          {TOGGLES.map((option) => (
            <div key={option.id} className="option-row">
              <span><strong>{option.label}</strong><small>{option.description}</small></span>
              <ControllerButton
                controlId={`option-${option.id}`}
                selectedId={controller.selectedId}
                select={controller.select}
                type="button"
                className={settings[option.id] ? "is-on" : ""}
                aria-pressed={settings[option.id]}
                onClick={() => onChange({ [option.id]: !settings[option.id] })}
              >{settings[option.id] ? "On" : "Off"}</ControllerButton>
            </div>
          ))}
          <div className="option-row">
            <span><strong>Master volume</strong><small>Overall game audio volume.</small></span>
            <div className="option-stepper">
              {optionButton("option-volume-down", "−", () => onChange({ masterVolume: quantize(settings.masterVolume - 0.1, 0.1, 0, 1) }), settings.masterVolume <= 0)}
              <output>{Math.round(settings.masterVolume * 100)}%</output>
              {optionButton("option-volume-up", "+", () => onChange({ masterVolume: quantize(settings.masterVolume + 0.1, 0.1, 0, 1) }), settings.masterVolume >= 1)}
            </div>
          </div>
          <div className="option-row">
            <span><strong>Interface scale</strong><small>Resize HUD and menu elements for either Thor display or PC.</small></span>
            <div className="option-stepper">
              {optionButton("option-scale-down", "−", () => onChange({ uiScale: quantize(settings.uiScale - 0.05, 0.05, 0.75, 1.25) }), settings.uiScale <= 0.75)}
              <output>{Math.round(settings.uiScale * 100)}%</output>
              {optionButton("option-scale-up", "+", () => onChange({ uiScale: quantize(settings.uiScale + 0.05, 0.05, 0.75, 1.25) }), settings.uiScale >= 1.25)}
            </div>
          </div>
          <div className="option-row">
            <span><strong>Minimap orientation</strong><small>Keep north fixed or rotate the map with your character.</small></span>
            {optionButton("option-minimap", settings.minimapRotation === "north-up" ? "North up" : "Player up", () => onChange({
              minimapRotation: settings.minimapRotation === "north-up" ? "player-up" : "north-up",
            }))}
          </div>
          <div className="option-row">
            <span><strong>Threat meter position</strong><small>Drag its title bar during combat, or restore its suggested location.</small></span>
            {optionButton("option-threat-position", "Reset position", () => onChange({
              threatMeterPosition: DEFAULT_THREAT_METER_POSITION,
            }))}
          </div>
          <h3 className="options-panel__section-title">Combat presentation</h3>
          <div className="option-row">
            <span>
              <strong>Original spell effects &amp; sounds</strong>
              <small>{originalMediaReady
                ? "Stored on this device. Original spell effects and sounds are ready. Missing sounds stay silent."
                : combatMediaInstalled
                  ? "Stored on this device. Enable the pack to use original visuals and authentic combat sounds."
                : "Original spell effects and sounds download automatically when enabled. Generated visuals cover missing effects; missing sounds stay silent."}</small>
              {combatMediaAction.kind === "error"
                ? <small role="status">{combatMediaAction.message}</small>
                : null}
            </span>
            {optionButton(
              "option-original-media",
              combatMediaButtonLabel,
              toggleOriginalMedia,
              combatMediaAction.kind === "downloading" || combatMediaAction.kind === "removing",
            )}
          </div>
          <div className="option-row">
            <span>
              <strong>Spell visual mode</strong>
              <small>{!originalMediaReady
                ? "Original effects are preferred by default. Generated visuals are the backup while original media is unavailable."
                : presentationSettings.vfxMode === "original"
                ? "Use original spell effects first, with generated visuals only when an original effect is unavailable."
                : "Use the current generated combat effects."}</small>
            </span>
            {optionButton(
              "option-vfx-mode",
              presentationSettings.vfxMode === "original" ? "Original" : "Generated",
              cycleVfxMode,
              !originalMediaReady,
            )}
          </div>
          <div className="option-row">
            <span><strong>VFX quality</strong><small>High uses the full effect budget; Low reduces particles and simultaneous effects; Off skips combat VFX.</small></span>
            {optionButton("option-vfx-quality", presentationSettings.vfxQuality[0].toUpperCase() + presentationSettings.vfxQuality.slice(1), cycleVfxQuality)}
          </div>
          {COMBAT_ACTOR_GROUPS.map((group) => (
            <div className="options-panel__combat-group" key={group}>
              <div className="option-row">
                <span><strong>{actorGroupLabel(group)} VFX</strong><small>Show attacks, spells, trails, impacts, and auras from this group.</small></span>
                <ControllerButton
                  controlId={`option-vfx-${group}`}
                  selectedId={controller.selectedId}
                  select={controller.select}
                  type="button"
                  className={presentationSettings.vfxEnabled[group] ? "is-on" : ""}
                  aria-pressed={presentationSettings.vfxEnabled[group]}
                  onClick={() => patchGroupBoolean("vfxEnabled", group, !presentationSettings.vfxEnabled[group])}
                >{presentationSettings.vfxEnabled[group] ? "On" : "Off"}</ControllerButton>
              </div>
              <div className="option-row">
                <span><strong>{actorGroupLabel(group)} combat audio</strong><small>Mute or mix ability and weapon sounds from this group.</small></span>
                <div className="option-audio-controls">
                  <ControllerButton
                    controlId={`option-audio-${group}`}
                    selectedId={controller.selectedId}
                    select={controller.select}
                    type="button"
                    className={presentationSettings.audioEnabled[group] ? "is-on" : ""}
                    aria-pressed={presentationSettings.audioEnabled[group]}
                    onClick={() => patchGroupBoolean("audioEnabled", group, !presentationSettings.audioEnabled[group])}
                  >{presentationSettings.audioEnabled[group] ? "On" : "Muted"}</ControllerButton>
                  <div className="option-stepper">
                    {optionButton(`option-audio-${group}-down`, "−", () => patchGroupVolume(group, presentationSettings.audioVolume[group] - 0.1), presentationSettings.audioVolume[group] <= 0)}
                    <output>{Math.round(presentationSettings.audioVolume[group] * 100)}%</output>
                    {optionButton(`option-audio-${group}-up`, "+", () => patchGroupVolume(group, presentationSettings.audioVolume[group] + 0.1), presentationSettings.audioVolume[group] >= 1)}
                  </div>
                </div>
              </div>
            </div>
          ))}
        </div>

        <div className="options-panel__actions">
          <ControllerButton controlId="option-reset" selectedId={controller.selectedId} select={controller.select} type="button" className="button" onClick={() => { onReset(); onPresentationReset(); }}>Restore defaults</ControllerButton>
          <button type="button" className="button button--primary" onClick={onClose}>Done</button>
        </div>
        <footer className="game-panel__footer"><span><kbd>A</kbd> Change</span><span><kbd>B</kbd> Pause menu</span></footer>
      </section>
    </div>
  );
}

export function OptionsPanel(props: OptionsPanelProps) {
  const storeOpen = useGameStore((state) => state.overlay === "options");
  const openOverlay = useGameStore((state) => state.openOverlay);
  const close = props.onClose ?? (() => openOverlay("pause"));
  if (!(props.open ?? storeOpen)) return null;
  return <OptionsDialog {...props} onClose={close} />;
}