// perf.test.ts - Performance regression tests for Imhotep core hot paths
// Uses Node.js built-in test runner and performance hooks.
// Targets (V1 developer guide):
//   Unit tests < 10ms each
//   Integration tests < 100ms each
//   Compilation < 5ms per assertion
//   Extraction < 50ms per page
//   Solving < 1ms per clause

import { describe, it } from 'node:test'
import assert from 'node:assert'
import { performance } from 'node:perf_hooks'

import { compile } from 'imhotep-dsl'
import {
  normalizeSubjects,
  normalizeBoxes,
  normalizeTopology,
  normalizeFrames,
  buildTransformChain,
  composeTransform2D,
  clearTransformCaches,
} from 'imhotep-geometry'
import { evaluate, registerDefaultClauses } from 'imhotep-solver'

describe('Performance regression — compilation', () => {
  it('compiles 100 assertions in under 500ms', () => {
    const assertions = generateAssertions(100)
    const start = performance.now()
    const ir = compile(assertions)
    const duration = performance.now() - start
    assert.strictEqual(
      duration < 500,
      true,
      `Compilation took ${duration.toFixed(2)}ms`
    )
  })

  it('compiles 10 assertions in under 50ms (5ms per assertion)', () => {
    const assertions = generateAssertions(10)
    const start = performance.now()
    compile(assertions)
    const duration = performance.now() - start
    assert.strictEqual(
      duration < 50,
      true,
      `Compilation took ${duration.toFixed(2)}ms`
    )
  })
})

describe('Performance regression — world creation', () => {
  it('normalizes 1000 subjects in under 50ms', () => {
    const raw = generateRawSubjects(1000)
    const start = performance.now()
    normalizeSubjects(raw)
    const duration = performance.now() - start
    assert.strictEqual(
      duration < 50,
      true,
      `Subject normalization took ${duration.toFixed(2)}ms`
    )
  })

  it('normalizes 1000 boxes in under 50ms', () => {
    const raw = generateRawBoxes(1000)
    const start = performance.now()
    normalizeBoxes(raw)
    const duration = performance.now() - start
    assert.strictEqual(
      duration < 50,
      true,
      `Box normalization took ${duration.toFixed(2)}ms`
    )
  })

  it('normalizes topology in under 25ms', () => {
    const raw = generateRawTopology(1000)
    const start = performance.now()
    normalizeTopology(raw, 1000)
    const duration = performance.now() - start
    assert.strictEqual(
      duration < 25,
      true,
      `Topology normalization took ${duration.toFixed(2)}ms`
    )
  })
})

describe('Performance regression — frame resolution', () => {
  it('resolves 100 transform chains in under 50ms', () => {
    const matrices = generateTransformMatrices()
    const start = performance.now()
    for (let i = 0; i < 100; i++) {
      buildTransformChain(matrices)
    }
    const duration = performance.now() - start
    assert.strictEqual(
      duration < 50,
      true,
      `Frame resolution took ${duration.toFixed(2)}ms`
    )
  })

  it('composes 100 2D transforms in under 100ms', () => {
    const start = performance.now()
    for (let i = 0; i < 100; i++) {
      composeTransform2D(0, 0, i, i, 0, 1, 1)
    }
    const duration = performance.now() - start
    assert.strictEqual(
      duration < 100,
      true,
      `Transform composition took ${duration.toFixed(2)}ms`
    )
  })

  it('caches repeated transform chains (second pass under 1ms)', () => {
    const matrices = generateTransformMatrices()
    clearTransformCaches()
    buildTransformChain(matrices) // warm cache
    const start = performance.now()
    for (let i = 0; i < 100; i++) {
      buildTransformChain(matrices)
    }
    const duration = performance.now() - start
    assert.strictEqual(
      duration < 1,
      true,
      `Cached frame resolution took ${duration.toFixed(2)}ms`
    )
  })
})

describe('Performance regression — solving', () => {
  it('evaluates 100 clauses in under 100ms (1ms per clause)', () => {
    registerDefaultClauses()
    const world = generateMinimalWorld()
    const clauses = generateClauses(100)
    const start = performance.now()
    evaluate(world, clauses, { skipMissingEvaluators: true })
    const duration = performance.now() - start
    assert.strictEqual(
      duration < 100,
      true,
      `Solving took ${duration.toFixed(2)}ms`
    )
  })

  it('evaluates 10 clauses in under 25ms', () => {
    registerDefaultClauses()
    const world = generateMinimalWorld()
    const clauses = generateClauses(10)
    const start = performance.now()
    evaluate(world, clauses, { skipMissingEvaluators: true })
    const duration = performance.now() - start
    assert.strictEqual(
      duration < 25,
      true,
      `Solving took ${duration.toFixed(2)}ms`
    )
  })
})

// ---------------------------------------------------------------------------
// Mock data generators
// ---------------------------------------------------------------------------

function generateAssertions(n: number): Array<{
  type: 'RelationAssertion'
  relation: string
  subject: { type: 'SelectorRef'; value: string }
  reference: { type: 'SelectorRef'; value: string }
  options: { type: 'RelationOptions' }
}> {
  return Array.from({ length: n }, (_, i) => ({
    type: 'RelationAssertion' as const,
    relation: i % 2 === 0 ? 'leftOf' : 'above',
    subject: { type: 'SelectorRef' as const, value: `.s-${i}` },
    reference: { type: 'SelectorRef' as const, value: `.r-${i}` },
    options: { type: 'RelationOptions' as const },
  }))
}

function generateRawSubjects(n: number): Array<{
  id: number
  domNodeId: number
  kind: string
  primaryBoxId: number
  firstFragmentId: number
  fragmentCount: number
  firstTextRunId: number
  textRunCount: number
}> {
  return Array.from({ length: n }, (_, i) => ({
    id: i,
    domNodeId: i,
    kind: 'element',
    primaryBoxId: i,
    firstFragmentId: 0,
    fragmentCount: 0,
    firstTextRunId: 0,
    textRunCount: 0,
  }))
}

function generateRawBoxes(n: number): Array<{
  id: 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
}> {
  return Array.from({ length: n }, (_, i) => ({
    id: i,
    subjectId: i,
    frameId: 0,
    borderLeft: 0,
    borderTop: 0,
    borderRight: 10,
    borderBottom: 10,
    paddingLeft: 0,
    paddingTop: 0,
    paddingRight: 0,
    paddingBottom: 0,
    contentLeft: 0,
    contentTop: 0,
    contentRight: 10,
    contentBottom: 10,
  }))
}

function generateRawTopology(n: number): {
  containingBlockOf: number[]
  nearestPositionedAncestorOf: number[]
  scrollContainerOf: number[]
  stackingContextOf: number[]
  formattingContextOf: number[]
  clippingRootOf: number[]
  paintOrderBucket: number[]
  paintOrderIndex: number[]
} {
  return {
    containingBlockOf: Array.from({ length: n }, () => 0),
    nearestPositionedAncestorOf: Array.from({ length: n }, () => 0),
    scrollContainerOf: Array.from({ length: n }, () => 0),
    stackingContextOf: Array.from({ length: n }, () => 0),
    formattingContextOf: Array.from({ length: n }, () => 0),
    clippingRootOf: Array.from({ length: n }, () => 0),
    paintOrderBucket: Array.from({ length: n }, () => 0),
    paintOrderIndex: Array.from({ length: n }, () => 0),
  }
}

function generateTransformMatrices(): Float64Array[] {
  return [
    new Float64Array([1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]),
    new Float64Array([1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 10, 10, 0, 1]),
  ]
}

function generateMinimalWorld(): any {
  return {
    sceneId: 'scene_1',
    snapshotId: 'snapshot_1',
    env: {
      viewportWidth: 1280,
      viewportHeight: 720,
      deviceScaleFactor: 1,
      colorScheme: 'light',
      pointer: 'fine',
      hover: false,
      reducedMotion: false,
      locale: 'en',
      writingMode: 'horizontal-tb',
    },
    strings: { values: [] },
    subjects: {
      ids: new Uint32Array([0, 1]),
      domNodeId: new Uint32Array([0, 1]),
      subjectKind: new Uint16Array([1, 1]),
      primaryBoxId: new Uint32Array([0, 1]),
      firstFragmentId: new Uint32Array([0, 0]),
      fragmentCount: new Uint16Array([0, 0]),
    },
    boxes: {
      boxId: new Uint32Array([0, 1]),
      subjectId: new Uint32Array([0, 1]),
      frameId: new Uint32Array([0, 0]),
      borderLeft: new Float64Array([0, 0]),
      borderTop: new Float64Array([0, 0]),
      borderRight: new Float64Array([10, 10]),
      borderBottom: new Float64Array([10, 10]),
      paddingLeft: new Float64Array([0, 0]),
      paddingTop: new Float64Array([0, 0]),
      paddingRight: new Float64Array([0, 0]),
      paddingBottom: new Float64Array([0, 0]),
      contentLeft: new Float64Array([0, 0]),
      contentTop: new Float64Array([0, 0]),
      contentRight: new Float64Array([10, 10]),
      contentBottom: new Float64Array([10, 10]),
    },
    rects: {
      rectId: new Uint32Array([0, 1]),
      left: new Float64Array([0, 5]),
      top: new Float64Array([0, 5]),
      right: new Float64Array([10, 15]),
      bottom: new Float64Array([10, 15]),
    },
    topology: {
      containingBlockOf: new Uint32Array([0, 0]),
      nearestPositionedAncestorOf: new Uint32Array([0, 0]),
      scrollContainerOf: new Uint32Array([0, 0]),
      stackingContextOf: new Uint32Array([0, 0]),
      formattingContextOf: new Uint32Array([0, 0]),
      clippingRootOf: new Uint32Array([0, 0]),
      paintOrderBucket: new Uint16Array([0, 0]),
      paintOrderIndex: new Uint32Array([0, 1]),
    },
    scroll: {
      containerId: new Uint32Array([0]),
      scrollLeft: new Float64Array([0]),
      scrollTop: new Float64Array([0]),
      scrollWidth: new Float64Array([1280]),
      scrollHeight: new Float64Array([720]),
      clientWidth: new Float64Array([1280]),
      clientHeight: new Float64Array([720]),
    },
    clipping: {
      clipNodeId: new Uint32Array([0]),
      subjectId: new Uint32Array([0]),
      clipKind: new Uint16Array([1]),
      clipLeft: new Float64Array([0]),
      clipTop: new Float64Array([0]),
      clipRight: new Float64Array([1280]),
      clipBottom: new Float64Array([720]),
      parentClipNodeId: new Uint32Array([0]),
    },
    visibility: {
      subjectId: new Uint32Array([0, 1]),
      isRendered: new Uint8Array([1, 1]),
      isVisible: new Uint8Array([1, 1]),
      visibleArea: new Float64Array([100, 100]),
      clippedArea: new Float64Array([0, 0]),
    },
  }
}

function generateClauses(n: number): Array<{
  clauseId: string
  clauseKind: string
  version: number
  subjectRef: number
  referenceRef?: number
}> {
  const kinds = [
    'relation.leftOf',
    'relation.above',
    'relation.overlaps',
    'relation.inside',
  ]
  return Array.from({ length: n }, (_, i) => ({
    clauseId: `clause-${i}`,
    clauseKind: kinds[i % kinds.length],
    version: 1,
    subjectRef: 0,
    referenceRef: 1,
  }))
}