import {
  Component,
  Suspense,
  useCallback,
  useEffect,
  useMemo,
  useState,
  type ErrorInfo,
  type ReactNode,
} from "react";
import { useShellStore } from "../app/shellStore";
import type { ClassId } from "../app/characterCatalog";
import type { AvatarIdentity } from "../avatar/CharacterModel";
import { resolveAvatarAppearance } from "../avatar/appearanceResolver";
import { loadAvatarTextureSet } from "../avatar/appearanceTextureCache";
import {
  availableAvatarManifestUrls,
  getAvatarEntry,
  loadAvatarManifest,
  type AvatarManifestEntry,
} from "../avatar/characterManifest";
import { resolveContentUrl } from "../content/contentManager";
import { useCombatStore } from "../game/combatStore";
import { PLAYER_EQUIPMENT_OWNER_ID } from "../game/equipment";
import { resolvedEquipmentItems } from "../game/heirloomEquipment";
import type { InventoryItem } from "../game/lootTypes";
import type { DungeonNavigationLink, DungeonTraversalRamp } from "../game/dungeonTypes";
import { preparePartyNavigationGraph } from "../game/partyNavigationAssetCache";
import { usePartyStore } from "../game/partyStore";
import { preloadTalentGameplayResources } from "../ui/talentGameplayResources";
import { useGameGLTFs } from "./useGameGLTF";

interface WarmupBoundaryProps {
  readonly children: ReactNode;
  readonly label: string;
  readonly onSettled: () => void;
}

class WarmupBoundary extends Component<WarmupBoundaryProps, { readonly failed: boolean }> {
  state = { failed: false };

  static getDerivedStateFromError() {
    return { failed: true };
  }

  componentDidCatch(error: unknown, info: ErrorInfo): void {
    console.warn(`${this.props.label} could not be fully prepared before entering the expedition.`, error, info.componentStack);
    this.props.onSettled();
  }

  render(): ReactNode {
    return this.state.failed ? null : this.props.children;
  }
}

function WarmupCommit({ onSettled }: { readonly onSettled: () => void }) {
  useEffect(() => {
    const frame = window.requestAnimationFrame(onSettled);
    return () => window.cancelAnimationFrame(frame);
  }, [onSettled]);
  return null;
}

function SceneAssetProbe({
  navigationLinks,
  traversalRamps,
  navigationUrl,
  urls,
  onSettled,
}: {
  readonly navigationLinks: readonly DungeonNavigationLink[];
  readonly traversalRamps: readonly DungeonTraversalRamp[];
  readonly navigationUrl: string | null;
  readonly urls: readonly string[];
  readonly onSettled: () => void;
}) {
  const gltfs = useGameGLTFs(urls);
  const navigationIndex = navigationUrl ? urls.indexOf(navigationUrl) : -1;
  useMemo(() => {
    if (navigationIndex < 0 || !navigationUrl) return null;
    return preparePartyNavigationGraph(
      navigationUrl,
      gltfs[navigationIndex].scene,
      navigationLinks,
      traversalRamps,
    );
  }, [gltfs, navigationIndex, navigationLinks, navigationUrl, traversalRamps]);
  return <WarmupCommit onSettled={onSettled} />;
}

interface AvatarWarmupPlan {
  readonly identity: AvatarIdentity;
  readonly entry: AvatarManifestEntry;
  readonly equipment: readonly InventoryItem[];
}

interface AvatarWarmupPayload {
  readonly modelUrls: readonly string[];
  readonly textureLoad: Promise<unknown>;
}

function AsyncWarmupCommit({
  label,
  onSettled,
  promise,
}: {
  readonly label: string;
  readonly onSettled: () => void;
  readonly promise: Promise<unknown>;
}) {
  useEffect(() => {
    let active = true;
    void promise.catch((error: unknown) => {
      console.warn(`${label} could not be fully prepared before entering the expedition.`, error);
    }).then(() => {
      if (active) onSettled();
    });
    return () => {
      active = false;
    };
  }, [label, onSettled, promise]);
  return null;
}

function ResolvedAvatarAssetProbe({
  modelUrls,
  onSettled,
  textureLoad,
}: AvatarWarmupPayload & { readonly onSettled: () => void }) {
  useGameGLTFs(modelUrls);
  return (
    <AsyncWarmupCommit
      label="Party avatar textures"
      promise={textureLoad}
      onSettled={onSettled}
    />
  );
}

function AvatarAssetProbe({ onSettled }: { readonly onSettled: () => void }) {
  const activeCharacter = useShellStore((state) => state.activeCharacter);
  const members = usePartyStore((state) => state.members);
  const inventory = useCombatStore((state) => state.inventory);
  const equipment = useCombatStore((state) => state.equipment);
  const level = useCombatStore((state) => state.level);
  const specializationId = useCombatStore((state) => state.specializationId);
  const gearRole = useCombatStore((state) => state.gearRole);
  const [payload, setPayload] = useState<AvatarWarmupPayload | null>(null);

  useEffect(() => {
    let active = true;
    setPayload(null);
    void loadAvatarManifest().then((manifest) => {
      const plans: AvatarWarmupPlan[] = [];
      if (activeCharacter) {
        const entry = getAvatarEntry(manifest, activeCharacter.raceId, activeCharacter.gender);
        if (entry) {
          plans.push({
            identity: activeCharacter,
            entry,
            equipment: resolvedEquipmentItems(equipment, inventory, {
              ownerId: PLAYER_EQUIPMENT_OWNER_ID,
              ownerKind: "player",
              classId: activeCharacter.classId,
              specializationId,
              role: gearRole,
              level,
            }),
          });
        }
      }
      for (const member of members) {
        const entry = getAvatarEntry(manifest, member.raceId, member.gender);
        if (!entry) continue;
        plans.push({
          identity: member,
          entry,
          equipment: resolvedEquipmentItems(equipment, inventory, {
            ownerId: member.id,
            ownerKind: "party",
            classId: member.classId,
            specializationId: member.specializationId,
            role: member.role,
            level: member.level,
          }),
        });
      }
      const resolvedPlans = plans.map((plan) => ({
        ...plan,
        appearance: resolveAvatarAppearance(
          manifest,
          plan.entry,
          plan.identity.appearance,
          plan.identity.classId,
          plan.equipment,
        ),
      }));
      const modelUrls = [...new Set(resolvedPlans.flatMap(({ appearance, entry }) => [
        entry.model,
        ...appearance.equipmentModels.map((model) => model.url),
      ]))].map(resolveContentUrl);
      const textureLoad = Promise.all(resolvedPlans.map((plan) => (
        loadAvatarTextureSet(manifest, plan.entry, plan.appearance)
      )));
      if (active) setPayload({ modelUrls, textureLoad });
    }).catch((error: unknown) => {
      console.warn("Party avatar assets could not be fully prepared before entering the expedition.", error);
      if (active) onSettled();
    });
    return () => {
      active = false;
    };
  }, [activeCharacter, equipment, gearRole, inventory, level, members, onSettled, specializationId]);

  if (!payload) return null;
  if (!payload.modelUrls.length) {
    return (
      <AsyncWarmupCommit
        label="Party avatar textures"
        promise={payload.textureLoad}
        onSettled={onSettled}
      />
    );
  }
  return <ResolvedAvatarAssetProbe {...payload} onSettled={onSettled} />;
}

function PartyDataProbe({ onSettled }: { readonly onSettled: () => void }) {
  const classIdsKey = usePartyStore((state) => [...new Set(state.members
    .map((member) => member.classId)
    .filter((classId) => !classId.startsWith("rom-")))]
    .sort()
    .join("|"));

  useEffect(() => {
    let active = true;
    const classIds = classIdsKey ? classIdsKey.split("|") as ClassId[] : [];
    void Promise.all(classIds.map((classId) => preloadTalentGameplayResources(classId)))
      .catch((error: unknown) => {
        console.warn("Party talent catalogs could not be fully prepared before entering the expedition.", error);
      })
      .then(() => {
        if (active) onSettled();
      });
    return () => {
      active = false;
    };
  }, [classIdsKey, onSettled]);
  return null;
}

export function ActivityAssetWarmup({
  navigationLinks,
  traversalRamps,
  navigationUrl,
  sceneAssetUrls,
  onReady,
}: {
  readonly navigationLinks: readonly DungeonNavigationLink[];
  readonly traversalRamps: readonly DungeonTraversalRamp[];
  readonly navigationUrl: string | null;
  readonly sceneAssetUrls: readonly string[];
  readonly onReady: () => void;
}) {
  const [sceneReady, setSceneReady] = useState(false);
  const [avatarsReady, setAvatarsReady] = useState(!availableAvatarManifestUrls().length);
  const [partyDataReady, setPartyDataReady] = useState(false);
  const markSceneReady = useCallback(() => setSceneReady(true), []);
  const markAvatarsReady = useCallback(() => setAvatarsReady(true), []);
  const markPartyDataReady = useCallback(() => setPartyDataReady(true), []);

  useEffect(() => {
    if (!sceneReady || !avatarsReady || !partyDataReady) return;
    onReady();
  }, [avatarsReady, onReady, partyDataReady, sceneReady]);

  return (
    <>
      {sceneAssetUrls.length ? (
        <WarmupBoundary label="Expedition models and navigation" onSettled={markSceneReady}>
          <Suspense fallback={null}>
            <SceneAssetProbe
              navigationLinks={navigationLinks}
              traversalRamps={traversalRamps}
              navigationUrl={navigationUrl}
              urls={sceneAssetUrls}
              onSettled={markSceneReady}
            />
          </Suspense>
        </WarmupBoundary>
      ) : <WarmupCommit onSettled={markSceneReady} />}
      {!avatarsReady ? (
        <WarmupBoundary label="Party avatar assets" onSettled={markAvatarsReady}>
          <Suspense fallback={null}>
            <AvatarAssetProbe onSettled={markAvatarsReady} />
          </Suspense>
        </WarmupBoundary>
      ) : null}
      <WarmupBoundary label="Party talent catalogs" onSettled={markPartyDataReady}>
        <Suspense fallback={null}>
          <PartyDataProbe onSettled={markPartyDataReady} />
        </Suspense>
      </WarmupBoundary>
    </>
  );
}