import type { GLBAssetBuffer } from "./glb-export";
import type { SceneSnapshotIR } from "./scene-ir";

const GLB_MAGIC = 0x46546c67;
const JSON_CHUNK = 0x4e4f534a;
const BIN_CHUNK = 0x004e4942;

interface GLBAccessor {
  bufferView?: number;
  byteOffset?: number;
  componentType: number;
  count: number;
  type: string;
  normalized?: boolean;
  min?: number[];
  max?: number[];
  sparse?: Record<string, unknown>;
}

interface GLBBufferView {
  buffer: number;
  byteOffset?: number;
  byteLength: number;
}

interface GLBPrimitive {
  attributes?: Record<string, number>;
  indices?: number;
  material?: number;
  mode?: number;
  targets?: Array<Record<string, number>>;
}

interface GLBDocument {
  asset?: { version?: string; generator?: string };
  scene?: number;
  scenes?: Array<{ nodes?: number[] }>;
  extensionsUsed?: string[];
  extensionsRequired?: string[];
  buffers?: Array<{ byteLength?: number; uri?: string }>;
  bufferViews?: GLBBufferView[];
  accessors?: GLBAccessor[];
  meshes?: Array<{ name?: string; primitives?: GLBPrimitive[]; extras?: Record<string, unknown> }>;
  images?: Array<{ name?: string; mimeType?: string; bufferView?: number; uri?: string; extras?: Record<string, unknown> }>;
  samplers?: Array<Record<string, unknown>>;
  textures?: Array<{ sampler?: number; source?: number }>;
  materials?: Array<{
    name?: string;
    alphaMode?: string;
    doubleSided?: boolean;
    pbrMetallicRoughness?: {
      baseColorFactor?: number[];
      baseColorTexture?: Record<string, unknown>;
      metallicFactor?: number;
      roughnessFactor?: number;
    };
    normalTexture?: Record<string, unknown>;
    emissiveFactor?: number[];
  }>;
  nodes?: Array<{
    name?: string;
    mesh?: number;
    skin?: number;
    children?: number[];
    translation?: number[];
    rotation?: number[];
    scale?: number[];
  }>;
  skins?: Array<{ name?: string; joints?: number[]; inverseBindMatrices?: number; skeleton?: number; extras?: Record<string, unknown> }>;
  animations?: Array<{
    name?: string;
    samplers?: Array<{ input?: number; output?: number; interpolation?: string }>;
    channels?: Array<{ sampler?: number; target?: { node?: number; path?: string } }>;
    extras?: Record<string, unknown>;
  }>;
}

export const GLB_IMPORT_BUDGET = {
  maxBytes: 512 * 1024,
  maxJsonBytes: 256 * 1024,
  maxBufferViews: 4096,
  maxAccessors: 8192,
} as const;

export interface ImportedGLBImage {
  name?: string;
  blenderId?: string;
  mimeType?: string;
  byteLength: number;
  signature: number[];
}

export interface ImportedGLBSemantics {
  version: 2;
  meshCount: number;
  primitiveCount: number;
  meshes: Array<{ name?: string; blenderId?: string; primitiveCount: number; attributes: string[]; morphTargetCount: number }>;
  images: ImportedGLBImage[];
  skinCount: number;
  skins: Array<{ jointCount: number; inverseBindType?: string; inverseBindCount?: number }>;
  animationCount: number;
  animationChannelCount: number;
  animationPaths: string[];
}

export interface GLBSemanticComparison {
  compatible: boolean;
  mismatches: string[];
}

export interface GLBDesktopAccessorSemantics {
  componentType: number;
  count: number;
  type: string;
  normalized: boolean;
  min: number[] | null;
  max: number[] | null;
}

export interface GLBDesktopFixtureSemantics {
  asset: { version?: string; generator?: string } | null;
  extensionsUsed: string[];
  extensionsRequired: string[];
  scene: number | null;
  nodeNames: Array<string | null>;
  nodes: Array<{
    name: string | null;
    mesh: number | null;
    skin: number | null;
    children: number[];
    translation: number[] | null;
    rotation: number[] | null;
    scale: number[] | null;
  }>;
  meshes: Array<{
    name: string | null;
    primitives: Array<{
      attributes: Record<string, GLBDesktopAccessorSemantics>;
      indices: GLBDesktopAccessorSemantics | null;
      material: number | null;
      mode: number;
      targets: Array<Record<string, GLBDesktopAccessorSemantics>>;
    }>;
  }>;
  materials: Array<{
    name: string | null;
    alphaMode: string;
    doubleSided: boolean;
    pbr: {
      baseColorFactor: number[] | null;
      baseColorTexture: Record<string, unknown> | null;
      metallicFactor: number | null;
      roughnessFactor: number | null;
    };
    normalTexture: Record<string, unknown> | null;
    emissiveFactor: number[] | null;
  }>;
  textures: Array<Record<string, unknown>>;
  images: Array<Record<string, unknown>>;
  samplers: Array<Record<string, unknown>>;
  skins: Array<{
    name: string | null;
    joints: number[];
    inverseBindMatrices: GLBDesktopAccessorSemantics | null;
    skeleton: number | null;
  }>;
  animations: Array<{
    name: string | null;
    samplers: Array<{
      interpolation: string;
      input: GLBDesktopAccessorSemantics | null;
      output: GLBDesktopAccessorSemantics | null;
    }>;
    channels: Array<{ sampler: number; target: { node: number; path: string } }>;
  }>;
}

function recordId(extras: Record<string, unknown> | undefined): string | undefined {
  return typeof extras?.blenderId === "string" ? extras.blenderId : undefined;
}

function requireIndex(value: unknown, size: number, label: string): number {
  if (!Number.isSafeInteger(value) || (value as number) < 0 || (value as number) >= size) throw new Error(`${label} index is out of range`);
  return value as number;
}

function jsonChunk(bytes: Uint8Array, length: number): GLBDocument {
  if (bytes.byteLength > GLB_IMPORT_BUDGET.maxBytes) throw new Error(`GLB_IMPORT_BUDGET_EXCEEDED: file exceeds ${GLB_IMPORT_BUDGET.maxBytes} bytes`);
  const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
  if (bytes.byteLength < 20 || view.getUint32(0, true) !== GLB_MAGIC || view.getUint32(4, true) !== 2) throw new Error("GLB header is invalid");
  if (view.getUint32(8, true) !== bytes.byteLength) throw new Error("GLB length does not match header");
  const jsonLength = view.getUint32(12, true);
  if (jsonLength > GLB_IMPORT_BUDGET.maxJsonBytes || view.getUint32(16, true) !== JSON_CHUNK || jsonLength % 4 !== 0 || 20 + jsonLength > bytes.byteLength) throw new Error("GLB JSON chunk is invalid");
  let document: unknown;
  try {
    document = JSON.parse(new TextDecoder().decode(bytes.subarray(20, 20 + jsonLength)).trim());
  }
  catch (error) {
    throw new Error(`GLB JSON is invalid: ${error instanceof Error ? error.message : "parse failed"}`);
  }
  if (typeof document !== "object" || document === null || Array.isArray(document)) throw new Error("GLB JSON document is invalid");
  if ((document as GLBDocument).asset?.version !== "2.0") throw new Error("GLB asset version is not 2.0");
  return document as GLBDocument;
}

function bufferViewBytes(bytes: Uint8Array, jsonLength: number, view: GLBBufferView, label: string): Uint8Array {
  if (view.buffer !== 0 || !Number.isSafeInteger(view.byteLength) || view.byteLength < 0) throw new Error(`${label} bufferView is invalid`);
  const binaryStart = 20 + jsonLength + 8;
  const offset = view.byteOffset ?? 0;
  if (!Number.isSafeInteger(offset) || offset < 0 || binaryStart + offset + view.byteLength > bytes.byteLength) throw new Error(`${label} bufferView exceeds BIN chunk`);
  return bytes.subarray(binaryStart + offset, binaryStart + offset + view.byteLength);
}

export function importGLBSemantics(glb: ArrayBuffer): ImportedGLBSemantics {
  const bytes = new Uint8Array(glb);
  const view = new DataView(glb);
  const jsonLength = view.getUint32(12, true);
  const document = jsonChunk(bytes, glb.byteLength);
  if ((document.extensionsUsed?.length ?? 0) > 0 || (document.extensionsRequired?.length ?? 0) > 0) throw new Error("GLB_EXTENSION_UNSUPPORTED: extensions are outside the bounded importer");
  if ((document.buffers ?? []).some((buffer) => buffer.uri !== undefined) || (document.images ?? []).some((image) => image.uri !== undefined)) throw new Error("GLB_EXTERNAL_URI_BLOCKED: external URI resources are not accepted");
  const bufferViews = document.bufferViews ?? [];
  const accessors = document.accessors ?? [];
  if (bufferViews.length > GLB_IMPORT_BUDGET.maxBufferViews || accessors.length > GLB_IMPORT_BUDGET.maxAccessors) throw new Error("GLB_IMPORT_BUDGET_EXCEEDED: accessor or bufferView count exceeds the bounded importer");
  for (const [index, bufferView] of bufferViews.entries()) bufferViewBytes(bytes, jsonLength, bufferView, `bufferViews[${index}]`);
  const accessorType = (index: number): string => accessors[requireIndex(index, accessors.length, "accessor")]?.type ?? "";
  for (const [index, accessor] of accessors.entries()) {
    if (accessor.sparse !== undefined) throw new Error(`GLB_SPARSE_ACCESSOR_UNSUPPORTED: accessors[${index}]`);
    if (!Number.isSafeInteger(accessor.count) || accessor.count < 0 || (accessor.byteOffset ?? 0) < 0) throw new Error(`accessors[${index}] is invalid`);
    if (accessor.bufferView !== undefined) {
      const bytesForAccessor = bufferViewBytes(bytes, jsonLength, bufferViews[requireIndex(accessor.bufferView, bufferViews.length, `accessors[${index}]`)], `accessors[${index}]`);
      const componentBytes = accessor.componentType === 5126 || accessor.componentType === 5125 ? 4 : accessor.componentType === 5123 ? 2 : 1;
      const width = accessor.type === "SCALAR" ? 1 : accessor.type === "VEC2" ? 2 : accessor.type === "VEC3" ? 3 : accessor.type === "VEC4" ? 4 : accessor.type === "MAT4" ? 16 : 0;
      if (width === 0 || (accessor.byteOffset ?? 0) + accessor.count * width * componentBytes > bytesForAccessor.byteLength) throw new Error(`accessors[${index}] exceeds bufferView`);
    }
  }
  const images = (document.images ?? []).map((image, index) => {
    if (image.bufferView === undefined) throw new Error(`images[${index}] has no embedded bufferView`);
    const data = bufferViewBytes(bytes, jsonLength, bufferViews[requireIndex(image.bufferView, bufferViews.length, `images[${index}]`)], `images[${index}]`);
    return { name: image.name, blenderId: recordId(image.extras), mimeType: image.mimeType, byteLength: data.byteLength, signature: Array.from(data.subarray(0, 8)) };
  });
  const meshes = (document.meshes ?? []).map((mesh, index) => {
    const primitives = mesh.primitives ?? [];
    const attributes = new Set<string>();
    let morphTargetCount = 0;
    for (const [primitiveIndex, primitive] of primitives.entries()) {
      for (const semantic of Object.keys(primitive.attributes ?? {})) {
        const accessor = requireIndex(primitive.attributes?.[semantic], accessors.length, `meshes[${index}].primitives[${primitiveIndex}].${semantic}`);
        accessorType(accessor);
        attributes.add(semantic);
      }
      if (primitive.indices !== undefined) accessorType(requireIndex(primitive.indices, accessors.length, "primitive indices"));
      morphTargetCount = Math.max(morphTargetCount, primitive.targets?.length ?? 0);
    }
    return { name: mesh.name, blenderId: recordId(mesh.extras), primitiveCount: primitives.length, attributes: [...attributes].sort(), morphTargetCount };
  });
  const skins = (document.skins ?? []).map((skin, index) => {
    const jointCount = skin.joints?.length ?? 0;
    if (jointCount === 0) throw new Error(`skins[${index}] has no joints`);
    let inverseBindType: string | undefined;
    let inverseBindCount: number | undefined;
    if (skin.inverseBindMatrices !== undefined) {
      const accessor = accessors[requireIndex(skin.inverseBindMatrices, accessors.length, `skins[${index}].inverseBindMatrices`)]!;
      inverseBindType = accessor.type;
      inverseBindCount = accessor.count;
      if (inverseBindType !== "MAT4" || inverseBindCount !== jointCount) throw new Error(`skins[${index}] inverse bind matrices do not match joints`);
    }
    return { jointCount, inverseBindType, inverseBindCount };
  });
  const animations = document.animations ?? [];
  const animationPaths = animations.flatMap((animation) => (animation.channels ?? []).map((channel) => channel.target?.path ?? "")).filter(Boolean).sort();
  return { version: 2, meshCount: meshes.length, primitiveCount: meshes.reduce((sum, mesh) => sum + mesh.primitiveCount, 0), meshes, images, skinCount: skins.length, skins, animationCount: animations.length, animationChannelCount: animationPaths.length, animationPaths };
}

function desktopAccessorSemantics(accessors: readonly GLBAccessor[], index: number | undefined, label: string): GLBDesktopAccessorSemantics | null {
  if (index === undefined) return null;
  const accessor = accessors[requireIndex(index, accessors.length, label)]!;
  return {
    componentType: accessor.componentType,
    count: accessor.count,
    type: accessor.type,
    normalized: accessor.normalized === true,
    min: accessor.min ?? null,
    max: accessor.max ?? null,
  };
}

/**
 * Imports the canonical, bounded semantic surface used by the M12 desktop GLB
 * fixtures. This intentionally does not create Blender Main data; that writer
 * and its stable-ID persistence gate belong to M12-06C.
 */
export function importGLBDesktopFixtureSemantics(glb: ArrayBuffer): GLBDesktopFixtureSemantics {
  importGLBSemantics(glb);
  const bytes = new Uint8Array(glb);
  const jsonLength = new DataView(glb).getUint32(12, true);
  const document = jsonChunk(bytes, glb.byteLength);
  const accessors = document.accessors ?? [];
  const meshes = document.meshes ?? [];
  const materials = document.materials ?? [];
  const nodes = document.nodes ?? [];
  const textures = document.textures ?? [];
  const images = document.images ?? [];
  const samplers = document.samplers ?? [];
  const skins = document.skins ?? [];
  const animations = document.animations ?? [];

  if (document.scene !== undefined) requireIndex(document.scene, document.scenes?.length ?? 0, "scene");
  for (const [index, node] of nodes.entries()) {
    if (node.mesh !== undefined) requireIndex(node.mesh, meshes.length, `nodes[${index}].mesh`);
    if (node.skin !== undefined) requireIndex(node.skin, skins.length, `nodes[${index}].skin`);
    for (const child of node.children ?? []) requireIndex(child, nodes.length, `nodes[${index}].children`);
  }
  for (const [index, texture] of textures.entries()) {
    if (texture.source !== undefined) requireIndex(texture.source, images.length, `textures[${index}].source`);
    if (texture.sampler !== undefined) requireIndex(texture.sampler, samplers.length, `textures[${index}].sampler`);
  }

  const importedMeshes = meshes.map((mesh, meshIndex) => ({
    name: mesh.name ?? null,
    primitives: (mesh.primitives ?? []).map((primitive, primitiveIndex) => {
      if (primitive.material !== undefined) requireIndex(primitive.material, materials.length, `meshes[${meshIndex}].primitives[${primitiveIndex}].material`);
      const attributes: Record<string, GLBDesktopAccessorSemantics> = {};
      for (const [name, accessor] of Object.entries(primitive.attributes ?? {}).sort(([left], [right]) => left.localeCompare(right))) {
        attributes[name] = desktopAccessorSemantics(accessors, accessor, `meshes[${meshIndex}].primitives[${primitiveIndex}].attributes.${name}`)!;
      }
      return {
        attributes,
        indices: desktopAccessorSemantics(accessors, primitive.indices, `meshes[${meshIndex}].primitives[${primitiveIndex}].indices`),
        material: primitive.material ?? null,
        mode: primitive.mode ?? 4,
        targets: (primitive.targets ?? []).map((target, targetIndex) => {
          const imported: Record<string, GLBDesktopAccessorSemantics> = {};
          for (const [name, accessor] of Object.entries(target).sort(([left], [right]) => left.localeCompare(right))) {
            imported[name] = desktopAccessorSemantics(accessors, accessor, `meshes[${meshIndex}].primitives[${primitiveIndex}].targets[${targetIndex}].${name}`)!;
          }
          return imported;
        }),
      };
    }),
  }));

  const importedSkins = skins.map((skin, skinIndex) => {
    const joints = skin.joints ?? [];
    for (const joint of joints) requireIndex(joint, nodes.length, `skins[${skinIndex}].joints`);
    if (skin.skeleton !== undefined) requireIndex(skin.skeleton, nodes.length, `skins[${skinIndex}].skeleton`);
    return {
      name: skin.name ?? null,
      joints,
      inverseBindMatrices: desktopAccessorSemantics(accessors, skin.inverseBindMatrices, `skins[${skinIndex}].inverseBindMatrices`),
      skeleton: skin.skeleton ?? null,
    };
  });

  const importedAnimations = animations.map((animation, animationIndex) => {
    const animationSamplers = animation.samplers ?? [];
    return {
      name: animation.name ?? null,
      samplers: animationSamplers.map((sampler, samplerIndex) => ({
        interpolation: sampler.interpolation ?? "LINEAR",
        input: desktopAccessorSemantics(accessors, sampler.input, `animations[${animationIndex}].samplers[${samplerIndex}].input`),
        output: desktopAccessorSemantics(accessors, sampler.output, `animations[${animationIndex}].samplers[${samplerIndex}].output`),
      })),
      channels: (animation.channels ?? []).map((channel, channelIndex) => {
        const sampler = requireIndex(channel.sampler, animationSamplers.length, `animations[${animationIndex}].channels[${channelIndex}].sampler`);
        const node = requireIndex(channel.target?.node, nodes.length, `animations[${animationIndex}].channels[${channelIndex}].target.node`);
        const path = channel.target?.path;
        if (path !== "translation" && path !== "rotation" && path !== "scale" && path !== "weights") throw new Error(`animations[${animationIndex}].channels[${channelIndex}].target.path is invalid`);
        return { sampler, target: { node, path } };
      }),
    };
  });

  return {
    asset: document.asset ?? null,
    extensionsUsed: [...(document.extensionsUsed ?? [])].sort(),
    extensionsRequired: [...(document.extensionsRequired ?? [])].sort(),
    scene: document.scene ?? null,
    nodeNames: nodes.map((node) => node.name ?? null),
    nodes: nodes.map((node) => ({
      name: node.name ?? null,
      mesh: node.mesh ?? null,
      skin: node.skin ?? null,
      children: node.children ?? [],
      translation: node.translation ?? null,
      rotation: node.rotation ?? null,
      scale: node.scale ?? null,
    })),
    meshes: importedMeshes,
    materials: materials.map((material) => {
      const pbr = material.pbrMetallicRoughness ?? {};
      return {
        name: material.name ?? null,
        alphaMode: material.alphaMode ?? "OPAQUE",
        doubleSided: material.doubleSided === true,
        pbr: {
          baseColorFactor: pbr.baseColorFactor ?? null,
          baseColorTexture: pbr.baseColorTexture ?? null,
          metallicFactor: pbr.metallicFactor ?? null,
          roughnessFactor: pbr.roughnessFactor ?? null,
        },
        normalTexture: material.normalTexture ?? null,
        emissiveFactor: material.emissiveFactor ?? null,
      };
    }),
    textures: textures.map((texture) => ({ ...texture })),
    images: images.map((image) => ({ ...image })),
    samplers: samplers.map((sampler) => ({ ...sampler })),
    skins: importedSkins,
    animations: importedAnimations,
  };
}

function semanticMismatches(expected: unknown, actual: unknown, path: string, mismatches: string[]): void {
  if (Object.is(expected, actual)) return;
  if (Array.isArray(expected) || Array.isArray(actual)) {
    if (!Array.isArray(expected) || !Array.isArray(actual)) {
      mismatches.push(`${path}: expected ${JSON.stringify(expected)} got ${JSON.stringify(actual)}`);
      return;
    }
    if (expected.length !== actual.length) mismatches.push(`${path}.length: expected ${expected.length} got ${actual.length}`);
    for (let index = 0; index < Math.min(expected.length, actual.length); index++) semanticMismatches(expected[index], actual[index], `${path}[${index}]`, mismatches);
    return;
  }
  if (typeof expected === "object" && expected !== null && typeof actual === "object" && actual !== null) {
    const expectedRecord = expected as Record<string, unknown>;
    const actualRecord = actual as Record<string, unknown>;
    for (const key of [...new Set([...Object.keys(expectedRecord), ...Object.keys(actualRecord)])].sort()) {
      semanticMismatches(expectedRecord[key], actualRecord[key], `${path}.${key}`, mismatches);
    }
    return;
  }
  mismatches.push(`${path}: expected ${JSON.stringify(expected)} got ${JSON.stringify(actual)}`);
}

export function compareGLBDesktopFixtureSemantics(expected: unknown, actual: GLBDesktopFixtureSemantics): GLBSemanticComparison {
  const mismatches: string[] = [];
  semanticMismatches(expected, actual, "$", mismatches);
  return { compatible: mismatches.length === 0, mismatches };
}

export function compareGLBToSceneIR(snapshot: SceneSnapshotIR, imported: ImportedGLBSemantics, assetBuffers: readonly GLBAssetBuffer[] = []): GLBSemanticComparison {
  const mismatches: string[] = [];
  const geometryMeshIds = new Set(snapshot.meshes.filter((mesh) => mesh.geometryStatus !== "summary-only").map((mesh) => mesh.id));
  const importedMeshIds = new Set(imported.meshes.map((mesh) => mesh.blenderId).filter((id): id is string => Boolean(id)));
  for (const id of geometryMeshIds) if (!importedMeshIds.has(id)) mismatches.push(`mesh missing: ${id}`);
  const expectedImages = assetBuffers.filter((asset) => snapshot.images.some((image) => image.assetId === asset.assetId && asset.data.byteLength > 0));
  if (imported.images.length !== expectedImages.length) mismatches.push(`image count ${imported.images.length} != ${expectedImages.length}`);
  for (const asset of expectedImages) {
    const image = imported.images.find((candidate) => candidate.blenderId === snapshot.images.find((source) => source.assetId === asset.assetId)?.id);
    if (!image || image.byteLength !== asset.data.byteLength || image.mimeType !== asset.mimeType) mismatches.push(`image semantic mismatch: ${asset.assetId}`);
  }
  const expectedSkins = snapshot.meshes.filter((mesh) => mesh.skinWeights?.armatureId && snapshot.armatures?.some((armature) => armature.id === mesh.skinWeights?.armatureId));
  if (imported.skinCount !== expectedSkins.length) mismatches.push(`skin count ${imported.skinCount} != ${expectedSkins.length}`);
  for (const mesh of expectedSkins) {
    const expectedJoints = mesh.skinWeights?.jointIds?.length ?? 0;
    if (!imported.skins.some((skin) => skin.jointCount === expectedJoints && skin.inverseBindType === "MAT4")) mismatches.push(`skin semantic mismatch: ${mesh.id}`);
  }
  const expectedMorphs = snapshot.meshes.filter((mesh) => (mesh.shapeKeys?.length ?? 0) > 0).reduce((sum, mesh) => sum + (mesh.shapeKeys?.length ?? 0), 0);
  const importedMorphs = imported.meshes.reduce((sum, mesh) => sum + mesh.morphTargetCount, 0);
  if (importedMorphs !== expectedMorphs) mismatches.push(`morph target count ${importedMorphs} != ${expectedMorphs}`);
  const expectedAnimationPaths: string[] = [];
  let expectedAnimations = 0;
  for (const animation of snapshot.animations) {
    const groups = new Set<string>();
    for (const channel of animation.channels) {
      const boneMatch = channel.path.match(/^pose\.bones\["(.+)"\]\.(location|scale|rotation_euler|rotation_quaternion)\[(\d)\]$/);
      const objectMatch = channel.path.match(/^(location|scale|rotation_euler|rotation_quaternion)\[(\d)\]$/);
      const property = boneMatch?.[2] ?? objectMatch?.[1];
      if (!property || channel.keyframes.length === 0) continue;
      if (boneMatch) {
        const armature = (snapshot.armatures ?? []).find((candidate) => candidate.objectId === animation.targetId);
        if (!armature?.bones.some((bone) => bone.name === boneMatch[1])) continue;
      }
      else if (!snapshot.nodes.some((node) => node.id === animation.targetId)) continue;
      const path = property === "location" ? "translation" : property === "scale" ? "scale" : "rotation";
      groups.add(`${boneMatch?.[1] ?? animation.targetId}:${path}`);
    }
    if (groups.size > 0) expectedAnimations++;
    for (const group of groups) expectedAnimationPaths.push(group.slice(group.lastIndexOf(":") + 1));
  }
  expectedAnimationPaths.sort();
  if (imported.animationCount !== expectedAnimations) mismatches.push(`animation count ${imported.animationCount} != ${expectedAnimations}`);
  if (imported.animationPaths.join(",") !== expectedAnimationPaths.join(",")) mismatches.push(`animation paths ${imported.animationPaths.join(",")} != ${expectedAnimationPaths.join(",")}`);
  return { compatible: mismatches.length === 0, mismatches };
}