export interface StandardModelWhiteBgView {
  key: StandardModelWhiteBgKey
  label: string
  fieldName: string
}

export type StandardModelWhiteBgKey =
  | 'leftFront45'
  | 'rightFront45'
  | 'leftBack45'
  | 'rightBack45'
  | 'front'
  | 'back'
  | 'left'
  | 'right'

export const STANDARD_MODEL_WHITE_BG_VIEWS: StandardModelWhiteBgView[] = [
  { key: 'leftFront45', label: '左前45°', fieldName: 'whiteBgLeftFront45' },
  { key: 'rightFront45', label: '右前45°', fieldName: 'whiteBgRightFront45' },
  { key: 'leftBack45', label: '左后45°', fieldName: 'whiteBgLeftBack45' },
  { key: 'rightBack45', label: '右后45°', fieldName: 'whiteBgRightBack45' },
  { key: 'front', label: '正视图', fieldName: 'whiteBgFront' },
  { key: 'back', label: '后视图', fieldName: 'whiteBgBack' },
  { key: 'left', label: '左视图', fieldName: 'whiteBgLeft' },
  { key: 'right', label: '右视图', fieldName: 'whiteBgRight' },
]

export const STANDARD_MODEL_WHITE_BG_OTHER_FIELD_NAME = 'whiteBgOtherImages'

export const LEGACY_STANDARD_MODEL_WHITE_BG_ASSET_TYPE = 'standard-model-white-bg-zip'
export const LEGACY_STANDARD_MODEL_WHITE_BG_ASSET_TYPE_PREFIX = 'standard-model-white-bg-zip:'
export const STANDARD_MODEL_WHITE_BG_ASSET_TYPE_PREFIX = 'standard-model-white-bg-zip-v2:'
export const STANDARD_MODEL_WHITE_BG_VIEW_ASSET_TYPE_PREFIX = 'standard-model-white-bg-view:'
export const STANDARD_MODEL_WHITE_BG_OTHER_ASSET_TYPE_PREFIX = 'standard-model-white-bg-other:'

export interface ParsedStandardModelWhiteBgAssetType {
  kind: 'view' | 'other' | 'zip'
  skuId: string
  viewKey?: StandardModelWhiteBgKey
  index?: number
}

export interface WhiteBackgroundAssetLike {
  assetType: string
  sortOrder?: number | string | bigint | null
}

export interface GroupedWhiteBackgroundAssets<T extends WhiteBackgroundAssetLike> {
  skuId: string
  fixed: Partial<Record<StandardModelWhiteBgKey, T>>
  other: T[]
  zipAssets: T[]
}

export function getWhiteBackgroundFieldName(key: StandardModelWhiteBgKey): string {
  const target = STANDARD_MODEL_WHITE_BG_VIEWS.find((item) => item.key === key)
  return target ? target.fieldName : `whiteBg${key}`
}

export function getMissingWhiteBackgroundViews(
  files: Partial<Record<StandardModelWhiteBgKey, File | null>>,
): StandardModelWhiteBgKey[] {
  return STANDARD_MODEL_WHITE_BG_VIEWS
    .map((item) => item.key)
    .filter((key) => !files[key])
}

export function hasCompleteWhiteBackgroundSet(
  files: Partial<Record<StandardModelWhiteBgKey, File | null>>,
): boolean {
  return getMissingWhiteBackgroundViews(files).length === 0
}

export function normalizeWhiteBackgroundSkuName(value: string): string {
  return String(value || '').replace(/[^a-zA-Z0-9\-_.]/g, '').toUpperCase().trim()
}

function sanitizeWhiteBackgroundFilePart(value: string): string {
  return String(value || '')
    .replace(/[\/\\]/g, '-')
    .replace(/[<>:"|?*]/g, '')
    .replace(/\s+/g, '')
    .trim()
}

export function buildWhiteBackgroundFixedFileName(
  skuName: string,
  productCategoryName: string,
  viewLabel: string,
  ext: string,
): string {
  const normalizedSkuName = normalizeWhiteBackgroundSkuName(skuName)
  const safeCategoryName = sanitizeWhiteBackgroundFilePart(productCategoryName)
  const safeViewLabel = sanitizeWhiteBackgroundFilePart(viewLabel)
  const normalizedExt = ext.startsWith('.') ? ext.toLowerCase() : `.${ext.toLowerCase()}`
  const baseName = [normalizedSkuName, safeCategoryName, safeViewLabel].filter(Boolean).join('-')

  return `${baseName || 'white-background'}${normalizedExt}`
}

export function getCurrentWhiteBackgroundAssetType(skuId: string): string {
  return `${STANDARD_MODEL_WHITE_BG_ASSET_TYPE_PREFIX}${skuId}`
}

export function getWhiteBackgroundViewAssetType(
  skuId: string,
  key: StandardModelWhiteBgKey,
): string {
  return `${STANDARD_MODEL_WHITE_BG_VIEW_ASSET_TYPE_PREFIX}${skuId}:${key}`
}

export function getWhiteBackgroundOtherAssetType(skuId: string, index: number): string {
  return `${STANDARD_MODEL_WHITE_BG_OTHER_ASSET_TYPE_PREFIX}${skuId}:${index}`
}

export function getLegacyWhiteBackgroundAssetTypes(skuId: string): string[] {
  return [
    LEGACY_STANDARD_MODEL_WHITE_BG_ASSET_TYPE,
    `${LEGACY_STANDARD_MODEL_WHITE_BG_ASSET_TYPE_PREFIX}${skuId}`,
  ]
}

export function getAllWhiteBackgroundAssetTypesForSku(skuId: string): string[] {
  return [
    getCurrentWhiteBackgroundAssetType(skuId),
    ...getLegacyWhiteBackgroundAssetTypes(skuId),
  ]
}

export function getWhiteBackgroundViewAssetPrefixForSku(skuId: string): string {
  return `${STANDARD_MODEL_WHITE_BG_VIEW_ASSET_TYPE_PREFIX}${skuId}:`
}

export function getWhiteBackgroundOtherAssetPrefixForSku(skuId: string): string {
  return `${STANDARD_MODEL_WHITE_BG_OTHER_ASSET_TYPE_PREFIX}${skuId}:`
}

export function getWhiteBackgroundAssetWhereForSku(skuId: string) {
  return {
    OR: [
      { assetType: getCurrentWhiteBackgroundAssetType(skuId) },
      { assetType: LEGACY_STANDARD_MODEL_WHITE_BG_ASSET_TYPE },
      { assetType: `${LEGACY_STANDARD_MODEL_WHITE_BG_ASSET_TYPE_PREFIX}${skuId}` },
      { assetType: { startsWith: getWhiteBackgroundViewAssetPrefixForSku(skuId) } },
      { assetType: { startsWith: getWhiteBackgroundOtherAssetPrefixForSku(skuId) } },
    ],
  }
}

export function getWhiteBackgroundRelativeDirectory(materialId: string, skuId: string): string {
  return ['uploads', 'skus', materialId, 'white-background', skuId].join('/')
}

export function replaceWhiteBackgroundFileExtension(fileName: string, ext: string = '.webp'): string {
  const normalizedExt = ext.startsWith('.') ? ext.toLowerCase() : `.${ext.toLowerCase()}`
  const normalizedFileName = String(fileName || '').trim().replace(/\\/g, '/')
  if (!normalizedFileName) {
    return `white-background${normalizedExt}`
  }

  const lastSlashIndex = normalizedFileName.lastIndexOf('/')
  const directory = lastSlashIndex >= 0 ? normalizedFileName.slice(0, lastSlashIndex + 1) : ''
  const rawBaseName = lastSlashIndex >= 0 ? normalizedFileName.slice(lastSlashIndex + 1) : normalizedFileName
  const nextBaseName = rawBaseName.replace(/\.[^/.]+$/, '') || 'white-background'

  return `${directory}${nextBaseName}${normalizedExt}`
}

export function getWhiteBackgroundRelativeFilePath(
  materialId: string,
  skuId: string,
  fileName: string,
): string {
  return `${getWhiteBackgroundRelativeDirectory(materialId, skuId)}/${fileName}`.replace(/\\/g, '/')
}

export function getWhiteBackgroundPreviewRelativeDirectory(materialId: string, skuId: string): string {
  return `${getWhiteBackgroundRelativeDirectory(materialId, skuId)}/preview`.replace(/\\/g, '/')
}

export function getWhiteBackgroundPreviewRelativeFilePath(
  materialId: string,
  skuId: string,
  fileName: string,
): string {
  return `${getWhiteBackgroundPreviewRelativeDirectory(materialId, skuId)}/${replaceWhiteBackgroundFileExtension(fileName)}`.replace(/\\/g, '/')
}

export function getWhiteBackgroundOtherPreviewRelativeFilePath(
  materialId: string,
  skuId: string,
  fileName: string,
): string {
  return `${getWhiteBackgroundPreviewRelativeDirectory(materialId, skuId)}/other/${replaceWhiteBackgroundFileExtension(fileName)}`.replace(/\\/g, '/')
}

export function getWhiteBackgroundPreviewRelativePathFromAssetPath(fileUrl: string): string | null {
  const normalizedFileUrl = String(fileUrl || '').trim().replace(/\\/g, '/')
  if (!normalizedFileUrl || /^https?:\/\//i.test(normalizedFileUrl)) {
    return null
  }

  const normalizedRelativePath = normalizedFileUrl.replace(/^\.?\//, '')
  const segments = normalizedRelativePath.split('/').filter(Boolean)
  const whiteBackgroundIndex = segments.indexOf('white-background')
  if (whiteBackgroundIndex < 0 || !segments[whiteBackgroundIndex + 1]) {
    return null
  }

  const skuRootSegments = segments.slice(0, whiteBackgroundIndex + 2)
  const assetSegments = segments.slice(whiteBackgroundIndex + 2)
  if (assetSegments.length === 0) {
    return null
  }

  if (assetSegments[0] === 'preview') {
    return normalizedRelativePath
  }

  if (assetSegments[0] === 'other') {
    const otherFileName = assetSegments.slice(1).join('/')
    if (!otherFileName) {
      return null
    }

    return `${skuRootSegments.join('/')}/preview/other/${replaceWhiteBackgroundFileExtension(otherFileName)}`.replace(/\\/g, '/')
  }

  return `${skuRootSegments.join('/')}/preview/${replaceWhiteBackgroundFileExtension(assetSegments.join('/'))}`.replace(/\\/g, '/')
}

export function getWhiteBackgroundZipFileName(skuName: string): string {
  return `${skuName}_白底图.zip`
}

export function countWhiteBackgroundFixedViews(
  group?: Pick<GroupedWhiteBackgroundAssets<WhiteBackgroundAssetLike>, 'fixed'> | null,
): number {
  if (!group) {
    return 0
  }

  return STANDARD_MODEL_WHITE_BG_VIEWS.filter((view) => Boolean(group.fixed[view.key])).length
}

export function countWhiteBackgroundOtherImages(
  group?: Pick<GroupedWhiteBackgroundAssets<WhiteBackgroundAssetLike>, 'other'> | null,
): number {
  return group?.other?.length || 0
}

export function countWhiteBackgroundAssets(
  group?: Pick<GroupedWhiteBackgroundAssets<WhiteBackgroundAssetLike>, 'fixed' | 'other' | 'zipAssets'> | null,
): number {
  if (!group) {
    return 0
  }

  return (
    countWhiteBackgroundFixedViews(group) +
    countWhiteBackgroundOtherImages(group) +
    (group.zipAssets?.length || 0)
  )
}

export function hasAnyWhiteBackgroundAssetGroup(
  group?: Pick<GroupedWhiteBackgroundAssets<WhiteBackgroundAssetLike>, 'fixed' | 'other' | 'zipAssets'> | null,
): boolean {
  return countWhiteBackgroundAssets(group) > 0
}

export function getMissingWhiteBackgroundViewsFromAssetGroup(
  group?: Pick<GroupedWhiteBackgroundAssets<WhiteBackgroundAssetLike>, 'fixed'> | null,
): StandardModelWhiteBgView[] {
  if (!group) {
    return [...STANDARD_MODEL_WHITE_BG_VIEWS]
  }

  return STANDARD_MODEL_WHITE_BG_VIEWS.filter((view) => !group.fixed[view.key])
}

export function parseStandardModelWhiteBgAssetType(
  assetType: string,
): ParsedStandardModelWhiteBgAssetType | null {
  const trimmed = String(assetType || '').trim()
  if (!trimmed) {
    return null
  }

  if (trimmed.startsWith(STANDARD_MODEL_WHITE_BG_VIEW_ASSET_TYPE_PREFIX)) {
    const remainder = trimmed.slice(STANDARD_MODEL_WHITE_BG_VIEW_ASSET_TYPE_PREFIX.length)
    const separatorIndex = remainder.indexOf(':')
    if (separatorIndex <= 0) {
      return null
    }

    const skuId = remainder.slice(0, separatorIndex)
    const viewKey = remainder.slice(separatorIndex + 1) as StandardModelWhiteBgKey
    if (!STANDARD_MODEL_WHITE_BG_VIEWS.some((view) => view.key === viewKey)) {
      return null
    }

    return {
      kind: 'view',
      skuId,
      viewKey,
    }
  }

  if (trimmed.startsWith(STANDARD_MODEL_WHITE_BG_OTHER_ASSET_TYPE_PREFIX)) {
    const remainder = trimmed.slice(STANDARD_MODEL_WHITE_BG_OTHER_ASSET_TYPE_PREFIX.length)
    const separatorIndex = remainder.indexOf(':')
    if (separatorIndex <= 0) {
      return null
    }

    const skuId = remainder.slice(0, separatorIndex)
    const index = Number(remainder.slice(separatorIndex + 1))
    if (!Number.isInteger(index) || index <= 0) {
      return null
    }

    return {
      kind: 'other',
      skuId,
      index,
    }
  }

  if (trimmed === LEGACY_STANDARD_MODEL_WHITE_BG_ASSET_TYPE) {
    return {
      kind: 'zip',
      skuId: '',
    }
  }

  if (trimmed.startsWith(LEGACY_STANDARD_MODEL_WHITE_BG_ASSET_TYPE_PREFIX)) {
    return {
      kind: 'zip',
      skuId: trimmed.slice(LEGACY_STANDARD_MODEL_WHITE_BG_ASSET_TYPE_PREFIX.length),
    }
  }

  if (trimmed.startsWith(STANDARD_MODEL_WHITE_BG_ASSET_TYPE_PREFIX)) {
    return {
      kind: 'zip',
      skuId: trimmed.slice(STANDARD_MODEL_WHITE_BG_ASSET_TYPE_PREFIX.length),
    }
  }

  return null
}

export function isWhiteBackgroundAssetType(assetType: string): boolean {
  return parseStandardModelWhiteBgAssetType(assetType) !== null
}

function getAssetSortOrder(asset: WhiteBackgroundAssetLike): number {
  const raw = asset.sortOrder
  if (typeof raw === 'bigint') {
    return Number(raw)
  }
  if (typeof raw === 'string') {
    const parsed = Number(raw)
    return Number.isFinite(parsed) ? parsed : 0
  }
  if (typeof raw === 'number') {
    return Number.isFinite(raw) ? raw : 0
  }
  return 0
}

export function groupWhiteBackgroundAssetsBySku<T extends WhiteBackgroundAssetLike>(
  assets: T[],
): Map<string, GroupedWhiteBackgroundAssets<T>> {
  const groups = new Map<string, GroupedWhiteBackgroundAssets<T>>()

  for (const asset of assets) {
    const parsed = parseStandardModelWhiteBgAssetType(asset.assetType)
    if (!parsed) {
      continue
    }

    const groupSkuId = parsed.skuId
    if (!groupSkuId) {
      continue
    }

    const current = groups.get(groupSkuId) || {
      skuId: groupSkuId,
      fixed: {},
      other: [],
      zipAssets: [],
    }

    if (parsed.kind === 'view' && parsed.viewKey) {
      current.fixed[parsed.viewKey] = asset
    } else if (parsed.kind === 'other') {
      current.other.push(asset)
    } else if (parsed.kind === 'zip') {
      current.zipAssets.push(asset)
    }

    groups.set(groupSkuId, current)
  }

  groups.forEach((group) => {
    group.other.sort((left, right) => getAssetSortOrder(left) - getAssetSortOrder(right))
    group.zipAssets.sort((left, right) => getAssetSortOrder(left) - getAssetSortOrder(right))
  })

  return groups
}

export function hasCompleteWhiteBackgroundAssetGroup(
  group?: Pick<GroupedWhiteBackgroundAssets<WhiteBackgroundAssetLike>, 'fixed'> | null,
): boolean {
  if (!group) {
    return false
  }

  return STANDARD_MODEL_WHITE_BG_VIEWS.every((view) => Boolean(group.fixed[view.key]))
}

export function getNextWhiteBackgroundOtherIndex(
  group?: Pick<GroupedWhiteBackgroundAssets<WhiteBackgroundAssetLike>, 'other'> | null,
): number {
  if (!group?.other?.length) {
    return 1
  }

  let maxIndex = 0

  for (const asset of group.other) {
    const parsed = parseStandardModelWhiteBgAssetType(asset.assetType)
    if (parsed?.kind === 'other' && parsed.index && parsed.index > maxIndex) {
      maxIndex = parsed.index
    }
  }

  return maxIndex + 1
}