// 文件处理函数
import type { BatchFileItem } from './upload-types'
import { BATCH_LIMITS } from './upload-constants'
import { isValidMainFileType, extractSpuFromFileName } from './upload-utils'
import { requiresRenderer, shouldAutoFillGeneral } from '@/lib/material-validation'
import { isBatchVideoMaterialType } from '@/lib/video-material-types'

/**
 * 获取批量上传限制
 */
export function getBatchLimit(materialType: string): number {
  if (materialType === '音乐') return BATCH_LIMITS.music
  if (isBatchVideoMaterialType(materialType)) return BATCH_LIMITS.video
  if (materialType === '3D场景') return BATCH_LIMITS['3d']
  if (materialType === '品牌VI灵感') return BATCH_LIMITS.brandVI
  return Infinity
}

/**
 * 处理批量文件添加
 */
export function createBatchFileItems(
  files: File[],
  materialType: string,
  categoryName: string,
  sceneName: string,
  platformName: string,
  productCategoryName: string,
  renderer: string
): BatchFileItem[] {
  return files.map((file, index) => {
    const extractedSpu = extractSpuFromFileName(file.name)
    
    return {
      id: `${Date.now()}-${index}`,
      file,
      // 首项默认展开；无法确认 SPU 的项也立即展开，避免错误被折叠隐藏。
      expanded: index === 0 || !extractedSpu,
      productModel: extractedSpu,
      productModelSource: extractedSpu ? 'filename' : undefined, // 从文件名提取的SPU，优先级最低，可被覆盖
      categoryName: shouldAutoFillGeneral(materialType) ? '通用' : categoryName,
      sceneName: shouldAutoFillGeneral(materialType) ? '通用' : sceneName,
      platformName: platformName,
      productCategoryName: productCategoryName,
      renderer: requiresRenderer(materialType) ? renderer : undefined,
    }
  })
}

/**
 * 验证并过滤文件
 */
export function validateAndFilterFiles(
  files: File[],
  materialType: string
): { valid: File[]; invalid: File[] } {
  const valid: File[] = []
  const invalid: File[] = []
  
  for (const file of files) {
    if (isValidMainFileType(file, materialType)) {
      valid.push(file)
    } else {
      invalid.push(file)
    }
  }
  
  return { valid, invalid }
}

/**
 * 创建单文件转批量文件的项
 */
export function createBatchItemFromSingleFile(
  file: File,
  materialType: string,
  categoryName: string,
  sceneName: string,
  platformName: string,
  productCategoryName: string,
  renderer: string
): BatchFileItem {
  const extractedSpu = extractSpuFromFileName(file.name)
  
  return {
    id: `${Date.now()}-0`,
    file,
    expanded: true,
    productModel: extractedSpu,
    productModelSource: extractedSpu ? 'filename' : undefined, // 从文件名提取的SPU，优先级最低，可被覆盖
    categoryName: shouldAutoFillGeneral(materialType) ? '通用' : categoryName,
    sceneName: shouldAutoFillGeneral(materialType) ? '通用' : sceneName,
    platformName: platformName,
    productCategoryName: productCategoryName,
    renderer: requiresRenderer(materialType) ? renderer : undefined,
  }
}