/**
 * 素材选择器 — V21 设计系统
 * 支持批量选择、拖拽排序、预览缩略图、质量分筛选、视图切换
 *
 * 功能：
 * - 批量选择：checkbox 多选 + 全选/反选 + Shift 连选
 * - 拖拽排序：HTML5 DnD，已选素材可拖拽调整顺序
 * - 预览缩略图：悬浮放大预览（视频显示时长角标）
 * - 筛选增强：类型筛选 + 质量分筛选
 * - 视图切换：网格视图 / 列表视图
 */
import React, { useCallback } from "react"
import "./AssetSelector.css"
import type { AssetSelectorProps } from "./types"
import useAssetFilter from "./hooks/useAssetFilter"
import useAssetSelection from "./hooks/useAssetSelection"
import useDragReorder from "./hooks/useDragReorder"
import useAssetPreview from "./hooks/useAssetPreview"
import SelectorToolbar from "./SelectorToolbar"
import SelectorBatchBar from "./SelectorBatchBar"
import AssetCard from "./AssetCard"
import AssetListItem from "./AssetListItem"
import PreviewOverlay from "./PreviewOverlay"
import EmptyState from "./EmptyState"
import type { MediaAsset } from "@/api/template-editor"

const AssetSelector: React.FC<AssetSelectorProps> = ({
  assets,
  selectedIds = [],
  onSelectionChange,
  onAssetDragStart,
  onReorder,
  showQualityFilter = true,
  showBatchSelect = true,
  compact = false,
}) => {
  // 搜索 & 筛选
  const {
    searchText,
    filterType,
    filterQuality,
    viewMode,
    filteredAssets,
    setSearchText,
    setFilterType,
    setFilterQuality,
    setViewMode,
  } = useAssetFilter(assets)

  // 选中操作
  const { selectedSet, toggleSelect, clearSelection } = useAssetSelection({
    filteredAssets,
    selectedIds,
    onSelectionChange,
  })

  // 拖拽排序
  const { dragIdx, dragOverIdx, handleDragStart, handleDragOver, handleDrop, handleDragEnd } =
    useDragReorder({
      filteredAssets,
      selectedIds,
      onAssetDragStart,
      onReorder,
    })

  // 悬浮预览
  const { previewAsset, previewPos, handleMouseEnter, handleMouseLeave } = useAssetPreview()

  /* ── 点击卡片 ── */
  const handleCardClick = useCallback(
    (asset: MediaAsset, idx: number, e: React.MouseEvent) => {
      const target = e.target as HTMLElement
      if (target.closest("[data-checkbox]")) return
      toggleSelect(asset, idx, e.shiftKey)
    },
    [toggleSelect],
  )

  const hasSelection = selectedIds.length > 0

  return (
    <div className="as-container">
      {/* 工具栏 */}
      <SelectorToolbar
        searchText={searchText}
        filterType={filterType}
        filterQuality={filterQuality}
        viewMode={viewMode}
        showQualityFilter={showQualityFilter}
        onSearchChange={setSearchText}
        onTypeChange={setFilterType}
        onQualityChange={setFilterQuality}
        onViewModeChange={setViewMode}
      />

      {/* 批量操作栏 */}
      {showBatchSelect && hasSelection && (
        <SelectorBatchBar selectedCount={selectedIds.length} onClear={clearSelection} />
      )}

      {/* 素材列表 */}
      <div className="as-body">
        {filteredAssets.length === 0 ? (
          <EmptyState />
        ) : viewMode === "grid" ? (
          /* 网格视图 */
          <div className={`as-grid${compact ? " compact" : ""}`}>
            {filteredAssets.map((asset, idx) => (
              <AssetCard
                key={asset.id}
                asset={asset}
                isSelected={selectedSet.has(asset.id)}
                isDragging={dragIdx === idx}
                isDragOver={dragOverIdx === idx}
                showCheckbox={showBatchSelect}
                compact={compact}
                onToggleSelect={(a, shiftKey) => toggleSelect(a, idx, shiftKey)}
                onCardClick={(a, e) => handleCardClick(a, idx, e)}
                onDragStart={(e) => handleDragStart(e, idx)}
                onDragOver={(e) => handleDragOver(e, idx)}
                onDrop={(e) => handleDrop(e, idx)}
                onDragEnd={handleDragEnd}
                onMouseEnter={(e) => handleMouseEnter(asset, e)}
                onMouseLeave={handleMouseLeave}
              />
            ))}
          </div>
        ) : (
          /* 列表视图 */
          <div className="as-list">
            {filteredAssets.map((asset, idx) => (
              <AssetListItem
                key={asset.id}
                asset={asset}
                isSelected={selectedSet.has(asset.id)}
                isDragging={dragIdx === idx}
                isDragOver={dragOverIdx === idx}
                showCheckbox={showBatchSelect}
                onToggleSelect={(a, shiftKey) => toggleSelect(a, idx, shiftKey)}
                onCardClick={(a, e) => handleCardClick(a, idx, e)}
                onDragStart={(e) => handleDragStart(e, idx)}
                onDragOver={(e) => handleDragOver(e, idx)}
                onDrop={(e) => handleDrop(e, idx)}
                onDragEnd={handleDragEnd}
                onMouseEnter={(e) => handleMouseEnter(asset, e)}
                onMouseLeave={handleMouseLeave}
              />
            ))}
          </div>
        )}
      </div>

      {/* 悬浮预览 */}
      {previewAsset && <PreviewOverlay asset={previewAsset} position={previewPos} />}
    </div>
  )
}

export default AssetSelector