import { uploadFileToS3, uploadToS3 } from '@/lib/s3'

export const PUBLIC_DISPLAY_PREFIX = 'public-display'

function normalizeRelativePath(relativePath: string): string {
  return String(relativePath || '')
    .trim()
    .replace(/\\/g, '/')
    .replace(/^\/+/, '')
    .replace(/\/{2,}/g, '/')
}

function normalizeS3PublicDomain(): string | null {
  const rawDomain = String(process.env.S3_PUBLIC_DOMAIN || '').trim()
  if (!rawDomain) {
    return null
  }

  const normalized = rawDomain.match(/^https?:\/\//i) ? rawDomain : `https://${rawDomain}`
  return normalized.replace(/\/+$/, '')
}

export function buildPublicDisplayObjectPath(relativePath: string): string {
  const normalized = normalizeRelativePath(relativePath)
  if (!normalized) {
    return PUBLIC_DISPLAY_PREFIX
  }

  return `${PUBLIC_DISPLAY_PREFIX}/${normalized}`
}

function buildStorageObjectPath(objectPath: string): string {
  const normalizedPrefix = normalizeRelativePath(process.env.S3_FILE_PATH || '')
  const normalizedObjectPath = normalizeRelativePath(objectPath)

  if (!normalizedPrefix) {
    return normalizedObjectPath
  }

  return normalizeRelativePath(`${normalizedPrefix}/${normalizedObjectPath}`)
}

export function buildPublicDisplayUrl(relativePath: string): string | null {
  const publicDomain = normalizeS3PublicDomain()
  const objectPath = buildPublicDisplayObjectPath(relativePath)

  if (!publicDomain || !objectPath) {
    return null
  }

  return `${publicDomain}/${buildStorageObjectPath(objectPath)}`
}

export async function uploadPublicDisplayToS3(
  file: Buffer,
  relativePath: string,
  contentType: string,
): Promise<string> {
  return uploadToS3(file, buildPublicDisplayObjectPath(relativePath), contentType)
}

export async function uploadPublicDisplayFileToS3(
  filePath: string,
  relativePath: string,
  contentType: string,
  expectedSize?: number,
): Promise<string> {
  return uploadFileToS3(
    filePath,
    buildPublicDisplayObjectPath(relativePath),
    contentType,
    expectedSize,
  )
}

export function buildMaterialPublicDisplayPath(fileName: string): string {
  return normalizeRelativePath(`materials/${fileName}`)
}

export function buildTaskDetailPublicDisplayPath(
  materialId: string,
  group: 'main' | 'sku' | 'detail',
  fileName: string,
): string {
  return normalizeRelativePath(`task-detail/${materialId}/${group}/${fileName}`)
}

export function buildCertificateReportPublicDisplayPath(
  materialId: string,
  group: 'pdf' | 'image' | 'preview',
  fileName: string,
): string {
  return normalizeRelativePath(`certificate-report/${materialId}/${group}/${fileName}`)
}

export function buildWhiteBackgroundPublicDisplayPath(
  materialId: string,
  skuId: string,
  fileName: string,
): string {
  return normalizeRelativePath(`white-background/${materialId}/${skuId}/${fileName}`)
}

export function buildWhiteBackgroundPublicDisplayPathFromAssetPath(
  fileUrl?: string | null,
): 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 ||
    whiteBackgroundIndex < 2 ||
    !segments[whiteBackgroundIndex - 1] ||
    !segments[whiteBackgroundIndex + 1]
  ) {
    return null
  }

  const materialId = segments[whiteBackgroundIndex - 1]
  const skuId = segments[whiteBackgroundIndex + 1]
  const fileSegments = segments.slice(whiteBackgroundIndex + 2)

  if (fileSegments.length === 0) {
    return null
  }

  if (fileSegments[0] === 'preview') {
    fileSegments.shift()
  }

  if (fileSegments.length === 0) {
    return null
  }

  return buildWhiteBackgroundPublicDisplayPath(materialId, skuId, fileSegments.join('/'))
}