import {
  preparePerformanceSurveyImagesInBrowser,
  type PerformanceSurveyBrowserProcessedImage,
} from '@/lib/performance-survey-image-browser'

export type TaskDetailAssetKind = 'main' | 'sku' | 'detail'

export type TaskDetailBrowserPreview = PerformanceSurveyBrowserProcessedImage & {
  sourceIndex: number
}

/**
 * 为选图界面生成尺寸受限的小缩略图。
 *
 * 原始 File 绝不能直接挂到 img，否则 60MP 压缩图会在主线程额外解码出数百 MB。
 * 缩略图失败只影响选图展示，真正提交时仍会按任务详情规则重新校验和处理原图。
 */
export async function prepareTaskDetailSelectionThumbnail(
  file: File,
  options: {
    signal?: AbortSignal
    timeoutMs?: number
  } = {},
): Promise<TaskDetailBrowserPreview> {
  const processed = await preparePerformanceSurveyImagesInBrowser(
    [file],
    undefined,
    {
      profile: 'task_detail_thumbnail',
      signal: options.signal,
      timeoutMs: options.timeoutMs,
    },
  )
  const thumbnail = processed.find((item) => item.kind === 'preview')
  if (!thumbnail) throw new Error('浏览器未生成选图缩略图')
  return thumbnail
}

/**
 * 在用户浏览器中逐张生成任务-详情预览。
 *
 * 这里故意一次只传一张源图，避免把整批原图和 Blob 同时留在内存里。
 * 详情长图只上传切片；普通主图/SKU图和短详情图上传一张预览。
 */
export async function prepareTaskDetailImagePreview(
  file: File,
  assetKind: TaskDetailAssetKind,
  onProgress?: (label: string) => void,
  options: {
    signal?: AbortSignal
    timeoutMs?: number
  } = {},
): Promise<TaskDetailBrowserPreview[]> {
  const processed = await preparePerformanceSurveyImagesInBrowser(
    [file],
    onProgress,
    {
      profile: assetKind === 'detail' ? 'task_detail_detail' : 'task_detail_preview',
      signal: options.signal,
      timeoutMs: options.timeoutMs,
    },
  )

  if (assetKind === 'detail' && processed.some((item) => item.sliceCount > 1)) {
    return processed.filter((item) => item.kind === 'slice')
  }

  const preview = processed.filter((item) => item.kind === 'preview')
  if (preview.length > 0) return preview

  // 极旧浏览器/worker 兼容：没有 preview 时至少保留第一张切片，不能因预览缺失阻断原图上传。
  return processed.filter((item) => item.kind === 'slice').slice(0, 1)
}