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unstyled }: KanbanCardProps) {\n  const { setDraggedCard, setDragSource } = useKanban();\n  const columnId = useKanbanColumn();\n\n  const handleDragStart = useCallback(() => {\n    setDraggedCard(id);\n    setDragSource(columnId);\n  }, [id, columnId, setDraggedCard, setDragSource]);\n\n  const handleDragEnd = useCallback(() => {\n    setDraggedCard(null);\n    setDragSource(null);\n  }, [setDraggedCard, setDragSource]);\n\n  return (\n    <div\n      data-react-fancy-kanban-card=\"\"\n      draggable\n      onDragStart={handleDragStart}\n      onDragEnd={handleDragEnd}\n      className={cn(\n        // Drag affordance — kept even when unstyled so users still see grab cursors.\n        \"cursor-grab active:cursor-grabbing\",\n        !unstyled && DEFAULT_CARD_CLASSES,\n        className,\n      )}\n    >\n      {children}\n    </div>\n  );\n}\n\nKanbanCard.displayName = \"KanbanCard\";\n","import { Children, isValidElement, useCallback, useEffect, useRef, useState } from \"react\";\nimport { cn } from \"../../utils/cn\";\nimport { KanbanCard } from \"./KanbanCard\";\nimport { useKanban, KanbanColumnContext } from \"./Kanban.context\";\nimport type { KanbanColumnProps } from \"./Kanban.types\";\n\nconst DEFAULT_COLUMN_CLASSES =\n  \"min-h-[200px] w-72 rounded-xl bg-zinc-50 p-3 dark:bg-zinc-800/50\";\n\n/**\n * Deep-recurse through the children tree counting Kanban.Card descendants\n * regardless of wrapping (Fragment, ContextMenu, motion.div, custom HOCs,\n * etc.). Used by `hideWhenEmpty` and the WIP-limit count chip.\n */\nfunction countCardChildren(children: React.ReactNode): number {\n  let n = 0;\n  Children.forEach(children, (child) => {\n    if (!isValidElement(child)) return;\n    if (child.type === KanbanCard) {\n      n += 1;\n      return;\n    }\n    const inner = (child.props as { children?: React.ReactNode }).children;\n    if (inner !== undefined) n += countCardChildren(inner);\n  });\n  return n;\n}\n\n/**\n * Find the document-order index of a Kanban.Card with the given id, deep-\n * recursing through wrappers. Used by same-column reorder to compute the\n * post-removal insert position.\n */\nfunction findCardIndex(children: React.ReactNode, cardId: string): number {\n  let idx = -1;\n  let i = 0;\n  function walk(nodes: React.ReactNode): void {\n    Children.forEach(nodes, (child) => {\n      if (idx !== -1) return;\n      if (!isValidElement(child)) return;\n      if (child.type === KanbanCard) {\n        if ((child.props as { id?: string }).id === cardId) idx = i;\n        i += 1;\n        return;\n      }\n      const inner = (child.props as { children?: React.ReactNode }).children;\n      if (inner !== undefined) walk(inner);\n    });\n  }\n  walk(children);\n  return idx;\n}\n\nexport function KanbanColumn({\n  children,\n  id,\n  title,\n  className,\n  unstyled,\n  wipLimit,\n  hideWhenEmpty,\n}: KanbanColumnProps) {\n  const { onCardMove, draggedCard, dragSource, registerColumn } = useKanban();\n  const [dragOver, setDragOver] = useState(false);\n  const [dropIndex, setDropIndex] = useState<number | null>(null);\n  const [dropY, setDropY] = useState<number | null>(null);\n  const cardsRef = useRef<HTMLDivElement>(null);\n\n  useEffect(() => registerColumn(id), [id, registerColumn]);\n\n  /**\n   * Compute drop position from mouse Y. Walks the *DOM* (not the React\n   * tree) and queries `[data-react-fancy-kanban-card]` so wrappers\n   * (ContextMenu, custom Card surfaces, motion.div) don't break the\n   * indicator placement.\n   */\n  const updateDrop = useCallback((clientY: number) => {\n    const container = cardsRef.current;\n    if (!container) {\n      setDropIndex(null);\n      setDropY(null);\n      return;\n    }\n\n    // Limit to cards belonging to THIS column — important if a card\n    // happens to nest a sub-board (rare, but cheap to defend).\n    const all = Array.from(\n      container.querySelectorAll<HTMLElement>(\n        \"[data-react-fancy-kanban-card]\",\n      ),\n    );\n    const cards = all.filter(\n      (el) =>\n        el.closest(\"[data-react-fancy-kanban-column]\") ===\n        cardsRef.current?.closest(\"[data-react-fancy-kanban-column]\"),\n    );\n\n    const containerRect = container.getBoundingClientRect();\n\n    if (cards.length === 0) {\n      setDropIndex(0);\n      setDropY(0);\n      return;\n    }\n\n    let idx = cards.length;\n    let yRel = 0;\n    for (let i = 0; i < cards.length; i++) {\n      const rect = cards[i]!.getBoundingClientRect();\n      if (clientY < rect.top + rect.height / 2) {\n        idx = i;\n        yRel = rect.top - containerRect.top;\n        break;\n      }\n    }\n    if (idx === cards.length) {\n      const last = cards[cards.length - 1]!.getBoundingClientRect();\n      yRel = last.bottom - containerRect.top;\n    }\n\n    setDropIndex(idx);\n    setDropY(yRel);\n  }, []);\n\n  const handleDragOver = useCallback(\n    (e: React.DragEvent) => {\n      // Only react to card drags. Column drags are handled by the root.\n      if (!draggedCard) return;\n      e.preventDefault();\n      e.stopPropagation();\n      setDragOver(true);\n      updateDrop(e.clientY);\n    },\n    [draggedCard, updateDrop],\n  );\n\n  const handleDragLeave = useCallback((e: React.DragEvent) => {\n    if (e.currentTarget.contains(e.relatedTarget as Node | null)) return;\n    setDragOver(false);\n    setDropIndex(null);\n    setDropY(null);\n  }, []);\n\n  const handleDrop = useCallback(\n    (e: React.DragEvent) => {\n      if (!draggedCard) return;\n      e.preventDefault();\n      e.stopPropagation();\n      const target = dropIndex ?? 0;\n\n      if (dragSource) {\n        let finalIdx = target;\n        if (dragSource === id) {\n          const srcIdx = findCardIndex(children, draggedCard);\n          if (srcIdx !== -1 && target > srcIdx) finalIdx = target - 1;\n          if (srcIdx === finalIdx) {\n            // No-op\n            setDragOver(false);\n            setDropIndex(null);\n            setDropY(null);\n            return;\n          }\n        }\n        onCardMove?.(draggedCard, dragSource, id, finalIdx);\n      }\n\n      setDragOver(false);\n      setDropIndex(null);\n      setDropY(null);\n    },\n    [draggedCard, dragSource, dropIndex, id, onCardMove, children],\n  );\n\n  const cardCount = countCardChildren(children);\n  if (hideWhenEmpty && cardCount === 0 && !draggedCard) return null;\n\n  const showIndicator =\n    draggedCard !== null &&\n    dropIndex !== null &&\n    dropY !== null &&\n    dragOver;\n\n  const overWip = wipLimit !== undefined && cardCount > wipLimit;\n\n  return (\n    <KanbanColumnContext.Provider value={id}>\n      <div\n        data-react-fancy-kanban-column=\"\"\n        data-column-id={id}\n        role=\"group\"\n        aria-label={title}\n        onDrop={handleDrop}\n        onDragOver={handleDragOver}\n        onDragLeave={handleDragLeave}\n        className={cn(\n          \"flex flex-col\",\n          !unstyled && DEFAULT_COLUMN_CLASSES,\n          dragOver && \"ring-2 ring-blue-400 ring-inset\",\n          className,\n        )}\n      >\n        {title && (\n          <h3 className=\"mb-3 flex items-center gap-2 text-sm font-semibold text-zinc-600 dark:text-zinc-400\">\n            <span className=\"flex-1\">{title}</span>\n            <span\n              className={cn(\n                \"rounded-full px-1.5 py-0.5 text-[10px] font-semibold\",\n                overWip\n                  ? \"bg-red-100 text-red-700 dark:bg-red-900/40 dark:text-red-300\"\n                  : \"bg-zinc-200 text-zinc-700 dark:bg-zinc-700 dark:text-zinc-300\",\n              )}\n            >\n              {cardCount}\n              {wipLimit !== undefined ? `/${wipLimit}` : \"\"}\n            </span>\n          </h3>\n        )}\n\n        {/* Cards container — `relative` so the drop indicator overlay\n            can position itself in the container's coordinate space.\n            Children are rendered untouched so any wrapper hierarchy\n            (ContextMenu, motion.div, etc.) keeps working. */}\n        <div ref={cardsRef} className=\"relative flex flex-1 flex-col gap-2\">\n          {children}\n\n          {showIndicator && (\n            <div\n              data-react-fancy-kanban-drop-indicator=\"\"\n              style={{ top: dropY }}\n              className=\"pointer-events-none absolute left-0 right-0 h-0.5 -translate-y-1/2 rounded-full bg-blue-500/80 shadow-[0_0_0_3px_rgba(59,130,246,0.15)]\"\n            />\n          )}\n        </div>\n      </div>\n    </KanbanColumnContext.Provider>\n  );\n}\n\nKanbanColumn.displayName = \"KanbanColumn\";\n","import { useCallback } from \"react\";\nimport { cn } from \"../../utils/cn\";\nimport { useKanban, useKanbanColumn } from \"./Kanban.context\";\nimport type { KanbanColumnHandleProps } from \"./Kanban.types\";\n\n/**\n * Drag handle for column reordering.\n *\n * Mount inside a `Kanban.Column` to make that column draggable. The\n * column's parent `Kanban` listens for the drop and surfaces the new\n * position via `onColumnMove`. Without a handle, columns are static.\n *\n * Typically wrapped around the column header so users grab the title\n * to reorder; can also be a small grip icon.\n */\nexport function KanbanColumnHandle({\n  children,\n  className,\n}: KanbanColumnHandleProps) {\n  const { setDraggedColumn } = useKanban();\n  const columnId = useKanbanColumn();\n\n  const handleDragStart = useCallback(\n    (e: React.DragEvent) => {\n      // Set a dataTransfer payload so the browser permits the drag — some\n      // browsers refuse if dataTransfer is empty.\n      e.dataTransfer.effectAllowed = \"move\";\n      e.dataTransfer.setData(\"text/plain\", columnId);\n      e.stopPropagation();\n      setDraggedColumn(columnId);\n    },\n    [columnId, setDraggedColumn],\n  );\n\n  const handleDragEnd = useCallback(() => {\n    setDraggedColumn(null);\n  }, [setDraggedColumn]);\n\n  return (\n    <div\n      draggable\n      onDragStart={handleDragStart}\n      onDragEnd={handleDragEnd}\n      data-react-fancy-kanban-column-handle=\"\"\n      className={cn(\n        \"cursor-grab active:cursor-grabbing select-none\",\n        className,\n      )}\n    >\n      {children}\n    </div>\n  );\n}\n\nKanbanColumnHandle.displayName = \"KanbanColumnHandle\";\n","import { useCallback, useMemo, useRef, useState } from \"react\";\nimport { cn } from \"../../utils/cn\";\nimport { KanbanContext } from \"./Kanban.context\";\nimport { KanbanColumn } from \"./KanbanColumn\";\nimport { KanbanCard } from \"./KanbanCard\";\nimport { KanbanColumnHandle } from \"./KanbanColumnHandle\";\nimport type { KanbanProps } from \"./Kanban.types\";\n\n/**\n * Kanban board.\n *\n * Compound:\n *   <Kanban onCardMove={...} onColumnMove={...}>\n *     <Kanban.Column id=\"todo\" wipLimit={4}>\n *       <Kanban.ColumnHandle>...header...</Kanban.ColumnHandle>  // optional\n *       <Kanban.Card id=\"...\">...</Kanban.Card>\n *     </Kanban.Column>\n *   </Kanban>\n *\n * Cards drag between columns AND within a column. Drop position is\n * computed from mouse Y at hover time and surfaced via the `toIndex`\n * argument on `onCardMove`.\n *\n * Columns drag horizontally to reorder when a `<Kanban.ColumnHandle>`\n * is mounted inside them. The root computes the drop index from\n * mouse X and surfaces it via `onColumnMove`.\n */\nfunction KanbanRoot({\n  children,\n  onCardMove,\n  onColumnMove,\n  className,\n}: KanbanProps) {\n  const [draggedCard, setDraggedCard] = useState<string | null>(null);\n  const [dragSource, setDragSource] = useState<string | null>(null);\n  const [draggedColumn, setDraggedColumn] = useState<string | null>(null);\n\n  const orderRef = useRef<string[]>([]);\n  const [columnIds, setColumnIds] = useState<string[]>([]);\n\n  const registerColumn = useCallback((id: string) => {\n    if (!orderRef.current.includes(id)) {\n      orderRef.current = [...orderRef.current, id];\n      setColumnIds(orderRef.current);\n    }\n    return () => {\n      orderRef.current = orderRef.current.filter((x) => x !== id);\n      setColumnIds(orderRef.current);\n    };\n  }, []);\n\n  const ctx = useMemo(\n    () => ({\n      draggedCard,\n      setDraggedCard,\n      dragSource,\n      setDragSource,\n      draggedColumn,\n      setDraggedColumn,\n      onCardMove,\n      onColumnMove,\n      columnIds,\n      registerColumn,\n    }),\n    [\n      draggedCard,\n      dragSource,\n      draggedColumn,\n      onCardMove,\n      onColumnMove,\n      columnIds,\n      registerColumn,\n    ],\n  );\n\n  // ── Column-level drop handling ────────────────────────────────────────\n  // Root listens only when a column is being dragged. Drop index is\n  // computed from mouse X versus each column's horizontal midpoint.\n  const containerRef = useRef<HTMLDivElement>(null);\n\n  const handleDragOver = useCallback(\n    (e: React.DragEvent) => {\n      if (!draggedColumn) return;\n      e.preventDefault();\n    },\n    [draggedColumn],\n  );\n\n  const handleDrop = useCallback(\n    (e: React.DragEvent) => {\n      if (!draggedColumn || !containerRef.current) return;\n      e.preventDefault();\n\n      const cols = containerRef.current.querySelectorAll<HTMLElement>(\n        '[data-react-fancy-kanban-column]',\n      );\n      const x = e.clientX;\n      let dropIdx = cols.length;\n      for (let i = 0; i < cols.length; i++) {\n        const rect = cols[i]!.getBoundingClientRect();\n        if (x < rect.left + rect.width / 2) {\n          dropIdx = i;\n          break;\n        }\n      }\n\n      const sourceIdx = columnIds.indexOf(draggedColumn);\n      // When moving rightward, dropping at index N visually means landing\n      // at N - 1 after the source is removed.\n      const finalIdx =\n        sourceIdx >= 0 && dropIdx > sourceIdx ? dropIdx - 1 : dropIdx;\n\n      if (finalIdx !== sourceIdx) {\n        onColumnMove?.(draggedColumn, finalIdx);\n      }\n      setDraggedColumn(null);\n    },\n    [draggedColumn, columnIds, onColumnMove],\n  );\n\n  return (\n    <KanbanContext.Provider value={ctx}>\n      <div\n        ref={containerRef}\n        data-react-fancy-kanban=\"\"\n        onDragOver={handleDragOver}\n        onDrop={handleDrop}\n        role=\"application\"\n        aria-roledescription=\"kanban board\"\n        className={cn(\"flex gap-4 overflow-x-auto p-4\", className)}\n      >\n        {children}\n      </div>\n    </KanbanContext.Provider>\n  );\n}\n\nexport const Kanban = Object.assign(KanbanRoot, {\n  Column: KanbanColumn,\n  Card: KanbanCard,\n  ColumnHandle: KanbanColumnHandle,\n});\n"]}