gupi-osint-board/src/boardDomain.ts

import type { CaseState, Evidence, TimelineRange, Viewport, WidgetRelation } from './types'

export interface BoardPoint { x: number; y: number }

function threadControls(from: BoardPoint, to: BoardPoint, tightness = 65) {
  const tautness = Math.max(0, Math.min(100, Number(tightness) || 0)) / 100
  const distance = Math.hypot(to.x - from.x, to.y - from.y)
  const sag = (1 - tautness) * Math.min(190, Math.max(45, distance * .28))
  const c1 = { x: from.x + (to.x - from.x) / 3, y: from.y + (to.y - from.y) / 3 + sag }
  const c2 = { x: from.x + (to.x - from.x) * 2 / 3, y: from.y + (to.y - from.y) * 2 / 3 + sag }
  return { c1, c2 }
}

function cubicPoint(from: BoardPoint, c1: BoardPoint, c2: BoardPoint, to: BoardPoint, t: number) {
  const inverse = 1 - t
  return {
    x: inverse ** 3 * from.x + 3 * inverse ** 2 * t * c1.x + 3 * inverse * t ** 2 * c2.x + t ** 3 * to.x,
    y: inverse ** 3 * from.y + 3 * inverse ** 2 * t * c1.y + 3 * inverse * t ** 2 * c2.y + t ** 3 * to.y,
  }
}

function cubicTangent(from: BoardPoint, c1: BoardPoint, c2: BoardPoint, to: BoardPoint, t: number) {
  const inverse = 1 - t
  return {
    x: 3 * inverse ** 2 * (c1.x - from.x) + 6 * inverse * t * (c2.x - c1.x) + 3 * t ** 2 * (to.x - c2.x),
    y: 3 * inverse ** 2 * (c1.y - from.y) + 6 * inverse * t * (c2.y - c1.y) + 3 * t ** 2 * (to.y - c2.y),
  }
}

export function threadTagLateralLimit(tightness = 65) {
  const normalized = Math.max(0, Math.min(100, Number(tightness) || 0))
  return Math.round(10 + (100 - normalized) * .6)
}

export function threadTagPlacement(from: BoardPoint, to: BoardPoint, tightness = 65, positionPercent = 50, lateralOffset = 0) {
  const { c1, c2 } = threadControls(from, to, tightness)
  const position = Math.max(5, Math.min(95, Number(positionPercent) || 50))
  const t = position / 100
  const point = cubicPoint(from, c1, c2, to, t)
  const tangent = cubicTangent(from, c1, c2, to, t)
  const length = Math.hypot(tangent.x, tangent.y) || 1
  const normal = { x: -tangent.y / length, y: tangent.x / length }
  const maxLateralOffset = threadTagLateralLimit(tightness)
  const offset = Math.max(-maxLateralOffset, Math.min(maxLateralOffset, Number(lateralOffset) || 0))
  return { x: point.x + normal.x * offset, y: point.y + normal.y * offset, positionPercent: position, lateralOffset: offset, maxLateralOffset }
}

export function projectThreadTag(from: BoardPoint, to: BoardPoint, tightness: number, pointer: BoardPoint) {
  const { c1, c2 } = threadControls(from, to, tightness)
  let bestT = .5
  let bestDistance = Number.POSITIVE_INFINITY
  for (let index = 5; index <= 95; index += 1) {
    const t = index / 100
    const point = cubicPoint(from, c1, c2, to, t)
    const distance = (pointer.x - point.x) ** 2 + (pointer.y - point.y) ** 2
    if (distance < bestDistance) { bestDistance = distance; bestT = t }
  }
  const point = cubicPoint(from, c1, c2, to, bestT)
  const tangent = cubicTangent(from, c1, c2, to, bestT)
  const length = Math.hypot(tangent.x, tangent.y) || 1
  const normal = { x: -tangent.y / length, y: tangent.x / length }
  const maxLateralOffset = threadTagLateralLimit(tightness)
  const lateralOffset = Math.max(-maxLateralOffset, Math.min(maxLateralOffset, (pointer.x - point.x) * normal.x + (pointer.y - point.y) * normal.y))
  return { positionPercent: Math.round(bestT * 100), lateralOffset: Math.round(lateralOffset), maxLateralOffset }
}

export function threadCurve(from: BoardPoint, to: BoardPoint, tightness = 65) {
  const { c1, c2 } = threadControls(from, to, tightness)
  const midpoint = cubicPoint(from, c1, c2, to, .5)
  return { path: `M ${from.x} ${from.y} C ${c1.x} ${c1.y}, ${c2.x} ${c2.y}, ${to.x} ${to.y}`, midpoint }
}

export const MIN_BOARD_ZOOM = 0.45
export const MAX_BOARD_ZOOM = 1.5

export function clampBoardZoom(zoom: number) {
  return Math.max(MIN_BOARD_ZOOM, Math.min(MAX_BOARD_ZOOM, zoom))
}

export function zoomFromWheel(currentZoom: number, deltaY: number) {
  return clampBoardZoom(currentZoom - deltaY * 0.0015)
}

export function zoomFromPinch(currentZoom: number, previousDistance: number, nextDistance: number) {
  if (!Number.isFinite(previousDistance) || !Number.isFinite(nextDistance) || previousDistance <= 0 || nextDistance <= 0) return currentZoom
  return clampBoardZoom(currentZoom * nextDistance / previousDistance)
}

export function zoomViewportAt(viewport: Viewport, nextZoom: number, screenAnchor: BoardPoint): Viewport {
  if (!Number.isFinite(viewport.zoom) || viewport.zoom <= 0) throw new RangeError('Board zoom must be positive')
  const zoom = clampBoardZoom(nextZoom)
  const boardPoint = { x: (screenAnchor.x - viewport.x) / viewport.zoom, y: (screenAnchor.y - viewport.y) / viewport.zoom }
  return { x: screenAnchor.x - boardPoint.x * zoom, y: screenAnchor.y - boardPoint.y * zoom, zoom }
}

export function moveBoardPoint(origin: { x: number; y: number }, screenDelta: { x: number; y: number }, zoom: number) {
  if (!Number.isFinite(zoom) || zoom <= 0) throw new RangeError('Board zoom must be positive')
  return { x: origin.x + screenDelta.x / zoom, y: origin.y + screenDelta.y / zoom }
}

export function nextOpenBoardPosition(
  evidence: Pick<Evidence, 'x' | 'y' | 'width'>[],
  preferred: { x: number; y: number },
  size: { width: number; height?: number },
  bounds = { width: 2400, height: 1500 },
) {
  const height = size.height || 160
  const gap = 28
  const overlaps = (x: number, y: number) => evidence.some(item =>
    x < item.x + item.width + gap && x + size.width + gap > item.x &&
    y < item.y + 160 + gap && y + height + gap > item.y)
  const xStep = size.width + 46
  const yStep = height + 46
  for (let row = 0; row < 7; row += 1) {
    for (const column of [0, 1, -1, 2, -2, 3, -3]) {
      const x = Math.max(80, Math.min(bounds.width - size.width - 80, preferred.x + column * xStep))
      const y = Math.max(100, Math.min(bounds.height - height - 80, preferred.y + row * yStep))
      if (!overlaps(x, y)) return { x, y }
    }
  }
  return { x: Math.max(80, Math.min(bounds.width - size.width - 80, preferred.x)), y: Math.min(bounds.height - height - 80, preferred.y + evidence.length * 24) }
}

export function panViewport(origin: Viewport, screenDelta: { x: number; y: number }): Viewport {
  return { ...origin, x: origin.x + screenDelta.x, y: origin.y + screenDelta.y }
}

export function dateValue(date: string) {
  const parsed = Date.parse(date)
  return Number.isFinite(parsed) ? parsed : 0
}

export function timelineRange(dates: string[], fallbackYear = new Date().getFullYear(), configured?: TimelineRange) {
  if (configured) {
    const start = Date.parse(`${configured.start}T00:00:00.000Z`)
    const end = Date.parse(`${configured.end}T23:59:59.999Z`)
    if (Number.isFinite(start) && Number.isFinite(end) && end > start) {
      return { startYear: Number(configured.start.slice(0, 4)), endYear: Number(configured.end.slice(0, 4)), start, end }
    }
  }
  const years = dates
    .map(date => Number(date.slice(0, 4)))
    .filter(year => Number.isFinite(year) && year >= 1 && year <= 9999)
  let startYear = years.length ? Math.min(...years) : fallbackYear - 2
  let endYear = years.length ? Math.max(...years) : startYear + 4
  if (endYear - startYear < 4) {
    const missing = 4 - (endYear - startYear)
    startYear -= Math.floor(missing / 2)
    endYear += Math.ceil(missing / 2)
  }
  return { startYear, endYear, start: Date.UTC(startYear, 0, 1), end: Date.UTC(endYear, 11, 31) }
}

export function timelinePositionPercent(date: string, range: Pick<ReturnType<typeof timelineRange>, 'start' | 'end'>) {
  if (range.end <= range.start) throw new RangeError('Timeline range must have positive duration')
  return Math.max(0, Math.min(100, ((dateValue(date) - range.start) / (range.end - range.start)) * 100))
}

export function containedIds(state: CaseState, widgetId: string) {
  return state.relations
    .filter(relation => relation.type === 'contains' && relation.fromWidgetId === widgetId)
    .sort((a, b) => (a.sortOrder || 0) - (b.sortOrder || 0))
    .map(relation => relation.toWidgetId)
}

export function folderIsOpen(folder: Evidence) {
  return folder.config?.open === true
}

export function relationPosition(state: CaseState, relation: WidgetRelation) {
  const folder = state.evidence.find(widget => widget.id === relation.fromWidgetId)
  const order = relation.sortOrder || 0
  const configuredX = Number(relation.config?.x)
  const configuredY = Number(relation.config?.y)
  return {
    x: Number.isFinite(configuredX) ? configuredX : (folder?.x || 100) + (folder?.width || 240) + 90 + (order % 3) * 205,
    y: Number.isFinite(configuredY) ? configuredY : (folder?.y || 100) - 30 + Math.floor(order / 3) * 185,
  }
}

export function normalizeCase(state: CaseState): CaseState {
  const relations = Array.isArray(state.relations)
    ? state.relations
    : state.evidence.flatMap(widget => (widget.containedDocumentIds || (widget.sourceDocumentId ? [widget.sourceDocumentId] : [])).map((documentId, index) => ({
      id: `contains:${widget.id}:${documentId}`,
      fromWidgetId: widget.id,
      toWidgetId: documentId,
      type: 'contains',
      sortOrder: index,
    })))
  const normalized = { ...state, relations }
  return {
    ...normalized,
    brief: state.brief || { body: '', concepts: [] },
    documents: state.documents.map(document => ({
      ...document,
      fileType: document.fileType || (document.mimeType?.startsWith('image/') ? 'image' : document.mimeType === 'application/pdf' ? 'pdf' : 'file'),
      metadata: document.metadata || {},
    })),
    evidence: state.evidence.map(widget => ({
      ...widget,
      type: widget.type === 'evidence' ? 'folder' : widget.type,
      config: widget.config || {},
      containedDocumentIds: containedIds(normalized, widget.id),
    })),
  }
}