/**
 * End-to-end integration pipeline for Imhotep.
 *
 * Orchestrates the full evaluation flow:
 *   Execution IR → Extraction Plan → Browser Facts → Geometry World
 *   → Topology Derivation → Clause Evaluation → Proof Generation
 *   → Witness Shrinking → Diagnostic Formatting
 *
 * All stage implementations are injected via PipelineConfig so the
 * pipeline remains testable and backend-agnostic.
 */

// Local type aliases for cross-package contracts (avoids circular project references)
interface ExecutionContext {
  executionIr: {
    clauseCount: number
    clauseType: number[]
    clauseSubject: number[]
    clauseReference: number[]
    clauseFrame: number[]
    clauseArg0: number[]
    clauseArg1: number[]
    clauseFlags: number[]
    clauseState: number[]
    clauseTimeline: number[]
    clauseEnvGuard: number[]
    clauseTolerance: number[]
  }
  stateIds: string[]
  timelineIds: string[]
  envGuardIds: string[]
  toleranceIds: string[]
}

interface ExtractionPlanner {
  createPlan(context: ExecutionContext): ExtractionPlan
}

interface ExtractionPlan {
  batches: Array<{ requests: ExtractionRequest[] }>
  diagnostics: Array<{ code: string; severity: string; message: string; category?: string }>
}

interface ExtractionRequest {
  requestId: string
  envCaseId: string
  subjects: Array<{ selector: string }>
  stateSnapshots: Array<{ id: string; kind: string }>
}

interface EvaluationOutput {
  clauseResults: ClauseResult[]
  groupResults: GroupResult[]
  proofs: Proof[]
  diagnostics: Array<{ code: string; severity: string; category: string; message: string; clauseId?: string }>
  trace: Array<{ phase: string; at: number; clauseId?: string }>
}

interface ClauseDescriptor {
  clauseId: string
  clauseKind: string
  version: number
  subjectRef?: number
  referenceRef?: number
  frameRef?: number
  stateRef?: string
  timelineRef?: string
  envGuardRef?: string
  toleranceRef?: string
  bounds?: Record<string, number>
  options?: Record<string, unknown>
}

interface Witness {
  proof: {
    proofId: string
    clauseId: string
    outcome: 'pass' | 'fail'
    truth: string
    failedPredicate?: unknown
    witness?: unknown
  }
  envCases: string[]
  snapshots: string[]
  subjects: number[]
  facts?: unknown
}

interface ShrinkResult {
  reduced: boolean
  axes: string[]
}

import type {
  ImhotepId,
  Proof,
  ClauseResult,
  GroupResult,
  Environment,
} from './types.js'

import type {
  Diagnostic,
  TraceEvent,
  EvaluationTrace,
} from './diagnostics.js'

import { createDiagnostic } from './diagnostics.js'

// Adapter interfaces - implementations injected at runtime
interface ExtractorRequest {
  requestId: string
  sceneTarget: { pageRef: string; url?: string }
  env: Environment
  statePlan: { snapshots: string[] }
  timelinePlan: { mode: string }
  subjects: Array<{ id: string; selector: string }>
  requiredFacts: Record<string, unknown>
}

interface ExtractorResponse {
  requestId: string
  status: 'ok' | 'partial' | 'error'
  snapshots: GeometryWorldSnapshot[]
  diagnostics: Diagnostic[]
  extractionTrace?: unknown
}

interface CDPSource {
  url: string
  browserName: string
  browserVersion: string
  extractedAt: string | number
}

interface CDPDomNode {
  nodeId: number
  backendNodeId: number
  parentNodeId: number
  firstChildIndex: number
  childCount: number
  shadowRootKind: string
  tagNameStringId: number
  roleStringId: number
  ariaNameStringId: number
}

interface CDPSubjects {
  ids: number[]
  domNodeId: number[]
  subjectKind: number[]
  primaryBoxId: number[]
  firstFragmentId: number[]
  fragmentCount: number[]
  firstTextRunId: number[]
  textRunCount: number[]
}

interface CDPFrames {
  frameId: number[]
  frameKind: number[]
  ownerSubjectId: number[]
  parentFrameId: number[]
  originX: number[]
  originY: number[]
  axisMatrixStart: number[]
  clipRectId: number[]
  scrollContainerId: number[]
  writingMode: number[]
}

interface CDPMatrices {
  values: number[]
}

interface CDPRects {
  rectId: number[]
  left: number[]
  top: number[]
  right: number[]
  bottom: number[]
}

interface CDPBoxes {
  boxId: number[]
  subjectId: number[]
  frameId: number[]
  borderLeft: number[]
  borderTop: number[]
  borderRight: number[]
  borderBottom: number[]
  paddingLeft: number[]
  paddingTop: number[]
  paddingRight: number[]
  paddingBottom: number[]
  contentLeft: number[]
  contentTop: number[]
  contentRight: number[]
  contentBottom: number[]
}

interface CDPFragments {
  fragmentId: number[]
  subjectId: number[]
  fragmentKind: number[]
  boxLeft: number[]
  boxTop: number[]
  boxRight: number[]
  boxBottom: number[]
  lineIndex: number[]
  flowIndex: number[]
  parentFragmentId: number[]
}

interface CDPTransforms {
  transformId: number[]
  subjectId: number[]
  matrixStart: number[]
  matrixLength: number[]
  originX: number[]
  originY: number[]
}

interface CDPStyles {
  subjectId: number[]
  display: number[]
  position: number[]
  zIndexKind: number[]
  zIndexValue: number[]
  overflowX: number[]
  overflowY: number[]
  opacity: number[]
  visibility: number[]
  containFlags: number[]
  pointerEvents: number[]
  lineHeight: number[]
  fontFamilyStringId: number[]
  fontSize: number[]
  fontWeight: number[]
}

interface CDPTopology {
  containingBlockOf: number[]
  nearestPositionedAncestorOf: number[]
  scrollContainerOf: number[]
  stackingContextOf: number[]
  formattingContextOf: number[]
  clippingRootOf: number[]
  paintOrderBucket: number[]
  paintOrderIndex: number[]
}

interface CDPScrollEntry {
  containerId: number
  scrollLeft: number
  scrollTop: number
  scrollWidth: number
  scrollHeight: number
  clientWidth: number
  clientHeight: number
}

interface CDPClippingEntry {
  clipNodeId: number
  subjectId: number
  clipKind: number
  clipLeft: number
  clipTop: number
  clipRight: number
  clipBottom: number
  parentClipNodeId: number
}

interface CDPProvenanceEntry {
  factId: number
  extractionStepId: number
  sourceKind: number
  sourceRef: number
}

interface CDPConfidenceEntry {
  factId: number
  confidence: number
  reasonCode: number
}

interface GeometryWorldSnapshot {
  sceneId: string
  snapshotId: string
  env: Environment
  source: CDPSource
  strings: StringTable
  subjects: CDPSubjects
  dom: { nodes: CDPDomNode[] }
  frames: CDPFrames
  matrices: CDPMatrices
  rects: CDPRects
  boxes: CDPBoxes
  fragments: CDPFragments
  transforms: CDPTransforms
  styles: CDPStyles
  text: unknown
  topology: CDPTopology
  scroll: CDPScrollEntry[]
  clipping: CDPClippingEntry[]
  paint: unknown
  visibility: unknown
  provenance: CDPProvenanceEntry[]
  confidence: CDPConfidenceEntry[]
}

import type {
  GeometryWorld,
  StringTable,
  WorldEnvironment,
  WorldSource,
  SubjectsTable,
  DomTable,
  FramesTable,
  MatricesTable,
  RectsTable,
  BoxesTable,
  FragmentsTable,
  TransformsTable,
  StylesTable,
  TextTable,
  TopologyTable,
  ScrollTable,
  ClippingTable,
  PaintTable,
  VisibilityTable,
  ProvenanceTable,
  ConfidenceTable,
} from './world.js'

// ---------------------------------------------------------------------------
// Adapter Interfaces (Dependency Injection)
// ---------------------------------------------------------------------------

/**
 * Adapts the CDP extractor to the pipeline.
 * Receives a planner request and runtime handle, returns raw extraction response.
 */
export interface PipelineExtractorAdapter<TRuntime = unknown> {
  extract(runtime: TRuntime, request: ExtractionRequest): Promise<ExtractorResponse>
}

/**
 * Converts a CDP geometry world snapshot into the canonical core GeometryWorld.
 */
export interface NormalizerAdapter {
  normalize(snapshot: GeometryWorldSnapshot): GeometryWorld
}

/**
 * Derives additional topology facts from a geometry world.
 * Optional: if omitted, topology from extraction is used as-is.
 */
export interface TopologyAdapter {
  derive(world: GeometryWorld): GeometryWorld
}

/**
 * Evaluates clauses against a geometry world.
 */
export interface SolverAdapter {
  evaluate(world: GeometryWorld, clauses: ClauseDescriptor[]): EvaluationOutput
}

/**
 * Shrinks failing witnesses and formats diagnostics.
 */
export interface ReporterAdapter {
  shrinkWitness(witness: Witness, stillFails: (w: Witness) => boolean): ShrinkResult
  formatDiagnostics(evaluation: EvaluationOutput, proofs: Proof[]): Diagnostic[]
}

/**
 * Materializes UI states (hover, focus, etc.) on the runtime before extraction.
 * Optional: if omitted, only default state is captured.
 */
export interface StateMaterializerAdapter<TRuntime = unknown> {
  materialize(runtime: TRuntime, stateKind: string, selector: string): Promise<void>
}

// ---------------------------------------------------------------------------
// Pipeline Configuration and Input
// ---------------------------------------------------------------------------

export interface PipelineConfig<TRuntime = unknown> {
  planner: ExtractionPlanner
  extractor: PipelineExtractorAdapter<TRuntime>
  normalizer: NormalizerAdapter
  topologyDeriver?: TopologyAdapter
  solver: SolverAdapter
  reporter: ReporterAdapter
  stateMaterializer?: StateMaterializerAdapter<TRuntime>
}

export interface PipelineInput<TRuntime = unknown> {
  executionContext: ExecutionContext
  runtime: TRuntime
}

// ---------------------------------------------------------------------------
// Pipeline Output
// ---------------------------------------------------------------------------

export interface WorldEntry {
  world: GeometryWorld
  envCaseId: string
  snapshotId: string
  requestId: string
  extractionStatus: 'ok' | 'partial' | 'error'
  extractionDiagnostics: Diagnostic[]
}

export interface PipelineResult {
  plan: ExtractionPlan
  worlds: WorldEntry[]
  clauseResults: ClauseResult[]
  groupResults: ClauseResult[]
  proofs: Proof[]
  shrunkWitnesses: ShrinkResult[]
  diagnostics: Diagnostic[]
  status: 'pass' | 'fail' | 'error' | 'partial'
  trace: EvaluationTrace
}

// ---------------------------------------------------------------------------
// Clause Kind Mapping
// ---------------------------------------------------------------------------

/**
 * Reverse mapping from execution IR clause type codes to solver clause kinds.
 * Mirrors the relationCodes table in imhotep-dsl/compiler.ts.
 */
const CODE_TO_CLAUSE_KIND: Record<number, string> = {
  1: 'relation.leftOf',
  2: 'relation.rightOf',
  3: 'relation.above',
  4: 'relation.below',
  5: 'alignment.alignedWith',
  6: 'alignment.leftAlignedWith',
  7: 'alignment.rightAlignedWith',
  8: 'alignment.topAlignedWith',
  9: 'alignment.bottomAlignedWith',
  10: 'alignment.centeredWithin',
  11: 'relation.inside',
  12: 'relation.contains',
  13: 'relation.overlaps',
  14: 'relation.separatedFrom',
  15: 'size.aspectRatio',
}

// ---------------------------------------------------------------------------
// Main Pipeline Orchestrator
// ---------------------------------------------------------------------------

let _traceId = 0
function nextTraceId(): string {
  return `trace_${++_traceId}`
}

function now(): number {
  return Date.now()
}

/**
 * Run the full Imhotep evaluation pipeline.
 *
 * Steps:
 *   1. Plan extraction requirements from execution context.
 *   2. For each request: materialize states, extract, normalize, derive topology.
 *   3. Convert execution IR to clause descriptors.
 *   4. Evaluate clauses against every captured world.
 *   5. Generate proofs.
 *   6. Shrink failing witnesses.
 *   7. Format diagnostics.
 *   8. Aggregate status and return structured result.
 */
export async function runPipeline<TRuntime>(
  input: PipelineInput<TRuntime>,
  config: PipelineConfig<TRuntime>,
): Promise<PipelineResult> {
  const traceEvents: TraceEvent[] = []
  const allDiagnostics: Diagnostic[] = []

  function trace(phase: TraceEvent['phase'], refs: TraceEvent['refs'], payload: Record<string, unknown> = {}): void {
    traceEvents.push({
      traceEventId: nextTraceId(),
      phase,
      at: now(),
      refs,
      payload,
    })
  }

  // --- Step 1: Plan extraction ---
  trace('fact-requirements-computed', {})
  const plan = config.planner.createPlan(input.executionContext)
  allDiagnostics.push(...plan.diagnostics.map((d: { code: string; severity: string; message: string; category?: string }) => plannerDiagnosticToCore(d)))

  // --- Step 2: Extract worlds ---
  trace('extraction-started', {})
  const worlds: WorldEntry[] = []

  for (const batch of plan.batches) {
    for (const request of batch.requests) {
      // For each state snapshot in the request, materialize and extract.
      // If no state snapshots, extract once in default state.
      const snapshots = request.stateSnapshots.length > 0
        ? request.stateSnapshots
        : [{ id: 'default', kind: 'default' }]

      for (const stateSnap of snapshots) {
        try {
          // Materialize state if adapter provided and not default
          if (config.stateMaterializer && stateSnap.kind !== 'default') {
            for (const subject of request.subjects) {
              await config.stateMaterializer.materialize(input.runtime, stateSnap.kind, subject.selector)
            }
          }

          // Extract facts
          const response = await config.extractor.extract(input.runtime, request)

          // Normalize to geometry world
          const world = config.normalizer.normalize(response.snapshots[0])

          // Derive topology if adapter provided
          const finalWorld = config.topologyDeriver
            ? config.topologyDeriver.derive(world)
            : world

          worlds.push({
            world: finalWorld,
            envCaseId: request.envCaseId,
            snapshotId: stateSnap.id,
            requestId: request.requestId,
            extractionStatus: response.status,
            extractionDiagnostics: response.diagnostics.map((d: any) => cdpDiagnosticToCore(d, request.requestId)),
          })

          trace('extraction-step-completed', {
            snapshotId: stateSnap.id,
          }, {
            requestId: request.requestId,
            status: response.status,
            diagnosticCount: response.diagnostics.length,
          })

          // Surface extraction diagnostics
          allDiagnostics.push(...worlds[worlds.length - 1].extractionDiagnostics)

          // Surface partial extraction as indeterminate diagnostic
          if (response.status === 'partial') {
            allDiagnostics.push(createDiagnostic(
              'IMH_EXTRACT_PARTIAL',
              'extraction-error',
              'warning',
              `Partial extraction for request ${request.requestId}; some facts may be missing.`,
              {
                source: 'imhotep-pipeline',
                envCaseId: request.envCaseId,
                snapshotId: stateSnap.id,
              },
            ))
          }
        } catch (err) {
          const message = err instanceof Error ? err.message : String(err)
          allDiagnostics.push(createDiagnostic(
            'IMH_EXTRACT_PROTOCOL_ERROR',
            'extraction-error',
            'error',
            `Extraction failed for request ${request.requestId}: ${message}`,
            {
              source: 'imhotep-pipeline',
              envCaseId: request.envCaseId,
              snapshotId: stateSnap.id,
            },
          ))

          // Push an empty world so downstream stages can still run
          worlds.push({
            world: createEmptyWorld(request.requestId, stateSnap.id),
            envCaseId: request.envCaseId,
            snapshotId: stateSnap.id,
            requestId: request.requestId,
            extractionStatus: 'error',
            extractionDiagnostics: [],
          })
        }
      }
    }
  }

  // --- Step 3: Convert Execution IR to Clause Descriptors ---
  const clauses = executionIrToClauseDescriptors(input.executionContext)

  // --- Step 4: Evaluate clauses against all worlds ---
  trace('world-normalized', {})
  const allClauseResults: ClauseResult[] = []
  const allGroupResults: ClauseResult[] = []
  const allProofs: Proof[] = []

  for (const entry of worlds) {
    if (entry.extractionStatus === 'error') {
      // Emit indeterminate results for all clauses when extraction failed
      for (const clause of clauses) {
        allClauseResults.push({
          clauseId: clause.clauseId,
          status: 'error',
          truth: 'indeterminate',
          metrics: {},
          witness: {
            subjectId: clause.subjectRef ?? 0,
            referenceId: clause.referenceRef,
            frameId: clause.frameRef ?? 0,
            envCaseId: entry.envCaseId,
            snapshotId: entry.snapshotId,
          },
          diagnostics: [],
        })
      }
      continue
    }

    const evaluation = config.solver.evaluate(entry.world, clauses)

    // Cast across package type boundaries (solver uses slightly different ClauseResult/Proof shapes)
    allClauseResults.push(...(evaluation.clauseResults as any))
    allGroupResults.push(...(evaluation.groupResults as any))
    allProofs.push(...(evaluation.proofs as any))

    for (const cr of evaluation.clauseResults) {
      trace('clause-evaluated', { clauseId: cr.clauseId }, {
        status: cr.status,
        truth: cr.truth,
        envCaseId: entry.envCaseId,
        snapshotId: entry.snapshotId,
      })
    }

    for (const proof of evaluation.proofs) {
      trace('proof-created', { proofId: proof.proofId, clauseId: proof.clauseId })
    }

    // Surface solver diagnostics
    allDiagnostics.push(...evaluation.diagnostics.map(d => solverDiagnosticToCore(d)))
  }

  // --- Step 5: Shrink failing witnesses ---
  const failingProofs = allProofs.filter(p => p.outcome === 'fail')
  const shrunkWitnesses: ShrinkResult[] = []

  for (const proof of failingProofs) {
    try {
      const witness: Witness = {
        proof: {
          proofId: proof.proofId,
          clauseId: proof.clauseId,
          outcome: proof.outcome as 'pass' | 'fail',
          truth: proof.truth,
          failedPredicate: proof.failedPredicate,
          witness: proof.witness,
        },
        envCases: worlds.map(w => w.envCaseId),
        snapshots: worlds.map(w => w.snapshotId),
        subjects: Array.from(new Set(clauses.map(c => c.subjectRef).filter((s): s is number => s !== undefined))),
        facts: proof.usedFacts,
      }

      // Build a real re-evaluation oracle: re-run the failing clause against
      // every remaining world in the shrunk witness.  Only accept the shrink
      // if the clause still fails somewhere.
      const shrinkOracle = (w: Witness): boolean => {
        const remainingWorlds = worlds.filter(world =>
          w.envCases.includes(world.envCaseId) && w.snapshots.includes(world.snapshotId)
        )
        if (remainingWorlds.length === 0) {
          return false
        }
        const clause = clauses.find(c => c.clauseId === proof.clauseId)
        if (!clause) {
          return false
        }
        for (const worldEntry of remainingWorlds) {
          if (worldEntry.extractionStatus === 'error') {
            continue
          }
          try {
            const evaluation = config.solver.evaluate(worldEntry.world, [clause])
            const result = evaluation.clauseResults.find(r => r.clauseId === proof.clauseId)
            if (result && result.status === 'fail') {
              return true
            }
          } catch {
            return false
          }
        }
        return false
      }

      const shrinkResult = config.reporter.shrinkWitness(witness, shrinkOracle)
      shrunkWitnesses.push(shrinkResult)

      trace('witness-shrunk', { proofId: proof.proofId }, {
        reduced: shrinkResult.reduced,
        axes: shrinkResult.axes,
      })
    } catch (err) {
      const message = err instanceof Error ? err.message : String(err)
      allDiagnostics.push(createDiagnostic(
        'IMH_INTERNAL_EVALUATION_EXCEPTION',
        'internal-error',
        'warning',
        `Witness shrinking failed for proof ${proof.proofId}: ${message}`,
        {
          source: 'imhotep-pipeline',
          clauseId: proof.clauseId,
        },
      ))
    }
  }

  // --- Step 6: Format diagnostics ---
  const evaluationOutput: EvaluationOutput = {
    clauseResults: allClauseResults as any,
    groupResults: allGroupResults as any,
    proofs: allProofs as any,
    diagnostics: allDiagnostics.map(d => coreDiagnosticToSolver(d)),
    trace: traceEvents.map(t => ({
      phase: t.phase,
      at: t.at,
      clauseId: t.refs.clauseId,
    })),
  }

  const formattedDiagnostics = config.reporter.formatDiagnostics(evaluationOutput, allProofs)
  allDiagnostics.push(...formattedDiagnostics)

  for (const d of formattedDiagnostics) {
    trace('diagnostic-emitted', {}, {
      code: d.code,
      severity: d.severity,
      message: d.message,
    })
  }

  // --- Step 7: Aggregate status ---
  const hasErrors = allClauseResults.some(r => r.status === 'error')
  const hasFails = allClauseResults.some(r => r.status === 'fail')
  const hasPartial = worlds.some(w => w.extractionStatus === 'partial')

  let status: PipelineResult['status']
  if (hasErrors) {
    status = 'error'
  } else if (hasFails) {
    status = 'fail'
  } else if (hasPartial) {
    status = 'partial'
  } else {
    status = 'pass'
  }

  return {
    plan,
    worlds,
    clauseResults: allClauseResults,
    groupResults: allGroupResults,
    proofs: allProofs,
    shrunkWitnesses,
    diagnostics: allDiagnostics,
    status,
    trace: { events: traceEvents },
  }
}

// ---------------------------------------------------------------------------
// Execution IR → Clause Descriptor Conversion
// ---------------------------------------------------------------------------

/**
 * Convert flattened execution IR into solver ClauseDescriptor objects.
 *
 * This bridges the compiler's numeric array representation with the
 * solver's object-oriented clause descriptors.
 */
export function executionIrToClauseDescriptors(context: ExecutionContext): ClauseDescriptor[] {
  const { executionIr } = context
  const clauses: ClauseDescriptor[] = []

  for (let i = 0; i < executionIr.clauseCount; i++) {
    const clauseType = executionIr.clauseType[i]
    const clauseKind = CODE_TO_CLAUSE_KIND[clauseType]

    if (!clauseKind) {
      // Unsupported clause type — emit a diagnostic-skipped descriptor
      clauses.push({
        clauseId: `clause_${i}`,
        clauseKind: 'unknown',
        version: 1,
        subjectRef: executionIr.clauseSubject[i],
        referenceRef: executionIr.clauseReference[i] || undefined,
        frameRef: executionIr.clauseFrame[i] || undefined,
        options: { unsupported: true, rawType: clauseType },
      })
      continue
    }

    // Reconstruct bounds from packed arg0/arg1
    const bounds: Record<string, number> = {}
    const arg0 = executionIr.clauseArg0[i]
    const arg1 = executionIr.clauseArg1[i]

    if (clauseKind.startsWith('relation.') || clauseKind.startsWith('alignment.')) {
      if (arg0 !== Number.NEGATIVE_INFINITY) bounds.minGap = arg0
      if (arg1 !== Number.POSITIVE_INFINITY) bounds.maxGap = arg1
    } else if (clauseKind.startsWith('size.')) {
      if (arg0 !== Number.NEGATIVE_INFINITY) bounds.min = arg0
      if (arg1 !== Number.POSITIVE_INFINITY) bounds.max = arg1
    }

    // Decode flags into options
    const flags = executionIr.clauseFlags[i]
    const options: Record<string, unknown> = {}
    if (flags & 1) options.quantifier = 'all'
    if (flags & 2) options.quantifier = 'any'
    if (flags & 4) options.quantifier = 'none'
    if (flags & 8) options.inStackingContext = true

    const subjectRef = executionIr.clauseSubject[i]
    const referenceRef = executionIr.clauseReference[i]

    clauses.push({
      clauseId: `clause_${i}`,
      clauseKind,
      version: 1,
      subjectRef: subjectRef || undefined,
      referenceRef: referenceRef || undefined,
      frameRef: executionIr.clauseFrame[i] || undefined,
      stateRef: context.stateIds[executionIr.clauseState[i]] || undefined,
      timelineRef: context.timelineIds[executionIr.clauseTimeline[i]] || undefined,
      envGuardRef: context.envGuardIds[executionIr.clauseEnvGuard[i]] || undefined,
      toleranceRef: context.toleranceIds[executionIr.clauseTolerance[i]] || undefined,
      bounds: Object.keys(bounds).length > 0 ? bounds : undefined,
      options: Object.keys(options).length > 0 ? options : undefined,
    })
  }

  return clauses
}

// ---------------------------------------------------------------------------
// CDP Snapshot → Core GeometryWorld Conversion
// ---------------------------------------------------------------------------

/**
 * Convert a CDP GeometryWorldSnapshot (plain arrays) into a core GeometryWorld
 * (typed arrays). This is the default normalizer used when no custom
 * normalizer is injected.
 */
export function convertSnapshotToWorld(snapshot: GeometryWorldSnapshot): GeometryWorld {
  const strings: StringTable = snapshot.strings

  const env: WorldEnvironment = {
    viewportWidth: snapshot.env.viewportWidth,
    viewportHeight: snapshot.env.viewportHeight,
    deviceScaleFactor: snapshot.env.deviceScaleFactor,
    colorScheme: snapshot.env.colorScheme,
    pointer: snapshot.env.pointer,
    hover: snapshot.env.hover,
    reducedMotion: snapshot.env.reducedMotion,
    locale: snapshot.env.locale,
    writingMode: snapshot.env.writingMode,
  }

  const source: WorldSource = {
    url: snapshot.source.url,
    browserName: snapshot.source.browserName,
    browserVersion: snapshot.source.browserVersion,
    engine: 'chromium-cdp',
    extractedAt: new Date(snapshot.source.extractedAt).getTime(),
  }

  // Convert DOM nodes from CDP format to core typed arrays
  const domNodes = snapshot.dom.nodes as Array<{
    nodeId: number
    backendNodeId: number
    parentNodeId: number
    firstChildIndex: number
    childCount: number
    shadowRootKind: string
    tagNameStringId: number
    roleStringId: number
    ariaNameStringId: number
  }>
  const dom: DomTable = {
    nodeId: new Uint32Array(domNodes.map((n: any) => n.nodeId)),
    backendNodeId: new Uint32Array(domNodes.map((n: any) => n.backendNodeId)),
    parentNodeId: new Uint32Array(domNodes.map((n: any) => n.parentNodeId)),
    firstChildIndex: new Uint32Array(domNodes.map((n: any) => n.firstChildIndex)),
    childCount: new Uint16Array(domNodes.map((n: any) => n.childCount)),
    shadowRootKind: new Uint8Array(domNodes.map((n: any) => {
      if (n.shadowRootKind === 'open') return 1
      if (n.shadowRootKind === 'closed') return 2
      return 0
    })),
    tagNameStringId: new Uint32Array(domNodes.map((n: any) => n.tagNameStringId)),
    roleStringId: new Uint32Array(domNodes.map((n: any) => n.roleStringId)),
    ariaNameStringId: new Uint32Array(domNodes.map((n: any) => n.ariaNameStringId)),
  }

  const subjects: SubjectsTable = {
    ids: new Uint32Array(snapshot.subjects.ids),
    domNodeId: new Uint32Array(snapshot.subjects.domNodeId),
    subjectKind: new Uint16Array(snapshot.subjects.subjectKind),
    primaryBoxId: new Uint32Array(snapshot.subjects.primaryBoxId),
    firstFragmentId: new Uint32Array(snapshot.subjects.firstFragmentId),
    fragmentCount: new Uint16Array(snapshot.subjects.fragmentCount),
    firstTextRunId: new Uint32Array(snapshot.subjects.firstTextRunId),
    textRunCount: new Uint16Array(snapshot.subjects.textRunCount),
  }

  const frames: FramesTable = {
    frameId: new Uint32Array(snapshot.frames.frameId),
    frameKind: new Uint16Array(snapshot.frames.frameKind),
    ownerSubjectId: new Uint32Array(snapshot.frames.ownerSubjectId),
    parentFrameId: new Uint32Array(snapshot.frames.parentFrameId),
    originX: new Float64Array(snapshot.frames.originX),
    originY: new Float64Array(snapshot.frames.originY),
    axisMatrixStart: new Uint32Array(snapshot.frames.axisMatrixStart),
    clipRectId: new Uint32Array(snapshot.frames.clipRectId),
    scrollContainerId: new Uint32Array(snapshot.frames.scrollContainerId),
    writingMode: new Uint16Array(snapshot.frames.writingMode),
  }

  const matrices: MatricesTable = {
    values: new Float64Array(snapshot.matrices.values),
  }

  const rects: RectsTable = {
    rectId: new Uint32Array(snapshot.rects.rectId),
    left: new Float64Array(snapshot.rects.left),
    top: new Float64Array(snapshot.rects.top),
    right: new Float64Array(snapshot.rects.right),
    bottom: new Float64Array(snapshot.rects.bottom),
  }

  const boxes: BoxesTable = {
    boxId: new Uint32Array(snapshot.boxes.boxId),
    subjectId: new Uint32Array(snapshot.boxes.subjectId),
    frameId: new Uint32Array(snapshot.boxes.frameId),
    borderLeft: new Float64Array(snapshot.boxes.borderLeft),
    borderTop: new Float64Array(snapshot.boxes.borderTop),
    borderRight: new Float64Array(snapshot.boxes.borderRight),
    borderBottom: new Float64Array(snapshot.boxes.borderBottom),
    paddingLeft: new Float64Array(snapshot.boxes.paddingLeft),
    paddingTop: new Float64Array(snapshot.boxes.paddingTop),
    paddingRight: new Float64Array(snapshot.boxes.paddingRight),
    paddingBottom: new Float64Array(snapshot.boxes.paddingBottom),
    contentLeft: new Float64Array(snapshot.boxes.contentLeft),
    contentTop: new Float64Array(snapshot.boxes.contentTop),
    contentRight: new Float64Array(snapshot.boxes.contentRight),
    contentBottom: new Float64Array(snapshot.boxes.contentBottom),
  }

  const fragments: FragmentsTable = {
    fragmentId: new Uint32Array(snapshot.fragments.fragmentId),
    subjectId: new Uint32Array(snapshot.fragments.subjectId),
    fragmentKind: new Uint16Array(snapshot.fragments.fragmentKind),
    boxLeft: new Float64Array(snapshot.fragments.boxLeft),
    boxTop: new Float64Array(snapshot.fragments.boxTop),
    boxRight: new Float64Array(snapshot.fragments.boxRight),
    boxBottom: new Float64Array(snapshot.fragments.boxBottom),
    lineIndex: new Int32Array(snapshot.fragments.lineIndex),
    flowIndex: new Int32Array(snapshot.fragments.flowIndex),
    parentFragmentId: new Uint32Array(snapshot.fragments.parentFragmentId),
  }

  const transforms: TransformsTable = {
    transformId: new Uint32Array(snapshot.transforms.transformId),
    subjectId: new Uint32Array(snapshot.transforms.subjectId),
    matrixStart: new Uint32Array(snapshot.transforms.matrixStart),
    matrixLength: new Uint16Array(snapshot.transforms.matrixLength),
    originX: new Float64Array(snapshot.transforms.originX),
    originY: new Float64Array(snapshot.transforms.originY),
  }

  const styles: StylesTable = {
    subjectId: new Uint32Array(snapshot.styles.subjectId),
    display: new Uint16Array(snapshot.styles.display),
    position: new Uint16Array(snapshot.styles.position),
    zIndexKind: new Uint8Array(snapshot.styles.zIndexKind),
    zIndexValue: new Int32Array(snapshot.styles.zIndexValue),
    overflowX: new Uint16Array(snapshot.styles.overflowX),
    overflowY: new Uint16Array(snapshot.styles.overflowY),
    opacity: new Float32Array(snapshot.styles.opacity),
    visibility: new Uint16Array(snapshot.styles.visibility),
    containFlags: new Uint32Array(snapshot.styles.containFlags),
    pointerEvents: new Uint16Array(snapshot.styles.pointerEvents),
    lineHeight: new Float64Array(snapshot.styles.lineHeight),
    fontFamilyStringId: new Uint32Array(snapshot.styles.fontFamilyStringId),
    fontSize: new Float64Array(snapshot.styles.fontSize),
    fontWeight: new Uint16Array(snapshot.styles.fontWeight),
  }

  const topology: TopologyTable = {
    containingBlockOf: new Uint32Array(snapshot.topology.containingBlockOf),
    nearestPositionedAncestorOf: new Uint32Array(snapshot.topology.nearestPositionedAncestorOf),
    scrollContainerOf: new Uint32Array(snapshot.topology.scrollContainerOf),
    stackingContextOf: new Uint32Array(snapshot.topology.stackingContextOf),
    formattingContextOf: new Uint32Array(snapshot.topology.formattingContextOf),
    clippingRootOf: new Uint32Array(snapshot.topology.clippingRootOf),
    paintOrderBucket: new Uint16Array(snapshot.topology.paintOrderBucket),
    paintOrderIndex: new Uint32Array(snapshot.topology.paintOrderIndex),
  }

  const scroll: ScrollTable = {
    containerId: new Uint32Array(snapshot.scroll.map((s: any) => s.containerId)),
    scrollLeft: new Float64Array(snapshot.scroll.map((s: any) => s.scrollLeft)),
    scrollTop: new Float64Array(snapshot.scroll.map((s: any) => s.scrollTop)),
    scrollWidth: new Float64Array(snapshot.scroll.map((s: any) => s.scrollWidth)),
    scrollHeight: new Float64Array(snapshot.scroll.map((s: any) => s.scrollHeight)),
    clientWidth: new Float64Array(snapshot.scroll.map((s: any) => s.clientWidth)),
    clientHeight: new Float64Array(snapshot.scroll.map((s: any) => s.clientHeight)),
  }

  const clipping: ClippingTable = {
    clipNodeId: new Uint32Array(snapshot.clipping.map((c: any) => c.clipNodeId)),
    subjectId: new Uint32Array(snapshot.clipping.map((c: any) => c.subjectId)),
    clipKind: new Uint16Array(snapshot.clipping.map((c: any) => c.clipKind)),
    clipLeft: new Float64Array(snapshot.clipping.map((c: any) => c.clipLeft)),
    clipTop: new Float64Array(snapshot.clipping.map((c: any) => c.clipTop)),
    clipRight: new Float64Array(snapshot.clipping.map((c: any) => c.clipRight)),
    clipBottom: new Float64Array(snapshot.clipping.map((c: any) => c.clipBottom)),
    parentClipNodeId: new Uint32Array(snapshot.clipping.map((c: any) => c.parentClipNodeId)),
  }

  // Empty tables for fields not yet provided by CDP extractor
  const text: TextTable = {
    runId: new Uint32Array(0),
    subjectId: new Uint32Array(0),
    contentStringId: new Uint32Array(0),
    lineBoxId: new Uint32Array(0),
    inkLeft: new Float64Array(0),
    inkTop: new Float64Array(0),
    inkRight: new Float64Array(0),
    inkBottom: new Float64Array(0),
    baselineY: new Float64Array(0),
    capHeight: new Float64Array(0),
    computedLineHeight: new Float64Array(0),
  }

  const paint: PaintTable = {
    paintNodeId: new Uint32Array(0),
    subjectId: new Uint32Array(0),
    stackingContextId: new Uint32Array(0),
    bucket: new Uint16Array(0),
    localPaintIndex: new Uint32Array(0),
  }

  const visibility: VisibilityTable = {
    subjectId: new Uint32Array(0),
    isRendered: new Uint8Array(0),
    isVisible: new Uint8Array(0),
    visibleArea: new Float64Array(0),
    clippedArea: new Float64Array(0),
  }

  const provenance: ProvenanceTable = {
    factId: new Uint32Array(snapshot.provenance.map((p: any) => p.factId)),
    extractionStepId: new Uint32Array(snapshot.provenance.map((p: any) => p.extractionStepId)),
    sourceKind: new Uint16Array(snapshot.provenance.map((p: any) => p.sourceKind)),
    sourceRef: new Uint32Array(snapshot.provenance.map((p: any) => p.sourceRef)),
  }

  const confidence: ConfidenceTable = {
    factId: new Uint32Array(snapshot.confidence.map((c: any) => c.factId)),
    confidence: new Float32Array(snapshot.confidence.map((c: any) => c.confidence)),
    reasonCode: new Uint16Array(snapshot.confidence.map((c: any) => c.reasonCode)),
  }

  return {
    sceneId: snapshot.sceneId,
    snapshotId: snapshot.snapshotId,
    env,
    source,
    strings,
    subjects,
    dom,
    frames,
    matrices,
    rects,
    boxes,
    visualBoxes: boxes,
    fragments,
    transforms,
    styles,
    text,
    topology,
    scroll,
    clipping,
    paint,
    visibility,
    provenance,
    confidence,
  }
}

// ---------------------------------------------------------------------------
// Empty World Factory (for error fallback)
// ---------------------------------------------------------------------------

function createEmptyWorld(sceneId: ImhotepId, snapshotId: ImhotepId): GeometryWorld {
  return {
    sceneId,
    snapshotId,
    env: {
      viewportWidth: 0,
      viewportHeight: 0,
      deviceScaleFactor: 1,
      colorScheme: 'light',
      pointer: 'fine',
      hover: false,
      reducedMotion: 'no-preference',
      locale: 'en',
      writingMode: 'horizontal-tb',
    },
    source: {
      url: '',
      browserName: '',
      browserVersion: '',
      engine: 'chromium-cdp',
      extractedAt: 0,
    },
    strings: { values: [] },
    subjects: {
      ids: new Uint32Array(0),
      domNodeId: new Uint32Array(0),
      subjectKind: new Uint16Array(0),
      primaryBoxId: new Uint32Array(0),
      firstFragmentId: new Uint32Array(0),
      fragmentCount: new Uint16Array(0),
      firstTextRunId: new Uint32Array(0),
      textRunCount: new Uint16Array(0),
    },
    dom: {
      nodeId: new Uint32Array(0),
      backendNodeId: new Uint32Array(0),
      parentNodeId: new Uint32Array(0),
      firstChildIndex: new Uint32Array(0),
      childCount: new Uint16Array(0),
      shadowRootKind: new Uint8Array(0),
      tagNameStringId: new Uint32Array(0),
      roleStringId: new Uint32Array(0),
      ariaNameStringId: new Uint32Array(0),
    },
    frames: {
      frameId: new Uint32Array(0),
      frameKind: new Uint16Array(0),
      ownerSubjectId: new Uint32Array(0),
      parentFrameId: new Uint32Array(0),
      originX: new Float64Array(0),
      originY: new Float64Array(0),
      axisMatrixStart: new Uint32Array(0),
      clipRectId: new Uint32Array(0),
      scrollContainerId: new Uint32Array(0),
      writingMode: new Uint16Array(0),
    },
    matrices: { values: new Float64Array(0) },
    rects: {
      rectId: new Uint32Array(0),
      left: new Float64Array(0),
      top: new Float64Array(0),
      right: new Float64Array(0),
      bottom: new Float64Array(0),
    },
    boxes: {
      boxId: new Uint32Array(0),
      subjectId: new Uint32Array(0),
      frameId: new Uint32Array(0),
      borderLeft: new Float64Array(0),
      borderTop: new Float64Array(0),
      borderRight: new Float64Array(0),
      borderBottom: new Float64Array(0),
      paddingLeft: new Float64Array(0),
      paddingTop: new Float64Array(0),
      paddingRight: new Float64Array(0),
      paddingBottom: new Float64Array(0),
      contentLeft: new Float64Array(0),
      contentTop: new Float64Array(0),
      contentRight: new Float64Array(0),
      contentBottom: new Float64Array(0),
    },
    visualBoxes: {
      boxId: new Uint32Array(0),
      subjectId: new Uint32Array(0),
      frameId: new Uint32Array(0),
      borderLeft: new Float64Array(0),
      borderTop: new Float64Array(0),
      borderRight: new Float64Array(0),
      borderBottom: new Float64Array(0),
      paddingLeft: new Float64Array(0),
      paddingTop: new Float64Array(0),
      paddingRight: new Float64Array(0),
      paddingBottom: new Float64Array(0),
      contentLeft: new Float64Array(0),
      contentTop: new Float64Array(0),
      contentRight: new Float64Array(0),
      contentBottom: new Float64Array(0),
    },
    fragments: {
      fragmentId: new Uint32Array(0),
      subjectId: new Uint32Array(0),
      fragmentKind: new Uint16Array(0),
      boxLeft: new Float64Array(0),
      boxTop: new Float64Array(0),
      boxRight: new Float64Array(0),
      boxBottom: new Float64Array(0),
      lineIndex: new Int32Array(0),
      flowIndex: new Int32Array(0),
      parentFragmentId: new Uint32Array(0),
    },
    transforms: {
      transformId: new Uint32Array(0),
      subjectId: new Uint32Array(0),
      matrixStart: new Uint32Array(0),
      matrixLength: new Uint16Array(0),
      originX: new Float64Array(0),
      originY: new Float64Array(0),
    },
    styles: {
      subjectId: new Uint32Array(0),
      display: new Uint16Array(0),
      position: new Uint16Array(0),
      zIndexKind: new Uint8Array(0),
      zIndexValue: new Int32Array(0),
      overflowX: new Uint16Array(0),
      overflowY: new Uint16Array(0),
      opacity: new Float32Array(0),
      visibility: new Uint16Array(0),
      containFlags: new Uint32Array(0),
      pointerEvents: new Uint16Array(0),
      lineHeight: new Float64Array(0),
      fontFamilyStringId: new Uint32Array(0),
      fontSize: new Float64Array(0),
      fontWeight: new Uint16Array(0),
    },
    text: {
      runId: new Uint32Array(0),
      subjectId: new Uint32Array(0),
      contentStringId: new Uint32Array(0),
      lineBoxId: new Uint32Array(0),
      inkLeft: new Float64Array(0),
      inkTop: new Float64Array(0),
      inkRight: new Float64Array(0),
      inkBottom: new Float64Array(0),
      baselineY: new Float64Array(0),
      capHeight: new Float64Array(0),
      computedLineHeight: new Float64Array(0),
    },
    topology: {
      containingBlockOf: new Uint32Array(0),
      nearestPositionedAncestorOf: new Uint32Array(0),
      scrollContainerOf: new Uint32Array(0),
      stackingContextOf: new Uint32Array(0),
      formattingContextOf: new Uint32Array(0),
      clippingRootOf: new Uint32Array(0),
      paintOrderBucket: new Uint16Array(0),
      paintOrderIndex: new Uint32Array(0),
    },
    scroll: {
      containerId: new Uint32Array(0),
      scrollLeft: new Float64Array(0),
      scrollTop: new Float64Array(0),
      scrollWidth: new Float64Array(0),
      scrollHeight: new Float64Array(0),
      clientWidth: new Float64Array(0),
      clientHeight: new Float64Array(0),
    },
    clipping: {
      clipNodeId: new Uint32Array(0),
      subjectId: new Uint32Array(0),
      clipKind: new Uint16Array(0),
      clipLeft: new Float64Array(0),
      clipTop: new Float64Array(0),
      clipRight: new Float64Array(0),
      clipBottom: new Float64Array(0),
      parentClipNodeId: new Uint32Array(0),
    },
    paint: {
      paintNodeId: new Uint32Array(0),
      subjectId: new Uint32Array(0),
      stackingContextId: new Uint32Array(0),
      bucket: new Uint16Array(0),
      localPaintIndex: new Uint32Array(0),
    },
    visibility: {
      subjectId: new Uint32Array(0),
      isRendered: new Uint8Array(0),
      isVisible: new Uint8Array(0),
      visibleArea: new Float64Array(0),
      clippedArea: new Float64Array(0),
    },
    provenance: {
      factId: new Uint32Array(0),
      extractionStepId: new Uint32Array(0),
      sourceKind: new Uint16Array(0),
      sourceRef: new Uint32Array(0),
    },
    confidence: {
      factId: new Uint32Array(0),
      confidence: new Float32Array(0),
      reasonCode: new Uint16Array(0),
    },
  }
}

// ---------------------------------------------------------------------------
// Diagnostic Format Converters
// ---------------------------------------------------------------------------

function plannerDiagnosticToCore(d: { code: string; severity: string; message: string; category?: string }): Diagnostic {
  return createDiagnostic(
    d.code as Diagnostic['code'],
    (d.category as Diagnostic['category']) ?? 'extraction-error',
    d.severity as Diagnostic['severity'],
    d.message,
    { source: 'imhotep-extractor' },
  )
}

function cdpDiagnosticToCore(d: { code: string; severity: string; message: string; subjectId?: string; selector?: string }, requestId: string): Diagnostic {
  return createDiagnostic(
    d.code as Diagnostic['code'],
    'extraction-error',
    d.severity as Diagnostic['severity'],
    d.message,
    {
      source: 'imhotep-cdp',
      sceneId: requestId,
    },
  )
}

function solverDiagnosticToCore(d: { code: string; severity: string; category: string; message: string; clauseId?: string }): Diagnostic {
  return createDiagnostic(
    d.code as Diagnostic['code'],
    d.category as Diagnostic['category'],
    d.severity as Diagnostic['severity'],
    d.message,
    {
      source: 'imhotep-solver',
      clauseId: d.clauseId,
    },
  )
}

function coreDiagnosticToSolver(d: Diagnostic): { code: string; severity: 'error' | 'warning' | 'info'; category: string; message: string; clauseId?: string } {
  return {
    code: d.code,
    severity: d.severity,
    category: d.category,
    message: d.message,
    clauseId: d.clauseId,
  }
}