'use client'

import Image from 'next/image'
import { PREVIEW_OPTIONAL_TYPES } from './upload-constants'
import {
  dropZoneActiveClass,
  dropZoneIdleClass,
  fieldHintClass,
  fieldLabelClass,
} from './upload-field-styles'
import VideoPreviewImageUpload from './VideoPreviewImageUpload'
import { isVideoMaterialType } from '@/lib/video-material-types'

interface PreviewImageUploadProps {
  materialType: string
  previewImages: File[]
  previewUrls: string[]
  isPreviewDragging: boolean
  previewInputRef: React.RefObject<HTMLInputElement>
  previewDropZoneRef: React.RefObject<HTMLDivElement>
  disabled?: boolean
  onPreviewChange: (e: React.ChangeEvent<HTMLInputElement>) => void
  onPreviewDragEnter: (e: React.DragEvent) => void
  onPreviewDragLeave: (e: React.DragEvent) => void
  onPreviewDragOver: (e: React.DragEvent) => void
  onPreviewDrop: (e: React.DragEvent) => void
  onRemovePreviewImage: (index: number) => void
  onVideoPreviewSelect: (file: File) => void | Promise<void>
  onValidationError: (message: string) => void
  onVideoPreviewProcessingChange?: (processing: boolean) => void
}

export default function PreviewImageUpload({
  materialType,
  previewImages,
  previewUrls,
  isPreviewDragging,
  previewInputRef,
  previewDropZoneRef,
  disabled = false,
  onPreviewChange,
  onPreviewDragEnter,
  onPreviewDragLeave,
  onPreviewDragOver,
  onPreviewDrop,
  onRemovePreviewImage,
  onVideoPreviewSelect,
  onValidationError,
  onVideoPreviewProcessingChange,
}: PreviewImageUploadProps) {
  if (isVideoMaterialType(materialType)) {
    return (
      <VideoPreviewImageUpload
        previewUrl={previewUrls[0]}
        fileName={previewImages[0]?.name}
        fileSize={previewImages[0]?.size}
        disabled={disabled}
        onFileSelect={onVideoPreviewSelect}
        onRemove={() => onRemovePreviewImage(0)}
        onValidationError={onValidationError}
        onProcessingChange={onVideoPreviewProcessingChange}
      />
    )
  }

  return (
    <div>
      <label className={fieldLabelClass}>
        预览图片
        {PREVIEW_OPTIONAL_TYPES.includes(materialType) ? '（可选）' : ' *'}
      </label>
      <div
        ref={previewDropZoneRef}
        aria-disabled={disabled}
        className={`p-4 ${
          disabled ? 'cursor-not-allowed opacity-60' : ''
        } ${isPreviewDragging ? dropZoneActiveClass : dropZoneIdleClass}`}
        onDragEnter={onPreviewDragEnter}
        onDragLeave={onPreviewDragLeave}
        onDragOver={onPreviewDragOver}
        onDrop={onPreviewDrop}
      >
        <input
          ref={previewInputRef}
          type="file"
          onChange={onPreviewChange}
          accept="image/*"
          multiple
          className="hidden"
          disabled={disabled}
        />
        <div className="grid grid-cols-2 gap-4 md:grid-cols-4">
          {previewUrls.map((url, index) => (
            <div key={index} className="group relative">
              <div className="relative h-32 w-full overflow-hidden rounded-[8px] border border-[#e7e8ea]">
                <Image
                  src={url}
                  alt={`预览图 ${index + 1}`}
                  fill
                  unoptimized
                  className="object-cover"
                />
                {index === 0 && (
                  <div className="absolute left-1 top-1 bg-[#1a1c1d] px-2 py-0.5 text-[11px] tracking-[-0.02em] text-white">
                    主预览图
                  </div>
                )}
              </div>
              <button
                type="button"
                onClick={() => onRemovePreviewImage(index)}
                disabled={disabled}
                aria-label={`移除预览图 ${index + 1}`}
                className="absolute -right-2 -top-2 flex h-6 w-6 items-center justify-center rounded-full bg-[#1a1c1d] text-white opacity-0 transition-opacity group-hover:opacity-100 focus-visible:opacity-100 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#1a1c1d]/70"
              >
                ×
              </button>
            </div>
          ))}
          <button
            type="button"
            onClick={() => previewInputRef.current?.click()}
            disabled={disabled}
            className="group flex h-32 w-full items-center justify-center rounded-[8px] border border-dashed border-[#e7e8ea] bg-white transition-colors hover:border-[#1a1c1d] focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#1a1c1d]/70 focus-visible:ring-offset-2"
          >
            <svg className="h-8 w-8 text-[#86898e] transition-colors group-hover:text-[#1a1c1d]" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M12 4v16m8-8H4" />
            </svg>
          </button>
        </div>
        <div className="mt-3 space-y-1">
          <p className={fieldHintClass}>
            支持 JPG、PNG、WebP，可一次选多张或拖进来。
          </p>
          <p className={fieldHintClass}>
            第一张图会作为主预览图。
          </p>
        </div>
      </div>
    </div>
  )
}