// World materialization from extraction results
// Orchestrates normalization into an immutable geometry world

import {
  GeometryWorld,
  StringTable,
  Matrices,
  buildWorldIndex,
  WorldIndex,
} from './world.js'
import {
  RawExtractionResult,
  normalizeEnv,
  normalizeSource,
  normalizeSubjects,
  normalizeDom,
  normalizeFrames,
  normalizeRects,
  normalizeBoxes,
  normalizeFragments,
  normalizeTransforms,
  normalizeStyles,
  normalizeText,
  normalizeTopology,
  normalizeScroll,
  normalizeClipping,
  normalizePaint,
  normalizeVisibility,
  normalizeProvenance,
  normalizeConfidence,
} from './normalize.js'
import { IDENTITY_4X4 } from './transforms.js'

// ---------------------------------------------------------------------------
// Materialization
// ---------------------------------------------------------------------------

/**
 * Materialize a geometry world from raw extraction results.
 * The returned world is immutable and fully indexed.
 */
export function materializeWorld(raw: RawExtractionResult): GeometryWorld {
  const strings: StringTable = { values: [] }

  const env = normalizeEnv(raw.env, strings)
  const source = normalizeSource(raw.source, strings)

  const sceneId = strings.values.indexOf(raw.sceneId)
  const snapshotId = strings.values.indexOf(raw.snapshotId)

  const subjects = normalizeSubjects(raw.subjects)
  const dom = normalizeDom(raw.dom, strings)
  const rects = normalizeRects(raw.rects)
  const boxes = normalizeBoxes(raw.boxes)
  const fragments = normalizeFragments(raw.fragments)

  let matrices: Matrices = { values: new Float64Array(0) }

  const framesResult = normalizeFrames(raw.frames, strings, matrices)
  const frames = framesResult.frames
  matrices = framesResult.matrices

  const transformsResult = normalizeTransforms(raw.transforms, matrices)
  const transforms = transformsResult.transforms
  matrices = transformsResult.matrices

  const styles = normalizeStyles(raw.styles, strings)
  const text = normalizeText(raw.text, strings)
  const topology = normalizeTopology(raw.topology, raw.subjects.length)
  const scroll = normalizeScroll(raw.scroll)
  const clipping = normalizeClipping(raw.clipping, strings)
  const paint = normalizePaint(raw.paint)
  const visibility = normalizeVisibility(raw.visibility)
  const provenance = normalizeProvenance(raw.provenance, strings)
  const confidence = normalizeConfidence(raw.confidence, strings)

  const world: GeometryWorld = {
    sceneId: sceneId >= 0 ? sceneId : strings.values.push(raw.sceneId) - 1,
    snapshotId: snapshotId >= 0 ? snapshotId : strings.values.push(raw.snapshotId) - 1,
    env,
    source,
    strings,
    subjects,
    dom,
    frames,
    matrices,
    rects,
    boxes,
    fragments,
    transforms,
    styles,
    text,
    topology,
    scroll,
    clipping,
    paint,
    visibility,
    provenance,
    confidence,
    selectorIndex: new Map<string, number[]>(),
    ancestorIndex: new Map<number, number[]>(),
    lineBoxIndex: new Map<number, number[]>(),
    textRunIndex: new Map<number, number[]>(),
  }

  buildDomainIndexes(world)

  return world
}

// ---------------------------------------------------------------------------
// Domain index construction (V1.1)
// ---------------------------------------------------------------------------

function buildDomainIndexes(world: GeometryWorld): void {
  // Build selector index: tag names and class selectors for element subjects.
  const selectorIndex = world.selectorIndex
  const domNodeById = new Map<number, number>()
  for (let i = 0; i < world.dom.nodeId.length; i++) {
    domNodeById.set(world.dom.nodeId[i], i)
  }

  for (let i = 0; i < world.subjects.ids.length; i++) {
    const subjectId = world.subjects.ids[i]
    const kind = world.subjects.subjectKind[i]
    const domNodeId = world.subjects.domNodeId[i]
    if (kind !== 1 /* SubjectKind.Element */ || domNodeId === 0) continue

    const domIdx = domNodeById.get(domNodeId)
    if (domIdx === undefined) continue

    // Tag selector
    const tagName = world.strings.values[world.dom.tagNameStringId[domIdx]]
    if (tagName) {
      const tagSelector = tagName.toLowerCase()
      const tagList = selectorIndex.get(tagSelector) ?? []
      tagList.push(subjectId)
      selectorIndex.set(tagSelector, tagList)
    }

    // Class selectors
    const classIds = world.dom.classNameStringIds[domIdx]
    for (let c = 0; c < classIds.length; c++) {
      const className = world.strings.values[classIds[c]]
      if (className) {
        const classSelector = '.' + className.toLowerCase()
        const classList = selectorIndex.get(classSelector) ?? []
        classList.push(subjectId)
        selectorIndex.set(classSelector, classList)
      }
    }
  }

  // Sort all selector lists for deterministic enumeration
  for (const [key, ids] of selectorIndex) {
    ids.sort((a, b) => a - b)
    selectorIndex.set(key, ids)
  }

  // Build ancestor index: element id -> sorted descendant ids (transitive)
  const ancestorIndex = world.ancestorIndex
  const childrenByParent = new Map<number, number[]>()
  for (let i = 0; i < world.dom.nodeId.length; i++) {
    const parentId = world.dom.parentNodeId[i]
    if (parentId !== 0) {
      const arr = childrenByParent.get(parentId) ?? []
      arr.push(world.dom.nodeId[i])
      childrenByParent.set(parentId, arr)
    }
  }

  // Map DOM node IDs to subject IDs for elements
  const subjectByDomNodeId = new Map<number, number>()
  for (let i = 0; i < world.subjects.ids.length; i++) {
    const domNodeId = world.subjects.domNodeId[i]
    if (domNodeId !== 0) {
      subjectByDomNodeId.set(domNodeId, world.subjects.ids[i])
    }
  }

  function collectDescendants(domNodeId: number, out: number[]): void {
    const childDomIds = childrenByParent.get(domNodeId)
    if (!childDomIds) return
    for (const childDomId of childDomIds) {
      const childSubjectId = subjectByDomNodeId.get(childDomId)
      if (childSubjectId !== undefined) {
        out.push(childSubjectId)
        collectDescendants(childDomId, out)
      }
    }
  }

  for (let i = 0; i < world.dom.nodeId.length; i++) {
    const domNodeId = world.dom.nodeId[i]
    const subjectId = subjectByDomNodeId.get(domNodeId)
    if (subjectId !== undefined) {
      const descendants: number[] = []
      collectDescendants(domNodeId, descendants)
      descendants.sort((a, b) => a - b)
      ancestorIndex.set(subjectId, descendants)
    }
  }

  // Build lineBoxIndex: text node subject id -> line box fragment ids
  const lineBoxIndex = world.lineBoxIndex
  for (let i = 0; i < world.fragments.fragmentId.length; i++) {
    if (world.fragments.fragmentKind[i] === 1 /* FragmentKind.Line */) {
      const subjectId = world.fragments.subjectId[i]
      const arr = lineBoxIndex.get(subjectId) ?? []
      arr.push(world.fragments.fragmentId[i])
      lineBoxIndex.set(subjectId, arr)
    }
  }
  for (const [key, ids] of lineBoxIndex) {
    ids.sort((a, b) => a - b)
    lineBoxIndex.set(key, ids)
  }

  // Build textRunIndex: text node subject id -> text run ids
  const textRunIndex = world.textRunIndex
  for (let i = 0; i < world.text.runId.length; i++) {
    const subjectId = world.text.subjectId[i]
    const arr = textRunIndex.get(subjectId) ?? []
    arr.push(world.text.runId[i])
    textRunIndex.set(subjectId, arr)
  }
  for (const [key, ids] of textRunIndex) {
    ids.sort((a, b) => a - b)
    textRunIndex.set(key, ids)
  }
}

/**
 * Materialize a world and build its index in one call.
 */
export function materializeWorldWithIndex(raw: RawExtractionResult): {
  world: GeometryWorld
  index: WorldIndex
} {
  const world = materializeWorld(raw)
  const index = buildWorldIndex(world)
  return { world, index }
}

// ---------------------------------------------------------------------------
// World validation
// ---------------------------------------------------------------------------

export interface WorldValidationError {
  code: string
  message: string
  table: string
  index: number
}

/**
 * Validate a geometry world for structural integrity.
 * Returns a list of validation errors (empty if valid).
 */
export function validateWorld(world: GeometryWorld): WorldValidationError[] {
  const errors: WorldValidationError[] = []

  // Check that subjects have valid domNodeId references
  for (let i = 0; i < world.subjects.ids.length; i++) {
    const domNodeId = world.subjects.domNodeId[i]
    if (domNodeId === 0) continue
    let found = false
    for (let j = 0; j < world.dom.nodeId.length; j++) {
      if (world.dom.nodeId[j] === domNodeId) {
        found = true
        break
      }
    }
    if (!found) {
      errors.push({
        code: 'INVALID_DOM_REF',
        message: `Subject ${world.subjects.ids[i]} references missing domNodeId ${domNodeId}`,
        table: 'subjects',
        index: i,
      })
    }
  }

  // Check that boxes have valid subject and frame references
  for (let i = 0; i < world.boxes.boxId.length; i++) {
    const subjectId = world.boxes.subjectId[i]
    let foundSubject = false
    for (let j = 0; j < world.subjects.ids.length; j++) {
      if (world.subjects.ids[j] === subjectId) {
        foundSubject = true
        break
      }
    }
    if (!foundSubject) {
      errors.push({
        code: 'INVALID_SUBJECT_REF',
        message: `Box ${world.boxes.boxId[i]} references missing subjectId ${subjectId}`,
        table: 'boxes',
        index: i,
      })
    }

    const frameId = world.boxes.frameId[i]
    let foundFrame = false
    for (let j = 0; j < world.frames.frameId.length; j++) {
      if (world.frames.frameId[j] === frameId) {
        foundFrame = true
        break
      }
    }
    if (!foundFrame) {
      errors.push({
        code: 'INVALID_FRAME_REF',
        message: `Box ${world.boxes.boxId[i]} references missing frameId ${frameId}`,
        table: 'boxes',
        index: i,
      })
    }
  }

  // Check that frames have valid parent references
  for (let i = 0; i < world.frames.frameId.length; i++) {
    const parentId = world.frames.parentFrameId[i]
    if (parentId === 0) continue
    let found = false
    for (let j = 0; j < world.frames.frameId.length; j++) {
      if (world.frames.frameId[j] === parentId) {
        found = true
        break
      }
    }
    if (!found) {
      errors.push({
        code: 'INVALID_PARENT_FRAME',
        message: `Frame ${world.frames.frameId[i]} references missing parentFrameId ${parentId}`,
        table: 'frames',
        index: i,
      })
    }
  }

  return errors
}