'use client'

import { useMemo, useState } from 'react'
import Image from 'next/image'
import {
  STANDARD_MODEL_WHITE_BG_VIEWS,
  type StandardModelWhiteBgKey,
} from '@/lib/standard-model-white-background'
import { hasDragLeftDropZone, prepareFileDrag } from './drag-drop-utils'

interface OtherImagePreview {
  id: string
  url: string
  name: string
}

interface StandardModelWhiteBackgroundUploadProps {
  imageUrls: Partial<Record<StandardModelWhiteBgKey, string>>
  otherImages: OtherImagePreview[]
  uploading?: boolean
  error?: string
  onSelectImage: (key: StandardModelWhiteBgKey, file: File) => void
  onRemoveImage: (key: StandardModelWhiteBgKey) => void
  onSelectOtherImages: (files: FileList | File[]) => void
  onRemoveOtherImage: (id: string) => void
}

export default function StandardModelWhiteBackgroundUpload({
  imageUrls,
  otherImages,
  uploading = false,
  error,
  onSelectImage,
  onRemoveImage,
  onSelectOtherImages,
  onRemoveOtherImage,
}: StandardModelWhiteBackgroundUploadProps) {
  const [draggingKey, setDraggingKey] = useState<StandardModelWhiteBgKey | null>(null)
  const [isOtherDragging, setIsOtherDragging] = useState(false)

  const uploadedRequiredCount = useMemo(
    () => STANDARD_MODEL_WHITE_BG_VIEWS.filter((view) => !!imageUrls[view.key]).length,
    [imageUrls],
  )

  const missingLabels = useMemo(
    () =>
      STANDARD_MODEL_WHITE_BG_VIEWS
        .filter((view) => !imageUrls[view.key])
        .map((view) => view.label),
    [imageUrls],
  )

  const handleDragEnter = (event: React.DragEvent, key: StandardModelWhiteBgKey) => {
    prepareFileDrag(event, uploading)
    if (uploading) return
    setDraggingKey(key)
  }

  const handleDragLeave = (event: React.DragEvent, key: StandardModelWhiteBgKey) => {
    event.preventDefault()
    event.stopPropagation()

    if (hasDragLeftDropZone(event)) {
      if (draggingKey === key) {
        setDraggingKey(null)
      }
    }
  }

  const handleDragOver = (event: React.DragEvent) => {
    prepareFileDrag(event, uploading)
  }

  const handleDrop = (event: React.DragEvent, key: StandardModelWhiteBgKey) => {
    prepareFileDrag(event, uploading)
    setDraggingKey(null)
    if (uploading) return

    const file = event.dataTransfer.files?.[0]
    if (!file) {
      return
    }

    onSelectImage(key, file)
  }

  const handleOtherDrop = (event: React.DragEvent) => {
    prepareFileDrag(event, uploading)
    setIsOtherDragging(false)
    if (uploading) return

    const files = event.dataTransfer.files
    if (!files || files.length === 0) {
      return
    }

    onSelectOtherImages(files)
  }

  return (
    <div className="rounded-2xl border border-gray-200 bg-white p-5 shadow-sm dark:border-gray-700 dark:bg-gray-800">
      <div className="flex flex-wrap items-center gap-2">
        <span className="inline-flex items-center rounded-full bg-blue-50 px-3 py-1 text-xs font-medium text-blue-700 dark:bg-blue-900/30 dark:text-blue-300">
          固定角度 {uploadedRequiredCount} / {STANDARD_MODEL_WHITE_BG_VIEWS.length}
        </span>
        <span className="inline-flex items-center rounded-full bg-gray-100 px-3 py-1 text-xs font-medium text-gray-700 dark:bg-gray-700 dark:text-gray-200">
          可分次补传
        </span>
        {otherImages.length > 0 && (
          <span className="inline-flex items-center rounded-full bg-gray-100 px-3 py-1 text-xs font-medium text-gray-700 dark:bg-gray-700 dark:text-gray-200">
            其他图片 {otherImages.length} 张
          </span>
        )}
        {uploading && (
          <span className="inline-flex items-center rounded-full bg-amber-50 px-3 py-1 text-xs font-medium text-amber-700 dark:bg-amber-900/30 dark:text-amber-300">
            上传处理中
          </span>
        )}
      </div>

      <div className="mt-3 rounded-xl border border-dashed border-gray-200 bg-gray-50/80 px-3 py-2 text-xs text-gray-600 dark:border-gray-700 dark:bg-gray-900/30 dark:text-gray-300">
        {missingLabels.length > 0
          ? `未上传：${missingLabels.join('、')}（可先保存，后续再补）`
          : '8 张固定角度已齐，可直接保存。'}
      </div>

      {error && (
        <div className="mt-4 rounded-xl border border-red-200 bg-red-50 px-3 py-2 text-sm text-red-600 dark:border-red-900/40 dark:bg-red-900/20 dark:text-red-300">
          {error}
        </div>
      )}

      <div className="mt-5">
        <div className="mb-3 flex items-center justify-between">
          <h4 className="text-sm font-semibold text-gray-900 dark:text-white">固定角度</h4>
          <span className="text-xs text-gray-500 dark:text-gray-400">可选，建议补齐 8 张</span>
        </div>

        <div className="grid grid-cols-2 gap-4 xl:grid-cols-4">
          {STANDARD_MODEL_WHITE_BG_VIEWS.map((view) => {
            const inputId = `white-bg-${view.key}`
            const imageUrl = imageUrls[view.key]
            const isDragging = draggingKey === view.key

            return (
              <div key={view.key} className="space-y-2">
                <div className="flex items-center justify-between">
                  <p className="text-xs font-medium text-gray-700 dark:text-gray-200">{view.label}</p>
                  <span className="inline-flex items-center rounded-full bg-gray-100 px-2 py-0.5 text-[10px] font-medium text-gray-600 dark:bg-gray-700 dark:text-gray-300">
                    可选
                  </span>
                </div>

                <input
                  id={inputId}
                  type="file"
                  accept="image/*"
                  className="hidden"
                  disabled={uploading}
                  onChange={(event) => {
                    const file = event.target.files?.[0]
                    if (file) {
                      onSelectImage(view.key, file)
                    }
                    event.currentTarget.value = ''
                  }}
                />

                {/* biome-ignore lint/a11y/noStaticElementInteractions: 上传槽位需要拖拽和点击交互 */}
                <label
                  htmlFor={inputId}
                  aria-disabled={uploading}
                  className={`group block rounded-2xl border-2 border-dashed p-3 transition-colors ${
                    uploading ? 'cursor-not-allowed opacity-60' : 'cursor-pointer'
                  } ${
                    isDragging
                      ? 'border-blue-500 bg-blue-50 dark:bg-blue-900/20'
                      : imageUrl
                        ? 'border-gray-200 bg-gray-50 dark:border-gray-700 dark:bg-gray-900/30'
                        : 'border-gray-300 bg-gray-50 dark:border-gray-600 dark:bg-gray-800/50 hover:border-gray-400 dark:hover:border-gray-500'
                  }`}
                  onDragEnter={(event) => handleDragEnter(event, view.key)}
                  onDragLeave={(event) => handleDragLeave(event, view.key)}
                  onDragOver={handleDragOver}
                  onDrop={(event) => handleDrop(event, view.key)}
                >
                  {imageUrl ? (
                    <div className="space-y-2">
                      <div className="relative h-36 overflow-hidden rounded-xl border border-gray-200 dark:border-gray-700">
                        <Image
                          src={imageUrl}
                          alt={view.label}
                          fill
                          unoptimized
                          className="object-cover"
                        />
                        <button
                          type="button"
                          aria-label={`删除${view.label}`}
                          disabled={uploading}
                          className="absolute right-2 top-2 inline-flex h-7 w-7 items-center justify-center rounded-full bg-black/55 text-sm font-semibold text-white transition hover:bg-black/70"
                          onClick={(event) => {
                            event.preventDefault()
                            event.stopPropagation()
                            onRemoveImage(view.key)
                          }}
                        >
                          ×
                        </button>
                      </div>
                      <p className="text-[11px] text-gray-500 dark:text-gray-400">点击或拖拽可重新上传</p>
                    </div>
                  ) : (
                    <div className="flex h-36 flex-col items-center justify-center rounded-xl bg-white text-center dark:bg-gray-800">
                      <svg className="h-6 w-6 text-gray-400 group-hover:text-gray-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4v16m8-8H4" />
                      </svg>
                      <span className="mt-2 text-xs text-gray-500 dark:text-gray-400">拖拽或点击上传</span>
                    </div>
                  )}
                </label>
              </div>
            )
          })}
        </div>
      </div>

      <div className="mt-6 border-t border-gray-200 pt-5 dark:border-gray-700">
        <div className="mb-3 flex items-center justify-between">
          <h4 className="text-sm font-semibold text-gray-900 dark:text-white">其他图片</h4>
          <span className="text-xs text-gray-500 dark:text-gray-400">可选，多张</span>
        </div>

        <input
          id="white-bg-other-images"
          type="file"
          accept="image/*"
          multiple
          className="hidden"
          disabled={uploading}
          onChange={(event) => {
            if (event.target.files && event.target.files.length > 0) {
              onSelectOtherImages(event.target.files)
            }
            event.currentTarget.value = ''
          }}
        />

        {/* biome-ignore lint/a11y/noStaticElementInteractions: 其他图片区需要拖拽上传 */}
        <label
          htmlFor="white-bg-other-images"
          aria-disabled={uploading}
          className={`block min-h-28 rounded-2xl border-2 border-dashed px-4 py-5 transition-colors ${
            uploading ? 'cursor-not-allowed opacity-60' : 'cursor-pointer'
          } ${
            isOtherDragging
              ? 'border-blue-500 bg-blue-50 dark:bg-blue-900/20'
              : 'border-gray-300 bg-gray-50 dark:border-gray-600 dark:bg-gray-800/40 hover:border-gray-400 dark:hover:border-gray-500'
          }`}
          onDragEnter={(event) => {
            prepareFileDrag(event, uploading)
            if (uploading) return
            setIsOtherDragging(true)
          }}
          onDragLeave={(event) => {
            event.preventDefault()
            event.stopPropagation()
            if (hasDragLeftDropZone(event)) {
              setIsOtherDragging(false)
            }
          }}
          onDragOver={handleDragOver}
          onDrop={handleOtherDrop}
        >
          {otherImages.length > 0 ? (
            <div className="space-y-4">
              <div className="grid grid-cols-2 gap-4 xl:grid-cols-4">
                {otherImages.map((image) => (
                  <div key={image.id} className="rounded-2xl border border-gray-200 bg-white/80 p-3 dark:border-gray-700 dark:bg-gray-900/40">
                    <div className="relative h-32 overflow-hidden rounded-xl border border-gray-200 dark:border-gray-700">
                      <Image
                        src={image.url}
                        alt={image.name}
                        fill
                        unoptimized
                        className="object-cover"
                      />
                      <button
                        type="button"
                        aria-label={`删除${image.name}`}
                        disabled={uploading}
                        className="absolute right-2 top-2 inline-flex h-7 w-7 items-center justify-center rounded-full bg-black/55 text-sm font-semibold text-white transition hover:bg-black/70"
                        onClick={(event) => {
                          event.preventDefault()
                          event.stopPropagation()
                          onRemoveOtherImage(image.id)
                        }}
                      >
                        ×
                      </button>
                    </div>
                    <p className="mt-2 truncate text-xs text-gray-500 dark:text-gray-400">{image.name}</p>
                  </div>
                ))}
                <div className="flex h-full min-h-[10rem] flex-col items-center justify-center rounded-2xl border border-dashed border-gray-300 bg-white/70 px-4 text-center dark:border-gray-600 dark:bg-gray-800/50">
                  <svg className="h-6 w-6 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M7 16a4 4 0 01-.88-7.903A5 5 0 1115.9 6L16 6a5 5 0 011 9.9M15 13l-3-3m0 0l-3 3m3-3v12" />
                  </svg>
                  <span className="mt-2 text-sm font-medium text-gray-700 dark:text-gray-200">继续添加</span>
                  <span className="mt-1 text-xs text-gray-500 dark:text-gray-400">拖拽或点击追加</span>
                </div>
              </div>
            </div>
          ) : (
            <div className="flex min-h-28 flex-col items-center justify-center text-center">
              <svg className="h-6 w-6 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M7 16a4 4 0 01-.88-7.903A5 5 0 1115.9 6L16 6a5 5 0 011 9.9M15 13l-3-3m0 0l-3 3m3-3v12" />
              </svg>
              <span className="mt-2 text-sm font-medium text-gray-700 dark:text-gray-200">拖拽图片到这里，或点击追加</span>
              <span className="mt-1 text-xs text-gray-500 dark:text-gray-400">支持一次添加多张其他图片</span>
            </div>
          )}
        </label>
      </div>
    </div>
  )
}