"use client";

import { ReactNode, useCallback } from "react";
import { Node, NodeResizer, OnResize, useReactFlow } from "@xyflow/react";
import { useWorkflowStore } from "@/store/workflowStore";
import { getMediaDimensions, calculateAspectFitSize } from "@/utils/nodeDimensions";

const DEFAULT_NODE_DIMENSION = 300;

interface BaseNodeProps {
  id: string;
  children: ReactNode;
  selected?: boolean;
  isExecuting?: boolean;
  hasError?: boolean;
  className?: string;
  contentClassName?: string;
  minWidth?: number;
  minHeight?: number;
  /** When true, node has no background/border — content fills the entire node area */
  fullBleed?: boolean;
  /** Media URL (image/video) to use for aspect-fit resize on resize-handle double-click */
  aspectFitMedia?: string | null;
  /** When true, bottom corners lose rounding so the selection ring connects to the settings panel below */
  settingsExpanded?: boolean;
}

/**
 * Read a node's effective width or height, respecting React Flow's internal
 * priority: node.width > node.style.width > node.measured.width.
 */
function getNodeDimension(node: Node, axis: "width" | "height"): number {
  return (
    (node[axis] as number) ??
    (node.style?.[axis] as number) ??
    (node.measured?.[axis] as number) ??
    DEFAULT_NODE_DIMENSION
  );
}

/**
 * Apply dimensions to a React Flow node, writing to both `node.width/height`
 * (where NodeResizer writes) and `node.style` (the original source) so neither
 * silently overrides the other.
 */
function applyNodeDimensions(node: Node, width: number, height: number): Node {
  return {
    ...node,
    width,
    height,
    style: { ...node.style, width, height },
  };
}

export function BaseNode({
  id,
  children,
  selected = false,
  isExecuting = false,
  hasError = false,
  className = "",
  contentClassName,
  minWidth = 180,
  minHeight = 100,
  fullBleed = false,
  aspectFitMedia,
  settingsExpanded = false,
}: BaseNodeProps) {
  const currentNodeIds = useWorkflowStore((state) => state.currentNodeIds);
  const setHoveredNodeId = useWorkflowStore((state) => state.setHoveredNodeId);
  const isCurrentlyExecuting = currentNodeIds.includes(id);
  const { getNodes, setNodes } = useReactFlow();

  const handleResize: OnResize = useCallback(
    (_event, params) => {
      setNodes((nodes) =>
        nodes.map((node) => {
          if (node.selected && node.id !== id) {
            return applyNodeDimensions(node, params.width, params.height);
          }
          return node;
        })
      );
    },
    [id, setNodes]
  );

  const handleResizeHandleDblClick = useCallback(
    async (e: React.MouseEvent) => {
      const target = e.target as HTMLElement;
      if (!target.closest(".react-flow__resize-control")) return;
      if (!aspectFitMedia) return;

      e.stopPropagation();
      const dims = await getMediaDimensions(aspectFitMedia);
      if (!dims) return;

      const thisNode = getNodes().find((n) => n.id === id);
      if (!thisNode) return;

      const newSize = calculateAspectFitSize(
        dims.width / dims.height,
        getNodeDimension(thisNode, "width"),
        getNodeDimension(thisNode, "height"),
        fullBleed
      );

      setNodes((nds) =>
        nds.map((n) => {
          if (n.id === id || (n.selected && n.id !== id)) {
            return applyNodeDimensions(n, newSize.width, newSize.height);
          }
          return n;
        })
      );
    },
    [aspectFitMedia, id, fullBleed, getNodes, setNodes]
  );

  return (
    <div className="contents" onDoubleClick={handleResizeHandleDblClick}>
      <NodeResizer
        isVisible={selected}
        minWidth={minWidth}
        minHeight={minHeight}
        lineClassName="!border-transparent"
        handleClassName="!w-3 !h-3 !bg-transparent !border-none"
        onResize={handleResize}
      />
      <div
        className={`
          h-full w-full flex flex-col overflow-visible
          ${fullBleed ? `${settingsExpanded && selected ? "rounded-t-lg" : "rounded-lg"} bg-neutral-800/50 border border-neutral-700/40` : "bg-neutral-800 rounded-lg shadow-lg border"}
          ${fullBleed ? "" : (isCurrentlyExecuting || isExecuting ? "border-blue-500 ring-1 ring-blue-500/20" : "border-neutral-700/60")}
          ${fullBleed ? "" : (hasError ? "border-red-500" : "")}
          ${fullBleed && selected ? "ring-2 ring-blue-500/40 shadow-lg shadow-blue-500/25" : ""}
          ${!fullBleed && selected ? "border-blue-500 ring-2 ring-blue-500/40 shadow-lg shadow-blue-500/25" : ""}
          ${className}
        `}
        onMouseEnter={() => setHoveredNodeId(id)}
        onMouseLeave={() => setHoveredNodeId(null)}
      >
        <div className={contentClassName ?? (fullBleed ? "flex-1 min-h-0 relative" : "px-3 pb-4 flex-1 min-h-0 overflow-hidden flex flex-col")}>{children}</div>
      </div>
    </div>
  );
}