import { lazy, Suspense, useMemo } from "react";
import { classById } from "../app/characterCatalog";
import { useShellStore } from "../app/shellStore";
import { useCombatStore } from "../game/combatStore";
import {
  abilityAtLevel,
  abilityRankForLevel,
} from "../game/abilityCatalog";
import { useGameStore } from "../game/store";
import { OptionsPanel } from "./OptionsPanel";
import { AbilityBindingsPanel } from "./AbilityBindingsPanel";
import { SpellbookPanel } from "./SpellbookPanel";
import { EquipmentPanel } from "./EquipmentPanel";
import { RomSkillsPanel } from "./RomSkillsPanel";
import { getLoadedTalentGameplayPanel, loadTalentGameplayPanel } from "./talentGameplayResources";
import {
  getLoadedBossGuidePanel,
  getLoadedPartyManagementPanel,
  loadBossGuidePanel,
  loadPartyManagementPanel,
} from "./gameplayResources";

const PartyManagementPanel = lazy(() => loadPartyManagementPanel().then((module) => ({ default: module.PartyManagementPanel })));
const BossGuidePanel = lazy(() => loadBossGuidePanel().then((module) => ({ default: module.BossGuidePanel })));

const TalentGameplayPanel = lazy(loadTalentGameplayPanel);

function TalentsPanelLoading() {
  const openOverlay = useGameStore((state) => state.openOverlay);
  return (
    <div className="modal-backdrop game-panel-backdrop" role="presentation">
      <section className="game-panel talents-panel talents-panel--loading" role="dialog" aria-modal="true" aria-labelledby="talents-loading-title">
        <header className="game-panel__header">
          <div>
            <p className="eyebrow">Specialization</p>
            <h2 id="talents-loading-title">Talents</h2>
          </div>
          <button type="button" className="icon-button" onClick={() => openOverlay("pause")} aria-label="Return to pause menu">×</button>
        </header>
        <p className="game-panel__empty" role="status">Preparing talent trees…</p>
      </section>
    </div>
  );
}

/** Maps the data-driven combat catalogs into the full-screen game panels. */
export function GameplayPanels() {
  const classId = useCombatStore((state) => state.classId);
  const level = useCombatStore((state) => state.level);
  const abilities = useCombatStore((state) => state.abilities);
  const talentRanks = useCombatStore((state) => state.talentRanks);
  const settings = useCombatStore((state) => state.settings);
  const presentationSettings = useShellStore((state) => state.combatPresentationSettings);
  const overlay = useGameStore((state) => state.overlay);
  const classDefinition = classById(classId);
  const PreloadedTalentGameplayPanel = getLoadedTalentGameplayPanel();
  const PreloadedPartyManagementPanel = getLoadedPartyManagementPanel();
  const PreloadedBossGuidePanel = getLoadedBossGuidePanel();

  const spellbookAbilities = useMemo(() => [...abilities]
    .sort((left, right) => left.unlockLevel - right.unlockLevel)
    .map((catalogAbility) => {
      const learnedTalentRank = catalogAbility.talentEntryId === undefined
        ? undefined
        : talentRanks[`coa-entry-${catalogAbility.talentEntryId}`] ?? 0;
      const ability = abilityAtLevel(catalogAbility, level, learnedTalentRank);
      const activeRank = abilityRankForLevel(catalogAbility, level, learnedTalentRank);
      return {
        id: ability.id,
        name: ability.name,
        description: ability.description,
        level: ability.unlockLevel,
        color: classDefinition.color,
        sigil: ability.sigil,
        iconUrl: ability.icon,
        school: classDefinition.name,
        resourceCost: ability.cost.amount,
        resourceLabel: useCombatStore.getState().resourceName,
        cooldownSeconds: ability.cooldownMs / 1_000,
        castSeconds: ability.castTimeMs / 1_000,
        range: ability.range.max,
        known: catalogAbility.talentEntryId === undefined || Boolean(learnedTalentRank),
        talentLocked: catalogAbility.talentEntryId !== undefined,
        passive: ability.passive,
        rank: activeRank?.rank,
        rankCount: catalogAbility.ranks?.length,
        ranks: catalogAbility.ranks?.map((rank) => ({
          rank: rank.rank,
          level: rank.level,
          spellId: rank.spellId,
          description: rank.description,
        })),
      };
    }), [abilities, classDefinition.color, classDefinition.name, level, talentRanks]);

  const castAbility = (abilityId: string) => {
    const game = useGameStore.getState();
    game.closeOverlay();
    useCombatStore.getState().castAbility(abilityId, game.playerPosition, Date.now());
  };

  return (
    <>
      {overlay === "party"
        ? PreloadedPartyManagementPanel
          ? <PreloadedPartyManagementPanel />
          : <Suspense fallback={null}><PartyManagementPanel /></Suspense>
        : null}
      {overlay === "boss-guide"
        ? PreloadedBossGuidePanel
          ? <PreloadedBossGuidePanel />
          : <Suspense fallback={null}><BossGuidePanel /></Suspense>
        : null}
      <EquipmentPanel />
      <AbilityBindingsPanel />
      <SpellbookPanel abilities={spellbookAbilities} playerLevel={level} onActivate={castAbility} />
      {overlay === "talents"
        ? classId.startsWith("rom-")
          ? <RomSkillsPanel />
          : PreloadedTalentGameplayPanel
            ? <PreloadedTalentGameplayPanel />
            : <Suspense fallback={<TalentsPanelLoading />}><TalentGameplayPanel /></Suspense>
        : null}
      <OptionsPanel
        settings={settings}
        onChange={(patch) => useCombatStore.getState().updateSettings(patch)}
        onReset={() => useCombatStore.getState().resetSettings()}
        presentationSettings={presentationSettings}
        onPresentationChange={(patch) => useShellStore.getState().updateCombatPresentationSettings(patch)}
        onPresentationReset={() => useShellStore.getState().resetCombatPresentationSettings()}
      />
    </>
  );
}