shudao-main/shudao-vue-frontend/src/utils/resizableSidebar.js

export const AI_WRITING_SIDEBAR_SIZE = Object.freeze({
  min: 360,
  default: 520,
  max: 900,
  minMain: 360,
  keyboardStep: 32
})

function toFiniteNumber(value, fallback) {
  const numberValue = Number(value)
  return Number.isFinite(numberValue) ? numberValue : fallback
}

function clamp(value, min, max) {
  return Math.min(Math.max(value, min), max)
}

export function calculateResizableSidebarWidth({
  pointerX,
  containerRight,
  containerWidth,
  minWidth = AI_WRITING_SIDEBAR_SIZE.min,
  maxWidth = AI_WRITING_SIDEBAR_SIZE.max,
  minMainWidth = AI_WRITING_SIDEBAR_SIZE.minMain
} = {}) {
  const safeMinWidth = Math.max(0, toFiniteNumber(minWidth, AI_WRITING_SIDEBAR_SIZE.min))
  const safeMaxWidth = Math.max(safeMinWidth, toFiniteNumber(maxWidth, AI_WRITING_SIDEBAR_SIZE.max))
  const safeMainWidth = Math.max(0, toFiniteNumber(minMainWidth, AI_WRITING_SIDEBAR_SIZE.minMain))
  const safeContainerWidth = Math.max(0, toFiniteNumber(containerWidth, safeMaxWidth + safeMainWidth))
  const availableMaxWidth = Math.max(
    safeMinWidth,
    Math.min(safeMaxWidth, safeContainerWidth - safeMainWidth)
  )

  const rawWidth = toFiniteNumber(containerRight, 0) - toFiniteNumber(pointerX, 0)
  return Math.round(clamp(rawWidth, safeMinWidth, availableMaxWidth))
}